/* ================================================================
   Gulfside Aerials — design system
   Light, airy, coastal. Amber sunset accent over sand and open sky.
   ================================================================ */

:root {
  --bg: #faf7f1;
  --bg-2: #f1ece1;
  --surface: #ffffff;
  --surface-2: #edf3f7;
  --field-bg: rgba(18, 32, 58, 0.04);
  --line: rgba(18, 32, 58, 0.11);
  --ink: #12203a;
  --ink-2: #4b5d75;
  --ink-3: #5a6e88;
  --amber: #f5b942;
  --amber-deep: #e09a1f;
  --amber-ink: #8f5a0a;
  --sky: #2e9fc6;
  --sky-bright: #0e7490;
  --go: #0f9d6e;
  --caution: #b9770e;
  --nogo: #d1453d;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow: 0 18px 44px rgba(18, 32, 58, 0.13);
  --font-display: "Sora", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --wrap: 1140px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 92px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--sky-bright); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.15; letter-spacing: -0.015em; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--amber-ink);
}
.eyebrow::before { content: ""; width: 26px; height: 1.5px; background: var(--amber-ink); }

.section { padding: 96px 0; position: relative; }
.section-head { max-width: 640px; margin-bottom: 46px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); margin: 12px 0 14px; }
.section-head p { color: var(--ink-2); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 26px; border-radius: 999px; border: 1px solid transparent;
  font: 600 15px var(--font-display); letter-spacing: 0.02em;
  cursor: pointer; transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  text-decoration: none !important;
}
.btn-primary {
  background: linear-gradient(120deg, var(--amber), var(--amber-deep));
  color: #1a1204;
  box-shadow: 0 8px 26px rgba(245, 185, 66, 0.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(245, 185, 66, 0.4); }
.btn-ghost { border-color: rgba(18, 32, 58, 0.28); color: var(--ink); background: rgba(18, 32, 58, 0.03); }
.btn-ghost:hover { background: rgba(18, 32, 58, 0.08); transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn[disabled] { opacity: 0.55; cursor: wait; transform: none; }

/* ------------------------------------------------------------- header */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 60;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
.site-header.scrolled {
  background: rgba(250, 247, 241, 0.86);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none !important; color: var(--ink); }
.brand svg { width: 38px; height: 38px; }
.brand-name { font: 700 18px var(--font-display); letter-spacing: 0.01em; }
.brand-name span { color: var(--amber-ink); }
.brand-sub { display: block; font-size: 10px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--ink-3); }

.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; }
.nav-links a { color: var(--ink-2); font-size: 14.5px; font-weight: 500; text-decoration: none !important; }
.nav-links a:hover { color: var(--ink); }
.nav-links a.btn-primary, .nav-links a.btn-primary:hover { color: #1a1204; }
.nav-links .btn { padding: 10px 20px; font-size: 13.5px; }
.nav-toggle { display: none; background: none; border: 0; color: var(--ink); font-size: 26px; cursor: pointer; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: fixed; top: 74px; right: 0; left: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: rgba(250, 247, 241, 0.98); backdrop-filter: blur(16px);
    padding: 10px 22px 24px; display: none; border-bottom: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .nav-links li { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .nav-links li:last-child { border: 0; padding-top: 20px; }
}

/* --------------------------------------------------------------- hero */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 78% 8%, rgba(245, 185, 66, 0.22), transparent 60%),
    radial-gradient(900px 500px at 12% 30%, rgba(46, 159, 198, 0.20), transparent 65%),
    linear-gradient(180deg, #eaf4fa 0%, #f7f4ec 55%, #fbf3de 100%);
}
.hero::after {
  /* horizon glow */
  content: ""; position: absolute; left: -10%; right: -10%; bottom: -2px; height: 38%;
  background: linear-gradient(180deg, transparent, rgba(46, 159, 198, 0.10) 55%, rgba(241, 236, 225, 0.9));
  pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 0; opacity: 0.6; pointer-events: none;
  background-image:
    linear-gradient(rgba(18, 32, 58, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 32, 58, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(closest-side at 50% 42%, black, transparent);
}
.cloud {
  position: absolute; border-radius: 999px; filter: blur(26px);
  background: rgba(120, 155, 190, 0.16); pointer-events: none;
}
.cloud-1 { width: 480px; height: 90px; top: 18%; left: -140px; animation: drift 64s linear infinite; }
.cloud-2 { width: 380px; height: 70px; top: 36%; right: -120px; animation: drift 88s linear infinite reverse; }
.cloud-3 { width: 560px; height: 110px; top: 62%; left: 30%; animation: drift 110s linear infinite; opacity: 0.7; }
@keyframes drift { from { transform: translateX(-12vw); } to { transform: translateX(112vw); } }

