/* ============================================================================
 * DMCI — "Compile Once, Differentiate Everywhere"
 * Design system. Dark-first, with a light theme via [data-theme="light"].
 * Identity: an instrument for thinking about gradients — ink-dark surfaces,
 * a violet→teal "gradient-flow" accent, crisp mono for code/data.
 * ==========================================================================*/

/* ---- Fonts (graceful system fallbacks if offline) ---------------------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;450;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---- Tokens ------------------------------------------------------------ */
:root {
  --font-display: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, monospace;

  /* dark theme (default) */
  --c-bg: #080a10;
  --c-bg-1: #0c0f17;
  --c-bg-2: #11141e;
  --c-bg-3: #171b29;
  --c-bg-soft: rgba(255, 255, 255, 0.03);
  --c-panel: rgba(255, 255, 255, 0.022);
  --c-text: #e9edf6;
  --c-heading: #f6f8fc;
  --c-muted: #9aa4b7;
  --c-faint: #6b7689;
  --c-border: rgba(255, 255, 255, 0.09);
  --c-border-strong: rgba(255, 255, 255, 0.16);

  --c-accent: #8b6dff;   /* violet */
  --c-accent2: #2fe0c8;  /* teal */
  --c-accent-soft: rgba(139, 109, 255, 0.14);
  --c-accent2-soft: rgba(47, 224, 200, 0.13);
  --c-warn: #ff9a5c;
  --c-pink: #ff5c9d;
  --c-blue: #5ca8ff;
  --c-lime: #9ff05c;
  --c-good: #34d29a;
  --c-bad: #ff6b7d;

  --c-grid: rgba(255, 255, 255, 0.06);
  --c-axis: rgba(255, 255, 255, 0.34);

  --grad: linear-gradient(120deg, var(--c-accent) 0%, #7aa0ff 45%, var(--c-accent2) 100%);
  --grad-soft: linear-gradient(120deg, rgba(139,109,255,.16), rgba(47,224,200,.12));
  --grad-text: linear-gradient(120deg, #b6a3ff 0%, #8fd9ff 50%, #5ff0d8 100%);

  /* code syntax */
  --syn-kw: #c9a6ff;     /* keywords / special forms */
  --syn-fn: #79d0ff;     /* function/op names */
  --syn-num: #6ff0c8;    /* numbers */
  --syn-str: #ffb27a;    /* strings */
  --syn-com: #5e6779;    /* comments */
  --syn-var: #e9edf6;    /* identifiers */
  --syn-punc: #8b95a8;   /* parens */

  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 22px;
  --shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.7), 0 2px 8px -2px rgba(0,0,0,.4);
  --shadow-glow: 0 0 0 1px var(--c-border), 0 20px 60px -20px rgba(139, 109, 255, 0.35);
  --maxw: 1180px;
  --readw: 760px;
  --nav-h: 62px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

[data-theme="light"] {
  --c-bg: #f7f8fb;
  --c-bg-1: #ffffff;
  --c-bg-2: #ffffff;
  --c-bg-3: #f0f2f7;
  --c-bg-soft: rgba(20, 26, 40, 0.025);
  --c-panel: rgba(255, 255, 255, 0.7);
  --c-text: #232a38;
  --c-heading: #11151f;
  --c-muted: #5a6478;
  --c-faint: #94a0b4;
  --c-border: rgba(20, 30, 55, 0.12);
  --c-border-strong: rgba(20, 30, 55, 0.2);
  --c-accent: #6b4eff;
  --c-accent2: #00b39a;
  --c-accent-soft: rgba(107, 78, 255, 0.1);
  --c-accent2-soft: rgba(0, 179, 154, 0.1);
  --c-grid: rgba(20, 30, 55, 0.08);
  --c-axis: rgba(20, 30, 55, 0.45);
  --grad: linear-gradient(120deg, #6b4eff 0%, #4f7dff 45%, #00b39a 100%);
  --grad-text: linear-gradient(120deg, #6b4eff 0%, #2f7dff 50%, #00a98f 100%);
  --grad-soft: linear-gradient(120deg, rgba(107,78,255,.1), rgba(0,179,154,.08));
  --shadow: 0 18px 44px -22px rgba(30, 40, 80, 0.32), 0 2px 8px -3px rgba(30,40,80,.15);
  --shadow-glow: 0 0 0 1px var(--c-border), 0 20px 54px -24px rgba(107, 78, 255, 0.28);
  --syn-kw: #7a3edb; --syn-fn: #1f7fd1; --syn-num: #0a9b78;
  --syn-str: #c2640a; --syn-com: #94a0b4; --syn-var: #232a38; --syn-punc: #6a7488;
}

