/**
 * Tool Layout - Unified layout for all audio tool pages
 *
 * Structure:
 * .tool-page
 *   .site-header
 *   .tool-layout
 *     .tool-sidebar
 *     .tool-main
 *       .tool-header
 *       .privacy-notice
 *       .tool-content
 *   .site-footer
 */

/* ==================== CSS VARIABLES ==================== */
:root {
    /* Layout */
    --sidebar-width: 240px;
    --header-height: 60px;
    --content-max-width: 900px;

    /* Colors - Dark Theme (No Gradients) */
    --color-bg-primary: #0d0d0f;
    --color-bg-secondary: #141416;
    --color-bg-tertiary: #1a1a1d;
    --color-bg-elevated: #222225;
    --color-bg-hover: #2a2a2e;

    --color-border: #2d2d32;
    --color-border-light: #3d3d42;

    --color-text-primary: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-text-muted: #6e6e73;

    --color-accent: #d4a849;
    --color-accent-hover: #e6bc5c;
    --color-accent-muted: rgba(212, 168, 73, 0.15);

    --color-success: #34c759;
    --color-error: #ff453a;
    --color-warning: #ff9f0a;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ==================== RESET & BASE ==================== */
.tool-page {
    min-height: 100vh;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-family: var(--font-family);
    display: flex;
    flex-direction: column;
}

/* ==================== SITE HEADER ==================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
}

.site-header__container {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: var(--font-semibold);
    font-size: var(--text-lg);
}

.site-header__logo-icon {
    color: var(--color-accent);
}

.site-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.site-header__link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    transition: color var(--transition-fast);
}

.site-header__link:hover {
    color: var(--color-text-primary);
}

.site-header__menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    padding: var(--space-2);
    cursor: pointer;
}

/* ==================== LANGUAGE PICKER ==================== */
.lang-picker {
    position: relative;
}

.lang-picker__toggle {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-picker__toggle:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-light);
}

.lang-picker__dropdown {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    min-width: 140px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    max-height: 300px;
    overflow-y: auto;
}

.lang-picker__option {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-4);
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-picker__option:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* ==================== TOOL LAYOUT ==================== */
.tool-layout {
    flex: 1;
    display: flex;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* ==================== TOOL SIDEBAR ==================== */
.tool-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: var(--header-height);
    height: calc(100vh - var(--header-height));
    overflow-y: auto;
}

.tool-sidebar__header {
    padding: var(--space-5) var(--space-5) var(--space-3);
}

.tool-sidebar__title {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tool-sidebar__nav {
    flex: 1;
    padding: 0 var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.tool-sidebar__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-3);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-fast);
}

.tool-sidebar__item:hover:not(.tool-sidebar__item--disabled) {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.tool-sidebar__item--active {
    background: var(--color-accent-muted);
    color: var(--color-accent);
}

.tool-sidebar__item--active .tool-sidebar__icon {
    color: var(--color-accent);
}

.tool-sidebar__item--disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tool-sidebar__icon {
    flex-shrink: 0;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.tool-sidebar__badge {
    margin-left: auto;
    font-size: var(--text-xs);
    padding: 2px var(--space-2);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
}

/* Sidebar Ad */
.tool-sidebar__ad {
    padding: var(--space-4) var(--space-3);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.tool-sidebar__ad-label {
    display: block;
    font-size: 10px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-2);
    text-align: center;
}

.ad-slot--sidebar {
    min-height: 200px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
}

.tool-sidebar__footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
}

.tool-sidebar__privacy {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Sidebar Overlay (Mobile) */
.tool-sidebar__overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 90;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.tool-sidebar__overlay--visible {
    opacity: 1;
}

/* ==================== TOOL MAIN ==================== */
.tool-main {
    flex: 1;
    padding: var(--space-6);
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

/* ==================== TOOL HEADER ==================== */
.tool-header {
    margin-bottom: var(--space-6);
    text-align: center;
}

.tool-header__title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2);
}

.tool-header__desc {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ==================== PRIVACY NOTICE ==================== */
.privacy-notice {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
}

.privacy-notice__icon {
    flex-shrink: 0;
    color: var(--color-accent);
    margin-top: 2px;
}

.privacy-notice__text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0;
}

.privacy-notice__text strong {
    color: var(--color-text-primary);
}

/* ==================== BROWSER WARNING ==================== */
.browser-warning {
    display: none;
    align-items: flex-start;
    gap: var(--space-3);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
}

.browser-warning.visible {
    display: flex;
}

.browser-warning__icon {
    flex-shrink: 0;
    color: #f59e0b;
    margin-top: 1px;
}