.hero-inner { position: relative; z-index: 2; padding: 130px 0 90px; width: 100%; }
.hero h1 {
  font-size: clamp(38px, 6.2vw, 72px);
  max-width: 13ch; margin: 18px 0 22px;
}
.hero h1 em { font-style: normal; color: var(--amber-ink); }
.hero-lead { max-width: 54ch; color: var(--ink-2); font-size: clamp(16px, 1.6vw, 19px); margin-bottom: 34px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 44px; }

.hero-drone {
  position: absolute; z-index: 1; right: 4%; top: 16%;
  width: min(400px, 34vw); pointer-events: none;
  animation: hover-float 5.5s ease-in-out infinite;
  filter: drop-shadow(0 30px 36px rgba(18, 32, 58, 0.22));
}
@keyframes hover-float {
  0%, 100% { transform: translateY(0) rotate(-1.2deg); }
  50% { transform: translateY(-16px) rotate(1.2deg); }
}
.prop { transform-origin: center; animation: spin 0.18s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 820px) { .hero-drone { opacity: 0.35; right: -12%; top: 10%; } }

/* HUD strip under hero copy */
.hud {
  display: inline-flex; flex-wrap: wrap; gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.62); backdrop-filter: blur(10px);
  overflow: hidden;
}
.hud-item { padding: 14px 22px; border-right: 1px solid var(--line); min-width: 128px; }
.hud-item:last-child { border-right: 0; }
.hud-label { font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); }
.hud-value { font: 700 20px var(--font-display); color: var(--ink); }
.hud-value small { font-size: 12px; color: var(--ink-2); font-weight: 500; }

.scroll-cue {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  color: var(--ink-3); font-size: 11px; letter-spacing: 0.25em; text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 8px; z-index: 2;
}
.scroll-cue::after {
  content: ""; width: 1px; height: 34px;
  background: linear-gradient(var(--amber-ink), transparent);
  animation: cue 1.8s ease-in-out infinite;
}
@keyframes cue { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }

/* ------------------------------------------------------- trust strip */
.trust { border-block: 1px solid var(--line); background: var(--bg-2); }
.trust-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0; text-align: center;
}
.trust-item { padding: 26px 16px; border-right: 1px solid var(--line); color: var(--ink-2); font-size: 14px; }
.trust-item:last-child { border-right: 0; }
.trust-item strong { display: block; color: var(--ink); font-family: var(--font-display); font-size: 15px; margin-bottom: 2px; }
@media (max-width: 700px) { .trust-item { border-right: 0; border-bottom: 1px solid var(--line); } .trust-item:last-child { border-bottom: 0; } }

/* ------------------------------------------------------------ services */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(285px, 1fr)); gap: 20px; }
.card {
  background: linear-gradient(165deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 30px 28px; position: relative; overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
.card:hover { transform: translateY(-5px); border-color: rgba(245, 185, 66, 0.35); box-shadow: var(--shadow); }
.card-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: rgba(46, 159, 198, 0.14); color: var(--sky-bright); margin-bottom: 18px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 15px; }
.card .from { display: inline-block; margin-top: 16px; font: 600 13px var(--font-display); color: var(--amber-ink); letter-spacing: 0.04em; }

/* ------------------------------------------------------------- gallery */
.gallery-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  grid-auto-rows: 220px; grid-auto-flow: dense;
}
.gallery-item {
  position: relative; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); cursor: zoom-in; background: var(--surface);
}
.gallery-item:nth-child(5n + 1) { grid-row: span 2; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-item figcaption {
  position: absolute; inset: auto 0 0 0; padding: 30px 16px 12px;
  background: linear-gradient(transparent, rgba(7, 12, 22, 0.85));
  font-size: 13px; color: var(--ink); opacity: 0; transition: opacity 0.25s ease;
}
.gallery-item:hover figcaption { opacity: 1; }