/* ---- Reset / base ------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { animation-duration: .001ms !important; transition-duration: .001ms !important; } }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
body::before {
  /* faint dot grid + radial glows */
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(900px 600px at 78% -8%, rgba(139, 109, 255, 0.13), transparent 60%),
    radial-gradient(800px 600px at 8% 8%, rgba(47, 224, 200, 0.08), transparent 55%);
  pointer-events: none;
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: -2; opacity: .5;
  background-image: radial-gradient(var(--c-grid) 1px, transparent 1px);
  background-size: 34px 34px;
  -webkit-mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 30%, transparent 80%);
  mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 30%, transparent 80%);
  pointer-events: none;
}
[data-theme="light"] body::before {
  background:
    radial-gradient(900px 600px at 78% -8%, rgba(107, 78, 255, 0.08), transparent 60%),
    radial-gradient(800px 600px at 8% 8%, rgba(0, 179, 154, 0.06), transparent 55%);
}

h1, h2, h3, h4 { font-family: var(--font-display); color: var(--c-heading); line-height: 1.12; font-weight: 600; letter-spacing: -0.02em; margin: 0 0 .5em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); letter-spacing: -0.01em; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1.1em; }
a { color: var(--c-accent2); text-decoration: none; transition: color .15s; }
a:hover { color: var(--c-accent); }
strong, b { color: var(--c-heading); font-weight: 600; }
hr { border: none; border-top: 1px solid var(--c-border); margin: 3rem 0; }
::selection { background: var(--c-accent-soft); color: var(--c-heading); }

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.mono { font-family: var(--font-mono); }

/* ---- Layout ------------------------------------------------------------ */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
section { padding: clamp(56px, 8vw, 110px) 0; position: relative; }
.section-tight { padding: clamp(36px, 5vw, 64px) 0; }
.read { max-width: var(--readw); }
.center { text-align: center; }
.muted { color: var(--c-muted); }
.faint { color: var(--c-faint); }
.lead { font-size: 1.2rem; color: var(--c-muted); line-height: 1.6; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: .76rem; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--c-accent2); margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 22px; height: 1.5px; background: var(--grad); }

.section-head { margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; }

/* ---- Nav --------------------------------------------------------------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h); z-index: 100;
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--c-bg) 78%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--c-border); }
.nav .container { display: flex; align-items: center; gap: 22px; width: 100%; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 600; color: var(--c-heading); font-size: 1.05rem; letter-spacing: -.01em; }
.brand .logo { width: 28px; height: 28px; flex: none; }
.nav-links { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav-links a {
  color: var(--c-muted); font-size: .92rem; font-weight: 500; padding: 7px 12px; border-radius: 9px;
  transition: color .15s, background .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--c-heading); background: var(--c-bg-soft); }
.nav-cta { background: var(--grad); color: #fff !important; padding: 8px 16px !important; border-radius: 10px; font-weight: 600 !important; box-shadow: 0 6px 18px -6px var(--c-accent); }
.nav-cta:hover { filter: brightness(1.08); }
.theme-toggle, .nav-burger {
  background: var(--c-bg-soft); border: 1px solid var(--c-border); color: var(--c-muted);
  width: 36px; height: 36px; border-radius: 9px; cursor: pointer; display: grid; place-items: center;
  transition: all .15s;
}
.theme-toggle:hover, .nav-burger:hover { color: var(--c-heading); border-color: var(--c-border-strong); }
.nav-burger { display: none; }

.progress-bar { position: fixed; top: 0; left: 0; height: 2.5px; background: var(--grad); z-index: 101; width: 0; transition: width .1s linear; }

/* ---- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px; cursor: pointer;
  font-family: var(--font-body); font-weight: 600; font-size: .96rem;
  padding: 12px 22px; border-radius: 11px; border: 1px solid transparent;
  transition: transform .12s var(--ease), box-shadow .2s, filter .15s, background .15s; text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 30px -10px var(--c-accent); }
.btn-primary:hover { filter: brightness(1.07); color: #fff; box-shadow: 0 14px 38px -10px var(--c-accent); }
.btn-ghost { background: var(--c-bg-soft); border-color: var(--c-border); color: var(--c-heading); }
.btn-ghost:hover { border-color: var(--c-border-strong); background: var(--c-bg-3); color: var(--c-heading); }
.btn svg { width: 18px; height: 18px; }
.btn-sm { padding: 8px 14px; font-size: .86rem; border-radius: 9px; }

