/* =========================================================
   Titan Stripe Technology — site styles
   ========================================================= */

:root {
  --ink: #0A0E1A;
  --ink-2: #121829;
  --ink-3: #1B2236;
  --paper: #FFFFFF;
  --tint: #F5F4EF;
  --text: #171C2B;
  --muted: #5A6174;
  --muted-dark: #A3AABD;
  --line: #E4E2DA;
  --line-dark: rgba(255, 255, 255, .1);
  --accent: #16A34A;
  --accent-600: #15803D;
  --accent-soft: #DCFCE7;
  --cool: #7AA2FF;
  --glow: #4ADE80;

  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(10, 14, 26, .04), 0 8px 24px rgba(10, 14, 26, .06);
  --shadow-lg: 0 24px 60px rgba(10, 14, 26, .18);
  --header-h: 72px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 8px); -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.12; margin: 0 0 .5em; letter-spacing: -.02em; }
h1 { font-size: clamp(2.4rem, 5vw, 3.9rem); font-weight: 700; }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.9rem); font-weight: 700; }
h3 { font-size: 1.18rem; font-weight: 600; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 max(24px, env(safe-area-inset-left)) 0 max(24px, env(safe-area-inset-right)); }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 100;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 8px; text-decoration: none;
}
.skip-link:focus { top: 12px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55em;
  font: 600 15px/1 var(--font-body);
  padding: 15px 24px; border-radius: 999px; border: 1.5px solid transparent;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background .2s, color .2s, border-color .2s, transform .2s, box-shadow .2s;
}
.btn svg { width: 18px; height: 18px; transition: transform .2s; }
.btn:hover svg { transform: translateX(3px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 24px rgba(22, 163, 74, .28); }
.btn-primary:hover { background: var(--accent-600); transform: translateY(-1px); }
.btn-ghost { color: #fff; border-color: rgba(255, 255, 255, .28); }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .06); }
.btn-sm { padding: 11px 18px; font-size: 14px; box-shadow: none; }
.btn-block { width: 100%; }

.text-link { color: var(--accent-600); font-weight: 600; text-underline-offset: 3px; }

/* ---------- Eyebrows ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 600 13px/1 var(--font-body); letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent-600); margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; }
.eyebrow-dark { color: var(--glow); }
.eyebrow .dot { display: none; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 50; height: var(--header-h);
  background: rgba(10, 14, 26, .0);
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.site-header.scrolled {
  background: rgba(10, 14, 26, .86);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  box-shadow: 0 1px 0 var(--line-dark);
}
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: #fff; }
.brand-mark { width: 40px; height: 40px; flex: none; }
.brand-text { font: 700 18px/1.05 var(--font-head); letter-spacing: -.01em; display: flex; flex-direction: column; }
.brand-text span { font: 500 11px/1.2 var(--font-body); letter-spacing: .2em; text-transform: uppercase; color: var(--muted-dark); margin-top: 3px; }

.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav ul { display: flex; gap: 4px; }
.main-nav ul a {
  display: block; padding: 8px 12px; border-radius: 8px;
  color: rgba(255, 255, 255, .78); text-decoration: none; font-size: 15px; font-weight: 500;
  transition: color .2s, background .2s;
}
.main-nav ul a:hover, .main-nav ul a.active { color: #fff; background: rgba(255, 255, 255, .07); }

.nav-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; padding: 10px; border-radius: 10px; }
.nav-toggle span { display: block; height: 2px; background: #fff; border-radius: 2px; margin: 5px 0; transition: transform .25s, opacity .25s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff; background: var(--ink);
  padding: calc(var(--header-h) + 72px) 0 96px;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(60% 55% at 85% 20%, rgba(74, 222, 128, .2), transparent 70%),
    radial-gradient(45% 50% at 10% 90%, rgba(122, 162, 255, .14), transparent 70%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, .035) 0 2px, transparent 2px 34px);
  -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent);
          mask-image: linear-gradient(to bottom, #000 70%, transparent);
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: center; }
.hero h1 { margin-bottom: 24px; }
.accent-text {
  background: linear-gradient(92deg, #D9F99D, #4ADE80 55%, #2DD4BF);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: 1.15rem; color: rgba(255, 255, 255, .86); max-width: 38em; }
.hero-sub { color: var(--muted-dark); max-width: 36em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 32px 0 44px; }

