:root {
  --paper:        #FFFFFF;
  --paper-2:      #FAF8F5;
  --paper-3:      #F4F1EC;
  --tint:         #FFF4EC;
  --tint-strong:  #FFE8D6;

  --ink:          #111111;
  --ink-2:        #3D3A36;
  --muted:        #6B6762;
  --faint:        #9A948C;

  --line:         #EAE6E0;
  --line-strong:  #DDD7CE;

  --o:            #FF6B00;
  --o-2:          #FF8A3D;
  --o-deep:       #D94F00;
  --o-ink:        #B33F00;  

  --term-bg:      #1A1815;
  --term-bar:     #2B2E3A;
  --term-text:    #E8E4DE;
  --term-dim:     #8C877F;
  --term-green:   #6FCF7F;
  --term-orange:  #FF7A1A;

  --shadow-sm: 0 1px 2px rgba(23, 18, 12, .05);
  --shadow-md: 0 4px 20px -6px rgba(23, 18, 12, .10);
  --shadow-lg: 0 24px 60px -24px rgba(23, 18, 12, .22);
  --shadow-o:  0 20px 50px -20px rgba(255, 107, 0, .38);

  /* ---- Type ---- */
  --font-display: "Plus Jakarta Sans", "Inter", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --t-hero:  clamp(2.3rem, 1.5rem + 3.4vw, 4.15rem);
  --t-h2:    clamp(2rem, 1.35rem + 2.6vw, 3.4rem);
  --t-h3:    clamp(1.25rem, 1.05rem + .8vw, 1.6rem);
  --t-lead:  clamp(1.02rem, .96rem + .38vw, 1.22rem);
  --t-body:  1rem;
  --t-sm:    .9rem;
  --t-xs:    .78rem;

  /* ---- Layout ---- */
  --wrap: 1200px;
  --gutter: clamp(1.15rem, .6rem + 2.4vw, 3.5rem);
  --section-y: clamp(3rem, 2.2rem + 2.8vw, 5rem);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 28px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --dur: .38s;
}

[data-theme="dark"] {
  --paper:        #0E0D0C;
  --paper-2:      #151311;
  --paper-3:      #1B1815;
  --tint:         #1E1510;
  --tint-strong:  #2A1B12;

  --ink:          #F6F3EF;
  --ink-2:        #D6D0C8;
  --muted:        #A19A91;
  --faint:        #746D65;

  --line:         #282420;
  --line-strong:  #3A342E;

  --o:            #FF7B1A;
  --o-2:          #FF9A52;
  --o-deep:       #FF6B00;
  --o-ink:        #FF9448;

  --term-bg:      #0A0908;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 20px -6px rgba(0,0,0,.55);
  --shadow-lg: 0 24px 60px -24px rgba(0,0,0,.8);
}

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.65;
  color: var(--ink-2);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color .4s var(--ease), color .4s var(--ease);
}

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

button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: none; cursor: pointer; }

a { color: inherit; text-decoration: none; }

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

:focus-visible {
  outline: 2px solid var(--o);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: var(--o); color: #fff; }

/* Typography                                                       */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.03em;
}

h3, h4 { font-weight: 700; letter-spacing: -.02em; line-height: 1.25; }

p { text-wrap: pretty; }

.lead {
  font-size: var(--t-lead);
  line-height: 1.6;
  color: var(--muted);
  max-width: 56ch;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  letter-spacing: .02em;
}

.hl { color: var(--o); }

/* Layout primitives                                                */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: var(--section-y);
}

.section--tint { background: var(--paper-2); }
.section--warm { background: linear-gradient(180deg, var(--paper) 0%, var(--tint) 55%, var(--paper) 100%); }

.section-head {
  display: grid;
  gap: 1rem;
  margin-bottom: clamp(1.8rem, 1.3rem + 1.6vw, 2.8rem);
  max-width: 62ch;
}

.section-mark {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--o-ink);
  font-weight: 500;
}

.section-mark::before {
  content: "";
  width: 26px;
  height: 3px;
  border-radius: 2px;
  background: var(--o);
  flex: none;
}

.section-head h2 { font-size: var(--t-h2); }

.section-head p {
  font-size: var(--t-lead);
  color: var(--muted);
  max-width: 54ch;
}

.grid { display: grid; gap: clamp(1rem, .6rem + 1.2vw, 1.6rem); }

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

.skip-link {
  position: absolute; top: 0; left: 50%;
  transform: translate(-50%, -120%);
  z-index: 200;
  background: var(--o); color: #fff;
  padding: .7rem 1.2rem;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  font-weight: 600;
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
  transition-delay: var(--d, 0ms);
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}