@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== LIGHT MODE (Default — mengikuti tema invoice) ===== */
:root {
  --bg-dark: #f4f6fb;
  --bg-card: #ffffff;
  --bg-card2: #eef1f8;
  --bg-input: #f0f3fa;
  --border: rgba(43,39,184,0.10);
  --border-hover: rgba(43,39,184,0.25);
  --primary: #2B27B8;
  --primary-hover: #3730d4;
  --primary-glow: rgba(43,39,184,0.20);
  --accent: #3B82F6;
  --accent2: #1D4ED8;
  --green: #10B981;
  --green-bg: rgba(16,185,129,0.10);
  --blue-bg: rgba(59,130,246,0.08);
  --purple-bg: rgba(43,39,184,0.07);
  --red-bg: rgba(239,68,68,0.10);
  --text-primary: #1a1850;
  --text-secondary: #4a4a8a;
  --text-muted: #8888bb;
  --sidebar-w: 240px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(43,39,184,0.10);
  --transition: 0.2s ease;
  /* Decorative colors from invoice */
  --deco-blue: #3B82F6;
  --deco-navy: #2B27B8;
}

/* ===== DARK MODE (Playful — warna cerah anak-anak suka) ===== */
[data-theme="dark"] {
  --bg-dark: #1a0e2e;
  --bg-card: #251642;
  --bg-card2: #2e1a52;
  --bg-input: #351e60;
  --border: rgba(200,150,255,0.12);
  --border-hover: rgba(200,150,255,0.28);
  --primary: #a855f7;
  --primary-hover: #c084fc;
  --primary-glow: rgba(168,85,247,0.35);
  --accent: #60A5FA;
  --accent2: #3B82F6;
  --green: #34d399;
  --green-bg: rgba(52,211,153,0.12);
  --blue-bg: rgba(96,165,250,0.12);
  --purple-bg: rgba(168,85,247,0.12);
  --red-bg: rgba(251,113,133,0.12);
  --text-primary: #f0e8ff;
  --text-secondary: #c4a8f0;
  --text-muted: #8a70b8;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --deco-blue: #60A5FA;
  --deco-navy: #a855f7;
}

html { scroll-behavior: smooth; }
body { font-family: 'Plus Jakarta Sans', sans-serif; background: var(--bg-dark); color: var(--text-primary); min-height: 100vh; overflow-x: hidden; transition: background 0.35s ease, color 0.35s ease; }

/* ===== PAGES ===== */
.page { min-height: 100vh; }
.page.hidden { display: none !important; }
.page.active { display: block; }

/* ===== LOGIN PAGE ===== */
.login-bg { position: fixed; inset: 0; overflow: hidden; z-index: 0; }
.login-orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.30; animation: float 8s ease-in-out infinite; }
.orb-1 { width: 500px; height: 500px; background: radial-gradient(circle, var(--primary), transparent); top: -100px; left: -100px; }
.orb-2 { width: 400px; height: 400px; background: radial-gradient(circle, var(--accent), transparent); bottom: -80px; right: -80px; animation-delay: -3s; }
.orb-3 { width: 300px; height: 300px; background: radial-gradient(circle, var(--accent2), transparent); top: 50%; left: 50%; transform: translate(-50%,-50%); animation-delay: -5s; }
@keyframes float { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-20px) scale(1.05); } }

.login-container { position: relative; z-index: 1; min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px; }

.login-brand { display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }
.login-brand-centered { justify-content: center; }
.login-logo-img { width: 150px; max-width: 30vw; height: auto; object-fit: contain; filter: drop-shadow(0 4px 20px rgba(59, 130, 246, 0.3)); }
.sidebar-logo { width: 100%; height: auto; object-fit: contain; }
.brand-icon { width: 48px; height: 48px; background: var(--bg-card2); border: 1.5px solid var(--border); border-radius: 14px; display: grid; place-items: center; box-shadow: var(--shadow); }
.brand-icon-sm { width: 36px; height: 36px; border-radius: 10px; }
.brand-name { font-size: 28px; font-weight: 800; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; filter: drop-shadow(0 2px 8px rgba(59, 130, 246, 0.15)); }

.login-card { background: var(--bg-card); backdrop-filter: blur(20px); border: 1px solid var(--border); border-radius: 24px; padding: 40px; width: 100%; max-width: 440px; box-shadow: var(--shadow); transition: background 0.35s ease, border-color 0.35s ease; }
.login-title { font-size: 26px; font-weight: 800; margin-bottom: 6px; }
.login-subtitle { color: var(--text-secondary); margin-bottom: 28px; font-size: 15px; }

.alert-error { background: rgba(255,107,107,0.12); border: 1px solid rgba(255,107,107,0.3); color: #ff9090; border-radius: var(--radius-sm); padding: 12px 16px; display: flex; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 14px; }
.alert-error.hidden { display: none; }

.login-form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.input-wrapper { position: relative; }
.input-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); pointer-events: none; }
.input-wrapper input { width: 100%; padding: 13px 14px 13px 44px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-primary); font-size: 15px; font-family: inherit; transition: var(--transition); outline: none; }
.input-wrapper input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
input, select, textarea { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-primary); font-size: 14px; font-family: inherit; padding: 11px 14px; width: 100%; transition: var(--transition); outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-glow); }
select option { background: var(--bg-card2); }
textarea { resize: vertical; }

.demo-accounts { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); }
.demo-title { font-size: 12px; color: var(--text-muted); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.08em; }
.demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.demo-btn { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 14px; cursor: pointer; text-align: left; transition: var(--transition); }
.demo-btn:hover { border-color: var(--primary); background: var(--purple-bg); }
.demo-role { display: block; font-size: 11px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 0.05em; }
.demo-email { display: block; font-size: 12px; color: var(--text-secondary); margin-top: 2px; }

/* ===== BUTTONS ===== */
.btn-primary { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 22px; background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; border: none; border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; font-family: inherit; cursor: pointer; transition: all var(--transition); box-shadow: 0 4px 15px var(--primary-glow); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 25px var(--primary-glow); filter: brightness(1.1); }
.btn-primary:active { transform: translateY(0); }
.btn-full { width: 100%; }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; padding: 11px 20px; background: var(--bg-input); color: var(--text-primary); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; font-family: inherit; cursor: pointer; transition: var(--transition); }
.btn-secondary:hover { border-color: var(--border-hover); background: var(--bg-card2); }
.btn-add { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; border: none; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; font-family: inherit; cursor: pointer; transition: var(--transition); }
.btn-add:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--primary-glow); }

