/* ── SEO Learn Pages Shared Styles ─────────────────────────────────────── */

/* ── Layout ── */
.seo-nav {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    background: var(--surface-container-low);
    z-index: 50;
}

.seo-nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--on-surface);
}

.seo-nav-brand:hover {
    text-decoration: none;
}

.seo-nav-brand img {
    height: 36px;
    width: auto;
    vertical-align: middle;
}

.seo-nav-brand span {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.seo-nav-link {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    color: var(--on-primary, #fff);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-full);
    background: var(--primary, #0058bc);
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
    margin-left: auto;
    margin-right: 0.35rem;
}

.seo-nav-link:hover {
    background: var(--primary-container, #00479a);
    color: var(--on-primary, #fff);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(0, 88, 188, 0.25);
}

.seo-cta-btn {
    display: inline-block;
    background: var(--primary);
    color: var(--on-primary);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-full);
    text-decoration: none;
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
    border: none;
    cursor: pointer;
}

.seo-cta-btn:hover {
    background: var(--primary-container);
    color: var(--on-primary);
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 88, 188, 0.25);
}

.seo-container {
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 1.5rem 4rem;
}

/* ── Hero ── */
.seo-hero {
    text-align: center;
    padding: 4.5rem 1rem 3.5rem;
}

.seo-hero h1 {
    font-size: clamp(2rem, 5vw, 2.8rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--on-surface);
    margin-bottom: 0.75rem;
    line-height: 1.15;
}

.seo-hero-meta {
    font-size: 0.9rem;
    color: var(--outline);
    margin-bottom: 1.5rem;
}

.seo-hero-desc {
    font-size: 1.15rem;
    color: var(--outline);
    line-height: 1.6;
    max-width: 480px;
    margin: 0 auto;
}

/* ── Content sections ── */
.seo-content {
    margin-top: 2.5rem;
}

.seo-content h2 {
    font-size: clamp(1.4rem, 3.5vw, 1.9rem);
    font-weight: 700;
    color: var(--on-surface);
    margin: 3rem 0 1.25rem;
    letter-spacing: -0.02em;
    scroll-margin-top: 5rem;
}

.seo-content h3 {
    font-size: clamp(1.2rem, 3vw, 1.4rem);
    font-weight: 600;
    color: var(--on-surface);
    margin: 2rem 0 0.5rem;
    scroll-margin-top: 5rem;
}

.seo-content h3 + p {
    margin-bottom: 1rem;
}

.seo-content p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--on-surface-variant);
    margin-bottom: 1.25rem;
}

.seo-content ul,
.seo-content ol {
    margin: 1rem 0 1.5rem 1.5rem;
    line-height: 1.6;
    color: var(--on-surface-variant);
}

.seo-content li {
    margin-bottom: 0.5rem;
}

.seo-content strong {
    font-weight: 600;
    color: var(--on-surface);
}

.seo-content code {
    background: var(--surface-container-highest);
    padding: 0.15rem 0.35rem;
    border-radius: var(--radius-xs);
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

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

.seo-content a:hover {
    color: var(--primary-container);
}

.seo-content blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--outline);
}

/* ── Utility block ── */
.utility-block {
    background: var(--surface-container-low);
    border-radius: var(--radius-xl);
    padding: 2rem;
    margin: 2.5rem 0;
    box-shadow: var(--shadow-card);
}

.utility-block-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--on-surface);
    margin-bottom: 1.25rem;
    text-align: center;
}

/* ── Deck widget (vocab lists) ── */
.deck-widget {
    margin: 2rem 0;
}

.deck-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
}

.deck-tab {
    background: var(--surface-container);
    border: 1px solid var(--outline-variant);
    color: var(--on-surface-variant);
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    flex: 0 0 auto;
    min-height: 44px;
    text-align: center;
    max-width: 100%;
}

.deck-tab:hover {
    background: var(--surface-container-high);
    border-color: var(--outline);
}

.deck-tab.active {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

.deck-tab .count {
    opacity: 0.7;
    margin-left: 0.25rem;
}

/* Pill selector for words */
.deck-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    justify-content: center;
}

.deck-pill {
    background: #fff;
    border: 1px solid var(--outline-variant);
    color: var(--on-surface);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.deck-pill:hover {
    background: var(--surface-container-high);
    border-color: var(--outline);
}

