/* =======================================
   AmbTrack — v3
   Editorial light design
   Instrument Serif + DM Sans + JetBrains Mono
   ======================================= */

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

:root {
    --red: #DC2626;
    --red-hover: #B91C1C;
    --red-bg: #FEF2F2;
    --amber: #D97706;
    --amber-bg: #FFFBEB;
    --blue: #2563EB;
    --blue-bg: #EFF6FF;
    --purple: #7C3AED;
    --purple-bg: #F5F3FF;
    --green: #059669;
    --green-bg: #ECFDF5;

    --slate-950: #020617;
    --slate-900: #0F172A;
    --slate-800: #1E293B;
    --slate-700: #334155;
    --slate-600: #475569;
    --slate-500: #64748B;
    --slate-400: #94A3B8;
    --slate-300: #CBD5E1;
    --slate-200: #E2E8F0;
    --slate-100: #F1F5F9;
    --slate-50: #F8FAFC;
    --white: #FFFFFF;

    --sans: 'DM Sans', system-ui, sans-serif;
    --serif: 'Instrument Serif', Georgia, serif;
    --mono: 'JetBrains Mono', monospace;

    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 20px;
}

html { scroll-behavior: smooth; }
body { font-family: var(--sans); color: var(--slate-700); background: var(--white); line-height: 1.65; -webkit-font-smoothing: antialiased; }
::selection { background: var(--red); color: var(--white); }

img { max-width: 100%; display: block; }
a { color: inherit; }

/* Layout */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 720px; }

/* ---- Typography ---- */
h1, h2, h3 { color: var(--slate-900); }
em { font-family: var(--serif); font-style: italic; font-weight: 400; }

/* ---- Buttons ---- */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--sans); font-weight: 600; font-size: 15px;
    padding: 11px 22px; border-radius: var(--r-sm); border: none;
    cursor: pointer; text-decoration: none;
    background: var(--slate-900); color: var(--white);
    transition: all .2s;
}
.btn:hover { background: var(--slate-800); transform: translateY(-1px); }
.btn-sm { font-size: 13px; padding: 8px 16px; }
.btn-lg { font-size: 16px; padding: 14px 28px; }
.btn-white { background: var(--white); color: var(--slate-900); }
.btn-white:hover { background: var(--slate-100); }
.btn-white-ghost { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,.35); }
.btn-white-ghost:hover { border-color: var(--white); background: rgba(255,255,255,.08); }

/* =========================================
   NAV
   ========================================= */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(255,255,255,.9); backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid transparent;
    transition: border-color .3s, box-shadow .3s;
}
.nav.scrolled { border-bottom-color: var(--slate-200); box-shadow: 0 1px 3px rgba(0,0,0,.04); }

.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--sans); font-weight: 700; font-size: 18px; color: var(--slate-900); letter-spacing: -.02em; }
.nav-logo-mark { width: 32px; height: 32px; background: var(--red); color: var(--white); border-radius: 8px; display: flex; align-items: center; justify-content: center; }

.nav-links { display: flex; gap: 28px; }
.nav-links a { text-decoration: none; font-size: 14px; font-weight: 500; color: var(--slate-500); transition: color .15s; }
.nav-links a:hover { color: var(--slate-900); }

.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-link-cta { text-decoration: none; font-size: 14px; font-weight: 500; color: var(--slate-500); transition: color .15s; }
.nav-link-cta:hover { color: var(--slate-900); }

.nav-burger { display: none; background: none; border: none; cursor: pointer; width: 28px; height: 20px; position: relative; padding: 0; }
.nav-burger span { display: block; height: 2px; background: var(--slate-700); border-radius: 2px; position: absolute; left: 0; right: 0; transition: all .25s; }
.nav-burger span:first-child { top: 0; }
.nav-burger span:last-child { bottom: 0; }
.nav-burger.open span:first-child { top: 50%; transform: translateY(-50%) rotate(45deg); }
.nav-burger.open span:last-child { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

