/* ============================================================
   AETHER.NAV — Minimal Dark Tech Navigation Hub
   Design language: Apple Developer / Linear / Vercel console
   ============================================================ */

:root {
  --bg: #030303;
  --bg-soft: #0a0a0c;
  --ink: #f5f5f7;
  --ink-dim: #86868b;
  --ink-faint: #48484a;
  --line: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --glass: rgba(12, 12, 14, 0.55);
  --glass-bd: rgba(255, 255, 255, 0.08);
  --accent: #7dd3fc;
  --accent-2: #38bdf8;
  --glow: 0 0 0 1px rgba(125, 211, 252, 0.25), 0 8px 40px -8px rgba(56, 189, 248, 0.35);
  --radius: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Helvetica Neue", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
html {
  overflow-x: clip;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(56, 189, 248, 0.06), transparent 60%),
    radial-gradient(800px 500px at 90% 10%, rgba(168, 85, 247, 0.04), transparent 60%),
    var(--bg);
}

::selection { background: rgba(125, 211, 252, 0.25); color: #fff; }

/* ==================== Flow Field Canvas ==================== */
#flowfield {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.9;
}

/* ==================== Sticky Glass Topbar ==================== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background:
    linear-gradient(180deg, rgba(3, 3, 3, 0.85) 0%, rgba(3, 3, 3, 0.55) 70%, rgba(3, 3, 3, 0) 100%);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-bottom: 1px solid var(--line);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.topbar.scrolled {
  background: linear-gradient(180deg, rgba(3, 3, 3, 0.92), rgba(3, 3, 3, 0.78));
  border-bottom-color: var(--line-strong);
}

.topbar-inner {
  max-width: 1680px;
  margin: 0 auto;
  padding: 16px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

/* ---- Brand ---- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: 0.18em;
  font-size: 14px;
  font-weight: 600;
  user-select: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(125, 211, 252, 0.12), rgba(168, 85, 247, 0.08));
  border: 1px solid var(--glass-bd);
  box-shadow: inset 0 0 12px rgba(125, 211, 252, 0.1);
  position: relative;
  overflow: hidden;
}
.brand-logo {
  width: 30px;
  height: 30px;
  display: block;
  filter: drop-shadow(0 0 4px rgba(125, 211, 252, 0.45));
  animation: logoPulse 4s ease-in-out infinite;
}
.brand-logo .logo-rect {
  transform-origin: 24px 24px;
  transition: transform 0.6s var(--ease);
}
.brand:hover .brand-logo { filter: drop-shadow(0 0 7px rgba(125, 211, 252, 0.7)); }
.brand:hover .brand-logo .logo-rect { transform: rotate(90deg); }
@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 3px rgba(125, 211, 252, 0.35)); }
  50%      { filter: drop-shadow(0 0 7px rgba(125, 211, 252, 0.7)); }
}
.brand-dot { color: var(--accent); }

/* ---- Zen Search ---- */
.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
}
.search-probe {
  position: absolute;
  left: 16px;
  color: var(--ink-faint);
  font-size: 13px;
  pointer-events: none;
  transition: color 0.3s var(--ease), transform 0.3s var(--ease);
}
#search {
  width: 100%;
  height: 42px;
  padding: 0 56px 0 42px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-size: 14px;
  font-family: inherit;
  letter-spacing: 0.02em;
  outline: none;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
#search::placeholder { color: transparent; }
#search:hover { border-color: var(--line-strong); }
#search:focus {
  border-color: rgba(125, 211, 252, 0.45);
  background: rgba(125, 211, 252, 0.04);
  box-shadow: var(--glow);
}
#search:focus ~ .search-probe,
.search-wrap:focus-within .search-probe {
  color: var(--accent);
  transform: scale(1.05);
}
.search-esc {
  position: absolute;
  right: 12px;
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--ink-dim);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  pointer-events: none;
}

/* ---- Filters ---- */
.filters {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.filter-pill {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--ink-dim);
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s var(--ease);
  white-space: nowrap;
}
.filter-pill:hover {
  color: var(--ink);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
}
.filter-pill.active {
  color: #030303;
  background: var(--ink);
  border-color: var(--ink);
  font-weight: 600;
}

/* ==================== Stage ==================== */
.stage {
  max-width: 1680px;
  margin: 0 auto;
  padding: 48px 28px 80px;
}

.group { margin-bottom: 56px; }
.group[data-hidden="true"] { display: none; }

.group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 18px 4px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.group-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
}
.group-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line-strong), transparent);
}

