:root {
            color-scheme: dark;
            --bg: #05080d;
            --bg-secondary: #0a1119;
            --panel: rgba(12, 19, 29, 0.88);
            --panel-strong: rgba(15, 24, 37, 0.94);
            --panel-soft: rgba(255, 255, 255, 0.04);
            --border: rgba(255, 255, 255, 0.1);
            --border-strong: rgba(255, 255, 255, 0.16);
            --text: #f5f7fa;
            --text-soft: rgba(245, 247, 250, 0.76);
            --text-faint: rgba(245, 247, 250, 0.56);
            --brand: #00c781;
            --brand-soft: rgba(0, 199, 129, 0.16);
            --brand-strong: #00e38f;
            --danger: #ff6b6b;
            --warning: #ff9d2f;
            --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
            --radius-lg: 24px;
            --radius-md: 16px;
            --radius-sm: 12px;
            --overlay-1: rgba(255, 255, 255, 0.03);
            --overlay-2: rgba(255, 255, 255, 0.06);
            --overlay-3: rgba(255, 255, 255, 0.12);
            --surface-deep: rgba(15, 24, 37, 0.94);
            --bg-gradient: linear-gradient(180deg, #08111a 0%, #05080d 34%, #030508 100%);
            --bg-glow-1: radial-gradient(circle at top right, rgba(0, 199, 129, 0.14), transparent 30%);
            --bg-glow-2: radial-gradient(circle at top left, rgba(98, 154, 255, 0.12), transparent 24%);
            --brand-text: #a7ffd7;
            --warning-text: #ffd194;
            --refining-text: #bad4ff;
            --recording-banner-bg: linear-gradient(90deg, rgba(255, 157, 47, 0.92), rgba(255, 107, 107, 0.92));
            --recording-banner-bg-paused: linear-gradient(90deg, rgba(255, 216, 107, 0.95), rgba(255, 183, 77, 0.95));
        }

        [data-theme="light"] {
            color-scheme: light;
            --bg: #f5f7fa;
            --bg-secondary: #e2e8f0;
            --panel: rgba(255, 255, 255, 0.92);
            --panel-strong: rgba(248, 250, 252, 0.96);
            --panel-soft: rgba(15, 23, 42, 0.04);
            --border: rgba(15, 23, 42, 0.1);
            --border-strong: rgba(15, 23, 42, 0.16);
            --text: #0f172a;
            --text-soft: rgba(15, 23, 42, 0.76);
            --text-faint: rgba(15, 23, 42, 0.56);
            --brand: #00c781;
            --brand-soft: rgba(0, 199, 129, 0.12);
            --brand-strong: #00b070;
            --danger: #c53030;
            --warning: #c4730a;
            --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
            --overlay-1: rgba(15, 23, 42, 0.03);
            --overlay-2: rgba(15, 23, 42, 0.05);
            --overlay-3: rgba(15, 23, 42, 0.12);
            --surface-deep: rgba(248, 250, 252, 0.96);
            --bg-gradient: linear-gradient(180deg, #ffffff 0%, #e2e8f0 50%, #d4dae3 100%);
            --bg-glow-1: radial-gradient(circle at top right, rgba(0, 199, 129, 0.06), transparent 30%);
            --bg-glow-2: radial-gradient(circle at top left, rgba(98, 154, 255, 0.06), transparent 24%);
            --brand-text: #007a5f;
            --warning-text: #b35900;
            --refining-text: #2563eb;
            /* Slightly desaturated recording banner for light mode — softer on light
               backgrounds while retaining the orange→red urgency cue for safety. */
            --recording-banner-bg: linear-gradient(90deg, rgba(217, 119, 6, 0.95), rgba(190, 18, 60, 0.95));
            --recording-banner-bg-paused: linear-gradient(90deg, rgba(202, 138, 4, 0.95), rgba(180, 83, 9, 0.95));
        }

