/* ═══════════════════════════════════════════════════════════════
   Course Platform Styles — Fucking Amazing
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Light mode defaults — dark mode overrides come from main.css [data-theme="dark"] */
  --c-bg: #f7f8fc;
  --c-surface: #ffffff;
  --c-card: #ffffff;
  --c-border: #e3e5eb;
  --c-text: #1a1b1e;
  --c-muted: #6b7280;
  --c-accent: #3e64de;
  --c-accent-dim: rgba(62,100,222,0.1);
  --c-success: #4caf50;
  --c-error: #f44336;
  --sidebar-width: 300px;
}

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body.course-body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: 'Inter', 'Segoe UI', sans-serif;
  min-height: 100vh;
}

/* ── Utility ─────────────────────────────────────────────────── */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ── Course Top Bar ──────────────────────────────────────────── */
.course-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 56px;
  gap: 1rem;
}

.topbar-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-accent);
  text-decoration: none;
  white-space: nowrap;
}

.topbar-progress {
  flex: 1;
  max-width: 400px;
}

.progress-label {
  font-size: 0.75rem;
  color: var(--c-muted);
  margin-bottom: 4px;
}

.progress-bar-wrap {
  background: var(--c-border);
  border-radius: 999px;
  height: 6px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--c-accent);
  border-radius: 999px;
  transition: width 0.4s ease;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar-user {
  font-size: 0.8rem;
  color: var(--c-muted);
}

.btn-logout {
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}
.btn-logout:hover { color: var(--c-text); border-color: var(--c-text); }

.btn-back-site {
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  font-size: 0.8rem;
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-back-site:hover { color: var(--c-text); border-color: var(--c-text); }

/* ── Course Layout ───────────────────────────────────────────── */
.course-layout {
  display: flex;
  height: calc(100vh - 56px);
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.course-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--c-border) transparent;
}

.course-sidebar::-webkit-scrollbar { width: 4px; }
.course-sidebar::-webkit-scrollbar-track { background: transparent; }
.course-sidebar::-webkit-scrollbar-thumb { background: var(--c-border); border-radius: 4px; }

.sidebar-header {
  padding: 1rem 1.25rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-border);
}

.lesson-category-group { border-bottom: 1px solid var(--c-border); }

.category-toggle {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--c-text);
  padding: 0.75rem 1.25rem;
  text-align: left;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  transition: background 0.2s;
}
.category-toggle:hover { background: var(--c-card); }
.category-toggle .cat-name { flex: 1; }
.category-toggle .cat-meta { font-size: 0.7rem; color: var(--c-muted); font-weight: 400; }
.category-toggle .cat-arrow { color: var(--c-muted); font-size: 0.7rem; transition: transform 0.2s; }
.category-toggle.open .cat-arrow { transform: rotate(180deg); }

.lesson-list { display: none; }
.lesson-list.open { display: block; }

.lesson-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 1.25rem 0.55rem 1.5rem;
  cursor: pointer;
  text-decoration: none;
  color: var(--c-muted);
  font-size: 0.8rem;
  transition: background 0.15s, color 0.15s;
  border-left: 3px solid transparent;
}
.lesson-item:hover { background: var(--c-card); color: var(--c-text); }
.lesson-item.active { border-left-color: var(--c-accent); background: var(--c-accent-dim); color: var(--c-text); }
.lesson-item.completed { color: var(--c-text); }

.lesson-item .lesson-num {
  font-size: 0.68rem;
  color: var(--c-muted);
  min-width: 18px;
}
.lesson-item .lesson-title-text { flex: 1; line-height: 1.3; }
.lesson-item .lesson-icon { font-size: 0.75rem; flex-shrink: 0; }
.lesson-item.completed .lesson-icon { color: var(--c-success); }
.lesson-item.locked .lesson-icon { color: var(--c-muted); }
.lesson-item.free-badge::after {
  content: 'FREE';
  font-size: 0.6rem;
  background: var(--c-accent);
  color: var(--c-bg);
  padding: 1px 4px;
  border-radius: 3px;
  font-weight: 700;
}

