/* ============================================================================
   Tanuj Kumar — portfolio + blog
   Plain CSS. Design tokens live in :root, themes below it.
   ========================================================================== */

/* ------------------------------------------------------------------ tokens */

:root {
  --font-sans: "Inter var", ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;

  --page: 1100px;
  --measure: 70ch;
  --gutter: clamp(1.15rem, 0.6rem + 2vw, 2.5rem);
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fast: 0.18s var(--ease);
  --slow: 0.55s var(--ease);

  /* Accent hues used by project cards and tags. */
  --violet: #a78bfa;
  --teal: #2dd4bf;
  --amber: #fbbf24;
  --rose: #fb7185;
}

html[data-theme="dark"] {
  --bg: #0b0f16;
  --bg-1: #111826;
  --bg-2: #161f30;
  --bg-code: #0d131d;
  --line: #1f2a3c;
  --line-soft: #16202f;
  --fg: #e8eef7;
  --fg-1: #9fb0c6;
  --fg-2: #6b7c93;
  --brand: #58a6ff;
  --brand-2: #a78bfa;
  --brand-wash: rgba(88, 166, 255, 0.13);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(88, 166, 255, 0.16), transparent 70%);
  --card-shadow: 0 1px 0 rgba(255, 255, 255, 0.03), 0 12px 32px -18px rgba(0, 0, 0, 0.9);
  --grid-line: rgba(255, 255, 255, 0.028);
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #ffffff;
  --bg-1: #f7f9fc;
  --bg-2: #eef2f8;
  --bg-code: #f6f8fa;
  --line: #e2e8f0;
  --line-soft: #eef1f6;
  --fg: #0f1621;
  --fg-1: #4d5c70;
  --fg-2: #7b8798;
  --brand: #1d5ff0;
  --brand-2: #7c3aed;
  --brand-wash: rgba(29, 95, 240, 0.08);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(29, 95, 240, 0.1), transparent 70%);
  --card-shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 12px 28px -20px rgba(16, 24, 40, 0.3);
  --grid-line: rgba(15, 22, 33, 0.035);
  color-scheme: light;
}

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

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Faint grid, sits behind everything. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 75%);
  pointer-events: none;
}

img, svg { max-width: 100%; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
button { font: inherit; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus {
  left: 1rem; top: 1rem; z-index: 60;
  background: var(--bg-1); border: 1px solid var(--line);
  padding: 0.5rem 0.9rem; border-radius: var(--r-sm);
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1;
  padding: 0.22em 0.4em;
  color: var(--fg-2);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 5px;
}

/* --------------------------------------------------------- reading progress */

.progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  z-index: 50;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: width 0.1s linear, opacity var(--fast);
  opacity: 0;
}
.progress.on { opacity: 1; }

/* ----------------------------------------------------------------- topbar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--fast), background var(--fast);
}
.topbar.scrolled { border-bottom-color: var(--line); }

.topbar-inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0.7rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand { display: flex; align-items: center; gap: 0.55rem; color: var(--fg); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-name { letter-spacing: -0.02em; }
.brand .dim { color: var(--fg-2); font-weight: 400; }

.brand-mark {
  width: 26px;
  height: 26px;
  flex: none;
  display: block;
  filter: drop-shadow(0 0 10px color-mix(in srgb, var(--brand) 28%, transparent));
  transition: transform var(--slow), filter var(--fast);
}
.brand:hover .brand-mark {
  transform: rotate(-6deg) scale(1.06);
  filter: drop-shadow(0 0 14px color-mix(in srgb, var(--brand) 45%, transparent));
}

.nav { display: flex; gap: 0.25rem; margin-left: auto; }
.nav a {
  position: relative;
  padding: 0.4rem 0.75rem;
  border-radius: var(--r-sm);
  color: var(--fg-1);
  font-size: 0.92rem;
  transition: color var(--fast), background var(--fast);
}
.nav a:hover { color: var(--fg); background: var(--bg-1); text-decoration: none; }
.nav a.active { color: var(--fg); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 0.75rem; right: 0.75rem; bottom: 0.1rem;
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
}