        * {
            box-sizing: border-box;
        }

        html,
        body {
            min-height: 100%;
            margin: 0;
            background: var(--bg-glow-1), var(--bg-glow-2), var(--bg-gradient);
            color: var(--text);
            font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        }

        body {
            padding: 32px 20px 24px;
        }

        button,
        select,
        input {
            font: inherit;
        }

        button,
        select {
            min-height: 44px;
            padding: 11px 15px;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: var(--overlay-2);
            color: var(--text);
            cursor: pointer;
            outline: none;
            transition: background 160ms ease, border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
            white-space: nowrap;
        }

        button:hover,
        select:hover,
        details summary:hover {
            border-color: var(--border-strong);
            background: var(--overlay-3);
        }

        button:focus-visible,
        select:focus-visible,
        input:focus-visible,
        details summary:focus-visible {
            outline: 2px solid rgba(0, 199, 129, 0.4);
            outline-offset: 2px;
        }

        button:disabled {
            opacity: 0.45;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        option {
            background: #091119;
            color: var(--text);
        }

        input {
            min-height: 46px;
            padding: 12px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            background: var(--overlay-2);
            color: var(--text);
            min-width: 220px;
            outline: none;
        }

        input::placeholder {
            color: rgba(245, 247, 250, 0.46);
        }

        [data-theme="light"] input::placeholder {
            color: rgba(0, 0, 0, 0.35);
        }

        .btn-primary {
            border-color: rgba(0, 199, 129, 0.45);
            background: linear-gradient(135deg, rgba(0, 199, 129, 0.28), rgba(0, 199, 129, 0.14));
            box-shadow: 0 10px 28px rgba(0, 199, 129, 0.18);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, rgba(0, 199, 129, 0.38), rgba(0, 199, 129, 0.18));
            border-color: rgba(0, 227, 143, 0.65);
        }

        .btn-secondary {
            background: var(--overlay-2);
        }

        .app-shell {
            max-width: 1640px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 22px;
        }

        .topbar {
            display: grid;
            grid-template-columns: minmax(0, 1.9fr) minmax(320px, 0.9fr);
            gap: 20px;
            align-items: stretch;
        }

        .hero-card,
        .wave-card,
        .controls,
        .collapsible-panel,
        .translation-box,
        .history-panel,
        .export-card,
        .record-modal-card {
            border: 1px solid var(--border);
            background: var(--panel);
            box-shadow: var(--shadow);
            backdrop-filter: blur(16px);
        }

        .hero-card {
            position: relative;
            overflow: hidden;
            border-radius: 28px;
            padding: 28px;
            background:
                linear-gradient(135deg, rgba(0, 199, 129, 0.12), transparent 36%),
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--panel-strong);
        }

        .hero-card::after {
            content: "";
            position: absolute;
            inset: auto 0 0 0;
            height: 4px;
            background: linear-gradient(90deg, var(--brand), rgba(0, 227, 143, 0.12));
        }

        .hero-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
            color: var(--text-soft);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.14em;
            text-transform: uppercase;
        }

        .hero-eyebrow::before {
            content: "";
            width: 36px;
            height: 3px;
            border-radius: 999px;
            background: var(--brand);
            box-shadow: 0 0 18px rgba(0, 199, 129, 0.35);
        }

        .hero-brand {
            display: flex;
            align-items: center;
            gap: 18px;
            margin-bottom: 0px;
        }

        .hero-logo {
            width: 64px;
            height: 64px;
            flex: 0 0 auto;
            border-radius: 18px;
            box-shadow: 0 16px 36px rgba(0, 0, 0, 0.28);
        }

        .hero-brand-copy {
            min-width: 0;
        }

        h3 {
            margin: 0;
            font-size: clamp(30px, 4vw, 44px);
            line-height: 1.05;
            letter-spacing: -0.03em;
            max-width: 14ch;
        }

        .hero-subtitle {
            margin: 14px 0 0;
            max-width: 66ch;
            color: var(--text-soft);
            font-size: 15px;
            line-height: 1.6;
        }

        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 22px;
        }

        .previous-room-note {
            margin-top: 14px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            color: var(--text-soft);
            font-size: 13px;
        }

        .previous-room-note strong {
            color: var(--text);
            letter-spacing: 0.02em;
        }