/* ===== LAYOUT ===== */
#teacherPage, #studentPage { display: flex; min-height: 100vh; }
#teacherPage.hidden, #studentPage.hidden { display: none !important; }

/* ===== SIDEBAR ===== */
.sidebar { width: var(--sidebar-w); background: var(--bg-card); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; height: 100vh; z-index: 100; transition: transform 0.3s ease, background 0.35s ease, border-color 0.35s ease; }
.sidebar-brand { display: flex; align-items: center; gap: 10px; padding: 22px 20px; font-size: 18px; font-weight: 800; border-bottom: 1px solid var(--border); background: linear-gradient(135deg, #FBBF24, #F97316); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-brand .brand-icon-sm { flex-shrink: 0; }
.sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; }
.nav-item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; background: none; border: none; border-radius: var(--radius-sm); color: var(--text-secondary); font-size: 14px; font-weight: 500; font-family: inherit; cursor: pointer; transition: var(--transition); width: 100%; text-align: left; }
.nav-item:hover { background: var(--purple-bg); color: var(--text-primary); }
.nav-item.active { background: var(--purple-bg); color: var(--primary); font-weight: 600; }
.nav-item.active svg { color: var(--primary); }
.sidebar-footer { padding: 16px 12px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.user-info { padding: 10px 12px; background: var(--bg-input); border-radius: var(--radius-sm); }
.user-info .user-name { font-size: 14px; font-weight: 600; display: block; }
.user-info .user-role { font-size: 12px; color: var(--text-muted); display: block; margin-top: 2px; }

/* Sidebar Settings (Language Selector) */
.sidebar-setting { padding: 8px 12px; background: var(--bg-input); border-radius: var(--radius-sm); }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.setting-label { font-size: 13px; font-weight: 500; color: var(--text-secondary); }
.setting-select {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  min-width: 100px;
}
.setting-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.2);
}

.btn-logout { display: flex; align-items: center; gap: 8px; padding: 10px 14px; background: rgba(255,107,107,0.08); border: 1px solid rgba(255,107,107,0.2); border-radius: var(--radius-sm); color: #ff9090; font-size: 13px; font-weight: 500; font-family: inherit; cursor: pointer; transition: var(--transition); width: 100%; }
.btn-logout:hover { background: rgba(255,107,107,0.15); }

/* ===== MAIN CONTENT ===== */
.main-content { margin-left: var(--sidebar-w); flex: 1; padding: 32px; min-height: 100vh; }
.content-section { display: none; scroll-margin-top: 88px; }
.content-section.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.section-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 28px; flex-wrap: wrap; gap: 16px; }
.section-title { font-size: 24px; font-weight: 800; }
.section-subtitle { color: var(--text-secondary); font-size: 14px; margin-top: 4px; }
.section-subheader { display: flex; align-items: center; justify-content: space-between; margin: 28px 0 16px; }
.section-subheader h3 { font-size: 16px; font-weight: 700; }

/* ===== STATS ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stats-grid-3 { grid-template-columns: repeat(3, 1fr); }
.stats-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 768px) {
  .stats-grid, .stats-grid-3, .stats-grid-4 { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-card { padding: 16px; flex-direction: column; text-align: center; }
  .stat-value { font-size: 22px; }
  .stat-icon { font-size: 24px; }
}
@media (max-width: 480px) {
  .stats-grid, .stats-grid-3, .stats-grid-4 { grid-template-columns: 1fr; }
  .stat-card { padding: 14px 16px; flex-direction: row; text-align: left; gap: 14px; }
  .stat-value { font-size: 20px; }
  .stat-label { font-size: 12px; }
}
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; align-items: center; gap: 18px; transition: var(--transition); }
.stat-card:hover { border-color: var(--border-hover); transform: translateY(-2px); }
.stat-card-blue { border-left: 3px solid var(--accent); }
.stat-card-purple { border-left: 3px solid var(--primary); }
.stat-card-green { border-left: 3px solid var(--green); }
.stat-icon { font-size: 28px; }
.stat-value { font-size: 28px; font-weight: 800; display: block; line-height: 1; }
.stat-label { font-size: 13px; color: var(--text-secondary); display: block; margin-top: 4px; }

/* ===== STUDENT DASHBOARD NEW DESIGN ===== */
.dashboard-header { margin-bottom: 32px; }
.greeting-section { }
.greeting-title { font-size: 32px; font-weight: 800; margin-bottom: 8px; line-height: 1.2; }
.greeting-subtitle { font-size: 15px; color: var(--text-secondary); font-weight: 500; }

.stats-container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 40px; }

/* Credit stats container - 3 columns to match package grid */
.credit-stats-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
  max-width: 100%;
}

.stat-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; display: flex; align-items: center; justify-content: space-between; transition: var(--transition); position: relative; overflow: hidden; }
.stat-box:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--border-hover); }
.stat-box::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; border-radius: var(--radius) var(--radius) 0 0; }
.stat-box.stat-primary::before { background: linear-gradient(90deg, var(--primary), var(--accent)); }
.stat-box.stat-info::before { background: linear-gradient(90deg, var(--accent), #60A5FA); }
.stat-box.stat-success::before { background: linear-gradient(90deg, var(--green), #34d399); }
.stat-box.stat-warning::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.stat-content { display: flex; flex-direction: column; gap: 8px; }
.stat-box .stat-label { font-size: 13px; color: var(--text-secondary); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-box .stat-value { font-size: 36px; font-weight: 800; line-height: 1; color: var(--text-primary); }
.stat-icon-circle { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 28px; background: var(--bg-card2); flex-shrink: 0; }
.stat-box.stat-primary .stat-icon-circle { background: var(--purple-bg); }
.stat-box.stat-info .stat-icon-circle { background: var(--blue-bg); }
.stat-box.stat-success .stat-icon-circle { background: var(--green-bg); }
.stat-box.stat-warning .stat-icon-circle { background: rgba(251, 191, 36, 0.1); }

.schedule-section { margin-bottom: 32px; }
.section-title-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--border); }
.section-title-text { font-size: 20px; font-weight: 700; color: var(--text-primary); margin: 0; }
.schedule-list { display: flex; flex-direction: column; gap: 14px; }

@media (max-width: 1200px) {
  .stats-container { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}

@media (max-width: 768px) {
  .greeting-title { font-size: 26px; }
  .greeting-subtitle { font-size: 14px; }
  .stats-container { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-box { padding: 18px; }
  .stat-box .stat-value { font-size: 28px; }
  .stat-box .stat-label { font-size: 11px; }
  .stat-icon-circle { width: 48px; height: 48px; font-size: 24px; }
  .section-title-text { font-size: 18px; }
}

