/* ==========================================================================
   base.css — design tokens, reset, typography, layout primitives
   Mohannad Muhana — Software Engineer / .NET Developer
   ========================================================================== */

:root {
  /* --- surface ------------------------------------------------------- */
  --bg: #05070c;
  --bg-elev: #080c14;
  --panel: #0b111c;
  --panel-2: #0e1524;
  --glass: rgba(148, 178, 214, 0.045);
  --glass-strong: rgba(148, 178, 214, 0.08);

  /* --- lines ---------------------------------------------------------- */
  --line: rgba(125, 160, 205, 0.14);
  --line-soft: rgba(125, 160, 205, 0.08);
  --line-strong: rgba(125, 160, 205, 0.3);

  /* --- text ----------------------------------------------------------- */
  --text: #e7eef8;
  --text-2: #a9b8cc;
  --muted: #71849c;

  /* --- signal palette (industrial semantics) -------------------------- */
  --accent: #22d3ee;          /* data / telemetry  */
  --accent-deep: #0891b2;
  --accent-2: #f0a63c;        /* energy / power    */
  --ok: #3dd68c;              /* running           */
  --warn: #f5a524;            /* warning           */
  --alarm: #ff5c6c;           /* alarm             */
  --violet: #8b7dfa;          /* application layer */

  /* --- effects -------------------------------------------------------- */
  --glow: 0 0 0 1px rgba(34, 211, 238, 0.28), 0 0 34px -8px rgba(34, 211, 238, 0.55);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 18px 46px -22px rgba(0, 0, 0, 0.9);
  --shadow-lg: 0 40px 80px -32px rgba(0, 0, 0, 0.95);

  /* --- geometry ------------------------------------------------------- */
  --r-xs: 6px;
  --r-sm: 10px;
  --r: 14px;
  --r-lg: 20px;
  --r-xl: 28px;

  --nav-h: 68px;
  --shell: 1240px;
  --gutter: clamp(1.15rem, 4vw, 2.5rem);

  /* --- type ----------------------------------------------------------- */
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: dark;
}

/* ==========================================================================
   Reset
   ========================================================================== */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1.5rem);
}

body {
  min-width: 320px;
  min-height: 100svh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  font-feature-settings: "cv02", "cv03", "cv04", "ss01";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

/* Ambient field: fixed grid + radial wash. Painted behind everything,
   composited once, never animated — costs nothing on scroll. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 620px at 78% -8%, rgba(34, 211, 238, 0.11), transparent 62%),
    radial-gradient(760px 560px at 8% 6%, rgba(139, 125, 250, 0.09), transparent 60%),
    radial-gradient(1100px 700px at 50% 108%, rgba(240, 166, 60, 0.06), transparent 64%),
    var(--bg);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 100% 70% at 50% 0%, #000 20%, transparent 78%);
  opacity: 0.75;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button { background: none; border: 0; cursor: pointer; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover { color: #67e8f9; }

ul, ol { list-style: none; padding: 0; }

:target { scroll-margin-top: calc(var(--nav-h) + 2rem); }

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.022em;
  color: #fff;
  text-wrap: balance;
}

h1 { font-size: clamp(2.3rem, 1.35rem + 4.2vw, 4.3rem); font-weight: 700; letter-spacing: -0.035em; }
h2 { font-size: clamp(1.85rem, 1.2rem + 2.6vw, 2.9rem); letter-spacing: -0.03em; }
h3 { font-size: clamp(1.25rem, 1.05rem + 0.85vw, 1.6rem); }
h4 { font-size: clamp(1.05rem, 0.98rem + 0.35vw, 1.2rem); }
h5 { font-size: 0.98rem; }

p { text-wrap: pretty; }

.lede {
  font-size: clamp(1.02rem, 0.95rem + 0.4vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-2);
}

strong { color: #fff; font-weight: 600; }

code, .mono { font-family: var(--font-mono); }

/* Small uppercase technical label — the connective tissue of the whole UI */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.kicker::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent));
  flex: none;
}

.kicker--plain::before { display: none; }

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.shell {
  width: min(100% - (var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(4rem, 2.4rem + 6.4vw, 7.5rem);
}

.section--tight { padding-block: clamp(3rem, 2rem + 4vw, 5rem); }

.section__head {
  max-width: 62ch;
  margin-bottom: clamp(2.2rem, 1.4rem + 2.6vw, 3.6rem);
}

.section__head > h2 { margin-block: 0.85rem 0.9rem; }

.section__head--center {
  margin-inline: auto;
  text-align: center;
}

.section__head--center .kicker::before { display: none; }

/* Hairline that separates major bands */
.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

.grid { display: grid; gap: clamp(1rem, 0.7rem + 1.1vw, 1.5rem); }

/* Auto-fit grids: the single mechanism behind every equal-height card row.
   min() keeps a lone card from stretching full width on narrow screens. */
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); }

/* ==========================================================================
   Utilities
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  inset-inline-start: 0.75rem;
  z-index: 200;
  padding: 0.7rem 1.15rem;
  border-radius: var(--r-sm);
  background: var(--accent);
  color: #04121a;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform 0.22s var(--ease-out);
}

.skip-link:focus-visible { transform: translateY(0); }

:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

.text-accent { color: var(--accent); }
.text-muted { color: var(--muted); }

/* ==========================================================================
   Scroll reveal — driven by IntersectionObserver in js/ui/reveal.js.
   Transform + opacity only, so it never triggers layout.
   ========================================================================== */

/* Scoped to .js (set by an inline script in <head>): without scripting there
   is nothing to add .is-visible, so an unscoped opacity:0 would hide the
   entire page. */
.js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* ==========================================================================
   Reduced motion — honour the OS setting everywhere, including the
   decorative SVG data-flow animations.
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js [data-reveal] { opacity: 1; transform: none; }
}

/* ==========================================================================
   Selection & scrollbar
   ========================================================================== */

::selection {
  background: rgba(34, 211, 238, 0.28);
  color: #fff;
}

@supports selector(::-webkit-scrollbar) {
  ::-webkit-scrollbar { width: 11px; height: 11px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb {
    background: #1b2536;
    border: 3px solid var(--bg);
    border-radius: 99px;
  }
  ::-webkit-scrollbar-thumb:hover { background: #26344a; }
}

html { scrollbar-color: #1b2536 var(--bg); scrollbar-width: thin; }