/* Insulink — project homepage. Dark/light, indigo accent, GitHub-style dark base. */

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #1c2430;
  --border: #30363d;
  --border-strong: #4b4d55;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #536dfe;      /* Insulink indigoAccent */
  --accent-2: #7c8cff;
  --accent-strong: #3f51b5;
  --glow: rgba(83, 109, 254, 0.45);
  --danger: #f0616d;
  --radius: 18px;
  --maxw: 1120px;
  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --surface: #f6f8fa;
  --surface-2: #eef1f6;
  --border: #d0d7de;
  --border-strong: #c0c7d0;
  --text: #1f2328;
  --muted: #59636e;
  --accent: #3f51b5;
  --accent-2: #536dfe;
  --accent-strong: #283593;
  --glow: rgba(63, 81, 181, 0.3);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ambient glow behind the hero */
body::before {
  content: "";
  position: fixed;
  top: -20%;
  left: 50%;
  width: 900px;
  height: 900px;
  max-width: 120vw;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--glow) 0%, transparent 60%);
  filter: blur(40px);
  z-index: -1;
  pointer-events: none;
  opacity: 0.7;
}

h1, h2, h3 { font-family: var(--font-head); line-height: 1.12; font-weight: 600; letter-spacing: -0.02em; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.accent { color: var(--accent); }
.muted { color: var(--muted); }

.wrap { width: min(var(--maxw), 92%); margin: 0 auto; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  border: 1px solid var(--border-strong);
  color: var(--text);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary {
  border: none;
  color: #fff;
  background: radial-gradient(circle at center, var(--accent-strong) 0%, var(--accent) 85%);
  box-shadow: 0 0 25px var(--glow), 0 4px 10px rgba(0, 0, 0, 0.25);
}
.btn-primary:hover { color: #fff; filter: brightness(1.08); box-shadow: 0 0 40px var(--glow), 0 6px 14px rgba(0, 0, 0, 0.3); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; gap: 20px; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-head); font-weight: 700; font-size: 20px; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 28px; margin-left: 24px; }
.nav-links a { color: var(--muted); font-size: 15px; font-weight: 500; transition: color 0.15s; }
.nav-links a:hover { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.icon-btn {
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-head);
  font-weight: 600; font-size: 13px;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }

/* language dropdown */
.lang-dd { position: relative; }
.lang-dd .lang-current { width: auto; gap: 6px; padding: 0 12px; }
.lang-dd .flag { font-size: 13px; line-height: 1; }
.lang-menu {
  position: absolute; top: calc(100% + 8px); right: 0; z-index: 60;
  min-width: 148px; margin: 0; padding: 6px; list-style: none;
  background: var(--surface); border: 1px solid var(--border-strong);
  border-radius: 12px; box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
}
.lang-dd.open .lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-menu li {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px; cursor: pointer;
  color: var(--text); font-size: 14px; font-weight: 500;
}
.lang-menu li .flag { font-size: 15px; line-height: 1; }
.lang-menu li:hover { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }

.nav-toggle { display: none; }

/* ---------- sections ---------- */
section { padding: 90px 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-head); font-size: 13px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 7px 16px; margin-bottom: 22px;
}
.section-title { font-size: clamp(28px, 4vw, 42px); margin: 0 0 18px; }
.section-lead { color: var(--muted); font-size: 18px; max-width: 640px; margin: 0 0 50px; }

/* ---------- hero ---------- */
.hero { padding: 90px 0 70px; text-align: center; }
.hero .badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 26px; }
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 13px; font-weight: 600; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px;
  background: var(--surface);
}
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.hero-slogan { color: var(--accent); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: clamp(14px, 1.6vw, 17px); margin: 0 0 14px; }
.hero h1 { font-size: clamp(38px, 7vw, 72px); margin: 0 auto 22px; max-width: 15ch; }
.hero p.lead { color: var(--muted); font-size: clamp(17px, 2.2vw, 21px); max-width: 640px; margin: 0 auto 34px; }
.hero .cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.risk-note {
  display: flex; align-items: center; gap: 9px;
  margin: 32px auto 0; max-width: 560px;
  font-size: 13.5px; line-height: 1.5; color: var(--muted); text-align: left;
}
.risk-note svg { flex-shrink: 0; color: var(--accent); }

