/* landing.css · LinkinCard · Apple, futur, confiance */

:root {
  --bg: #f4f4f6;
  --ink: #101014;
  --ink-2: #5f5f68;
  --line: rgba(16,16,20,0.09);
  --accent: #2456D6;
  --accent-2: #1B41A8;
  --dark: #0a0a0f;
  --sans: "Satoshi", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: var(--accent); color: #fff; }
a { color: inherit; }

/* grain */
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.04; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== Nav ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background 300ms ease, border-color 300ms ease, backdrop-filter 300ms ease;
}
.nav.scrolled {
  background: rgba(244,244,246,0.72);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: 1160px; margin: 0 auto; padding: 16px 28px;
  display: flex; align-items: center; gap: 26px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.mark { display: block; flex-shrink: 0; color: var(--ink); }
.brand .mark { width: 24px; height: 24px; }
.brand-name { font-family: "Quicksand", var(--sans); font-weight: 700; font-size: 1.16rem; letter-spacing: -0.01em; }
.mark-xl { width: 54px; height: 54px; margin: 0 auto 30px; color: var(--ink); }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--ink-2); text-decoration: none; font-size: 0.92rem; font-weight: 500; transition: color 140ms ease; }
.nav-links a:hover { color: var(--ink); }
.nav-cta { margin-left: 22px; }

/* ===== Pills ===== */
.pill {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-weight: 700; font-size: 0.92rem; letter-spacing: -0.01em;
  padding: 11px 20px; border-radius: 999px; text-decoration: none; cursor: pointer;
  border: 1px solid transparent;
  transition: transform 140ms ease, filter 140ms ease, background 140ms ease, color 140ms ease;
}
.pill:active { transform: scale(0.97); }
.pill-solid { background: var(--accent); color: #fff; }
.pill-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.pill-lg { padding: 14px 26px; font-size: 1rem; }
@media (hover: hover) and (pointer: fine) {
  .pill-solid:hover { filter: brightness(1.08); }
  .pill-ghost:hover { background: rgba(16,16,20,0.04); }
}

/* ===== Type ===== */
.kicker {
  font-family: var(--mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
  display: inline-block; margin-bottom: 22px;
}
.kicker.light { color: #86a6ff; }
.display {
  font-size: clamp(2.6rem, 6vw, 4.7rem); font-weight: 900; letter-spacing: -0.035em;
  line-height: 0.98; margin: 0 0 24px;
}
.display-2 {
  font-size: clamp(2rem, 4.4vw, 3.2rem); font-weight: 900; letter-spacing: -0.03em;
  line-height: 1.03; margin: 0;
}
.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem); line-height: 1.6; color: var(--ink-2);
  max-width: 46ch; margin: 0 0 32px;
}

/* ===== Hero ===== */
.hero { max-width: 1160px; margin: 0 auto; padding: 168px 28px 40px; position: relative; z-index: 2; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-visual { display: flex; justify-content: center; }

.mock {
  width: 100%; max-width: 420px; background: #fff;
  border: 1px solid var(--line); border-radius: 24px; padding: 24px 22px;
  box-shadow: 0 2px 4px rgba(16,16,20,0.03), 0 34px 64px rgba(16,16,20,0.12);
  animation: floaty 6.5s ease-in-out infinite;
}
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.mock-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.mock-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--mono); font-size: 0.7rem; color: var(--accent);
  background: rgba(36,86,214,0.09); padding: 5px 10px; border-radius: 999px;
}
.mock-step { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-2); }
.mock-bar { height: 5px; background: rgba(16,16,20,0.08); border-radius: 999px; overflow: hidden; margin-bottom: 20px; }
.mock-bar i { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.mock-q { font-size: 1.02rem; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 16px; }
.mock-opt {
  display: flex; align-items: center; gap: 11px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 12px; margin-bottom: 10px;
  font-size: 0.92rem; color: var(--ink-2);
}
.mock-opt .dot { width: 16px; height: 16px; border-radius: 50%; border: 2px solid rgba(16,16,20,0.2); flex-shrink: 0; }
.mock-opt.is-on { border-color: var(--accent); color: var(--ink); background: rgba(36,86,214,0.04); }
.mock-opt.is-on .dot { border: 5px solid var(--accent); }
.mock-file {
  display: flex; align-items: center; gap: 8px; margin-top: 14px; padding: 11px 14px;
  border-radius: 12px; background: rgba(16,16,20,0.03); font-size: 0.86rem; color: var(--ink);
}
.mock-lock {
  margin-left: auto; font-family: var(--mono); font-size: 0.66rem; color: var(--accent);
  background: rgba(36,86,214,0.1); padding: 3px 8px; border-radius: 999px;
}

/* trust strip */
.trust-strip {
  list-style: none; display: flex; flex-wrap: wrap; gap: 14px 30px;
  margin: 68px 0 0; padding: 28px 0 0; border-top: 1px solid var(--line);
}
.trust-strip li { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.03em; color: var(--ink-2); }
.trust-strip li::before { content: ""; display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); margin-right: 11px; vertical-align: 2px; }

/* ===== Sections ===== */
.section { max-width: 1160px; margin: 0 auto; padding: 104px 28px; position: relative; z-index: 2; }
.section-head { margin-bottom: 56px; }