@media (max-width: 480px) {
  .greeting-title { font-size: 22px; }
  .stats-container { grid-template-columns: 1fr; gap: 10px; }
  .stat-box { padding: 16px; }
  .stat-box .stat-value { font-size: 24px; }
  .stat-icon-circle { width: 44px; height: 44px; font-size: 22px; }
  .section-title-text { font-size: 16px; }
}

/* ===== CLASS CARDS ===== */
.class-list { display: flex; flex-direction: column; gap: 14px; }
.class-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; display: flex; align-items: center; gap: 18px; transition: var(--transition); cursor: pointer; }
.class-card:hover { border-color: var(--border-hover); transform: translateY(-2px); box-shadow: var(--shadow); }
.class-card-left { flex: 1; min-width: 0; }
.class-card-title { font-size: 16px; font-weight: 700; margin-bottom: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.class-card-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.meta-item { display: flex; align-items: center; gap: 5px; font-size: 13px; color: var(--text-secondary); }
.meta-item svg { flex-shrink: 0; }
.class-card-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.class-card-actions { display: flex; gap: 8px; }

/* Mobile responsive for class cards */
@media (max-width: 600px) {
  .class-list { gap: 10px; }
  .class-card { padding: 14px 16px; gap: 12px; flex-direction: column; align-items: stretch; }
  .class-card-left { width: 100%; }
  .class-card-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; white-space: normal; overflow: visible; text-overflow: unset; }
  .class-card-meta { gap: 6px; }
  .meta-item { font-size: 11px; gap: 3px; }
  .class-card-right {
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    gap: 8px;
  }
  .class-card-actions { gap: 6px; }
  .btn-icon { width: 30px; height: 30px; }
  .btn-join, .btn-secondary { padding: 6px 12px; font-size: 12px; }
  .badge { padding: 3px 8px; font-size: 11px; }
  .next-class-card { padding: 16px; }
  .next-class-title { font-size: 16px; }
  .next-class-time { font-size: 13px; }
}

/* Extra small mobile */
@media (max-width: 400px) {
  .class-card { padding: 12px; }
  .class-card-title { font-size: 13px; }
  .meta-item { font-size: 10px; }
  .btn-join, .btn-secondary { padding: 5px 10px; font-size: 11px; }
  .badge { padding: 2px 6px; font-size: 10px; }
}

/* ===== STATUS BADGES ===== */
.badge { display: inline-flex; align-items: center; gap: 5px; padding: 4px 10px; border-radius: 100px; font-size: 12px; font-weight: 600; }
.badge-scheduled { background: var(--blue-bg); color: var(--accent); border: 1px solid rgba(0,212,255,0.2); }
.badge-completed { background: var(--green-bg); color: var(--green); border: 1px solid rgba(0,229,160,0.2); }
.badge-cancelled { background: var(--red-bg); color: #ff9090; border: 1px solid rgba(255,107,107,0.2); }
.badge::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* ===== ACTION BUTTONS in cards ===== */
.btn-icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-input); color: var(--text-secondary); cursor: pointer; transition: var(--transition); font-family: inherit; }
.btn-icon:hover { border-color: var(--primary); color: var(--primary); background: var(--purple-bg); }
.btn-icon.danger:hover { border-color: rgba(255,107,107,0.4); color: #ff9090; background: var(--red-bg); }

/* ===== FILTER BAR ===== */
.filter-bar { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.filter-btn { padding: 8px 16px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 100px; color: var(--text-secondary); font-size: 13px; font-weight: 500; font-family: inherit; cursor: pointer; transition: var(--transition); }
.filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.filter-btn.active { background: var(--purple-bg); border-color: var(--primary); color: var(--primary); font-weight: 600; }

/* ===== STUDENTS GRID ===== */
.students-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.student-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; transition: var(--transition); }
.student-card:hover { border-color: var(--border-hover); transform: translateY(-2px); }
.student-avatar { width: 48px; height: 48px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); display: grid; place-items: center; font-size: 20px; margin-bottom: 14px; }
.student-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.student-email { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.student-detail { font-size: 13px; color: var(--text-secondary); display: flex; gap: 6px; margin-top: 6px; }
.student-detail strong { color: var(--text-primary); }

/* ===== NEXT CLASS CARD (Student) ===== */
.next-class-card { background: linear-gradient(135deg, var(--purple-bg), var(--blue-bg)); border: 1px solid var(--border-hover); border-radius: var(--radius); padding: 28px; position: relative; overflow: hidden; }
.next-class-card::before { content: ''; position: absolute; top: -50%; right: -20%; width: 300px; height: 300px; background: radial-gradient(circle, var(--primary-glow), transparent); border-radius: 50%; pointer-events: none; }
.next-class-label { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--primary); margin-bottom: 12px; }
.next-class-title { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.next-class-time { font-size: 15px; color: var(--text-secondary); margin-bottom: 16px; display: flex; align-items: center; gap: 6px; }
.next-class-actions { display: flex; align-items: center; gap: 16px; margin-top: 16px; }
.btn-join { display: inline-flex; align-items: center; gap: 10px; padding: 13px 24px; background: linear-gradient(135deg, var(--green), var(--accent)); color: #fff; border: none; border-radius: var(--radius-sm); font-size: 15px; font-weight: 700; font-family: inherit; cursor: pointer; transition: all var(--transition); box-shadow: 0 4px 20px rgba(16,185,129,0.3); }
.btn-join:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(16,185,129,0.4); }
.btn-join-disabled { display: inline-flex; align-items: center; gap: 10px; padding: 13px 24px; background: var(--bg-input); border: 1px solid var(--border); color: var(--text-muted); border-radius: var(--radius-sm); font-size: 15px; font-weight: 600; font-family: inherit; cursor: not-allowed; }
.join-countdown { font-size: 13px; color: var(--text-muted); margin-top: 10px; }

.countdown-box { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 20px; display: flex; flex-direction: column; align-items: center; gap: 8px; min-width: 200px; }
.countdown-label { font-size: 12px; color: var(--text-secondary); font-weight: 600; text-align: center; }
.countdown-time { font-size: 20px; font-weight: 800; color: var(--primary); text-align: center; font-family: monospace; }

@media (max-width: 600px) {
  .next-class-actions { flex-direction: column; align-items: stretch; gap: 12px; }
  .countdown-box { width: 100%; min-width: auto; }
}

