:root {
    --bg-color: #0F0F12;
    --surface-color: #1C1C1E;
    --primary-color: #0A84FF;
    --primary-hover: #0077ED;
    --danger-color: #FF453A;
    --text-primary: #FFFFFF;
    --text-secondary: #8E8E93;
    --border-radius: 16px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --white-06: rgba(255, 255, 255, 0.06);
    --white-10: rgba(255, 255, 255, 0.1);
    --white-12: rgba(255, 255, 255, 0.12);
    --white-20: rgba(255, 255, 255, 0.2);
    --white-25: rgba(255, 255, 255, 0.25);
    --white-32: rgba(255, 255, 255, 0.32);
    --white-55: rgba(255, 255, 255, 0.55);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* Prevent body scroll, handle in main */
}

.container {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

header {
    padding-bottom: 20px;
    text-align: left;
}

header .header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

header h1 {
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.025em;
    color: var(--text-secondary);
    margin: 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    justify-content: flex-start;
}

.app-logo {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    display: block;
}

.github-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background: none;
    border: none;
    padding: 0;
    text-decoration: none;
    transition: color 0.2s ease;
}

.github-link:hover {
    color: var(--text-primary);
}

.github-link:focus-visible {
    color: var(--text-primary);
    outline: none;
}

.github-icon {
    width: 18px;
    height: 18px;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
    /* Important for flex child scrolling */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: env(safe-area-inset-bottom);
}

.input-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    gap: 8px;
}

.input-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.slot-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.slot-button {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    border: 1px solid var(--white-12);
    background: var(--white-06);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.slot-button:hover {
    background: var(--white-12);
    border-color: var(--white-20);
    color: var(--text-primary);
}

.slot-button:focus-visible {
    background: var(--white-20);
    border-color: #ffffff;
    color: var(--text-primary);
    outline: none;
}

.slot-button.is-active {
    background: var(--primary-color);
    border-color: transparent;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(10, 132, 255, 0.3);
}

.input-action {
    border: 1px solid var(--white-12);
    background: var(--white-06);
    color: var(--text-primary);
    font-size: 0.8rem;
    padding: 6px 12px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.input-action:hover,
.input-action:focus-visible {
    background: var(--white-12);
    border-color: var(--white-20);
    outline: none;
}

.input-action.is-confirm {
    background: rgba(255, 69, 58, 0.18);
    border-color: rgba(255, 69, 58, 0.7);
    color: var(--danger-color);
}

.input-action.is-confirm:hover,
.input-action.is-confirm:focus-visible {
    background: rgba(255, 69, 58, 0.28);
    border-color: rgba(255, 69, 58, 0.9);
}

.input-toolbar .input-action {
    margin-left: auto;
}

textarea {
    flex: 1;
    width: 100%;
    background-color: var(--surface-color);
    border: 1px solid var(--white-10);
    border-radius: var(--border-radius);
    padding: 16px;
    color: var(--white-55);
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
    overflow-wrap: anywhere;
    word-break: break-word;
    scrollbar-width: thin;
    scrollbar-color: var(--white-25) transparent;
}

textarea.is-drop-target {
    border-color: var(--primary-color);
    background-color: rgba(10, 132, 255, 0.08);
    box-shadow: 0 0 0 2px rgba(10, 132, 255, 0.2);
}

textarea.is-drop-blocked {
    border-color: rgba(255, 69, 58, 0.55);
    background-color: rgba(255, 69, 58, 0.08);
    cursor: not-allowed;
}

textarea::-webkit-scrollbar {
    width: 10px;
}

textarea::-webkit-scrollbar-track {
    background: transparent;
}

textarea::-webkit-scrollbar-thumb {
    background-color: var(--white-20);
    border-radius: 999px;
    border: 3px solid transparent;
    background-clip: padding-box;
}

textarea::-webkit-scrollbar-thumb:hover {
    background-color: var(--white-32);
}

.helper-text {
    margin: 0;
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

#chrome-tip {
    text-align: center;
}

textarea:focus {
    border-color: var(--primary-color);
}

.chunk-display {
    padding: 24px;
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1.5rem;
    line-height: 1.4;
    font-weight: 500;
    text-align: center;
    border: 1px solid var(--primary-color);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.hidden {
    display: none !important;
}

.voice-select-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.voice-select-wrapper label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

select {
    appearance: none;
    background-color: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--white-10);
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
    width: 100%;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238E8E93' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 16px;
}

.auto-detect {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.auto-detect label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.auto-detect input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

.playback-controls {
    display: flex;
    justify-content: center;
    gap: 24px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 6px;
}

.btn {
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        background-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    flex-shrink: 0;
}

.btn:focus {
    outline: none;
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 12px rgba(10, 132, 255, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.95);
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--white-10);
    color: var(--text-primary);
}

.btn-secondary:active:not(:disabled) {
    background-color: var(--white-20);
    transform: scale(0.95);
}

.icon {
    width: 28px;
    height: 28px;
}

.icon.hidden {
    display: none;
}

.status-text {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-height: 1.2em;
    /* Prevent layout jump */
}

@media (max-width: 520px) {
    .container {
        padding: 16px;
    }

    main {
        gap: 12px;
    }

    textarea {
        padding: 14px;
        font-size: 1rem;
    }

    .chunk-display {
        padding: 18px;
        font-size: 1.25rem;
    }

    .hide-on-mobile {
        display: none;
    }
    .voice-select-wrapper {
        gap: 6px;
    }

    .slot-button {
        width: 28px;
        height: 28px;
        font-size: 0.78rem;
    }

    .auto-detect {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .playback-controls {
        gap: 16px;
    }

    .btn {
        width: 52px;
        height: 52px;
    }

    .icon {
        width: 24px;
        height: 24px;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 14px;
    }

    .playback-controls {
        gap: 12px;
    }

    .btn {
        width: 48px;
        height: 48px;
    }
}

/* Active Highlight Style (to be used later) */
.highlight {
    background-color: rgba(10, 132, 255, 0.2);
    border-radius: 4px;
}