/* ============================================================================
   SWIMSTREAM — Design System
   Strict token layer. Tailwind (CDN or compiled) handles layout utilities;
   this file owns color tokens, typography, components, motion and effects.
   Dark-first. Light mode flips via [data-theme="light"].
   ========================================================================== */

/* ----------------------------------------------------------------------------
   1. TOKENS — DARK (default)
   -------------------------------------------------------------------------- */
:root {
  /* Surfaces (deep blue-black -> elevated) */
  --bg:            #070A12;
  --bg-2:          #090D17;
  --surface:       #0C111C;
  --card:          #0F1626;
  --card-2:        #121B2E;
  --elevated:      #16203A;

  /* Borders / hairlines */
  --border:        #1B2740;
  --border-2:      #26334F;
  --border-glow:   rgba(99,102,241,.45);

  /* Text */
  --ink:           #E9EEF9;
  --ink-strong:    #FFFFFF;
  --muted:         #93A0B8;
  --faint:         #5C6B86;

  /* Brand accents — indigo + cyan, calm emerald for grounding */
  --primary:       #6366F1;
  --primary-2:     #818CF8;
  --primary-ink:   #FFFFFF;
  --accent:        #22D3EE;
  --accent-2:      #67E8F9;
  --emerald:       #34D399;

  /* Semantic */
  --success:       #34D399;
  --info:          #22D3EE;
  --warning:       #FBBF24;
  --error:         #F87171;

  /* Translucent fills */
  --glass:         rgba(18, 26, 46, .55);
  --glass-2:       rgba(13, 19, 34, .72);
  --wash:          rgba(255,255,255,.025);
  --hairline:      rgba(255,255,255,.06);

  /* Radius — uniform system */
  --r-xs: 6px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 18px;
  --r-xl: 24px;
  --r-2xl: 30px;
  --r-pill: 999px;

  /* Shadows / glow */
  --shadow-sm: 0 1px 0 rgba(255,255,255,.04) inset, 0 8px 20px -14px rgba(0,0,0,.8);
  --shadow-md: 0 1px 0 rgba(255,255,255,.05) inset, 0 24px 48px -28px rgba(0,0,0,.85);
  --shadow-lg: 0 1px 0 rgba(255,255,255,.06) inset, 0 40px 80px -36px rgba(0,0,0,.9);
  --glow-primary: 0 0 0 1px rgba(99,102,241,.35), 0 18px 50px -18px rgba(99,102,241,.55);
  --glow-accent:  0 0 0 1px rgba(34,211,238,.30), 0 18px 50px -18px rgba(34,211,238,.45);

  /* Motion */
  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
  --t-fast: .15s;
  --t: .28s;
  --t-slow: .5s;

  /* Layout */
  --maxw: 1200px;
  --gutter: clamp(20px, 5vw, 56px);

  color-scheme: dark;
}

/* ----------------------------------------------------------------------------
   2. TOKENS — LIGHT
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --bg:            #F6F8FC;
  --bg-2:          #EFF3F9;
  --surface:       #FFFFFF;
  --card:          #FFFFFF;
  --card-2:        #F7FAFE;
  --elevated:      #FFFFFF;

  --border:        #E3E9F2;
  --border-2:      #D2DCEA;
  --border-glow:   rgba(79,70,229,.35);

  --ink:           #121A2B;
  --ink-strong:    #060B16;
  --muted:         #51607A;
  --faint:         #8593AC;

  --primary:       #4F46E5;
  --primary-2:     #6366F1;
  --primary-ink:   #FFFFFF;
  --accent:        #0891B2;
  --accent-2:      #06B6D4;
  --emerald:       #059669;

  --success:       #059669;
  --info:          #0891B2;
  --warning:       #B45309;
  --error:         #DC2626;

  --glass:         rgba(255,255,255,.72);
  --glass-2:       rgba(247,250,254,.8);
  --wash:          rgba(15,22,38,.02);
  --hairline:      rgba(15,22,38,.06);

  --shadow-sm: 0 1px 0 rgba(255,255,255,.7) inset, 0 8px 20px -16px rgba(31,41,72,.45);
  --shadow-md: 0 1px 0 rgba(255,255,255,.8) inset, 0 24px 48px -30px rgba(31,41,72,.4);
  --shadow-lg: 0 1px 0 rgba(255,255,255,.9) inset, 0 40px 80px -40px rgba(31,41,72,.45);
  --glow-primary: 0 0 0 1px rgba(79,70,229,.28), 0 18px 50px -22px rgba(79,70,229,.4);
  --glow-accent:  0 0 0 1px rgba(8,145,178,.26), 0 18px 50px -22px rgba(8,145,178,.35);

  color-scheme: light;
}

/* ----------------------------------------------------------------------------
   3. BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
  overflow-x: hidden;
}