.topbar-actions { display: flex; align-items: center; gap: 0.35rem; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.5rem;
  color: var(--fg-1);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: color var(--fast), background var(--fast), border-color var(--fast);
}
.icon-btn:hover { color: var(--fg); background: var(--bg-1); border-color: var(--line); }
.icon-btn svg {
  width: 17px; height: 17px;
  fill: none; stroke: currentColor; stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round;
}
.palette-open kbd { pointer-events: none; }

html[data-theme="dark"] .i-sun { display: none; }
html[data-theme="light"] .i-moon { display: none; }

.menu-btn { display: none; }

@media (max-width: 720px) {
  .menu-btn { display: inline-flex; }
  .palette-open kbd { display: none; }
  .nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.4rem var(--gutter) 0.9rem;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--fast), transform var(--fast);
  }
  .nav.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav a { padding: 0.7rem 0.5rem; }
  .nav a.active::after { left: 0.5rem; right: auto; width: 18px; }
}

/* ----------------------------------------------------------------- layout */

main { min-height: 70vh; }

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

.section { padding: clamp(3rem, 7vw, 5.5rem) 0 0; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.eyebrow::before {
  content: "";
  width: 18px; height: 1px;
  background: linear-gradient(90deg, var(--brand), transparent);
}

h1, h2, h3 { letter-spacing: -0.025em; line-height: 1.18; }

.link-more {
  font-size: 0.88rem;
  font-family: var(--font-mono);
  color: var(--fg-1);
  white-space: nowrap;
}
.link-more:hover { color: var(--brand); text-decoration: none; }
.link-more span { transition: transform var(--fast); display: inline-block; }
.link-more:hover span { transform: translateX(3px); }

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

.hero {
  position: relative;
  padding: clamp(3.5rem, 9vw, 7rem) 0 0;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -12rem 0 auto;
  height: 34rem;
  z-index: -1;
  background: var(--glow);
  pointer-events: none;
}

/* ------------------------------------------ ambient technical icon layer */

.tech-bg {
  position: absolute;
  inset: -4rem 0 -2rem;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  /* Fade out towards the text so the icons never fight the copy. */
  mask-image: radial-gradient(120% 100% at 50% 40%, transparent 22%, #000 68%);
}
.hero .wrap { position: relative; z-index: 1; }

.tech-glyph {
  position: absolute;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.1;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.13;
  transform: rotate(var(--rot, 0deg));
  animation: drift var(--dur, 22s) var(--delay, 0s) ease-in-out infinite;
  /* No `will-change` here on purpose. Permanently promoting ten elements to
     their own compositor layers is what causes intermittent full-page flashes
     on some GPUs, and these animations are slow enough not to need it. */
}

/* Stop animating when the hero is scrolled away or the tab is in the
   background — nothing to see, and it keeps the compositor quiet. */
.tech-bg.paused .tech-glyph { animation-play-state: paused; }
.tech-glyph:nth-child(even) { stroke: var(--brand-2); opacity: 0.11; }
.tech-glyph:nth-child(3n)   { stroke: var(--teal); opacity: 0.1; }

html[data-theme="light"] .tech-glyph { opacity: 0.16; stroke-width: 1.25; }
html[data-theme="light"] .tech-glyph:nth-child(even) { opacity: 0.14; }
html[data-theme="light"] .tech-glyph:nth-child(3n) { opacity: 0.13; }

@keyframes drift {
  0%, 100% { transform: rotate(var(--rot)) translate3d(0, 0, 0); }
  33%      { transform: rotate(calc(var(--rot) + 5deg)) translate3d(6px, -12px, 0); }
  66%      { transform: rotate(calc(var(--rot) - 4deg)) translate3d(-8px, 7px, 0); }
}

@media (max-width: 720px) {
  /* Fewer, smaller glyphs on narrow screens. */
  .tech-glyph:nth-child(n + 6) { display: none; }
  .tech-glyph { opacity: 0.09; }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem 0.3rem 0.55rem;
  margin-bottom: 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-1);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.dot-live {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--teal) 22%, transparent);
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink { 50% { opacity: 0.35; } }