.gallery-empty {
  border: 1px dashed rgba(18, 32, 58, 0.22); border-radius: var(--radius-lg);
  padding: 70px 30px; text-align: center; color: var(--ink-2);
  background:
    radial-gradient(600px 200px at 50% 0%, rgba(46, 159, 198, 0.09), transparent),
    var(--bg-2);
}
.gallery-empty svg { margin: 0 auto 18px; opacity: 0.8; }
.gallery-empty strong { display: block; color: var(--ink); font-family: var(--font-display); font-size: 18px; margin-bottom: 6px; }

.lightbox {
  position: fixed; inset: 0; z-index: 90; display: none;
  background: rgba(5, 9, 17, 0.93); backdrop-filter: blur(6px);
  align-items: center; justify-content: center; padding: 4vmin;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 92vw; max-height: 86vh; border-radius: 10px; box-shadow: var(--shadow); }
.lightbox-close, .lightbox-nav {
  position: absolute; background: rgba(17, 26, 44, 0.8); color: #f2f5fa;
  border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 999px; cursor: pointer;
  width: 46px; height: 46px; font-size: 20px; display: grid; place-items: center;
}
.lightbox-close { top: 22px; right: 22px; }
.lightbox-prev { left: 18px; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 18px; top: 50%; transform: translateY(-50%); }
.lightbox-caption { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); color: #c7d0dd; font-size: 14px; }

/* ------------------------------------------------------------- pricing */
.price-note { font-size: 13.5px; color: var(--ink-3); margin-top: 26px; max-width: 62ch; }
.tier { display: flex; flex-direction: column; }
.tier .price { font: 700 38px var(--font-display); margin: 6px 0 2px; }
.tier .price small { font-size: 14px; color: var(--ink-2); font-weight: 500; }
.tier ul { list-style: none; margin: 18px 0 26px; flex: 1; }
.tier li { padding: 7px 0 7px 26px; position: relative; color: var(--ink-2); font-size: 14.5px; border-bottom: 1px dashed rgba(159, 176, 199, 0.12); }
.tier li:last-child { border-bottom: 0; }
.tier li::before { content: "✦"; position: absolute; left: 2px; color: var(--amber-ink); font-size: 12px; }
.tier.featured { border-color: rgba(224, 154, 31, 0.45); background: linear-gradient(165deg, #fff6e2, var(--bg-2)); }
.tier .tag {
  position: absolute; top: 18px; right: 18px;
  background: rgba(224, 154, 31, 0.16); color: var(--amber-ink);
  font: 600 11px var(--font-display); letter-spacing: 0.14em; text-transform: uppercase;
  padding: 5px 12px; border-radius: 999px;
}
.alacarte { margin-top: 26px; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; }
.alacarte-item {
  display: flex; justify-content: space-between; gap: 14px; align-items: baseline;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 15px 20px; font-size: 14.5px;
}
.alacarte-item span { color: var(--ink-2); }
.alacarte-item strong { color: var(--amber-ink); font-family: var(--font-display); white-space: nowrap; }

/* ---------------------------------------------------------- estimator */
.estimator {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--surface-2), var(--bg-2));
  padding: 34px; display: grid; gap: 28px;
  grid-template-columns: 1.2fr 0.8fr;
}
@media (max-width: 860px) { .estimator { grid-template-columns: 1fr; } }
.estimator h3 { font-size: 21px; margin-bottom: 4px; }
.est-fields { display: grid; gap: 16px; }
.field label { display: block; font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px; font-weight: 600; }
.field select, .field input, .field textarea {
  width: 100%; padding: 13px 15px; border-radius: 10px;
  background: var(--field-bg); border: 1px solid var(--line);
  color: var(--ink); font: 500 15px var(--font-body);
  transition: border-color 0.2s ease;
}
.field select:focus, .field input:focus, .field textarea:focus { outline: none; border-color: var(--sky); }
.field textarea { resize: vertical; min-height: 120px; }
.check-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.chip span {
  display: inline-block; padding: 9px 16px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--ink-2); font-size: 13.5px;
  transition: all 0.18s ease; cursor: pointer;
}
.chip input:checked + span { background: rgba(46, 159, 198, 0.18); border-color: var(--sky); color: var(--ink); }
.chip input:focus-visible + span { outline: 2px solid var(--sky); outline-offset: 2px; }