/* Ambient page wash — soft luminous fields, calm not loud */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 50% at 18% -5%, rgba(99,102,241,.16), transparent 70%),
    radial-gradient(55% 45% at 92% 8%, rgba(34,211,238,.12), transparent 70%),
    radial-gradient(70% 60% at 50% 120%, rgba(52,211,153,.07), transparent 70%);
  transition: opacity var(--t) var(--ease);
}
[data-theme="light"] body::before { opacity: .55; }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--ink-strong);
  margin: 0;
  text-wrap: balance;
}
p { margin: 0; text-wrap: pretty; }
a { color: inherit; text-decoration: none; }

::selection { background: rgba(99,102,241,.32); color: var(--ink-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

.mono { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace; }

/* ----------------------------------------------------------------------------
   4. LAYOUT HELPERS
   -------------------------------------------------------------------------- */
.shell { position: relative; z-index: 1; }
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(64px, 9vw, 130px); position: relative; }
.section--tight { padding-block: clamp(48px, 6vw, 80px); }

/* Eyebrow / kicker */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent));
}

.section-title {
  font-size: clamp(1.9rem, 3.6vw, 3rem);
  margin-top: 18px;
}
.section-lead {
  color: var(--muted);
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  max-width: 60ch;
  margin-top: 16px;
}

/* ----------------------------------------------------------------------------
   5. CARDS / SURFACES / GLASS
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  background:
    linear-gradient(180deg, var(--wash), transparent 38%),
    var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--t) var(--ease), border-color var(--t) var(--ease),
              box-shadow var(--t) var(--ease), background var(--t) var(--ease);
}
.card--glass {
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
}
.card--hover:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--glow-primary);
}
/* animated top hairline on hover */
.card--beam::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  border-radius: inherit;
  background: linear-gradient(90deg, transparent, var(--primary-2), var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--t) var(--ease);
}
.card--beam:hover::after { opacity: .9; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
}

/* fine dotted grid background for terminal-ish panels */
.grid-bg {
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 28px 28px;
}

/* ----------------------------------------------------------------------------
   6. BADGES / CHIPS / PILLS
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .38em .8em;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem;
  letter-spacing: .04em;
  color: var(--muted);
  background: var(--wash);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease),
              background var(--t) var(--ease);
}
.badge--dot::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.badge--live::before { background: var(--emerald); box-shadow: 0 0 8px var(--emerald);
  animation: pulse 2.4s var(--ease) infinite; }
.badge:hover { color: var(--ink); border-color: var(--border-2); }

.chip {
  display: inline-flex; align-items: center; gap: .4em;
  padding: .42em .72em;
  font-size: .8rem;
  color: var(--ink);
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  transition: all var(--t) var(--ease);
}
.chip:hover { border-color: var(--primary); color: var(--ink-strong);
  box-shadow: 0 0 0 1px var(--primary) inset; transform: translateY(-1px); }

/* citation source chip */
.cite {
  display: inline-flex; align-items: center; gap: .4em;
  padding: .24em .6em;
  font-family: 'JetBrains Mono', monospace;
  font-size: .68rem;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 30%, transparent);
  border-radius: var(--r-pill);
}
.cite::before { content: "¶"; opacity: .7; }

/* ----------------------------------------------------------------------------
   7. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  --btn-h: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  height: var(--btn-h);
  padding-inline: 1.25rem;
  font-family: inherit;
  font-size: .95rem;
  font-weight: 500;
  letter-spacing: -.01em;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t) var(--ease),
              background var(--t) var(--ease), border-color var(--t) var(--ease),
              color var(--t) var(--ease), opacity var(--t) var(--ease);
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn svg { width: 1.1em; height: 1.1em; }

.btn--primary {
  color: var(--primary-ink);
  background: linear-gradient(135deg, var(--primary), color-mix(in oklab, var(--accent) 55%, var(--primary)));
  box-shadow: var(--shadow-sm), 0 0 0 1px rgba(255,255,255,.06) inset;
}
.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--glow-primary);
}
.btn--ghost {
  color: var(--ink);
  background: var(--wash);
  border-color: var(--border-2);
}
.btn--ghost:hover {
  border-color: var(--primary);
  color: var(--ink-strong);
  box-shadow: 0 0 0 1px var(--primary) inset, var(--glow-primary);
  transform: translateY(-1px);
}
.btn--sm { --btn-h: 38px; font-size: .85rem; padding-inline: .9rem; }
.btn--lg { --btn-h: 54px; font-size: 1.02rem; padding-inline: 1.6rem; }
.btn--icon { width: var(--btn-h); padding: 0; }
.btn--block { width: 100%; }