/* ==================== Launchpad Grid ==================== */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
}
@media (min-width: 380px) { .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 640px) { .grid { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
@media (min-width: 1280px) { .grid { grid-template-columns: repeat(7, minmax(0, 1fr)); } }
@media (min-width: 1536px) { .grid { grid-template-columns: repeat(8, minmax(0, 1fr)); } }
@media (min-width: 1920px) { .grid { grid-template-columns: repeat(10, minmax(0, 1fr)); } }

/* ---- Card (icon-top / text-bottom, perfect axis symmetry) ---- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 22px 10px 18px;
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
  will-change: transform;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-2px);
}
.card:hover::before {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.025);
}
.card:hover .card-icon {
  color: var(--accent);
  box-shadow: 0 8px 28px -10px rgba(56, 189, 248, 0.5),
              inset 0 0 18px rgba(125, 211, 252, 0.18);
  border-color: rgba(125, 211, 252, 0.35);
}
.card:active { transform: translateY(0); }

.card-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 18px;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.card-name {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-align: center;
  line-height: 1.3;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---- search match highlight ---- */
.search-match {
  color: var(--accent);
  background: rgba(125, 211, 252, 0.12);
  border-radius: 3px;
  padding: 0 2px;
}
.card.dimmed {
  opacity: 0.25;
  filter: grayscale(0.4);
}
.card.dimmed::before { border-color: transparent; }

/* ==================== Empty State ==================== */
.empty {
  text-align: center;
  padding: 120px 20px;
  color: var(--ink-faint);
}
.empty i { font-size: 36px; margin-bottom: 16px; color: var(--ink-faint); }
.empty p { font-size: 13px; letter-spacing: 0.1em; margin: 0; }

/* ==================== Footer ==================== */
.foot {
  text-align: center;
  padding: 32px 20px 48px;
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}
.foot-dot { margin: 0 10px; opacity: 0.5; }

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.08); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.16); }

/* ==================== Reveal Animation ==================== */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ==================== Responsive Tuning ==================== */
@media (max-width: 860px) {
  .topbar-inner { padding: 12px 18px; gap: 12px; }
  .stage { padding: 28px 18px 60px; }
}

/* ---- Mobile compact: denser cards, shorter topbar, horizontal filter scroll ---- */
@media (max-width: 640px) {
  /* Topbar: shrink brand + search to reclaim vertical space */
  .topbar-inner { padding: 9px 14px; gap: 9px; }
  .brand { font-size: 12px; gap: 8px; letter-spacing: 0.12em; }
  .brand-mark { width: 30px; height: 30px; border-radius: 8px; }
  .brand-logo { width: 24px; height: 24px; }
  #search { height: 38px; font-size: 13px; padding: 0 42px 0 38px; }
  .search-probe { left: 14px; font-size: 12px; }
  .search-esc { display: none; } /* no ESC key on mobile, free up input width */

  /* Filters: horizontal scroll instead of wrapping rows */
  .filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    justify-content: flex-start;
    gap: 6px;
    width: 100%;
    max-width: 100vw;
    padding-bottom: 2px;
  }
  .filters::-webkit-scrollbar { display: none; }
  .filter-pill { padding: 6px 10px; font-size: 11px; flex-shrink: 0; }

  /* Stage + group spacing compaction */
  .stage { padding: 20px 12px 44px; }
  .group { margin-bottom: 34px; }
  .group-head { margin: 0 0 12px 2px; padding-bottom: 8px; gap: 10px; }
  .group-title { font-size: 12px; letter-spacing: 0.18em; }

  /* Denser cards */
  .grid { gap: 3px; }
  .card { padding: 14px 4px 12px; gap: 7px; border-radius: 11px; }
  .card-icon { width: 36px; height: 36px; font-size: 15px; border-radius: 10px; }
  .card-name { font-size: 11px; line-height: 1.25; }

  /* Footer */
  .foot { padding: 22px 16px 32px; font-size: 10px; letter-spacing: 0.18em; }
}

/* ---- Ultra-small phones (≤360px): push density without cramping ---- */
@media (max-width: 360px) {
  .topbar-inner { padding: 8px 12px; gap: 8px; }
  .stage { padding: 18px 10px 40px; }
  .card { padding: 12px 3px 10px; gap: 6px; }
  .card-icon { width: 32px; height: 32px; font-size: 14px; }
  .card-name { font-size: 10.5px; }
  .filter-pill { padding: 5px 9px; font-size: 10.5px; }
}

/* ==================== Reduced Motion ==================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  #flowfield { display: none; }
}