/* ── Main Content ────────────────────────────────────────────── */
.course-main {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

/* ── Gate Section (logged-out view) ──────────────────────────── */
.gate-section {
  max-width: 900px;
  margin: 0 auto;
}

.gate-hero {
  text-align: center;
  padding: 3rem 1rem 2rem;
}

.gate-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.gate-hero-dim { color: rgba(26,27,30,0.3); }
[data-theme="dark"] .gate-hero-dim { color: rgba(240,240,240,0.3); }

.gate-hero h1 em {
  font-style: normal;
  color: var(--c-accent);
}

.gate-hero p {
  font-size: 1.1rem;
  color: var(--c-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.gate-price {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}
.gate-price .amount { font-size: 3rem; font-weight: 800; color: var(--c-accent); }
.gate-price .currency { font-size: 1.5rem; color: var(--c-accent); }
.gate-price .period { font-size: 0.9rem; color: var(--c-muted); }

.gate-cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-bg);
  border: none;
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: opacity 0.2s, transform 0.1s;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-secondary {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: border-color 0.2s;
}
.btn-secondary:hover { border-color: var(--c-accent); color: var(--c-accent); }

.gate-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 3rem;
}

.gate-feature-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
}
.gate-feature-card .icon { font-size: 1.8rem; margin-bottom: 0.5rem; }
.gate-feature-card h3 { font-size: 0.9rem; font-weight: 600; margin-bottom: 0.3rem; }
.gate-feature-card p { font-size: 0.8rem; color: var(--c-muted); line-height: 1.4; }

.free-preview-section { margin-bottom: 2rem; }
.free-preview-section h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 1rem; }

.free-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.preview-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
  text-decoration: none;
  color: var(--c-text);
  display: block;
}
.preview-card:hover { border-color: var(--c-accent); transform: translateY(-2px); }

.preview-thumb {
  position: relative;
  padding-bottom: 56.25%;
  background: var(--c-border);
  overflow: hidden;
}
.preview-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.preview-thumb .play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
  font-size: 2rem;
  color: white;
  opacity: 0;
  transition: opacity 0.2s;
}
.preview-card:hover .play-btn { opacity: 1; }

.preview-info { padding: 0.75rem; }
.preview-num { font-size: 0.68rem; color: var(--c-accent); font-weight: 600; }
.preview-title { font-size: 0.85rem; font-weight: 500; margin-top: 0.2rem; line-height: 1.3; }
.free-badge-tag {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-bg);
  font-size: 0.6rem;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  margin-top: 0.3rem;
}

/* ── Dashboard (logged-in + paid view) ───────────────────────── */
.dashboard-section { max-width: 100%; }

.dashboard-welcome {
  margin-bottom: 2rem;
}
.dashboard-welcome h1 { font-size: 1.6rem; font-weight: 700; }
.dashboard-welcome p { color: var(--c-muted); margin-top: 0.3rem; }

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
}
.stat-card .stat-num { font-size: 2rem; font-weight: 800; color: var(--c-accent); }
.stat-card .stat-label { font-size: 0.75rem; color: var(--c-muted); margin-top: 0.2rem; }

/* Upgrade prompt for logged-in but unpaid */
.upgrade-prompt {
  background: var(--c-card);
  border: 1px solid var(--c-accent);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  margin-bottom: 2rem;
}
.upgrade-prompt h2 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.upgrade-prompt p { color: var(--c-muted); margin-bottom: 1.25rem; font-size: 0.9rem; }

/* ── Auth Modal ───────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.modal-box {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  padding: 2rem;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--c-muted);
  font-size: 1.3rem;
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem;
}
.modal-close:hover { color: var(--c-text); }

.modal-tabs {
  display: flex;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 1.5rem;
}

.modal-tab {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--c-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s, border-color 0.2s;
}
.modal-tab.active { color: var(--c-accent); border-bottom-color: var(--c-accent); }

.auth-form { display: flex; flex-direction: column; gap: 1rem; }

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label { font-size: 0.8rem; color: var(--c-muted); font-weight: 500; }

