/* ============================================
   SRT to VTT Converter - Styling with Dark Mode
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;

    /* Primary Colors */
    --primary: #3399cc;
    --primary-light: #E0F2FE;
    --primary-dark: #2980b9;
    --accent: #60a5fa;

    /* Status Colors */
    --success: #339966;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --danger: #e64e4e;
    --danger-light: #FEE2E2;
    --info: #3399cc;
    --info-light: #DBEAFE;

    /* Background Colors */
    --bg: #F8FAFC;
    --bg-elevated: #FFFFFF;
    --bg-secondary: #F1F5F9;
    --bg-tertiary: #E2E8F0;

    /* Text Colors */
    --text: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;

    /* Border Colors */
    --border: #E2E8F0;
    --border-light: #F1F5F9;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --shadow-primary: 0 4px 14px rgba(51, 153, 204, 0.25);
    --shadow-primary-hover: 0 6px 20px rgba(51, 153, 204, 0.35);

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Input */
    --input-bg: #FFFFFF;
    --input-border: #E2E8F0;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-light: rgba(96, 165, 250, 0.15);
    --primary-dark: #3b82f6;
    --accent: #93c5fd;

    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    --warning: #FBBF24;
    --warning-light: rgba(251, 191, 36, 0.15);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    --info: #60a5fa;
    --info-light: rgba(96, 165, 250, 0.15);

    --bg: #0F172A;
    --bg-elevated: #1E293B;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;

    --text: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;

    --border: rgba(255,255,255,0.1);
    --border-light: rgba(255,255,255,0.05);

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    --shadow-primary: 0 4px 14px rgba(96, 165, 250, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(96, 165, 250, 0.3);

    --input-bg: #334155;
    --input-border: #475569;
}

/* ============================================
   LAYOUT
   ============================================ */
.tool-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 30px 20px 60px;
}

/* ============================================
   TOOL HEADER
   ============================================ */
.tool-header {
    text-align: center;
    margin-bottom: 32px;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 12px;
}

.tool-icon-wrapper {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    color: var(--primary);
}

.tool-icon-wrapper i,
.tool-icon-wrapper svg {
    width: 26px;
    height: 26px;
}

.tool-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    margin: 0;
    line-height: 1.2;
}

.tool-description {
    max-width: 800px;
    margin: 0 auto;
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   UPLOAD SECTION
   ============================================ */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    background: var(--bg-elevated);
    transition: all var(--transition-speed);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
}

.upload-icon {
    color: var(--text-muted);
    margin-bottom: 16px;
    transition: color var(--transition-speed);
}

.upload-area:hover .upload-icon,
.upload-area.drag-over .upload-icon {
    color: var(--primary);
}

.upload-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    margin: 0 0 6px;
}

.upload-subtitle {
    color: var(--text-muted);
    margin: 0 0 16px;
    font-size: 14px;
}

.file-types {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 14px;
}

.file-type-badge {
    display: inline-block;
    padding: 4px 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ============================================
   ERROR SECTION
   ============================================ */
.error-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    text-align: center;
    border: 1px solid var(--danger);
}

.error-icon {
    color: var(--danger);
    margin-bottom: 16px;
}

.error-message {
    font-size: 15px;
    color: var(--text);
    margin: 0 0 12px;
    line-height: 1.6;
}

.error-message a {
    color: var(--primary);
    text-decoration: underline;
}

.error-message code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.error-contact {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0 0 20px;
}

.error-contact a {
    color: var(--primary);
    text-decoration: underline;
}

/* ============================================
   STATS BAR
   ============================================ */
.stats-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.stat-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}

.stat-item i,
.stat-item svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

.stat-conversion {
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-light);
}

.stat-conversion i,
.stat-conversion svg {
    color: var(--primary);
}

/* ============================================
   PREVIEW TABS
   ============================================ */
.preview-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 0;
    background: var(--bg-secondary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    padding: 6px 6px 0;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.tab-btn:hover {
    color: var(--text);
    background: var(--bg-elevated);
}

.tab-btn.active {
    color: var(--primary);
    background: var(--bg-elevated);
    font-weight: 600;
}

/* ============================================
   PREVIEW PANEL
   ============================================ */
.preview-panel,
.source-panel {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.preview-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.edit-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    user-select: none;
}

.edit-toggle input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.preview-textarea {
    width: 100%;
    min-height: 320px;
    max-height: 500px;
    padding: 16px;
    border: none;
    background: var(--bg-elevated);
    color: var(--text);
    font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    transition: background var(--transition-speed);
}

.preview-textarea:read-only {
    cursor: default;
}

.preview-textarea.editable {
    background: var(--primary-light);
}

/* ============================================
   ACTION BUTTONS
   ============================================ */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-primary-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

.btn-secondary.copied {
    background: var(--success-light);
    color: var(--success);
    border-color: var(--success);
}

/* ============================================
   RELATED TOOLS BAR
   ============================================ */
.related-tools-bar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
    padding: 14px 18px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.related-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-speed);
}

.related-link:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

/* ============================================
   INFO SECTIONS
   ============================================ */
.info-sections {
    margin-top: 48px;
}

.info-card {
    margin-bottom: 24px;
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 16px;
}

.info-card h2 i,
.info-card h2 svg {
    color: var(--primary);
    flex-shrink: 0;
}

.info-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 12px;
}

.info-card p:last-child {
    margin-bottom: 0;
}

.info-card a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.info-card a:hover {
    color: var(--primary-dark);
}

.info-card code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--danger);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Steps List */
.steps-list {
    padding-left: 24px;
    margin: 0;
}

.steps-list li {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 10px;
    padding-left: 6px;
}

.steps-list li:last-child {
    margin-bottom: 0;
}

.steps-list li a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Change List */
.change-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 12px;
}

.change-item {
    padding: 14px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.change-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.change-item p {
    margin: 0;
    font-size: 14px;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: all var(--transition-speed);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-elevated);
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    transition: all var(--transition-speed);
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question i,
.faq-question svg {
    color: var(--text-muted);
    transition: transform var(--transition-speed);
    flex-shrink: 0;
}

.faq-item.open .faq-question i,
.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    display: none;
    padding: 0 18px 16px;
    background: var(--bg-elevated);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.faq-answer a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.faq-answer code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--danger);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .tool-container {
        padding: 20px 14px 40px;
    }

    .tool-title {
        font-size: 22px;
    }

    .tool-description {
        font-size: 14px;
    }

    .upload-area {
        padding: 40px 20px;
    }

    .stats-bar {
        gap: 6px;
        padding: 10px 12px;
    }

    .stat-item {
        font-size: 12px;
        padding: 3px 8px;
    }

    .preview-textarea {
        min-height: 220px;
        font-size: 12px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .related-tools-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .btn-primary:hover {
        transform: none;
    }

    .info-card h2 {
        font-size: 18px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion) {
    * {
        transition-duration: 0.01ms !important;
    }
}