/* ============================================================
   skknexus — Product Vitrine
   Light-first, premium, portfolio-ready.
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ---------- Tokens ---------- */
:root {
  --paper:       #F4F6F8;
  --surface:     #FFFFFF;
  --surface-2:   #FAFBFC;
  --ink:         #14161B;
  --ink-soft:    #414755;
  --muted:       #6C7280;
  --hair:        #E4E7EC;
  --hair-2:      #EEF0F4;

  --accent:      #2F4A7A;   /* graphite blue — chosen, not defaulted */
  --accent-ink:  #FFFFFF;
  --app-accent:  var(--accent);      /* overridden per product */
  --app-accent-2: var(--accent);

  --font-display: 'Bricolage Grotesque', 'Inter', sans-serif;
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --shadow-sm: 0 2px 8px rgba(20, 30, 60, .06);
  --shadow-md: 0 12px 30px -10px rgba(20, 30, 60, .16);
  --shadow-lg: 0 30px 60px -18px rgba(20, 30, 60, .28);

  --ease: cubic-bezier(.2, .7, .2, 1);
  --t: .22s var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:     #0B0C10;
    --surface:   #14161C;
    --surface-2: #101218;
    --ink:       #EEF0F4;
    --ink-soft:  #C4C9D3;
    --muted:     #868C9C;
    --hair:      #242833;
    --hair-2:    #1B1E27;

    --accent:    #7FA3E0;
    --accent-ink:#0B0C10;

    --shadow-sm: 0 2px 8px rgba(0,0,0,.4);
    --shadow-md: 0 12px 30px -10px rgba(0,0,0,.55);
    --shadow-lg: 0 30px 60px -18px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"] {
  --paper:#0B0C10; --surface:#14161C; --surface-2:#101218;
  --ink:#EEF0F4; --ink-soft:#C4C9D3; --muted:#868C9C;
  --hair:#242833; --hair-2:#1B1E27;
  --accent:#7FA3E0; --accent-ink:#0B0C10;
  --shadow-sm:0 2px 8px rgba(0,0,0,.4);
  --shadow-md:0 12px 30px -10px rgba(0,0,0,.55);
  --shadow-lg:0 30px 60px -18px rgba(0,0,0,.7);
}

/* ---------- Base ---------- */
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

::selection { background: color-mix(in srgb, var(--accent) 26%, transparent); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--ink) 16%, transparent); border-radius: 6px; border: 2px solid var(--paper); }
::-webkit-scrollbar-thumb:hover { background: color-mix(in srgb, var(--ink) 30%, transparent); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 28px; }

/* ---------- Header ---------- */
.minimal-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--hair);
}
.minimal-header .header-container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 16px 28px; max-width: 1120px; margin: 0 auto;
}
.logo {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; font-family: var(--font-display);
  font-size: 21px; font-weight: 800; letter-spacing: -.02em; color: var(--ink);
}
.logo-glow { color: var(--ink); background: none; -webkit-text-fill-color: currentColor; }
.logo-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: none;
}
.minimal-nav { display: flex; align-items: center; gap: 8px; }
.minimal-nav a {
  color: var(--muted); text-decoration: none;
  font-size: 14px; font-weight: 500; letter-spacing: 0;
  text-transform: none; padding: 8px 12px; border-radius: 8px;
  transition: color var(--t), background var(--t);
}
.minimal-nav a:hover { color: var(--ink); background: var(--hair-2); }
.minimal-nav a.active { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  padding: clamp(64px, 12vw, 128px) 0 clamp(32px, 5vw, 56px);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: -40% 0 auto 0; height: 620px;
  background:
    radial-gradient(60% 60% at 78% 8%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
    radial-gradient(50% 50% at 12% 0%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%);
  pointer-events: none; z-index: 0;
}
.hero .container { position: relative; z-index: 1; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  padding: 7px 14px; border-radius: 30px; margin-bottom: 26px;
}
.hero-eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.hero h1 {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(38px, 6.4vw, 72px); line-height: 1.02; letter-spacing: -.025em;
  max-width: 16ch; text-wrap: balance; margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero-lede {
  font-size: clamp(17px, 2.1vw, 20px); color: var(--ink-soft);
  max-width: 56ch; line-height: 1.55;
}
.hero-stats {
  display: flex; flex-wrap: wrap; gap: 40px; margin-top: 44px;
  padding-top: 30px; border-top: 1px solid var(--hair);
}
.hero-stat .num {
  font-family: var(--font-display); font-weight: 800; font-size: 30px;
  letter-spacing: -.02em; color: var(--ink);
}
.hero-stat .lbl {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); margin-top: 4px;
}

