/* ============================================================
   Aeropex — 2D FAU Product Website (Phase 1)
   Design system & global styles
   ============================================================ */

:root {
  /* Color — enterprise + AI optical-interconnect */
  --ink:        #0a1428;
  --ink-2:      #16243c;
  --ink-soft:   #3b4a63;
  --muted:      #5b6b84;
  --navy:       #0b1b33;
  --navy-2:     #0e2242;
  --navy-3:     #132b52;
  --line:       #e3e8f0;
  --line-soft:  #eef2f7;
  --bg:         #ffffff;
  --bg-soft:    #f5f8fc;
  --bg-tint:    #eef4fb;

  --cyan:       #00b8d9;
  --cyan-deep:  #0097b8;
  --blue:       #2f6bff;
  --violet:     #7b6cff;
  --teal:       #00c9a7;

  --grad:       linear-gradient(120deg, #00b8d9 0%, #2f6bff 52%, #7b6cff 100%);
  --grad-soft:  linear-gradient(120deg, rgba(0,184,217,.10), rgba(47,107,255,.10) 52%, rgba(123,108,255,.10));

  --shadow-sm:  0 1px 2px rgba(10,20,40,.05), 0 2px 8px rgba(10,20,40,.05);
  --shadow-md:  0 6px 24px rgba(10,20,40,.08);
  --shadow-lg:  0 16px 48px rgba(10,20,40,.12);

  --radius:     14px;
  --radius-sm:  9px;
  --radius-lg:  22px;

  --container:  1180px;
  --header-h:   68px;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
               Consolas, "Liberation Mono", monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: none; }
ul, ol { list-style-position: inside; }

::selection { background: rgba(0,184,217,.22); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
}
h1 { font-size: clamp(2.3rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); }
h3 { font-size: 1.28rem; }
h4 { font-size: 1.05rem; }

p { color: var(--ink-soft); }
.lead { font-size: 1.16rem; color: var(--ink-soft); }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}
.eyebrow::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--grad);
  border-radius: 2px;
}

.section { padding: 96px 0; }
.section.tight { padding: 64px 0; }
.section.soft { background: var(--bg-soft); }
.section.navy { background: var(--navy); color: #dce6f5; }
.section.navy h2, .section.navy h3, .section.navy h4 { color: #fff; }
.section.navy p { color: #b9c8dd; }

.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head .eyebrow { margin-bottom: 16px; }
.section-head h2 { margin-bottom: 16px; }
.section-head p { font-size: 1.08rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  height: var(--header-h);
}
.site-header .container {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand-mark {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--grad);
  display: grid; place-items: center;
  flex: 0 0 auto;
  box-shadow: 0 4px 14px rgba(47,107,255,.28);
}
.brand-name { font-weight: 800; letter-spacing: -.01em; font-size: 1.12rem; line-height: 1; }
.brand-sub { font-size: .66rem; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); font-weight: 600; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: .95rem;
  padding: 8px 13px;
  border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav a:hover { color: var(--ink); background: var(--bg-tint); }
.nav a.active { color: var(--blue); }
.nav-cta { margin-left: 10px; }

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  width: 40px; height: 40px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: .95rem;
  padding: 11px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s, color .15s;
  white-space: nowrap;
  font-family: inherit;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 18px rgba(47,107,255,.30); }
.btn-primary:hover { box-shadow: 0 10px 26px rgba(47,107,255,.42); transform: translateY(-1px); color: #fff; }
.btn-outline { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-outline:hover { border-color: #c6d2e2; background: var(--bg-soft); }
.btn-ghost { color: #fff; border-color: rgba(255,255,255,.28); background: rgba(255,255,255,.05); }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.5); color: #fff; }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: 12px; }
.btn .arrow { transition: transform .18s; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 600px at 85% -10%, rgba(123,108,255,.16), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(0,184,217,.16), transparent 55%),
    var(--navy);
  color: #eaf1fb;
  overflow: hidden;
}
.hero-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 0%, transparent 72%);
}
.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
  padding-top: 92px;
  padding-bottom: 92px;
}
.hero h1 { color: #fff; margin: 18px 0 20px; }
.hero .lead { color: #c2d1e6; max-width: 560px; }
.hero-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: .8rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: #9fd8ff;
  background: rgba(0,184,217,.10);
  border: 1px solid rgba(0,184,217,.30);
  padding: 7px 14px;
  border-radius: 999px;
}
.hero-actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: 52px;
  border-top: 1px solid rgba(255,255,255,.14);
  padding-top: 28px;
}
.hero-stat .num { font-size: 1.7rem; font-weight: 800; color: #fff; letter-spacing: -.02em; }
.hero-stat .num .unit { font-size: 1rem; color: #9fd8ff; font-weight: 600; }
.hero-stat .label { font-size: .82rem; color: #9fb2cc; margin-top: 2px; }