.hero h1 {
  font-size: clamp(2.3rem, 1.3rem + 5vw, 4.25rem);
  font-weight: 680;
  margin: 0 0 0.9rem;
  max-width: 22ch;
}
.hero h1 .grad {
  background: linear-gradient(100deg, var(--brand), var(--brand-2) 55%, var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.rotator {
  display: inline-block;
  position: relative;
  min-width: 1ch;
}
.rotator::after {
  content: "";
  display: inline-block;
  width: 3px;
  height: 0.92em;
  margin-left: 3px;
  vertical-align: -0.09em;
  background: var(--brand);
  animation: caret 1.1s steps(1) infinite;
}
/* Fades rather than hard-blinks — less of a strobe next to the headline. */
@keyframes caret { 50% { opacity: 0.15; } }

/* Typewriter disabled: static phrase, no caret at all. */
.rotator.static::after { display: none; }

.hero-blurb {
  max-width: 56ch;
  font-size: clamp(1rem, 0.95rem + 0.3vw, 1.14rem);
  color: var(--fg-1);
  margin: 0 0 2rem;
}

.hero-cta { display: flex; flex-wrap: wrap; gap: 0.7rem; align-items: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.62rem 1.15rem;
  border-radius: var(--r-sm);
  font-size: 0.94rem;
  font-weight: 550;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--fast), box-shadow var(--fast), background var(--fast), border-color var(--fast);
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 24px -12px var(--brand);
}
.btn-primary:hover { box-shadow: 0 14px 30px -12px var(--brand); }
.btn-ghost {
  color: var(--fg);
  background: var(--bg-1);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--fg-2); }
.btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* stats strip */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  margin-top: clamp(3rem, 6vw, 4.5rem);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}
.stat { background: var(--bg); padding: 1.1rem 1.25rem; }
.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 1.1rem + 0.8vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--fg), var(--fg-1));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { font-size: 0.78rem; color: var(--fg-2); text-transform: uppercase; letter-spacing: 0.07em; }

/* --------------------------------------------------------------- projects */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.35rem 1.4rem 1.25rem;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--card-shadow);
  overflow: hidden;
  transition: transform var(--slow), border-color var(--fast);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent, var(--brand)), transparent);
  opacity: 0;
  transition: opacity var(--fast);
}
/* Cursor-following sheen, driven by --mx/--my set in JS. */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(220px circle at var(--mx, 50%) var(--my, 0%),
              color-mix(in srgb, var(--accent, var(--brand)) 12%, transparent), transparent 65%);
  opacity: 0;
  transition: opacity var(--fast);
}
.card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent, var(--brand)) 40%, var(--line)); }
.card:hover::before, .card:hover::after { opacity: 1; }

.card[data-accent="violet"] { --accent: var(--violet); }
.card[data-accent="teal"]   { --accent: var(--teal); }
.card[data-accent="amber"]  { --accent: var(--amber); }
.card[data-accent="rose"]   { --accent: var(--rose); }

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.5rem;
  font-size: 1.06rem;
}
.pin {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent, var(--brand));
  border: 1px solid color-mix(in srgb, var(--accent, var(--brand)) 35%, transparent);
  border-radius: 999px;
  padding: 0.1rem 0.42rem;
}
.card p { margin: 0 0 1rem; color: var(--fg-1); font-size: 0.93rem; }
.card-foot { margin-top: auto; }
.card-links { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 0.85rem; font-size: 0.86rem; font-family: var(--font-mono); }
.card-links a span { display: inline-block; transition: transform var(--fast); }
.card-links a:hover { text-decoration: none; }
.card-links a:hover span { transform: translateX(3px); }

.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg-1);
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: 5px;
  padding: 0.16rem 0.45rem;
}

/* --------------------------------------------------------------- verticals */

.vertical-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 0.85rem;
}

.vertical {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  padding: 1rem 1.15rem 1.05rem;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color var(--fast), transform var(--fast);
}
.vertical:hover { border-color: color-mix(in srgb, var(--brand) 45%, var(--line)); transform: translateY(-2px); }

.vertical-icon {
  flex: none;
  width: 26px;
  height: 26px;
  margin-top: 0.15rem;
  fill: none;
  stroke: var(--brand);
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.85;
}
.vertical:hover .vertical-icon { opacity: 1; }

.vertical h3 { margin: 0 0 0.3rem; font-size: 1rem; }
.vertical p { margin: 0; font-size: 0.89rem; color: var(--fg-1); line-height: 1.55; }