/* ===== CLASSES TABLE ===== */
.classes-table-container { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.classes-table { width: 100%; border-collapse: collapse; }
.classes-table thead tr { background: var(--bg-card2); }
.classes-table th { padding: 16px 20px; text-align: left; font-size: 12px; font-weight: 700; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.8px; border-bottom: 2px solid var(--border); }
.classes-table tbody tr { border-bottom: 1px solid var(--border); transition: var(--transition); cursor: pointer; }
.classes-table tbody tr:hover { background: var(--purple-bg); }
.classes-table tbody tr:last-child { border-bottom: none; }
.classes-table td { padding: 20px; vertical-align: middle; }

@media (max-width: 768px) {
  .classes-table-container { overflow-x: auto; }
  .classes-table { min-width: 600px; }
  .classes-table th, .classes-table td { padding: 12px 16px; font-size: 13px; }
}

/* ===== QUIZ STYLES ===== */
.quiz-option { display: flex; align-items: center; gap: 12px; padding: 16px; background: var(--bg-card); border: 2px solid var(--border); border-radius: var(--radius); cursor: pointer; transition: var(--transition); }
.quiz-option:hover { border-color: var(--primary); background: var(--purple-bg); }
.quiz-option input[type="radio"] { width: 20px; height: 20px; cursor: pointer; }
.quiz-option input[type="radio"]:checked + span { font-weight: 700; color: var(--primary); }
.quiz-option span { flex: 1; font-size: 15px; }

.quiz-review-item { padding: 16px; background: var(--bg-card); border: 2px solid var(--border); border-radius: var(--radius); margin-bottom: 12px; }
.quiz-review-item.correct { border-color: var(--green); background: var(--green-bg); }
.quiz-review-item.incorrect { border-color: #ff9090; background: var(--red-bg); }
.quiz-review-question { font-size: 15px; font-weight: 700; margin-bottom: 8px; color: var(--text-primary); }
.quiz-review-answer { font-size: 14px; color: var(--text-secondary); margin-bottom: 4px; }
.quiz-review-correct { font-size: 14px; color: var(--green); font-weight: 600; }
.quiz-history-list { display: grid; gap: 12px; }
.quiz-history-card { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.quiz-history-title { font-weight: 700; color: var(--text-primary); }
.quiz-history-meta { margin-top: 6px; font-size: 13px; color: var(--text-secondary); }
.quiz-history-actions { display: flex; align-items: center; gap: 14px; color: var(--primary); }
@media (max-width: 600px) { .quiz-history-card, .quiz-history-actions { align-items: stretch; flex-direction: column; } }

/* ===== MATERIALS (Student & Teacher) ===== */
.materials-filters { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.materials-course-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.course-tab { padding: 9px 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 100px; font-size: 13px; font-weight: 600; font-family: inherit; color: var(--text-secondary); cursor: pointer; transition: var(--transition); }
.course-tab:hover { border-color: var(--border-hover); color: var(--text-primary); }
.course-tab.active { background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; border-color: transparent; box-shadow: 0 4px 14px var(--primary-glow); }
.materials-level-select { padding: 9px 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); font-family: inherit; font-size: 13px; font-weight: 600; color: var(--text-primary); cursor: pointer; outline: none; }
.materials-level-select:focus { border-color: var(--primary); }

.materials-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.material-card { display: flex; flex-direction: column; gap: 10px; padding: 18px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); cursor: pointer; transition: var(--transition); position: relative; overflow: hidden; }
.material-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: 0; transition: var(--transition); }
.material-card:hover { transform: translateY(-3px); border-color: var(--border-hover); box-shadow: 0 10px 28px var(--primary-glow); }
.material-card:hover::before { opacity: 1; }
.material-card-top { display: flex; align-items: center; justify-content: space-between; }
.material-card-icon { width: 42px; height: 42px; display: grid; place-items: center; font-size: 22px; background: var(--purple-bg); border-radius: 12px; }
.material-level-badge { padding: 4px 10px; border-radius: 100px; font-size: 11px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; }
.material-level-badge.level-basic { background: var(--green-bg); color: var(--green); }
.material-level-badge.level-intermediate { background: rgba(245, 158, 11, 0.12); color: #f59e0b; }
.material-level-badge.level-advanced { background: var(--red-bg); color: #ef4444; }
.material-level-badge.level-gui { background: var(--purple-bg); color: var(--primary); }
.material-level-badge.level-flask { background: rgba(16, 185, 129, 0.12); color: #059669; }
.material-level-badge.level-automation { background: rgba(59, 130, 246, 0.12); color: var(--accent2); }
.material-level-badge.level-machine-learning { background: rgba(168, 85, 247, 0.14); color: #a855f7; }
.material-card-title { font-size: 15px; font-weight: 700; color: var(--text-primary); line-height: 1.4; }
.material-card-meta { display: flex; gap: 12px; flex-wrap: wrap; font-size: 12px; color: var(--text-muted); }
.material-card-class { font-size: 12px; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.material-card-btn { width: 100%; padding: 9px 14px; font-size: 13px; justify-content: center; display: inline-flex; align-items: center; border: none; border-radius: var(--radius-sm); background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; font-family: inherit; font-weight: 700; cursor: pointer; transition: var(--transition); }
.material-card:hover .material-card-btn { filter: brightness(1.1); }

/* Assigned material rows (teacher modal & student detail) */
.assigned-material-row { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-top: 8px; cursor: pointer; transition: var(--transition); }
.assigned-material-row:hover { border-color: var(--border-hover); background: var(--purple-bg); }
.assigned-material-info { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; }
.assigned-material-title { font-size: 13.5px; font-weight: 600; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.assigned-material-empty { padding: 12px; text-align: center; font-size: 13px; color: var(--text-muted); font-style: italic; }
.btn-assign-material { padding: 6px 14px; font-size: 12px; font-weight: 700; font-family: inherit; border: none; border-radius: 100px; background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.btn-assign-material:hover { filter: brightness(1.1); transform: translateY(-1px); }

/* PPTX button — orange slide theme */
.btn-pptx { display: inline-flex; align-items: center; gap: 5px; padding: 5px 12px; font-size: 12px; font-weight: 700; font-family: inherit; border: 1px solid rgba(217, 72, 15, 0.35); border-radius: 100px; background: rgba(249, 115, 22, 0.10); color: #ea580c; text-decoration: none; cursor: pointer; transition: var(--transition); white-space: nowrap; }
.btn-pptx:hover { background: #ea580c; color: white; border-color: #ea580c; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(234, 88, 12, 0.3); }
.material-card-btn.btn-pptx { justify-content: center; display: inline-flex; width: 100%; margin-top: 8px; }

