/* ==========================================================================
   Subtitle Convert — Hand-written CSS
   All selectors use .sc- prefix to avoid conflicts with Google AdSense auto-ads.
   No universal * {} resets. No overflow:hidden on html/body.
   Mobile-first responsive design.
   ========================================================================== */

/* ---------- CSS Custom Properties (Light Theme) ---------- */
:root {
    --sc-primary: #4f46e5;
    --sc-primary-hover: #4338ca;
    --sc-primary-light: #e0e7ff;
    --sc-accent: #06b6d4;
    --sc-success: #16a34a;
    --sc-success-bg: #f0fdf4;
    --sc-success-border: #bbf7d0;
    --sc-error: #dc2626;
    --sc-error-bg: #fef2f2;
    --sc-error-border: #fecaca;
    --sc-bg: #ffffff;
    --sc-bg-alt: #f8fafc;
    --sc-bg-card: #ffffff;
    --sc-text: #1e293b;
    --sc-text-muted: #64748b;
    --sc-border: #e2e8f0;
    --sc-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --sc-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --sc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --sc-radius: 8px;
    --sc-radius-lg: 12px;
    --sc-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --sc-font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
    --sc-max-width: 1100px;
    --sc-transition: 0.2s ease;
}

/* ---------- Dark Mode ---------- */
@media (prefers-color-scheme: dark) {
    :root {
        --sc-primary: #818cf8;
        --sc-primary-hover: #a5b4fc;
        --sc-primary-light: #1e1b4b;
        --sc-accent: #22d3ee;
        --sc-success: #4ade80;
        --sc-success-bg: #052e16;
        --sc-success-border: #166534;
        --sc-error: #f87171;
        --sc-error-bg: #450a0a;
        --sc-error-border: #991b1b;
        --sc-bg: #0f172a;
        --sc-bg-alt: #1e293b;
        --sc-bg-card: #1e293b;
        --sc-text: #f1f5f9;
        --sc-text-muted: #94a3b8;
        --sc-border: #334155;
        --sc-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
        --sc-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --sc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    }
}

/* ---------- Base (scoped, no universal reset) ---------- */
.sc-header,
.sc-main,
.sc-footer,
.sc-hero,
.sc-section,
.sc-container,
.sc-form,
.sc-nav,
.sc-alert,
.sc-feature-card,
.sc-step,
.sc-faq-item,
.sc-upload-zone,
.sc-style-panel,
.sc-preview-wrapper,
.sc-format-table,
.sc-content-page {
    box-sizing: border-box;
    font-family: var(--sc-font);
    color: var(--sc-text);
    line-height: 1.6;
}

.sc-header *,
.sc-main *,
.sc-footer * {
    box-sizing: border-box;
}

/* ---------- Layout ---------- */
.sc-container {
    max-width: var(--sc-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 20px;
    padding-right: 20px;
}

/* ---------- Header & Nav ---------- */
.sc-header {
    background: var(--sc-bg);
    border-bottom: 1px solid var(--sc-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.sc-nav .sc-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    padding-bottom: 12px;
}

.sc-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--sc-primary);
    text-decoration: none;
}

.sc-logo:hover {
    color: var(--sc-primary-hover);
}

.sc-logo-icon {
    font-size: 1.5rem;
}

.sc-nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 24px;
}

.sc-nav-links a {
    color: var(--sc-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--sc-transition);
}

.sc-nav-links a:hover {
    color: var(--sc-primary);
}

/* ---------- Main ---------- */
.sc-main {
    background: var(--sc-bg);
    min-height: calc(100vh - 160px);
}

/* ---------- Hero ---------- */
.sc-hero {
    background: linear-gradient(135deg, var(--sc-primary) 0%, #7c3aed 100%);
    color: #ffffff;
    text-align: center;
    padding: 60px 20px;
}

.sc-hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0 0 8px 0;
    letter-spacing: -0.02em;
}

.sc-hero-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    margin: 0 0 16px 0;
    opacity: 0.9;
}

.sc-hero-desc {
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.85;
    line-height: 1.7;
}

/* ---------- Sections ---------- */
.sc-section {
    padding: 60px 0;
}

.sc-section-alt {
    background: var(--sc-bg-alt);
}

.sc-section-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 0 12px 0;
    color: var(--sc-text);
}

.sc-section-desc {
    text-align: center;
    color: var(--sc-text-muted);
    max-width: 600px;
    margin: 0 auto 32px auto;
    font-size: 1rem;
}