.hero-facts { display: flex; flex-wrap: wrap; gap: 0; border-top: 1px solid var(--line-dark); padding-top: 24px; }
.hero-facts li { flex: 1 1 0; min-width: 140px; padding-right: 20px; }
.hero-facts li + li { padding-left: 20px; border-left: 1px solid var(--line-dark); }
.hero-facts strong { display: block; font: 700 1.6rem/1.1 var(--font-head); color: #fff; }
.hero-facts span { font-size: 14px; color: var(--muted-dark); }

/* hero visual */
.hero-visual { position: relative; min-height: 470px; }
.win {
  position: absolute; border-radius: var(--radius); border: 1px solid rgba(255, 255, 255, .1);
  box-shadow: var(--shadow-lg);
}
.win-code {
  top: 0; left: 0; width: 82%;
  background: linear-gradient(180deg, #151C30, #10162A);
  animation: float 9s ease-in-out infinite;
}
.win-bar { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid rgba(255, 255, 255, .07); }
.win-bar i { width: 10px; height: 10px; border-radius: 50%; background: #2C3550; }
.win-bar i:first-child { background: #4ADE80; }
.win-bar span { margin-left: 10px; font-size: 12px; color: var(--muted-dark); font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.win-code pre { margin: 0; padding: 18px 20px 22px; font: 13px/1.7 ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: #C9D1E6; overflow: hidden; }
.c-k { color: #A3E635; } .c-f { color: #8FB2FF; } .c-s { color: #9FE3B4; } .c-n { color: #F7C873; } .c-c { color: #5F6A88; font-style: italic; }

.win-chat {
  right: 0; bottom: 0; width: 72%; padding: 18px;
  background: #fff; color: var(--text); border-color: transparent;
  animation: float 9s ease-in-out -4.5s infinite;
}
.chat-head { display: flex; align-items: center; gap: 12px; padding-bottom: 14px; margin-bottom: 14px; border-bottom: 1px solid var(--line); }
.chat-head strong { display: block; font-size: 14px; line-height: 1.2; }
.chat-head small { font-size: 12px; color: #1F9D55; }
.chat-avatar {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: var(--ink); color: var(--glow); font: 700 13px var(--font-head);
}
.bubble { font-size: 13.5px; line-height: 1.55; padding: 10px 14px; border-radius: 14px; margin-bottom: 10px; max-width: 92%; }
.bubble-user { margin-left: auto; background: var(--ink); color: #fff; border-bottom-right-radius: 4px; width: fit-content; }
.bubble-ai { background: var(--tint); border-bottom-left-radius: 4px; }
.cites { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.cites span { font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 6px; background: var(--accent-soft); color: var(--accent-600); }
.chat-input { display: flex; justify-content: space-between; align-items: center; margin-top: 6px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 13px; color: #9AA0AF; }
.chat-input b { color: var(--accent-600); }

.chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 500; white-space: nowrap;
  background: rgba(27, 34, 54, .9); border: 1px solid rgba(255, 255, 255, .12);
  backdrop-filter: blur(8px); box-shadow: 0 10px 30px rgba(0, 0, 0, .3);
}
.chip-a { top: 46%; left: -6%; animation: float 7s ease-in-out -2s infinite; }
.chip-b { top: -4%; right: 2%; animation: float 8s ease-in-out -1s infinite; }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: #35D07F; box-shadow: 0 0 0 0 rgba(53, 208, 127, .6); animation: pulse 2s infinite; }

@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes pulse { 70% { box-shadow: 0 0 0 8px rgba(53, 208, 127, 0); } 100% { box-shadow: 0 0 0 0 rgba(53, 208, 127, 0); } }