/* Assign modal */
.assign-topics-list { display: flex; flex-direction: column; gap: 6px; max-height: 240px; overflow-y: auto; padding-right: 4px; }
.assign-topic-item { display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--bg-input); border: 1.5px solid var(--border); border-radius: var(--radius-sm); cursor: pointer; transition: var(--transition); }
.assign-topic-item:hover { border-color: var(--border-hover); }
.assign-topic-item.selected { border-color: var(--primary); background: var(--purple-bg); box-shadow: 0 0 0 3px var(--primary-glow); }
.assign-topic-num { width: 26px; height: 26px; flex-shrink: 0; display: grid; place-items: center; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; font-size: 11px; font-weight: 800; color: var(--primary); }
.assign-topic-item.selected .assign-topic-num { background: var(--primary); color: white; border-color: var(--primary); }
.assign-topic-name { font-size: 13.5px; font-weight: 600; color: var(--text-primary); }
.assign-topics-empty { padding: 16px; text-align: center; font-size: 13px; color: var(--text-muted); }
.assign-selected-preview { padding: 12px 14px; background: var(--green-bg); border: 1px solid var(--green); border-radius: var(--radius-sm); font-size: 13px; color: var(--text-primary); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.assign-selected-preview.hidden { display: none; }

/* ===== MATERIAL VIEWER MODAL (Markdown) ===== */
.material-viewer-modal { max-width: 860px; height: 90vh; display: flex; flex-direction: column; }
.material-viewer-header { align-items: flex-start; }
.material-viewer-header-info { min-width: 0; }
.material-viewer-header h3 { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%; }
.material-viewer-meta { margin-top: 4px; font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.material-viewer-body { flex: 1; overflow-y: auto; padding: 24px 28px; display: block; }
.material-viewer-body::-webkit-scrollbar { width: 8px; }
.material-viewer-body::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 4px; }

.md-content { font-size: 14.5px; line-height: 1.75; color: var(--text-primary); max-width: 100%; }
.md-content h1, .md-content h2.md-h1 { font-size: 22px; font-weight: 800; margin: 4px 0 14px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.md-content .md-h1 { font-size: 22px; font-weight: 800; margin: 22px 0 12px; }
.md-content .md-h2 { font-size: 18px; font-weight: 800; margin: 24px 0 10px; color: var(--primary); }
.md-content .md-h3 { font-size: 15.5px; font-weight: 700; margin: 18px 0 8px; }
.md-content .md-h4 { font-size: 14px; font-weight: 700; margin: 14px 0 6px; color: var(--text-secondary); }
.md-content p { margin: 8px 0; }
.md-content blockquote { margin: 14px 0; padding: 12px 16px; background: var(--purple-bg); border-left: 4px solid var(--primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary); font-size: 13.5px; }
.md-content blockquote strong { color: var(--primary); }
.md-content pre.md-code { margin: 14px 0; padding: 16px 18px; background: #16123a; color: #d8e0ff; border-radius: var(--radius-sm); overflow-x: auto; font-size: 13px; line-height: 1.65; border: 1px solid rgba(120, 100, 255, 0.25); }
[data-theme="dark"] .md-content pre.md-code { background: #17102e; }
.md-content pre.md-code code { font-family: 'Consolas', 'Monaco', 'Courier New', monospace; white-space: pre; }
.md-content code { font-family: 'Consolas', 'Monaco', 'Courier New', monospace; font-size: 0.88em; background: var(--purple-bg); color: var(--primary); padding: 2px 7px; border-radius: 6px; font-weight: 600; }
.md-content pre.md-code code { background: none; color: inherit; padding: 0; }
.md-content table { width: 100%; margin: 14px 0; border-collapse: collapse; font-size: 13.5px; background: var(--bg-card); border-radius: var(--radius-sm); overflow: hidden; box-shadow: 0 2px 10px rgba(0,0,0,0.06); }
.md-content th { background: var(--purple-bg); color: var(--primary); font-weight: 700; text-align: left; }
.md-content th, .md-content td { padding: 10px 14px; border: 1px solid var(--border); }
.md-content tr:hover td { background: var(--bg-card2); }
.md-content ul, .md-content ol { margin: 8px 0; padding-left: 24px; }
.md-content li { margin: 5px 0; }
.md-content ul.md-checklist { list-style: none; padding-left: 4px; }
.md-content ul.md-checklist li { display: flex; gap: 8px; align-items: baseline; }
.md-check { font-size: 15px; }
.md-check.done { color: var(--green); }
.md-content hr { border: none; border-top: 2px dashed var(--border); margin: 20px 0; }
.md-content a { color: var(--accent); font-weight: 600; text-decoration: none; border-bottom: 1px dashed var(--accent); }
.md-content a:hover { opacity: 0.8; }
.md-content strong { color: var(--primary); font-weight: 700; }
.md-content .md-img { display: block; max-width: 100%; width: 100%; max-height: 340px; object-fit: contain; margin: 14px auto; border-radius: var(--radius-sm); background: white; padding: 10px; border: 1px solid var(--border); box-shadow: 0 4px 18px rgba(43,39,184,0.10); transition: transform 0.2s ease, box-shadow 0.2s ease; }
.md-content .md-img:hover { transform: scale(1.015); box-shadow: 0 8px 26px rgba(43,39,184,0.18); }
.md-content .md-tip { margin: 14px 0; padding: 12px 16px; background: var(--blue-bg); border: 1px dashed var(--accent); border-radius: var(--radius-sm); font-size: 13.5px; color: var(--text-secondary); }

/* ===== MODALS ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 20px; animation: fadeIn 0.2s ease; }
.modal-overlay.hidden { display: none !important; }
.modal { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.6); }
.modal-lg { max-width: 640px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 22px 24px; border-bottom: 1px solid var(--border); }
.modal-header h3 { font-size: 18px; font-weight: 700; }
.modal-close { width: 32px; height: 32px; display: grid; place-items: center; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; cursor: pointer; color: var(--text-secondary); font-size: 14px; transition: var(--transition); }
.modal-close:hover { background: var(--red-bg); color: #ff9090; border-color: rgba(255,107,107,0.3); }
.modal-body { padding: 24px; display: flex; flex-direction: column; gap: 18px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; padding-top: 8px; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 14px; }

