/* ============================================
   FEATURES PAGE
   Page-specific layout for the features/functionalities page.
   Reuses .landing-section, .landing-cta, .icon-list, .highlight-block,
   .alert-inline from landing.css, ui-components.css, manifesto.css, terms.css.
   ============================================ */

/* === Page wrapper === */
.features-page {
    width: 100%;
}

/* === Hero: offset for topbar === */
.features-page__hero {
    padding-top: calc(var(--topbar-height) + var(--spacing-2xl));
    text-align: center;
}

.features-page__hero .landing-section__container {
    max-width: 800px;
}

.features-page__title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    line-height: var(--line-height-tight);
}

.features-page__hero .lead {
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

/* === CTA section === */
.features-page__cta {
    padding-top: var(--spacing-2xl);
}

.features-page__cta .section-overline {
    display: block;
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   CONCEPT CARDS — Trio de cartes (Œuvre / Chapitre / Branche)
   ============================================ */
.concept-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.concept-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.concept-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.concept-card__icon {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.concept-card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-sm);
}

.concept-card__text {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
    margin: 0;
}

/* ============================================
   SPLIT FEATURE — Two-column layout for side-by-side content
   ============================================ */
.split-feature {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
    margin: var(--spacing-xl) 0;
}

/* Block variant: icon + title + description */
.split-feature__block {
    text-align: center;
    padding: var(--spacing-lg);
}

.split-feature__icon {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

/* Section variant: full sub-section with overline + title */
.split-feature__section {
    padding: var(--spacing-lg);
}

.split-feature__section .section-overline {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.split-feature__section .section-title {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

/* ============================================
   ILLUSTRATION PLACEHOLDER — Image placeholder areas
   ============================================ */
.features-page__illustration {
    display: flex;
    justify-content: center;
    margin: var(--spacing-xl) 0 var(--spacing-md);
}

.illustration-placeholder {
    width: 280px;
    height: 180px;
    background: var(--color-gray-100);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-2xl);
}

.illustration-placeholder--wide {
    width: 400px;
    height: 200px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
    .concept-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .split-feature {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .illustration-placeholder,
    .illustration-placeholder--wide {
        width: 100%;
        max-width: 320px;
    }
}

@media (max-width: 768px) {
    .features-page__hero {
        padding-top: calc(var(--topbar-height) + var(--spacing-xl));
    }

    .split-feature__block,
    .split-feature__section {
        padding: var(--spacing-md);
    }

    .illustration-placeholder {
        height: 140px;
    }
}