:root {
  color-scheme: light;
  --paper: #f7f8f4;
  --paper-strong: #ffffff;
  --ink: #15212b;
  --muted: #53626d;
  --line: rgba(21, 33, 43, 0.14);
  --blue: #315cf5;
  --blue-dark: #1e3eb9;
  --blue-soft: #e9edff;
  --mint: #b8e7cf;
  --mint-dark: #125f49;
  --orange: #ffb26b;
  --shadow-sm: 0 12px 30px rgba(18, 38, 31, 0.08);
  --shadow-lg: 0 28px 80px rgba(18, 38, 31, 0.14);
  --radius-sm: 14px;
  --radius: 24px;
  --radius-lg: 38px;
  --content: min(1180px, calc(100vw - 40px));
  --font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(169, 247, 210, 0.4), transparent 28rem),
    radial-gradient(circle at 90% 4%, rgba(49, 87, 246, 0.12), transparent 32rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: linear-gradient(rgba(16, 35, 29, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(16, 35, 29, 0.025) 1px, transparent 1px);
  background-size: 52px 52px;
  content: "";
  mask-image: linear-gradient(to bottom, black, transparent 62%);
  pointer-events: none;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--ink);
  color: white;
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.container { width: var(--content); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  backdrop-filter: blur(18px);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 8px 30px rgba(16, 35, 29, 0.06);
}

.nav-shell {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 780; letter-spacing: -0.03em; }
.brand img { width: 31px; height: 31px; }
.brand span { font-size: 1.08rem; }
.brand small { color: var(--blue); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }

.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a { color: var(--muted); font-size: 0.91rem; font-weight: 650; text-decoration: none; }
.site-nav a:hover { color: var(--ink); }
.site-nav a.button { color: #fff; }
.site-nav a.button:hover { color: #fff; }

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-strong);
  color: var(--ink);
}

.theme-toggle {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper-strong) 86%, transparent);
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 760;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--blue);
  box-shadow: 0 10px 24px rgba(49, 87, 246, 0.22);
  color: #fff;
  font-weight: 760;
  line-height: 1;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover { background: var(--blue-dark); box-shadow: 0 14px 32px rgba(49, 87, 246, 0.28); transform: translateY(-2px); }
.button.secondary { border-color: var(--line); background: rgba(255,255,255,0.75); box-shadow: none; color: var(--ink); }
.button.secondary:hover { background: #fff; box-shadow: var(--shadow-sm); }
.button.small { min-height: 40px; padding-inline: 16px; font-size: 0.88rem; }
.button.text { min-height: auto; padding: 0; background: transparent; box-shadow: none; color: var(--blue); }
.button.text:hover { background: transparent; box-shadow: none; transform: none; text-decoration: underline; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 14px;
  color: var(--blue-dark);
  font-size: 0.78rem;
  font-weight: 820;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.eyebrow::before { width: 22px; height: 2px; background: currentColor; content: ""; }

.hero {
  position: relative;
  min-height: 730px;
  overflow: clip;
  padding: 86px 0 72px;
  isolation: isolate;
}
.hero-artwork {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-color: #eef4fb;
  background-image: url("/media/installai-hero-light-desktop-poster.webp");
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}
.hero-artwork video {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-artwork video { z-index: 1; }
.hero-artwork [hidden] { display: none !important; }
.hero-artwork::after {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(90deg, rgba(247,248,244,0.97) 0%, rgba(247,248,244,0.86) 26%, rgba(247,248,244,0.3) 43%, transparent 58%);
  content: "";
}
.hero-grid { position: relative; z-index: 1; display: grid; min-height: 560px; align-items: center; grid-template-columns: minmax(440px, 0.86fr) minmax(500px, 1.14fr); gap: 34px; }
.hero-copy-block { position: relative; z-index: 4; max-width: 560px; }
.hero h1, .page-hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(3.2rem, 6.2vw, 6.35rem);
  font-weight: 760;
  letter-spacing: -0.072em;
  line-height: 0.94;
}

.hero h1 em { color: var(--blue); font-family: Georgia, serif; font-weight: 500; }
.hero-copy { max-width: 650px; margin: 26px 0 0; color: var(--muted); font-size: clamp(1.05rem, 1.7vw, 1.26rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-note { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 30px; color: var(--muted); font-size: 0.95rem; }
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.hero-note span::before { width: 7px; height: 7px; border-radius: 50%; background: var(--mint-dark); content: ""; }

