/* =====================================================
   1807-chain — ai.css (v1.1)
   Page styles for ai.html
   - Hero with image banner
   - Luna Mega Spotlight (flagship)
   - Cards grid + chips
   - Architecture grid
   - Gallery strip
   - CTA section
   - Responsive tiers
   ===================================================== */

:root {
    --ai-gap: clamp(12px, 2.2vw, 20px);
    --ai-radius: var(--radius-lg, 16px);
    --ai-card-bg: color-mix(in srgb, var(--surface-2, #151a1f) 86%, transparent);
    --ai-card-bg-active: color-mix(in srgb, var(--surface-2, #151a1f) 92%, transparent);
    --ai-blur: 6px;
    --ai-blur-strong: 10px;
}

/* ------------------------------ HERO ------------------------------ */
.page-hero {
    position: relative;
    padding: clamp(16px, 3vw, 28px) 0;
    overflow: hidden;
}

.page-hero__media {
    position: relative;
    max-width: min(1100px, 94vw);
    margin: 0 auto;
}

.page-hero .hero-image {
    display: block;
    width: 100%;
    height: clamp(340px, 60vh, 720px);
    object-fit: cover;
    border-radius: var(--ai-radius);
    border: 1px solid var(--border);
    filter: grayscale(14%) contrast(1.05);
}

.page-hero__content {
    position: relative;
    z-index: 2;
    max-width: 980px;
    margin: clamp(10px, 2.4vw, 18px) auto 0;
    text-align: center;
}

.page-title {
    margin: 0 0 .35em 0;
    font-size: clamp(1.75rem, 2.6vw, 2.6rem);
    line-height: 1.15;
    font-weight: 800;
    background: linear-gradient(180deg, var(--text) 0%, var(--blue-400) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.page-subtitle {
    color: var(--accent-2);
    max-width: 72ch;
    margin: 0 auto;
}

/* ------------------------------ STATS ------------------------------ */
.section {
    padding: clamp(28px, 5vw, 56px) 0;
}

.container {
    max-width: min(1100px, 92vw);
    margin: 0 auto;
    padding: 0 clamp(12px, 2.6vw, 20px);
}

.section--stats .stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--ai-gap);
}

.stat {
    background: var(--ai-card-bg);
    border: 1px solid var(--border);
    border-radius: var(--ai-radius);
    padding: clamp(14px, 2vw, 18px);
    text-align: center;
}

.stat__num {
    font-size: clamp(1.1rem, 3.2vw, 1.6rem);
    font-weight: 800;
    color: var(--text);
}

.stat__label {
    color: var(--muted);
}

/* ------------------------------ LUNA SPOTLIGHT ------------------------------ */
.section--spotlight {
    padding-top: clamp(12px, 2.5vw, 24px);
}

.spotlight {
    display: grid;
    grid-template-columns: 1.2fr 1.6fr;
    gap: clamp(16px, 3vw, 28px);
    align-items: center;
    background: var(--ai-card-bg);
    border: 1px solid var(--border);
    border-radius: var(--ai-radius);
    box-shadow: var(--shadow);
    padding: clamp(14px, 2.6vw, 24px);
}

.spotlight__media {
    aspect-ratio: 16/10;
    overflow: clip;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: linear-gradient(135deg, var(--primary-soft), var(--secondary-soft));
}

.spotlight__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: saturate(1.03) contrast(1.02);
}

.spotlight__title {
    margin: 4px 0 8px 0;
    font-size: clamp(1.4rem, 2.4vw, 2rem);
    font-weight: 900;
    background: linear-gradient(180deg, var(--text) 0%, var(--blue-400) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.spotlight__lead {
    color: var(--accent-2);
    margin: 0 0 10px 0;
    max-width: 70ch;
}

.spotlight__bullets {
    margin: 10px 0 14px 0;
    padding-left: 1.1rem;
    color: var(--text);
}

.spotlight__bullets li {
    margin: .25rem 0;
}

.spotlight__ctas {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    letter-spacing: .2px;
}

