/* =============================================
   SpeakAI - Main Stylesheet
   ============================================= */

:root {
  --bg: #0d0f1a;
  --bg2: #141728;
  --bg3: #1c2035;
  --card: #1e2238;
  --card2: #252a42;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(255,255,255,0.14);
  --text: #e8eaf6;
  --text2: #9ba3c8;
  --text3: #6b74a0;
  --primary: #6c63ff;
  --primary2: #8b84ff;
  --primary-light: rgba(108,99,255,0.15);
  --accent: #00d4aa;
  --accent-light: rgba(0,212,170,0.12);
  --danger: #ff5e7a;
  --warning: #ffc553;
  --success: #4ade80;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --transition: 0.2s ease;
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary2); text-decoration: none; }
a:hover { color: var(--accent); }

/* ── Scrollbar ─────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--card2); border-radius: 4px; }

/* ── Buttons ───────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition);
  text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary2); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(108,99,255,0.4); color: #fff; }
.btn-accent { background: var(--accent); color: #0d1a16; }
.btn-accent:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1.5px solid var(--border2); color: var(--text2); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary2); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.85; }
.btn-lg { padding: 14px 28px; font-size: 16px; border-radius: var(--radius); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-icon { padding: 10px; border-radius: 50%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Cards ─────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card-sm { padding: 16px; border-radius: var(--radius-sm); }

/* ── Form elements ─────────────── */
.form-group { margin-bottom: 18px; }
.form-label { display: block; margin-bottom: 7px; font-size: 13px; font-weight: 500; color: var(--text2); }
.form-control {
  width: 100%; padding: 12px 16px;
  background: var(--bg3); border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font-size: 14px; transition: border-color var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--primary); }
.form-control::placeholder { color: var(--text3); }
select.form-control { cursor: pointer; }

/* ── Nav ───────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 64px; background: rgba(13,15,26,0.9);
  backdrop-filter: blur(16px); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 24px;
  gap: 16px;
}
.navbar-brand { font-size: 20px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.navbar-brand span { color: var(--primary2); }
.navbar-brand .logo-icon { font-size: 24px; }
.navbar-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-link {
  padding: 8px 14px; border-radius: var(--radius-sm);
  color: var(--text2); font-size: 14px; font-weight: 500;
  transition: all var(--transition); display: flex; align-items: center; gap: 6px;
}
.nav-link:hover, .nav-link.active { background: var(--primary-light); color: var(--primary2); }
.nav-user { display: flex; align-items: center; gap: 10px; margin-left: 8px; }
.avatar-sm {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff; flex-shrink: 0;
}

.page-wrap { padding-top: 64px; min-height: 100vh; }

/* ── Auth page ─────────────────── */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg);
  position: relative; overflow: hidden;
  padding: 20px;
}
.auth-bg-circle {
  position: absolute; border-radius: 50%;
  background: radial-gradient(circle, rgba(108,99,255,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.auth-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; padding: 40px; width: 100%; max-width: 440px;
  position: relative; z-index: 1;
  box-shadow: var(--shadow-lg);
}
.auth-logo { text-align: center; margin-bottom: 28px; }
.auth-logo .logo-big { font-size: 40px; }
.auth-logo h1 { font-size: 26px; font-weight: 700; margin: 8px 0 4px; }
.auth-logo p { color: var(--text2); font-size: 14px; }
.auth-tabs { display: flex; gap: 4px; background: var(--bg3); border-radius: var(--radius-sm); padding: 4px; margin-bottom: 28px; }
.auth-tab {
  flex: 1; padding: 9px; text-align: center; border-radius: 6px;
  cursor: pointer; font-size: 14px; font-weight: 500;
  transition: all var(--transition); color: var(--text2);
}
.auth-tab.active { background: var(--primary); color: #fff; }
.auth-form { display: none; }
.auth-form.active { display: block; }
.level-select-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.level-option {
  padding: 10px 6px; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); text-align: center; cursor: pointer;
  transition: all var(--transition); font-size: 13px;
}
.level-option:hover { border-color: var(--primary); }
.level-option.selected { border-color: var(--primary); background: var(--primary-light); color: var(--primary2); }
.level-option .level-icon { font-size: 20px; display: block; margin-bottom: 4px; }

