/* ============================================================
   style.css — NoEnglish Frontend
   Design: Dark glassmorphism · Vibrant gradients · Micro-animations
   ============================================================ */

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

:root {
  --bg-base:      #0b0f1a;
  --bg-surface:   #111827;
  --bg-elevated:  #1a2236;
  --bg-glass:     rgba(255,255,255,0.04);

  --primary:      #6366f1;
  --primary-glow: rgba(99,102,241,0.35);
  --accent:       #06b6d4;
  --accent-glow:  rgba(6,182,212,0.30);
  --success:      #10b981;
  --warning:      #f59e0b;
  --danger:       #ef4444;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  --border:       rgba(255,255,255,0.08);
  --border-focus: rgba(99,102,241,0.6);

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 22px;
  --radius-xl: 30px;

  --shadow-card: 0 4px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px var(--primary-glow);

  --font-body: 'Inter', sans-serif;
  --font-head: 'Space Grotesk', sans-serif;

  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.hidden { display: none !important; }

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: 3px; }

/* ── NAVBAR ───────────────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(11,15,26,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.5); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 32px; height: 64px;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none;
}
.logo-icon { font-size: 22px; }
.logo-text { font-family: var(--font-head); font-size: 18px; font-weight: 700; color: var(--text-primary); }
.logo-accent { color: var(--primary); }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-link {
  padding: 6px 14px; border-radius: var(--radius-sm);
  text-decoration: none; color: var(--text-secondary);
  font-size: 14px; font-weight: 500;
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-glass); }
.nav-badge {
  font-size: 11px; font-weight: 600; letter-spacing: .5px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  padding: 4px 12px; border: 1px solid var(--border); border-radius: 20px;
  white-space: nowrap;
}

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  padding-top: 80px; position: relative; overflow: hidden;
}
.hero-bg-orbs { position: absolute; inset: 0; pointer-events: none; }
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.18;
}
.orb-1 { width: 600px; height: 600px; background: var(--primary); top: -200px; right: -100px; animation: orbFloat 8s ease-in-out infinite; }
.orb-2 { width: 400px; height: 400px; background: var(--accent); bottom: -100px; left: -100px; animation: orbFloat 10s ease-in-out infinite reverse; }
.orb-3 { width: 300px; height: 300px; background: #a855f7; top: 40%; left: 40%; animation: orbFloat 12s ease-in-out infinite 2s; }

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(20px, -30px) scale(1.05); }
}

.hero .container { display: flex; align-items: center; gap: 60px; position: relative; }
.hero-content { flex: 1; max-width: 580px; }
.hero-visual { flex: 0 0 340px; position: relative; height: 340px; display: none; }

@media (min-width: 900px) { .hero-visual { display: block; } }

.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: 20px; padding: 6px 14px;
  font-size: 13px; font-weight: 500; color: var(--accent);
  margin-bottom: 20px; backdrop-filter: blur(10px);
}
.hero-title {
  font-family: var(--font-head); font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800; line-height: 1.1; margin-bottom: 18px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 460px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 40px; }
.hero-stats { display: flex; align-items: center; gap: 20px; }
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-num { font-family: var(--font-head); font-size: 1.5rem; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-muted); }
.stat-sep { width: 1px; height: 36px; background: var(--border); }

/* Floating cards */
.floating-card {
  position: absolute; display: flex; align-items: center; gap: 10px;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 18px;
  font-weight: 600; font-size: 14px;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(10px);
}
.fc-icon { font-size: 20px; }
.card-a { top: 30px; left: 0; animation: floatA 6s ease-in-out infinite; }
.card-b { bottom: 60px; right: 0; animation: floatB 7s ease-in-out infinite 1s; color: var(--success); border-color: rgba(16,185,129,0.3); }
.card-c { top: 140px; right: 20px; animation: floatA 5s ease-in-out infinite 2s; color: var(--accent); }

@keyframes floatA { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-12px)} }
@keyframes floatB { 0%,100%{transform:translateY(0)} 50%{transform:translateY(10px)} }

/* ── BUTTONS ──────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius);
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: none; text-decoration: none;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0); transition: background var(--transition);
}
.btn:hover::after { background: rgba(255,255,255,0.07); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #818cf8);
  color: white; box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover { box-shadow: 0 6px 30px var(--primary-glow); transform: translateY(-1px); }

.btn-ghost {
  background: var(--bg-glass); color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text-primary); border-color: var(--border-focus); }

.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: var(--radius-sm); }
.btn-full { width: 100%; justify-content: center; }
.btn-icon { font-size: 16px; }

/* ── SECTIONS ─────────────────────────────────────────────── */
.section { padding: 90px 0; }
.section-dark { background: var(--bg-surface); }

.section-header { text-align: center; margin-bottom: 52px; }
.section-title {
  font-family: var(--font-head); font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700; margin-bottom: 12px;
}
.section-sub { color: var(--text-secondary); font-size: 1rem; max-width: 520px; margin: 0 auto; }