        .hero-chip,
        #status {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            min-height: 38px;
            padding: 0 14px;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: var(--overlay-2);
            color: var(--text-soft);
            font-size: 13px;
            font-weight: 600;
        }

        #status::before,
        .hero-chip::before {
            content: "";
            width: 8px;
            height: 8px;
            border-radius: 999px;
            background: var(--text-soft);
        }

        #status[data-tone="ready"]::before {
            background: #77d67a;
            box-shadow: 0 0 0 4px rgba(119, 214, 122, 0.16);
        }

        #status[data-tone="live"]::before,
        #status[data-tone="connected"]::before {
            background: var(--brand);
            box-shadow: 0 0 0 4px rgba(0, 199, 129, 0.18);
        }

        #status[data-tone="warning"]::before {
            background: var(--warning);
            box-shadow: 0 0 0 4px rgba(255, 157, 47, 0.18);
        }

        #status[data-tone="error"]::before {
            background: var(--danger);
            box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.18);
        }

        .wave-card {
            border-radius: 24px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            gap: 18px;
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--panel-strong);
        }

        .wave-card-label {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            color: var(--text-faint);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }

        .wave-card-label span:last-child {
            color: inherit;
            font-size: inherit;
        }

        #waveCanvas {
            width: 100%;
            height: 132px;
            border-radius: 18px;
            border: 1px solid var(--overlay-3);
            background:
                linear-gradient(180deg, rgba(0, 199, 129, 0.06), var(--overlay-1)),
                rgba(0, 0, 0, 0.18);
        }

        .controls {
            border-radius: var(--radius-lg);
            padding: 22px;
            position: relative;
            z-index: 20;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .collapsible-panel {
            border-radius: var(--radius-lg);
            position: relative;
            z-index: 1;
        }

        .collapsible-summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            color: var(--text-soft);
            font-weight: 600;
        }

        .collapsible-summary-main {
            min-width: 0;
            flex: 1 1 auto;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .collapsible-title {
            color: var(--text);
            font-size: 20px;
            line-height: 1.2;
        }

        .collapsible-meta {
            color: var(--text-faint);
            font-size: 13px;
            line-height: 1.5;
        }

        .collapsible-panel[open]>.collapsible-summary {
            border-bottom: 1px solid var(--overlay-2);
        }

        .collapsible-body {
            padding: 0 22px 22px;
        }

        .controls-panel {
            z-index: 20;
        }

        .controls-panel .collapsible-body {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .panel-heading {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            align-items: center;
        }

        .panel-heading h4,
        .translation-heading h4 {
            margin: 4px 0 0;
            font-size: 20px;
        }

        .panel-label,
        .translation-label {
            color: var(--text-faint);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.12em;
            text-transform: uppercase;
        }

        .controls-row {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
        }

        .controls-row.select-row select,
        .controls-row.buttons-row button,
        .controls-row.buttons-row select {
            flex: 0 0 auto;
        }

        .controls-row.select-row>.field-group {
            margin-top: 10px;
        }

        .field-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
            min-width: 180px;
        }

        .language-field {
            position: relative;
            min-width: 240px;
        }

        .language-field[data-open="true"] {
            z-index: 80;
        }

        .field-group label {
            color: var(--text-faint);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .language-trigger {
            width: 100%;
            min-height: 68px;
            padding: 12px 16px;
            border-radius: 20px;
            justify-content: space-between;
            align-items: center;
            gap: 14px;
            white-space: normal;
            text-align: left;
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--overlay-2);
        }

        .language-field[data-open="true"] .language-trigger {
            border-color: rgba(0, 199, 129, 0.35);
            background:
                linear-gradient(180deg, rgba(0, 199, 129, 0.08), var(--overlay-1)),
                var(--surface-deep);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
        }

        .language-trigger-copy {
            display: flex;
            flex-direction: column;
            gap: 4px;
            min-width: 0;
        }

        .language-trigger-label {
            font-size: 15px;
            font-weight: 700;
            color: var(--text);
        }

        .language-trigger-meta {
            color: var(--text-faint);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }

        .language-trigger-caret {
            color: var(--brand-strong);
            font-size: 18px;
            line-height: 1;
            transition: transform 160ms ease;
        }

        .language-field[data-open="true"] .language-trigger-caret {
            transform: rotate(180deg);
        }

        .language-picker {
            position: absolute;
            top: calc(100% + 10px);
            left: 0;
            width: max(100%, 320px);
            border-radius: 22px;
            border: 1px solid var(--overlay-3);
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--surface-deep);
            box-shadow: 0 22px 70px rgba(0, 0, 0, 0.4);
            backdrop-filter: blur(20px);
            z-index: 120;
            overflow: hidden;
        }

        .language-picker-head {
            padding: 12px;
            border-bottom: 1px solid var(--overlay-2);
        }

        .language-search {
            width: 100%;
            min-width: 0;
        }

        .language-picker-body {
            max-height: 340px;
            overflow: auto;
            padding: 12px;
            display: block;
        }

        .language-option-list {
            display: grid;
            gap: 6px;
        }

        .language-option {
            width: 100%;
            min-height: 0;
            padding: 12px 14px;
            border-radius: 16px;
            border: 1px solid var(--overlay-3);
            background: var(--overlay-1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 14px;
            white-space: normal;
            text-align: left;
        }

        .language-option-main {
            display: flex;
            flex-direction: column;
            gap: 4px;
            min-width: 0;
        }

        .language-option-label {
            color: var(--text);
            font-size: 14px;
            font-weight: 700;
        }

        .language-option-native {
            color: var(--text-faint);
            font-size: 12px;
        }

        .language-option.is-rtl .language-option-native {
            direction: rtl;
            text-align: right;
        }

        .language-option-code {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 26px;
            padding: 0 10px;
            border-radius: 999px;
            border: 1px solid var(--overlay-3);
            background: var(--overlay-2);
            color: var(--text-soft);
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .language-option[aria-selected="true"] {
            border-color: rgba(0, 199, 129, 0.36);
            background:
                linear-gradient(180deg, rgba(0, 199, 129, 0.12), var(--overlay-1)),
                var(--surface-deep);
        }

        .language-empty {
            padding: 8px 4px 2px;
            color: var(--text-faint);
            font-size: 13px;
        }

        .controls-row.select-row select,
        #micSelect {
            min-width: 180px;
        }

        .advanced-panel {
            border-radius: 18px;
            border: 1px solid var(--overlay-3);
            background: var(--overlay-1);
            overflow: hidden;
        }

        .advanced-hint {
            font-size: 0.8rem;
            color: var(--text-soft);
            font-style: italic;
            margin: 0;
        }

        .advanced-panel summary,
        .history-panel summary,
        .collapsible-panel summary {
            list-style: none;
            cursor: pointer;
            user-select: none;
        }

        .advanced-panel summary::-webkit-details-marker,
        .history-panel summary::-webkit-details-marker,
        .collapsible-panel summary::-webkit-details-marker {
            display: none;
        }

        .advanced-panel summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 16px 18px;
            color: var(--text-soft);
            font-weight: 600;
        }

        .advanced-panel summary::after,
        .history-panel summary::after,
        .collapsible-panel summary::after {
            content: "+";
            color: var(--brand-strong);
            font-size: 20px;
            line-height: 1;
            transition: transform 160ms ease;
        }

        .advanced-panel[open] summary::after,
        .history-panel[open] summary::after,
        .collapsible-panel[open] summary::after {
            transform: rotate(45deg);
        }

        .advanced-content {
            padding: 0 18px 18px;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .param-row {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
            gap: 12px;
            align-items: center;
        }

        .tts-row {
            grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 0.8fr) auto;
        }

        .tts-row input {
            min-width: 0;
        }

        .tts-modal {
            position: fixed;
            inset: 0;
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(4px);
        }

        .tts-modal[hidden] { display: none; }

        .tts-modal-card {
            background: var(--panel);
            border: 1px solid var(--border);
            border-radius: 14px;
            width: min(480px, 90vw);
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
        }