/* ── Dashboard ─────────────────── */
.dashboard { padding: 24px; max-width: 1200px; margin: 0 auto; }
.dashboard-header { margin-bottom: 28px; }
.dashboard-header h1 { font-size: 26px; font-weight: 700; }
.dashboard-header p { color: var(--text2); margin-top: 4px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  display: flex; flex-direction: column; gap: 8px;
}
.stat-icon { font-size: 28px; }
.stat-value { font-size: 28px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--text2); }
.stat-card.highlight { background: var(--primary-light); border-color: rgba(108,99,255,0.3); }
.stat-card.highlight .stat-value { color: var(--primary2); }

.dashboard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media(max-width:768px) { .dashboard-grid { grid-template-columns: 1fr; } }

.section-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }

/* Badges */
.badges-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.badge-item {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 20px; padding: 6px 14px; font-size: 13px;
}
.badge-item .badge-icon { font-size: 18px; }

/* XP bar */
.xp-bar-wrap { margin-bottom: 20px; }
.xp-bar-label { display: flex; justify-content: space-between; font-size: 13px; color: var(--text2); margin-bottom: 6px; }
.xp-bar { height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden; }
.xp-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 4px; transition: width 1s ease; }

/* Sessions list */
.session-item {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 0; border-bottom: 1px solid var(--border);
}
.session-item:last-child { border-bottom: none; }
.session-icon { font-size: 24px; flex-shrink: 0; }
.session-info { flex: 1; }
.session-info strong { display: block; font-size: 14px; font-weight: 600; }
.session-info span { font-size: 12px; color: var(--text2); }
.session-score { font-size: 18px; font-weight: 700; }
.score-high { color: var(--success); }
.score-mid { color: var(--warning); }
.score-low { color: var(--danger); }

/* ── Session (live) page ───────── */
.session-page { height: 100vh; display: flex; flex-direction: column; overflow: hidden; }

/* Pre-session setup */
.session-setup {
  display: flex; align-items: center; justify-content: center;
  flex: 1; padding: 24px;
}
.setup-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; padding: 40px; width: 100%; max-width: 560px;
  box-shadow: var(--shadow-lg);
}
.setup-card h2 { font-size: 24px; font-weight: 700; margin-bottom: 6px; }
.setup-card p { color: var(--text2); margin-bottom: 28px; font-size: 14px; }
.topic-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px; max-height: 300px; overflow-y: auto; margin-bottom: 20px; padding-right: 4px; }
.topic-btn {
  padding: 12px; border: 1.5px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; text-align: left;
  background: var(--bg3); transition: all var(--transition);
  display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 500;
}
.topic-btn:hover { border-color: var(--primary); }
.topic-btn.selected { border-color: var(--primary); background: var(--primary-light); color: var(--primary2); }
.topic-icon { font-size: 20px; flex-shrink: 0; }

/* Live session UI */
.live-session { display: none; flex: 1; overflow: hidden; flex-direction: column; }
.live-session.active { display: flex; }

.session-topbar {
  display: flex; align-items: center; gap: 16px; padding: 12px 20px;
  background: var(--bg2); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.session-info-bar { flex: 1; display: flex; align-items: center; gap: 20px; }
.session-badge {
  padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600;
}
.badge-level { background: var(--primary-light); color: var(--primary2); }
.badge-topic { background: var(--accent-light); color: var(--accent); }
.question-progress { font-size: 13px; color: var(--text2); }
.timer { font-size: 13px; color: var(--text2); font-variant-numeric: tabular-nums; }