/* Small credit line for verticals backed by hands-on years, not just deals. */
.lived {
  display: inline-block;
  margin-top: 0.55rem;
  padding: 0.14rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--teal);
  background: color-mix(in srgb, var(--teal) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--teal) 30%, transparent);
  border-radius: 5px;
}

/* ------------------------------------------------------------- post lists */

.posts { list-style: none; margin: 0; padding: 0; }

.post-row { border-top: 1px solid var(--line-soft); }
.post-row:first-child { border-top: none; }

.post-row > a {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1.5rem;
  padding: 1.35rem 0.9rem;
  margin: 0 -0.9rem;
  border-radius: var(--r-md);
  color: inherit;
  transition: background var(--fast), transform var(--fast);
}
.post-row > a:hover { text-decoration: none; background: var(--bg-1); transform: translateX(3px); }
.post-row > a:hover .post-title { color: var(--brand); }

.post-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-2);
  padding-top: 0.28rem;
  white-space: nowrap;
}
.post-title { margin: 0 0 0.35rem; font-size: 1.1rem; transition: color var(--fast); }
.post-sum { margin: 0 0 0.7rem; color: var(--fg-1); font-size: 0.92rem; max-width: 62ch; }
.post-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 0.35rem; }
.post-read { font-family: var(--font-mono); font-size: 0.72rem; color: var(--fg-2); }

@media (max-width: 640px) {
  .post-row > a { grid-template-columns: 1fr; gap: 0.35rem; }
  .post-date { padding-top: 0; }
}

/* --------------------------------------------------------- blog index page */

.page-head { padding: clamp(2.5rem, 6vw, 4rem) 0 0; }
.page-head h1 { font-size: clamp(1.9rem, 1.4rem + 2.4vw, 2.9rem); margin: 0.5rem 0 0.5rem; }
.page-head .lede { color: var(--fg-1); max-width: 58ch; margin: 0; }

.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 1.8rem 0 0.5rem;
}
.search-box { position: relative; flex: 1 1 220px; max-width: 320px; }
.search-box svg {
  position: absolute; left: 0.7rem; top: 50%; transform: translateY(-50%);
  width: 15px; height: 15px;
  fill: none; stroke: var(--fg-2); stroke-width: 1.8; stroke-linecap: round;
  pointer-events: none;
}
.search-box input {
  width: 100%;
  font: inherit;
  font-size: 0.92rem;
  color: var(--fg);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 0.5rem 0.7rem 0.5rem 2rem;
  transition: border-color var(--fast);
}
.search-box input::placeholder { color: var(--fg-2); }
.search-box input:focus { border-color: var(--brand); outline: none; }

.tag-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-1);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  cursor: pointer;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}
.tag-btn:hover { color: var(--fg); border-color: var(--fg-2); }
.tag-btn[aria-pressed="true"] {
  color: var(--brand);
  border-color: color-mix(in srgb, var(--brand) 50%, transparent);
  background: var(--brand-wash);
}

.result-count { font-family: var(--font-mono); font-size: 0.78rem; color: var(--fg-2); margin: 1.2rem 0 0; }

.empty {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--fg-2);
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  margin-top: 1.5rem;
}

/* Pre-first-post state on the writing index. */
.empty-first {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  margin-top: 2.25rem;
  padding: 2.5rem 1.25rem;
  background: var(--bg-1);
  border-style: solid;
}
.empty-first p { margin: 0 0 0.5rem; font-size: 0.94rem; }
.empty-first .btn { margin-top: 0; }

/* ---------------------------------------------------------------- pagination */

.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
}
.pager[hidden] { display: none; }

.page-numbers { display: flex; gap: 0.3rem; }

.page-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fg-1);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}
.page-btn:hover:not(:disabled) { color: var(--fg); border-color: var(--fg-2); }
.page-btn:disabled { opacity: 0.4; cursor: default; }

.page-numbers .page-btn { min-width: 2.1rem; text-align: center; padding: 0.35rem 0.5rem; }
.page-btn[aria-current="page"] {
  color: var(--brand);
  border-color: color-mix(in srgb, var(--brand) 50%, transparent);
  background: var(--brand-wash);
}

@media (max-width: 520px) {
  .pager { flex-wrap: wrap; justify-content: center; }
  .page-numbers { order: -1; width: 100%; justify-content: center; }
}

