/* ============================================================
   Layout CSS: Top bar, hero, grid, navigation, footer
   ============================================================ */

/* ============================================================
   Top bar - Editorial masthead
   ============================================================ */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    z-index: 999;
    backdrop-filter: blur(12px) saturate(130%);
    background: linear-gradient(180deg,
            rgba(12, 16, 22, 0.94) 0%,
            rgba(16, 22, 30, 0.86) 100%);
    border-bottom: 1px solid var(--stroke);
    box-shadow: 0 6px 20px rgba(2, 8, 14, 0.24);
}

[data-theme="light"] .topbar {
    background: linear-gradient(180deg,
            rgba(249, 246, 239, 0.96) 0%,
            rgba(243, 237, 228, 0.9) 100%);
    border-bottom-color: rgba(145, 127, 102, 0.28);
    box-shadow: 0 4px 14px rgba(52, 44, 33, 0.12);
}

.topbar-inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 240px;
    user-select: none;
}

.sig {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border: 1px solid var(--stroke2);
    box-shadow: 0 0 0 2px rgba(99, 167, 255, 0.08);
}

.brand-title {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-title .kicker {
    font-family: var(--sans);
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--faint);
    font-weight: 700;
}

.brand-title .name {
    font-family: var(--sans);
    font-size: 13px;
    letter-spacing: 0.01em;
    color: var(--text);
    font-weight: 600;
}

.mast-progress {
    justify-self: center;
    border: 1px solid var(--stroke);
    border-radius: 999px;
    padding: 6px 14px;
    background: var(--card);
}

.mast-progress-label {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.top-actions {
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chip {
    border: 1px solid var(--stroke);
    background: var(--card);
    color: var(--muted);
    padding: 9px 12px;
    border-radius: 999px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.chip .dot {
    width: 7px;
    height: 7px;
    border-radius: 99px;
    background: var(--accent);
    flex: 0 0 auto;
}

.btn {
    cursor: pointer;
    border: 1px solid var(--stroke);
    background: var(--card2);
    color: var(--text);
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-family: var(--sans);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    user-select: none;
    font-weight: 700;
    transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:hover {
    border-color: var(--stroke2);
    background: var(--card3);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn.primary {
    border-color: rgba(99, 167, 255, 0.5);
    background: rgba(99, 167, 255, 0.12);
}

.btn.ghost {
    background: transparent;
}

.btn.small {
    padding: 7px 10px;
    font-size: 11px;
}

.btn.icon {
    width: 36px;
    height: 36px;
    padding: 0;
}

.btn-toc,
.toc-close {
    display: inline-flex;
}

.progress {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    background: rgba(170, 183, 193, 0.18);
    overflow: hidden;
}

.progress>i {
    display: block;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    transition: width 0.12s linear;
}

/* ============================================================
   Layout
   ============================================================ */
.wrap {
    position: relative;
    z-index: 1;
    padding-top: 72px;
}

/* ============================================================
   Hero - Editorial lead + systems panel
   ============================================================ */
.hero {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 124px 48px 92px;
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
    gap: 56px;
    align-items: start;
    min-height: 82vh;
    position: relative;
}

/* ── Hero background image with luminance vignette ── */
.hero-bg {
    position: absolute;
    inset: -60px 0;
    z-index: -2;
    background: url('../img/hero-bg.jpg') center center / cover no-repeat;
    opacity: 0;
    transition: opacity 2.0s var(--ease-out);
    pointer-events: none;
}

/* Luminance mask: bright at top & bottom edges, dark in the middle */
.hero-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(to bottom,
            transparent 0%,
            rgba(14, 18, 22, 0.35) 15%,
            rgba(14, 18, 22, 0.78) 30%,
            rgba(14, 18, 22, 0.94) 42%,
            rgba(14, 18, 22, 0.94) 58%,
            rgba(14, 18, 22, 0.78) 70%,
            rgba(14, 18, 22, 0.35) 85%,
            transparent 100%);
    pointer-events: none;
}

/* Lateral fade so image doesn't bleed past content edges */
.hero-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        linear-gradient(to right,
            transparent 0%,
            rgba(14, 18, 22, 0.2) 6%,
            transparent 18%,
            transparent 82%,
            rgba(14, 18, 22, 0.2) 94%,
            transparent 100%);
    pointer-events: none;
}

