/* =========================================================
   Carnegie-AI — Stylesheet
   ========================================================= */

:root {
  --bg:        #0b1020;
  --bg-soft:   #11182e;
  --surface:   #141c33;
  --card:      #161f3a;
  --text:      #e8ecf6;
  --text-dim:  #9aa5c0;
  --border:    rgba(255, 255, 255, 0.08);

  --brand:     #6c63ff;
  --brand-2:   #00d4ff;
  --accent:    #a855f7;

  --grad: linear-gradient(120deg, #6c63ff 0%, #a855f7 50%, #00d4ff 100%);

  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1140px;
  --shadow:    0 20px 50px -20px rgba(0, 0, 0, 0.6);

  --font:      'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-head: 'Space Grotesk', var(--font);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 10px 30px -10px rgba(108, 99, 255, 0.7);
}
.btn-primary:hover { box-shadow: 0 16px 40px -12px rgba(108, 99, 255, 0.85); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--brand-2); color: #fff; }
.btn-light {
  background: #fff;
  color: #0b1020;
}
.btn-sm { padding: 9px 18px; font-size: 0.9rem; }
.btn-block { width: 100%; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 16, 32, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.brand-mark { color: var(--brand-2); display: inline-flex; }
.brand-accent {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav {
  display: flex;
  align-items: center;
  gap: 30px;
}
.nav a {
  font-weight: 500;
  color: var(--text-dim);
  transition: color 0.18s ease;
}
.nav a:hover { color: var(--text); }
.nav a.btn { color: #fff; }
.nav a.btn-primary { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero, .page-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.hero { padding: 110px 0 90px; }
.page-hero { padding: 90px 0 60px; }

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(680px 380px at 15% 0%, rgba(108, 99, 255, 0.35), transparent 70%),
    radial-gradient(620px 420px at 90% 20%, rgba(0, 212, 255, 0.22), transparent 70%),
    radial-gradient(560px 420px at 60% 100%, rgba(168, 85, 247, 0.18), transparent 70%);
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 30%, #000 30%, transparent 78%);
  opacity: 0.5;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--brand-2);
  margin: 0 0 14px;
}
.hero-title {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  font-weight: 700;
}
.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-lead {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 0 34px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 56px;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
}
.stat { display: flex; flex-direction: column; }
.stat-num {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}
.stat-label { color: var(--text-dim); font-size: 0.9rem; margin-top: 6px; }

/* ---------- Sections ---------- */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-soft); border-block: 1px solid var(--border); }
.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  font-weight: 700;
}
.section-text { color: var(--text-dim); font-size: 1.05rem; margin: 0 0 16px; }
.section-text-center { max-width: 640px; margin-inline: auto; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .eyebrow { margin-bottom: 14px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}

/* ---------- Value list ---------- */
.value-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.value-list li {
  display: flex;
  gap: 16px;
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.value-icon { color: var(--brand-2); font-size: 1rem; margin-top: 4px; }
.value-list h3 { margin: 0 0 4px; font-size: 1.05rem; }
.value-list p { margin: 0; color: var(--text-dim); }

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(108, 99, 255, 0.5);
  box-shadow: var(--shadow);
}
.card-icon {
  font-size: 1.8rem;
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: rgba(108, 99, 255, 0.12);
  margin-bottom: 20px;
}
.card h3 { margin: 0 0 10px; font-size: 1.2rem; }
.card p { margin: 0; color: var(--text-dim); }

/* ---------- Steps ---------- */
.steps {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}
.step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
}
.step-num {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-bottom: 12px;
}
.step h3 { margin: 0 0 8px; font-size: 1.15rem; }
.step p { margin: 0; color: var(--text-dim); font-size: 0.96rem; }

/* ---------- CTA ---------- */
.cta {
  background: var(--grad);
  margin: 0;
}
.cta-inner {
  text-align: center;
  padding: 80px 24px;
}
.cta h2 {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 14px;
  color: #fff;
  letter-spacing: -0.02em;
}
.cta p { color: rgba(255, 255, 255, 0.9); font-size: 1.1rem; margin: 0 0 28px; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 56px;
  align-items: start;
}
.contact-form-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
}
.contact-form { display: grid; gap: 20px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 0.9rem; font-weight: 500; color: var(--text); }
.req { color: var(--brand-2); }
.field input,
.field select,
.field textarea {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.98rem;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.field textarea { resize: vertical; }
.field input::placeholder,
.field textarea::placeholder { color: #5f6a86; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.25);
}
.form-status { margin: 4px 0 0; font-size: 0.95rem; min-height: 1.2em; }
.form-status.success { color: #4ade80; }
.form-status.error { color: #f87171; }

.contact-info h2 { font-family: var(--font-head); font-size: 1.4rem; margin: 0 0 24px; }
.info-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.info-item:last-child { border-bottom: none; }
.info-icon {
  font-size: 1.2rem;
  width: 44px; height: 44px;
  flex-shrink: 0;
  display: grid; place-items: center;
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.1);
}
.info-item h3 { margin: 0 0 4px; font-size: 1rem; }
.info-item a, .info-item p { margin: 0; color: var(--text-dim); }
.info-item a:hover { color: var(--brand-2); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding-top: 56px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding-bottom: 40px;
}
.footer-brand p { color: var(--text-dim); margin: 12px 0 0; max-width: 260px; }
.footer-nav { display: flex; gap: 28px; flex-wrap: wrap; align-items: center; }
.footer-nav a { color: var(--text-dim); font-weight: 500; }
.footer-nav a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 24px;
  text-align: center;
}
.footer-bottom p { margin: 0; color: var(--text-dim); font-size: 0.9rem; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; gap: 40px; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 680px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px 24px;
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 12px 4px; }
  .nav a.btn { margin-top: 8px; text-align: center; }

  .hero { padding: 70px 0 60px; }
  .section { padding: 64px 0; }
  .card-grid, .steps { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .contact-form-wrap { padding: 24px; }
}