/* ---------- Alerts ---------- */
.sc-alert {
    padding: 16px 20px;
    border-radius: var(--sc-radius);
    margin-bottom: 24px;
    font-size: 0.95rem;
    border: 1px solid;
}

.sc-alert-success {
    background: var(--sc-success-bg);
    border-color: var(--sc-success-border);
    color: var(--sc-success);
}

.sc-alert-error {
    background: var(--sc-error-bg);
    border-color: var(--sc-error-border);
    color: var(--sc-error);
}

/* ---------- Buttons ---------- */
.sc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border: none;
    border-radius: var(--sc-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--sc-transition);
    font-family: var(--sc-font);
    line-height: 1.5;
}

.sc-btn-primary {
    background: var(--sc-primary);
    color: #ffffff;
}

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

.sc-btn-convert {
    background: linear-gradient(135deg, var(--sc-primary) 0%, #7c3aed 100%);
    color: #ffffff;
    padding: 14px 40px;
    font-size: 1.1rem;
    border-radius: var(--sc-radius-lg);
    box-shadow: var(--sc-shadow-md);
}

.sc-btn-convert:hover {
    transform: translateY(-1px);
    box-shadow: var(--sc-shadow-lg);
}

.sc-btn-download {
    background: var(--sc-success);
    color: #ffffff;
    margin-left: 12px;
    padding: 8px 20px;
    font-size: 0.9rem;
}

.sc-btn-download:hover {
    opacity: 0.9;
}

/* ---------- Form ---------- */
.sc-form {
    max-width: 800px;
    margin: 0 auto;
}

.sc-form-group {
    margin-bottom: 16px;
}

.sc-label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--sc-text);
}

.sc-input,
.sc-select {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.95rem;
    font-family: var(--sc-font);
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius);
    background: var(--sc-bg);
    color: var(--sc-text);
    transition: border-color var(--sc-transition), box-shadow var(--sc-transition);
    appearance: none;
    -webkit-appearance: none;
}

.sc-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%2364748b'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.sc-input:focus,
.sc-select:focus {
    outline: none;
    border-color: var(--sc-primary);
    box-shadow: 0 0 0 3px var(--sc-primary-light);
}

.sc-color-input {
    width: 100%;
    height: 42px;
    padding: 4px;
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius);
    background: var(--sc-bg);
    cursor: pointer;
}

.sc-range {
    width: 100%;
    accent-color: var(--sc-primary);
}

.sc-range-val {
    display: inline-block;
    min-width: 24px;
    text-align: center;
    font-weight: 700;
    color: var(--sc-primary);
    font-size: 0.85rem;
}

.sc-options-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.sc-form-actions {
    text-align: center;
    margin-top: 28px;
}

/* ---------- Upload Zone ---------- */
.sc-upload-zone {
    border: 2px dashed var(--sc-border);
    border-radius: var(--sc-radius-lg);
    padding: 40px 20px;
    text-align: center;
    transition: all var(--sc-transition);
    background: var(--sc-bg);
    margin-bottom: 24px;
    cursor: pointer;
}

.sc-upload-zone:hover,
.sc-upload-zone.sc-dragover {
    border-color: var(--sc-primary);
    background: var(--sc-primary-light);
}

.sc-upload-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 12px;
}

.sc-upload-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 8px 0;
    color: var(--sc-text);
}

.sc-upload-or {
    color: var(--sc-text-muted);
    margin: 0 0 12px 0;
    font-size: 0.9rem;
}

.sc-upload-btn {
    cursor: pointer;
}

.sc-upload-hint {
    font-size: 0.8rem;
    color: var(--sc-text-muted);
    margin: 12px 0 0 0;
}

.sc-upload-selected {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--sc-primary-light);
    border-radius: var(--sc-radius);
}

.sc-file-icon {
    font-size: 1.5rem;
}

.sc-file-name {
    font-weight: 600;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sc-file-format {
    font-size: 0.8rem;
    color: var(--sc-text-muted);
    background: var(--sc-bg);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.sc-btn-remove {
    background: none;
    border: none;
    font-size: 1.4rem;
    color: var(--sc-text-muted);
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    font-family: var(--sc-font);
}

.sc-btn-remove:hover {
    color: var(--sc-error);
}

/* ---------- ASS Style Panel ---------- */
.sc-style-panel {
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius-lg);
    margin-bottom: 20px;
    overflow: hidden;
    background: var(--sc-bg-card);
}