/* --------------------------------------------------------------- post page */

.article { max-width: var(--measure); margin: 0 auto; padding-top: clamp(2.5rem, 6vw, 4rem); }

.back-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--fg-2);
  margin-bottom: 1.5rem;
}
.back-link:hover { color: var(--brand); text-decoration: none; }
.back-link span { display: inline-block; transition: transform var(--fast); }
.back-link:hover span { transform: translateX(-3px); }

.article-head { padding-bottom: 1.75rem; border-bottom: 1px solid var(--line-soft); margin-bottom: 2rem; }
.article-head h1 { font-size: clamp(1.8rem, 1.35rem + 2.2vw, 2.6rem); margin: 0 0 0.75rem; }
.article-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.55rem;
  font-family: var(--font-mono); font-size: 0.79rem; color: var(--fg-2);
  margin-bottom: 0.85rem;
}
.article-meta .sep { opacity: 0.4; }

/* "Originally published on …" note under a republished post's title. */
.repost {
  margin: 0.9rem 0 0;
  padding: 0.5rem 0.8rem;
  font-size: 0.86rem;
  color: var(--fg-1);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-left: 2px solid var(--brand-2);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.toc {
  margin: 0 0 2.5rem;
  padding: 0.85rem 1.1rem;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-left: 2px solid var(--brand);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}
.toc summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.toc summary::marker { color: var(--fg-2); }
.toc ol { list-style: none; margin: 0.75rem 0 0.15rem; padding: 0; font-size: 0.9rem; }
.toc li { margin: 0.2rem 0; }
.toc li.lvl3 { padding-left: 1rem; }
.toc a { color: var(--fg-1); }
.toc a.current { color: var(--brand); }

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.9rem;
}
.post-nav a { max-width: 20rem; }

.share-row {
  display: flex; align-items: center; gap: 0.6rem;
  margin-top: 2.5rem; padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.85rem; color: var(--fg-2);
}
.share-row button {
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--fg-1); background: var(--bg-1);
  border: 1px solid var(--line); border-radius: var(--r-sm);
  padding: 0.3rem 0.65rem; cursor: pointer;
  transition: color var(--fast), border-color var(--fast);
}
.share-row button:hover { color: var(--brand); border-color: var(--brand); }

/* Small screens need deliberate breathing room after the SPA replaces the
   prerendered article, plus stacked controls where a horizontal row would wrap
   awkwardly or run out of space. */
@media (max-width: 640px) {
  :root { --gutter: 1rem; }

  .section-head { align-items: flex-start; flex-wrap: wrap; gap: 0.55rem 1rem; }
  .hero { padding-top: 3rem; }
  .hero-badge { max-width: 100%; font-size: 0.68rem; line-height: 1.35; }
  .hero h1 { font-size: clamp(2.15rem, 9vw, 2.8rem); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { padding: 1rem; }

  .project-grid,
  .vertical-grid { grid-template-columns: 1fr; }

  .article-wrap { padding-left: var(--gutter); padding-right: var(--gutter); }
  .article-head { margin-bottom: 1.5rem; }
  .article-meta { gap: 0.35rem; }
  .toc { margin-bottom: 1.75rem; padding: 0.8rem 0.9rem; }
  .prose { font-size: 1rem; }

  .share-row { flex-wrap: wrap; gap: 0.55rem; margin-top: 2rem; }
  .share-row > span { width: 100%; }
  .post-nav { flex-direction: column; gap: 0.9rem; margin-top: 2.5rem; }
  .post-nav a { max-width: none; }

  .palette-box { max-width: none; margin: min(12vh, 5rem) 1rem 0; }
  .palette-foot { display: none; }
}

@media (max-width: 360px) {
  .topbar-inner { gap: 0.45rem; padding-top: 0.6rem; padding-bottom: 0.6rem; }
  .brand { gap: 0.4rem; }
  .brand .dim { display: none; }
  .topbar-actions { gap: 0.1rem; }
  .icon-btn { padding-left: 0.38rem; padding-right: 0.38rem; }
}

/* ------------------------------------------------------------------- views */
/* Hidden until a real number arrives, so no zero flashes and no empty slot is
   left behind if the counter is unreachable. */