/* how */
.steps { list-style: none; padding: 0; margin: 0; }
.step {
  display: grid; grid-template-columns: 130px 1fr; gap: 24px; align-items: start;
  padding: 34px 0; border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step-no { font-family: var(--mono); font-size: clamp(1.4rem, 3vw, 2rem); color: var(--accent); font-weight: 500; }
.step h3 { font-size: 1.5rem; font-weight: 900; letter-spacing: -0.02em; margin: 0 0 8px; }
.step p { color: var(--ink-2); font-size: 1.02rem; line-height: 1.55; max-width: 54ch; margin: 0; }

/* features */
.feature { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding: 44px 0; }
.feature-txt h3 { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 900; letter-spacing: -0.025em; line-height: 1.05; margin: 0 0 14px; }
.feature-txt p { color: var(--ink-2); font-size: 1.05rem; line-height: 1.6; max-width: 44ch; margin: 0; }
.feature.reverse .feature-txt { order: 2; }
.feature.reverse .feature-viz { order: 1; }
.feature-viz { display: flex; justify-content: center; }
.viz-card {
  width: 100%; max-width: 380px; background: #fff; border: 1px solid var(--line);
  border-radius: 20px; padding: 24px; box-shadow: 0 20px 50px rgba(16,16,20,0.07);
}
.viz-tag { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); background: rgba(36,86,214,0.09); padding: 5px 10px; border-radius: 999px; }
.viz-line { height: 12px; border-radius: 6px; background: rgba(16,16,20,0.08); margin-top: 16px; }
.viz-line.short { width: 62%; margin-top: 10px; }
.viz-check { display: flex; align-items: center; gap: 8px; margin-top: 20px; color: var(--accent); font-weight: 700; font-size: 0.9rem; }
.viz-docs { display: flex; gap: 10px; }
.viz-docs span { flex: 1; height: 96px; border-radius: 12px; background: rgba(16,16,20,0.05); border: 1px solid var(--line); position: relative; }
.viz-docs span::before { content: ""; position: absolute; left: 12px; right: 12px; top: 14px; height: 5px; border-radius: 3px; background: rgba(36,86,214,0.35); }
.viz-row { display: flex; align-items: center; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.viz-row:last-child { border-bottom: none; }
.viz-name { height: 10px; border-radius: 5px; background: rgba(16,16,20,0.14); width: 130px; }
.viz-name.short { width: 84px; }
.viz-badge { margin-left: auto; font-family: var(--mono); font-size: 0.64rem; padding: 3px 9px; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.04em; }
.viz-badge.ok { color: var(--accent); background: rgba(36,86,214,0.1); }
.viz-badge.wait { color: #a86717; background: rgba(168,103,23,0.12); }

/* security (dark block) */
.security { max-width: 1160px; margin: 40px auto; background: var(--dark); color: #fff; border-radius: 36px; padding: 96px 28px; }
.sec-inner { max-width: 1000px; margin: 0 auto; }
.security .display-2 { color: #fff; }
.sec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 48px; margin-top: 56px; }
.sec-item { border-top: 1px solid rgba(255,255,255,0.14); padding-top: 20px; }
.sec-item h3 { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.01em; margin: 0 0 10px; }
.sec-item p { color: rgba(255,255,255,0.6); line-height: 1.55; margin: 0; font-size: 0.98rem; }

/* final cta */
.cta-final { text-align: center; padding: 130px 28px; }
.cta-final .display-2 { margin-bottom: 32px; }

/* footer */
.foot { border-top: 1px solid var(--line); max-width: 1160px; margin: 0 auto; padding: 56px 28px 40px; position: relative; z-index: 2; }
.foot-inner { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.foot-brand { max-width: 300px; }
.foot-brand .mark { display: inline-block; width: 26px; height: 26px; vertical-align: -7px; margin-right: 10px; }
.foot-tag { color: var(--ink-2); font-size: 0.9rem; margin: 14px 0 0; line-height: 1.5; }
.foot-links { display: flex; flex-direction: column; gap: 12px; }
.foot-links a { color: var(--ink-2); text-decoration: none; font-size: 0.92rem; transition: color 140ms ease; }
.foot-links a:hover { color: var(--ink); }
.foot-bottom { display: flex; justify-content: space-between; margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--ink-2); font-family: var(--mono); font-size: 0.72rem; }

/* reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 720ms cubic-bezier(0.16,1,0.3,1), transform 720ms cubic-bezier(0.16,1,0.3,1); }
.reveal.in { opacity: 1; transform: none; }

/* responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero { padding-top: 128px; }
  .display { font-size: clamp(2.4rem, 11vw, 3.4rem); }
}
@media (max-width: 820px) {
  .feature { grid-template-columns: 1fr; gap: 30px; padding: 32px 0; }
  .feature.reverse .feature-txt { order: 0; }
  .feature.reverse .feature-viz { order: 0; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-inner { padding: 14px 20px; }
  .section { padding: 80px 22px; }
  .sec-grid { grid-template-columns: 1fr; gap: 28px; }
  .security { padding: 66px 22px; border-radius: 28px; }
  .step { grid-template-columns: 1fr; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}