/* ----------------------------------------------------------------------------
   8. FORM CONTROLS
   -------------------------------------------------------------------------- */
.field { display: flex; flex-direction: column; gap: .5rem; }
.label {
  font-size: .82rem; font-weight: 500; color: var(--ink);
  display: flex; align-items: center; gap: .5em;
}
.label .hint { color: var(--faint); font-weight: 400; font-size: .78rem; }
.input, .textarea, .select {
  width: 100%;
  font-family: inherit;
  font-size: .95rem;
  color: var(--ink);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: .8rem .95rem;
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
              background var(--t) var(--ease);
}
.input::placeholder, .textarea::placeholder { color: var(--faint); }
.input:hover, .textarea:hover, .select:hover { border-color: var(--border-2); }
.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--primary) 22%, transparent);
  background: var(--surface);
}
.textarea { resize: vertical; min-height: 96px; line-height: 1.55; }
.field--error .input, .field--error .textarea, .field--error .select {
  border-color: var(--error);
}
.field-msg { font-size: .76rem; color: var(--error); min-height: 1em;
  opacity: 0; transform: translateY(-3px); transition: all var(--t) var(--ease); }
.field--error .field-msg { opacity: 1; transform: none; }

/* ----------------------------------------------------------------------------
   9. TABS
   -------------------------------------------------------------------------- */
.tabs { display: inline-flex; gap: 4px; padding: 4px;
  background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-pill); }
.tab {
  appearance: none; border: 0; cursor: pointer;
  font-family: inherit; font-size: .82rem; font-weight: 500;
  color: var(--muted);
  padding: .5em 1em;
  border-radius: var(--r-pill);
  background: transparent;
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
}
.tab[aria-selected="true"] {
  color: var(--ink-strong);
  background: var(--card-2);
  box-shadow: var(--shadow-sm);
}
.tab:hover:not([aria-selected="true"]) { color: var(--ink); }

/* ----------------------------------------------------------------------------
   10. CODE / TERMINAL / JSON PANELS
   -------------------------------------------------------------------------- */
.term {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.term__bar {
  display: flex; align-items: center; gap: .6em;
  padding: .6rem .85rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.term__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border-2); }
.term__title { margin-left: .4em; font-family: 'JetBrains Mono', monospace;
  font-size: .74rem; color: var(--faint); }
.term__body {
  font-family: 'JetBrains Mono', monospace;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--ink);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}
.tok-key { color: var(--accent); }
.tok-str { color: var(--emerald); }
.tok-num { color: var(--primary-2); }
.tok-bool { color: #f0a5d0; }
.tok-punc { color: var(--faint); }
.tok-com { color: var(--faint); font-style: italic; }
.tok-add { color: var(--emerald); background: color-mix(in oklab, var(--emerald) 12%, transparent); display:block; }
.tok-del { color: var(--error); background: color-mix(in oklab, var(--error) 12%, transparent); display:block; }
.tok-warn { color: var(--warning); }

/* ----------------------------------------------------------------------------
   11. FLOATING CODE-GLASS PANELS (hero background)
   Translucent API / JSON / RAG / SQL / workflow cards drifting behind the hero.
   Specific to AI-integrated software systems — not a generic particle network.
   CSS-driven (GPU transforms only); JS adds optional subtle pointer parallax.
   -------------------------------------------------------------------------- */
.codeglass {
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  mask-image: radial-gradient(135% 115% at 50% 0%, #000 48%, transparent 100%);
  -webkit-mask-image: radial-gradient(135% 115% at 50% 0%, #000 48%, transparent 100%);
  transform: translate3d(var(--cg-px, 0px), var(--cg-py, 0px), 0);
  transition: transform .5s var(--ease-out);
}

.cg-panel {
  position: absolute;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; line-height: 1.55;
  color: var(--muted);
  background: var(--glass);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: .6rem .8rem;
  box-shadow: var(--shadow-sm);
  -webkit-backdrop-filter: blur(7px) saturate(120%);
  backdrop-filter: blur(7px) saturate(120%);
  white-space: pre;
  animation: cg-float var(--cg-dur, 30s) var(--ease) infinite;
  will-change: transform;
}
.cg-pre { margin: .35rem 0 0; font: inherit; }
.cg-bar { display: flex; align-items: center; gap: .5em; color: var(--faint); }
.cg-p { color: var(--ink); opacity: .82; }
.cg-m {
  font-weight: 700; font-size: .62rem; letter-spacing: .06em;
  padding: .08em .45em; border-radius: var(--r-xs);
}
.cg-m--post { color: var(--accent);  background: color-mix(in oklab, var(--accent) 16%, transparent); }
.cg-m--get  { color: var(--emerald); background: color-mix(in oklab, var(--emerald) 16%, transparent); }
.cg-arrow { color: var(--primary-2); }
.cg-panel .tok-ok { color: var(--emerald); }
.cg-dotlive, .cg-ok-dot {
  width: 7px; height: 7px; border-radius: 50%; display: inline-block;
  background: var(--emerald);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--emerald) 22%, transparent);
}