.deck-pill.active {
    background: var(--primary);
    color: var(--on-primary);
    border-color: var(--primary);
}

/* Card view container */
.deck-card-view {
    max-width: 640px;
    margin: 0 auto 1.5rem;
}

.deck-card-view .card {
    margin-bottom: var(--space-4);
}

/* TTS button styling for deck widget */
.deck-card-view .word-card-tts.tts-speaking,
.deck-card-view .word-card-tts-example.tts-speaking {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.deck-widget-cta {
    text-align: center;
    margin-top: 2rem;
    padding: var(--space-6);
    background: var(--surface-container-low);
    border-radius: var(--radius-lg);
    border: 1px solid var(--outline-variant);
}

.deck-widget-cta p {
    margin-bottom: 1rem;
    color: var(--on-surface);
    font-weight: 500;
}

.deck-widget-cta .seo-cta-btn {
    background: var(--primary);
    color: var(--on-primary);
}

/* ── CTA sections ── */
.seo-cta-section {
    text-align: center;
    margin: 3.5rem 0;
    padding: 2.5rem 1.5rem;
    background: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-xl);
}

.seo-cta-section h2 {
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 700;
    color: var(--on-surface);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.seo-cta-section p {
    color: var(--on-surface-variant);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.seo-cta-section .seo-cta-btn {
    background: var(--primary);
    color: var(--on-primary);
}

.seo-cta-section .seo-cta-btn:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 16px rgba(0, 88, 188, 0.2);
}

/* ── Footer ── */
.seo-footer {
    margin-top: 3rem;
    background: var(--surface-container-low);
    color: var(--outline);
    font-size: 0.85rem;
}

.seo-footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.75rem 6rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.seo-footer-links {
    display: flex;
    gap: 1.5rem;
}

.seo-footer-links a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    padding: 0 0.25rem;
    color: var(--outline);
    text-decoration: none;
}

.seo-footer-links a:hover {
    color: var(--on-surface);
    text-decoration: underline;
}

/* ── Resource cards (index page) ── */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.resource-card {
    border: 1px solid var(--outline-variant, #ddd);
    border-radius: var(--radius-lg, 12px);
    padding: 1.5rem;
    background: var(--surface-container-lowest, #fff);
    transition: box-shadow 0.2s, transform 0.15s;
}

.resource-card:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}

.resource-card h3 {
    margin: 0 0 0.5rem;
    font-size: 1.15rem;
    font-weight: 600;
}

.resource-card h3 a {
    color: inherit;
    text-decoration: none;
}

.resource-card h3 a:hover {
    color: var(--primary);
}

.resource-card p {
    margin: 0 0 1rem;
    color: var(--on-surface-variant, #555);
    font-size: 0.95rem;
    line-height: 1.6;
}

.resource-card a {
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
}

.resource-card a:hover {
    text-decoration: underline;
}

/* ── Mistake tip cards ── */

.mistake-tips {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0 2rem;
}

.mistake-tip {
    border: 1px solid var(--outline-variant, #e0e0e0);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    background: var(--surface-container-lowest, #fafafa);
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.mistake-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--on-surface-variant, #666);
    margin-bottom: 0.6rem;
}

.mistake-dont,
.mistake-do {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    line-height: 1.5;
    padding: 0.3rem 0;
}

.mistake-dont .material-symbols-outlined,
.mistake-do .material-symbols-outlined {
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 0.15rem;
}

.mistake-dont {
    color: var(--on-surface-variant, #777);
}

.mistake-dont-text {
    text-decoration: line-through;
    text-decoration-color: rgba(0,0,0,0.2);
}

.mistake-dont .material-symbols-outlined {
    color: var(--error, #c62828);
    text-decoration: none;
}

.mistake-do {
    color: var(--on-surface, #1a1a1a);
    font-weight: 500;
}

.mistake-do .material-symbols-outlined {
    color: var(--tertiary, #2e7d32);
}

/* ── Table styling (HIGH PRIORITY) ── */

/* Chart container */
.seo-content .seo-chart-wrap {
    margin: 1.5rem 0 2rem;
    padding: 1rem;
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-lg);
    background: var(--surface-container-lowest);
    box-shadow: var(--shadow-ghost);
}

