/* ═════════════════════════════════════════════════════
   unoco · design system
   palette: aliceblue + white + cyan #21bcf3
   font   : Quicksand
   ═════════════════════════════════════════════════════ */

:root {
  --bg: #f0f8ff;          /* aliceblue */
  --bg-alt: #ffffff;
  --primary: #21bcf3;
  --primary-strong: #0a9ad6;
  --primary-soft: rgba(33, 188, 243, 0.10);
  --primary-soft-2: rgba(33, 188, 243, 0.18);
  --visited: #9999cd;
  --text: #0e1f2e;
  --text-secondary: #4a5b6c;
  --text-muted: #8294a3;
  --line: rgba(33, 188, 243, 0.14);

  --radius-pill: 999px;
  --radius-lg: 1.5rem;
  --radius: 1rem;
  --radius-sm: 0.5rem;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 7rem;

  --shadow-sm: 0 1px 2px rgba(15, 60, 100, 0.05);
  --shadow: 0 2px 6px rgba(15, 60, 100, 0.06), 0 12px 28px rgba(15, 60, 100, 0.07);
  --shadow-hover: 0 4px 10px rgba(15, 60, 100, 0.08), 0 24px 48px rgba(33, 188, 243, 0.16);

  --t: 200ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Quicksand', 'STSong', system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--t);
}
a:hover { color: var(--primary-strong); }

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
}

p { margin: 0 0 var(--space-sm); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ───── Eyebrow / section heads ───── */
.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--primary);
  margin: 0 0 var(--space-sm) 0;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-xl) auto;
}
.section-head h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 700;
}
.section-head .section-lede {
  margin: var(--space-md) auto 0;
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* ───── Header ───── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: var(--space-md) 0;
  background: rgba(240, 248, 255, 0.78);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--primary-strong); }
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.95rem;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--text-secondary);
  position: relative;
  padding: 0.25rem 0;
}
.site-nav a:hover { color: var(--primary); }
.site-nav a:not(.btn)::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t);
}
.site-nav a:not(.btn):hover::after { transform: scaleX(1); }

/* ───── Buttons ───── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-pill);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--t), color var(--t), border-color var(--t), transform var(--t), box-shadow var(--t);
}
.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(33, 188, 243, 0.32);
}
.btn-primary:hover {
  background: var(--primary-strong);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(33, 188, 243, 0.42);
}
.btn-ghost {
  background: transparent;
  color: var(--primary);
  border-color: rgba(33, 188, 243, 0.4);
}
.btn-ghost:hover {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-strong);
}
.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
}

.link-arrow {
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: gap var(--t), color var(--t);
}
.link-arrow:hover { gap: 0.55rem; }

/* ───── Section primitive ───── */
.section {
  padding: var(--space-3xl) 0;
}
.section--white {
  background: var(--bg-alt);
}
.section--alt {
  background: var(--bg);
}

@media (max-width: 720px) {
  .section { padding: var(--space-2xl) 0; }
}

/* ───── Hero ───── */
.hero {
  position: relative;
  min-height: calc(100vh - 4rem);
  min-height: calc(100svh - 4rem);
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(180deg, #f0f8ff 0%, #ffffff 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 18% 22%, rgba(33, 188, 243, 0.30) 0%, transparent 45%),
    radial-gradient(circle at 82% 70%, rgba(154, 200, 245, 0.32) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(255, 220, 130, 0.22) 0%, transparent 55%);
  filter: blur(8px);
}
.hero-inner {
  position: relative;
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin: 0 auto var(--space-lg);
  max-width: 900px;
}
.hero-lede {
  margin: 0 auto var(--space-xl);
  max-width: 640px;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.6;
}
.hero-ctas {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 44px;
  border: 2px solid rgba(33, 188, 243, 0.35);
  border-radius: 14px;
  display: flex;
  justify-content: center;
}
.hero-scroll span {
  width: 4px;
  height: 8px;
  background: var(--primary);
  border-radius: 2px;
  margin-top: 8px;
  animation: scrollHint 1.6s ease-in-out infinite;
}
@keyframes scrollHint {
  0%   { transform: translateY(0);    opacity: 1; }
  60%  { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0);    opacity: 0; }
}

/* ───── 3-up tile grid ───── */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}
@media (min-width: 720px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}
.tile {
  background: var(--bg);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t), background var(--t);
}
.tile:hover {
  transform: translateY(-4px);
  background: #ffffff;
  border-color: var(--line);
  box-shadow: var(--shadow-hover);
}
.tile-emoji {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: var(--radius-pill);
  background: var(--primary-soft);
  font-size: 1.75rem;
  margin-bottom: var(--space-md);
}
.tile h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--primary);
}
.tile-tag {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  margin: 0 0 var(--space-md);
}
.tile p { color: var(--text-secondary); margin: 0 0 var(--space-md); }