/* Depth tiers — opacity + blur create a sense of distance (DOF). */
.cg--near { opacity: .58; }
.cg--mid  { opacity: .40; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.cg--far  { opacity: .26; filter: blur(.5px); }

/* Placements (left/top %), spread toward the edges to stay hover-safe. */
.cg-a { top: 8%;  left: 4%; }
.cg-b { top: 30%; right: 6%; }
.cg-c { top: 58%; left: 7%; }
.cg-d { top: 72%; right: 12%; }
.cg-e { top: 14%; right: 23%; }
.cg-f { top: 47%; left: 27%; }
.cg-g { top: 84%; left: 41%; }

@keyframes cg-float {
  0%, 100% { transform: translate3d(0, 0, 0) rotate(var(--rot, 0deg)); }
  50%      { transform: translate3d(var(--dx, 10px), var(--dy, -16px), 0) rotate(var(--rot, 0deg)); }
}

@media (max-width: 980px) {
  .cg-e, .cg-f { display: none; }
}
@media (max-width: 760px) {
  .codeglass {
    mask-image: radial-gradient(155% 120% at 50% 0%, #000 38%, transparent 100%);
    -webkit-mask-image: radial-gradient(155% 120% at 50% 0%, #000 38%, transparent 100%);
  }
  .cg-extra, .cg--far { display: none; }
  .cg-panel { font-size: .64rem; -webkit-backdrop-filter: blur(5px); backdrop-filter: blur(5px); }
}
@media (prefers-reduced-motion: reduce) {
  .codeglass { transform: none; transition: none; }
  .cg-panel { animation: none; }
}

/* ----------------------------------------------------------------------------
   12. ANIMATIONS
   -------------------------------------------------------------------------- */
@keyframes pulse { 0%,100%{ opacity:1 } 50%{ opacity:.35 } }
@keyframes float-y { 0%,100%{ transform: translateY(0) } 50%{ transform: translateY(-6px) } }
@keyframes shimmer { 0%{ background-position: -200% 0 } 100%{ background-position: 200% 0 } }
@keyframes caret { 0%,100%{ opacity:1 } 50%{ opacity:0 } }
@keyframes dash { to { stroke-dashoffset: -1000; } }

.caret::after {
  content: "▍"; color: var(--accent); margin-left: 1px;
  animation: caret 1.1s steps(1) infinite;
}

/* scroll reveal */
.reveal { opacity: 0; transform: translateY(18px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .06s; }
.reveal[data-d="2"] { transition-delay: .12s; }
.reveal[data-d="3"] { transition-delay: .18s; }
.reveal[data-d="4"] { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .float { animation: none !important; }
}

/* skeleton loading shimmer for AI demos */
.skeleton {
  background: linear-gradient(90deg, var(--card-2) 25%, var(--elevated) 37%, var(--card-2) 63%);
  background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
  border-radius: var(--r-sm);
}

.float { animation: float-y 6s var(--ease) infinite; }

/* ----------------------------------------------------------------------------
   13. BENTO GRID
   -------------------------------------------------------------------------- */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: clamp(14px, 1.6vw, 22px);
}
.bento > * { min-width: 0; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.row-2 { grid-row: span 2; }
@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2, 1fr); }
  .col-2, .col-3, .col-4, .col-6 { grid-column: span 2; }
  .row-2 { grid-row: auto; }
}
@media (max-width: 560px) {
  .bento { grid-template-columns: 1fr; }
  .col-2, .col-3, .col-4, .col-6 { grid-column: span 1; }
}

/* dividers */
.rule { height: 1px; background: var(--border); border: 0; margin: 0; }

/* small kbd */
kbd {
  font-family: 'JetBrains Mono', monospace; font-size: .72rem;
  padding: .15em .45em; border-radius: var(--r-xs);
  background: var(--bg-2); border: 1px solid var(--border); color: var(--muted);
}

/* utility text colors mapped to tokens (for use outside Tailwind too) */
.t-muted { color: var(--muted); }
.t-faint { color: var(--faint); }
.t-accent { color: var(--accent); }
.t-primary { color: var(--primary-2); }
.t-emerald { color: var(--emerald); }