.seo-content .seo-chart-wrap svg {
    width: 100%;
    height: auto;
    display: block;
}

/* Table container wrapper for horizontal scroll on mobile */
.seo-content .seo-table-wrap {
    overflow-x: auto;
    margin: 1rem 0 2rem;
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-lg);
    background: var(--surface-container-lowest);
    box-shadow: var(--shadow-ghost);
}

.seo-content table {
    width: 100%;
    min-width: 680px;
    border-collapse: separate;
    border-spacing: 0;
    background: transparent;
}

/* Cell padding and typography */
.seo-content th,
.seo-content td {
    padding: 0.875rem 1rem;
    vertical-align: top;
    text-align: left;
    line-height: 1.55;
}

.seo-content th {
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.seo-content td {
    font-size: 0.95rem;
    color: var(--on-surface);
}

/* Header treatment, row separators, and zebra striping */
.seo-content thead th {
    background: var(--surface-container);
    color: var(--on-surface);
    border-bottom: 1px solid var(--outline-variant);
    position: sticky;
    top: 0;
    z-index: 1;
}

.seo-content tbody td {
    border-bottom: 1px solid var(--outline-variant);
}

.seo-content tbody tr:nth-child(even) {
    background: rgba(0, 88, 188, 0.03);
}

.seo-content tbody tr:hover {
    background: rgba(0, 88, 188, 0.06);
}

/* ── Table styling (MEDIUM PRIORITY) ── */

/* Word column emphasis (2nd column) */
.seo-content tbody td:nth-child(2) {
    font-weight: 600;
    color: var(--on-surface);
}

/* CEFR column emphasis (5th column) */
.seo-content tbody td:nth-child(5) {
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

/* Article text rhythm */
.seo-content p,
.seo-content li {
    max-width: 68ch;
}

/* ── Table styling (LOW PRIORITY) ── */

/* Example column italic and muted (4th column) */
.seo-content tbody td:nth-child(4) {
    color: var(--on-surface-variant);
    font-style: italic;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .seo-nav {
        padding: 1.25rem 1.5rem;
    }
    
    .seo-cta-btn {
        font-size: 0.95rem;
        padding: 0.55rem 1.25rem;
        min-height: 44px;
    }
    
    .seo-container {
        padding: 0 1.5rem 3rem;
    }
    
    /* Mobile chart adjustments */
    .seo-content .seo-chart-wrap {
        margin-inline: -0.25rem;
        padding: 0.75rem 0.5rem;
    }

    .seo-content .seo-chart-wrap svg text {
        font-size: 11px;
    }

    /* Mobile table adjustments */
    .seo-content .seo-table-wrap {
        margin-inline: -0.25rem;
        padding-bottom: 0.25rem;
    }

    .seo-content th,
    .seo-content td {
        padding: 0.75rem 0.875rem;
        font-size: 0.9rem;
    }

    .seo-content td:first-child,
    .seo-content th:first-child,
    .seo-content td:last-child,
    .seo-content th:last-child {
        white-space: nowrap;
    }
    
    .seo-hero {
        padding: 2.5rem 0.5rem 2rem;
    }
    
    .seo-hero h1 {
        font-size: 1.6rem;
    }
    
    .seo-hero-desc {
        font-size: 0.95rem;
    }
    
    .utility-block {
        padding: 1.5rem 1rem;
    }
    
    /* min-height: 44px already applied in base .deck-tab style */
    
    .deck-pill {
        min-height: 44px;
        padding: 10px 14px;
    }
    
    .seo-footer-inner {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
        padding: 1.25rem 1rem;
    }
    
    .seo-footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.5rem;
    }
}

/* ── References Section ── */
.references {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--outline-variant, #ddd);
}

.references h2 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--on-surface);
}

.references ul {
    list-style: none;
    padding: 0;
}

.references li {
    font-size: 0.8125rem;
    color: var(--on-surface-variant, #666);
    margin-bottom: 0.5rem;
    line-height: 1.5;
}



/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
    .resource-card,
    .seo-nav-link,
    .seo-cta-btn {
        transition: none !important;
        transform: none !important;
    }
}