/* ============================================================
   DennySORA resume site — shared design system
   Palette: midnight console — calm ink surfaces, amber signal,
   cyan links. Semantic tokens only; no literal colors below.
   ============================================================ */

:root {
  /* color — background / surfaces */
  --color-bg: #0A111F;
  --color-surface: #101A2E;
  --color-surface-deep: #0C1424;
  --color-surface-elevated: #17233B;

  /* color — borders */
  --color-border: #1E2C47;
  --color-border-strong: #2C3E63;
  --color-border-subtle: #16213A;

  /* color — text */
  --color-text-primary: #E8EFF9;
  --color-text-secondary: #9AA9C2;
  --color-text-tertiary: #62728F;

  /* color — accent (amber signal) */
  --color-accent: #FFB454;
  --color-accent-hover: #FFC582;
  --color-accent-active: #E39A3F;
  --color-accent-soft: rgba(255, 180, 84, 0.13);
  --color-accent-line: rgba(255, 180, 84, 0.34);

  /* color — semantic */
  --color-success: #4ADE80;
  --color-link: #6FC6F2;
  --color-focus: #FFB454;

  /* depth */
  --shadow-card: 0 12px 32px rgba(3, 8, 20, 0.45);
  --shadow-lift: 0 14px 36px rgba(3, 8, 20, 0.55);

  /* type families */
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Noto Sans JP", sans-serif;
  --font-display: "Space Grotesk", var(--font-sans);

  /* type scale */
  --text-xs: 11px;
  --text-sm: 12.5px;
  --text-body: 14px;
  --text-md: 15.5px;
  --text-lg: 17.5px;
  --text-xl: 21px;
  --text-hero: clamp(34px, 5.4vw, 52px);

  /* motion */
  --ease-out: cubic-bezier(0.2, 0.6, 0.2, 1);
  --ease-spring: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t-micro: 150ms;
  --t-fast: 200ms;
  --t-med: 260ms;
  --t-slow: 420ms;

  /* radii */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 12px;
  --r-pill: 999px;
}

/* ---------- reset / base ---------- */

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ambient glow behind the hero — the one atmospheric touch */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(720px 340px at 72% -8%, rgba(255, 180, 84, 0.07), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

::selection { background: rgba(255, 180, 84, 0.3); }

button { font: inherit; }

a { color: var(--color-link); text-decoration: none; }

/* animated underline for text links */
main a:not(.contacts a) {
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 0% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size var(--t-fast) var(--ease-out), color var(--t-micro) ease;
}

main a:not(.contacts a):hover { background-size: 100% 1px; }

/* elegant, consistent keyboard focus */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.page {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px 72px;
}

/* ---------- scroll progress ---------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), #FF8A3D);
  transform: scaleX(var(--p, 0));
  transform-origin: 0 50%;
  z-index: 60;
  pointer-events: none;
}

/* ---------- status strip ---------- */

.statusbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding: 10px 16px;
  background: var(--color-surface-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  flex-shrink: 0;
  animation: pulse 2.6s ease-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.45); }
  70%  { box-shadow: 0 0 0 7px rgba(74, 222, 128, 0); }
  100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

.statusbar .sep { color: var(--color-text-tertiary); }

/* language switcher — full interaction state set */

.langswitch {
  display: inline-flex;
  gap: 4px;
  margin-left: auto;
}

.lang-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--r-sm);
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  padding: 3px 9px;
  cursor: pointer;
  transition:
    color var(--t-micro) ease,
    border-color var(--t-micro) ease,
    background-color var(--t-micro) ease,
    transform var(--t-micro) ease;
}

.lang-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
  transform: translateY(-1px);
}

.lang-btn:active { transform: translateY(0) scale(0.96); }

.lang-btn.on {
  color: var(--color-accent);
  border-color: var(--color-accent-line);
  background: var(--color-accent-soft);
}

/* ---------- hero ---------- */

.hero { padding: 56px 0 40px; }

.hero-head {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 22px);
}

.hero .avatar {
  width: clamp(64px, 9vw, 88px);
  height: clamp(64px, 9vw, 88px);
  border-radius: 50%;
  border: 2px solid var(--color-accent-line);
  box-shadow: var(--shadow-card);
  flex-shrink: 0;
}

