/* ============================================================
   chayu163.github.io — Bento layout
   12-col grid; cards carry the rhythm.
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* Type scale */
  --t-xs:   0.75rem;
  --t-sm:   0.875rem;
  --t-base: 1rem;
  --t-lg:   1.25rem;
  --t-xl:   1.75rem;
  --t-2xl:  2.5rem;
  --t-3xl:  4rem;

  /* Spacing */
  --s-1:  4px;
  --s-2:  8px;
  --s-3:  12px;
  --s-4:  16px;
  --s-6:  24px;
  --s-8:  32px;
  --s-12: 48px;
  --s-16: 64px;
  --s-24: 96px;

  /* Color — dark default
     Warm neutral (yellow chroma) + warm orange accent. */
  --bg:        oklch(16% 0.008 70);
  --bg-soft:   oklch(20% 0.008 70);
  --bg-line:   oklch(28% 0.010 70);
  --fg:        oklch(96% 0.006 80);
  --fg-soft:   oklch(74% 0.010 80);
  --fg-dim:    oklch(58% 0.012 75);
  --accent:    oklch(78% 0.14 50);
  --accent-fg: oklch(18% 0.010 70);
  --good:      oklch(72% 0.14 150);

  /* Motion */
  --ease: cubic-bezier(.2,.7,.2,1);
  --dur:  180ms;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg:        oklch(99% 0.005 85);
    --bg-soft:   oklch(100% 0 0);
    --bg-line:   oklch(90% 0.010 80);
    --fg:        oklch(22% 0.010 60);
    --fg-soft:   oklch(44% 0.012 60);
    --fg-dim:    oklch(60% 0.012 65);
    --accent:    oklch(58% 0.16 45);
    --accent-fg: oklch(99% 0 0);
    --good:      oklch(56% 0.14 150);
  }
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
html {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'cv11', 'ss01';
}
body {
  min-height: 100dvh;
  line-height: 1.6;
}

/* ---------- Focus + motion preferences ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* Reveal-on-load: stagger fade-up for bento cards. */
@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.rise {
  opacity: 0;
  animation: rise 320ms var(--ease) both;
  animation-delay: var(--delay, 0ms);
}
.rise--1 { --delay: 0ms; }
.rise--2 { --delay: 80ms; }
.rise--3 { --delay: 160ms; }
.rise--4 { --delay: 240ms; }
.rise--5 { --delay: 320ms; }
.rise--6 { --delay: 400ms; }

/* Blinking caret on the eyebrow. */
@keyframes blink { 50% { opacity: 0; } }
.eyebrow {
  position: relative;
}
.eyebrow::after {
  content: "_";
  display: inline-block;
  margin-left: 4px;
  color: var(--accent);
  animation: blink 1.1s steps(1) infinite;
}

/* Link underline that grows from the left on hover. */
.link {
  position: relative;
  color: var(--fg-soft);
  transition: color var(--dur) var(--ease);
}
.link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms var(--ease);
}
.link:hover { color: var(--accent); }
.link:hover::after { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
  .rise { opacity: 1; transform: none; animation: none; }
  .eyebrow::after { animation: none; opacity: 1; }
  .link::after { display: none; }
  .bento:hover { transform: none; }
}

/* ---------- Layout ---------- */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--s-12) var(--s-6) var(--s-24);
}
@media (max-width: 700px) {
  .page { padding: var(--s-8) var(--s-4) var(--s-16); }
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-rows: minmax(64px, auto);
  gap: var(--s-3);
}
@media (min-width: 700px) {
  .grid {
    grid-template-columns: repeat(6, 1fr);
    grid-auto-rows: minmax(72px, auto);
    gap: var(--s-4);
  }
}
@media (min-width: 1024px) {
  .grid {
    grid-template-columns: repeat(12, 1fr);
  }
}

/* ---------- Bento card ---------- */
.bento {
  padding: var(--s-6);
  border: 1px solid var(--bg-line);
  border-radius: 12px;
  background: var(--bg-soft);
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  min-height: 160px;
  transition: border-color var(--dur) var(--ease), transform 240ms var(--ease);
}
.bento:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.bento__label {
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--fg-dim);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.bento__title {
  font-size: var(--t-xl);
  font-weight: 600;
  letter-spacing: -.015em;
  margin: 0;
  text-wrap: balance;
}
.bento__body {
  color: var(--fg-soft);
  margin: 0;
  font-size: var(--t-sm);
  text-wrap: pretty;
  max-width: 38em;
}
.bento__meta {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--fg-dim);
}
.bento__link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  color: var(--accent);
  font-size: var(--t-sm);
  font-weight: 500;
  transition: gap var(--dur) var(--ease);
}
.bento__link:hover { gap: var(--s-3); }

/* ---------- Grid placement — single column (mobile) ---------- */
.bento--hero    { grid-column: span 1; grid-row: span 6; }
.bento--project { grid-column: span 1; grid-row: span 5; }
.bento--stack   { grid-column: span 1; grid-row: span 6; }
.bento--about   { grid-column: span 1; grid-row: span 4; }
.bento--contact { grid-column: span 1; grid-row: span 4; }

/* ---------- Grid placement — 6 cols (tablet) ---------- */
@media (min-width: 700px) {
  .bento--hero    { grid-column: span 6; grid-row: span 6; }
  .bento--project { grid-column: span 3; grid-row: span 5; }
  .bento--stack   { grid-column: span 3; grid-row: span 6; }
  .bento--about   { grid-column: span 3; grid-row: span 4; }
  .bento--contact { grid-column: span 3; grid-row: span 4; }
}

/* ---------- Grid placement — 12 cols (desktop) ---------- */
@media (min-width: 1024px) {
  .bento--hero    { grid-column: span 7; grid-row: span 7; }
  .bento--project { grid-column: span 5; grid-row: span 3; }
  .bento--stack   { grid-column: span 5; grid-row: span 4; }
  .bento--about   { grid-column: span 7; grid-row: span 4; }
  .bento--contact { grid-column: span 12; grid-row: span 3; }
}

/* ---------- Bento internals ---------- */
.bento--hero .bento__title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  letter-spacing: -.03em;
}
.bento--hero .bento__lede {
  font-size: var(--t-lg);
  color: var(--fg-soft);
  max-width: 28em;
  margin: 0;
}
.bento--hero .bento__actions {
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
  margin-top: auto;
}

.bento--stack .bento__groups {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  margin-top: auto;
}
.bento--stack .bento__group h3 {
  font-size: var(--t-xs);
  font-family: var(--font-mono);
  color: var(--fg-dim);
  letter-spacing: .12em;
  text-transform: uppercase;
  margin: 0 0 var(--s-2);
  font-weight: 500;
}
.bento--stack .bento__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
}

.bento--contact .bento__contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2) var(--s-6);
  align-items: center;
  margin-top: auto;
}
.bento--contact .bento__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--good);
  display: inline-block;
  margin-right: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  min-height: 44px;
  padding: 0 var(--s-4);
  border: 1px solid var(--bg-line);
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--fg);
  font-size: var(--t-sm);
  font-weight: 500;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.btn:hover { border-color: var(--accent); }
.btn--primary {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: transparent;
}
.btn--primary:hover { filter: brightness(1.05); }
.btn--ghost { background: transparent; }

/* ---------- Tag chip ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--bg-line);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--fg-soft);
  background: var(--bg-soft);
}

/* ---------- Status ---------- */
.status {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--fg-dim);
  letter-spacing: .04em;
}
.status__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--good);
}