/* Learn Hub: light, editorial learner index aligned with the shared design system. */
.learn-hub-page {
    --learn-primary: var(--brand-action, #e96745);
    --learn-primary-hover: var(--brand-action-hover, #dc5b39);
    --learn-primary-ink: var(--brand-action-ink, #a63b26);
    --learn-brand: var(--brand-coral, #ff7a59);
    --learn-canvas: var(--bg-color, #fff9f5);
    --learn-surface: var(--bg-white, #ffffff);
    --learn-soft: var(--bg-warm, #faf9f7);
    --learn-primary-soft: #fff1eb;
    --learn-text: var(--text-color, #1a1a1a);
    --learn-secondary: var(--text-secondary, #374151);
    --learn-muted: var(--text-muted, #6b7280);
    --learn-line: var(--border-dark, #dee2e6);
    --learn-line-strong: #c9cfd6;

    min-height: 70vh;
    background: var(--learn-canvas);
    color: var(--learn-text);
    color-scheme: light;
    font-family: var(--font-primary, "Google Sans", "Noto Sans Thai", system-ui, sans-serif);
}

.learn-hub-shell {
    width: min(calc(100% - 40px), 1120px);
    margin: 0 auto;
}

.learn-hub-hero {
    padding: 52px 0 43px;
    border-top: 1px solid var(--learn-line);
    border-bottom: 1px solid var(--learn-line);
    background: var(--learn-canvas);
}

.learn-hub-hero-copy {
    max-width: 760px;
}

.learn-hub-hero h1 {
    margin: 0 0 12px;
    color: var(--learn-text);
    font-size: clamp(2.2rem, 5vw, 3.25rem);
    font-weight: 700;
    letter-spacing: -.04em;
    line-height: 1.12;
}

.learn-hub-hero p {
    max-width: 700px;
    margin: 0;
    color: var(--learn-secondary);
    font-size: 1.125rem;
    line-height: 1.75;
}

.learn-hub-content {
    padding: 42px 0 76px;
}

.learn-hub-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 20px;
}

.learn-hub-heading h2 {
    margin: 0;
    color: var(--learn-text);
    font-size: clamp(1.35rem, 3vw, 1.65rem);
    font-weight: 700;
    letter-spacing: -.025em;
    line-height: 1.3;
}

.learn-hub-total {
    flex: 0 0 auto;
    margin: 0;
    color: var(--learn-muted);
    font-size: .9375rem;
}

.learn-hub-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.learn-topic-card {
    min-width: 0;
    min-height: 250px;
    overflow: hidden;
    border: 1px solid var(--learn-line-strong);
    border-radius: 8px;
    background: var(--learn-surface);
    transition: border-color .15s ease, transform .15s ease;
}

.learn-topic-link {
    display: flex;
    height: 100%;
    padding: 24px;
    color: inherit;
    flex-direction: column;
    text-decoration: none;
}

.learn-topic-card:hover {
    border-color: var(--learn-brand);
    transform: translateY(-2px);
}

.learn-topic-link:hover {
    color: inherit;
    text-decoration: none;
}

.learn-topic-link:focus-visible {
    border-radius: 7px;
    outline: 3px solid var(--learn-primary);
    outline-offset: -3px;
}

.learn-topic-icon {
    display: grid;
    width: 46px;
    height: 46px;
    margin-bottom: 20px;
    border: 1px solid #ffc5b6;
    border-radius: 6px;
    background: var(--learn-primary-soft);
    color: var(--learn-primary-hover);
    font-size: 1.25rem;
    place-items: center;
}

.learn-topic-card h3 {
    margin: 0 0 9px;
    color: var(--learn-text);
    font-size: 1.1875rem;
    font-weight: 700;
    letter-spacing: -.015em;
    line-height: 1.4;
}

.learn-topic-description {
    display: -webkit-box;
    overflow: hidden;
    margin: 0;
    color: var(--learn-secondary);
    font-size: 1rem;
    line-height: 1.7;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
}

.learn-topic-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-top: auto;
    padding-top: 22px;
    border-top: 1px solid var(--learn-line);
}

.learn-topic-count,
.learn-topic-action {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: .9375rem;
    font-weight: 650;
}

.learn-topic-count {
    color: var(--learn-muted);
}

.learn-topic-action {
    color: var(--learn-primary-ink);
}

.learn-topic-action i {
    transition: transform .15s ease;
}

.learn-topic-card:hover .learn-topic-action i {
    transform: translateX(3px);
}

.learn-hub-empty {
    padding: 52px 24px;
    border: 1px solid var(--learn-line-strong);
    border-radius: 8px;
    background: var(--learn-surface);
    color: var(--learn-secondary);
    text-align: center;
}

.learn-hub-empty-icon {
    display: grid;
    width: 48px;
    height: 48px;
    margin: 0 auto 14px;
    border: 1px solid #ffc5b6;
    border-radius: 6px;
    background: var(--learn-primary-soft);
    color: var(--learn-primary-hover);
    font-size: 1.25rem;
    place-items: center;
}

.learn-hub-empty p {
    margin: 0;
    font-size: 1rem;
    line-height: 1.7;
}

@media (max-width: 900px) {
    .learn-hub-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .learn-hub-shell {
        width: min(calc(100% - 30px), 1120px);
    }

    .learn-hub-hero {
        padding: 35px 0 31px;
    }

    .learn-hub-hero p {
        font-size: 1.0625rem;
    }

    .learn-hub-content {
        padding: 32px 0 56px;
    }

    .learn-hub-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 5px;
    }

    .learn-hub-grid {
        grid-template-columns: 1fr;
    }

    .learn-topic-card {
        min-height: 0;
    }

    .learn-topic-link {
        padding: 21px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .learn-topic-card,
    .learn-topic-action i {
        transition: none;
    }
}