[data-theme="light"] .hero-bg::after {
    background:
        linear-gradient(to bottom,
            transparent 0%,
            rgba(244, 241, 234, 0.45) 12%,
            rgba(244, 241, 234, 0.82) 28%,
            rgba(244, 241, 234, 0.96) 42%,
            rgba(244, 241, 234, 0.96) 58%,
            rgba(244, 241, 234, 0.82) 72%,
            rgba(244, 241, 234, 0.45) 88%,
            transparent 100%);
}

[data-theme="light"] .hero-bg::before {
    background:
        linear-gradient(to right,
            transparent 0%,
            rgba(244, 241, 234, 0.3) 8%,
            transparent 20%,
            transparent 80%,
            rgba(244, 241, 234, 0.3) 92%,
            transparent 100%);
}

[data-theme="light"] .hero-bg {
    opacity: 0;
    filter: brightness(1.1) saturate(0.8);
}

.hero-copy {
    max-width: 70ch;
}

.hero-meta {
    margin-top: 8px;
}

@media (max-width: 1200px) {
    .hero {
        padding: 112px 40px 82px;
        gap: 44px;
        grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    }
}

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 94px 32px 74px;
        min-height: auto;
        gap: 30px;
    }

    .hero-copy {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 78px 24px 58px;
        gap: 24px;
    }
}

.eyebrow {
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.eyebrow::before {
    content: "";
    width: 28px;
    height: 1px;
    background: linear-gradient(90deg, var(--accent), transparent);
}

.hero h1 {
    font-family: var(--display);
    font-weight: 760;
    margin: 0 0 22px;
    letter-spacing: -0.025em;
    line-height: 0.95;
    font-size: clamp(44px, 5.8vw, 86px);
}

.grad {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.lede {
    font-size: clamp(1.08rem, 1.3vw, 1.28rem);
    color: var(--muted);
    max-width: 56ch;
    margin-bottom: 32px;
    line-height: 1.74;
}

.fineprint {
    font-size: 14px;
    color: var(--faint);
    max-width: 72ch;
    margin-top: 22px;
    line-height: 1.72;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.hero-card {
    border: 1px solid var(--stroke2);
    border-radius: var(--radius2);
    background: var(--card2);
    box-shadow: var(--shadow);
    padding: 28px;
    position: relative;
    overflow: hidden;
}

@media (max-width: 768px) {
    .hero-card {
        padding: 22px;
    }
}

.hero-card::before,
.hero-card::after {
    content: "";
    position: absolute;
    width: 22px;
    height: 22px;
    opacity: 0.68;
    pointer-events: none;
}

.hero-card::before {
    top: 10px;
    left: 10px;
    border-top: 1px solid var(--stroke2);
    border-left: 1px solid var(--stroke2);
}

.hero-card::after {
    right: 10px;
    bottom: 10px;
    border-right: 1px solid var(--stroke2);
    border-bottom: 1px solid var(--stroke2);
}

[data-theme="light"] .hero-card {
    border-color: rgba(145, 127, 102, 0.4);
    background: rgba(255, 255, 255, 0.82);
    box-shadow: var(--shadow);
}

.hero-card>* {
    position: relative;
    z-index: 1;
}

.hero-card h3 {
    margin: 0 0 10px;
    font-family: var(--sans);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--muted);
    font-weight: 700;
}

.hero-card p {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 14px;
    line-height: 1.7;
}

.hero-card ul {
    margin-left: 18px;
    margin-top: 10px;
}

.hero-card li {
    color: var(--muted);
    margin: 7px 0;
}

.fast-track {
    font-size: 13px;
    color: var(--faint);
    font-family: var(--sans);
    letter-spacing: 0.01em;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 16px;
}

.fast-track a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 12px;
    letter-spacing: 0.04em;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.fast-track a:hover {
    border-bottom-color: var(--accent);
}

@media (max-width: 600px) {
    .fast-track {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}

details.hero-card summary {
    cursor: pointer;
    list-style: none;
}

details.hero-card summary::-webkit-details-marker {
    display: none;
}

details.hero-card summary h3 {
    display: inline;
}

details.hero-card summary h3::after {
    content: ' +';
    font-weight: 400;
    color: var(--faint);
    font-size: 14px;
    margin-left: 4px;
}

details[open].hero-card summary h3::after {
    content: ' −';
}

.hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}

.stat {
    border: 1px solid var(--stroke);
    border-radius: var(--radius);
    padding: 16px;
    background: var(--card);
    transition: all 0.3s var(--ease);
}

.stat:hover {
    border-color: var(--stroke2);
    transform: translateY(-1px);
}

[data-theme="light"] .stat {
    background: rgba(255, 255, 255, 0.82);
    border-color: rgba(145, 127, 102, 0.34);
}