.browser-warning__text {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* ==================== TOOL CONTENT ==================== */
.tool-content {
    width: 100%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}

/* ==================== UPLOAD ZONE ==================== */
.upload-zone {
    position: relative;
    width: 100%;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-12) var(--space-6);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-accent);
    background: var(--color-accent-muted);
}

.upload-zone__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-zone__icon {
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

.upload-zone__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2);
}

.upload-zone__subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin: 0 0 var(--space-3);
}

.upload-zone__formats {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin: 0;
}

/* Upload Loading */
.upload-zone__loading {
    padding: var(--space-8);
}

.upload-zone__spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    margin: 0 auto var(--space-4);
    animation: spin 1s linear infinite;
}

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

.upload-zone__progress {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ==================== CONTROLS AREA ==================== */
.controls-area {
    margin-top: var(--space-6);
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== PROGRESS SECTION ==================== */
.progress-section {
    margin-top: var(--space-6);
    padding: var(--space-4);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
}

.progress-section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.progress-section__label {
    font-size: var(--text-sm);
    color: var(--color-text-primary);
}

.progress-section__percent {
    font-size: var(--text-sm);
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
}

.progress-section__bar {
    height: 6px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-section__fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    width: 0%;
}

.progress-section__detail {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin: var(--space-2) 0 0;
    text-align: center;
}

/* ==================== AD SLOTS ==================== */
.ad-slot {
    margin-bottom: var(--space-4);
}

.ad-slot--banner {
    min-height: 90px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.ad-slot--inline {
    min-height: 100px;
    margin-top: var(--space-6);
}

/* ==================== SITE FOOTER ==================== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-6) 0;
    margin-top: auto;
}

.site-footer__container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-footer__copyright {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.site-footer__nav {
    display: flex;
    gap: var(--space-6);
}

.site-footer__link {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.site-footer__link:hover {
    color: var(--color-text-primary);
}

.site-footer__brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-muted);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.site-footer__brand a {
    color: var(--color-accent);
    font-weight: 500;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.site-footer__brand a:hover {
    opacity: 0.8;
}

/* ==================== TOAST CONTAINER ==================== */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* ==================== FEEDBACK BUTTON ==================== */
.feedback-btn {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    height: 48px;
    padding: 0 var(--space-4);
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-full);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-fast);
    z-index: 50;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.feedback-btn__text {
    white-space: nowrap;
}

.feedback-btn:hover {
    background: var(--color-accent-hover);
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

/* ==================== UTILITY CLASSES ==================== */
.hidden {
    display: none !important;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .tool-layout {
        padding: 0;
    }

    .tool-main {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    /* Header */
    .site-header__nav {
        display: none;
    }

    .site-header__menu-toggle {
        display: flex;
    }

    /* Hide sidebar ad on mobile (too cramped) */
    .tool-sidebar__ad {
        display: none;
    }

    /* Sidebar - Mobile */
    .tool-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

    .tool-sidebar--open {
        transform: translateX(0);
    }

    .tool-sidebar__overlay {
        display: block;
    }

    /* Main Content */
    .tool-main {
        padding: var(--space-4);
    }

    .tool-content {
        padding: var(--space-4);
    }

    .upload-zone {
        padding: var(--space-8) var(--space-4);
    }

    /* Footer */
    .site-footer__container {
        flex-direction: column;
        gap: var(--space-3);
        text-align: center;
    }

    /* Feedback Button */
    .feedback-btn {
        bottom: var(--space-4);
        right: var(--space-4);
        height: 44px;
        padding: 0 var(--space-3);
        font-size: var(--text-xs);
    }

    .feedback-btn__text {
        display: none;
    }

    .feedback-btn {
        width: 44px;
        padding: 0;
    }
}

@media (max-width: 480px) {
    .tool-header__title {
        font-size: var(--text-xl);
    }

    .privacy-notice {
        flex-direction: column;
        text-align: center;
    }

    .upload-zone__icon {
        width: 40px;
        height: 40px;
    }
}

/* ==================== COMMON FORM ELEMENTS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn--primary {
    background: var(--color-accent);
    color: #000;
}

.btn--primary:hover {
    background: var(--color-accent-hover);
}

.btn--primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn--secondary:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-light);
}

.btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn--ghost:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

/* Input */
.input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.input:focus {
    outline: none;
    border-color: var(--color-accent);
}

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

/* Choice Group (Toggle Buttons) */
.choice-group {
    display: flex;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-1);
}

.choice-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.choice-btn:hover:not(.active) {
    color: var(--color-text-primary);
}

.choice-btn.active {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
}

/* Card */
.card {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

/* Divider */
.divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-4) 0;
}