/* ===================================================================
   SOiTA — design tokens
   Simplify, Optimize, Innovate, Transform — powered by IT & AI
=================================================================== */

:root {
  /* color */
  --bg: #F7F8FA;
  --surface: #FFFFFF;
  --ink: #14171C;
  --ink-soft: #545B66;
  --ink-faint: #8A909C;
  --line: #E3E6EB;
  --accent: #3452E1;
  --accent-dark: #263DB8;
  --accent-soft: #EEF1FD;
  --teal: #0EA894;
  --teal-soft: #E7F8F5;
  --cta-bg: #14171C;
  --nav-bg: rgba(247, 248, 250, 0.86);
  --btn-solid-bg: #14171C;
  --btn-solid-text: #FFFFFF;

  /* type */
  --display: 'Space Grotesk', 'Helvetica Neue', sans-serif;
  --body: 'Inter', 'Helvetica Neue', sans-serif;
  --mono: 'IBM Plex Mono', 'SFMono-Regular', monospace;

  /* layout */
  --max: 1120px;
  --radius: 10px;
  --radius-sm: 6px;
}

html[data-theme="dark"] {
  --bg: #101317;
  --surface: #171B21;
  --ink: #F1F2F4;
  --ink-soft: #A7ADB8;
  --ink-faint: #6B7280;
  --line: #262B33;
  --accent: #6C89FF;
  --accent-dark: #4C63D9;
  --accent-soft: rgba(108, 137, 255, 0.14);
  --teal: #2DD4BF;
  --teal-soft: rgba(45, 212, 191, 0.14);
  --cta-bg: #1B2340;
  --nav-bg: rgba(16, 19, 23, 0.86);
  --btn-solid-bg: #F1F2F4;
  --btn-solid-text: #14171C;
}

/* smooth theme transition */
body, .nav, .hero-visual, .feature-card, .signature, .sig-cell,
.cta-band, footer, input, textarea, select, .btn, .founder-note-block {
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); }
h3 { font-size: 1.15rem; }

p { margin: 0; color: var(--ink-soft); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.eyebrow::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--accent);
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.logo .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 36px;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a {
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-right { display: flex; align-items: center; gap: 20px; }

.btn {
  font-family: var(--body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--btn-solid-bg); color: var(--btn-solid-text); }
.btn-primary:hover { background: var(--accent); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-dark); }

.nav-toggle { display: none; }

/* ---------- sections ---------- */
section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 0;
}

.hero { padding: 88px 0 64px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { margin: 18px 0 22px; }
.hero .lede { font-size: 1.15rem; max-width: 46ch; }
.hero-cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 0.82rem; color: var(--ink-faint); }

/* hero visual — abstract "signal" panel */
.hero-visual {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px;
  position: relative;
  overflow: hidden;
}
.hero-visual-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: block;
}
.pulse-row { display: flex; align-items: flex-end; gap: 6px; height: 120px; margin-bottom: 18px; }
.pulse-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--accent), var(--teal));
  border-radius: 4px 4px 0 0;
  opacity: 0.85;
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scaleY(0.55); }
  50% { transform: scaleY(1); }
}
.hero-visual-metrics { display: flex; justify-content: space-between; border-top: 1px solid var(--line); padding-top: 16px; }
.metric-num { font-family: var(--mono); font-size: 1.3rem; font-weight: 600; color: var(--ink); }
.metric-label { font-size: 0.74rem; color: var(--ink-faint); margin-top: 2px; }

/* ---------- SOiTA signature strip ---------- */
.signature { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sig-head { max-width: 60ch; margin-bottom: 48px; }
.sig-head h2 { margin-top: 10px; }
.sig-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sig-cell {
  background: var(--surface);
  padding: 28px 22px 26px;
  cursor: pointer;
  transition: background 0.2s ease;
  position: relative;
}
.sig-cell:hover, .sig-cell.is-active { background: var(--accent-soft); }
.sig-letter {
  font-family: var(--mono);
  font-size: 2.6rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
}
.sig-cell.is-active .sig-letter, .sig-cell:hover .sig-letter { color: var(--accent); }
.sig-word {
  font-family: var(--body);
  font-weight: 700;
  font-size: 0.92rem;
  margin-top: 14px;
}
.sig-desc {
  font-size: 0.82rem;
  margin-top: 8px;
  color: var(--ink-soft);
  line-height: 1.5;
}
.sig-cell:last-child .sig-letter { color: var(--teal); }

/* ---------- feature grid ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin-top: 44px; }
.feature-card { background: var(--surface); padding: 32px 28px; }
.feature-index { font-family: var(--mono); font-size: 0.74rem; color: var(--ink-faint); margin-bottom: 18px; display: block; }
.feature-card h3 { margin-bottom: 10px; }
.feature-card p { font-size: 0.92rem; }

/* ---------- stat bar ---------- */
.stat-bar { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stat { padding: 34px 24px; text-align: center; border-left: 1px solid var(--line); }
.stat:first-child { border-left: none; }
.stat-num { font-family: var(--mono); font-size: 1.9rem; font-weight: 600; color: var(--ink); }
.stat-label { font-size: 0.8rem; color: var(--ink-faint); margin-top: 6px; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--cta-bg);
  color: #fff;
  border-radius: 18px;
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: #B7BCC6; margin-top: 10px; }
.cta-band .btn-accent { background: var(--accent); color: #fff; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 56px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand p { font-size: 0.88rem; max-width: 34ch; margin-top: 12px; }
.footer-col h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); margin-bottom: 14px; }
.footer-col a { display: block; font-size: 0.88rem; color: var(--ink-soft); margin-bottom: 10px; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 0.8rem; color: var(--ink-faint); flex-wrap: wrap; gap: 12px; }