        .tts-modal-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            border-bottom: 1px solid var(--border);
        }

        .tts-modal-title {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text);
        }

        .tts-modal-close {
            background: none;
            border: none;
            color: var(--text-muted);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0 4px;
            line-height: 1;
        }

        .tts-modal-close:hover { color: var(--text); }

        .tts-modal-body {
            padding: 16px 20px;
        }

        .tts-voice-list {
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin-bottom: 10px;
        }

        .tts-voice-item {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 10px;
            border-radius: 8px;
            background: var(--surface);
            font-size: 0.85rem;
        }

        .tts-voice-name { flex: 1; font-weight: 500; }
        .tts-voice-type { font-size: 0.75rem; color: var(--text-muted); padding: 2px 6px; border-radius: 4px; background: var(--bg); }
        .tts-voice-ref { font-size: 0.7rem; color: var(--text-muted); }
        .tts-voice-play {
            background: none;
            border: 1px solid var(--border);
            color: var(--text);
            border-radius: 6px;
            padding: 3px 8px;
            font-size: 0.75rem;
            cursor: pointer;
            line-height: 1;
        }
        .tts-voice-play:hover { background: var(--overlay-3); }
        .tts-voice-delete {
            background: none;
            border: 1px solid var(--border);
            color: var(--danger, #ff5252);
            border-radius: 6px;
            padding: 3px 8px;
            font-size: 0.75rem;
            cursor: pointer;
        }

        .tts-divider {
            border: none;
            border-top: 1px solid var(--border);
            margin: 16px 0;
        }

        .tts-upload-section {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .tts-upload-title {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 4px;
        }

        .tts-field-label {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .tts-field-input {
            padding: 6px 10px;
            border-radius: 8px;
            border: 1px solid var(--border);
            background: var(--surface);
            color: var(--text);
            font-size: 0.85rem;
        }

        .tts-consent-row {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 0.8rem;
            color: var(--text-muted);
            cursor: pointer;
        }

        .tts-consent-row input[type="checkbox"] {
            margin-top: 2px;
        }

        .tts-upload-buttons {
            display: flex;
            gap: 8px;
            margin-top: 4px;
        }

        .tts-upload-buttons button {
            flex: 1;
        }

        .tts-upload-buttons button:disabled {
            opacity: 0.35;
            cursor: not-allowed;
        }

        .tts-record-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 0;
            min-height: 1.8em;
        }

        .tts-record-bar[hidden] { display: none; }

        .tts-wave-canvas {
            flex: 1;
            border-radius: 6px;
            background: rgba(0, 0, 0, 0.2);
            height: 50px;
            min-width: 100px;
        }

        .tts-record-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #ff1744;
            flex-shrink: 0;
            animation: tts-pulse 1s ease-in-out infinite;
        }

        .tts-audio-tools {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 6px 0;
        }

        .tts-audio-tools[hidden] { display: none; }

        .tts-audio-tools button {
            flex: 0 0 auto;
            width: auto;
            padding: 5px 12px;
        }

        .tts-transcribe-status {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .tts-transcribe-status[hidden] { display: none; }

        .tts-field-error {
            font-size: 0.8rem;
            color: #ff1744;
            margin-top: 4px;
        }

        .tts-field-error[hidden] { display: none; }

        @keyframes tts-pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(0.7); }
        }

        .tts-record-status {
            font-size: 0.8rem;
            color: #ff1744;
            font-weight: 600;
            white-space: nowrap;
        }

        .translation-box {
            border-radius: 28px;
            padding: 24px;
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        .translation-heading {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            align-items: flex-start;
            flex-wrap: wrap;
        }

        .translation-copy {
            color: var(--text-soft);
            max-width: 72ch;
            font-size: 14px;
            line-height: 1.6;
        }

        .translation-scroll {
            min-height: 340px;
        }

        .stack {
            display: grid;
            gap: 16px;
        }

        .pair {
            padding: 20px;
            border-radius: 22px;
            border: 1px solid var(--border);
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--surface-deep);
        }