.views[hidden] { display: none; }
.view-sep[hidden] { display: none; }

/* ------------------------------------------------------------------- likes */

.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-1);
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 0.3rem 0.65rem;
  cursor: pointer;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}
.like-btn[hidden] { display: none; }
.like-btn:hover:not(:disabled) { color: var(--rose); border-color: var(--rose); }
.like-btn:disabled { opacity: 0.6; cursor: default; }
.like-btn svg {
  width: 15px; height: 15px;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
  transition: transform var(--fast);
}
.like-btn.on { color: var(--rose); border-color: color-mix(in srgb, var(--rose) 45%, transparent); }
.like-btn.on svg { fill: var(--rose); stroke: var(--rose); transform: scale(1.08); }
.like-count:empty { display: none; }
.article-meta .views { color: var(--fg-2); }
.post-row .views::before { content: "·"; margin: 0 0.4rem; opacity: 0.5; }

@media print { .views { display: none !important; } }

/* --------------------------------------------------------------------- ads */
/* Reserved height keeps the ad from shoving the article down when it loads,
   which is the usual cause of a bad CLS score on a blog. */

.ad-slot {
  display: block;
  margin: 2.25rem 0;
  padding: 0.55rem 0.7rem 0.7rem;
  min-height: 120px;
  background: var(--bg-1);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
}
.ad-slot[hidden] { display: none; }

.ad-label {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-2);
}

.ad-slot ins { display: block; min-height: 90px; }

/* Mid-article unit sits inside .prose, so pull it to the measure edges. */
.ad-in-article { margin: 2.5rem 0; }
.ad-after-post { margin-top: 2.5rem; }

@media (max-width: 640px) {
  .ad-slot { min-height: 260px; }   /* mobile units are taller */
  .ad-slot ins { min-height: 230px; }
}

/* ------------------------------------------------------------------- prose */

.prose { font-size: 1.05rem; }
.prose > :first-child { margin-top: 0; }

/* Headings are focus targets for in-page jumps; don't draw a box round them. */
.prose h2:focus, .prose h3:focus, .prose h4:focus { outline: none; }
.prose h2:focus-visible, .prose h3:focus-visible { outline: none; }

.prose h2 {
  font-size: 1.42rem;
  margin: 2.6rem 0 0.85rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 5rem;
}
.prose h3 { font-size: 1.16rem; margin: 2rem 0 0.6rem; scroll-margin-top: 5rem; }
.prose h4 { font-size: 1rem; margin: 1.6rem 0 0.5rem; color: var(--fg-1); }

.prose .anchor {
  margin-left: 0.4rem;
  color: var(--fg-2);
  font-weight: 400;
  opacity: 0;
  transition: opacity var(--fast);
}
.prose h2:hover .anchor, .prose h3:hover .anchor { opacity: 1; }

.prose p, .prose ul, .prose ol { margin: 0 0 1.2rem; }
.prose li { margin-bottom: 0.4rem; }
.prose li::marker { color: var(--fg-2); }
.prose strong { font-weight: 620; color: var(--fg); }

.prose blockquote {
  margin: 1.6rem 0;
  padding: 0.9rem 1.2rem;
  color: var(--fg-1);
  background: var(--brand-wash);
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.6rem 0; }

.prose img {
  display: block;
  margin: 1.75rem auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

/* ---------------------------------------------------- diagrams in posts --- */
/* Inline SVG so the diagram picks up the theme's CSS variables. It scrolls
   rather than shrinks on narrow screens, so labels stay readable. */

.prose .diagram {
  margin: 1.75rem 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-1);
}
.prose .diagram svg {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
  padding: 0.9rem;
}
.prose .diagram figcaption,
.prose figcaption {
  margin: 0;
  padding: 0 0.9rem 0.8rem;
  font-size: 0.84rem;
  color: var(--fg-2);
}

/* Diagram primitives, shared by every figure. */
.dg-box { fill: var(--bg); stroke: var(--line); stroke-width: 1.5; }
.dg-group { fill: none; stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 5 4; }
.dg-accent { fill: var(--brand-wash); stroke: var(--brand); stroke-width: 1.5; }
.dg-t { fill: var(--fg); font-size: 13px; font-weight: 550; }
.dg-s { fill: var(--fg-1); font-size: 11px; }
.dg-lbl { fill: var(--fg-2); font-size: 10.5px; font-family: var(--font-mono); letter-spacing: 0.02em; }
.dg-cap { fill: var(--fg-2); font-size: 11px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
.dg-line { stroke: var(--fg-2); stroke-width: 1.5; fill: none; }
.dg-line-d { stroke: var(--fg-2); stroke-width: 1.5; fill: none; stroke-dasharray: 4 4; opacity: 0.75; }
.dg-arrow { fill: var(--fg-2); }