/* ---- Pills / badges ---------------------------------------------------- */
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: .76rem; font-weight: 500; letter-spacing: .03em;
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--c-border);
  background: var(--c-bg-soft); color: var(--c-muted);
}
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--c-accent2); }
.tag { font-family: var(--font-mono); font-size: .72rem; padding: 3px 8px; border-radius: 6px; background: var(--c-accent-soft); color: var(--c-accent); border: 1px solid var(--c-accent-soft); }

/* ---- Cards ------------------------------------------------------------- */
.card {
  background: var(--c-panel); border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 26px; transition: transform .25s var(--ease), border-color .25s, box-shadow .25s;
  backdrop-filter: blur(6px);
}
.card.hover:hover { transform: translateY(-4px); border-color: var(--c-border-strong); box-shadow: var(--shadow); }
.grid { display: grid; gap: 22px; }
/* allow grid/flex children to shrink below content min-size (fixes <pre>/chart
   overflow on narrow screens) */
.grid > *, .split > * { min-width: 0; }
.code, pre, .chart { max-width: 100%; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.icon-badge { width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center; background: var(--grad-soft); border: 1px solid var(--c-border); color: var(--c-accent2); margin-bottom: 14px; }
.icon-badge svg { width: 22px; height: 22px; }

/* ---- Stat cards -------------------------------------------------------- */
.stat { text-align: left; }
.stat .num { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.9rem, 4vw, 2.8rem); line-height: 1; background: var(--grad-text); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat .lbl { color: var(--c-muted); font-size: .92rem; margin-top: 8px; }

/* ---- Code blocks ------------------------------------------------------- */
.code {
  position: relative; background: var(--c-bg-1); border: 1px solid var(--c-border);
  border-radius: var(--radius); overflow: hidden; margin: 0 0 1.4em;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.02);
}
.code-head { display: flex; align-items: center; gap: 8px; padding: 9px 14px; border-bottom: 1px solid var(--c-border); background: var(--c-bg-soft); }
.code-dots { display: flex; gap: 6px; }
.code-dots i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; background: var(--c-bg-3); }
.code-title { font-family: var(--font-mono); font-size: .76rem; color: var(--c-faint); margin-left: 6px; }
.code-lang { margin-left: auto; font-family: var(--font-mono); font-size: .7rem; color: var(--c-faint); text-transform: uppercase; letter-spacing: .08em; }
.code-copy { background: none; border: 1px solid var(--c-border); color: var(--c-faint); border-radius: 7px; padding: 3px 9px; font-size: .72rem; cursor: pointer; font-family: var(--font-mono); transition: all .15s; }
.code-copy:hover { color: var(--c-heading); border-color: var(--c-border-strong); }
pre { margin: 0; padding: 18px 20px; overflow-x: auto; font-family: var(--font-mono); font-size: .86rem; line-height: 1.7; }
pre code { font-family: inherit; }
code { font-family: var(--font-mono); font-size: .9em; }
:not(pre) > code { background: var(--c-bg-soft); padding: .12em .42em; border-radius: 5px; border: 1px solid var(--c-border); color: var(--c-accent2); font-size: .85em; }

/* syntax tokens */
.tok-kw { color: var(--syn-kw); } .tok-fn { color: var(--syn-fn); }
.tok-num { color: var(--syn-num); } .tok-str { color: var(--syn-str); }
.tok-com { color: var(--syn-com); font-style: italic; } .tok-punc { color: var(--syn-punc); }
.tok-var { color: var(--syn-var); } .tok-builtin { color: var(--c-pink); }

/* ---- Callouts ---------------------------------------------------------- */
.callout {
  display: flex; gap: 14px; padding: 18px 20px; border-radius: var(--radius);
  background: var(--c-bg-soft); border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent); margin: 1.5em 0;
}
.callout.aha { border-left-color: var(--c-accent2); background: var(--c-accent2-soft); }
.callout.warn { border-left-color: var(--c-warn); }
.callout .ic { flex: none; color: var(--c-accent); margin-top: 2px; }
.callout.aha .ic { color: var(--c-accent2); }
.callout h4 { margin: 0 0 4px; }
.callout p:last-child { margin: 0; }