.lift-stage {
  position: relative;
  min-height: 590px;
  perspective: 1200px;
}
.motion-toggle { position: absolute; right: max(20px, calc((100vw - 1180px) / 2)); bottom: 28px; z-index: 5; display: inline-flex; min-width: 44px; min-height: 44px; align-items: center; gap: 8px; padding: 0 15px; border: 1px solid var(--line); border-radius: 999px; background: color-mix(in srgb, var(--paper-strong) 90%, transparent); box-shadow: var(--shadow-sm); color: var(--muted); font-size: 0.82rem; font-weight: 760; backdrop-filter: blur(12px); }
.motion-toggle[hidden] { display: none !important; }

.stage-glow {
  position: absolute;
  inset: 14% 5% 5%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(49,87,246,0.12), rgba(169,247,210,0.08) 42%, transparent 72%);
  filter: blur(20px);
}

.orbit {
  position: absolute;
  inset: 11% 0 0;
  border: 1px solid rgba(49,87,246,0.2);
  border-radius: 50%;
  transform: rotate(-16deg);
}

.workflow-float {
  position: absolute;
  z-index: 2;
  width: min(360px, 76%);
  border: 1px solid rgba(16,35,29,0.1);
  border-radius: 21px;
  background: rgba(255,255,255,0.82);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  animation: float 7s ease-in-out infinite;
}

.workflow-float.one { top: 16px; left: 2%; transform: rotate(-3deg); }
.workflow-float.two { top: 190px; right: 0; animation-delay: -2s; transform: rotate(3deg); }
.workflow-float.three { right: 14%; bottom: 0; animation-delay: -4s; }

.float-head { display: flex; align-items: center; justify-content: space-between; padding: 15px 17px; border-bottom: 1px solid var(--line); }
.float-head strong { font-size: 0.86rem; }
.status { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 0.78rem; font-weight: 700; }
.status::before { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); content: ""; }
.status.approved::before { background: var(--mint-dark); }
.float-body { padding: 18px; }
.person { display: flex; align-items: center; gap: 11px; }
.avatar { display: grid; width: 38px; height: 38px; flex: 0 0 auto; place-items: center; border-radius: 12px; background: var(--blue-soft); color: var(--blue-dark); font-size: 0.78rem; font-weight: 820; }
.person p, .person small { margin: 0; }
.person p { font-size: 0.83rem; font-weight: 760; }
.person small { display: block; color: var(--muted); font-size: 0.76rem; }
.message { margin-top: 14px; padding: 12px 13px; border-radius: 13px; background: #f5f7f5; color: var(--muted); font-size: 0.84rem; }
.approval-row { display: flex; gap: 8px; margin-top: 14px; }
.approval-pill { padding: 8px 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 0.75rem; font-weight: 760; }
.approval-pill.primary { border-color: transparent; background: var(--mint); color: var(--mint-dark); }
.task-row { display: flex; align-items: center; gap: 10px; font-size: 0.79rem; font-weight: 690; }
.check { display: grid; width: 26px; height: 26px; place-items: center; border-radius: 50%; background: var(--mint); color: var(--mint-dark); }

@keyframes float {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -12px; }
}
:root[data-hero-motion="paused"] .workflow-float { animation-play-state: paused; }

.trust-strip { border-block: 1px solid var(--line); background: rgba(255,255,255,0.47); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { padding: 22px 24px; border-right: 1px solid var(--line); }
.trust-item:last-child { border: 0; }
.trust-item strong { display: block; font-size: 0.93rem; }
.trust-item span { color: var(--muted); font-size: 0.94rem; }

.section { padding: 110px 0; }
.section.tight { padding: 76px 0; }
.section.alt { border-block: 1px solid var(--line); background: rgba(255,255,255,0.56); }
.section.dark { background: var(--ink); color: #eef8f3; }
.section-head { display: grid; align-items: end; grid-template-columns: 1fr minmax(280px, 0.54fr); gap: 60px; margin-bottom: 48px; }
.section-head h2 { max-width: 760px; margin: 0; font-size: clamp(2.3rem, 5vw, 4.5rem); letter-spacing: -0.055em; line-height: 1; }
.section-head p { margin: 0; color: var(--muted); }
.dark .section-head p { color: #b9c8c2; }
.dark .eyebrow { color: var(--mint); }