        .pair.latest {
            border-color: rgba(0, 199, 129, 0.3);
            background:
                linear-gradient(180deg, rgba(0, 199, 129, 0.1), var(--overlay-1)),
                var(--surface-deep);
            box-shadow: inset 0 0 0 1px rgba(0, 199, 129, 0.08);
        }

        .pair.previous {
            border-color: var(--overlay-3);
        }

        .pair.placeholder {
            display: grid;
            place-items: center;
            min-height: 280px;
            text-align: center;
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--surface-deep);
        }

        .pair-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            align-items: center;
            margin-bottom: 18px;
        }

        .pair-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            align-items: center;
        }

        .pair-label,
        .lang-chip,
        .status-chip,
        .history-count {
            display: inline-flex;
            align-items: center;
            min-height: 28px;
            padding: 0 10px;
            border-radius: 999px;
            border: 1px solid var(--overlay-3);
            background: var(--overlay-2);
            color: var(--text-soft);
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .lang-chip {
            color: var(--text);
            text-transform: none;
            font-weight: 600;
        }

        .status-chip.is-listening {
            border-color: rgba(255, 157, 47, 0.28);
            background: rgba(255, 157, 47, 0.12);
            color: var(--warning-text);
        }

        .status-chip.is-refining {
            border-color: rgba(98, 154, 255, 0.3);
            background: rgba(98, 154, 255, 0.12);
            color: var(--refining-text);
        }

        .status-chip.is-final {
            border-color: rgba(0, 199, 129, 0.3);
            background: rgba(0, 199, 129, 0.12);
            color: var(--brand-text);
        }

        .pair-time {
            color: var(--text-faint);
            font-size: 12px;
        }

        .pair-original-label,
        .pair-translation-label {
            color: var(--text-faint);
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .pair-copy {
            margin: 0;
            word-break: break-word;
            white-space: pre-wrap;
        }

        .pair-copy.original {
            color: var(--text-soft);
            font-size: clamp(15px, 1.3vw, 18px);
            line-height: 1.55;
            margin-bottom: 18px;
        }

        .pair-copy.translation {
            font-size: clamp(24px, 3vw, 40px);
            font-weight: 700;
            line-height: 1.14;
            letter-spacing: -0.02em;
        }

        .pair.previous .pair-copy.translation,
        .history-item .pair-copy.translation {
            font-size: clamp(20px, 2vw, 28px);
        }

        .history-panel {
            border-radius: 24px;
            position: relative;
            z-index: 1;
            overflow: hidden;
        }

        .history-panel summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 14px;
            padding: 18px 22px;
            font-weight: 600;
            color: var(--text-soft);
        }

        .history-summary-main {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .history-body {
            padding: 0 22px 22px;
        }

        .history-list {
            display: grid;
            gap: 12px;
        }

        .history-item {
            padding: 16px 18px;
            border-radius: 18px;
            border: 1px solid var(--overlay-3);
            background: var(--overlay-1);
        }

        .history-item .pair {
            padding: 0;
            border: 0;
            border-radius: 0;
            background: transparent;
            box-shadow: none;
        }

        .history-item .pair-meta,
        .history-item .en {
            margin-bottom: 14px;
        }

        #recordingBanner {
            position: sticky;
            top: 0;
            margin: -32px -20px 20px;
            height: 42px;
            display: none;
            align-items: center;
            justify-content: center;
            background: var(--recording-banner-bg);
            color: #0f1115;
            font-weight: 800;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            z-index: 200;
            animation: recordingPulse 1.4s ease-in-out infinite;
        }

        #recordingBanner.visible {
            display: flex;
        }

        #recordingBanner[data-state="paused"] {
            background: var(--recording-banner-bg-paused);
            animation: none;
        }

        @keyframes recordingPulse {

            0%,
            100% {
                filter: saturate(1);
            }

            50% {
                filter: saturate(1.3);
            }
        }

        #log {
            display: none;
        }

        #exportOverlay,
        #recordConsentModal,
        #newRoomConfirmModal {
            position: fixed;
            inset: 0;
            display: none;
            align-items: center;
            justify-content: center;
            backdrop-filter: blur(6px);
        }