.hero .name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-hero);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.hero .name .handle {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(15px, 2vw, 18px);
  color: var(--color-accent);
  letter-spacing: 0.02em;
  display: block;
  margin-top: 8px;
}

.hero .role {
  margin-top: 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  color: var(--color-text-primary);
}

.hero .hero-tagline {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-text-tertiary);
}

.hero .summary {
  margin-top: 12px;
  max-width: 640px;
  color: var(--color-text-secondary);
  font-size: var(--text-md);
}

.contacts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.contacts a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: var(--color-surface-deep);
  transition:
    border-color var(--t-micro) ease,
    color var(--t-micro) ease,
    transform var(--t-micro) ease,
    background-color var(--t-micro) ease;
}

.contacts a:hover {
  border-color: var(--color-accent-line);
  color: var(--color-accent);
  transform: translateY(-1px);
}

.contacts a:active { transform: translateY(0) scale(0.97); }

.contacts .sym {
  color: var(--color-accent);
  transition: transform var(--t-micro) var(--ease-out);
}

.contacts a:hover .sym { transform: translateX(2px); }

/* ---------- sections ---------- */

section { padding-top: 44px; }

h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 22px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-xl);
  letter-spacing: -0.005em;
}

h2::before {
  content: "//";
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--color-accent);
}

/* ---------- skills ---------- */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: 14px;
}

.skill-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px 18px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.skill-card.in:hover,
.skill-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.skill-card .label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.chips { display: flex; flex-wrap: wrap; gap: 7px; }

.chip {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-line);
  border-radius: var(--r-sm);
  padding: 3px 9px;
  transition:
    background-color var(--t-micro) ease,
    border-color var(--t-micro) ease;
}

.chip:hover {
  background: rgba(255, 180, 84, 0.2);
  border-color: var(--color-accent);
}

.chip.note { color: var(--color-text-secondary); background: transparent; border-style: dashed; }

/* ---------- experience: release log ---------- */

.release {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 22px 24px 6px;
  margin-bottom: 16px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.release.in:hover,
.release:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-lift);
}

.release-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.ver {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--color-accent);
  transition: text-shadow var(--t-micro) ease;
}

.release:hover .ver { text-shadow: 0 0 18px rgba(255, 180, 84, 0.35); }

.release-title { font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg); }

.release-title .soft { font-weight: 400; color: var(--color-text-tertiary); font-size: 15px; }

.release-company { color: var(--color-text-secondary); font-size: 14.5px; }

.release-dates {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.group { padding: 18px 0 14px; }

.group + .group { border-top: 1px dashed var(--color-border); }

.group-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-accent-line);
  border-radius: 5px;
  padding: 2px 8px;
  margin-bottom: 9px;
  transition: background-color var(--t-micro) ease;
}

.group:hover .group-tag { background: var(--color-accent-soft); }

.group h3 { font-family: var(--font-sans); font-weight: 600; font-size: var(--text-md); }

ul.diff { list-style: none; margin-top: 9px; }

ul.diff li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 5px;
  color: var(--color-text-secondary);
  font-size: var(--text-body);
}

ul.diff li::before {
  content: "+";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  transition: transform var(--t-micro) var(--ease-out);
}

ul.diff li:hover::before { transform: translateX(2px); }

.group .ext {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.group .ext a { color: var(--color-accent); }

/* ---------- plain cards (detail page) ---------- */

.plain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 20px 24px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.plain-card + .plain-card { margin-top: 12px; }

.plain-card.in:hover,
.plain-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.plain-card h3 { font-family: var(--font-display); font-weight: 600; font-size: 16.5px; }
.plain-card h3 a { color: var(--color-text-primary); }
.plain-card h3 a:hover { color: var(--color-accent); }

.plain-card .desc {
  margin-top: 8px;
  color: var(--color-text-secondary);
  font-size: var(--text-body);
  max-width: 62ch;
}

.plain-card .sub {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: 3px;
  word-break: break-all;
}