.stat .n {
    font-family: var(--mono);
    font-size: 13px;
    color: var(--text);
    letter-spacing: -0.01em;
    font-weight: 600;
}

.stat .l {
    font-size: 12px;
    color: var(--faint);
    margin-top: 4px;
    line-height: 1.3;
}

/* ============================================================
   Grid layout
   ============================================================ */
.grid {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 48px 160px;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    align-items: start;
}

@media (max-width: 1200px) {
    .grid {
        grid-template-columns: minmax(0, 1fr);
        gap: 32px;
        padding: 0 40px 128px;
    }
}

@media (max-width: 1024px) {
    .grid {
        grid-template-columns: 1fr;
        gap: 34px;
        padding: 0 32px 100px;
    }

    .btn-toc {
        display: inline-flex;
    }
}

@media (max-width: 768px) {
    .grid {
        padding: 0 24px 80px;
    }

    .topbar-inner {
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 10px;
    }

    .mast-progress {
        display: none;
    }

    .brand-title .name {
        font-size: 12px;
    }
}

/* Full-bleed stage for demos */
.stage {
    margin-inline: calc(50% - 50vw);
    padding-inline: clamp(20px, 4vw, 64px);
    overflow: clip;
}

.stage>.stage-inner {
    max-inline-size: min(1600px, 100%);
    margin-inline: auto;
}

.stage canvas,
.stage svg,
.stage img,
.stage video {
    inline-size: 100%;
    max-inline-size: 100%;
    block-size: auto;
    display: block;
}

/* Focus mode */
body.focus .grid {
    grid-template-columns: 1fr;
}

body.focus .toc {
    display: none;
}

/* Theatre mode */
body.theatre .grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
}

body.theatre .stage {
    padding-inline: clamp(16px, 4.4vw, 68px);
}

body.theatre canvas {
    height: min(58vh, 540px);
}

.toc {
    position: fixed;
    top: 72px;
    left: 0;
    bottom: 0;
    width: min(360px, 88vw);
    border-radius: 0;
    transform: translateX(-104%);
    transition: transform 0.28s var(--ease-out);
    z-index: 998;
    overflow-y: auto;
}

body.toc-open .toc {
    transform: translateX(0);
}

body.toc-open::after {
    content: "";
    position: fixed;
    inset: 72px 0 0 0;
    background: rgba(2, 8, 14, 0.48);
    z-index: 997;
}

[data-theme="light"] body.toc-open::after {
    background: rgba(52, 44, 33, 0.26);
}

@media (max-width: 1024px) {
    .toc-close {
        margin: 0 0 16px;
    }

    body.theatre .grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   Atmospheric layer
   ============================================================ */
#atmo {
    position: fixed;
    inset: -40px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.52;
    filter: blur(54px) saturate(118%);
    mix-blend-mode: screen;
    background:
        radial-gradient(780px 560px at var(--px, 55%) var(--py, 32%), rgba(99, 167, 255, 0.1), transparent 62%),
        radial-gradient(840px 580px at calc(var(--px, 55%) + 20%) calc(var(--py, 32%) + 10%), rgba(217, 142, 95, 0.08), transparent 64%),
        radial-gradient(980px 700px at calc(var(--px, 55%) - 18%) calc(var(--py, 32%) + 18%), rgba(120, 181, 135, 0.06), transparent 66%);
    transition: opacity 0.8s ease;
}

[data-theme="light"] #atmo {
    mix-blend-mode: normal;
    opacity: 0.4;
    filter: blur(56px) saturate(110%);
}

@media (prefers-reduced-motion: reduce) {
    #atmo {
        display: none;
    }
}

/* ============================================================
   Footer
   ============================================================ */
footer {
    border-top: 1px solid var(--stroke);
    background: linear-gradient(180deg, var(--bg2), var(--bg3) 68%);
    padding: 72px 48px;
    margin-top: 92px;
}

.footgrid {
    max-width: var(--maxw);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
}

.foot-section {
    border-top: 1px solid var(--stroke);
    padding-top: 20px;
}

@media (max-width: 1024px) {
    footer {
        padding: 58px 40px;
        margin-top: 80px;
    }

    .footgrid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    footer {
        padding: 48px 24px;
        margin-top: 60px;
    }

    .footgrid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.footgrid h4 {
    margin: 0 0 14px;
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.footgrid p,
.footgrid li {
    color: var(--muted);
    font-size: 14.5px;
    line-height: 1.76;
}

.footgrid ul {
    margin: 0 0 0 18px;
}

.foot-links a {
    color: var(--accent);
}