.workflow-demo { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 20px; }
.demo-story, .demo-board, .card, .price-card, .article-card, .planner-shell, .faq-list, .service-detail, .article-body {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.76);
  box-shadow: var(--shadow-sm);
}
.demo-story { padding: 32px; }
.demo-story h3 { margin: 0 0 12px; font-size: 1.45rem; }
.demo-story p { color: var(--muted); }
.demo-story ul { display: grid; gap: 11px; padding: 0; list-style: none; }
.demo-story li { display: flex; gap: 10px; }
.demo-story li::before { color: var(--blue); content: "↗"; font-weight: 900; }
.demo-board { padding: 14px; }
.board-top { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px 20px; }
.board-top small { color: var(--muted); }
.demo-track { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.demo-step { min-height: 235px; padding: 19px; border-radius: 18px; background: #f4f6f3; }
.demo-step:nth-child(2) { background: var(--blue-soft); }
.demo-step:nth-child(3) { background: #e6faef; }
.step-number { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 50%; background: #fff; color: var(--blue-dark); font-size: 0.75rem; font-weight: 850; }
.demo-step h3 { margin: 32px 0 8px; font-size: 1rem; }
.demo-step p { margin: 0; color: var(--muted); font-size: 0.94rem; }
.decision { margin-top: 24px; padding: 9px 10px; border: 1px solid rgba(16,35,29,0.1); border-radius: 10px; background: rgba(255,255,255,0.72); font-size: 0.78rem; font-weight: 740; }

.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card { position: relative; padding: 28px; overflow: hidden; }
.card::after { position: absolute; top: -38px; right: -35px; width: 100px; height: 100px; border-radius: 50%; background: var(--blue-soft); content: ""; }
.card:nth-child(2)::after { background: #e4faef; }
.card:nth-child(3)::after { background: #fff0df; }
.card:nth-child(4)::after { background: #eeeaff; }
.card-icon { display: grid; width: 44px; height: 44px; place-items: center; border-radius: 14px; background: var(--ink); color: #fff; font-weight: 800; }
.card h3 { margin: 42px 0 10px; font-size: 1.13rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; }
.card .tag { margin-top: 24px; }

.tag { display: inline-flex; padding: 6px 10px; border-radius: 999px; background: var(--blue-soft); color: var(--blue-dark); font-size: 0.69rem; font-weight: 820; letter-spacing: 0.05em; text-transform: uppercase; }
.tag.mint { background: #ddf8e9; color: var(--mint-dark); }
.tag.orange { background: #fff0df; color: #99520e; }

.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.workflow-card { min-height: 360px; padding: 30px; border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius); background: rgba(255,255,255,0.055); }
.workflow-card span { color: var(--mint); font-size: 0.73rem; font-weight: 820; letter-spacing: 0.1em; text-transform: uppercase; }
.workflow-card h3 { margin: 34px 0 12px; font-size: 1.45rem; }
.workflow-card p { color: #c8d4d0; font-size: 1rem; }
.workflow-card ul { display: grid; gap: 12px; margin: 30px 0 0; padding: 0; list-style: none; }
.workflow-card li { display: flex; gap: 9px; font-size: 0.94rem; }
.workflow-card li::before { color: var(--mint); content: "✓"; font-weight: 900; }

.process-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.process-step { min-height: 230px; padding: 23px 20px; background: rgba(255,255,255,0.84); }
.process-step b { color: var(--blue); font-size: 0.76rem; }
.process-step h3 { margin: 54px 0 8px; font-size: 0.94rem; }
.process-step p { margin: 0; color: var(--muted); font-size: 0.94rem; }

.boundary-grid { display: grid; grid-template-columns: 1fr 0.94fr; gap: 60px; align-items: center; }
.boundary-copy h2 { margin: 0; font-size: clamp(2.35rem, 5vw, 4.4rem); letter-spacing: -0.055em; line-height: 1; }
.boundary-copy > p { color: var(--muted); font-size: 1.04rem; }
.boundary-list { display: grid; gap: 14px; margin-top: 28px; }
.boundary-point { display: grid; grid-template-columns: 42px 1fr; gap: 12px; }
.boundary-point i { display: grid; width: 36px; height: 36px; place-items: center; border-radius: 11px; background: var(--blue-soft); color: var(--blue-dark); font-style: normal; font-weight: 850; }
.boundary-point strong { display: block; }
.boundary-point small { color: var(--muted); font-size: 1rem; }