/* ---------- Marquee strip ---------- */
.strip { background: var(--ink-2); border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); overflow: hidden; }
.marquee { display: flex; width: max-content; animation: marquee 40s linear infinite; }
.marquee-track { display: flex; flex: none; }
.marquee-track li {
  display: flex; align-items: center; gap: 28px; padding: 20px 14px 20px 14px;
  font: 500 15px var(--font-head); color: var(--muted-dark); white-space: nowrap; letter-spacing: .01em;
}
.marquee-track li::after { content: ""; width: 14px; height: 4px; background: var(--glow); transform: skewX(-25deg); opacity: .8; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- Sections ---------- */
.section { position: relative; padding: 112px 0; }
.section-tint { background: var(--tint); }
.section-dark { background: var(--ink); color: #fff; overflow: hidden; }
.section-head { max-width: 760px; margin-bottom: 56px; }
.section-head > p:last-child { color: var(--muted); font-size: 1.08rem; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 72px; align-items: start; }
.lead-dark { font-size: 1.2rem; font-weight: 500; color: var(--text); }
.about-copy p:not(.lead-dark):not(.eyebrow) { color: var(--muted); }
.about-pillars { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pillar {
  padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.pillar:hover { border-color: transparent; transform: translateY(-3px); box-shadow: var(--shadow); }
.pillar:nth-child(2) { transform: translateY(32px); }
.pillar:nth-child(4) { transform: translateY(32px); }
.pillar:nth-child(2):hover, .pillar:nth-child(4):hover { transform: translateY(29px); }
.pillar-num { display: inline-block; font: 700 13px var(--font-head); color: var(--accent-600); margin-bottom: 14px; padding: 4px 9px; border-radius: 6px; background: var(--accent-soft); }
.pillar p { color: var(--muted); font-size: 15px; margin: 0; }

/* Services */
.service-tabs { display: inline-flex; flex-wrap: wrap; gap: 6px; padding: 6px; background: #fff; border: 1px solid var(--line); border-radius: 999px; margin-bottom: 32px; }
.service-tabs button {
  font: 500 14px var(--font-body); padding: 11px 18px; white-space: nowrap; border-radius: 999px; border: 0;
  background: transparent; color: var(--muted); cursor: pointer; transition: background .2s, color .2s;
}
.service-tabs button:hover { color: var(--text); }
.service-tabs button[aria-selected="true"] { background: var(--ink); color: #fff; }

.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.service-card {
  position: relative; display: flex; flex-direction: column;
  padding: 28px 24px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  transition: transform .3s, box-shadow .3s, border-color .3s, opacity .3s;
  overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.service-card:hover::before { transform: scaleX(1); }
.service-card.is-hidden { display: none; }
.service-card p { color: var(--muted); font-size: 14.5px; flex: 1; }
.svc-icon {
  width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center;
  background: var(--ink); margin-bottom: 22px;
}
.svc-icon svg { width: 24px; height: 24px; fill: none; stroke: #fff; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.service-card[data-cat="ai"] .svc-icon { background: var(--accent-600); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.tags li { font-size: 12px; font-weight: 500; padding: 4px 10px; border-radius: 999px; background: var(--tint); color: var(--muted); }

/* AI section */
.stripes {
  position: absolute; right: -10%; top: -20%; width: 60%; height: 140%; pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(74, 222, 128, .07) 0 22px, transparent 22px 60px);
  -webkit-mask-image: radial-gradient(closest-side, #000, transparent);
          mask-image: radial-gradient(closest-side, #000, transparent);
}
.ai-grid { position: relative; display: grid; grid-template-columns: .9fr 1.1fr; gap: 72px; align-items: start; }
.ai-head { position: sticky; top: calc(var(--header-h) + 32px); }
.ai-head > p { color: var(--muted-dark); font-size: 1.08rem; }
.principles { margin-top: 36px; padding: 26px; border-radius: var(--radius); background: var(--ink-3); border: 1px solid var(--line-dark); }
.principles h3 { font-size: 1rem; margin-bottom: 14px; }
.principles li { position: relative; padding-left: 26px; font-size: 14.5px; color: var(--muted-dark); margin-bottom: 10px; }
.principles li:last-child { margin-bottom: 0; }
.principles li::before { content: ""; position: absolute; left: 0; top: .5em; width: 12px; height: 7px; border-left: 2px solid var(--glow); border-bottom: 2px solid var(--glow); transform: rotate(-45deg); }
.principles b { color: #fff; font-weight: 600; }

.outcomes { display: grid; gap: 14px; }
.outcome {
  display: grid; grid-template-columns: auto 1fr; gap: 22px; align-items: start;
  padding: 28px; border-radius: var(--radius); border: 1px solid var(--line-dark);
  background: linear-gradient(180deg, rgba(255, 255, 255, .04), rgba(255, 255, 255, .015));
  transition: border-color .3s, background .3s, transform .3s;
}
.outcome:hover { border-color: rgba(74, 222, 128, .5); background: rgba(74, 222, 128, .06); transform: translateX(4px); }
.o-num { font: 700 1.5rem/1 var(--font-head); color: var(--glow); min-width: 2ch; }
.outcome h3 { font-size: 1.15rem; margin-bottom: 6px; }
.outcome p { color: var(--muted-dark); margin-bottom: 10px; }
.o-eg { display: inline-block; font-size: 13px; color: #D6DBE8; padding: 5px 11px; border-radius: 8px; background: rgba(255, 255, 255, .06); }