.est-result {
  border-left: 1px solid var(--line); padding-left: 28px;
  display: flex; flex-direction: column; justify-content: center; gap: 6px;
}
@media (max-width: 860px) { .est-result { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 22px; } }
.est-price { font: 700 clamp(34px, 4vw, 46px) var(--font-display); color: var(--amber-ink); }
.est-detail { color: var(--ink-2); font-size: 14px; min-height: 42px; }

/* ---------------------------------------------------------- flight lab */
.flightlab {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background:
    radial-gradient(800px 300px at 85% -20%, rgba(46, 159, 198, 0.12), transparent),
    linear-gradient(160deg, var(--surface), var(--bg-2));
  padding: 34px; overflow: hidden;
}
.fl-top { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; margin-bottom: 26px; }
.fl-controls { display: flex; gap: 10px; flex-wrap: wrap; }
.fl-controls select {
  padding: 11px 14px; border-radius: 10px; background: var(--field-bg);
  border: 1px solid var(--line); color: var(--ink); font: 500 14px var(--font-body);
}
.fl-controls .btn { padding: 10px 18px; font-size: 13px; }

.fl-grid { display: grid; grid-template-columns: 260px 1fr; gap: 30px; align-items: start; }
@media (max-width: 880px) { .fl-grid { grid-template-columns: 1fr; } }

.verdict {
  text-align: center; padding: 28px 18px; border-radius: var(--radius-lg);
  border: 1px solid var(--line); background: rgba(255, 255, 255, 0.55);
}
.verdict-ring {
  width: 148px; height: 148px; margin: 0 auto 16px; border-radius: 50%;
  display: grid; place-items: center; position: relative;
  border: 3px solid var(--line);
  font: 700 26px var(--font-display); letter-spacing: 0.06em;
  transition: border-color 0.4s ease, color 0.4s ease, box-shadow 0.4s ease;
}
.verdict-ring.go { border-color: var(--go); color: var(--go); box-shadow: 0 0 34px rgba(15, 157, 110, 0.22); }
.verdict-ring.caution { border-color: var(--caution); color: var(--caution); box-shadow: 0 0 34px rgba(185, 119, 14, 0.2); }
.verdict-ring.nogo { border-color: var(--nogo); color: var(--nogo); box-shadow: 0 0 34px rgba(209, 69, 61, 0.2); }
.verdict-ring .icon { position: absolute; top: 26px; font-size: 17px; }
.verdict-why { font-size: 13.5px; color: var(--ink-2); min-height: 40px; }

.cond-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 24px; }
.cond {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.6); padding: 14px 16px;
}
.cond .k { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
.cond .v { font: 700 21px var(--font-display); margin-top: 3px; }
.cond .v small { font-size: 12px; font-weight: 500; color: var(--ink-2); }

.wind-chart-wrap { border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255, 255, 255, 0.6); padding: 18px 18px 10px; }
.wind-chart-title { font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; display: flex; justify-content: space-between; }
.wind-chart-title .series-key { display: inline-flex; align-items: center; gap: 6px; text-transform: none; letter-spacing: 0; color: var(--ink-2); }
.series-swatch { width: 10px; height: 10px; border-radius: 3px; background: var(--sky); display: inline-block; }
#windChart { width: 100%; height: 130px; display: block; }
.golden {
  display: flex; flex-wrap: wrap; gap: 20px; margin-top: 22px;
  border-top: 1px dashed rgba(159, 176, 199, 0.16); padding-top: 18px;
  font-size: 14px; color: var(--ink-2);
}
.golden strong { color: var(--amber-ink); font-family: var(--font-display); }
.fl-footnote { margin-top: 20px; font-size: 12px; color: var(--ink-3); }
.fl-status { font-size: 13px; color: var(--ink-3); }

/* ------------------------------------------------------------- contact */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 46px; align-items: start; }
@media (max-width: 880px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-side h2 { font-size: clamp(28px, 4vw, 40px); margin: 12px 0 16px; }
.contact-side p { color: var(--ink-2); margin-bottom: 22px; }
.contact-meta { list-style: none; display: grid; gap: 12px; font-size: 15px; }
.contact-meta li { display: flex; gap: 12px; align-items: center; color: var(--ink-2); }
.contact-meta svg { color: var(--amber-ink); flex-shrink: 0; }

