/*
  /public/styles.css
  New Year greeting landing — Elastic Design
*/

:root {
  --bg0: #0b0f14;
  --bg1: #101826;
  --paper: rgba(252, 252, 252, 0.92);
  --paper-edge: rgba(255, 255, 255, 0.55);
  --ink: #101418;
  --muted: rgba(16, 20, 24, 0.66);
  --hairline: rgba(16, 20, 24, 0.12);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.20);

  --accent: #2a6f6a; /* muted teal */
  --hl-bg: rgba(42, 111, 106, 0.12);
  --hl-stroke: rgba(42, 111, 106, 0.34);

  --radius: 18px;
  --col: 720px;

  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 22px;
  --space-5: 32px;
  --space-6: 44px;
  --space-7: 64px;

  --line: 1.72;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: rgba(18, 22, 28, 0.86);
    --paper-edge: rgba(255, 255, 255, 0.08);
    --ink: rgba(255, 255, 255, 0.92);
    --muted: rgba(255, 255, 255, 0.68);
    --hairline: rgba(255, 255, 255, 0.14);
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.55);

    --hl-bg: rgba(118, 211, 201, 0.10);
    --hl-stroke: rgba(118, 211, 201, 0.28);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  font: 16px/var(--line) ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background:
    radial-gradient(1200px 700px at 18% 12%, rgba(255, 255, 255, 0.10), transparent 65%),
    radial-gradient(1100px 720px at 78% 20%, rgba(92, 191, 183, 0.09), transparent 62%),
    radial-gradient(900px 620px at 46% 80%, rgba(126, 161, 255, 0.08), transparent 64%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
  overflow-x: hidden;
}

/* Fixed background layers */
.bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.9;
  pointer-events: none;
}

.bg-veil {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(900px 720px at 50% 18%, rgba(255, 255, 255, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.22), rgba(0, 0, 0, 0.34));
}

/* Optional grain texture (CSS fallback also uses it) */
.bg-veil::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.08;
  background-image: url("./assets/grain.svg");
  background-repeat: repeat;
  mix-blend-mode: overlay;
}

/* If JS decides canvas should be off, we keep a lightweight CSS-only backdrop */
body.no-canvas .bg-canvas { display: none; }
body.no-canvas .bg-veil {
  background:
    radial-gradient(900px 720px at 50% 18%, rgba(255, 255, 255, 0.12), transparent 62%),
    radial-gradient(800px 600px at 20% 70%, rgba(92, 191, 183, 0.10), transparent 60%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  color: #101418;
  text-decoration: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
  transform: translateY(-160%);
  transition: transform 160ms ease;
  z-index: 3;
}
.skip-link:focus { transform: translateY(0); }

.top {
  position: relative;
  z-index: 2;
  padding: var(--space-4) var(--space-4) var(--space-2);
}

.top__inner {
  max-width: calc(var(--col) + 48px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
}
.mark:hover { color: rgba(255, 255, 255, 0.95); }
.mark__dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(118, 211, 201, 0.9);
  box-shadow: 0 0 0 3px rgba(118, 211, 201, 0.18);
}
.mark__text {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.10);
  color: rgba(255, 255, 255, 0.90);
  border-radius: 999px;
  padding: 10px 14px;
  font: 600 13px/1 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  letter-spacing: 0.01em;
  cursor: pointer;
  backdrop-filter: blur(10px);
}
.btn:hover { background: rgba(255, 255, 255, 0.14); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible {
  outline: 3px solid rgba(118, 211, 201, 0.35);
  outline-offset: 2px;
}

.shell {
  position: relative;
  z-index: 2;
  padding: var(--space-2) var(--space-4) var(--space-7);
}

.letter {
  max-width: var(--col);
  margin: 0 auto;
  border-radius: var(--radius);
  background: var(--paper);
  border: 1px solid var(--paper-edge);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.letter__header {
  padding: var(--space-6) var(--space-6) var(--space-4);
}
.letter__body {
  padding: 0 var(--space-6) var(--space-5);
}
.letter__footer {
  padding: var(--space-4) var(--space-6) var(--space-6);
  border-top: 1px solid var(--hairline);
}

@media (max-width: 560px) {
  .top { padding-inline: var(--space-3); }
  .shell { padding-inline: var(--space-3); }
  .letter__header, .letter__body, .letter__footer {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

.title {
  margin: 0;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
.title__name::before { content: ", "; }
.title__name:empty::before { content: ""; }

.lede {
  margin: var(--space-3) 0 0;
  color: var(--muted);
  max-width: 62ch;
}

.lines {
  margin: 0;
  font-size: 18px;
  line-height: 1.75;
  letter-spacing: -0.004em;
}

.rule {
  margin: var(--space-5) 0 var(--space-5);
  border: 0;
  height: 1px;
  background: var(--hairline);
}

.h2 {
  margin: 0 0 var(--space-2);
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.personal__p {
  margin: 0;
  max-width: 66ch;
}

.signoff {
  margin: 0;
  color: var(--muted);
}
.brand {
  color: var(--ink);
  font-weight: 650;
}

.fine {
  font-size: 12px;
  color: var(--muted);
}

.status {
  margin: var(--space-3) 0 0;
  font-size: 13px;
  color: var(--muted);
  min-height: 1.4em;
}

/* On-scroll highlight: only elements with .hl participate */
.hl {
  position: relative;
  display: inline;
  padding: 0.02em 0.08em;
  border-radius: 10px;
  background: linear-gradient(180deg, transparent 62%, var(--hl-bg) 62%);
  background-size: 100% 0%;
  background-repeat: no-repeat;
  background-position: 0 100%;
  box-shadow: inset 0 -1px 0 0 transparent;
}

.hl.is-visible {
  background-size: 100% 100%;
  box-shadow: inset 0 -1px 0 0 var(--hl-stroke);
}

@media (prefers-reduced-motion: reduce) {
  .hl { transition: none !important; }
}

@media (prefers-reduced-motion: no-preference) {
  .hl {
    transition:
      background-size 520ms cubic-bezier(0.2, 0.8, 0.2, 1),
      box-shadow 520ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }
}

/* Print-friendly */
@media print {
  body { background: #fff; }
  .bg-canvas, .bg-veil, .top, .skip-link, .js-only { display: none !important; }
  .shell { padding: 0; }
  .letter { box-shadow: none; border: 1px solid #ddd; }
}