.badge--mega {
    padding: 6px 10px;
    border-radius: var(--radius-pill);
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: var(--white);
    border: 1px solid var(--border);
    box-shadow: 0 6px 18px rgba(37, 99, 235, .25);
}

/* ------------------------------ CARDS ------------------------------ */
.section-title {
    font-size: clamp(1.4rem, 2.2vw, 2rem);
    margin: 0 0 .75rem 0;
}

.cards-grid--projects {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--ai-gap);
}

.card {
    position: relative;
    display: grid;
    grid-template-rows: auto 1fr;
    border-radius: var(--ai-radius);
    overflow: clip;
    border: 1px solid var(--border);
    background: var(--ai-card-bg);
    -webkit-backdrop-filter: blur(var(--ai-blur));
    backdrop-filter: blur(var(--ai-blur));
}

.card__media {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: saturate(1.05) contrast(1.02);
}

.card__body {
    padding: clamp(12px, 2vw, 18px);
    display: grid;
    gap: .5rem;
}

.card__title {
    font-size: clamp(1.05rem, 1.6vw, 1.25rem);
    margin: 0;
}

.card__title a {
    color: inherit;
    text-decoration: none;
}

.card__title a:hover {
    color: var(--blue-400);
}

.card__desc {
    color: var(--accent-2);
    margin: 0;
}

.chipset {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: .25rem 0 0 0;
}

.chip {
    font-size: .85rem;
    padding: .25rem .5rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: color-mix(in srgb, var(--surface-2) 78%, transparent);
}

.card:hover {
    border-color: var(--blue-400);
    box-shadow: 0 8px 22px rgba(96, 165, 250, .18);
}

.card:hover .card__media img {
    transform: scale(1.02);
    transition: transform .4s ease;
}

/* ------------------------------ ARCH GRID ------------------------------ */
.arch-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--ai-gap);
}

.arch-card {
    background: var(--ai-card-bg);
    border: 1px solid var(--border);
    border-radius: var(--ai-radius);
    padding: clamp(14px, 2vw, 18px);
    display: grid;
    gap: .35rem;
    -webkit-backdrop-filter: blur(var(--ai-blur));
    backdrop-filter: blur(var(--ai-blur));
}

.arch-card__title {
    font-size: 1rem;
    margin: 0;
}

.arch-card__text {
    color: var(--accent-2);
    margin: 0;
}

/* ------------------------------ GALLERY ------------------------------ */
.section--gallery {
    background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--surface-2) 45%, transparent));
    padding-top: clamp(12px, 2vw, 18px);
}

.gallery-strip {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(220px, 1fr);
    gap: var(--ai-gap);
    overflow-x: auto;
    padding: 6px var(--ai-gap) 2px;
    scroll-snap-type: x mandatory;
}

.gallery-item {
    scroll-snap-align: start;
    border-radius: var(--ai-radius);
    overflow: clip;
    border: 1px solid var(--border);
    background: var(--ai-card-bg);
}

.gallery-item img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ------------------------------ CTA ------------------------------ */
.section--cta .lead {
    color: var(--accent-2);
    max-width: 72ch;
}

.hero-ctas {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* ------------------------------ ACTIVE EMPHASIS ------------------------------ */
.card.active {
    background: var(--ai-card-bg-active);
    -webkit-backdrop-filter: blur(var(--ai-blur-strong));
    backdrop-filter: blur(var(--ai-blur-strong));
}

/* ------------------------------ RESPONSIVE ------------------------------ */
@media (max-width:1024px) {
    .arch-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .spotlight {
        grid-template-columns: 1fr;
    }

    .spotlight__media {
        order: -1;
        aspect-ratio: 16/9;
    }
}

@media (max-width:860px) {
    .cards-grid--projects {
        grid-template-columns: 1fr;
    }
}

@media (max-width:640px) {
    .section--stats .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .page-hero .hero-image {
        height: clamp(260px, 48vh, 520px);
    }
}

@media (max-width:480px) {
    .gallery-strip {
        grid-auto-columns: minmax(180px, 1fr);
    }
}