.boundary-map { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow-lg); }
.map-label { margin-bottom: 15px; color: var(--muted); font-size: 0.74rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.map-node { padding: 17px; border: 1px solid var(--line); border-radius: 15px; }
.map-node strong { display: block; }
.map-node small { color: var(--muted); font-size: 1rem; }
.map-node.blue { border-color: transparent; background: var(--blue); color: #fff; }
.map-node.blue small { color: #ffffff; }
.map-node.private { background: var(--ink); color: #fff; }
.map-node.private small { color: #b9c8c2; }
.map-line { width: 2px; height: 25px; margin-left: 30px; background: var(--line); }
.map-split { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.concept-note { margin: 18px 0 0; color: var(--muted); font-size: 0.8rem; }

.pricing-intro { max-width: 740px; margin-bottom: 35px; }
.pricing-intro p { color: var(--muted); }
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.vps-choice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 26px; }
.vps-choice { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,0.76); box-shadow: var(--shadow-sm); }
.vps-choice h3 { margin: 22px 0 8px; font-size: 1.22rem; }
.vps-choice p, .vps-choice li { color: var(--muted); font-size: 0.94rem; }
.vps-choice ul { padding-left: 19px; }
.price-card { display: flex; min-height: 430px; flex-direction: column; padding: 30px; }
.price-card.featured { border-color: rgba(49,87,246,0.35); background: linear-gradient(160deg, #fff, #eef1ff); }
.price-card h3 { margin: 24px 0 7px; font-size: 1.3rem; }
.price { display: flex; align-items: baseline; gap: 7px; margin: 14px 0 18px; }
.price strong { font-size: 2.25rem; letter-spacing: -0.05em; }
.price span { color: var(--muted); font-size: 0.82rem; }
.price-card p, .price-card li { color: var(--muted); font-size: 0.94rem; }
.price-card ul { display: grid; gap: 10px; margin: 12px 0 28px; padding-left: 18px; }
.price-card .button { margin-top: auto; }
.price-note { margin-top: 22px; padding: 18px; border-radius: 14px; background: #fff6e9; color: #68451f; font-size: 0.84rem; }

.learn-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 16px; }
.article-card { padding: 28px; text-decoration: none; }
.article-card:hover h3 { color: var(--blue); }
.article-card.featured { min-height: 360px; background: linear-gradient(145deg, var(--ink), #1f4739); color: #fff; }
.article-card h3 { margin: 30px 0 10px; font-size: 1.25rem; line-height: 1.2; }
.article-card.featured h3 { margin-top: 100px; font-size: 1.8rem; }
.article-card p { margin: 0; color: var(--muted); font-size: 0.88rem; }
.article-card.featured p { color: #c5d1cd; }
.article-card small { color: var(--blue); font-weight: 800; }

.planner-shell { display: grid; grid-template-columns: 0.72fr 1.28fr; overflow: hidden; }
.planner-copy { padding: 42px; background: var(--ink); color: #fff; }
.planner-copy h2 { margin: 0; font-size: 2.6rem; letter-spacing: -0.045em; line-height: 1; }
.planner-copy p { color: #b9c8c2; }
.privacy-callout { margin-top: 35px; padding: 16px; border: 1px solid rgba(255,255,255,0.12); border-radius: 14px; font-size: 0.78rem; }
.planner-form { padding: 42px; background: #fff; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: grid; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 0.81rem; font-weight: 760; }
.field input, .field textarea, .field select {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fafbf9;
  color: var(--ink);
}
.field textarea { min-height: 108px; resize: vertical; }
.field small { color: var(--muted); font-size: 0.78rem; }
.form-actions { display: flex; align-items: center; gap: 16px; margin-top: 22px; }
.form-actions small { color: var(--muted); }
.form-result { display: none; margin-top: 22px; padding: 18px; border-radius: 14px; background: #e5f9ee; color: var(--ink); }
.form-result.is-visible { display: block; }
.form-result h3 { margin: 0 0 6px; font-size: 1rem; }
.form-result p { margin: 0 0 12px; font-size: 0.82rem; }
.form-result pre { max-height: 190px; overflow: auto; padding: 13px; border-radius: 10px; background: rgba(255,255,255,0.8); white-space: pre-wrap; font: 0.74rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }

.faq-list { overflow: hidden; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item:last-child { border: 0; }
.faq-item button { display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 20px; padding: 23px 26px; border: 0; background: transparent; color: var(--ink); text-align: left; font-weight: 760; }
.faq-item button::after { color: var(--blue); content: "+"; font-size: 1.4rem; }
.faq-item button[aria-expanded="true"]::after { content: "−"; }
.faq-answer { display: none; padding: 0 26px 24px; color: var(--muted); }
.faq-answer.is-open { display: block; }
.faq-answer p { margin: 0; }

.site-footer { padding: 60px 0 28px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.25fr repeat(3, 0.6fr); gap: 40px; }
.footer-copy { max-width: 340px; color: var(--muted); font-size: 0.86rem; }
.footer-group strong { display: block; margin-bottom: 12px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }
.footer-group a { display: block; margin: 8px 0; color: var(--muted); font-size: 0.84rem; text-decoration: none; }
.footer-group a:hover { color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.8rem; }

.page-hero { padding: 84px 0 68px; }
.page-hero h1 { max-width: 960px; font-size: clamp(3rem, 6.4vw, 6.2rem); }
.page-hero p { max-width: 720px; margin: 24px 0 0; color: var(--muted); font-size: 1.15rem; }
.service-stack { display: grid; gap: 18px; }
.service-detail { display: grid; grid-template-columns: 0.75fr 1.25fr; gap: 45px; padding: 36px; }
.service-detail h2 { margin: 0; font-size: 1.8rem; letter-spacing: -0.035em; }
.service-detail h3 { margin: 0 0 12px; font-size: 0.88rem; text-transform: uppercase; letter-spacing: 0.08em; }
.service-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.service-detail ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 0.87rem; }
.service-detail li + li { margin-top: 8px; }

.library-toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.library-controls { margin-bottom: 30px; }
.search-field { display: grid; max-width: 680px; gap: 8px; margin-bottom: 18px; color: var(--ink); font-size: 0.82rem; font-weight: 760; }
.search-field input { min-height: 52px; padding: 12px 15px; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: var(--ink); }
.library-count { margin: -10px 0 0; color: var(--muted); font-size: 0.82rem; }
.filter-button { padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-size: 0.78rem; font-weight: 760; }
.filter-button[aria-pressed="true"] { border-color: var(--blue); background: var(--blue); color: #fff; }
.library-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.article-library .article-card { display: block; min-height: 250px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,0.78); box-shadow: var(--shadow-sm); }
.article-library .article-card h2 { margin: 28px 0 10px; font-size: 1.18rem; line-height: 1.25; }
.library-item[hidden] { display: none; }
.coming-soon { border-style: dashed; box-shadow: none; }

.article-layout { display: grid; grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr); gap: 70px; align-items: start; }
.article-aside { position: sticky; top: 110px; }
.article-aside p { color: var(--muted); }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.article-body { padding: 46px; }
.article-body h2 { margin: 46px 0 12px; font-size: 1.8rem; letter-spacing: -0.03em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin-top: 30px; }
.article-body p, .article-body li { color: var(--muted); }
.article-body blockquote { margin: 30px 0; padding: 18px 22px; border-left: 4px solid var(--blue); background: var(--blue-soft); color: var(--ink); }
.article-body code { padding: 2px 5px; border-radius: 5px; background: #edf0ed; font-size: 0.85em; }
.article-body a { color: var(--blue-dark); font-weight: 680; text-underline-offset: 3px; }
.article-body li + li { margin-top: 9px; }
.article-sources { margin-top: 48px; padding-top: 12px; border-top: 1px solid var(--line); }
.article-sources small { color: var(--muted); }
.article-caution { margin-top: 38px; padding: 20px; border-radius: 16px; background: #fff6e9; color: #68451f; }
.article-caution p { margin-bottom: 0; color: #68451f; }