        #exportOverlay {
            background: rgba(2, 6, 10, 0.7);
            z-index: 300;
        }

        #recordConsentModal,
        #newRoomConfirmModal {
            background: rgba(2, 6, 10, 0.78);
            z-index: 350;
        }

        #exportOverlay.visible,
        #recordConsentModal.visible,
        #newRoomConfirmModal.visible {
            display: flex;
        }

        .export-card,
        .record-modal-card {
            width: min(560px, calc(100vw - 32px));
            border-radius: 24px;
            padding: 24px;
            background:
                linear-gradient(180deg, var(--overlay-1), var(--overlay-1)),
                var(--panel-strong);
        }

        .export-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .export-stage {
            font-size: 15px;
            color: var(--text-soft);
            margin-bottom: 8px;
        }

        .export-detail {
            font-size: 13px;
            color: var(--text-faint);
            margin-bottom: 16px;
            min-height: 18px;
        }

        .export-bar-wrap {
            width: 100%;
            height: 14px;
            border-radius: 999px;
            background: var(--overlay-3);
            overflow: hidden;
            border: 1px solid var(--overlay-3);
        }

        .export-bar {
            height: 100%;
            width: 0%;
            border-radius: inherit;
            background: linear-gradient(90deg, var(--brand), var(--brand-strong));
            transition: width 240ms ease;
        }

        .export-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            margin-top: 10px;
            font-size: 13px;
            color: var(--text-faint);
        }

        .record-modal-card h4 {
            margin: 0 0 12px;
            font-size: 24px;
        }

        .record-modal-card p {
            margin: 0 0 20px;
            color: var(--text-soft);
            line-height: 1.6;
            font-size: 15px;
        }

        .record-modal-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: flex-end;
        }

        .record-modal-actions button {
            flex: 1 1 auto;
            min-width: 160px;
        }

        @media (max-width: 1080px) {
            .topbar {
                grid-template-columns: 1fr;
            }

            .param-row {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 720px) {
            body {
                padding: 20px 14px 18px;
            }

            #recordingBanner {
                margin: -20px -14px 16px;
            }

            .hero-card,
            .translation-box,
            .history-panel,
            .collapsible-panel {
                border-radius: 22px;
            }

            .hero-card,
            .translation-box,
            .history-panel {
                padding: 18px;
            }

            .wave-card {
                padding: 16px;
            }

            .collapsible-summary {
                padding: 16px 18px;
                align-items: flex-start;
            }

            .collapsible-title {
                font-size: 18px;
            }

            .collapsible-body {
                padding: 0 18px 18px;
            }

            .panel-heading,
            .translation-heading,
            .wave-card-label,
            .pair-meta,
            .history-panel summary {
                align-items: flex-start;
                flex-direction: column;
            }

            .hero-brand {
                align-items: flex-start;
                flex-direction: column;
                gap: 14px;
            }

            .controls-row,
            .hero-meta,
            .pair-tags,
            .history-summary-main,
            .record-modal-actions,
            .export-meta {
                width: 100%;
            }

            .controls-row>*,
            .field-group,
            .controls-row select,
            .controls-row button,
            .controls-row input,
            .record-modal-actions button {
                width: 100%;
            }

            .language-picker {
                width: 100%;
            }

            .translation-scroll {
                min-height: auto;
            }

            .pair {
                padding: 16px;
            }

            .es {
                font-size: clamp(22px, 7vw, 30px);
            }
        }

        .fs-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 44px;
            min-height: 44px;
            padding: 10px;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: var(--overlay-2);
            color: var(--text-soft);
            cursor: pointer;
            transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
            flex: 0 0 auto;
            white-space: normal;
        }

        .fs-toggle:hover {
            background: var(--overlay-3);
            border-color: rgba(0, 199, 129, 0.35);
            color: var(--brand);
        }

        .fs-toggle:focus-visible {
            outline: 2px solid rgba(0, 199, 129, 0.4);
            outline-offset: 2px;
        }