/* ---------- Cards & grids ---------- */
.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: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow .2s, transform .2s, border-color .2s;
}
.card:hover { box-shadow: var(--shadow-md); border-color: #d3ddea; transform: translateY(-2px); }
.card h3 { margin: 14px 0 10px; }
.card p { font-size: .97rem; }

.icon-chip {
  width: 46px; height: 46px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: var(--grad-soft);
  color: var(--blue);
  border: 1px solid rgba(47,107,255,.12);
}
.icon-chip svg { width: 24px; height: 24px; }

/* ---------- Split / feature ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split.flip .split-media { order: 2; }
.split-media {
  background: var(--bg-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: grid; place-items: center;
}
.split-media.navy { background: var(--navy); border-color: rgba(255,255,255,.08); }
.check-list { list-style: none; margin-top: 18px; }
.check-list li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 11px;
  color: var(--ink-soft);
}
.check-list li::before {
  content: "";
  position: absolute; left: 0; top: 6px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--grad);
}
.check-list li::after {
  content: "";
  position: absolute; left: 6px; top: 11px;
  width: 7px; height: 4px;
  border-left: 2px solid #fff; border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}

/* ---------- Spec tables ---------- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .94rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.spec-table th {
  background: var(--bg-soft);
  font-weight: 600;
  color: var(--ink);
  font-size: .8rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.spec-table td:first-child { color: var(--muted); font-weight: 500; width: 42%; }
.spec-table td:last-child { color: var(--ink-2); font-weight: 500; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
.spec-table .mono { color: var(--ink); }
.spec-note { font-size: .8rem; color: var(--muted); margin-top: 12px; }

/* ---------- Figure / diagram ---------- */
.figure {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.figure .fig-body { padding: 22px; display: grid; place-items: center; background: #fbfcfe; }
.figure .fig-cap { padding: 13px 18px; border-top: 1px solid var(--line-soft); font-size: .83rem; color: var(--muted); }

/* ---------- Pill / tag ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .76rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--bg-tint);
  color: var(--blue);
  border: 1px solid rgba(47,107,255,.16);
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- Steps / process ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
}
.step .step-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .85rem;
  color: var(--blue);
  background: var(--grad-soft);
  border: 1px solid rgba(47,107,255,.14);
  border-radius: 8px;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  margin-bottom: 14px;
}
.step h4 { margin-bottom: 8px; }
.step p { font-size: .9rem; }

/* ---------- Timeline (R&D) ---------- */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute; left: 7px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--cyan), var(--blue), var(--violet));
  border-radius: 2px;
}
.timeline-item { position: relative; padding-bottom: 34px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute; left: -28px; top: 6px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--blue);
}
.timeline-item .date { font-family: var(--font-mono); font-size: .82rem; color: var(--blue); font-weight: 600; }
.timeline-item h4 { margin: 6px 0 6px; }
.timeline-item p { font-size: .95rem; }

/* ---------- Quote / banner ---------- */
.banner {
  border-radius: var(--radius-lg);
  padding: 46px 48px;
  background:
    radial-gradient(700px 300px at 90% 0%, rgba(123,108,255,.22), transparent 60%),
    radial-gradient(500px 280px at 0% 100%, rgba(0,184,217,.20), transparent 55%),
    var(--navy);
  color: #dbe6f5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.banner h2 { color: #fff; margin-bottom: 10px; }
.banner p { color: #b9c8dd; max-width: 620px; }
.banner .banner-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Contact / forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 7px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: .86rem; font-weight: 600; color: var(--ink-2); }
.form-group label .req { color: #e0455e; }
.form-group input,
.form-group select,
.form-group textarea {
  font-family: inherit;
  font-size: .95rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(47,107,255,.14);
}
.form-group textarea { min-height: 128px; resize: vertical; }
.form-hint { font-size: .78rem; color: var(--muted); }
.form-note {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 3px solid var(--cyan);
  background: var(--bg-tint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .86rem;
  color: var(--ink-soft);
}
.form-success {
  display: none;
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: #e9fbf3;
  border: 1px solid #b6ead4;
  color: #0a7a54;
  font-weight: 500;
}
.form-success.show { display: block; }

