/* ============================================================
   Ponteo × Digital Culture — Beta Proposal
   Visual system: Stripe-inspired editorial scaffold,
   Ponteo brand colors (violet → teal), Inter-led typography.
   ============================================================ */

:root {
  /* Surfaces */
  --paper: #fafafa;
  --paper-warm: #f3f4f6;
  --paper-line: rgba(15, 23, 42, 0.08);
  --paper-line-strong: rgba(15, 23, 42, 0.14);
  --canvas: #ffffff;
  --ink: #0a1530;
  --ink-soft: #2b3a52;
  --ink-quiet: #5d6b85;
  --ink-faint: #8d99b0;

  /* Dark interludes (Stripe navy with Ponteo undertone) */
  --dark: #0a2540;
  --dark-2: #0d2e4f;
  --dark-3: #112d50;
  --dark-line: rgba(255, 255, 255, 0.10);
  --dark-line-soft: rgba(255, 255, 255, 0.06);
  --dark-ink: #f6f9fc;
  --dark-ink-soft: #c4d2e5;
  --dark-ink-quiet: #8fa1ba;

  /* Ponteo brand */
  --violet: #7A3EFF;
  --violet-deep: #5b25d9;
  --violet-soft: #efeafd;
  --indigo: #635BFF;     /* mid-stop, Stripe-adjacent */
  --teal: #00C2A8;
  --teal-deep: #009984;
  --teal-soft: #e6f7f4;

  /* Stripe-style sweep — anchors the deck's signature ribbon */
  --sweep: linear-gradient(95deg, #ff6118 0%, #cf2cab 28%, #7A3EFF 58%, #635BFF 78%, #00C2A8 100%);
  --sweep-soft: linear-gradient(135deg, #7A3EFF 0%, #635BFF 45%, #00C2A8 100%);
  --sweep-meta: linear-gradient(135deg, #ff6118 0%, #cf2cab 50%, #7A3EFF 100%);

  /* Signal */
  --signal-amber: #ffb84c;
  --signal-red: #ff4c61;
  --signal-blue: #3f8cff;

  /* Type */
  --display: "Inter Tight", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Spacing */
  --gutter: clamp(16px, 1.4vw, 32px);
  --pad: clamp(20px, 5vw, 96px);
  --section: clamp(80px, 12vh, 180px);
  --block: clamp(40px, 6vw, 96px);

  /* Motion */
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in-out: cubic-bezier(.65, 0, .35, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--violet); color: white; }

/* -----------------------------------------------------------
   Persistent chrome
   ----------------------------------------------------------- */
.chrome-top {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 18px var(--pad);
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  pointer-events: none;
  transition: backdrop-filter .3s, background .3s, border-color .3s;
}
.chrome-top > * { pointer-events: auto; }
.chrome-top.scrolled {
  background: rgba(250, 250, 250, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--paper-line);
}
.chrome-top.dark.scrolled {
  background: rgba(10, 37, 64, .80);
  border-bottom: 1px solid var(--dark-line);
}

.brand {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--display);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--ink);
  transition: color .3s;
}
.brand .x {
  color: var(--ink-faint);
  font-weight: 400;
}
.chrome-top.dark .brand { color: var(--dark-ink); }
.chrome-top.dark .brand .x { color: var(--dark-ink-quiet); }

.chrome-meta {
  display: flex; align-items: center; gap: 18px;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-quiet);
  letter-spacing: -0.005em;
}
.chrome-top.dark .chrome-meta { color: var(--dark-ink-quiet); }
.chrome-meta .sep { width: 1px; height: 12px; background: currentColor; opacity: .25; }

/* Chapter rail (desktop) */
.rail {
  position: fixed;
  right: clamp(20px, 3vw, 48px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  display: flex; flex-direction: column;
  gap: 14px;
  pointer-events: none;
}
.rail-dot {
  pointer-events: auto;
  display: flex; align-items: center; justify-content: flex-end;
  gap: 12px;
  color: var(--ink-quiet);
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: color .3s;
}
.rail-dot .num { font-weight: 600; min-width: 16px; text-align: right; opacity: .55; }
.rail-dot .label { opacity: 0; transform: translateX(8px); transition: opacity .3s, transform .3s; }
.rail-dot .pip {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; opacity: .35;
  transition: opacity .3s, transform .3s, background .3s;
}
.rail-dot:hover .label,
.rail-dot.active .label { opacity: 1; transform: translateX(0); }
.rail-dot.active { color: var(--violet); }
.rail-dot.active .pip { opacity: 1; transform: scale(1.6); background: var(--violet); }
.rail-dot.active .num { opacity: 1; }
.chrome-top.dark ~ .rail .rail-dot { color: var(--dark-ink-quiet); }
.chrome-top.dark ~ .rail .rail-dot.active { color: white; }
.chrome-top.dark ~ .rail .rail-dot.active .pip { background: var(--teal); }