.nav-mobile { display: none; padding: 8px 24px 24px; border-top: 1px solid var(--slate-100); }
.nav-mobile.open { display: flex; flex-direction: column; gap: 0; }
.nav-mobile a { text-decoration: none; font-size: 15px; font-weight: 500; color: var(--slate-600); padding: 12px 0; border-bottom: 1px solid var(--slate-100); }
.nav-mobile .btn { text-align: center; justify-content: center; color: var(--white); }

@media (max-width: 768px) {
    .nav-links, .nav-right { display: none; }
    .nav-burger { display: block; }
}


/* =========================================
   HERO
   ========================================= */
.hero {
    padding: 160px 0 0;
    position: relative;
}

.hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 600; color: var(--slate-500);
    margin-bottom: 32px; letter-spacing: .02em;
}
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px rgba(5,150,105,.2); animation: blink 2.5s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.4} }

.hero-h1 {
    font-family: var(--sans); font-weight: 600; font-size: clamp(32px, 5vw, 54px);
    line-height: 1.2; letter-spacing: -.03em;
    color: var(--slate-900); margin-bottom: 24px;
    max-width: 720px;
}
.hero-h1 em { font-family: var(--serif); font-weight: 400; color: var(--red); }
.hero-muted { color: var(--slate-400); }

.hero-p {
    font-size: 17px; color: var(--slate-500); max-width: 540px;
    margin-bottom: 36px; line-height: 1.7;
}

.hero-actions { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; margin-bottom: 0; }
.hero-scroll-link { text-decoration: none; font-size: 14px; font-weight: 500; color: var(--slate-400); transition: color .15s; }
.hero-scroll-link:hover { color: var(--red); }

/* Proof strip */
.hero-proof { margin-top: 80px; border-top: 1px solid var(--slate-200); background: var(--slate-50); }
.proof-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.proof-item { padding: 28px 0; text-align: center; }
.proof-num { display: block; font-family: var(--mono); font-size: 22px; font-weight: 500; color: var(--slate-900); letter-spacing: -.02em; }
.proof-label { font-size: 13px; color: var(--slate-400); margin-top: 2px; }

@media (max-width: 600px) {
    .hero { padding-top: 120px; }
    .proof-grid { grid-template-columns: repeat(2, 1fr); }
    .proof-item { padding: 20px 0; }
}


/* =========================================
   SECTIONS — shared
   ========================================= */
.section { padding: 96px 0; }
.section-alt { background: var(--slate-50); }

.section-label {
    font-family: var(--mono); font-size: 12px; font-weight: 500;
    text-transform: uppercase; letter-spacing: .1em;
    color: var(--red); margin-bottom: 12px;
}
.section-h2 {
    font-family: var(--sans); font-weight: 600;
    font-size: clamp(26px, 3.5vw, 40px); line-height: 1.2;
    letter-spacing: -.025em; margin-bottom: 16px;
    text-align: center;
}
.section-h2 em { font-family: var(--serif); }
.align-left { text-align: left !important; }

.section-sub { font-size: 16px; color: var(--slate-500); text-align: center; margin-bottom: 48px; }
.section-label { text-align: center; }


/* =========================================
   PROCESS (How it works)
   ========================================= */
.process { max-width: 640px; margin: 48px auto 0; display: flex; flex-direction: column; gap: 0; }

.process-step {
    display: flex; gap: 20px; align-items: flex-start;
    padding: 28px 0;
    border-bottom: 1px solid var(--slate-200);
}
.process-step:last-child { border-bottom: none; }

.process-num {
    font-family: var(--serif); font-size: 44px; font-style: italic;
    color: var(--slate-200); line-height: 1; flex-shrink: 0; width: 56px;
    transition: color .3s;
}
.process-step:hover .process-num { color: var(--red); }

.process-body h3 { font-family: var(--sans); font-size: 17px; font-weight: 600; color: var(--slate-900); margin-bottom: 4px; }
.process-body p { font-size: 15px; color: var(--slate-500); }


