:root {
  --bg: #0a0b14;
  --bg-2: #10112052;
  --card: rgba(255,255,255,0.055);
  --card-border: rgba(255,255,255,0.10);
  --text: #f3f2fb;
  --text-dim: #a9a6c4;
  --text-mute: #75729a;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --accent-3: #f472b6;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ---------- animated aurora background ---------- */
.bg-aurora {
  position: fixed; inset: 0; z-index: -1; overflow: hidden;
  background: radial-gradient(1200px 800px at 10% -10%, #2a1454 0%, transparent 60%),
              radial-gradient(1000px 700px at 110% 10%, #0b2f4a 0%, transparent 55%),
              radial-gradient(900px 900px at 50% 120%, #3a0f3f 0%, transparent 60%),
              var(--bg);
}
.bg-aurora::before, .bg-aurora::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.55;
  animation: float 22s ease-in-out infinite alternate;
}
.bg-aurora::before {
  width: 480px; height: 480px; top: -120px; left: -120px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.bg-aurora::after {
  width: 520px; height: 520px; bottom: -160px; right: -100px;
  background: linear-gradient(135deg, var(--accent-3), var(--accent));
  animation-delay: -9s;
}
@keyframes float {
  from { transform: translate(0,0) scale(1); }
  to { transform: translate(60px, 40px) scale(1.15); }
}

a { color: inherit; text-decoration: none; }
.accent { background: linear-gradient(90deg, var(--accent-2), var(--accent), var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.muted { color: var(--text-mute); }

/* ---------- layout ---------- */
main { max-width: 980px; margin: 0 auto; padding: 24px 20px 80px; }
.page-enter { animation: pageIn .5s ease both; }
@keyframes pageIn { from { opacity: 0; transform: translateY(10px);} to { opacity:1; transform:none; } }

.topnav {
  display: flex; align-items: center; gap: 24px;
  padding: 16px 28px; position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(14px); background: rgba(10,11,20,0.65);
  border-bottom: 1px solid var(--card-border);
}
.brand { font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.topnav-links { display: flex; gap: 18px; flex: 1; }
.topnav-links a { color: var(--text-dim); font-weight: 600; font-size: 0.92rem; padding: 6px 2px; border-bottom: 2px solid transparent; }
.topnav-links a.active, .topnav-links a:hover { color: var(--text); border-color: var(--accent); }
.topnav-user { display: flex; align-items: center; gap: 14px; }
.level-pill {
  background: linear-gradient(90deg, rgba(139,92,246,.25), rgba(34,211,238,.2));
  border: 1px solid var(--card-border); padding: 6px 12px; border-radius: 999px; font-size: 0.82rem; font-weight: 600;
}
.logout-link { color: var(--text-mute); font-size: 0.85rem; }
.logout-link:hover { color: var(--text); }

.topnav-guest { justify-content: space-between; }
.topnav-guest-links { display: flex; align-items: center; gap: 18px; }
.topnav-guest-links a:not(.btn) { color: var(--text-dim); font-weight: 600; font-size: 0.92rem; }
.topnav-guest-links a:not(.btn):hover, .topnav-guest-links a.active:not(.btn) { color: var(--text); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ---------- cards & buttons ---------- */
.card {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; cursor: pointer; font-weight: 700; border-radius: 999px;
  padding: 11px 22px; font-size: 0.95rem; transition: transform .15s ease, box-shadow .15s ease, opacity .15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #0a0b14; box-shadow: 0 8px 24px -8px rgba(139,92,246,.6);
}
.btn-primary:hover { box-shadow: 0 10px 30px -6px rgba(139,92,246,.8); }
.btn-ghost { background: rgba(255,255,255,0.06); color: var(--text); border: 1px solid var(--card-border); }
.btn-ghost:hover { background: rgba(255,255,255,0.12); }
.btn-danger { background: linear-gradient(90deg, #f87171, #f472b6); color: #1a0505; }
.btn-lg { padding: 15px 30px; font-size: 1.02rem; }
.btn-block { width: 100%; }
.btn[hidden] { display: none; }

.chip {
  display: inline-block; padding: 4px 11px; border-radius: 999px; font-size: 0.78rem; font-weight: 600;
  background: rgba(255,255,255,0.08); border: 1px solid var(--card-border); color: var(--text-dim);
}
.chip-warn { background: rgba(251,191,36,0.15); color: var(--warn); border-color: rgba(251,191,36,0.3); }

.alert { background: rgba(248,113,113,0.12); border: 1px solid rgba(248,113,113,0.4); color: #ffd7d7;
  padding: 10px 14px; border-radius: var(--radius-sm); margin-bottom: 14px; font-size: 0.9rem; }
.alert-card { border-color: rgba(251,191,36,0.4); margin-bottom: 20px; }