/* ---------- Footer ---------- */
.site-footer { background: #081223; color: #9fb2cc; padding: 72px 0 36px; font-size: .92rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; }
.site-footer h5 { color: #fff; font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 16px; }
.site-footer a { color: #9fb2cc; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; }
.site-footer ul li { margin-bottom: 9px; }
.footer-brand .brand { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: .9rem; color: #8296b3; max-width: 300px; }
.footer-bottom {
  margin-top: 52px;
  padding-top: 26px;
  border-top: 1px solid rgba(255,255,255,.09);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: .82rem;
  color: #6d82a0;
}

/* ---------- Page hero (interior) ---------- */
.page-hero {
  background:
    radial-gradient(900px 420px at 88% -10%, rgba(123,108,255,.16), transparent 60%),
    radial-gradient(700px 360px at -8% 120%, rgba(0,184,217,.15), transparent 55%),
    var(--navy);
  color: #eaf1fb;
  padding: 84px 0 78px;
  position: relative;
  overflow: hidden;
}
.page-hero h1 { color: #fff; margin: 16px 0 16px; max-width: 760px; }
.page-hero .lead { color: #c2d1e6; max-width: 720px; }
.page-hero .crumb { font-size: .82rem; color: #9fb2cc; }
.page-hero .crumb a { color: #9fd8ff; }
.page-hero .crumb span { margin: 0 6px; color: #5b6b84; }

/* ---------- Product card ---------- */
.product-card { display: flex; flex-direction: column; }
.product-card .product-top {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; margin-bottom: 6px;
}
.product-card .product-name { font-size: 1.22rem; font-weight: 700; }
.product-card .product-tag { font-size: .74rem; font-weight: 600; color: var(--cyan-deep); background: rgba(0,184,217,.10); border: 1px solid rgba(0,184,217,.22); padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.product-card .product-desc { font-size: .93rem; }
.product-mini-specs { list-style: none; margin-top: 16px; border-top: 1px solid var(--line-soft); padding-top: 14px; }
.product-mini-specs li { display: flex; justify-content: space-between; gap: 12px; font-size: .86rem; padding: 5px 0; }
.product-mini-specs li span:first-child { color: var(--muted); }
.product-mini-specs li span:last-child { font-weight: 600; color: var(--ink-2); font-family: var(--font-mono); font-size: .84rem; }

/* ---------- Anchored product section ---------- */
.product-block { scroll-margin-top: 90px; }
.product-anchor-bar {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px;
  position: sticky; top: calc(var(--header-h) + 12px); z-index: 40;
}
.product-anchor-bar a {
  font-size: .88rem; font-weight: 600; color: var(--ink-soft);
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px;
}
.product-anchor-bar a:hover { border-color: var(--blue); color: var(--blue); }

/* ---------- Utility ---------- */
.mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; } .mt-48 { margin-top: 48px; }
.center { text-align: center; }
.nowrap { white-space: nowrap; }
.divider { height: 1px; background: var(--line); border: 0; margin: 0; }

/* ---------- Reveal animation (subtle) ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero .container { grid-template-columns: 1fr; padding-top: 60px; padding-bottom: 60px; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split.flip .split-media { order: 0; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 12px 20px 20px;
    box-shadow: var(--shadow-md);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .18s, transform .18s;
  }
  .nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav a { padding: 13px 10px; border-radius: 8px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-toggle { display: flex; }
}
@media (max-width: 640px) {
  .container { padding: 0 20px; }
  .section { padding: 64px 0; }
  .grid-2, .grid-3, .grid-4, .steps { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .banner { padding: 34px 26px; }
}