/* ===== SUMMARY DISPLAY ===== */
.summary-block { background: var(--bg-card2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; }
.summary-block-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--primary); margin-bottom: 8px; }
.summary-block-content { font-size: 14px; color: var(--text-secondary); line-height: 1.7; white-space: pre-wrap; }
.progress-badge { display: inline-flex; align-items: center; padding: 6px 14px; background: var(--green-bg); border: 1px solid rgba(0,229,160,0.2); color: var(--green); border-radius: 100px; font-size: 13px; font-weight: 600; }

/* ===== TOPBAR (mobile) ===== */
.topbar { display: none; position: fixed; top: 0; left: 0; right: 0; height: 58px; background: var(--bg-card); border-bottom: 1px solid var(--border); z-index: 99; align-items: center; gap: 12px; padding: 0 18px; transition: background 0.35s ease; }
.topbar-title { font-size: 16px; font-weight: 800; background: linear-gradient(135deg, #FBBF24, #F97316); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hamburger { background: none; border: none; cursor: pointer; color: var(--text-primary); display: grid; place-items: center; }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 99; }

/* ===== EMPTY STATE ===== */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h4 { font-size: 16px; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* ===== TOAST ===== */
.toast { position: fixed; bottom: 24px; right: 24px; background: var(--bg-card2); border: 1px solid var(--border); color: var(--text-primary); padding: 14px 20px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; box-shadow: var(--shadow); z-index: 9999; animation: slideUp 0.3s ease; max-width: 320px; }
.toast.hidden { display: none; }
.toast.success { border-color: rgba(0,229,160,0.3); color: var(--green); }
.toast.error { border-color: rgba(255,107,107,0.3); color: #ff9090; }
@keyframes slideUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ===== LOADING ===== */
.loading { display: flex; align-items: center; justify-content: center; gap: 10px; padding: 40px; color: var(--text-muted); font-size: 14px; }
.spinner { width: 20px; height: 20px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== RESPONSIVE ===== */
/* Mobile Sidebar Overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.show {
  opacity: 1;
}

/* Mobile Sidebar Close Button */
.sidebar-close {
  display: none;
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--bg-input);
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 10;
}

.sidebar-close:hover {
  background: var(--red-bg);
  color: #ff9090;
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 4px 0 24px rgba(0,0,0,0.5); }
  .sidebar-overlay { display: block; }
  .sidebar-overlay:not(.show) { pointer-events: none; }
  .sidebar-close { display: flex; }
  .topbar { display: flex; }
  .main-content { margin-left: 0; padding: 80px 16px 24px; }
  .stats-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .class-card { flex-direction: column; align-items: flex-start; }
  .class-card-right { flex-direction: row; align-items: center; width: 100%; justify-content: space-between; }
}
@media (min-width: 769px) {
  .topbar { display: none !important; }
}

/* ===== CHAT & EXTRA LAYOUT ===== */
.modal-xl { max-width: 900px; }
.modal-flex-layout { display: flex; gap: 24px; min-height: 480px; align-items: stretch; }
.modal-flex-col-left { flex: 1.2; display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.modal-flex-col-right { flex: 1; display: flex; flex-direction: column; border-left: 1px solid var(--border); padding-left: 24px; min-width: 0; }

.chat-container { display: flex; flex-direction: column; height: 100%; min-height: 380px; }
.chat-title { font-size: 14px; font-weight: 700; color: var(--text-secondary); margin-bottom: 8px; display: flex; align-items: center; gap: 6px; }
.chat-messages { flex: 1; overflow-y: auto; max-height: 320px; padding: 12px; background: rgba(0,0,0,0.18); border-radius: var(--radius-sm); border: 1px solid var(--border); display: flex; flex-direction: column; gap: 12px; margin-bottom: 12px; min-height: 280px; }
.chat-message { display: flex; flex-direction: column; max-width: 80%; padding: 10px 14px; border-radius: 14px; font-size: 13px; line-height: 1.4; position: relative; }
.chat-message.self { align-self: flex-end; background: linear-gradient(135deg, var(--primary), var(--primary-hover)); color: white; border-bottom-right-radius: 2px; }
.chat-message.other { align-self: flex-start; background: var(--bg-card2); color: var(--text-primary); border: 1px solid var(--border); border-bottom-left-radius: 2px; }
.chat-message-sender { font-size: 10px; font-weight: 700; color: var(--accent); margin-bottom: 3px; }
.chat-message.self .chat-message-sender { color: var(--deco-yellow); }
.chat-message-text { word-break: break-word; }
.chat-message-meta { font-size: 9px; color: rgba(255,255,255,0.6); margin-top: 5px; align-self: flex-end; }
.chat-message.other .chat-message-meta { color: var(--text-muted); }
.chat-input-row { display: flex; gap: 8px; }
.chat-input-row input { flex: 1; }
.chat-input-row button { padding: 10px 16px; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; }

@media (max-width: 768px) {
  .modal-flex-layout { flex-direction: column; }
  .modal-flex-col-right { border-left: none; padding-left: 0; border-top: 1px solid var(--border); padding-top: 20px; }
}

/* ===== ZOOM SUMMARY AUTOFILL PANEL ===== */
.zoom-import-details {
  background: var(--bg-card2);
  border: 1px dashed var(--accent);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}
.zoom-import-details[open] {
  border-style: solid;
  border-color: var(--accent);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.1);
}
.zoom-import-summary {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  list-style: none; /* Hide default triangle */
  display: flex;
  align-items: center;
  gap: 8px;
}
.zoom-import-summary::-webkit-details-marker {
  display: none; /* Hide default triangle in Safari */
}
.zoom-import-summary::before {
  content: '▶';
  font-size: 10px;
  transition: transform 0.2s ease;
  display: inline-block;
}
.zoom-import-details[open] .zoom-import-summary::before {
  transform: rotate(90deg);
}
.zoom-import-content {
  padding: 0 16px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.zoom-import-content p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.zoom-import-content textarea {
  background: var(--bg-dark);
  font-family: inherit;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--text-primary);
  width: 100%;
  resize: vertical;
}
.zoom-import-content textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(240,180,41,0.25);
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--blue-bg);
}
.theme-toggle-btn .toggle-icon {
  font-size: 16px;
  transition: transform 0.4s ease;
}
.theme-toggle-btn:hover .toggle-icon {
  transform: rotate(20deg) scale(1.2);
}

/* Light mode specific tweaks */
:root .stat-card { box-shadow: 0 2px 12px rgba(43,39,184,0.07); }
:root .modal { box-shadow: 0 20px 60px rgba(43,39,184,0.12); }
:root .login-card { box-shadow: 0 20px 60px rgba(43,39,184,0.13); }