.form-group input {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  color: var(--c-text);
  padding: 0.65rem 0.9rem;
  font-size: 0.9rem;
  transition: border-color 0.2s;
  outline: none;
}
.form-group input:focus { border-color: var(--c-accent); }
.form-group input::placeholder { color: var(--c-muted); }

.form-error {
  font-size: 0.8rem;
  color: var(--c-error);
  margin-top: -0.3rem;
}

.btn-form {
  background: var(--c-accent);
  color: var(--c-bg);
  border: none;
  padding: 0.75rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-form:hover { opacity: 0.9; }
.btn-form:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Video Player ─────────────────────────────────────────────── */
.player-layout {
  display: flex;
  height: calc(100vh - 56px);
}

.player-main {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.video-container iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-lock {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  border-radius: 12px;
}
.video-lock .lock-icon { font-size: 3rem; margin-bottom: 1rem; }
.video-lock h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.video-lock p { color: var(--c-muted); font-size: 0.9rem; margin-bottom: 1.5rem; }

.lesson-header {
  margin-bottom: 1.5rem;
}
.lesson-category-tag {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.5rem;
}
.lesson-title-main {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.2;
}

.lesson-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn-complete {
  background: var(--c-accent);
  color: var(--c-bg);
  border: none;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-complete:hover { opacity: 0.9; }
.btn-complete.done {
  background: var(--c-success);
  color: white;
  cursor: default;
}

.btn-nav {
  background: transparent;
  border: 1px solid var(--c-border);
  color: var(--c-text);
  padding: 0.65rem 1.2rem;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: border-color 0.2s;
}
.btn-nav:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ── Quiz Section ─────────────────────────────────────────────── */
.quiz-section {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 1.75rem;
  margin-top: 2rem;
}

.quiz-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.quiz-section .quiz-intro { font-size: 0.85rem; color: var(--c-muted); margin-bottom: 1.5rem; }

.quiz-question-block { margin-bottom: 1.5rem; }
.quiz-question-text { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.75rem; line-height: 1.4; }

.quiz-options { display: flex; flex-direction: column; gap: 0.5rem; }

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 0.7rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  text-align: left;
  color: var(--c-text);
  font-size: 0.88rem;
  line-height: 1.4;
}
.quiz-option:hover { border-color: var(--c-accent); background: var(--c-accent-dim); }
.quiz-option input[type="radio"] { margin-top: 2px; accent-color: var(--c-accent); flex-shrink: 0; }
.quiz-option.correct { border-color: var(--c-success); background: rgba(76,175,80,0.1); }
.quiz-option.wrong { border-color: var(--c-error); background: rgba(244,67,54,0.1); }
.quiz-option.revealed { cursor: default; }

.quiz-submit {
  background: var(--c-accent);
  color: var(--c-bg);
  border: none;
  padding: 0.7rem 1.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: opacity 0.2s;
}
.quiz-submit:hover { opacity: 0.9; }
.quiz-submit:disabled { opacity: 0.4; cursor: not-allowed; }

.quiz-result {
  margin-top: 1.5rem;
  text-align: center;
  padding: 1.25rem;
  background: var(--c-surface);
  border-radius: 10px;
  border: 1px solid var(--c-border);
}
.quiz-result .score-display { font-size: 2.5rem; font-weight: 800; color: var(--c-accent); }
.quiz-result .score-label { font-size: 0.85rem; color: var(--c-muted); margin-top: 0.2rem; }

/* ── Paywall notification ─────────────────────────────────────── */
.payment-banner {
  position: fixed;
  top: 70px;
  right: 1rem;
  background: var(--c-success);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 200;
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 3s forwards;
}

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { to { opacity: 0; transform: translateX(100%); } }

/* ── Loading Spinner ──────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--c-border);
  border-top-color: var(--c-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 0.4rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .course-layout { flex-direction: column; height: auto; }
  .course-sidebar { width: 100%; min-width: 0; max-height: 40vh; }
  .player-layout { flex-direction: column; height: auto; }
  .player-main { padding: 1rem; }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
  .course-main { padding: 1rem; }
  .topbar-progress { display: none; }
}