/* ---------- hero / landing ---------- */
.hero { text-align: center; padding: 60px 10px 40px; }
.hero-badge { display:inline-block; padding: 6px 16px; border-radius: 999px; background: rgba(139,92,246,.15);
  border: 1px solid rgba(139,92,246,.3); font-size: 0.85rem; margin-bottom: 18px; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); margin: 0 0 14px; letter-spacing: -0.03em; }
.hero-sub { color: var(--text-dim); font-size: 1.1rem; max-width: 560px; margin: 0 auto 30px; line-height: 1.6; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 18px; margin-top: 30px; }
.feature-card { text-align: left; }
.feature-icon { font-size: 1.8rem; margin-bottom: 10px; }
.feature-card h3 { margin: 0 0 8px; font-size: 1.02rem; }
.feature-card p { margin: 0; color: var(--text-dim); font-size: 0.9rem; line-height: 1.5; }

/* ---------- auth ---------- */
.auth-wrap { display: flex; justify-content: center; padding-top: 40px; }
.auth-card { width: 100%; max-width: 400px; display: flex; flex-direction: column; gap: 14px; }
.auth-title { margin: 0; font-size: 1.6rem; }
.auth-sub { margin: -8px 0 4px; color: var(--text-dim); font-size: 0.9rem; }
.auth-card label { display: flex; flex-direction: column; gap: 6px; font-size: 0.85rem; color: var(--text-dim); font-weight: 600; }
.auth-card input {
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-border); border-radius: var(--radius-sm);
  padding: 11px 14px; color: var(--text); font-size: 0.95rem;
}
.auth-card input:focus { outline: 2px solid var(--accent); }
.auth-switch { text-align: center; font-size: 0.85rem; color: var(--text-dim); margin: 4px 0 0; }
.auth-switch a { color: var(--accent-2); font-weight: 600; }

/* ---------- dashboard ---------- */
.dash-hero { display: flex; gap: 30px; align-items: center; flex-wrap: wrap; margin-bottom: 30px; }
.level-ring {
  width: 110px; height: 110px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: conic-gradient(var(--accent) 0deg, var(--accent-2) calc(var(--pct,50) * 3.6deg), rgba(255,255,255,.08) 0deg);
  position: relative; flex-shrink: 0;
}
.level-ring::after { content:""; position:absolute; inset:8px; border-radius: 50%; background: var(--bg); }
.level-ring-num { position: relative; z-index: 1; font-size: 2.2rem; font-weight: 800; }
.dash-hero-right h1 { margin: 0 0 4px; font-size: 1.5rem; }
.tagline { color: var(--accent-2); font-weight: 600; margin: 0 0 8px; }
.desc { color: var(--text-dim); margin: 0 0 18px; max-width: 520px; line-height: 1.5; }
.dash-stats { display: flex; gap: 28px; margin-bottom: 20px; }
.stat { display: flex; flex-direction: column; }
.stat-num { font-size: 1.6rem; font-weight: 800; }
.stat-label { font-size: 0.78rem; color: var(--text-mute); text-transform: uppercase; letter-spacing: 0.04em; }

.recent-wrap h2 { font-size: 1.1rem; margin-bottom: 14px; }
.session-list { display: flex; flex-direction: column; gap: 10px; }
.session-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 20px;
  transition: transform .15s, border-color .15s; flex-wrap: wrap; }
.session-row:hover { transform: translateY(-2px); border-color: var(--accent); }
.session-topic { font-weight: 700; flex: 1 1 260px; }
.session-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.session-date { color: var(--text-mute); font-size: 0.8rem; }
.score-badge {
  display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #0a0b14; font-weight: 800;
}
.empty-state { text-align: center; display: flex; flex-direction: column; gap: 14px; align-items: center; }
.link-more { display: inline-block; margin-top: 14px; color: var(--accent-2); font-weight: 600; font-size: 0.88rem; }

/* ---------- setup ---------- */
.setup-wrap h1 { margin-bottom: 4px; }
.setup-sub { color: var(--text-dim); margin-top: 0; margin-bottom: 24px; }
.setup-card { display: flex; flex-direction: column; gap: 26px; }
.mode-fields { display: flex; flex-direction: column; gap: 26px; }
.field-group h3 { margin: 0 0 12px; font-size: 0.95rem; }
.choice-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.choice-btn {
  background: rgba(255,255,255,0.05); border: 1px solid var(--card-border); color: var(--text-dim);
  padding: 9px 16px; border-radius: 999px; cursor: pointer; font-weight: 600; font-size: 0.88rem; transition: all .15s;
}
.choice-btn:hover { border-color: var(--accent); color: var(--text); }
.choice-btn.selected { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #0a0b14; border-color: transparent; }
.choice-custom { display: flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--text-mute); }
.choice-custom input { width: 72px; background: rgba(255,255,255,.06); border: 1px solid var(--card-border);
  border-radius: 8px; padding: 6px 8px; color: var(--text); }