/* ---------- Portfolio section ---------- */
.apps-section { flex: 1; padding: clamp(20px, 4vw, 40px) 0 clamp(64px, 10vw, 120px); }
.section-label {
  display: flex; align-items: baseline; gap: 14px; margin-bottom: 8px;
}
.section-label .idx { font-family: var(--font-mono); font-size: 13px; color: var(--accent); font-weight: 500; }
.section-label h2 {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -.015em;
}
.section-note { color: var(--muted); font-size: 15px; margin: 0 0 8px 0; max-width: 60ch; }

.apps-grid { display: flex; flex-direction: column; gap: clamp(28px, 5vw, 56px); margin-top: clamp(28px, 5vw, 52px); }

/* Group header (appears once ≥2 product types exist) */
.group-head {
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
  padding-bottom: 14px; border-bottom: 1px solid var(--hair);
  margin-top: clamp(12px, 3vw, 28px);
}
.group-head:first-child { margin-top: 0; }
.group-head h3 {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(19px, 2.4vw, 24px);
  letter-spacing: -.01em; color: var(--ink);
}
.group-head .group-note { color: var(--muted); font-size: 14px; }

/* ---------- Product card ---------- */
.app-card {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 44px);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--t), transform var(--t), border-color var(--t);
}
.app-card:hover { box-shadow: var(--shadow-md); border-color: var(--hair); transform: translateY(-2px); }

.app-info-block {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}
.app-card.reverse .app-info-block { grid-template-columns: 1fr 1.1fr; }
.app-card.reverse .app-media { order: -1; }

/* content column */
.app-details { min-width: 0; }
.app-eyebrow {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 18px;
}
.app-lockup { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.app-icon {
  width: 62px; height: 62px; border-radius: 15px; flex-shrink: 0;
  background: var(--surface-2); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--hair);
}
.app-icon img { width: 100%; height: 100%; object-fit: cover; display: block; }
.app-title-group h2 {
  font-family: var(--font-display); font-weight: 800; font-size: clamp(24px, 3.4vw, 34px);
  letter-spacing: -.02em; line-height: 1.05; color: var(--ink);
}
.app-category {
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: .1em; text-transform: uppercase; color: var(--app-accent); margin-top: 6px;
}
.platform-tags { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 16px; }
.platform-tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted);
  background: var(--hair-2); border: 1px solid var(--hair);
  padding: 4px 9px; border-radius: 6px;
}
.app-description {
  color: var(--ink-soft); font-size: clamp(15px, 1.6vw, 16.5px); line-height: 1.65;
  max-width: 46ch; margin-bottom: 22px;
}
.app-highlights {
  list-style: none; display: flex; flex-direction: column; gap: 11px;
  margin: 0 0 28px 0; max-width: 46ch;
}
.app-highlights li {
  display: flex; align-items: flex-start; gap: 11px;
  font-size: 14.5px; line-height: 1.45; color: var(--ink-soft);
}
.app-highlights svg {
  width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px;
  color: var(--app-accent);
  padding: 3px; border-radius: 50%;
  background: color-mix(in srgb, var(--app-accent) 12%, transparent);
}
.app-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* media column */
.app-media { display: flex; align-items: center; justify-content: center; min-width: 0; }