.contact-form {
  background: linear-gradient(160deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 32px; display: grid; gap: 16px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }
.form-status { font-size: 14.5px; min-height: 22px; }
.form-status.ok { color: var(--go); }
.form-status.err { color: var(--nogo); }

/* -------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 54px 0 34px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; margin-bottom: 36px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h4 { font-size: 14px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 14px; }
.site-footer ul { list-style: none; display: grid; gap: 9px; }
.site-footer a { color: var(--ink-2); font-size: 14.5px; }
.site-footer a:hover { color: var(--ink); }
.footer-brand p { color: var(--ink-2); font-size: 14.5px; max-width: 40ch; margin-top: 12px; }
.legal {
  border-top: 1px solid var(--line); padding-top: 22px;
  font-size: 12px; color: var(--ink-3); line-height: 1.7;
}
.legal p + p { margin-top: 6px; }

/* ------------------------------------------------------------ training */
.page-hero { padding: 170px 0 70px; position: relative; overflow: hidden;
  background:
    radial-gradient(900px 420px at 80% 0%, rgba(245, 185, 66, 0.20), transparent 60%),
    linear-gradient(180deg, #eaf4fa, var(--bg));
}
.page-hero h1 { font-size: clamp(34px, 5vw, 56px); max-width: 17ch; margin: 16px 0 18px; }
.page-hero p { max-width: 58ch; color: var(--ink-2); font-size: 17px; }

.curriculum { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; counter-reset: mod; }
.mod {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); padding: 22px; counter-increment: mod;
}
.mod::before {
  content: "0" counter(mod); font: 700 13px var(--font-display);
  color: var(--amber-ink); letter-spacing: 0.15em;
}
.mod h4 { font-size: 16px; margin: 8px 0 6px; }
.mod p { font-size: 13.5px; color: var(--ink-2); }

/* quiz */
.quiz {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(155deg, var(--surface-2), var(--bg-2));
  padding: 36px; max-width: 780px; margin: 0 auto;
}
.quiz-progress { display: flex; gap: 5px; margin-bottom: 26px; }
.quiz-progress i { flex: 1; height: 4px; border-radius: 4px; background: rgba(18, 32, 58, 0.12); }
.quiz-progress i.done { background: var(--sky); }
.quiz-progress i.current { background: var(--amber-deep); }
.quiz-q { font: 600 20px var(--font-display); margin-bottom: 8px; }
.quiz-meta { font-size: 12.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 18px; }
.quiz-opts { display: grid; gap: 11px; margin-bottom: 22px; }
.quiz-opt {
  text-align: left; padding: 15px 18px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--field-bg);
  color: var(--ink); font: 500 15px var(--font-body); cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.quiz-opt:hover { border-color: var(--sky); }
.quiz-opt.correct { border-color: var(--go); background: rgba(15, 157, 110, 0.1); }
.quiz-opt.wrong { border-color: var(--nogo); background: rgba(209, 69, 61, 0.1); }
.quiz-opt[disabled] { cursor: default; }
.quiz-explain {
  border-left: 3px solid var(--sky); padding: 10px 16px; margin-bottom: 22px;
  background: rgba(46, 159, 198, 0.07); border-radius: 0 10px 10px 0;
  color: var(--ink-2); font-size: 14.5px; display: none;
}
.quiz-explain.show { display: block; }
.quiz-actions { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; }
.quiz-score-line { color: var(--ink-2); font-size: 14px; }
.quiz-result { text-align: center; padding: 20px 0; }
.quiz-result .big { font: 700 56px var(--font-display); }
.quiz-result .big.pass { color: var(--go); }
.quiz-result .big.fail { color: var(--caution); }
.quiz-result p { color: var(--ink-2); max-width: 46ch; margin: 10px auto 24px; }

/* --------------------------------------------------------- reveal anim */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* stat counters */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 18px; }
.stat { text-align: center; padding: 26px 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.stat .n { font: 700 clamp(30px, 3.4vw, 42px) var(--font-display); color: var(--amber-ink); }
.stat .l { font-size: 13px; color: var(--ink-2); margin-top: 4px; }

/* 404 */
.err-page { min-height: 80vh; display: grid; place-items: center; text-align: center; padding: 120px 22px 60px; }
.err-page h1 { font-size: clamp(60px, 12vw, 130px); color: var(--amber-ink); }