:root {
  --bg: #FAFAF8;
  --surface: #FFFFFF;
  --muted-bg: #F3F3F0;
  --ink: #111111;
  --ink-2: #3D3D3A;
  --ink-3: #55554F;
  --line: #E4E4E0;
  --accent: #1F45D9;
  --accent-soft: #EAEFFD;
  --dark: #111111;
  --dark-2: #1C1C1A;
  --dark-line: #33332F;
  --dark-ink: #FAFAF8;
  --dark-ink-2: #D6D6CF;
  --dark-ink-3: #B8B8B0;
  --ai: #7FA0FF;
  --radius: 12px;
  --display: 'Archivo', system-ui, sans-serif;
  --body: 'IBM Plex Sans', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 16px; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand span { font-family: var(--display); font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.nav { display: flex; align-items: center; gap: 28px; font-size: 15px; font-weight: 500; }
.nav a { text-decoration: none; }
.nav a:hover { color: var(--accent); }
.nav .btn { padding: 0 18px; min-height: 40px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 24px; border-radius: 8px;
  font-weight: 600; font-size: 16px; text-decoration: none;
  border: 1.5px solid var(--ink); transition: background .15s, color .15s, border-color .15s;
}
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.eyebrow { font-family: var(--mono); font-size: 13px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin: 0; }
h1, h2, h3 { font-family: var(--display); margin: 0; letter-spacing: -0.03em; }

/* Hero */
.hero { padding: 96px 0 88px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 64px; align-items: end; }
.hero-copy { display: flex; flex-direction: column; gap: 28px; }
.hero h1 { font-weight: 800; font-size: clamp(40px, 6vw, 68px); line-height: 1.02; letter-spacing: -0.035em; }
.lead { margin: 0; font-size: 20px; color: var(--ink-2); max-width: 640px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; padding-top: 4px; }
.facts { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.facts li { padding: 20px 0; border-bottom: 1px solid var(--line); display: flex; flex-direction: column; gap: 2px; }
.facts li:last-child { border-bottom: 0; }
.facts strong { font-family: var(--display); font-weight: 700; font-size: 34px; letter-spacing: -0.02em; line-height: 1.15; }
.facts span { font-size: 15px; color: var(--ink-3); }

/* Cases */
.case { padding: 96px 0; }
.case-light { background: var(--surface); border-top: 1px solid var(--line); }
.case-dark { background: var(--dark); color: var(--dark-ink); }
.case .wrap { display: flex; flex-direction: column; gap: 48px; }
.case-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
.case-intro { display: flex; flex-direction: column; gap: 16px; }
.case-tag { font-family: var(--mono); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 0; }
.case-dark .case-tag { color: var(--dark-ink-3); }
.case h2 { font-weight: 800; font-size: clamp(36px, 4.5vw, 52px); line-height: 1.05; }
.case-intro p { margin: 0; font-size: 18px; color: var(--ink-2); }
.case-dark .case-intro p { color: var(--dark-ink-2); }
.challenge { padding: 24px; border-radius: var(--radius); background: var(--muted-bg); }
.case-dark .challenge { background: var(--dark-2); }
.challenge h3 { font-family: var(--body); font-size: 15px; font-weight: 600; letter-spacing: 0; margin-bottom: 8px; }
.challenge p { margin: 0; color: var(--ink-2); }
.case-dark .challenge p { color: var(--dark-ink-2); }

/* AI highlight */
.ai-block {
  display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 40px; align-items: center;
  padding: 40px; border-radius: 16px; background: var(--accent-soft);
}
.case-dark .ai-block { background: #18203A; }
.ai-label { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.case-dark .ai-label { color: var(--ai); }
.ai-text { display: flex; flex-direction: column; gap: 16px; }
.ai-text h3 { font-size: 30px; font-weight: 700; line-height: 1.12; }
.ai-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; counter-reset: s; }
.ai-steps li { position: relative; padding-left: 40px; color: var(--ink-2); }
.case-dark .ai-steps li { color: var(--dark-ink-2); }
.ai-steps li::before {
  counter-increment: s; content: counter(s);
  position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #fff; font-family: var(--mono); font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.case-dark .ai-steps li::before { background: var(--ai); color: #0B1430; }
.ai-steps strong { color: var(--ink); }
.case-dark .ai-steps strong { color: var(--dark-ink); }

/* Screenshot frames */
.shot { margin: 0; display: flex; flex-direction: column; gap: 12px; }
.frame {
  border-radius: 10px; overflow: hidden; background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 1px 2px rgba(17,17,17,.04), 0 12px 32px rgba(17,17,17,.08);
}
.case-dark .frame { border-color: #2A2A27; box-shadow: 0 16px 40px rgba(0,0,0,.45); }
.frame-bar { display: flex; gap: 6px; padding: 10px 14px; background: #F1F1EE; border-bottom: 1px solid var(--line); }
.case-dark .frame-bar { background: #222220; border-color: #2A2A27; }
.frame-bar i { width: 10px; height: 10px; border-radius: 50%; background: #D3D3CD; }
.case-dark .frame-bar i { background: #44443F; }
.frame img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; object-position: top left; }
.shot figcaption { font-size: 14px; color: var(--ink-3); display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.case-dark .shot figcaption { color: var(--dark-ink-3); }
.chip-ai { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; padding: 3px 8px; border-radius: 999px; background: var(--accent); color: #fff; }
.case-dark .chip-ai { background: var(--ai); color: #0B1430; }