.sc-style-title {
    margin: 0;
    font-size: 1rem;
}

.sc-style-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px 20px;
    background: var(--sc-bg-alt);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--sc-text);
    cursor: pointer;
    text-align: left;
    font-family: var(--sc-font);
}

.sc-style-toggle:hover {
    background: var(--sc-primary-light);
}

.sc-toggle-arrow {
    font-size: 0.7rem;
    transition: transform var(--sc-transition);
}

.sc-style-toggle[aria-expanded="true"] .sc-toggle-arrow {
    transform: rotate(180deg);
}

.sc-style-body {
    padding: 20px;
}

.sc-style-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.sc-checkbox-group {
    display: flex;
    gap: 20px;
    align-items: center;
    grid-column: 1 / -1;
}

.sc-checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
}

.sc-checkbox-label input[type="checkbox"] {
    accent-color: var(--sc-primary);
    width: 18px;
    height: 18px;
}

/* ---------- Alignment Grid ---------- */
.sc-alignment-group {
    grid-column: 1 / -1;
}

.sc-alignment-grid {
    display: grid;
    grid-template-columns: repeat(3, 40px);
    gap: 4px;
}

.sc-align-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--sc-border);
    border-radius: 6px;
    background: var(--sc-bg);
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--sc-transition);
    color: var(--sc-text-muted);
    font-family: var(--sc-font);
}

.sc-align-btn:hover {
    border-color: var(--sc-primary);
    color: var(--sc-primary);
}

.sc-align-btn.sc-align-active {
    background: var(--sc-primary);
    color: #ffffff;
    border-color: var(--sc-primary);
}

/* ---------- Live Preview ---------- */
.sc-preview-wrapper {
    margin-top: 20px;
}

.sc-preview-box {
    background: #000000;
    border-radius: var(--sc-radius);
    min-height: 120px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.sc-preview-text {
    color: #ffffff;
    font-family: Arial, sans-serif;
    font-size: 20px;
    text-align: center;
    transition: all 0.3s ease;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
}

/* ---------- Format Table ---------- */
.sc-table-wrapper {
    overflow-x: auto;
    margin-bottom: 20px;
    -webkit-overflow-scrolling: touch;
}

.sc-format-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--sc-bg-card);
    border-radius: var(--sc-radius);
    overflow: hidden;
    box-shadow: var(--sc-shadow);
}

.sc-format-table th,
.sc-format-table td {
    padding: 10px 14px;
    text-align: center;
    border-bottom: 1px solid var(--sc-border);
}

.sc-format-table th {
    background: var(--sc-primary);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.sc-format-table td:first-child {
    text-align: left;
    font-weight: 600;
}

.sc-format-table td:nth-child(2) {
    font-family: var(--sc-font-mono);
    font-size: 0.85rem;
    color: var(--sc-text-muted);
}

.sc-format-table tbody tr:hover {
    background: var(--sc-bg-alt);
}

.sc-yes {
    color: var(--sc-success);
    font-weight: 700;
    font-size: 1.1rem;
}

.sc-note {
    font-size: 0.9rem;
    color: var(--sc-text-muted);
    background: var(--sc-bg-card);
    padding: 14px 18px;
    border-radius: var(--sc-radius);
    border-left: 4px solid var(--sc-accent);
}

/* ---------- Steps ---------- */
.sc-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.sc-step {
    text-align: center;
    padding: 24px 16px;
    background: var(--sc-bg-card);
    border-radius: var(--sc-radius-lg);
    box-shadow: var(--sc-shadow);
    transition: transform var(--sc-transition), box-shadow var(--sc-transition);
}

.sc-step:hover {
    transform: translateY(-2px);
    box-shadow: var(--sc-shadow-md);
}

.sc-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--sc-primary);
    color: #ffffff;
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 12px;
}

.sc-step-title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.sc-step-desc {
    font-size: 0.88rem;
    color: var(--sc-text-muted);
    margin: 0;
    line-height: 1.5;
}

/* ---------- Features Grid ---------- */
.sc-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.sc-feature-card {
    background: var(--sc-bg-card);
    border-radius: var(--sc-radius-lg);
    padding: 28px 24px;
    box-shadow: var(--sc-shadow);
    transition: transform var(--sc-transition), box-shadow var(--sc-transition);
    border: 1px solid var(--sc-border);
}

.sc-feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--sc-shadow-lg);
}

.sc-feature-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.sc-feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.sc-feature-desc {
    font-size: 0.9rem;
    color: var(--sc-text-muted);
    margin: 0;
    line-height: 1.6;
}