/* ---------- prep ---------- */
.prep-wrap { display: flex; justify-content: center; }
.prep-card { max-width: 640px; width: 100%; display: flex; flex-direction: column; gap: 16px; }
.prep-topic { font-size: 1.5rem; margin: 4px 0 0; line-height: 1.35; }
.guiding-box { background: rgba(255,255,255,0.04); border-radius: var(--radius-sm); padding: 14px 18px; }
.guiding-box h3 { margin: 0 0 8px; font-size: 0.85rem; color: var(--text-dim); }
.guiding-box ul { margin: 0; padding-left: 18px; color: var(--text-dim); line-height: 1.6; font-size: 0.9rem; }
.notes-details summary { cursor: pointer; font-size: 0.88rem; color: var(--accent-2); font-weight: 600; }
.notes-details textarea {
  width: 100%; margin-top: 10px; background: rgba(255,255,255,0.05); border: 1px solid var(--card-border);
  border-radius: var(--radius-sm); padding: 10px 12px; color: var(--text); font-family: inherit; resize: vertical;
}
.prep-swap-form { margin: 0; }
.prep-timer-area { text-align: center; margin-top: 6px; }

/* ---------- record ---------- */
.record-wrap { display: flex; justify-content: center; position: relative; }
.record-card { max-width: 560px; width: 100%; text-align: center; display: flex; flex-direction: column; gap: 18px; align-items: center; }
.record-topic { font-size: 1.2rem; font-weight: 700; }
.mic-orb {
  width: 130px; height: 130px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 2.6rem; background: radial-gradient(circle at 30% 30%, rgba(139,92,246,.5), rgba(34,211,238,.25));
  position: relative; border: 1px solid var(--card-border);
}
.mic-orb-ring {
  position: absolute; inset: -10px; border-radius: 50%; border: 2px solid var(--accent); opacity: 0;
}
.mic-orb.live .mic-orb-ring { animation: pulseRing 1.4s ease-out infinite; }
@keyframes pulseRing { 0% { opacity:.8; transform: scale(0.9);} 100% { opacity:0; transform: scale(1.35);} }
.waveform { display: flex; align-items: flex-end; gap: 3px; height: 46px; }
.wf-bar { width: 4px; height: 6px; background: linear-gradient(180deg, var(--accent-2), var(--accent)); border-radius: 3px; transition: height .08s ease; }
.record-timer { font-size: 2.4rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.record-controls { display: flex; gap: 12px; }
.record-hint { color: var(--text-mute); font-size: 0.85rem; margin: 0; }
.processing-overlay {
  position: fixed; inset: 0; background: rgba(10,11,20,0.85); backdrop-filter: blur(6px);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; z-index: 50;
}
.spinner { width: 46px; height: 46px; border-radius: 50%; border: 4px solid rgba(255,255,255,0.15);
  border-top-color: var(--accent-2); animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- result ---------- */
.result-header { display: flex; gap: 26px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.score-gauge { position: relative; width: 120px; height: 120px; flex-shrink: 0; }
.score-gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.gauge-bg { fill: none; stroke: rgba(255,255,255,0.08); stroke-width: 10; }
.gauge-fg { fill: none; stroke: url(#none); stroke: var(--accent-2); stroke-width: 10; stroke-linecap: round;
  stroke-dasharray: 327; stroke-dashoffset: 327; transition: stroke-dashoffset 1s ease; }
.gauge-num { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; font-weight: 800; }
.result-header-text h1 { margin: 0 0 6px; font-size: 1.4rem; }
.result-topic { color: var(--text-dim); margin: 0 0 10px; font-style: italic; }
.result-meta-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.level-feedback { color: var(--text-dim); margin: 0; line-height: 1.5; max-width: 560px; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.bullet-list { margin: 0; padding-left: 18px; line-height: 1.7; }
.vocab-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 14px; margin-top: 14px; }
.vocab-card { background: rgba(255,255,255,0.04); border-radius: var(--radius-sm); padding: 14px; }
.vocab-swap { font-weight: 700; margin-bottom: 6px; }
.vocab-basic { color: var(--text-mute); text-decoration: line-through; }
.vocab-upgrade { color: var(--accent-2); }
.vocab-example { margin: 0; color: var(--text-dim); font-size: 0.88rem; font-style: italic; }
.grammar-list { display: flex; flex-direction: column; gap: 14px; margin-top: 14px; }
.grammar-item del { color: var(--bad); }
.grammar-item ins { color: var(--good); text-decoration: none; font-weight: 700; }
.grammar-explain { margin: 4px 0 0; color: var(--text-mute); font-size: 0.85rem; }
.transcript-details { margin-top: 18px; }
.transcript-details summary { cursor: pointer; font-weight: 700; }
.transcript-text { color: var(--text-dim); line-height: 1.7; margin-top: 12px; white-space: pre-wrap; }
.level-progress-card { margin-top: 18px; }
.result-actions { display: flex; gap: 14px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }

/* ---------- history ---------- */
.history-wrap h1 { margin-bottom: 18px; }
.chart-card { margin-bottom: 18px; }
.history-filters { display: flex; gap: 10px; margin-bottom: 18px; }
.history-filters select { background: rgba(255,255,255,.06); border: 1px solid var(--card-border); color: var(--text);
  padding: 9px 12px; border-radius: var(--radius-sm); font-size: 0.88rem; }

/* ---------- setup extras (mode, custom topic, interview) ---------- */
.text-input {
  width: 100%; background: rgba(255,255,255,0.05); border: 1px solid var(--card-border);
  border-radius: var(--radius-sm); padding: 11px 14px; color: var(--text); font-size: 0.95rem; font-family: inherit;
}
.info-box { background: rgba(139,92,246,0.08); border-color: rgba(139,92,246,0.25); }
.info-box p { margin: 0; color: var(--text-dim); font-size: 0.9rem; line-height: 1.5; }

/* ---------- shadowing passage ---------- */
.passage-box {
  background: rgba(255,255,255,0.04); border-radius: var(--radius-sm); padding: 18px 20px;
  font-size: 1.1rem; line-height: 1.7; color: var(--text);
}
.passage-box-record { font-size: 1rem; max-height: 160px; overflow-y: auto; text-align: left; }

/* ---------- shadowing diff render ---------- */
.diff-legend { display: inline-flex; align-items: center; gap: 5px; font-size: 0.8rem; margin-right: 14px; }
.diff-legend::before { content: ""; width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.diff-legend.diff-match::before { background: var(--good); }
.diff-legend.diff-missing::before { background: var(--bad); }
.diff-legend.diff-extra::before { background: var(--warn); }
.diff-render { line-height: 2.1; font-size: 1.05rem; }
.diff-match { color: var(--text); }
.diff-missing { color: var(--bad); text-decoration: line-through; opacity: 0.8; }
.diff-extra { color: var(--warn); }

/* ---------- interview turns ---------- */
.interview-turns { display: flex; flex-direction: column; gap: 16px; margin-top: 12px; }
.interview-turn { background: rgba(255,255,255,0.04); border-radius: var(--radius-sm); padding: 14px 18px; }
.interview-q { font-weight: 700; margin: 0 0 6px; color: var(--accent-2); }
.interview-a { margin: 0; color: var(--text-dim); line-height: 1.6; }

/* ---------- vocab flashcards ---------- */
.vocab-wrap h1 { margin-bottom: 4px; }
.flashcard-deck { display: flex; justify-content: center; }
.flashcard, .flashcard-done {
  max-width: 440px; width: 100%; text-align: center; display: flex; flex-direction: column;
  align-items: center; gap: 16px; padding: 40px 30px;
}
.flashcard-word { font-size: 1.8rem; font-weight: 800; margin: 0; }
.flashcard-back { display: flex; flex-direction: column; gap: 8px; }
.flashcard-upgrade { font-size: 1.3rem; font-weight: 700; color: var(--accent-2); margin: 0; }
.flashcard-example { color: var(--text-dim); font-style: italic; margin: 0; }
.flashcard-actions { display: flex; gap: 12px; }

/* ---------- leaderboard ---------- */
.leaderboard-table { width: 100%; border-collapse: collapse; }
.leaderboard-table th { text-align: left; color: var(--text-mute); font-size: 0.78rem; text-transform: uppercase;
  letter-spacing: 0.04em; padding: 8px 10px; border-bottom: 1px solid var(--card-border); }
.leaderboard-table td { padding: 12px 10px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.leaderboard-me { background: rgba(139,92,246,0.08); }

@media (max-width: 720px) {
  .topnav { flex-wrap: wrap; gap: 10px; }
  .topnav-links { order: 3; width: 100%; }
  .result-grid { grid-template-columns: 1fr; }
  .dash-hero { flex-direction: column; text-align: center; }
  .dash-stats { justify-content: center; }
}