.shots { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }

/* Metrics */
.metrics { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; border-top: 2px solid var(--ink); }
.case-dark .metrics { border-color: var(--dark-ink); }
.metrics li { padding-top: 18px; display: flex; flex-direction: column; gap: 2px; }
.metrics strong { font-family: var(--display); font-weight: 800; font-size: 44px; letter-spacing: -0.03em; line-height: 1.05; }
.metrics span { font-size: 15px; color: var(--ink-3); }
.case-dark .metrics span { color: var(--dark-ink-3); }
@media (max-width: 640px) { .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); } .metrics strong { font-size: 34px; } }

/* Feature cards */
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.feature { padding: 28px; border-radius: var(--radius); border: 1px solid var(--line); display: flex; flex-direction: column; gap: 12px; }
.case-dark .feature { border-color: var(--dark-line); }
.feature h3 { font-size: 21px; font-weight: 700; letter-spacing: -0.01em; }
.feature ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; color: var(--ink-2); }
.case-dark .feature ul { color: var(--dark-ink-2); }

.stack { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; font-family: var(--mono); font-size: 13px; }
.stack li { padding: 6px 12px; border-radius: 999px; background: var(--muted-bg); }
.case-dark .stack li { background: #262624; color: #E8E8E2; }

/* agenticQA */
.qa { padding: 80px 0; background: #100E1F; color: #E8E4F8; border-top: 1px solid var(--line); }
.qa-top { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 48px; padding-bottom: 32px; border-bottom: 1px solid rgba(167,139,250,.25); }
.qa-logo { height: 120px; width: auto; }
.qa-badge { margin: 0; font-family: var(--mono); font-size: 13px; color: #C4B5FD; border: 1px solid rgba(167,139,250,.45); border-radius: 999px; padding: 8px 16px; }
.qa .eyebrow { color: #A78BFA; }
.qa h2 { color: #F5F3FF; }
.qa .link-arrow { color: #F5F3FF; border-color: #A78BFA; }
.qa .link-arrow:hover { color: #C4B5FD; border-color: #C4B5FD; }
.nav-note { font-family: var(--mono); font-size: 11px; color: var(--ink-3); margin-left: 4px; }
.qa-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 64px; align-items: start; }
.qa-copy { display: flex; flex-direction: column; gap: 18px; }
.qa h2 { font-weight: 800; font-size: clamp(32px, 4vw, 44px); line-height: 1.05; }
.qa-lead { margin: 0; font-size: 18px; color: #CFC8EE; max-width: 600px; }
.link-arrow { align-self: flex-start; display: inline-flex; gap: 8px; font-weight: 600; text-decoration: none; padding: 6px 0; border-bottom: 1.5px solid var(--ink); }
.link-arrow:hover { color: var(--accent); border-color: var(--accent); }
.qa-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.qa-list li { display: flex; flex-direction: column; gap: 6px; padding-top: 16px; border-top: 1.5px solid rgba(167,139,250,.35); }
.qa-list strong { font-family: var(--display); font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.qa-list span { font-size: 15px; color: #B9B0DC; }
.brand img { height: 54px; width: auto; }
@media (max-width: 900px) { .qa-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; } }
@media (max-width: 640px) { .qa { padding: 56px 0; } .qa-list { grid-template-columns: minmax(0, 1fr); } .qa-logo { height: 96px; } .nav-note { display: none; } .brand img { height: 46px; } }

/* How I work */
.how { padding: 96px 0; }
.how .wrap { display: flex; flex-direction: column; gap: 48px; }
.how-head { display: flex; flex-direction: column; gap: 16px; max-width: 780px; }
.how h2 { font-weight: 800; font-size: clamp(32px, 4vw, 44px); line-height: 1.08; }
.principles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; list-style: none; margin: 0; padding: 0; }
.principles li { display: flex; flex-direction: column; gap: 10px; padding-top: 20px; border-top: 2px solid var(--ink); }
.principles .n { font-family: var(--mono); font-size: 13px; color: var(--ink-3); }
.principles h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.principles p { margin: 0; font-size: 15px; color: var(--ink-2); }

/* Contact */
.contact { padding: 96px 0; background: var(--surface); border-top: 1px solid var(--line); }
.contact .wrap { display: flex; flex-direction: column; gap: 24px; align-items: flex-start; }
.contact h2 { font-weight: 800; font-size: clamp(34px, 4.6vw, 54px); line-height: 1.04; letter-spacing: -0.035em; max-width: 900px; }
.contact p { margin: 0; font-size: 18px; color: var(--ink-2); max-width: 680px; }
.contact .eyebrow { font-size: 13px; color: var(--accent); }

.site-footer { border-top: 1px solid var(--line); padding: 28px 0; font-size: 14px; color: var(--ink-3); }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

/* Responsive */
@media (max-width: 1024px) {
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .hero-grid, .case-head, .ai-block { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .ai-block { padding: 28px; }
  .shots { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .nav a:not(.btn) { display: none; }
  .hero, .case, .how, .contact { padding: 64px 0; }
  .features, .principles { grid-template-columns: minmax(0, 1fr); }
  .lead { font-size: 18px; }
  .facts strong { font-size: 28px; }
  .ai-block { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }