/* ============================================================
   Engagement Commerce — site.css
   ============================================================ */

:root {
    --ink: #0e0d0b;
    --parchment: #f5f2ec;
    --warm-white: #faf9f6;
    --accent: #b5431a;
    --accent-light: #e8c5b4;
    --muted: #8a8479;
    --rule: #d9d4ca;
    --serif: 'Cormorant Garamond', Georgia, serif;
    --mono: 'DM Mono', monospace;
    --sans: 'Instrument Sans', sans-serif;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--warm-white);
    color: var(--ink);
    font-family: var(--serif);
    font-size: 18px;
    line-height: 1.7;
    overflow-x: hidden;
}

/* Grain texture overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1000;
    opacity: 0.4;
}

/* ---- Container ---- */
.container {
    max-width: 1100px;
    margin: 0 auto;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(250, 249, 246, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
}

.nav.scrolled {
    border-bottom-color: var(--rule);
}

.nav-logo {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink);
    text-decoration: none;
    font-weight: 300;
}

.nav-logo span {
    color: var(--accent);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.nav-hamburger span {
    display: block;
    width: 24px;
    height: 1px;
    background: var(--ink);
    transition: transform 0.3s, opacity 0.3s;
}

.nav-hamburger.open span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
    opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.nav-links {
    display: flex;
    gap: 36px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--ink);
}

.nav-links .cta-nav {
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 7px 18px;
    border-radius: 2px;
    transition: background 0.2s, color 0.2s;
}

.nav-links .cta-nav:hover {
    background: var(--accent);
    color: var(--warm-white);
}

/* ---- Hero ---- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 140px 48px 80px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 80% 30%, rgba(181, 67, 26, 0.06) 0%, transparent 70%), radial-gradient(ellipse 40% 60% at 15% 70%, rgba(181, 67, 26, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 100px;
    right: 48px;
    width: 1px;
    height: 180px;
    background: linear-gradient(to bottom, var(--rule), transparent);
}

.hero-eyebrow {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 28px;
    opacity: 0;
    animation: fadeUp 0.8s ease forwards 0.2s;
}

.hero-headline {
    font-size: clamp(52px, 7vw, 108px);
    font-weight: 300;
    line-height: 1.0;
    letter-spacing: -0.02em;
    max-width: 900px;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeUp 0.9s ease forwards 0.4s;
}

.hero-headline em {
    font-style: italic;
    color: var(--accent);
}

.hero-divider {
    width: 48px;
    height: 1px;
    background: var(--accent);
    margin-bottom: 32px;
    opacity: 0;
    animation: fadeUp 0.9s ease forwards 0.6s;
}

.hero-sub {
    font-size: clamp(16px, 1.8vw, 21px);
    font-weight: 300;
    max-width: 620px;
    color: #4a4640;
    line-height: 1.65;
    margin-bottom: 20px;
    opacity: 0;
    animation: fadeUp 0.9s ease forwards 0.7s;
}

.hero-body {
    font-size: 15px;
    font-family: var(--sans);
    font-weight: 400;
    max-width: 560px;
    color: var(--muted);
    line-height: 1.75;
    margin-bottom: 52px;
    opacity: 0;
    animation: fadeUp 0.9s ease forwards 0.85s;
}

.hero-actions {
    display: flex;
    gap: 20px;
    align-items: center;
    opacity: 0;
    animation: fadeUp 0.9s ease forwards 1.0s;
}

/* ---- Shared Sections ---- */
section {
    padding: 100px 48px;
    position: relative;
}

.section-rule {
    width: 100%;
    height: 1px;
    background: var(--rule);
    margin-bottom: 80px;
}

.section-rule--light {
    background: rgba(255, 255, 255, 0.1);
}

.section-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 48px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.section-label::before {
    content: '';
    display: block;
    width: 24px;
    height: 1px;
    background: var(--muted);
}

.section-label--light {
    color: rgba(255, 255, 255, 0.4);
}

.section-label--light::before {
    background: rgba(255, 255, 255, 0.3);
}

.section-title {
    font-size: clamp(30px, 4vw, 52px);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.015em;
    margin-bottom: 48px;
    max-width: 700px;
}