.session-body { flex: 1; display: flex; overflow: hidden; }

/* AI Avatar side */
.ai-side {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 24px; gap: 20px;
  border-right: 1px solid var(--border);
}
.ai-video-card {
  width: 280px; height: 280px; border-radius: 20px;
  background: var(--bg3); border: 2px solid var(--border2);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.ai-avatar-bg {
  position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 60%, rgba(108,99,255,0.2) 0%, transparent 70%);
}
.ai-avatar { position: relative; z-index: 1; text-align: center; }
.ai-avatar-emoji { font-size: 80px; display: block; }
.ai-name { margin-top: 8px; font-weight: 600; font-size: 16px; }
.ai-status {
  margin-top: 6px; font-size: 12px; color: var(--text2);
  display: flex; align-items: center; gap: 6px;
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--text3);
  transition: background var(--transition);
}
.status-dot.speaking { background: var(--accent); animation: pulse 1s infinite; }
.status-dot.listening { background: var(--warning); animation: pulse 0.7s infinite; }
.status-dot.thinking { background: var(--primary2); animation: pulse 1.3s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

/* Sound wave (speaking indicator) */
.sound-wave { display: flex; align-items: center; gap: 3px; height: 28px; }
.wave-bar {
  width: 3px; border-radius: 2px; background: var(--primary2);
  animation: wave 1.2s ease-in-out infinite;
  transition: background var(--transition);
}
.wave-bar:nth-child(1){height:10px;animation-delay:0s}
.wave-bar:nth-child(2){height:18px;animation-delay:0.1s}
.wave-bar:nth-child(3){height:24px;animation-delay:0.2s}
.wave-bar:nth-child(4){height:18px;animation-delay:0.3s}
.wave-bar:nth-child(5){height:10px;animation-delay:0.4s}
.wave-bar.active { background: var(--accent); }
.wave-bar.mic-active { background: var(--warning); }
@keyframes wave {
  0%,100%{transform:scaleY(0.5)} 50%{transform:scaleY(1)}
}
.sound-wave.paused .wave-bar { animation-play-state: paused; transform: scaleY(0.3); }

/* Subtitles */
.ai-subtitle {
  width: 100%; max-width: 400px;
  background: rgba(0,0,0,0.6); border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 14px; text-align: center;
  min-height: 48px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); backdrop-filter: blur(8px);
  transition: opacity var(--transition);
}
.ai-subtitle.hidden { opacity: 0; }

/* User side */
.user-side {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 24px; gap: 20px;
}
.user-video-card {
  width: 220px; height: 220px; border-radius: 20px;
  background: var(--bg3); border: 2px solid var(--border);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.user-avatar-big { font-size: 64px; }
.user-label { margin-top: 8px; font-size: 14px; font-weight: 500; color: var(--text2); }

.mic-controls { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.mic-btn {
  width: 72px; height: 72px; border-radius: 50%; border: none;
  background: var(--primary); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; transition: all var(--transition);
  box-shadow: 0 0 0 0 rgba(108,99,255,0.4);
}
.mic-btn:hover { transform: scale(1.05); }
.mic-btn.recording { background: var(--danger); animation: mic-pulse 1.2s ease-in-out infinite; }
@keyframes mic-pulse { 0%{box-shadow:0 0 0 0 rgba(255,94,122,0.5)} 70%{box-shadow:0 0 0 20px rgba(255,94,122,0)} 100%{box-shadow:0 0 0 0 rgba(255,94,122,0)} }
.mic-hint { font-size: 13px; color: var(--text2); }

.user-subtitle {
  width: 100%; max-width: 360px;
  background: rgba(0,0,0,0.6); border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 14px; text-align: center; color: var(--text2);
  min-height: 48px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); font-style: italic;
  transition: opacity var(--transition);
}
.user-subtitle.hidden { opacity: 0; }

/* Bottom bar */
.session-bottom {
  padding: 14px 20px; background: var(--bg2);
  border-top: 1px solid var(--border); flex-shrink: 0;
}
.bottom-controls { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.subtitle-toggle { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text2); cursor: pointer; }
.toggle-switch {
  width: 38px; height: 20px; border-radius: 10px;
  background: var(--bg3); border: 1px solid var(--border2);
  position: relative; transition: background var(--transition); cursor: pointer;
}
.toggle-switch.on { background: var(--accent); }
.toggle-switch::after {
  content:''; width: 14px; height: 14px; border-radius: 50%;
  background: #fff; position: absolute; top: 2px; left: 2px;
  transition: transform var(--transition);
}
.toggle-switch.on::after { transform: translateX(18px); }
.score-display { display: flex; align-items: center; gap: 16px; font-size: 13px; }
.score-display span { color: var(--text2); }
.score-display strong { color: var(--text); font-size: 15px; }

