/**
 * ICU IV FREE — LANDING PAGE STYLES
 * Shares the clinical palette with the calculator (styles.css) but is a
 * dedicated stylesheet for the marketing/discovery surface: homepage,
 * about, privacy, references.
 */

:root {
  --ink: #0a1628;
  --ink-soft: #16243d;
  --paper: #f7f8fa;
  --card: #ffffff;
  --line: #e2e6ec;
  --primary: #0066cc;
  --primary-deep: #004a99;
  --clinical-red: #b0281f;
  --clinical-amber: #b3690b;
  --clinical-green: #146c3f;
  --text: #1c2431;
  --text-mute: #5b6472;
  --text-faint: #8891a0;
  --radius: 10px;
  --serif: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--serif);
  color: var(--text);
  background: var(--paper);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* ---------- Skip link / accessibility ---------- */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: #fff; padding: 10px 16px; z-index: 1000;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Sticky nav ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247, 248, 250, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 16px; color: var(--ink);
}
.nav-brand img { width: 32px; height: 32px; border-radius: 7px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav-links a { color: var(--text-mute); font-weight: 500; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  background: var(--primary); color: #fff !important; padding: 9px 18px;
  border-radius: 7px; font-weight: 600; font-size: 14px;
}
.nav-cta:hover { background: var(--primary-deep); text-decoration: none; }
.nav-toggle { display: none; }

@media (max-width: 760px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-soft) 100%);
  color: #eef2f8;
  padding: 76px 0 64px;
}
.hero .wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.18);
  color: #cfe0ff; font-size: 12.5px; font-weight: 600; letter-spacing: 0.02em;
  padding: 6px 12px; border-radius: 999px; margin-bottom: 20px;
}
.badge::before { content: '●'; color: #4ade80; font-size: 10px; }

.hero h1 {
  font-size: clamp(32px, 4.2vw, 46px);
  line-height: 1.12; letter-spacing: -0.01em; margin: 0 0 18px 0; font-weight: 750;
}
.hero p.lede {
  font-size: 17px; color: #b9c4d6; max-width: 46ch; margin: 0 0 28px 0;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 8px; font-weight: 650; font-size: 15px;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: #2f7bff; color: #fff; }
.btn-primary:hover { background: #1f66e0; text-decoration: none; }
.btn-ghost { background: transparent; color: #eef2f8; border-color: rgba(255,255,255,0.28); }
.btn-ghost:hover { background: rgba(255,255,255,0.06); text-decoration: none; }
.micro { font-size: 12.5px; color: #8ea0bd; }

/* Illustrative calculation card (hero signature element) */
.calc-preview {
  background: #0d192c; border: 1px solid rgba(255,255,255,0.1);
  border-radius: 14px; padding: 22px; font-family: var(--mono);
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
}
.calc-preview .cp-tag {
  font-family: var(--serif); font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: #6f88ac; margin-bottom: 14px;
}
.cp-row { display: flex; justify-content: space-between; align-items: baseline; padding: 9px 0; border-bottom: 1px dashed rgba(255,255,255,0.09); font-size: 13.5px; }
.cp-row:last-child { border-bottom: none; }
.cp-row .k { color: #8ea0bd; }
.cp-row .v { color: #eaf1ff; font-weight: 600; }
.cp-row.result .v { color: #7fd0ff; font-size: 16px; }
.cp-drug { color: #ffb199; font-weight: 700; font-family: var(--serif); font-size: 15px; margin-bottom: 4px; }

/* ---------- Trust strip ---------- */
.trust-strip {
  background: var(--card); border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
.trust-strip .wrap {
  display: flex; flex-wrap: wrap; gap: 28px; justify-content: center;
  font-size: 13.5px; color: var(--text-mute); font-weight: 600;
}
.trust-strip .wrap span { display: flex; align-items: center; gap: 7px; }

/* ---------- Sections ---------- */
section { padding: 64px 0; }
section.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-eyebrow {
  font-size: 12.5px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--primary); margin-bottom: 10px;
}
.section-title { font-size: clamp(24px, 3vw, 32px); font-weight: 750; letter-spacing: -0.01em; margin: 0 0 12px 0; color: var(--ink); }
.section-sub { font-size: 15.5px; color: var(--text-mute); max-width: 62ch; margin: 0 0 36px 0; }

/* Capability grid */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.feature-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px;
}
.feature-card h3 { font-size: 16px; margin: 0 0 8px 0; color: var(--ink); }
.feature-card p { font-size: 13.5px; color: var(--text-mute); margin: 0; }
.feature-card .fi { font-size: 22px; margin-bottom: 12px; display: block; }

/* Category chips */
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; font-size: 13.5px; font-weight: 600; color: var(--text);
}

/* Three-step */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; counter-reset: step; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-left: 46px; }
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--ink); color: #fff; font-weight: 700; font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { font-size: 15.5px; margin: 4px 0 6px 0; }
.step p { font-size: 13.5px; color: var(--text-mute); margin: 0; }

/* Privacy architecture */
.privacy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .privacy-grid { grid-template-columns: 1fr; } }
.privacy-item {
  display: flex; gap: 12px; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px 18px;
}
.privacy-item .pi-mark { color: var(--clinical-green); font-weight: 800; font-size: 16px; line-height: 1.4; }
.privacy-item p { margin: 0; font-size: 13.5px; color: var(--text); }

/* Free vs Professional */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 760px) { .compare { grid-template-columns: 1fr; } }
.compare-card { border-radius: 14px; padding: 26px; border: 1px solid var(--line); background: var(--card); }
.compare-card.pro { background: var(--ink); color: #eef2f8; border-color: var(--ink); }
.compare-card h3 { margin: 0 0 6px 0; font-size: 18px; }
.compare-card .price { font-size: 13px; color: var(--text-mute); margin-bottom: 16px; }
.compare-card.pro .price { color: #9fb3d1; }
.compare-card ul { margin: 0; padding: 0 0 0 18px; font-size: 13.5px; line-height: 1.9; }
.compare-card.pro ul { color: #cdd8ea; }

/* Clinical scope */
.scope-box {
  background: #fff8ec; border: 1px solid #f0dcae; border-radius: var(--radius);
  padding: 20px 22px; font-size: 13.5px; color: #6b4b16; line-height: 1.7;
}

/* References */
.ref-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.ref-list li {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 16px; font-size: 13.5px; color: var(--text);
}
.ref-list strong { color: var(--ink); }

/* Arabic discovery section */
.arabic-section {
  background: var(--ink); color: #eef2f8; padding: 56px 0;
}
.arabic-section .wrap { text-align: center; }
.arabic-section h2 {
  font-size: clamp(24px, 3.4vw, 32px); margin: 0 0 14px 0; font-weight: 800;
}
.arabic-section p { font-size: 15.5px; color: #b9c4d6; max-width: 60ch; margin: 0 auto 20px; }
.arabic-terms { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 20px 0 28px; }
.arabic-terms span {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.16);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px;
}

/* Final CTA */
.final-cta { text-align: center; padding: 72px 0; }
.final-cta h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 14px 0; }
.final-cta p { color: var(--text-mute); margin: 0 0 26px 0; }

/* Footer */
footer.site-footer {
  background: var(--ink); color: #b9c4d6; padding: 48px 0 28px; font-size: 13px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-grid h4 { color: #eef2f8; font-size: 13px; margin: 0 0 12px 0; letter-spacing: 0.02em; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer-grid a { color: #9fb3d1; }
.footer-grid a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: #7d8fac;
}

/* Illustrative-example tag reused site-wide */
.illustrative-tag {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase; color: #6f88ac; margin-bottom: 8px;
}