/* Process */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; counter-reset: s; }
.step-top { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.step-num {
  flex: none; width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center;
  font: 700 1.3rem var(--font-head); background: var(--ink); color: #fff; position: relative;
}
.step:first-child .step-num { background: var(--accent-600); }
.step-line { flex: 1; height: 2px; background: repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 14px); }
.step:last-child .step-line { background: none; }
.step p { color: var(--muted); font-size: 15px; }
.step-out { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px !important; color: var(--text) !important; font-weight: 500; }
.step-out span { display: block; font-size: 11.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--accent-600); margin-bottom: 4px; }

/* Why */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); grid-auto-rows: minmax(200px, auto); gap: 18px; }
.why-card {
  padding: 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line);
  transition: transform .3s, box-shadow .3s;
}
.why-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.why-card p { color: var(--muted); margin: 0; }
.why-card h3 { font-size: 1.25rem; }
.why-feature {
  grid-row: span 2; display: flex; flex-direction: column;
  background: var(--ink); color: #fff; border-color: transparent;
}
.why-feature h3 { font-size: 1.6rem; }
.why-feature p { color: var(--muted-dark); }
.why-art { margin-top: auto; padding-top: 32px; display: flex; align-items: flex-end; gap: 10px; height: 200px; }
.why-art .bar {
  flex: 1; height: var(--h); border-radius: 8px 8px 3px 3px;
  background: linear-gradient(180deg, #2A3352, #1B2236);
  transform-origin: bottom; transform: scaleY(.15); transition: transform 1s cubic-bezier(.2, .8, .2, 1);
}
.why-art .bar-hl { background: linear-gradient(180deg, #D9F99D, #22C55E); }
.why-feature.in .bar { transform: scaleY(1); }
.why-feature.in .bar:nth-child(2) { transition-delay: .08s; }
.why-feature.in .bar:nth-child(3) { transition-delay: .16s; }
.why-feature.in .bar:nth-child(4) { transition-delay: .24s; }
.why-feature.in .bar:nth-child(5) { transition-delay: .32s; }
.why-feature.in .bar:nth-child(6) { transition-delay: .40s; }

/* Engagement */
.engage-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.engage-card { padding: 34px 30px; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; display: flex; flex-direction: column; }
.engage-card > p:not(.engage-tag) { color: var(--muted); }
.engage-tag { font: 600 12px var(--font-body); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-600); margin-bottom: 10px; }
.engage-card h3 { font-size: 1.45rem; }
.engage-hl { background: var(--ink); color: #fff; border-color: transparent; box-shadow: var(--shadow-lg); }
.engage-hl > p:not(.engage-tag) { color: var(--muted-dark); }
.engage-hl .engage-tag { color: var(--glow); }
.check { margin-top: auto; padding-top: 22px; border-top: 1px solid var(--line); display: grid; gap: 10px; }
.engage-hl .check { border-color: var(--line-dark); }
.check li { position: relative; padding-left: 28px; font-size: 14.5px; }
.check li::before {
  content: ""; position: absolute; left: 0; top: .2em; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-6.5' fill='none' stroke='%2315803D' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/12px no-repeat;
}
.engage-hl .check li::before { background-color: rgba(74, 222, 128, .18); }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 72px; align-items: start; }
.faq-grid header p:last-child { color: var(--muted); }
.faq-list details { background: #fff; border: 1px solid var(--line); border-radius: 14px; margin-bottom: 12px; transition: border-color .2s, box-shadow .2s; }
.faq-list details[open] { border-color: transparent; box-shadow: var(--shadow); }
.faq-list summary {
  list-style: none; cursor: pointer; padding: 20px 56px 20px 24px; position: relative;
  font: 600 1.03rem/1.4 var(--font-head);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: ""; position: absolute; right: 22px; top: 50%; width: 22px; height: 22px; margin-top: -11px; border-radius: 50%;
  background: var(--tint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M10 5v10M5 10h10' stroke='%23171C2B' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") center/12px no-repeat;
  transition: transform .25s, background-color .25s;
}
.faq-list details[open] summary::after { transform: rotate(45deg); background-color: var(--accent-soft); }
.faq-list details p { padding: 0 24px 22px; margin: 0; color: var(--muted); }

/* Contact */
.contact { background: var(--ink); color: #fff; overflow: hidden; }
.contact::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(50% 60% at 0% 100%, rgba(74, 222, 128, .2), transparent 70%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, .03) 0 2px, transparent 2px 34px);
}
.contact-grid { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center; }
.contact-copy > p:not(.lead):not(.eyebrow) { color: var(--muted-dark); }
.contact-next { margin-top: 34px; display: grid; gap: 14px; }
.contact-next li { display: flex; align-items: center; gap: 14px; color: #D6DBE8; }
.contact-next span {
  flex: none; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  font: 600 14px var(--font-head); border: 1px solid rgba(255, 255, 255, .2);
}

.contact-form { background: #fff; color: var(--text); padding: 40px; border-radius: 22px; box-shadow: var(--shadow-lg); }
.contact-form h3 { font-size: 1.5rem; margin-bottom: 24px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.field abbr { color: var(--accent-600); text-decoration: none; }
.field input, .field textarea {
  width: 100%; font: 16px/1.5 var(--font-body); color: var(--text);
  padding: 13px 15px; border: 1.5px solid var(--line); border-radius: var(--radius-sm); background: #FBFAF7;
  transition: border-color .2s, box-shadow .2s, background .2s;
}
.field textarea { resize: vertical; min-height: 130px; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); background: #fff; box-shadow: 0 0 0 4px rgba(22, 163, 74, .16); }
.field.invalid input, .field.invalid textarea { border-color: #D93636; }
.err { display: block; min-height: 0; font-size: 13px; color: #C42B2B; margin-top: 5px; }
.err:empty { display: none; }
.form-note { margin: 14px 0 0; font-size: 13px; color: var(--muted); text-align: center; }
.form-success {
  margin-top: 18px; padding: 16px 18px; border-radius: var(--radius-sm);
  background: #E9F8EF; color: #13643A; display: grid; gap: 2px; font-size: 14.5px;
}
.form-success[hidden] { display: none; }

/* Footer */
.site-footer { background: #070A13; color: var(--muted-dark); padding: 72px 0 0; font-size: 15px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 48px; padding-bottom: 56px; }
.footer-brand p { margin-top: 18px; max-width: 30em; }
.footer-col h4 { font: 600 14px var(--font-body); color: #fff; letter-spacing: .04em; margin-bottom: 16px; }
.footer-col li { margin-bottom: 4px; }
.footer-col a:not(.btn) { display: inline-block; padding: 6px 0; text-decoration: none; transition: color .2s; }
.footer-col a:not(.btn):hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 22px 24px; border-top: 1px solid var(--line-dark); font-size: 14px; }
.footer-bottom p { margin: 0; }
.to-top { text-decoration: none; padding: 10px 0; }
.to-top:hover { color: #fff; }

/* ---------- Reveal on scroll (only when JS is active) ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1); }
.js .reveal.in { opacity: 1; transform: none; }
.js .pillar.reveal.in:nth-child(2), .js .pillar.reveal.in:nth-child(4) { transform: translateY(32px); }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 48px; }
  .step:nth-child(2) .step-line { background: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 960px) {
  :root { --header-h: 64px; }
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 16px;
    max-height: calc(100dvh - var(--header-h)); overflow-y: auto; -webkit-overflow-scrolling: touch;
    padding: 16px 24px calc(28px + env(safe-area-inset-bottom)); background: rgba(10, 14, 26, .98);
    border-bottom: 1px solid var(--line-dark);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .25s, transform .25s, visibility .25s;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav ul { flex-direction: column; gap: 2px; }
  .main-nav ul a { padding: 14px 12px; font-size: 17px; border-radius: 10px; }
  .nav-cta { width: 100%; padding: 15px 20px; font-size: 15px; }
  .site-header.menu-open { background: rgba(10, 14, 26, .98); }
  body.nav-open { overflow: hidden; }
  .engage-grid { margin: 0 auto; }

  .hero { padding-top: calc(var(--header-h) + 48px); }
  .hero-grid, .about-grid, .ai-grid, .faq-grid, .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { min-height: 440px; max-width: 560px; width: 100%; margin: 0 auto; }
  .ai-head { position: static; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .why-feature { grid-column: span 2; grid-row: auto; }
  .why-art { height: 140px; }
  .engage-grid { grid-template-columns: 1fr; max-width: 560px; }
  .section { padding: 88px 0; }
}