/* =========================================
   BENTO (Features)
   ========================================= */
.bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 48px;
}

.bento-card {
    background: var(--white); border: 1px solid var(--slate-200);
    border-radius: var(--r-lg); padding: 28px;
    transition: transform .25s, box-shadow .25s;
    position: relative; overflow: hidden;
}
.bento-card:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,.06); }

.bento-icon {
    width: 44px; height: 44px; border-radius: var(--r-sm);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 16px;
}
.bento-icon.red { background: var(--red-bg); color: var(--red); }
.bento-icon.amber { background: var(--amber-bg); color: var(--amber); }
.bento-icon.blue { background: var(--blue-bg); color: var(--blue); }
.bento-icon.purple { background: var(--purple-bg); color: var(--purple); }
.bento-icon.green { background: var(--green-bg); color: var(--green); }

.bento-card h3 { font-size: 17px; font-weight: 600; color: var(--slate-900); margin-bottom: 6px; }
.bento-card p { font-size: 14px; color: var(--slate-500); line-height: 1.6; }

.bento-tag {
    display: inline-block; margin-top: 12px;
    font-family: var(--mono); font-size: 11px; font-weight: 500;
    color: var(--slate-500); background: var(--slate-100);
    padding: 3px 10px; border-radius: 100px;
}

@media (max-width: 768px) {
    .bento { grid-template-columns: 1fr; }
}


/* =========================================
   DASHBOARDS / ROLES
   ========================================= */
.role-tabs {
    display: flex; gap: 0; border: 1px solid var(--slate-200);
    border-radius: var(--r-md); overflow: hidden;
    margin-bottom: 48px;
}
.role-tab {
    flex: 1; padding: 14px 16px; font-family: var(--sans); font-size: 14px; font-weight: 500;
    color: var(--slate-500); background: var(--white); border: none; cursor: pointer;
    border-right: 1px solid var(--slate-200); text-align: left;
    display: flex; align-items: center; gap: 10px;
    transition: all .2s;
}
.role-tab:last-child { border-right: none; }
.role-tab:hover { background: var(--slate-50); color: var(--slate-800); }
.role-tab.active { background: var(--slate-900); color: var(--white); }
.role-tab-num { font-family: var(--mono); font-size: 11px; opacity: .5; }

.role-panel { display: none; }
.role-panel.active { display: block; animation: fadeUp .35s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.role-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.role-info h3 { font-size: 26px; font-weight: 600; color: var(--slate-900); margin-bottom: 10px; letter-spacing: -.02em; }
.role-info > p { font-size: 15px; color: var(--slate-500); margin-bottom: 24px; }

.role-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.role-list li { display: flex; gap: 10px; font-size: 14px; color: var(--slate-600); }
.role-list li::before {
    content: ''; flex-shrink: 0; width: 6px; height: 6px; border-radius: 50%;
    background: var(--red); margin-top: 7px;
}

/* Phone & tablet mockup */
.role-mockup { display: flex; justify-content: center; }
.mockup-phone { width: 260px; background: var(--slate-900); border-radius: 28px; padding: 10px; box-shadow: 0 24px 48px rgba(0,0,0,.12); }
.mockup-tablet { width: 340px; background: var(--slate-900); border-radius: 16px; padding: 10px; box-shadow: 0 24px 48px rgba(0,0,0,.12); }
.mockup-screen { background: var(--white); border-radius: 20px; overflow: hidden; }
.mockup-tablet .mockup-screen { border-radius: 10px; }

.mockup-bar { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; }
.mockup-status { font-family: var(--mono); font-size: 10px; font-weight: 500; padding: 3px 8px; border-radius: 100px; letter-spacing: .02em; }
.mockup-status.green { background: #DCFCE7; color: #15803D; }
.mockup-status.amber { background: #FEF3C7; color: #92400E; }
.mockup-status.blue { background: #DBEAFE; color: #1E40AF; }
.mockup-status.purple { background: #EDE9FE; color: #5B21B6; }
.mockup-meta { font-size: 11px; color: var(--slate-400); font-weight: 500; }