/* Feedback toast */
.feedback-toast {
  position: fixed; bottom: 90px; left: 50%; transform: translateX(-50%);
  background: var(--card2); border: 1px solid var(--border2);
  border-radius: var(--radius); padding: 16px 20px;
  max-width: 520px; width: calc(100% - 40px);
  box-shadow: var(--shadow-lg); z-index: 200;
  animation: slideUp 0.3s ease; display: none;
}
.feedback-toast.show { display: block; }
@keyframes slideUp { from{transform:translateX(-50%) translateY(20px);opacity:0} to{transform:translateX(-50%) translateY(0);opacity:1} }
.feedback-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-weight: 600; }
.feedback-correct { color: var(--success); }
.feedback-wrong { color: var(--warning); }
.feedback-correction { font-size: 13px; color: var(--text2); padding: 8px 12px; background: var(--bg3); border-radius: var(--radius-sm); margin-top: 8px; }
.feedback-tip { font-size: 12px; color: var(--accent); margin-top: 6px; }

/* Result modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.8);
  display: none; align-items: center; justify-content: center;
  z-index: 500; padding: 20px;
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 20px; padding: 40px; max-width: 480px; width: 100%;
  text-align: center; box-shadow: var(--shadow-lg);
  animation: popIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes popIn { from{transform:scale(0.85);opacity:0} to{transform:scale(1);opacity:1} }
.result-emoji { font-size: 64px; display: block; margin-bottom: 16px; }
.result-title { font-size: 24px; font-weight: 700; margin-bottom: 8px; }
.result-subtitle { color: var(--text2); margin-bottom: 28px; }
.result-stats { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-bottom: 28px; }
.result-stat { background: var(--bg3); border-radius: var(--radius-sm); padding: 14px; }
.result-stat .val { font-size: 22px; font-weight: 700; }
.result-stat .lbl { font-size: 11px; color: var(--text2); margin-top: 2px; }
.result-xp { background: var(--primary-light); border: 1px solid rgba(108,99,255,0.3); border-radius: var(--radius-sm); padding: 14px; margin-bottom: 20px; font-size: 15px; font-weight: 600; color: var(--primary2); }

/* Settings page */
.settings-page { max-width: 680px; margin: 0 auto; padding: 28px 24px; }
.settings-section { margin-bottom: 32px; }
.settings-section h2 { font-size: 17px; font-weight: 600; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }

/* History page */
.history-page { max-width: 900px; margin: 0 auto; padding: 28px 24px; }
.history-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.filter-btn { padding: 7px 16px; border-radius: 20px; border: 1.5px solid var(--border); background: transparent; color: var(--text2); font-size: 13px; cursor: pointer; transition: all var(--transition); }
.filter-btn.active, .filter-btn:hover { border-color: var(--primary); color: var(--primary2); background: var(--primary-light); }

/* Responsive */
@media(max-width: 600px) {
  .session-body { flex-direction: column; }
  .ai-side { border-right: none; border-bottom: 1px solid var(--border); padding: 16px; }
  .ai-video-card { width: 200px; height: 200px; }
  .user-video-card { width: 160px; height: 160px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .navbar { padding: 0 14px; }
  .dashboard { padding: 16px; }
}

/* Loading spinner */
.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); } }

/* Chip */
.chip { padding: 3px 10px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.chip-primary { background: var(--primary-light); color: var(--primary2); }
.chip-accent { background: var(--accent-light); color: var(--accent); }
.chip-success { background: rgba(74,222,128,0.1); color: var(--success); }
.chip-danger { background: rgba(255,94,122,0.1); color: var(--danger); }