/* ============================================================================
   system.css — the design system for rishablodha.com
   "Ink & Bronze": a warm charcoal ground, light that comes from the accent,
   layered glass surfaces, and a serif display face. The 3D hero scene
   (public/d4/scene.js) draws its palette from these tokens.

   Token NAMES are kept from the previous paper theme on purpose — pages,
   the server renderers, and the article template all reference them. Values
   changed; nothing else had to.
   ========================================================================== */

/* ----------------------------------------------------------------------------
   1. TOKENS
   ---------------------------------------------------------------------------- */
:root {
  /* -- color -- warm charcoal, not black; bronze, not decoration */
  --paper:      #100e0b;                /* page ground                       */
  --paper-deep: #17140f;                /* raised surface                    */
  --paper-raise:#1d1913;                /* highest surface (hover, cards)    */
  --ink:        #f4efe7;                /* primary text                      */
  --ink-soft:   #cfc6b8;                /* strong secondary                  */
  --dim:        #a89d8b;                /* secondary text (AA on ground)     */
  --faint:      #857a69;                /* small labels (AA at 11.5px bold)  */
  --hair:       rgba(244, 239, 231, .09);
  --hair-strong:rgba(244, 239, 231, .17);
  --bronze:     #d9a55f;                /* the accent: links, kickers, light */
  --bronze-hot: #f0c385;                /* accent hover / active             */
  --bronze-deep:#8a6534;                /* accent pressed / borders          */
  --bronze-wash:rgba(217, 165, 95, .08);/* accent tint surface               */
  --bronze-edge:rgba(217, 165, 95, .38);/* accent hairline                   */
  --glow:       0 0 46px rgba(217, 165, 95, .13), 0 24px 70px -30px rgba(0,0,0,.85);
  --sheen: linear-gradient(145deg, rgba(244,239,231,.055), rgba(244,239,231,0) 42%);

  /* -- type -- system only; zero font requests */
  --font-display: ui-serif, Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;

  --text-display: clamp(46px, 6.6vw, 84px);
  --text-h1:      clamp(34px, 4.4vw, 52px);
  --text-h2:      clamp(27px, 3.2vw, 38px);
  --text-h3:      clamp(20px, 1.9vw, 24px);
  --text-body:    clamp(16px, 1vw + 12.5px, 18px);
  --text-small:   15.5px;
  --text-micro:   11.5px;

  --leading-display: 1.04;
  --leading-body:    1.68;
  --tracking-display: -.022em;
  --tracking-h2:      -.014em;
  --tracking-label:   .16em;

  /* -- spacing -- 8px rhythm */
  --s-1:  8px;   --s-2: 16px;  --s-3: 24px;  --s-4: 32px;
  --s-5:  40px;  --s-6: 48px;  --s-7: 56px;  --s-8: 64px;
  --s-9:  72px;  --s-10: 80px; --s-11: 88px; --s-12: 96px;

  --sp-nav-h:      68px;
  --sp-hero-top:   clamp(56px, 9vw, 104px);
  --sp-hero-bottom:clamp(40px, 6vw, 72px);
  --sp-section:    clamp(56px, 8vw, 96px);
  --sp-gutter:     clamp(20px, 4vw, 40px);

  /* -- shape -- squared-off luxury */
  --r-btn:  3px;
  --r-card: 6px;

  /* -- motion -- power4-out feel; durations short */
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --t-ui: .18s;
  --t-reveal: .7s;

  /* -- layout -- */
  --wrap-max: 1060px;
  --measure: 66ch;
  --nav-z: 50;
}

/* ----------------------------------------------------------------------------
   2. BASE
   ---------------------------------------------------------------------------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background:
    radial-gradient(1100px 520px at 82% -8%, rgba(217,165,95,.055), transparent 62%),
    radial-gradient(900px 700px at -12% 108%, rgba(217,165,95,.04), transparent 58%),
    var(--paper);
  color: var(--ink);
  font: var(--text-body) / var(--leading-body) var(--font-display);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

