:root {
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #dbe3ee;
  --surface: #ffffff;
  --surface-soft: #f6f8fb;
  --blue: #2563eb;
  --green: #059669;
  --amber: #d97706;
  --violet: #7c3aed;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f8fafc;
  font-family:
    "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 72px);
  color: #f8fafc;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.72), rgba(15, 23, 42, 0));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 180px;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.16);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
  line-height: 1.2;
}

.brand small {
  margin-top: 2px;
  color: rgba(248, 250, 252, 0.72);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 2.6vw, 32px);
  color: rgba(248, 250, 252, 0.84);
  font-size: 14px;
}

.nav-links a {
  white-space: nowrap;
}

.hero {
  position: relative;
  min-height: 88vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 130px clamp(20px, 7vw, 96px) 96px;
  color: #ffffff;
}

.hero-bg,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-bg {
  background:
    linear-gradient(90deg, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.64) 44%, rgba(15, 23, 42, 0.3) 100%),
    url("/assets/intrai-platform-screenshot.svg") center / cover no-repeat;
  transform: scale(1.02);
}

.hero-overlay {
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.1), rgba(15, 23, 42, 0.36)),
    radial-gradient(circle at 30% 55%, rgba(37, 99, 235, 0.25), transparent 34%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(860px, 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #93c5fd;
}

.hero h1 {
  margin: 0;
  font-size: clamp(54px, 9vw, 112px);
  line-height: 0.94;
  letter-spacing: 0;
}

.hero-subtitle {
  margin: 24px 0 0;
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.25;
}

.hero-copy {
  width: min(760px, 100%);
  margin: 22px 0 0;
  color: rgba(248, 250, 252, 0.86);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 36px;
}

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-trust li {
  padding: 8px 12px;
  border: 1px solid rgba(226, 232, 240, 0.24);
  border-radius: 8px;
  color: rgba(248, 250, 252, 0.9);
  background: rgba(15, 23, 42, 0.38);
  font-size: 13px;
  font-weight: 800;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 800;
}

.button.primary {
  color: #ffffff;
  background: var(--blue);
  box-shadow: 0 16px 36px rgba(37, 99, 235, 0.32);
}

.button.secondary {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.36);
  background: rgba(255, 255, 255, 0.1);
}

.button.full {
  width: 100%;
}

.section {
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px);
}

.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}

.two-column,
.split,
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
}

.section h2 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(32px, 4vw, 54px);
  line-height: 1.16;
  letter-spacing: 0;
}

.section-lead {
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.9;
}

.intro-band {
  background: #ffffff;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.assistant-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.assistant-card {
  min-height: 360px;
  padding: 24px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--blue);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 14px 42px rgba(15, 23, 42, 0.06);
}

.assistant-card.meeting {
  border-top-color: var(--green);
}

.assistant-card.contract {
  border-top-color: var(--amber);
}

.assistant-card.writing {
  border-top-color: var(--violet);
}

.assistant-kicker {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.assistant-card h3 {
  margin: 0;
  font-size: 26px;
}

.assistant-card p:not(.assistant-kicker) {
  min-height: 84px;
  margin: 18px 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.assistant-card ul {
  display: grid;
  gap: 8px;
  min-height: 92px;
  margin: 0 0 18px;
  padding: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
  list-style: none;
}

.assistant-card li {
  position: relative;
  padding-left: 16px;
}

.assistant-card li::before {
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: currentColor;
  content: "";
  transform: translateY(-50%);
}

.assistant-card span {
  display: block;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  word-break: break-word;
}

.deployment-band {
  color: #f8fafc;
  background: #111827;
}

.deployment-band .eyebrow {
  color: #93c5fd;
}

.deployment-band .section-lead {
  color: rgba(248, 250, 252, 0.74);
}

.proof-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.proof-list div {
  padding: 22px;
  border: 1px solid rgba(226, 232, 240, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.proof-list dt {
  margin: 0 0 10px;
  color: #93c5fd;
  font-weight: 800;
}

.proof-list dd {
  margin: 0;
  color: rgba(248, 250, 252, 0.86);
  line-height: 1.65;
}

.workflow-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.step {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.step span {
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
}

.step h3 {
  margin: 18px 0 12px;
  font-size: 24px;
}

.step p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.demo-includes {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.demo-includes strong {
  margin-right: 6px;
}

.demo-includes span {
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--ink-soft);
  background: var(--surface-soft);
  font-size: 14px;
  font-weight: 700;
}

.cta-band {
  color: #f8fafc;
  background:
    linear-gradient(120deg, rgba(37, 99, 235, 0.92), rgba(5, 150, 105, 0.86)),
    #0f172a;
}

.cta-band .eyebrow,
.cta-band .section-lead {
  color: rgba(248, 250, 252, 0.78);
}

.contact-panel {
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
}

.contact-line {
  margin: 0 0 16px;
  line-height: 1.7;
}

.trial-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.field {
  display: grid;
  gap: 8px;
}

.field.wide,
.trial-form .button {
  grid-column: 1 / -1;
}

.field label {
  color: rgba(248, 250, 252, 0.9);
  font-size: 14px;
  font-weight: 800;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 46px;
  padding: 12px 13px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  color: #0f172a;
  background: rgba(255, 255, 255, 0.92);
  font: inherit;
}

.field textarea {
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 3px solid rgba(191, 219, 254, 0.65);
  outline-offset: 2px;
}

.copy-status {
  min-height: 22px;
  margin: 12px 0 0;
  color: rgba(248, 250, 252, 0.84);
  font-size: 14px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 26px clamp(20px, 5vw, 72px);
  color: var(--muted);
  background: #ffffff;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

@media (max-width: 960px) {
  .site-header {
    position: absolute;
  }

  .nav-links {
    display: none;
  }

  .hero {
    min-height: 86vh;
    padding-top: 110px;
  }

  .two-column,
  .split,
  .contact-layout,
  .assistant-grid,
  .workflow-steps {
    grid-template-columns: 1fr;
  }

  .assistant-card p:not(.assistant-kicker) {
    min-height: auto;
  }

  .assistant-card,
  .assistant-card ul {
    min-height: auto;
  }
}

@media (max-width: 620px) {
  .hero {
    min-height: 84vh;
    padding-bottom: 70px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

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

  .trial-form {
    grid-template-columns: 1fr;
  }

  .section-head {
    display: block;
  }
}