/* ---------- FAQ ---------- */
.sc-faq-list {
    max-width: 700px;
    margin: 32px auto 0 auto;
}

.sc-faq-item {
    border: 1px solid var(--sc-border);
    border-radius: var(--sc-radius);
    margin-bottom: 10px;
    overflow: hidden;
    background: var(--sc-bg-card);
}

.sc-faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 16px 20px;
    border: none;
    background: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--sc-text);
    cursor: pointer;
    text-align: left;
    gap: 12px;
    font-family: var(--sc-font);
    line-height: 1.5;
}

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

.sc-faq-arrow {
    font-size: 0.65rem;
    transition: transform var(--sc-transition);
    flex-shrink: 0;
    color: var(--sc-text-muted);
}

.sc-faq-question[aria-expanded="true"] .sc-faq-arrow {
    transform: rotate(180deg);
}

.sc-faq-answer {
    padding: 0 20px 16px 20px;
    font-size: 0.95rem;
    color: var(--sc-text-muted);
    line-height: 1.7;
}

.sc-faq-answer p {
    margin: 0;
}

/* ---------- Footer ---------- */
.sc-footer {
    background: var(--sc-bg-alt);
    border-top: 1px solid var(--sc-border);
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--sc-text-muted);
}

.sc-footer p {
    margin: 4px 0;
}

.sc-footer a {
    color: var(--sc-primary);
    text-decoration: none;
}

.sc-footer a:hover {
    text-decoration: underline;
}

/* ---------- Content Pages (Privacy, etc.) ---------- */
.sc-content-page {
    max-width: 700px;
}

.sc-content-page h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 8px 0;
}

.sc-content-page h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 28px 0 12px 0;
    color: var(--sc-text);
}

.sc-content-page p {
    margin: 0 0 14px 0;
    color: var(--sc-text-muted);
    line-height: 1.7;
}

.sc-content-page ul {
    padding-left: 20px;
    margin: 0 0 14px 0;
}

.sc-content-page li {
    margin-bottom: 8px;
    color: var(--sc-text-muted);
    line-height: 1.6;
}

.sc-content-page a {
    color: var(--sc-primary);
    text-decoration: none;
}

.sc-content-page a:hover {
    text-decoration: underline;
}

.sc-updated {
    font-size: 0.85rem;
    color: var(--sc-text-muted);
    font-style: italic;
}

/* ---------- Error Page ---------- */
.sc-error-page {
    text-align: center;
    padding: 60px 20px;
}

.sc-error-icon {
    font-size: 4rem;
    color: var(--sc-error);
    margin-bottom: 16px;
}

.sc-error-page h1 {
    font-size: 1.8rem;
}

.sc-request-id {
    font-family: var(--sc-font-mono);
    font-size: 0.8rem;
    color: var(--sc-text-muted);
    margin-top: 16px;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Mobile: <= 480px */
@media (max-width: 480px) {
    .sc-hero {
        padding: 40px 16px;
    }

    .sc-hero-title {
        font-size: 1.75rem;
    }

    .sc-hero-subtitle {
        font-size: 1.05rem;
    }

    .sc-section {
        padding: 40px 0;
    }

    .sc-section-title {
        font-size: 1.4rem;
    }

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

    .sc-style-grid {
        grid-template-columns: 1fr;
    }

    .sc-steps {
        grid-template-columns: 1fr;
    }

    .sc-features-grid {
        grid-template-columns: 1fr;
    }

    .sc-upload-zone {
        padding: 28px 16px;
    }

    .sc-upload-icon {
        font-size: 2.2rem;
    }

    .sc-btn-convert {
        width: 100%;
        padding: 14px 20px;
    }

    .sc-alert {
        flex-direction: column;
        gap: 10px;
    }

    .sc-btn-download {
        margin-left: 0;
        display: block;
        margin-top: 10px;
        text-align: center;
    }
}

/* Tablet: 481px - 768px */
@media (min-width: 481px) and (max-width: 768px) {
    .sc-hero-title {
        font-size: 2rem;
    }

    .sc-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .sc-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Desktop: 769px+ */
@media (min-width: 769px) {
    .sc-hero {
        padding: 80px 20px;
    }

    .sc-hero-title {
        font-size: 3rem;
    }

    .sc-section {
        padding: 80px 0;
    }

    .sc-features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .sc-steps {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* ---------- Print ---------- */
@media print {
    .sc-header,
    .sc-footer,
    .sc-upload-zone,
    .sc-form-actions,
    .sc-style-panel {
        display: none;
    }
}
}