@media (max-width: 900px) {
  .rail { display: none; }
}

/* -----------------------------------------------------------
   Spread structure — every chapter is a "spread"
   ----------------------------------------------------------- */
section[data-spread] {
  position: relative;
  padding: var(--section) var(--pad);
  overflow: hidden;
}
section[data-spread].dark {
  background: var(--dark);
  color: var(--dark-ink);
}
section[data-spread].warm {
  background: var(--paper-warm);
}

.eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--violet);
  display: inline-flex; align-items: center; gap: 10px;
}
.eyebrow::before {
  content: ""; width: 22px; height: 1px;
  background: currentColor;
}
.dark .eyebrow { color: var(--teal); }

.kicker {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-quiet);
}
.dark .kicker { color: var(--dark-ink-quiet); }

.display-1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(48px, 8vw, 132px);
  line-height: 0.96;
  letter-spacing: -0.045em;
}
.display-2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(40px, 5.6vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.038em;
}
.display-3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(32px, 3.6vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.028em;
}
.lede {
  font-family: var(--sans);
  font-size: clamp(18px, 1.3vw, 22px);
  line-height: 1.55;
  color: var(--ink-soft);
  font-weight: 400;
  letter-spacing: -0.01em;
  max-width: 56ch;
}
.dark .lede { color: var(--dark-ink-soft); }

.body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.dark .body { color: var(--dark-ink-soft); }

.hairline {
  height: 1px;
  background: var(--paper-line-strong);
}
.dark .hairline { background: var(--dark-line); }

.sweep-text {
  background: var(--sweep);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  background: var(--violet-soft);
  color: var(--violet-deep);
  border: 1px solid rgba(122, 62, 255, 0.18);
}
.dark .pill {
  background: rgba(0, 194, 168, 0.10);
  color: var(--teal);
  border-color: rgba(0, 194, 168, 0.32);
}
.pill .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor;
}

/* -----------------------------------------------------------
   Gradient mesh backgrounds
   ----------------------------------------------------------- */
.mesh {
  position: absolute; inset: 0;
  pointer-events: none;
  z-index: 0;
}
.mesh::before, .mesh::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
}
.mesh::before {
  width: 60vw; height: 60vw;
  left: -20vw; top: -10vw;
  background: radial-gradient(circle at center, rgba(122,62,255,0.45) 0%, rgba(122,62,255,0) 60%);
}
.mesh::after {
  width: 55vw; height: 55vw;
  right: -15vw; bottom: -10vw;
  background: radial-gradient(circle at center, rgba(0,194,168,0.40) 0%, rgba(0,194,168,0) 60%);
}
.dark .mesh::before {
  background: radial-gradient(circle at center, rgba(122,62,255,0.32) 0%, rgba(122,62,255,0) 60%);
}
.dark .mesh::after {
  background: radial-gradient(circle at center, rgba(0,194,168,0.22) 0%, rgba(0,194,168,0) 60%);
}

section[data-spread] > *:not(.mesh) { position: relative; z-index: 1; }

/* -----------------------------------------------------------
   Reveal primitives — JS-driven via GSAP. CSS keeps content
   visible by default so non-JS fallback never goes blank.
   ----------------------------------------------------------- */
.split-line { overflow: hidden; }
.split-line > span { display: inline-block; }

/* -----------------------------------------------------------
   Cards / Surfaces
   ----------------------------------------------------------- */
.card {
  background: var(--canvas);
  border: 1px solid var(--paper-line);
  border-radius: 16px;
  padding: 28px;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), border-color .35s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 50px -12px rgba(15,23,42,0.12), 0 6px 18px -6px rgba(15,23,42,0.06);
  border-color: rgba(122,62,255,0.22);
}
.dark .card {
  background: rgba(255,255,255,0.04);
  border-color: var(--dark-line);
}
.dark .card:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(0,194,168,0.32);
  box-shadow: 0 18px 50px -12px rgba(0,0,0,0.45);
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  background: var(--ink);
  color: white;
  transition: transform .25s var(--ease-out), background .25s;
}
.btn:hover { transform: translateY(-1px); background: var(--violet); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--paper-line-strong); }
.btn.ghost:hover { background: var(--ink); color: white; border-color: var(--ink); }
.dark .btn.ghost { color: var(--dark-ink); border-color: var(--dark-line); }
.dark .btn.ghost:hover { background: var(--dark-ink); color: var(--dark); border-color: var(--dark-ink); }

/* -----------------------------------------------------------
   Mobile baseline
   ----------------------------------------------------------- */
@media (max-width: 720px) {
  section[data-spread] { padding: clamp(64px, 12vh, 100px) clamp(20px, 6vw, 32px); }
  .display-1 { font-size: clamp(40px, 11vw, 64px); }
  .display-2 { font-size: clamp(32px, 8vw, 48px); }
  .display-3 { font-size: clamp(26px, 6.5vw, 38px); }
  .lede { font-size: 17px; }
}