/* ---------- feature grid ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: 0 0 30px var(--glow); }
.card.featured {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 7%, var(--surface));
  box-shadow: 0 0 30px var(--glow);
}
.card .card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  margin-bottom: 18px;
}
.card .card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 20px; margin: 0 0 10px; }
.card p { color: var(--muted); margin: 0; font-size: 15px; }
.card .tag {
  display: inline-block; margin-top: 16px;
  font-family: var(--font-head); font-size: 12px; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--accent);
}

/* ---------- ecosystem (component split) ---------- */
.eco { display: flex; gap: 22px; align-items: stretch; }
.eco-item { flex: 1; }
.eco-item .num {
  font-family: var(--font-head); font-size: 14px; font-weight: 700;
  color: var(--accent); margin-bottom: 12px;
}

/* ---------- how it works ---------- */
.steps { counter-reset: step; }
.step { display: flex; gap: 22px; align-items: flex-start; padding: 26px 0; border-top: 1px solid var(--border); }
.step:first-child { border-top: none; }
.step .step-num {
  counter-increment: step;
  flex: none;
  width: 52px; height: 52px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head); font-weight: 700; font-size: 22px;
  color: var(--accent);
  border: 1px solid var(--border-strong);
}
.step .step-num::before { content: counter(step); }
.step h3 { margin: 6px 0 8px; font-size: 21px; }
.step p { margin: 0; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 4px 22px;
  margin-bottom: 14px;
  background: var(--surface);
  transition: border-color 0.2s;
}
.faq details[open] { border-color: var(--accent); }
.faq summary {
  cursor: pointer; list-style: none;
  font-family: var(--font-head); font-weight: 600; font-size: 18px;
  padding: 18px 0; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 24px; color: var(--accent); transition: transform 0.2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 20px; color: var(--muted); }

/* ---------- final CTA ---------- */
.cta-box {
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 26px;
  padding: 70px 30px;
  background:
    radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent) 14%, transparent) 0%, transparent 60%),
    var(--surface);
}
.cta-box h2 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 16px; }
.cta-box p { color: var(--muted); max-width: 520px; margin: 0 auto 30px; font-size: 18px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 60px 0 40px; color: var(--muted); }
.footer-top { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; margin-bottom: 40px; }
.footer-brand { max-width: 320px; }
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { font-size: 14px; margin: 0; }
.footer-cols { display: flex; gap: 60px; flex-wrap: wrap; }
.footer-col h4 { font-family: var(--font-head); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text); margin: 0 0 14px; }
.footer-col a { display: block; color: var(--muted); font-size: 14px; margin-bottom: 10px; transition: color 0.15s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid var(--border); padding-top: 26px; font-size: 13px; }
.footer-disclaimer { max-width: 720px; font-size: 12px; margin-top: 20px; opacity: 0.8; }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in-view { opacity: 1; transform: none; }

/* ---------- legal pages ---------- */
.legal { width: min(820px, 92%); margin: 60px auto 100px; }
.legal h1 { font-size: 40px; margin-bottom: 30px; }
.legal h2 { font-size: 26px; margin: 40px 0 14px; }
.legal h3 { font-size: 19px; margin: 28px 0 10px; }
.legal p, .legal li { color: var(--muted); }
.legal a { color: var(--accent); }
.legal ul { padding-left: 20px; }
.legal .index-link { color: var(--accent); }
.legal .back-link { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px; color: var(--muted); font-weight: 600; }
.legal .back-link:hover { color: var(--accent); }
.lang-note { border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; background: var(--surface); font-size: 14px; margin-bottom: 30px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .eco { flex-direction: column; }
  .footer-top { flex-direction: column; }
}
@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 4px;
    position: absolute; top: 72px; left: 0; right: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
    padding: 16px 4%; margin: 0;
  }
  .nav-links.open a { padding: 10px 0; }
  .login-label { display: none; }
}
@media (max-width: 560px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .step { flex-direction: column; gap: 14px; }
}