/* ───── Feature row (image + text) ───── */
.feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
}
@media (min-width: 860px) {
  .feature {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }
  .feature--reverse .feature-image { order: 2; }
}
.feature-text h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
}
.feature-text p { color: var(--text-secondary); }
.feature-image {
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--t), box-shadow var(--t);
}
.feature-image:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.feature-image img {
  width: 100%;
  border-radius: var(--radius-lg);
}
.feature-image.stack {
  display: grid;
  gap: var(--space-md);
  background: none;
}
.feature-image.stack a {
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--t);
}
.feature-image.stack a:hover { transform: translateY(-3px); }

/* ───── Reasons list ───── */
.reasons {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0 var(--space-lg);
}
.reasons li {
  position: relative;
  padding: var(--space-sm) 0 var(--space-sm) 1.75rem;
  border-bottom: 1px solid var(--line);
  color: var(--text-secondary);
}
.reasons li:last-child { border-bottom: none; }
.reasons li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 1.4rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft);
}
.reasons b { color: var(--text); font-weight: 700; }
.reasons i { font-style: italic; }

/* ───── Applications grid ───── */
.applications {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
@media (min-width: 600px)  { .applications { grid-template-columns: repeat(4, 1fr); } }
.applications li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-sm);
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
  transition: background var(--t), transform var(--t);
}
.applications li:hover {
  background: var(--primary-soft);
  transform: translateY(-2px);
}
.app-emoji {
  font-size: 2rem;
  display: inline-flex;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-pill);
  background: #ffffff;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}
.applications span:last-child {
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

/* ───── Network grid ───── */
.sites {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-sm);
}
@media (min-width: 600px) { .sites { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .sites { grid-template-columns: repeat(4, 1fr); } }
.sites a {
  display: block;
  height: 100%;
  padding: var(--space-md);
  border-radius: var(--radius);
  background: var(--bg-alt);
  border: 1px solid transparent;
  transition: background var(--t), transform var(--t), border-color var(--t), box-shadow var(--t);
}
.sites a:hover {
  border-color: var(--primary-soft-2);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.sites b {
  display: block;
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.2rem;
}
.sites span {
  display: block;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.4;
}
.sites .current a {
  background: var(--primary-soft);
  border-color: var(--primary-soft-2);
  position: relative;
}
.sites .current a::before {
  content: 'you are here';
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  background: #ffffff;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

/* ───── NSF strip ───── */
.strip {
  background: var(--bg-alt);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--line);
}
.strip-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.strip-inner img {
  height: 2.5rem;
  width: auto;
  transition: transform var(--t);
}
.strip-inner a:hover img { transform: scale(1.05); }

/* ───── Footer ───── */
.site-footer {
  background: var(--bg-alt);
  padding: var(--space-2xl) 0 var(--space-lg);
  border-top: 1px solid var(--line);
  color: var(--text-secondary);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
}
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; gap: var(--space-2xl); }
}
.footer-tag {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: var(--space-sm);
  max-width: 28em;
}
.site-footer h4 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}
.footer-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.footer-list a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}
.footer-list a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-bottom p { margin: 0; }

/* ───── Reasons variants ───── */
.reasons--centered {
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ───── Applications: secondary line ───── */
.applications small {
  display: block;
  font-weight: 500;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ───── Stats row ───── */
.market-summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin: 0 0 var(--space-2xl) 0;
}
@media (min-width: 720px) {
  .market-summary { grid-template-columns: repeat(3, 1fr); }
}
.stat {
  background: var(--bg);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  text-align: center;
  border: 1px solid transparent;
  transition: border-color var(--t), transform var(--t);
}
.stat:hover {
  border-color: var(--primary-soft-2);
  transform: translateY(-2px);
}
.stat-num {
  display: block;
  font-size: clamp(2.2rem, 4.5vw, 3rem);
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-num small {
  font-size: 0.55em;
  font-weight: 600;
  color: var(--primary-strong);
  margin-left: 0.1em;
}
.stat-label {
  display: block;
  margin-top: var(--space-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

/* ───── Data table ───── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-alt);
  -webkit-overflow-scrolling: touch;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.data-table thead th {
  background: var(--primary-soft);
  color: var(--text);
  font-weight: 700;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--primary-soft-2);
  white-space: nowrap;
}
.data-table tbody td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--line);
  color: var(--text-secondary);
}
.data-table tbody td:first-child {
  color: var(--text);
  font-weight: 600;
}
.data-table tbody td:not(:first-child) {
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: var(--primary-soft); }

/* ───── Reduced motion ───── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}