.course-preview { display: grid; grid-template-columns: 0.75fr 1.25fr; gap: 48px; align-items: center; }
.course-preview-copy h2 { margin: 0; font-size: clamp(2.2rem, 4.4vw, 4rem); letter-spacing: -0.05em; line-height: 1; }
.course-preview-copy p, .course-preview-copy li { color: var(--muted); }
.course-preview-copy ul { padding-left: 20px; }
.video-shell { padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-lg); }
.video-shell video { width: 100%; border-radius: 16px; background: var(--ink); aspect-ratio: 16 / 9; }
.media-note { margin: 10px 6px 2px; color: var(--muted); font-size: 0.78rem; }
.course-series-grid { display: grid; gap: 20px; }
.course-series { padding: 34px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,0.82); box-shadow: var(--shadow-sm); }
.course-series-head { display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: start; }
.course-series h2 { margin: 12px 0 4px; font-size: 1.65rem; }
.course-series p { margin: 0; color: var(--muted); }
.lesson-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 28px 0 0; padding: 1px; border-radius: 16px; overflow: hidden; background: var(--line); list-style: none; }
.lesson-list li { display: grid; grid-template-columns: auto 1fr; gap: 13px; align-items: start; padding: 17px; background: #fff; }
.lesson-list li > span { color: var(--blue); font-size: 0.74rem; font-weight: 850; }
.lesson-list strong, .lesson-list small, .lesson-list em { display: block; }
.lesson-list small { margin-top: 3px; color: var(--muted); }
.lesson-list em { grid-column: 2; color: #99520e; font-size: 0.72rem; font-style: normal; font-weight: 760; }
.article-body .checklist { padding: 0; list-style: none; }
.article-body .checklist li { display: flex; gap: 10px; margin: 10px 0; }
.article-body .checklist li::before { color: var(--mint-dark); content: "✓"; font-weight: 900; }

.api-callout { display: grid; grid-template-columns: 1fr auto; gap: 22px; align-items: center; margin-top: 34px; padding: 22px; border: 1px solid rgba(169,247,210,0.35); border-radius: 16px; background: rgba(169,247,210,0.08); }
.api-callout code { color: var(--mint); font-size: 0.82rem; }

.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.utility-dock { position: fixed; left: max(18px, env(safe-area-inset-left)); bottom: max(18px, env(safe-area-inset-bottom)); z-index: 80; display: grid; gap: 10px; justify-items: start; }
.utility-button { display: grid; width: 50px; height: 50px; place-items: center; border: 1px solid color-mix(in srgb, var(--blue) 45%, var(--line)); border-radius: 50%; background: var(--paper-strong); box-shadow: 0 14px 36px rgba(20, 35, 55, 0.2); color: var(--blue-dark); font-size: 1rem; font-weight: 850; }
.utility-button:hover { border-color: var(--blue); transform: translateY(-2px); }
.help-button { background: var(--blue); color: #fff; font-size: 1.35rem; }
.utility-panel { position: absolute; left: 0; bottom: 120px; width: min(360px, calc(100vw - 36px)); padding: 22px; border: 1px solid var(--line); border-radius: 22px; background: var(--paper-strong); box-shadow: 0 28px 90px rgba(8, 20, 38, 0.28); color: var(--ink); }
.utility-panel[hidden] { display: none; }
.utility-panel-head { display: flex; align-items: start; justify-content: space-between; gap: 18px; }
.utility-panel-head small { color: var(--blue-dark); font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.utility-panel h2 { margin: 2px 0 0; font-size: 1.55rem; }
.utility-panel p { color: var(--muted); }
.utility-close { display: grid; width: 40px; height: 40px; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: transparent; color: var(--ink); font-size: 1.3rem; }
.utility-option { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 13px 0; border-top: 1px solid var(--line); }
.utility-option strong, .utility-option small { display: block; }
.utility-option small { color: var(--muted); }
.utility-option input { width: 22px; height: 22px; accent-color: var(--blue); }
.utility-reset { margin-top: 12px; }
.utility-links { display: grid; gap: 9px; }
.utility-links a { padding: 12px 13px; border-radius: 12px; background: var(--blue-soft); color: var(--blue-dark); font-weight: 760; text-decoration: none; }