.section-title--light {
    color: var(--warm-white);
}

.def-body {
    font-size: 17px;
    font-family: var(--sans);
    font-weight: 400;
    color: #4a4640;
    line-height: 1.8;
    margin-bottom: 24px;
    max-width: 680px;
}

.def-body--small {
    font-size: 15px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--rule);
}

/* ---- Definition Section ---- */
.section-definition {
    background: var(--parchment);
}

.definition-block {
    border-left: 2px solid var(--accent);
    padding: 40px 0 40px 56px;
    margin: 56px 0;
    max-width: 800px;
}

.definition-block p {
    font-size: clamp(22px, 3vw, 38px);
    font-weight: 300;
    line-height: 1.35;
    letter-spacing: -0.01em;
    color: var(--ink);
}

.system-line {
    font-size: clamp(16px, 2vw, 22px);
    font-style: italic;
    font-weight: 300;
    color: var(--ink);
    max-width: 680px;
    line-height: 1.5;
    border-top: 1px solid var(--rule);
    padding-top: 32px;
    margin-top: 16px;
}

/* ---- Inevitability Section ---- */
.section-inevitability {
    background: var(--warm-white);
}

.market-statements {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1px;
    background: var(--rule);
    margin: 56px 0;
    border: 1px solid var(--rule);
}

.market-cell {
    background: var(--warm-white);
    padding: 40px 36px;
}

.cell-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 16px;
}

.market-cell p {
    font-size: 20px;
    font-weight: 300;
    line-height: 1.4;
    color: var(--ink);
}

.market-cell--accent {
    background: var(--ink);
}

.market-cell--accent .cell-label {
    color: var(--accent-light);
}

.market-cell--accent p {
    color: var(--warm-white);
}

.inevitability-close {
    font-size: clamp(20px, 2.5vw, 30px);
    font-weight: 300;
    line-height: 1.4;
    max-width: 640px;
    font-style: italic;
}

.inevitability-close strong {
    font-style: normal;
    font-weight: 600;
}

/* ---- Old Models Section ---- */
.section-before {
    background: var(--parchment);
}

.fragments-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 56px 0;
}

.fragment-card {
    padding: 32px 28px;
    border: 1px solid var(--rule);
    background: var(--warm-white);
    position: relative;
    overflow: hidden;
}

.fragment-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--rule);
    transition: background 0.3s;
}

.fragment-card:hover::before {
    background: var(--accent);
}

.fragment-num {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.fragment-card p {
    font-size: 16px;
    font-family: var(--sans);
    color: #4a4640;
    line-height: 1.65;
}

.transition-block {
    margin-top: 60px;
    padding: 48px 0;
    border-top: 1px solid var(--rule);
    max-width: 640px;
}

.transition-block p {
    font-size: clamp(20px, 2.5vw, 32px);
    font-weight: 300;
    line-height: 1.35;
    color: var(--ink);
}

.transition-block p + p {
    margin-top: 12px;
    color: var(--accent);
    font-style: italic;
}

/* ---- Enables Section ---- */
.section-enables {
    background: var(--ink);
}

.enables-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin: 56px 0;
}

.enable-item {
    background: var(--ink);
    padding: 36px 40px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
    transition: background 0.2s;
}

.enable-item:hover {
    background: #1a1916;
}

.enable-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    margin-top: 8px;
    flex-shrink: 0;
}

.enable-item p {
    font-size: 17px;
    font-weight: 300;
    color: rgba(250, 249, 246, 0.85);
    line-height: 1.5;
}

.enables-close {
    font-size: clamp(18px, 2.2vw, 26px);
    font-weight: 300;
    color: var(--warm-white);
    line-height: 1.5;
    max-width: 600px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.enables-close em {
    color: var(--accent);
    font-style: italic;
}

/* ---- Positioning Section ---- */
.section-positioning {
    background: var(--warm-white);
}

.positioning-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.positioning-right {
    padding-top: 72px;
}

.proof-tag {
    display: inline-block;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted);
    border: 1px solid var(--rule);
    padding: 8px 16px;
    margin-bottom: 32px;
}

.flag-line {
    font-size: clamp(18px, 2vw, 24px);
    font-weight: 400;
    line-height: 1.45;
    color: var(--ink);
    border-left: 2px solid var(--accent);
    padding-left: 24px;
    margin-top: 40px;
}

/* ---- Closing Banner ---- */
.section-closing {
    background: var(--parchment);
    padding: 120px 48px;
    text-align: center;
}

.closing-inner {
    max-width: 800px;
    margin: 0 auto;
}

.closing-accent {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--rule), transparent);
    margin: 0 auto 48px;
}

.closing-lines {
    margin-bottom: 60px;
}

.closing-lines p {
    font-size: clamp(24px, 3.5vw, 52px);
    font-weight: 300;
    line-height: 1.2;
    color: var(--ink);
    letter-spacing: -0.015em;
}

.closing-lines p:nth-child(2) {
    color: var(--muted);
}

.closing-highlight {
    color: var(--accent) !important;
    font-style: italic;
    margin-top: 8px;
}

/* ---- Footer CTA ---- */
.section-footer-cta {
    background: var(--ink);
    padding: 80px 48px;
}

.footer-cta-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.section-footer-cta h3 {
    font-size: clamp(22px, 2.5vw, 36px);
    font-weight: 300;
    color: var(--warm-white);
    line-height: 1.3;
    max-width: 480px;
}

.section-footer-cta h3 em {
    color: var(--accent-light);
    font-style: italic;
}

.footer-actions {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-shrink: 0;
}

/* ---- Site Footer ---- */
.site-footer {
    background: var(--ink);
    padding: 32px 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 300;
}

.footer-logo span {
    color: var(--accent);
}

.footer-tagline {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.3);
    margin-top: 4px;
}

.footer-links {
    display: flex;
    gap: 28px;
}

.footer-links a {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: rgba(255, 255, 255, 0.6);
}

.footer-copy {
    font-family: var(--mono);
    font-size: 11px;
    color: rgba(255, 255, 255, 0.3);
    letter-spacing: 0.08em;
}

/* ---- Buttons ---- */
.btn-primary {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: var(--ink);
    color: var(--warm-white);
    padding: 14px 32px;
    text-decoration: none;
    border-radius: 2px;
    transition: background 0.2s, transform 0.15s;
    display: inline-block;
}

.btn-primary:hover {
    background: #2a2820;
    transform: translateY(-1px);
}

.btn-ghost {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    padding: 14px 0;
    border-bottom: 1px solid var(--rule);
    transition: color 0.2s, border-color 0.2s;
    display: inline-block;
}

.btn-ghost:hover {
    color: var(--ink);
    border-color: var(--ink);
}

.btn-white {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    background: var(--warm-white);
    color: var(--ink);
    padding: 14px 32px;
    text-decoration: none;
    border-radius: 2px;
    transition: opacity 0.2s;
    display: inline-block;
}

.btn-white:hover {
    opacity: 0.88;
}

.btn-outline-white {
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    transition: color 0.2s, border-color 0.2s;
    display: inline-block;
}

.btn-outline-white:hover {
    color: var(--warm-white);
    border-bottom-color: rgba(255, 255, 255, 0.6);
}

/* ---- Scroll Reveal ---- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

/* ---- Animations ---- */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .nav {
        padding: 18px 24px;
    }

    .nav-hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--warm-white);
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--rule);
        gap: 20px;
        align-items: flex-start;
    }

    .nav-links.open {
        display: flex;
    }

    section {
        padding: 72px 24px;
    }

    .hero {
        padding: 120px 24px 72px;
    }

    .market-statements {
        grid-template-columns: 1fr;
    }

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

    .enables-list {
        grid-template-columns: 1fr;
    }

    .positioning-inner {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .positioning-right {
        padding-top: 0;
    }

    .footer-cta-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 600px) {
    .fragments-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-closing {
        padding: 80px 24px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 16px;
    }
}