/* =========================================
   Twelve Labs — Design tokens
   Editorial paper/ink direction: warm neutrals,
   hairline borders, tight tracking, mono numerals.
   ========================================= */

:root {
    color-scheme: dark;
    --bg: #131211;
    --bg-elevated: #1a1815;
    --card: #1c1a17;
    --card-hover: #211f1b;

    --border: rgba(245, 242, 235, 0.12);
    --border-soft: rgba(245, 242, 235, 0.07);
    --border-strong: rgba(245, 242, 235, 0.24);

    --text: #f2efe8;
    --text-dim: #a39d92;
    --text-faint: #726c62;

    --accent: #86a894;
    --accent-strong: #9fbdac;
    --accent-ink: #0f1210;
    --accent-wash: rgba(134, 168, 148, 0.12);

    --danger: #d98b73;
    --danger-wash: rgba(217, 139, 115, 0.1);

    --radius-s: 6px;
    --radius-m: 10px;
    --radius-l: 14px;

    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --fast: 0.15s ease;
    --base: 0.2s ease;

    --serif: "Fraunces", Georgia, "Times New Roman", serif;
    --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

[data-theme="light"] {
    color-scheme: light;
    --bg: #f4f0e7;
    --bg-elevated: #fffdf7;
    --card: #fffdf7;
    --card-hover: #faf6ee;

    --border: rgba(24, 21, 15, 0.12);
    --border-soft: rgba(24, 21, 15, 0.07);
    --border-strong: rgba(24, 21, 15, 0.22);

    --text: #19160f;
    --text-dim: #6b6457;
    --text-faint: #948c7c;

    --accent: #3e6b52;
    --accent-strong: #2f5641;
    --accent-ink: #f4f0e7;
    --accent-wash: rgba(62, 107, 82, 0.08);

    --danger: #b6503a;
    --danger-wash: rgba(182, 80, 58, 0.07);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { margin: 0; }

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
    transition: background-color var(--base), color var(--base);
}

button, select, input, textarea { font: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* --- Shell --- */
.shell {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 18px 24px 26px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- Topbar --- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    min-height: 44px;
    padding-bottom: 14px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-soft);
}

.wordmark {
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: -0.03em;
    color: var(--text);
    text-decoration: none;
}

.wordmark span { color: var(--text-faint); font-weight: 500; }
.wordmark h3 { margin: 0; }

.theme-toggle {
    display: inline-grid;
    place-items: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    background: var(--card);
    color: var(--text);
    cursor: pointer;
    transition: border-color var(--fast), transform var(--fast);
}

.theme-toggle:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* --- Hero --- */
.hero { margin-bottom: 24px; }

.hero-kicker {
    margin: 0 0 10px;
    color: var(--accent-strong);
    font-family: var(--mono);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.14em;
}

.hero-title {
    font-weight: 200;
    letter-spacing: -0.045em;
    line-height: 0.98;
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    color: var(--text);
    margin: 0 0 14px;
    max-width: 25ch;
}

.hero-sub {
    margin: 0;
    max-width: 42ch;
    color: var(--text-dim);
    font-size: 1rem;
    line-height: 1.65;
}

/* --- Feature strip --- */
.feature-strip {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px solid var(--border-soft);
}

.feature-item {
    display: flex;
    gap: 10px;
    min-width: 0;
}

.feature-number {
    flex-shrink: 0;
    color: var(--accent-strong);
    font-family: var(--mono);
    font-size: 0.68rem;
    padding-top: 2px;
}

.feature-item h2 {
    margin: 0 0 4px;
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 600;
}

.feature-item p {
    margin: 0;
    color: var(--text-faint);
    font-size: 0.72rem;
    line-height: 1.45;
}

/* --- Studio card --- */
.studio { flex: 1; }

.studio-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-l);
    min-height: 410px;
    padding: 20px 24px 22px;
    transition: border-color var(--base), box-shadow var(--base);
}

.studio-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 24px;
    align-items: stretch;
    min-height: 366px;
}

.input-panel,
.output-panel {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.output-panel {
    display: flex;
    flex-direction: column;
    padding-left: 24px;
    border-left: 1px solid var(--border-soft);
}

.output-area { flex: 1; }

.input-panel .studio-input {
    flex: 1;
    min-height: 170px;
}

.input-panel .studio-toolbar {
    margin-top: 12px;
}

.output-panel .output-area {
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.output-panel .empty-state,
.output-panel .player,
.output-panel .error-state {
    flex: 1;
}

.studio-card.loading {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent-wash);
}

.studio-note {
    margin: 16px 0 0;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-faint);
}

/* --- Textarea --- */
.studio-input {
    width: 100%;
    min-height: 92px;
    max-height: 280px;
    resize: vertical;
    padding: 16px 0 8px;
    background: transparent;
    border: none;
    color: var(--text);
    font-family: var(--sans);
    font-size: 1.02rem;
    line-height: 1.65;
    text-align: left;
    outline: none;
}

.studio-input::placeholder { color: var(--text-faint); }

.studio-metabar {
    display: flex;
    justify-content: space-between;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-soft);
}

.editor-stats {
    display: flex;
    gap: 12px;
    align-items: center;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-faint);
}

.editor-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 30px;
    padding-top: 6px;
}

.text-action {
    padding: 3px 0;
    border: 0;
    background: transparent;
    color: var(--accent-strong);
    font-size: 0.74rem;
    font-weight: 600;
    cursor: pointer;
}

.text-action:hover { color: var(--accent); text-decoration: underline; }
.text-action-quiet { color: var(--text-faint); font-weight: 500; }

.char-counter {
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-faint);
    letter-spacing: -0.01em;
}

.char-counter.warning { color: #c99a4a; }
.char-counter.danger { color: var(--danger); }

/* --- Toolbar --- */
.studio-toolbar {
    display: grid;
    grid-template-columns: 1.3fr 0.85fr 0.85fr 0.85fr auto;
    gap: 12px;
    align-items: end;
    padding-top: 14px;
}

.field label {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 6px;
}

.field label span {
    font-family: var(--mono);
    font-weight: 500;
    letter-spacing: -0.01em;
    text-transform: none;
    color: var(--text-dim);
}

.select-wrapper { position: relative; }

.select-wrapper select {
    width: 100%;
    padding: 9px 30px 9px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    color: var(--text);
    font-size: 0.85rem;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition: border-color var(--fast);
}

.select-wrapper select:hover,
.select-wrapper select:focus { border-color: var(--border-strong); }

.select-wrapper select option { background: var(--card); color: var(--text); }

.select-arrow {
    position: absolute;
    right: 11px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-faint);
}

.voice-hint {
    font-size: 0.74rem;
    color: var(--text-faint);
    margin: 6px 0 0;
    min-height: 14px;
}

/* --- Dial sliders --- */
.dial {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 2px;
    border-radius: 1px;
    background: var(--border);
    outline: none;
    cursor: pointer;
}

.dial::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 0 3px var(--accent-wash);
    transition: transform var(--fast);
}

.dial::-webkit-slider-thumb:hover { transform: scale(1.15); }

.dial::-moz-range-thumb {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--accent);
    border: none;
    cursor: pointer;
}

/* --- Generate button --- */
.generate-btn {
    height: 38px;
    padding: 0 20px;
    border: 1px solid var(--accent);
    border-radius: var(--radius-s);
    background: var(--accent);
    color: var(--accent-ink);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--fast), background-color var(--fast), border-color var(--fast);
    white-space: nowrap;
}

.generate-btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); transform: translateY(-1px); }
.generate-btn:active { transform: translateY(0); }
.generate-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-content, .btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 12px;
    height: 12px;
    border: 2px solid rgba(15, 18, 16, 0.25);
    border-top-color: var(--accent-ink);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* --- Output area --- */
.output-area { margin-top: 16px; }

.empty-state {
    padding: 20px 4px 4px;
    text-align: center;
    border-top: 1px solid var(--border-soft);
}

.empty-state p { font-size: 0.84rem; color: var(--text-faint); }

/* --- Player --- */
.player { padding-top: 14px; border-top: 1px solid var(--border-soft); }