.plain-card ul { list-style: none; margin-top: 10px; }
.plain-card li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 5px;
  color: var(--color-text-secondary);
  font-size: var(--text-body);
}
.plain-card li::before {
  content: "+";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  transition: transform var(--t-micro) var(--ease-out);
}
.plain-card li:hover::before { transform: translateX(2px); }

.plain-card .links { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 12px; }

.plain-card .links a { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-accent); }

.plain-card .links a:hover { color: var(--color-accent-hover); }

/* ---------- tech notes ---------- */

.note-list { display: flex; flex-direction: column; gap: 12px; }

.note-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 14px 20px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.note-item.in:hover,
.note-item:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.note-item .title { font-weight: 500; }

.note-item .url { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-text-tertiary); word-break: break-all; }

/* ---------- education ---------- */

.edu .where { color: var(--color-text-primary); font-weight: 600; }
.edu .meta { margin-top: 4px; font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-text-tertiary); }

/* ---------- footer ---------- */

footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

footer a { color: var(--color-text-secondary); }
footer a:hover { color: var(--color-accent); }

/* ---------- motion: load entrance + scroll reveal ---------- */

.statusbar, .hero { animation: rise var(--t-slow) var(--ease-spring) both; }
.hero { animation-delay: 60ms; }

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* JS tags candidates with .reveal before observing; .in = visible */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--t-slow) var(--ease-spring),
    transform var(--t-slow) var(--ease-spring);
}

.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dot { animation: none; }
  .statusbar, .hero { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-progress { display: none; }
}

/* ---------- technical profile (detail page) ---------- */

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.hero .role { font-size: clamp(22px, 3vw, 30px); max-width: 24ch; text-wrap: balance; }

/* status badges — one hue family per semantic state */
.status-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  border-radius: var(--r-pill);
  padding: 2px 9px;
  border: 1px solid;
  white-space: nowrap;
}

.b-prod     { color: var(--color-success); border-color: rgba(74, 222, 128, 0.4); }
.b-active   { color: var(--color-success); border-color: rgba(74, 222, 128, 0.4); }
.b-research { color: var(--color-accent);  border-color: var(--color-accent-line); }
.b-study    { color: var(--color-link);    border-color: rgba(111, 198, 242, 0.35); }
.b-dev      { color: var(--color-accent);  border-color: var(--color-accent-line); background: var(--color-accent-soft); }
.b-exp      { color: rgba(255, 180, 84, 0.6); border-color: rgba(255, 180, 84, 0.25); }

/* identity cards */
.id-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.id-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px 18px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.id-card.in:hover,
.id-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.id-card .label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.id-card .desc {
  margin-top: 12px;
  color: var(--color-text-secondary);
  font-size: var(--text-body);
}

/* technical depth grid */
.depth-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  align-items: start;
}

.tech-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 18px 20px 20px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.tech-card.in:hover,
.tech-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.tech-card.wide { grid-column: 1 / -1; }

.tech-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin-bottom: 10px;
}

.tech-card .label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  font-weight: 600;
}

.tech-card ul.diff { margin-top: 0; }
.tech-card ul.diff + .tg { margin-top: 12px; }

.tg {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-link);
  margin: 12px 0 2px;
}

/* terminal blocks & diagrams */
.term {
  background: var(--color-surface-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-text-secondary);
  white-space: pre;
  overflow-x: auto;
  margin-top: 12px;
}

.term .prompt { color: var(--color-accent); }
.term .cmt { color: var(--color-text-tertiary); }

/* research log cards */
.research-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 22px 24px;
  margin-bottom: 16px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.research-card.in:hover,
.research-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-lift);
}

.rd-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

.rd-id {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-accent);
}

.rd-head .status-badge { margin-left: auto; }

.research-card h3 { font-family: var(--font-display); font-weight: 600; font-size: var(--text-lg); margin-top: 16px; }

.research-card .tagline {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: 4px;
}

.research-card .desc { margin-top: 12px; color: var(--color-text-secondary); font-size: var(--text-body); max-width: 68ch; }

.research-card .chips { margin-top: 12px; }

/* principles */
.principle {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 20px 24px;
  margin-bottom: 14px;
  transition:
    border-color var(--t-fast) ease,
    transform var(--t-fast) var(--ease-out);
}