/* Transition all card/bg elements for smooth theme switch */
.sidebar, .main-content, .stat-card, .class-card, .student-card,
.modal, .toast, .topbar, .btn-secondary, .btn-icon,
.chat-messages, .summary-block, .zoom-import-details {
  transition: background 0.35s ease, border-color 0.35s ease, color 0.35s ease, box-shadow 0.35s ease;
}

/* ===== DASHBOARD 2-COLUMN LAYOUT ===== */
.dashboard-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.dashboard-main {
  flex: 1;
  min-width: 0;
}
.dashboard-sidebar {
  width: 320px;
  flex-shrink: 0;
  position: sticky;
  top: 24px;
}

/* ===== CALENDAR WIDGET (Compact) ===== */
.calendar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  transition: background 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.calendar-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}
.calendar-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.calendar-nav-btn {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 0.2s ease;
}
.calendar-nav-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: scale(1.08);
}
.calendar-month-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  min-width: 110px;
  text-align: center;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}
.calendar-day-header {
  text-align: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding: 4px 0;
}
.calendar-day {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1.5px solid transparent;
  gap: 2px;
}
.calendar-day:hover {
  background: var(--bg-input);
  transform: scale(1.1);
}
.calendar-day.today {
  background: var(--blue-bg);
  color: var(--primary);
  font-weight: 700;
  border-color: var(--primary);
}
.calendar-day.has-class {
  font-weight: 700;
  color: var(--text-primary);
}
.calendar-day.selected {
  background: var(--primary);
  color: #fff !important;
  border-color: var(--primary);
  box-shadow: 0 3px 10px var(--primary-glow);
  transform: scale(1.1);
}
.calendar-day.selected .calendar-dot {
  background: rgba(255,255,255,0.85) !important;
}
.calendar-day.other-month {
  opacity: 0.3;
  pointer-events: none;
}
.calendar-day-num {
  font-size: 12px;
  line-height: 1;
}
.calendar-dots {
  display: flex;
  gap: 2px;
  min-height: 5px;
}
.calendar-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}
.calendar-dot.completed { background: var(--green); }
.calendar-dot.cancelled { background: var(--accent2); }

/* Calendar Detail Panel */
.calendar-detail-panel {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  animation: calSlideDown 0.3s ease;
}
.calendar-detail-panel.hidden { display: none; }
@keyframes calSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.calendar-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
}
.calendar-detail-close {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 12px;
  transition: all 0.2s ease;
}
.calendar-detail-close:hover {
  background: rgba(239,68,68,0.12);
  color: #ef4444;
  border-color: rgba(239,68,68,0.3);
}
.calendar-detail-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 240px;
  overflow-y: auto;
}
.calendar-detail-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
}
.calendar-detail-item:hover {
  border-color: var(--primary);
  background: var(--blue-bg);
  transform: translateX(3px);
}
.calendar-detail-time {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  min-width: 0;
  white-space: nowrap;
}
.calendar-detail-info {
  flex: 1;
  min-width: 0;
}
.calendar-detail-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.calendar-detail-student {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 1px;
}
.calendar-detail-badge {
  flex-shrink: 0;
}
.calendar-detail-badge .badge {
  font-size: 10px;
  padding: 2px 6px;
}

/* ===== CREDIT & TOP-UP PACKAGES ===== */
.topup-packages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.topup-package-card {
  background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg) 100%);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.topup-package-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.topup-package-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.04);
  border-color: var(--primary);
}

.topup-package-card:hover::before {
  opacity: 1;
}

.topup-package-card.package-popular {
  background: linear-gradient(135deg, rgba(43, 39, 184, 0.05) 0%, var(--card-bg) 100%);
  border-color: var(--primary);
  border-width: 3px;
  box-shadow: 0 4px 20px rgba(43, 39, 184, 0.2);
  transform: scale(1.02);
}

.topup-package-card.package-popular::before {
  opacity: 1;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.topup-package-card.package-premium {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.05) 0%, var(--card-bg) 100%);
  border-color: var(--purple);
  border-width: 3px;
  box-shadow: 0 4px 20px rgba(168, 85, 247, 0.2);
}

.package-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
  color: white;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 8px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  text-transform: uppercase;
  align-self: flex-start;
  box-shadow: 0 2px 8px rgba(43, 39, 184, 0.3);
}

.package-badge.popular {
  background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
  box-shadow: 0 2px 12px rgba(255, 107, 107, 0.4);
  animation: pulse 2s ease-in-out infinite;
}

.package-badge.premium {
  background: linear-gradient(135deg, #A855F7 0%, #6366F1 100%);
  box-shadow: 0 2px 12px rgba(168, 85, 247, 0.4);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.package-credits {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
  line-height: 1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.package-credits span {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-left: 6px;
  -webkit-text-fill-color: var(--text-secondary);
}

.package-price {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.package-price-per {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.discount-badge {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: white;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(16, 185, 129, 0.3);
  white-space: nowrap;
}

.package-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
  flex: 1;
}

.package-feature {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.package-feature::before {
  content: '✓';
  color: var(--green);
  font-weight: 700;
}

/* Responsive for top-up packages */
@media (max-width: 1200px) {
  .topup-packages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .topup-package-card.package-popular {
    transform: scale(1);
  }
}

@media (max-width: 600px) {
  .topup-packages-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .topup-package-card {
    padding: 20px 18px;
  }
  .package-credits {
    font-size: 28px;
  }
  .package-price {
    font-size: 20px;
  }
  .topup-package-card.package-popular {
    transform: scale(1);
    border-width: 2px;
  }
}

/* Dashboard & Calendar responsive */
@media (max-width: 900px) {
  .dashboard-layout {
    flex-direction: column;
  }
  .dashboard-sidebar {
    width: 100%;
    position: static;
  }
}
@media (max-width: 600px) {
  .calendar-widget { padding: 12px; }
  .calendar-header { flex-direction: column; gap: 8px; align-items: flex-start; }
  .calendar-day { font-size: 11px; }
  .calendar-month-label { min-width: 100px; font-size: 12px; }
  .calendar-detail-item { flex-direction: column; align-items: flex-start; gap: 3px; }
}


/* ===== REGISTRATIONS (pendaftaran murid baru) ===== */
.nav-badge {
  margin-left: auto; background: var(--primary); color: #fff; font-size: 11px; font-weight: 800;
  min-width: 20px; height: 20px; border-radius: 10px; display: inline-grid; place-items: center;
  padding: 0 6px; line-height: 1;
}
.nav-badge.hidden { display: none; }