/* screenshots as device frames */
.shots {
  display: flex; gap: 16px; justify-content: center; align-items: flex-end; width: 100%;
}
.device {
  flex: 0 1 188px; max-width: 194px; aspect-ratio: 9 / 19.5;
  border-radius: 30px; padding: 8px;
  background: linear-gradient(160deg, #2a2d38, #14161b);
  box-shadow: var(--shadow-lg);
  position: relative;
}
.device::before {
  content: ""; position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  width: 42px; height: 5px; border-radius: 3px; background: rgba(255,255,255,.22); z-index: 2;
}
.device .screen {
  width: 100%; height: 100%; border-radius: 23px; overflow: hidden; background: #0c0d11;
}
.device .screen img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* icon showcase fallback (no screenshots yet) */
.showcase {
  width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(120% 120% at 50% 0%, color-mix(in srgb, var(--app-accent) 24%, transparent), transparent 62%),
    var(--surface-2);
  border: 1px solid var(--hair); overflow: hidden; position: relative;
}
.showcase::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(60% 60% at 50% 120%, color-mix(in srgb, var(--app-accent) 18%, transparent), transparent 70%);
}
.showcase .big-icon {
  width: clamp(96px, 22%, 132px); aspect-ratio: 1; border-radius: 26px;
  box-shadow: var(--shadow-lg); overflow: hidden; position: relative; z-index: 1;
  border: 1px solid rgba(255,255,255,.14);
}
.showcase .big-icon img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 22px; border-radius: 12px; font-size: 14.5px; font-weight: 600;
  font-family: var(--font-sans); text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: transform var(--t), box-shadow var(--t), background var(--t), border-color var(--t);
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: var(--app-accent); color: #fff;
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--app-accent) 70%, transparent);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 22px -8px color-mix(in srgb, var(--app-accent) 80%, transparent); }
.btn-secondary {
  background: var(--surface); color: var(--ink); border-color: var(--hair);
}
.btn-secondary:hover { border-color: color-mix(in srgb, var(--ink) 24%, transparent); background: var(--surface-2); }
/* legacy alias kept so JS accentClass values never break styling */
.btn-mathscans { background: var(--app-accent); color: #fff; }

/* ---------- Loading ---------- */
.loading-state {
  text-align: center; color: var(--muted); padding: 60px 0;
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .04em;
}

/* ---------- Legal pages ---------- */
.legal-container { max-width: 760px; margin: clamp(48px, 8vw, 88px) auto; padding: 0 28px; flex: 1; }
.legal-header { margin-bottom: 40px; padding-bottom: 28px; border-bottom: 1px solid var(--hair); }
.legal-header h1 {
  font-family: var(--font-display); font-size: clamp(30px, 5vw, 44px); font-weight: 800;
  letter-spacing: -.02em; margin-bottom: 10px;
}
.effective-date { color: var(--muted); font-family: var(--font-mono); font-size: 13px; }
.legal-content { color: var(--ink-soft); font-size: 15.5px; line-height: 1.8; }
.legal-content p { margin-bottom: 22px; }
.legal-content h2 {
  font-family: var(--font-display); font-size: 21px; font-weight: 700; color: var(--ink);
  margin-top: 42px; margin-bottom: 12px; letter-spacing: -.01em;
}
.legal-content ul { margin-bottom: 22px; padding-left: 22px; }
.legal-content li { margin-bottom: 8px; }
.legal-content strong { color: var(--ink); font-weight: 600; }
.legal-content a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.legal-content a:hover { border-bottom-color: var(--accent); }

/* ---------- Footer ---------- */
footer { border-top: 1px solid var(--hair); background: var(--surface); margin-top: auto; }
.footer-container {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px;
  padding: 36px 28px; max-width: 1120px; margin: 0 auto;
}
.footer-logo {
  text-decoration: none; font-family: var(--font-display); font-weight: 800; font-size: 17px;
  color: var(--ink); display: inline-flex; align-items: center; gap: 8px;
}
.footer-links { display: flex; gap: 22px; }
.footer-links a {
  color: var(--muted); text-decoration: none; font-size: 14px; transition: color var(--t);
}
.footer-links a:hover { color: var(--ink); }
.copyright { color: var(--muted); font-size: 13px; font-family: var(--font-mono); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in { opacity: 1; transform: none; transition: opacity .7s var(--ease), transform .7s var(--ease); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .app-info-block, .app-card.reverse .app-info-block { grid-template-columns: 1fr; gap: 32px; }
  .app-card.reverse .app-media { order: 0; }
  .app-media { order: -1; }
}
@media (max-width: 560px) {
  .minimal-nav a { padding: 8px 8px; font-size: 13.5px; }
  .footer-container { flex-direction: column; text-align: center; }
  .shots { gap: 12px; }
  .hero-stats { gap: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}