        .fs-icon-contract {
            display: none;
        }

        body.fs-lock {
            overflow: hidden;
        }

        .translation-box.is-fullscreen {
            position: fixed;
            inset: 0;
            z-index: 9999;
            border-radius: 0;
            max-width: none;
            margin: 0;
            display: flex;
            flex-direction: column;
            padding: clamp(16px, 3vw, 32px);
            gap: clamp(12px, 2vw, 18px);
            background: var(--panel-strong);
        }

        .translation-box.is-fullscreen .fs-icon-expand {
            display: none;
        }

        .translation-box.is-fullscreen .fs-icon-contract {
            display: block;
        }

        .translation-box.is-fullscreen .translation-heading {
            flex: 0 0 auto;
        }

        .translation-box.is-fullscreen .translation-scroll {
            flex: 1 1 auto;
            min-height: 0;
            overflow-y: auto;
            overflow-x: hidden;
            display: flex;
            flex-direction: column;
            justify-content: safe center;
        }

        .translation-box.is-fullscreen .stack {
            max-width: 1400px;
            width: 100%;
            margin-block: auto;
            margin-inline: auto;
        }

        .translation-box.is-fullscreen .pair {
            padding: clamp(24px, 3vw, 36px);
            border-radius: clamp(22px, 2.5vw, 32px);
        }

        .translation-box.is-fullscreen .pair-copy.original {
            font-size: clamp(18px, 1.8vw, 26px);
            line-height: 1.6;
            margin-bottom: clamp(18px, 2vw, 26px);
        }

        .translation-box.is-fullscreen .pair-copy.translation {
            font-size: clamp(32px, 4.5vw, 64px);
            line-height: 1.15;
        }

        .translation-box.is-fullscreen .pair.previous .pair-copy.translation {
            font-size: clamp(26px, 3.5vw, 44px);
        }

        .translation-box.is-fullscreen .pair-original-label,
        .translation-box.is-fullscreen .pair-translation-label {
            font-size: 13px;
            margin-bottom: 10px;
        }

        @media (max-width: 768px) {
            .translation-box.is-fullscreen {
                padding: clamp(14px, 4vw, 20px);
            }

            .translation-box.is-fullscreen .pair-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }

            .translation-box.is-fullscreen .pair-copy.translation {
                font-size: clamp(26px, 8vw, 38px);
            }
        }

        @media (max-width: 480px) {
            .translation-box.is-fullscreen {
                padding: 14px;
            }

            .translation-box.is-fullscreen .pair {
                padding: 14px;
            }

            .translation-box.is-fullscreen .pair-copy.translation {
                font-size: clamp(22px, 7vw, 30px);
            }

            .fs-toggle {
                min-width: 48px;
                min-height: 48px;
            }
        }

        @media (orientation: landscape) and (max-height: 500px) {
            .translation-box.is-fullscreen .translation-heading {
                margin-bottom: 4px;
            }

            .translation-box.is-fullscreen .translation-label {
                font-size: 10px;
            }
        }

        .theme-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 44px;
            min-height: 44px;
            padding: 10px;
            border-radius: 999px;
            border: 1px solid var(--border);
            background: var(--panel-soft);
            color: var(--text-soft);
            cursor: pointer;
            transition: background 160ms ease, border-color 160ms ease, color 160ms ease;
            flex: 0 0 auto;
            margin-left: auto;
            white-space: normal;
        }

        .theme-toggle:hover {
            background: var(--overlay-3);
            border-color: rgba(0, 199, 129, 0.35);
            color: var(--brand);
        }

        .theme-toggle:focus-visible {
            outline: 2px solid rgba(0, 199, 129, 0.4);
            outline-offset: 2px;
        }

        .hero-brand .theme-toggle {
            margin-left: auto;
        }

        /* Icon swap: show sun icon when current theme is dark (action: switch to light),
           show moon icon when current theme is light (action: switch to dark).
           Convention: icon indicates the theme you'll switch TO. */
        .theme-icon-moon {
            display: none;
        }

        [data-theme="light"] .theme-icon-moon {
            display: block;
        }

        [data-theme="light"] .theme-icon-sun {
            display: none;
        }