::selection { background: var(--bronze); color: #14100a; }

h1, h2, h3 {
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: var(--tracking-h2);
}

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

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

.v-wrap { max-width: var(--wrap-max); margin: 0 auto; padding-inline: var(--sp-gutter); }

/* ----------------------------------------------------------------------------
   3. TYPE PRIMITIVES
   ---------------------------------------------------------------------------- */
.v-display {
  font-size: var(--text-display);
  font-weight: 400;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
  color: var(--ink);
}
.v-h1 {
  font-size: var(--text-h1);
  font-weight: 400;
  letter-spacing: var(--tracking-display);
  line-height: 1.1;
  color: var(--ink);
}
.v-h2 {
  font-size: var(--text-h2);
  font-weight: 400;
  letter-spacing: var(--tracking-h2);
  line-height: 1.16;
  color: var(--ink);
  margin: var(--s-2) 0 var(--s-3);
}
.v-h3 {
  font-size: var(--text-h3);
  font-weight: 400;
  letter-spacing: -.008em;
  line-height: 1.32;
  color: var(--ink);
}
.v-body { font-size: var(--text-body); line-height: var(--leading-body); }
.v-small { font-size: var(--text-small); line-height: 1.62; color: var(--dim); }
.v-lede {
  font-size: clamp(17px, 1.3vw + 13px, 21px);
  line-height: 1.58;
  color: var(--dim);
  max-width: 46ch;
}
.v-lede b { color: var(--ink-soft); font-weight: 600; }

.v-kicker {
  display: block;
  font: 600 var(--text-micro) var(--font-sans);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--bronze);
}
.v-kicker--quiet { color: var(--faint); }

/* ----------------------------------------------------------------------------
   4. COMPONENTS
   ---------------------------------------------------------------------------- */

/* -- .v-nav — dark glass bar ------------------------------------------------- */
.v-nav {
  position: sticky;
  top: 0;
  z-index: var(--nav-z);
  background: rgba(16, 14, 11, .78);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hair);
}
.v-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  height: var(--sp-nav-h);
}
.v-brand {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--ink);
  white-space: nowrap;
}
.v-nav__links {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  font: 600 var(--text-micro) var(--font-sans);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--dim);
  flex-wrap: wrap;
  justify-content: flex-end;
}
.v-nav__links a { transition: color var(--t-ui); }
.v-nav__links a:hover { color: var(--bronze); }
.v-nav__links a.is-on { color: var(--ink); }

/* -- .v-btn ------------------------------------------------------------------ */
.v-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-btn);
  font: 600 var(--text-micro) var(--font-sans);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--t-ui), border-color var(--t-ui), color var(--t-ui),
              transform var(--t-ui), box-shadow var(--t-ui);
}
.v-btn--primary {
  background: linear-gradient(160deg, var(--bronze-hot), var(--bronze) 55%, var(--bronze-deep));
  color: #171208;
  box-shadow: 0 10px 30px -12px rgba(217, 165, 95, .45);
}
.v-btn--primary:hover { transform: translateY(-1px); box-shadow: 0 14px 38px -12px rgba(217,165,95,.6); }
.v-btn--ghost { border-color: var(--hair-strong); color: var(--ink); background: rgba(244,239,231,.02); }
.v-btn--ghost:hover { border-color: var(--bronze-edge); color: var(--bronze); }

/* -- .v-card — glass panel, bronze on hover, 3D tilt target ------------------ */
.v-card {
  position: relative;
  display: block;
  border: 1px solid var(--hair);
  border-radius: var(--r-card);
  background:
    var(--sheen),
    linear-gradient(180deg, var(--paper-raise), var(--paper-deep));
  padding: var(--s-4);
  transform-style: preserve-3d;
  transition: border-color var(--t-ui), box-shadow var(--t-ui), transform .25s var(--ease-out);
}
.v-card:hover {
  border-color: var(--bronze-edge);
  box-shadow: var(--glow);
}
.v-card__tag {
  font: 600 var(--text-micro) var(--font-sans);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--bronze);
}
.v-card h3 { font-size: var(--text-h3); margin: 12px 0 8px; }
.v-card p { font-size: var(--text-small); color: var(--dim); line-height: 1.62; }
.v-card__meta {
  margin-top: 18px;
  font: 500 var(--text-micro) var(--font-sans);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--faint);
}