/* ---- Tables ------------------------------------------------------------ */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: var(--radius); }
table.data { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.data th, table.data td { padding: 11px 15px; text-align: left; border-bottom: 1px solid var(--c-border); }
table.data th { font-family: var(--font-display); font-weight: 600; color: var(--c-heading); background: var(--c-bg-soft); font-size: .82rem; letter-spacing: .02em; }
table.data td { color: var(--c-muted); }
table.data td.num, table.data th.num { font-family: var(--font-mono); text-align: right; }
table.data tr:last-child td { border-bottom: none; }
table.data tr:hover td { background: var(--c-bg-soft); color: var(--c-text); }
.win { color: var(--c-good); font-weight: 600; }
.lose { color: var(--c-bad); }

/* ---- Charts ------------------------------------------------------------ */
.chart-wrap { background: var(--c-panel); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 20px; }
.chart { width: 100%; height: auto; display: block; }
.chart-line { transition: opacity .2s; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: center; margin-top: 12px; font-size: .82rem; color: var(--c-muted); }
.donut-legend { flex-direction: column; align-items: flex-start; gap: 7px; }
.legend-item { display: inline-flex; align-items: center; gap: 7px; }
.legend-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.chart-tip { background: var(--c-bg-3); border: 1px solid var(--c-border-strong); border-radius: 9px; padding: 9px 12px; font-size: .82rem; color: var(--c-text); box-shadow: var(--shadow); max-width: 260px; }
.chart-tip .tip-x { font-family: var(--font-mono); color: var(--c-faint); font-size: .76rem; margin-bottom: 5px; }
.chart-tip .tip-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 5px; }
.chart-tip b { color: var(--c-heading); font-family: var(--font-mono); }
.chart-title { font-family: var(--font-display); font-weight: 600; color: var(--c-heading); font-size: 1.02rem; margin-bottom: 2px; }
.chart-sub { color: var(--c-faint); font-size: .84rem; margin-bottom: 14px; }
.chart-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.toggle-chip { font-family: var(--font-mono); font-size: .78rem; padding: 5px 12px; border-radius: 8px; border: 1px solid var(--c-border); background: var(--c-bg-soft); color: var(--c-muted); cursor: pointer; transition: all .15s; user-select: none; display: inline-flex; align-items: center; gap: 6px; }
.toggle-chip .sw { width: 9px; height: 9px; border-radius: 50%; background: currentColor; opacity: .9; }
.toggle-chip.active { color: var(--c-heading); border-color: var(--c-border-strong); background: var(--c-bg-3); }
.toggle-chip.off { opacity: .45; text-decoration: line-through; }

/* ---- Footer ------------------------------------------------------------ */
.footer { border-top: 1px solid var(--c-border); padding: 56px 0 40px; margin-top: 40px; background: var(--c-bg-1); }
.footer .container { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 36px; }
.footer h4 { font-family: var(--font-display); font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; color: var(--c-faint); margin-bottom: 14px; }
.footer a { color: var(--c-muted); display: block; padding: 4px 0; font-size: .92rem; }
.footer a:hover { color: var(--c-accent2); }
.footer .copy { grid-column: 1 / -1; border-top: 1px solid var(--c-border); margin-top: 24px; padding-top: 22px; color: var(--c-faint); font-size: .86rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* ---- Scroll reveal ----------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; } .reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; } .reveal.d4 { transition-delay: .32s; }

/* ---- Misc utility ------------------------------------------------------ */
.kbd { font-family: var(--font-mono); font-size: .8em; background: var(--c-bg-3); border: 1px solid var(--c-border); border-bottom-width: 2px; border-radius: 5px; padding: 1px 6px; color: var(--c-text); }
.divider-label { display: flex; align-items: center; gap: 16px; color: var(--c-faint); font-family: var(--font-mono); font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; margin: 0 0 28px; }
.divider-label::before, .divider-label::after { content: ""; height: 1px; background: var(--c-border); flex: 1; }
.scrim { background: var(--c-bg-1); }

/* ---- Responsive -------------------------------------------------------- */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .footer .container { grid-template-columns: 1fr 1fr; }
  .nav-links { position: fixed; top: var(--nav-h); right: 0; left: 0; flex-direction: column; align-items: stretch; background: var(--c-bg-1); border-bottom: 1px solid var(--c-border); padding: 12px; gap: 4px; transform: translateY(-120%); transition: transform .3s var(--ease); }
  .nav-links.open { transform: none; box-shadow: var(--shadow); }
  .nav-links a { padding: 12px; }
  .nav-burger { display: grid; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer .container { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
}