/* DC CarShare landing page
   Dark, minimal, slick. Apple system font (SF Pro). No serif, no boxes-for-the-sake-of-it,
   no colourful bullet dots, no SVG, no em dashes. */

:root {
  --bg: #0A0D15;
  --bg-2: #0E121C;
  --line: rgba(255, 255, 255, 0.10);
  --line-soft: rgba(255, 255, 255, 0.07);
  --fg: #FFFFFF;
  --fg-2: rgba(255, 255, 255, 0.60);
  --fg-3: rgba(255, 255, 255, 0.40);
  --accent: #35D6A0;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
html, body { font-family: var(--sans); }
body { background: var(--bg); }

.bg-ink { background: var(--bg); }
.section   { background: var(--bg); }
.section-2 { background: var(--bg-2); }

/* ── Header ── */
#site-header { background: transparent; }
#site-header.is-scrolled {
  background: rgba(10, 13, 21, 0.72);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-link { transition: color 0.15s ease; }
.nav-link:hover { color: #fff; }

/* ── Hero glow ── */
.hero-glow {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(900px 460px at 18% -6%, rgba(53, 214, 160, 0.10), transparent 60%),
    radial-gradient(700px 420px at 95% 0%, rgba(53, 214, 160, 0.05), transparent 55%);
}

/* ── Typography ── */
.display-1 {
  font-weight: 600; letter-spacing: -0.03em; line-height: 1.03;
  font-size: clamp(2.6rem, 6.4vw, 5rem); color: #fff;
}
.display-2 {
  font-weight: 600; letter-spacing: -0.025em; line-height: 1.07;
  font-size: clamp(2rem, 4.4vw, 3.3rem); color: #fff;
}
.display-3 {
  font-weight: 600; letter-spacing: -0.022em; line-height: 1.1;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem); color: #fff;
}
.display-stat {
  font-weight: 600; letter-spacing: -0.025em; line-height: 1.12;
  font-size: clamp(1.9rem, 4.6vw, 3.4rem); color: #fff;
}
.text-accent { color: var(--accent); }

/* ── Kicker (small label) ── */
.kicker {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent);
}

/* ── Numbered section label (number, long rule, name) ── */
.sec-label { display: flex; align-items: center; gap: 1.5rem; }
.sec-num { font-size: 0.9rem; font-weight: 600; color: var(--accent); letter-spacing: 0.05em; }
.sec-rule { flex: 1; height: 1px; background: var(--line); }
.sec-name { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--fg-3); }
.sec-label--sm { gap: 0; }
.sec-label--sm .sec-name { color: var(--accent); letter-spacing: 0.14em; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.6rem; border-radius: 0.6rem;
  font-size: 0.92rem; font-weight: 600; letter-spacing: -0.01em;
  border: 1px solid transparent; transition: all 0.18s ease;
}
.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.84rem; border-radius: 0.5rem; }
.btn-accent { background: var(--accent); color: #06231a; }
.btn-accent:hover { background: #46e6b0; transform: translateY(-1px); }
.btn-ghost { border-color: var(--line); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.05); }

/* ── Text link with arrow ── */
.text-link {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-size: 0.92rem; font-weight: 600; color: #fff;
  transition: gap 0.18s ease, color 0.18s ease;
}
.text-link:hover { gap: 0.8rem; color: var(--accent); }

/* ── Hero / problem stat features (embedded, no card) ── */
.stat-feat { }
.stat-big {
  font-weight: 600; letter-spacing: -0.03em; line-height: 1;
  font-size: clamp(2.4rem, 5vw, 3.6rem); color: #fff;
}
.stat-desc { margin-top: 1.1rem; color: var(--fg-2); line-height: 1.6; font-size: 1.02rem; max-width: 22rem; }

/* ── Approach / impact items (embedded) ── */
.approach-item { }
.approach-num { font-size: 1.4rem; font-weight: 600; letter-spacing: -0.02em; color: #fff; }
.approach-body { margin-top: 1rem; color: var(--fg-2); line-height: 1.7; }

/* ── How it works steps ── */
.step { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }
@media (min-width: 768px) {
  .step { grid-template-columns: 1fr 1fr; gap: 5rem; }
  .step--rev .step-text { order: 2; }
}
.step-n { font-size: 0.9rem; font-weight: 600; color: var(--accent); letter-spacing: 0.05em; }
.step-title { margin-top: 0.8rem; font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.18; color: #fff; }
.step-body { margin-top: 1rem; color: var(--fg-2); line-height: 1.7; font-size: 1.05rem; }
.step-media { width: 100%; }

/* ── App screenshot (slick frame on dark) ── */
.app-shot {
  display: block; border-radius: 0.9rem; border: 1px solid var(--line);
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255,255,255,0.02);
}
.shot {
  display: flex; align-items: center; justify-content: center; text-align: center;
  min-height: 14rem; padding: 1.5rem; border-radius: 0.9rem;
  background: rgba(255, 255, 255, 0.02); border: 1px dashed var(--line);
  color: var(--fg-3);
}
.shot span { font-size: 0.82rem; max-width: 22rem; }

/* ── Demo video (framed to match the app screenshots) ── */
.video-frame {
  position: relative; overflow: hidden;
  border-radius: 0.9rem; border: 1px solid var(--line); background: #000;
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.02);
}
.video-el {
  display: block; width: 100%; height: auto;
  aspect-ratio: 1280 / 698; background: #000;
}

/* ── Privacy feature cells (no boxes, no dots) ── */
.feat { }
.feat-title { font-size: 1.12rem; font-weight: 600; letter-spacing: -0.01em; color: #fff; }
.feat-body { margin-top: 0.6rem; color: var(--fg-2); line-height: 1.6; font-size: 0.98rem; }

/* ── Comparison (minimal, no bullet dots) ── */
.cmp-head { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-3); }
.cmp-line { padding: 1rem 0; border-top: 1px solid var(--line-soft); color: #fff; font-size: 1.02rem; }
.cmp-line:first-of-type { margin-top: 1.2rem; }
.cmp-col--muted .cmp-line { color: var(--fg-3); }

/* ── Why it matters context ── */
.ctx-h { font-size: 1.1rem; font-weight: 600; color: #fff; }
.ctx-b { margin-top: 0.6rem; color: var(--fg-2); line-height: 1.6; font-size: 0.98rem; }

/* ── Impact measures ── */
.measure { font-size: 1.3rem; font-weight: 600; letter-spacing: -0.02em; color: var(--accent); }
.measure-cap { margin-top: 0.6rem; color: var(--fg-3); font-size: 0.95rem; }

/* ── Built by students orgs (minimal outlined, not coloured pills) ── */
.org {
  display: inline-flex; align-items: center; padding: 0.6rem 1.2rem;
  border: 1px solid var(--line); border-radius: 0.6rem;
  font-size: 0.95rem; font-weight: 500; color: rgba(255,255,255,0.85);
}

/* ── Scaling path ── */
.scale-path {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem;
  font-size: clamp(1.3rem, 3vw, 2rem); font-weight: 600; letter-spacing: -0.02em; color: #fff;
}
.scale-sep { color: var(--accent); font-weight: 400; }

/* ── Scroll reveal ── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; will-change: opacity, transform; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}