/* -- .v-list — the typographic essay index ---------------------------------- */
.v-list { border-top: 1px solid var(--hair); }
.v-item {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: var(--s-3);
  padding: var(--s-4) var(--s-2);
  border-bottom: 1px solid var(--hair);
  align-items: baseline;
  border-radius: var(--r-btn);
  transition: background var(--t-ui), box-shadow var(--t-ui);
}
.v-item:hover {
  background: linear-gradient(90deg, var(--bronze-wash), transparent 70%);
  box-shadow: inset 2px 0 0 var(--bronze);
}
.v-item__meta {
  font: 500 var(--text-micro) var(--font-sans);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--faint);
  padding-top: .45em;
  white-space: nowrap;
}
.v-item__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 1.7vw, 23px);
  font-weight: 400;
  margin: 0;
  line-height: 1.3;
  letter-spacing: -.012em;
  color: var(--ink);
  transition: color var(--t-ui);
}
.v-item:hover .v-item__title { color: var(--bronze); }
.v-item__desc {
  font-size: var(--text-small);
  line-height: 1.6;
  color: var(--dim);
  margin-top: 7px;
  max-width: 62ch;
}

/* -- .v-rule — a labelled divider with bronze origin ------------------------ */
.v-rule {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-bottom: var(--s-5);
}
.v-rule::after {
  content: "";
  flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--bronze-edge), var(--hair) 55%);
}

/* -- .v-footer -------------------------------------------------------------- */
.v-footer {
  border-top: 1px solid var(--hair);
  padding: var(--s-6) 0 var(--s-8);
  color: var(--dim);
  font-size: var(--text-small);
}
.v-footer__inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--s-2);
  align-items: baseline;
}
.v-footer a { color: var(--dim); transition: color var(--t-ui); }
.v-footer a:hover { color: var(--bronze); }

/* -- .reveal — quiet rise -------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-reveal) var(--ease-out), transform var(--t-reveal) var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }

/* -- .v-field — inputs ------------------------------------------------------ */
.v-field {
  width: 100%;
  background: rgba(244,239,231,.03);
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-btn);
  color: var(--ink);
  padding: 13px 15px;
  font: inherit;
  font-size: var(--text-small);
}
.v-field::placeholder { color: var(--faint); }
.v-field:focus { outline: 2px solid var(--bronze); outline-offset: 1px; border-color: var(--bronze); }

/* ----------------------------------------------------------------------------
   5. UTILITIES
   ---------------------------------------------------------------------------- */
.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;
}

@media (max-width: 700px) {
  .v-item { grid-template-columns: 1fr; gap: 4px; padding: var(--s-3) 0; }
  .v-item__meta { padding-top: 0; }
  .v-nav__inner { height: auto; padding-block: 14px; flex-wrap: wrap; gap: 10px; }
}

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

@media print {
  body { background: #fff; color: #000; }
  .v-nav, .v-footer { display: none; }
  a { text-decoration: underline; }
}

/* -- .v-item--feature — the one essay a newcomer should read first ----------- */
.v-item--feature {
  border-left: 3px solid var(--bronze);
  background: linear-gradient(90deg, var(--bronze-wash), transparent 65%);
  margin-top: var(--s-3);
  border-radius: 0 var(--r-card) var(--r-card) 0;
}
.v-item--feature .v-item__title { font-size: clamp(22px, 2vw, 28px); color: var(--bronze-hot); }

@media (hover:none) {
  .v-item:active { background: var(--bronze-wash); box-shadow: inset 2px 0 0 var(--bronze); }
}