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #07111f;
  --paper-strong: #0e1a2d;
  --ink: #f4f7ff;
  --muted: #bcc9d9;
  --line: rgba(213, 227, 247, 0.18);
  --blue: #7d9dff;
  --blue-dark: #b3c5ff;
  --blue-soft: #172c59;
  --mint: #76d6ad;
  --mint-dark: #8be7c1;
  --orange: #ffc085;
  --shadow-sm: 0 12px 36px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 30px 90px rgba(0, 0, 0, 0.42);
}
:root[data-theme="dark"] body { background: radial-gradient(circle at 12% 8%, rgba(79, 221, 167, 0.13), transparent 28rem), radial-gradient(circle at 90% 4%, rgba(78, 113, 255, 0.19), transparent 34rem), var(--paper); }
:root[data-theme="dark"] body::before { background-image: linear-gradient(rgba(160, 190, 236, 0.055) 1px, transparent 1px), linear-gradient(90deg, rgba(160, 190, 236, 0.055) 1px, transparent 1px); }
:root[data-theme="dark"] .hero-artwork { background-color: #071426; background-image: url("/media/installai-hero-dark-desktop-poster.webp"); }
:root[data-theme="dark"] .hero-artwork::after { background: linear-gradient(90deg, rgba(7,17,31,0.97) 0%, rgba(7,17,31,0.87) 26%, rgba(7,17,31,0.32) 43%, transparent 58%); }
:root[data-theme="dark"] .site-header { background: color-mix(in srgb, var(--paper) 82%, transparent); }
:root[data-theme="dark"] .workflow-float,
:root[data-theme="dark"] .demo-story,
:root[data-theme="dark"] .demo-board,
:root[data-theme="dark"] .card,
:root[data-theme="dark"] .price-card,
:root[data-theme="dark"] .article-card,
:root[data-theme="dark"] .planner-shell,
:root[data-theme="dark"] .faq-list,
:root[data-theme="dark"] .service-detail,
:root[data-theme="dark"] .article-body,
:root[data-theme="dark"] .boundary-map,
:root[data-theme="dark"] .vps-choice,
:root[data-theme="dark"] .course-series,
:root[data-theme="dark"] .video-shell,
:root[data-theme="dark"] .utility-panel,
:root[data-theme="dark"] .utility-button { background: rgba(14, 26, 45, 0.91); }
:root[data-theme="dark"] .section.alt { background: rgba(14, 26, 45, 0.5); }
:root[data-theme="dark"] .trust-strip { background: rgba(14, 26, 45, 0.44); }
:root[data-theme="dark"] .button.secondary,
:root[data-theme="dark"] .nav-toggle,
:root[data-theme="dark"] .filter-button,
:root[data-theme="dark"] .search-field input { background: #101f35; color: var(--ink); }
:root[data-theme="dark"] .demo-step,
:root[data-theme="dark"] .message,
:root[data-theme="dark"] .field input,
:root[data-theme="dark"] .field textarea,
:root[data-theme="dark"] .field select,
:root[data-theme="dark"] .lesson-list li { background: #101f35; color: var(--ink); }
:root[data-theme="dark"] .demo-step:nth-child(2) { background: #172c59; }
:root[data-theme="dark"] .demo-step:nth-child(3) { background: #123729; }
:root[data-theme="dark"] .planner-form { background: #0e1a2d; }
:root[data-theme="dark"] .price-note,
:root[data-theme="dark"] .article-caution { background: #3a2917; color: #ffddb8; }
:root[data-theme="dark"] .article-caution p { color: #ffddb8; }
:root[data-theme="dark"] .tag.orange { background: #402915; color: #ffd2a4; }
:root[data-theme="dark"] .tag.mint { background: #123729; color: #a8f1d1; }
:root[data-theme="dark"] .api-callout code { color: #a8f1d1; }
:root[data-theme="dark"] .article-body code { background: #15253d; }
:root[data-theme="dark"] .site-nav { --paper-strong: #0e1a2d; }

:root[data-text-size="large"] { font-size: 112.5%; }
:root[data-contrast="high"] { --muted: #303b44; --line: rgba(21, 33, 43, 0.34); --blue-dark: #1638ad; }
:root[data-theme="dark"][data-contrast="high"] { --muted: #f2f6ff; --line: rgba(255,255,255,0.5); --blue-dark: #d7e0ff; }
:root[data-contrast="high"] .hero-artwork { filter: contrast(1.05); }
:root[data-contrast="high"] .hero-artwork::after { background: linear-gradient(90deg, var(--paper) 0%, color-mix(in srgb, var(--paper) 96%, transparent) 34%, color-mix(in srgb, var(--paper) 58%, transparent) 50%, transparent 66%); }
:root[data-reduce-motion="true"] *,
:root[data-reduce-motion="true"] *::before,
:root[data-reduce-motion="true"] *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
:root[data-reduce-motion="true"] .hero-artwork video,
:root[data-reduce-motion="true"] .motion-toggle { display: none !important; }