.mockup-map { height: 100px; margin: 0 10px; border-radius: var(--r-sm); background: linear-gradient(135deg, #FEE2E2, #FECACA); }

.mockup-info-block { padding: 10px 14px; }
.mockup-info-block small { font-size: 9px; text-transform: uppercase; letter-spacing: .06em; color: var(--slate-400); font-weight: 600; display: block; margin-bottom: 2px; }
.mockup-info-block strong { font-size: 13px; color: var(--slate-900); display: block; }
.mockup-critical { font-size: 11px; color: var(--red); font-weight: 500; }

.mockup-btns { display: flex; gap: 6px; padding: 0 10px 10px; }
.mockup-btn-sos { flex: 0 0 auto; padding: 8px 16px; background: var(--red); color: var(--white); border: none; border-radius: var(--r-sm); font-family: var(--sans); font-size: 12px; font-weight: 700; cursor: pointer; }
.mockup-btn-sec { flex: 1; padding: 8px; background: var(--slate-100); color: var(--slate-600); border: none; border-radius: var(--r-sm); font-family: var(--sans); font-size: 12px; font-weight: 600; cursor: pointer; }

.mockup-stat-row { display: flex; border-bottom: 1px solid var(--slate-200); }
.mockup-stat { flex: 1; text-align: center; padding: 10px 6px; border-right: 1px solid var(--slate-200); }
.mockup-stat:last-child { border-right: none; }
.mockup-stat strong { display: block; font-family: var(--mono); font-size: 20px; color: var(--slate-900); }
.mockup-stat span { font-size: 10px; color: var(--slate-400); }

@media (max-width: 768px) {
    .role-tabs { flex-direction: column; }
    .role-tab { border-right: none; border-bottom: 1px solid var(--slate-200); }
    .role-tab:last-child { border-bottom: none; }
    .role-grid { grid-template-columns: 1fr; gap: 36px; }
}


/* =========================================
   INFRASTRUCTURE
   ========================================= */
.infra-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; margin-bottom: 40px; }
.infra-p { font-size: 15px; color: var(--slate-500); margin-top: 16px; line-height: 1.65; max-width: 420px; }

.infra-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.metric-card {
    background: var(--white); border: 1px solid var(--slate-200);
    border-radius: var(--r-md); padding: 24px; text-align: center;
}
.metric-val { font-family: var(--mono); font-size: 28px; font-weight: 500; color: var(--slate-900); letter-spacing: -.03em; }
.metric-val span { font-size: 16px; color: var(--slate-400); }
.metric-name { font-size: 12px; color: var(--slate-400); margin-top: 4px; }

.stack-strip {
    display: flex; align-items: center; justify-content: center; gap: 0; flex-wrap: wrap;
    border: 1px solid var(--slate-200); border-radius: var(--r-md); overflow: hidden;
}
.stack-item {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
    padding: 14px 20px;
    border-right: 1px solid var(--slate-200);
    transition: background .15s;
    color: var(--slate-400);
}
.stack-item:last-child { border-right: none; }
.stack-item:hover { background: var(--slate-100); color: var(--slate-600); }
.stack-item svg { flex-shrink: 0; }
.stack-label { font-family: var(--mono); font-size: 12px; font-weight: 500; }

@media (max-width: 768px) {
    .infra-layout { grid-template-columns: 1fr; }
    .align-left { text-align: center !important; }
    .infra-p { max-width: none; }
    .stack-strip { flex-wrap: wrap; }
    .stack-item { flex: 0 0 33.33%; border-bottom: 1px solid var(--slate-200); }
    .stack-item:nth-child(3n) { border-right: none; }
    .stack-item:nth-last-child(-n+3) { border-bottom: none; }
}


/* =========================================
   FAQ — native <details>
   ========================================= */
.faq-list { display: flex; flex-direction: column; gap: 0; margin-top: 40px; }

.faq-item {
    border-bottom: 1px solid var(--slate-200);
}
.faq-item:first-child { border-top: 1px solid var(--slate-200); }

.faq-item summary {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 0; cursor: pointer; font-size: 16px; font-weight: 500;
    color: var(--slate-800); list-style: none;
    transition: color .15s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+'; font-size: 20px; color: var(--slate-400);
    transition: transform .25s;
    flex-shrink: 0; margin-left: 16px;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item[open] summary { color: var(--slate-900); }

.faq-item p { padding: 0 0 20px; font-size: 15px; color: var(--slate-500); line-height: 1.7; }


/* =========================================
   CTA
   ========================================= */
.cta { padding: 80px 0 96px; }
.cta-inner {
    background: var(--slate-900); border-radius: var(--r-lg); padding: 72px 48px;
    text-align: center; position: relative; overflow: hidden;
}
.cta-inner::before {
    content: ''; position: absolute; width: 500px; height: 500px;
    border-radius: 50%; background: rgba(220,38,38,.08);
    top: -200px; right: -100px;
}
.cta-inner h2 { font-size: clamp(26px, 3.5vw, 38px); color: var(--white); margin-bottom: 12px; position: relative; letter-spacing: -.02em; }
.cta-inner h2 em { font-family: var(--serif); color: var(--red); }
.cta-inner p { font-size: 16px; color: var(--slate-400); margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto; position: relative; }
.cta-note { display: block; margin-top: 16px; font-size: 13px; color: var(--slate-500); position: relative; }
.cta-or { font-size: 13px; color: var(--slate-500); margin: 16px 0; position: relative; }

/* Demo form */
.demo-form { position: relative; max-width: 480px; margin: 0 auto; }
.demo-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.demo-input {
    font-family: var(--sans); font-size: 14px; padding: 12px 16px;
    border: 1px solid rgba(255,255,255,.15); border-radius: var(--r-sm);
    background: rgba(255,255,255,.06); color: var(--white);
    outline: none; transition: border-color .2s;
    width: 100%;
}
.demo-input::placeholder { color: var(--slate-500); }
.demo-input:focus { border-color: rgba(255,255,255,.4); }
.demo-select { appearance: none; cursor: pointer; }
.demo-select option { background: var(--slate-900); color: var(--white); }
.demo-input.invalid { border-color: var(--red); }
.demo-error {
    font-size: 13px; color: var(--red); margin-bottom: 12px;
    display: none; text-align: left;
}
.demo-error.visible { display: block; }
.demo-submit { width: 100%; justify-content: center; }
.demo-success {
    display: none; flex-direction: column; align-items: center; gap: 8px;
    color: var(--green); position: relative; padding: 20px 0;
}
.demo-success.visible { display: flex; }
.demo-success strong { font-size: 18px; color: var(--white); }
.demo-success span { font-size: 14px; color: var(--slate-400); }

@media (max-width: 600px) {
    .demo-fields { grid-template-columns: 1fr; }
    .cta-inner { padding: 48px 24px; }
}


/* =========================================
   FOOTER
   ========================================= */
.footer { background: var(--slate-950); padding: 56px 0 28px; }

.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 14px; color: var(--slate-400); margin-top: 10px; }

.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col strong { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--slate-300); margin-bottom: 4px; }
.footer-col a { text-decoration: none; font-size: 14px; color: var(--slate-400); transition: color .15s; }
.footer-col a:hover { color: var(--white); }

.footer-bottom {
    display: flex; justify-content: center;
    padding-top: 28px; border-top: 1px solid rgba(255,255,255,.1);
    font-size: 13px; color: var(--slate-400);
}

@media (max-width: 768px) {
    .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 4px; }
}


/* =========================================
   SCROLL REVEAL
   ========================================= */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.vis { opacity: 1; transform: translateY(0); }