@media (max-width: 640px) {
  .container { padding-left: max(18px, env(safe-area-inset-left)); padding-right: max(18px, env(safe-area-inset-right)); }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head > p:last-child { font-size: 1rem; }
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.1rem; }
  .eyebrow { margin-bottom: 14px; }

  /* Hero: single column, chat card as the one illustration */
  .hero { padding: calc(var(--header-h) + 40px) 0 56px; }
  .hero-grid { gap: 36px; }
  .lead { font-size: 1.05rem; }
  .hero-sub { font-size: 15px; }
  .hero-actions { margin: 26px 0 32px; gap: 10px; }
  .hero-actions .btn { flex: 1 1 100%; padding: 16px 24px; }
  .hero-facts { padding-top: 20px; }
  .hero-facts li { min-width: 0; padding-right: 8px; }
  .hero-facts li + li { padding-left: 12px; }
  .hero-facts strong { font-size: 1.25rem; }
  .hero-facts span { font-size: 12px; display: block; line-height: 1.35; }
  .hero-visual { min-height: 0; max-width: none; }
  .win-code, .chip-b { display: none; }
  .win-chat { position: static; width: 100%; animation: none; padding: 16px; }
  .chip-a { position: static; display: inline-flex; margin-top: 12px; animation: none; white-space: normal; }
  .marquee-track li { padding: 16px 12px; font-size: 14px; }

  /* About */
  .about-grid { gap: 36px; }
  .about-pillars { grid-template-columns: 1fr; gap: 12px; }
  .pillar { padding: 22px; }
  .pillar:nth-child(2), .pillar:nth-child(4),
  .js .pillar.reveal.in:nth-child(2), .js .pillar.reveal.in:nth-child(4) { transform: none; }

  /* Services: scrollable filter row, compact cards */
  .service-tabs { display: flex; flex-wrap: nowrap; overflow-x: auto; max-width: 100%; scrollbar-width: none; -webkit-overflow-scrolling: touch; margin-bottom: 22px; }
  .service-tabs::-webkit-scrollbar { display: none; }
  .service-tabs button { flex: 0 0 auto; }
  .service-grid { grid-template-columns: 1fr; gap: 12px; }
  .service-card { padding: 22px 20px; }
  .service-card p { font-size: 14px; }
  .svc-icon { width: 42px; height: 42px; margin-bottom: 16px; }

  /* AI value */
  .ai-grid { gap: 36px; }
  .principles { padding: 20px; margin-top: 26px; }
  .outcomes { gap: 10px; }
  .outcome { padding: 20px; gap: 14px; }
  .o-num { font-size: 1.25rem; }

  /* Process */
  .steps { grid-template-columns: 1fr; gap: 32px; }
  .step-line { display: none; }
  .step-top { margin-bottom: 16px; }

  /* Why */
  .why-grid { grid-template-columns: 1fr; gap: 12px; }
  .why-card { padding: 24px; }
  .why-feature { grid-column: auto; }
  .why-feature h3 { font-size: 1.35rem; }
  .why-art { height: 120px; padding-top: 24px; }

  /* Engagement */
  .engage-grid { gap: 12px; max-width: none; }
  .engage-card { padding: 26px 22px; }
  .engage-card h3 { font-size: 1.3rem; }
  .engage-hl { box-shadow: var(--shadow); }

  /* FAQ */
  .faq-grid { gap: 32px; }
  .faq-list summary { padding: 16px 50px 16px 18px; font-size: .98rem; }
  .faq-list summary::after { right: 16px; }
  .faq-list details p { padding: 0 18px 18px; font-size: 15px; }

  /* Contact */
  .contact-grid { gap: 36px; }
  .contact-next { margin-top: 26px; gap: 10px; }
  .contact-form { padding: 24px 18px; border-radius: 18px; }
  .contact-form h3 { font-size: 1.3rem; margin-bottom: 18px; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .field { margin-bottom: 14px; }
  .btn-block { padding: 17px 24px; }

  /* Footer */
  .site-footer { padding-top: 56px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; padding-bottom: 40px; }
  .footer-col h4 { margin-bottom: 8px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 4px; padding: 18px 0 calc(20px + env(safe-area-inset-bottom)); }
  .footer-bottom p { font-size: 13px; }

  .js .reveal { transform: translateY(16px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .why-art .bar { transform: none; }
}