@media (max-width: 1020px) {
  .hero-grid { grid-template-columns: minmax(390px, 0.9fr) minmax(360px, 1.1fr); gap: 20px; }
  .hero h1 { font-size: clamp(3rem, 6.8vw, 5rem); }
  .hero-copy { max-width: 560px; }
  .lift-stage { width: 100%; }
  .card-grid { grid-template-columns: 1fr 1fr; }
  .process-grid { grid-template-columns: repeat(3, 1fr); }
  .workflow-demo, .planner-shell, .course-preview { grid-template-columns: 1fr; }
  .price-grid, .library-grid, .vps-choice-grid { grid-template-columns: 1fr 1fr; }
  .learn-grid { grid-template-columns: 1fr 1fr; }
  .article-card.featured { grid-column: 1 / -1; }
  .service-detail { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; gap: 34px; }
  .article-aside { position: static; }
}

@media (max-width: 820px) {
  .hero { min-height: 1120px; padding-top: 58px; padding-bottom: 40px; }
  .hero-artwork { background-image: url("/media/installai-hero-light-mobile-poster.webp"); background-position: center bottom; background-size: auto 100%; }
  .hero-artwork video { top: auto; bottom: 0; left: 50%; width: auto; height: 100%; transform: translateX(-50%); object-fit: contain; }
  .hero-artwork::after { background: linear-gradient(180deg, rgba(247,248,244,0.98) 0%, rgba(247,248,244,0.92) 33%, rgba(247,248,244,0.36) 48%, transparent 61%); }
  :root[data-theme="dark"] .hero-artwork { background-image: url("/media/installai-hero-dark-mobile-poster.webp"); }
  :root[data-theme="dark"] .hero-artwork::after { background: linear-gradient(180deg, rgba(7,17,31,0.99) 0%, rgba(7,17,31,0.93) 33%, rgba(7,17,31,0.4) 49%, transparent 62%); }
  :root[data-contrast="high"] .hero-artwork::after { background: linear-gradient(180deg, var(--paper) 0%, color-mix(in srgb, var(--paper) 98%, transparent) 38%, color-mix(in srgb, var(--paper) 64%, transparent) 54%, transparent 68%); }
  .hero-grid { display: block; min-height: 1000px; }
  .hero-copy-block { max-width: 650px; }
  .lift-stage { display: none; }
  .motion-toggle { right: 16px; bottom: 18px; }
  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 20px;
    left: 20px;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--paper-strong);
    box-shadow: var(--shadow-lg);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px; }
  .site-nav .button { margin-top: 6px; }
  .nav-toggle { display: block; }
  .theme-toggle [data-theme-label] { display: none; }
  .theme-toggle { min-width: 44px; padding-inline: 12px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-item:nth-child(2) { border-right: 0; }
  .trust-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .section-head { grid-template-columns: 1fr; gap: 20px; }
  .demo-track { grid-template-columns: 1fr; }
  .demo-step { min-height: 180px; }
  .demo-step h3 { margin-top: 20px; }
  .workflow-grid { grid-template-columns: 1fr; }
  .boundary-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  :root { --content: min(100% - 28px, 1180px); }
  .hero { min-height: 1070px; padding-top: 48px; }
  .hero-artwork { background-size: 100% auto; }
  .hero-artwork video { left: 0; width: 100%; height: auto; transform: none; }
  .hero-grid { min-height: 950px; }
  .hero h1, .page-hero h1 { font-size: clamp(2.75rem, 14.5vw, 4.7rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .section { padding: 80px 0; }
  .section-head h2, .boundary-copy h2 { font-size: 2.35rem; }
  .card-grid, .price-grid, .learn-grid, .library-grid, .vps-choice-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .price-card { min-height: auto; }
  .planner-copy, .planner-form, .article-body { padding: 26px; }
  .form-grid, .service-columns { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .service-detail { padding: 25px; }
  .map-split { grid-template-columns: 1fr; }
  .api-callout { grid-template-columns: 1fr; }
  .lesson-list { grid-template-columns: 1fr; }
  .course-series { padding: 24px; }
  .video-shell video { aspect-ratio: 9 / 16; max-height: 76vh; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .hero-artwork video, .motion-toggle { display: none !important; }
}
@media print {
  .site-header, .site-footer, .hero-actions, .nav-toggle { display: none; }
  body { background: #fff; }
  .section { padding: 32px 0; }
  .article-body { border: 0; box-shadow: none; padding: 0; }
}