/* ── LOADING & ERROR ──────────────────────────────────────── */
.loading-state, .error-state {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding: 60px 20px; color: var(--text-secondary);
}
.spinner {
  width: 40px; height: 40px; border: 3px solid var(--border);
  border-top-color: var(--primary); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.spinner-sm { width: 20px; height: 20px; border-width: 2px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── SITUATIONS GRID ──────────────────────────────────────── */
.situations-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.situation-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative; overflow: hidden;
}
.situation-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--card-color, var(--primary)), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.situation-card:hover { transform: translateY(-4px); border-color: var(--card-color, var(--primary)); box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.situation-card:hover::before { opacity: 0.07; }
.situation-card.active { border-color: var(--card-color, var(--primary)); background: var(--bg-glass); }
.situation-card.active::before { opacity: 0.1; }

.card-emoji { font-size: 44px; margin-bottom: 14px; display: block; }
.card-title { font-family: var(--font-head); font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.card-meta { margin-top: 14px; font-size: 12px; color: var(--text-muted); display: flex; gap: 8px; }
.card-tag { background: var(--bg-glass); border: 1px solid var(--border); border-radius: 20px; padding: 2px 10px; }

/* ── VOCAB MAP ────────────────────────────────────────────── */
.vocab-prompt {
  display: flex; align-items: center; justify-content: center;
  padding: 60px 20px; color: var(--text-muted); font-size: 1rem;
  border: 2px dashed var(--border); border-radius: var(--radius-lg);
}
.vocab-progress-bar-wrap { margin-bottom: 28px; }
.vocab-progress-label {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 8px; font-size: 14px; font-weight: 600;
}
.vocab-progress-bar {
  height: 8px; background: var(--border);
  border-radius: 4px; overflow: hidden;
}
.vocab-progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px; transition: width 0.5s cubic-bezier(.4,0,.2,1);
}
.score-badge {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  font-weight: 700;
}
.dnd-arena { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 680px) { .dnd-arena { grid-template-columns: 1fr; } }

.dnd-col {
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px;
}
.dnd-col-title { font-size: 14px; font-weight: 700; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }

/* Word cards */
.word-card {
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 10px;
  cursor: grab; user-select: none;
  transition: all var(--transition); display: flex; flex-direction: column; gap: 4px;
}
.word-card:hover { border-color: var(--primary); transform: translateX(3px); }
.word-card.dragging { opacity: 0.4; cursor: grabbing; }
.word-card.matched { background: rgba(16,185,129,0.12); border-color: var(--success); cursor: default; }
.word-card.matched:hover { transform: none; }
.word-card-word { font-weight: 700; font-size: 15px; color: var(--text-primary); }
.word-card-phonetic { font-size: 12px; color: var(--accent); }

/* Definition zones */
.def-zone {
  background: var(--bg-glass); border: 2px dashed var(--border);
  border-radius: var(--radius); padding: 14px 16px; margin-bottom: 10px;
  min-height: 72px; transition: all var(--transition);
  display: flex; flex-direction: column; gap: 6px;
}
.def-zone.drag-over { border-color: var(--primary); background: var(--primary-glow); }
.def-zone.correct { border-color: var(--success); border-style: solid; background: rgba(16,185,129,0.08); }
.def-zone.wrong { border-color: var(--danger); background: rgba(239,68,68,0.08); animation: shake 0.4s; }
.def-zone-text { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.def-zone-matched { font-size: 13px; color: var(--success); font-weight: 600; display: flex; align-items: center; gap: 6px; }

@keyframes shake {
  0%,100%{transform:translateX(0)} 20%{transform:translateX(-5px)} 40%{transform:translateX(5px)} 60%{transform:translateX(-3px)} 80%{transform:translateX(3px)}
}
.complete-banner {
  margin-top: 24px; padding: 20px; text-align: center;
  background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.4);
  border-radius: var(--radius-lg); font-weight: 700; color: var(--success); font-size: 1.1rem;
  animation: fadeInUp 0.5s ease;
}

/* ── VOICE PRACTICE ───────────────────────────────────────── */
.voice-layout { display: grid; grid-template-columns: 280px 1fr 260px; gap: 20px; align-items: start; }
@media (max-width: 1024px) { .voice-layout { grid-template-columns: 1fr 1fr; } }
@media (max-width: 680px)  { .voice-layout { grid-template-columns: 1fr; } }

.voice-panel {
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.voice-panel-header {
  background: var(--bg-surface); padding: 14px 20px;
  font-weight: 700; font-size: 14px; letter-spacing: .3px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.voice-controls-panel { padding-bottom: 20px; }
.voice-controls-panel .voice-panel-header { margin-bottom: 0; }
.voice-controls-panel > * { margin: 16px 20px 0; }
.voice-controls-panel .voice-panel-header { margin: 0; }

.field-label { display: block; font-size: 12px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 6px; }
.field-select {
  width: 100%; padding: 10px 12px; border-radius: var(--radius);
  background: var(--bg-surface); border: 1px solid var(--border);
  color: var(--text-primary); font-size: 14px; cursor: pointer;
  transition: border-color var(--transition);
}
.field-select:focus { outline: none; border-color: var(--border-focus); }

.recording-zone { text-align: center; padding: 20px 0; }
.record-btn {
  width: 80px; height: 80px; border-radius: 50%; border: none;
  background: linear-gradient(135deg, var(--primary), #818cf8);
  box-shadow: 0 0 0 0 var(--primary-glow);
  cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  transition: all var(--transition); margin: 0 auto 12px;
  font-weight: 600; font-size: 11px; color: white;
}
.record-btn:hover:not(:disabled) { transform: scale(1.06); box-shadow: 0 0 0 10px var(--primary-glow); }
.record-btn:disabled { background: var(--bg-surface); color: var(--text-muted); box-shadow: none; }
.record-btn.recording { background: linear-gradient(135deg, var(--danger), #f87171); box-shadow: 0 0 0 12px rgba(239,68,68,0.25); animation: recordPulse 1.5s ease-in-out infinite; }
.record-icon { font-size: 24px; }
.record-hint { font-size: 12px; color: var(--text-muted); }

.recording-pulse {
  width: 12px; height: 12px; border-radius: 50%; background: var(--danger);
  margin: 0 auto; opacity: 0;
}
.recording-pulse.active { opacity: 1; animation: dot-pulse 1s ease-in-out infinite; }
@keyframes dot-pulse { 0%,100%{transform:scale(1);opacity:1} 50%{transform:scale(1.6);opacity:.4} }
@keyframes recordPulse { 0%,100%{box-shadow:0 0 0 12px rgba(239,68,68,.25)} 50%{box-shadow:0 0 0 20px rgba(239,68,68,.05)} }

.audio-tip {
  display: flex; align-items: flex-start; gap: 8px;
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 10px 12px; font-size: 12px; color: var(--text-muted);
}
.tip-icon { flex-shrink: 0; margin-top: 1px; }

.situation-info-chip {
  background: rgba(99,102,241,0.12); border: 1px solid rgba(99,102,241,0.3);
  border-radius: var(--radius); padding: 10px 14px; font-size: 13px; color: var(--primary); font-weight: 600;
}
.turn-counter { font-size: 12px; font-weight: 500; color: var(--text-muted); background: var(--bg-glass); padding: 2px 8px; border-radius: 10px; }

/* Chat window */
.voice-chat-panel { display: flex; flex-direction: column; min-height: 460px; }
.chat-window { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 14px; max-height: 380px; }
.chat-welcome { display: flex; align-items: flex-start; gap: 10px; color: var(--text-muted); font-size: 14px; padding: 10px; }
.chat-welcome-icon { font-size: 22px; flex-shrink: 0; }

/* Chat bubbles */
.chat-msg { display: flex; gap: 10px; align-items: flex-start; animation: fadeInUp 0.3s ease; }
.chat-msg.user-msg { flex-direction: row-reverse; }
.chat-avatar { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; flex-shrink: 0; }
.ai-avatar { background: linear-gradient(135deg, var(--primary), var(--accent)); }
.user-avatar { background: var(--bg-elevated); border: 1px solid var(--border); }
.chat-bubble {
  max-width: 80%; padding: 12px 16px; border-radius: var(--radius);
  font-size: 14px; line-height: 1.55;
}
.ai-bubble { background: var(--bg-surface); border: 1px solid var(--border); border-radius: 4px var(--radius) var(--radius) var(--radius); }
.user-bubble { background: linear-gradient(135deg, var(--primary), #818cf8); color: white; border-radius: var(--radius) 4px var(--radius) var(--radius); }

.voice-loading { display: flex; align-items: center; gap: 10px; padding: 16px 20px; font-size: 13px; color: var(--text-muted); border-top: 1px solid var(--border); }

/* Progress / Mastery panel */
.mastery-empty {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 40px 20px; color: var(--text-muted); font-size: 13px; text-align: center;
}
.mastery-empty span { font-size: 32px; }
.mastery-list { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.mastery-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 12px; border-radius: var(--radius); font-size: 13px;
  background: var(--bg-glass); border: 1px solid var(--border);
  transition: all 0.4s ease;
}
.mastery-item.mastered { background: rgba(16,185,129,0.1); border-color: rgba(16,185,129,0.35); }
.mastery-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); flex-shrink: 0; }
.mastery-item.mastered .mastery-dot { background: var(--success); box-shadow: 0 0 8px var(--success); }
.mastery-word { font-weight: 600; flex: 1; }
.mastery-check { color: var(--success); font-size: 14px; }

.corrections-panel { margin: 0 16px 16px; border-top: 1px solid var(--border); padding-top: 14px; }
.corrections-title { font-size: 12px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 10px; }
.correction-item { background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.25); border-radius: var(--radius); padding: 10px 12px; font-size: 12px; margin-bottom: 8px; }
.correction-orig { color: var(--danger); text-decoration: line-through; margin-bottom: 4px; }
.correction-fix { color: var(--success); font-weight: 600; margin-bottom: 4px; }
.correction-why { color: var(--text-muted); }

/* ── FOOTER ───────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--border); padding: 40px 0; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.footer-brand { display: flex; align-items: center; gap: 8px; }
.footer-copy { font-size: 13px; color: var(--text-muted); text-align: center; }

/* ── ANIMATIONS ───────────────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.5s ease both; }