.principle.in:hover,
.principle:hover { border-color: var(--color-border-strong); transform: translateY(-2px); }

.principle .p-body { flex: 1 1 300px; }

.principle .p-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.principle h3 { font-family: var(--font-display); font-weight: 600; font-size: var(--text-md); margin: 4px 0 6px; text-transform: uppercase; letter-spacing: 0.01em; }

.principle .desc { color: var(--color-text-secondary); font-size: var(--text-body); }

.principle .p-visual { flex: 0 1 260px; }

.principle .term { margin-top: 0; }

/* exploring grid */
.explore-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.explore-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  transition:
    border-color var(--t-fast) ease,
    transform var(--t-fast) var(--ease-out);
}

.explore-card.in:hover,
.explore-card:hover { border-color: var(--color-border-strong); transform: translateY(-2px); }

.explore-card .label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: 10px;
}

/* beyond engineering mini cards */
.beyond-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.beyond-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px;
}

.beyond-card .label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.beyond-card .desc { color: var(--color-text-secondary); font-size: var(--text-body); }

/* contact row */
.contact-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* directory index cards (detail sub-page navigation) */
.dir-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.dir-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: 18px 20px;
  color: var(--color-text-primary);
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.dir-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent-line);
  box-shadow: var(--shadow-card);
}

.dir-card .dir-path {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.dir-card .dir-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
}

.dir-card .dir-desc {
  color: var(--color-text-secondary);
  font-size: var(--text-body);
  flex: 1;
}

.dir-card .dir-arrow {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  transition: transform var(--t-micro) var(--ease-out), color var(--t-micro) ease;
}

.dir-card:hover .dir-arrow { transform: translateX(3px); color: var(--color-accent); }

/* project cards */
.proj-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.proj-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 16px 18px;
  transition:
    transform var(--t-fast) var(--ease-out),
    border-color var(--t-fast) ease,
    box-shadow var(--t-fast) ease;
}

.proj-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-card);
}

.proj-card h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-md);
}

.proj-card h3 a { color: var(--color-text-primary); }
.proj-card h3 a:hover { color: var(--color-accent); }

.proj-card .desc {
  color: var(--color-text-secondary);
  font-size: var(--text-body);
  flex: 1;
}

.proj-card .meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.proj-card .meta .star { color: var(--color-accent); }

/* ---------- mobile ---------- */

@media (max-width: 640px) {
  .page { padding: 0 16px 56px; }
  .hero { padding: 40px 0 28px; }
  .release { padding: 18px 16px 4px; }
  .release-dates { margin-left: 0; }
  .plain-card { padding: 16px 18px; }
  .langswitch { margin-left: 0; width: 100%; justify-content: flex-end; }
}

/* ---------- print: conventional paper resume ---------- */

@media print {
  :root {
    --color-bg: #FFFFFF;
    --color-surface: #FFFFFF;
    --color-surface-deep: #FFFFFF;
    --color-border: #CBD5E1;
    --color-border-strong: #94A3B8;
    --color-text-primary: #111827;
    --color-text-secondary: #334155;
    --color-text-tertiary: #64748B;
    --color-accent: #B45309;
    --color-accent-hover: #B45309;
    --color-accent-soft: #FFF7ED;
    --color-accent-line: #FCD34D;
    --color-success: #059669;
    --color-link: #0369A1;
  }
  body::before { display: none; }
  body { font-size: 11.5px; line-height: 1.5; }
  .page { max-width: none; padding: 0; }
  .statusbar { margin-top: 0; }
  .langswitch, .scroll-progress, .hero .avatar { display: none; }
  .statusbar, .hero, section, footer { animation: none; }
  .reveal { opacity: 1 !important; transform: none !important; }
  section { padding-top: 22px; }
  .hero { padding: 24px 0 16px; }
  .release, .skill-card, .plain-card, .note-item,
  .tech-card, .research-card, .id-card, .principle, .explore-card, .beyond-card { break-inside: avoid; }
  .term { white-space: pre-wrap; }
  footer { margin-top: 28px; }
  main a::after { content: " (" attr(href) ")"; font-family: var(--font-mono); font-size: 9.5px; color: var(--color-text-tertiary); }
}