/* ---------- page header (inner pages) ---------- */
.page-header { padding: 72px 0 48px; }
.page-header .eyebrow { margin-bottom: 16px; }
.page-header p.lede { font-size: 1.05rem; max-width: 56ch; margin-top: 16px; }

/* ---------- belief + stats ---------- */
.belief-copy { max-width: 68ch; }
.belief-copy p { color: var(--ink); font-size: 1.02rem; margin-bottom: 18px; }
.belief-copy p:last-child { margin-bottom: 0; }
.belief-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 40px;
}
.belief-stat { background: var(--surface); padding: 30px 26px; }
.belief-stat-num {
  font-family: var(--display);
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--ink);
}
.belief-stat-desc { font-size: 0.88rem; color: var(--ink-soft); margin-top: 10px; line-height: 1.5; }
.belief-stat-source {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  margin-top: 16px;
  display: block;
  letter-spacing: 0.02em;
}

/* ---------- founder's note ---------- */
.founder-note-block { border-left: 3px solid var(--accent); padding-left: 24px; }
.founder-note-block p { color: var(--ink); font-size: 1.02rem; margin-bottom: 18px; }
.founder-note-block p:last-of-type { margin-bottom: 0; }
.founder-signature {
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
}
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
.value-list { display: flex; flex-direction: column; gap: 24px; margin-top: 20px; }
.value-item { display: flex; gap: 16px; padding: 20px 0; border-top: 1px solid var(--line); }
.value-item:first-child { border-top: none; padding-top: 0; }
.value-letter { font-family: var(--mono); font-weight: 600; color: var(--accent); font-size: 1.1rem; min-width: 28px; }

.timeline { display: flex; flex-direction: column; margin-top: 8px; }
.timeline-item { display: grid; grid-template-columns: 90px 1fr; gap: 20px; padding: 22px 0; border-top: 1px solid var(--line); }
.timeline-item:first-child { border-top: none; }
.timeline-year { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-faint); }

/* ---------- pricing page ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 44px; align-items: stretch; }
.price-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 34px 28px; display: flex; flex-direction: column; }
.price-card.is-featured { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); position: relative; }
.price-tag { position: absolute; top: -13px; left: 28px; background: var(--accent); color: #fff; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; padding: 5px 10px; border-radius: 20px; }
.price-name { font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); }
.price-amount { font-family: var(--display); font-size: 2.4rem; font-weight: 600; margin: 14px 0 4px; }
.price-amount span { font-size: 0.95rem; font-weight: 500; color: var(--ink-faint); font-family: var(--body); }
.price-desc { font-size: 0.88rem; margin-bottom: 24px; }
.price-features { list-style: none; padding: 0; margin: 0 0 28px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.price-features li { font-size: 0.88rem; color: var(--ink); display: flex; gap: 10px; }
.price-features li::before { content: "—"; color: var(--accent); flex-shrink: 0; }
.price-card .btn { justify-content: center; width: 100%; }

.faq-list { margin-top: 20px; }
.faq-item { border-top: 1px solid var(--line); padding: 22px 0; }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item h3 { font-size: 1rem; margin-bottom: 8px; }
.faq-item p { font-size: 0.9rem; }

/* ---------- contact page ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.form-field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.form-field label { font-size: 0.82rem; font-weight: 600; color: var(--ink); }
.form-field input, .form-field textarea, .form-field select {
  font-family: var(--body);
  font-size: 0.94rem;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  resize: vertical;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.contact-info { display: flex; flex-direction: column; gap: 28px; }
.contact-info-item h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); margin-bottom: 8px; }
.contact-info-item p, .contact-info-item a { font-size: 0.98rem; color: var(--ink); }

.form-field input::placeholder, .form-field textarea::placeholder { color: var(--ink-faint); opacity: 1; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.theme-toggle:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; display: block; }
.theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.2, 0.7, 0.2, 1), transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* hero entrance (plays once on load, no scroll needed) */
.hero-enter {
  opacity: 0;
  transform: translateY(16px);
  animation: heroIn 0.8s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.hero-enter.delay-1 { animation-delay: 0.08s; }
.hero-enter.delay-2 { animation-delay: 0.18s; }
@keyframes heroIn {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-enter { opacity: 1; transform: none; animation: none; }
}

/* nav shrink on scroll */
.nav.is-scrolled { box-shadow: 0 1px 0 var(--line), 0 8px 24px -16px rgba(20, 23, 28, 0.25); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 8px 28px 20px;
  }
  .nav-links a { padding: 12px 0; border-top: 1px solid var(--line); }
  .nav-links a:first-child { border-top: none; }
  .nav-links.is-open { display: flex; }
  .nav-toggle { display: inline-flex; }
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .belief-stats { grid-template-columns: 1fr; }
  .sig-strip { grid-template-columns: 1fr; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band { flex-direction: column; text-align: left; }
}