.waveform-wrap {
    width: 100%;
    height: 64px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-m);
    overflow: hidden;
    margin-bottom: 10px;
}

#waveformCanvas { width: 100%; height: 100%; display: block; }

.transport {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.play-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: var(--accent-ink);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--fast);
}

.play-btn:hover { transform: scale(1.05); }
.play-btn .icon-play { margin-left: 2px; }

.time-display {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-faint);
    min-width: 32px;
    text-align: center;
}

.progress-bar-wrap {
    flex: 1;
    height: 2px;
    background: var(--border);
    border-radius: 1px;
    cursor: pointer;
    position: relative;
}

.progress-bar { height: 100%; border-radius: 1px; background: var(--accent); width: 0%; transition: width 0.1s linear; }

.progress-knob {
    position: absolute;
    top: 50%;
    left: 0%;
    transform: translate(-50%, -50%) scale(0);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent);
    transition: transform var(--fast);
}

.progress-bar-wrap:hover .progress-knob { transform: translate(-50%, -50%) scale(1); }

.player-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    padding-top: 14px;
    border-top: 1px solid var(--border-soft);
}

.meta-row {
    display: flex;
    gap: 14px;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-faint);
}

.download-row { display: flex; gap: 8px; }

.download-btn {
    padding: 7px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    background: var(--bg-elevated);
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color var(--fast), color var(--fast), transform var(--fast);
}

.download-btn:hover { border-color: var(--accent); color: var(--accent-strong); transform: translateY(-1px); }
.download-btn-ghost { color: var(--text-dim); }

/* --- Error state --- */
.error-state { padding: 28px 4px 6px; text-align: center; border-top: 1px solid var(--border-soft); }

.error-state p { font-size: 0.84rem; color: var(--text-dim); margin: 0 0 14px; }

.retry-btn {
    padding: 8px 18px;
    border: 1px solid var(--danger);
    border-radius: var(--radius-s);
    background: var(--danger-wash);
    color: var(--danger);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--fast);
}

.retry-btn:hover { transform: translateY(-1px); }

/* --- Footer --- */
.foot { text-align: center; padding-top: 24px; margin-top: auto; }
.foot p { font-size: 0.72rem; color: var(--text-faint); }

/* --- 404 page --- */
.notfound-shell {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px;
}

.notfound-code {
    font-weight: 400;
    letter-spacing: -0.04em;
    font-size: clamp(4rem, 16vw, 6.5rem);
    color: var(--text-faint);
    line-height: 1;
    margin-bottom: 8px;
}

.notfound-title {
    font-weight: 600;
    letter-spacing: -0.02em;
    font-size: 1.35rem;
    color: var(--text);
    margin-bottom: 10px;
}

.notfound-text {
    font-size: 0.88rem;
    color: var(--text-dim);
    max-width: 360px;
    line-height: 1.65;
    margin-bottom: 26px;
}

.notfound-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid var(--accent);
    border-radius: var(--radius-s);
    background: var(--accent);
    color: var(--accent-ink);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color var(--fast), border-color var(--fast);
}

.notfound-home:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

/* --- Responsive --- */
@media (max-width: 640px) {
    .shell { padding: 16px 16px 22px; }
    .topbar { margin-bottom: 20px; }
    .studio-card { min-height: auto; padding: 2px 16px 14px; }
    .studio-layout { grid-template-columns: 1fr; gap: 18px; min-height: auto; }
    .input-panel .studio-input { min-height: 150px; }
    .output-panel { padding-left: 0; border-left: 0; border-top: 1px solid var(--border-soft); padding-top: 4px; }
    .feature-strip { grid-template-columns: 1fr; gap: 10px; margin-top: 20px; padding-top: 14px; }
    .editor-stats { gap: 8px; font-size: 0.66rem; }
    .studio-toolbar { grid-template-columns: 1fr 1fr; }
    .field-voice { grid-column: 1 / -1; }
    .generate-btn { grid-column: 1 / -1; height: 42px; }
    .player-footer { flex-direction: column; align-items: flex-start; }
}

/* --- Accessibility --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

::selection { background: var(--accent-wash); color: var(--text); }