.reg-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.reg-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; transition: var(--transition);
}
.reg-card:hover { border-color: var(--border-hover); }
.reg-card.is-pending { border-left: 3px solid var(--primary); }
.reg-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.reg-badge { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.05em; padding: 4px 10px; border-radius: 20px; }
.reg-badge.pending { background: rgba(43,39,184,0.10); color: var(--primary); }
.reg-badge.approved { background: var(--green-bg); color: var(--green); }
.reg-badge.declined { background: var(--red-bg); color: #dc2626; }
.reg-date { font-size: 11.5px; color: var(--text-muted); }
.reg-name { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.reg-line { font-size: 13px; color: var(--text-secondary); line-height: 1.6; word-break: break-word; }
.reg-line strong { color: var(--text-primary); font-weight: 600; }
.reg-pkg {
  margin-top: 12px; padding: 9px 12px; background: var(--purple-bg); border-radius: 8px;
  font-size: 13px; font-weight: 700; color: var(--primary);
}
.reg-expiry { margin-top: 10px; font-size: 12px; color: var(--text-muted); }
.reg-expiry.urgent { color: #dc2626; font-weight: 600; }
.reg-actions { display: flex; gap: 8px; margin-top: 14px; }
.btn-reg {
  flex: 1; border: none; border-radius: 8px; padding: 9px; font-size: 13px; font-weight: 700;
  font-family: inherit; cursor: pointer; transition: var(--transition);
}
.btn-reg.approve { background: var(--green); color: #fff; }
.btn-reg.approve:hover { filter: brightness(1.08); }
.btn-reg.decline { background: var(--bg-input); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-reg.decline:hover { border-color: #dc2626; color: #dc2626; }

/* ===== PAYMENTS & INVOICES ===== */
.payment-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(420px, 1.2fr);
  gap: 20px;
  align-items: start;
}
.payment-form-card, .payment-list-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.payment-card-title { color: var(--text-primary); font-size: 17px; margin-bottom: 18px; }
.payment-form-card .form-group { margin-bottom: 14px; }
.payment-summary-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(180px, 0.7fr); gap: 16px; margin-bottom: 20px; }
.payment-summary-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); min-height: 128px; display: flex; flex-direction: column; justify-content: space-between; gap: 8px; }
.payment-earning-card { background: linear-gradient(135deg, var(--bg-card), var(--blue-bg)); }
.payment-summary-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.payment-summary-kicker { color: var(--text-secondary); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.payment-earning-value { color: var(--primary); font-size: clamp(24px, 3vw, 34px); line-height: 1.1; }
.payment-summary-count { color: var(--primary); font-size: 32px; line-height: 1.1; }
.payment-summary-note, .payment-helper-text { color: var(--text-muted); font-size: 12px; line-height: 1.5; }
.payment-period-switch { display: inline-flex; padding: 3px; border-radius: 999px; background: var(--bg-input); border: 1px solid var(--border); }
.payment-period-btn { border: 0; border-radius: 999px; background: transparent; color: var(--text-secondary); cursor: pointer; font: inherit; font-size: 11px; font-weight: 700; padding: 7px 11px; transition: var(--transition); }
.payment-period-btn.active { background: var(--primary); color: #fff; box-shadow: 0 2px 8px var(--primary-glow); }
.payment-packages-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); margin-bottom: 20px; }
.payment-package-create-form { display: grid; grid-template-columns: minmax(180px, 1fr) minmax(150px, .6fr) auto; align-items: end; gap: 12px; margin-bottom: 18px; }
.payment-package-create-form .form-group { margin-bottom: 0; }
.payment-packages-table-wrap { overflow-x: auto; }
.payment-packages-table { width: 100%; border-collapse: collapse; min-width: 620px; }
.payment-packages-table th, .payment-packages-table td { border-bottom: 1px solid var(--border); color: var(--text-secondary); font-size: 12px; padding: 10px 8px; text-align: left; vertical-align: middle; }
.payment-packages-table th { color: var(--text-muted); font-size: 11px; letter-spacing: .04em; text-transform: uppercase; }
.payment-packages-table input[type="text"], .payment-packages-table input[type="number"] { margin: 0; min-width: 140px; padding: 8px 10px; }
.payment-packages-table input[type="number"] { max-width: 150px; }
.package-active-toggle { align-items: center; color: var(--text-secondary); cursor: pointer; display: inline-flex; gap: 7px; white-space: nowrap; }
.package-active-toggle input { accent-color: var(--green); }
.payment-table-empty { color: var(--text-muted); padding: 22px 8px !important; text-align: center !important; }
.payment-form-card input[readonly] { background: var(--bg-card2); color: var(--text-secondary); cursor: not-allowed; }
.button-spinner { animation: spin .7s linear infinite; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; display: inline-block; height: 14px; margin-right: 8px; vertical-align: -2px; width: 14px; }
button:disabled { cursor: wait; opacity: .72; }
.payment-total-preview {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin: 18px 0; padding: 14px 16px; border-radius: var(--radius-sm);
  background: var(--blue-bg); color: var(--text-secondary); font-size: 14px;
}
.payment-total-preview strong { color: var(--primary); font-size: 20px; }
.payment-list-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.payment-list-header .payment-card-title { margin-bottom: 0; }
.payments-list { display: grid; gap: 10px; max-height: 650px; overflow-y: auto; }
.payment-item {
  display: flex; justify-content: space-between; gap: 16px; padding: 16px;
  border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-card2);
}
.payment-item-title { color: var(--primary); font-size: 14px; font-weight: 800; margin-bottom: 5px; }
.payment-item-meta { color: var(--text-secondary); font-size: 12px; line-height: 1.6; }
.payment-item-side { display: flex; min-width: 205px; flex-direction: column; align-items: flex-end; gap: 5px; color: var(--text-primary); }
.payment-status { color: var(--text-muted); font-size: 11px; }
.payment-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; margin-top: 5px; }
.payment-actions .btn-secondary { padding: 7px 9px; font-size: 11px; }

@media (max-width: 900px) {
  .payment-layout { grid-template-columns: 1fr; }
  .payment-summary-grid { grid-template-columns: 1fr; }
  .payment-package-create-form { grid-template-columns: 1fr 1fr; }
  .payment-package-create-form button { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .payment-package-create-form { grid-template-columns: 1fr; }
  .payment-package-create-form button { grid-column: auto; }
}
@media (max-width: 560px) {
  .payment-form-card, .payment-list-card { padding: 16px; }
  .payment-item { flex-direction: column; }
  .payment-item-side { min-width: 0; align-items: flex-start; }
  .payment-actions { justify-content: flex-start; }
}