.table-scroll { overflow-x: auto; margin: 1.6rem 0; border: 1px solid var(--line); border-radius: var(--r-md); }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.prose th, .prose td { text-align: left; padding: 0.6rem 0.85rem; border-bottom: 1px solid var(--line-soft); }
.prose thead th {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-2);
  background: var(--bg-1);
}
.prose tbody tr:last-child td { border-bottom: none; }
.prose tbody tr:hover { background: var(--bg-1); }

.prose sup a { font-size: 0.75em; padding: 0 0.15em; }
.footnotes { font-size: 0.9rem; color: var(--fg-1); }
.footnotes hr { margin-top: 3rem; }

/* -------------------------------------------------------------------- code */

code, kbd, samp { font-family: var(--font-mono); font-feature-settings: "liga" 0; }

.prose :not(pre) > code {
  font-size: 0.86em;
  color: var(--fg);
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.12em 0.36em;
}

.code-block {
  position: relative;
  margin: 1.7rem 0;
  background: var(--bg-code);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 0.75rem 0.45rem 0.9rem;
  background: var(--bg-1);
  border-bottom: 1px solid var(--line);
}
.code-lang {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-2);
}
.code-copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg-2);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  padding: 0.15rem 0.45rem;
  cursor: pointer;
  transition: color var(--fast), border-color var(--fast);
}
.code-copy:hover { color: var(--fg); border-color: var(--line); }
.code-copy.done { color: var(--teal); }

.code-block pre { margin: 0; padding: 0.95rem 1rem; overflow-x: auto; }
.code-block code { font-size: 0.845rem; line-height: 1.6; background: none; border: none; padding: 0; tab-size: 2; }

/* highlight.js tokens — theme-aware */
.hljs-comment, .hljs-quote { color: var(--fg-2); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-doctag { color: var(--rose); }
.hljs-string, .hljs-meta .hljs-string, .hljs-regexp { color: var(--teal); }
.hljs-title, .hljs-title.function_, .hljs-section { color: var(--brand-2); }
.hljs-title.class_, .hljs-class .hljs-title, .hljs-type { color: var(--amber); }
.hljs-number, .hljs-symbol, .hljs-bullet { color: var(--brand); }
.hljs-attr, .hljs-attribute, .hljs-variable, .hljs-template-variable { color: var(--fg); }
.hljs-built_in, .hljs-builtin-name { color: var(--brand); }
.hljs-params { color: var(--fg-1); }
.hljs-meta { color: var(--fg-2); }
.hljs-deletion { color: var(--rose); }
.hljs-addition { color: var(--teal); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 600; }

/* ------------------------------------------------------------------ about */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}
@media (max-width: 820px) { .about-grid { grid-template-columns: 1fr; } }

/* Small stacked cards in the About sidebar — education, contact. */
.side-card {
  padding: 1.05rem 1.2rem;
  margin-bottom: 0.85rem;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.side-card h3 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-2);
  margin: 0 0 0.6rem;
}
.side-card p { margin: 0; font-size: 0.94rem; line-height: 1.55; }
.side-card p span { color: var(--fg-1); font-size: 0.9rem; }
.side-links { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 0.7rem; font-size: 0.88rem; }

/* Toolkit — one card per skill group, full width below the bio. */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
}

.skill-group {
  padding: 1.05rem 1.15rem 1.15rem;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: border-color var(--fast), transform var(--fast);
}
.skill-group:hover { border-color: var(--fg-2); transform: translateY(-2px); }
.skill-group h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--brand);
  margin: 0 0 0.7rem;
}

.timeline { position: relative; padding-left: 1.6rem; }
.timeline::before {
  content: "";
  position: absolute;
  left: 5px; top: 0.5rem; bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(var(--brand), var(--line) 60%, transparent);
}
.tl-item { position: relative; padding-bottom: 1.9rem; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -1.6rem; top: 0.55rem;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--brand);
  transition: box-shadow var(--fast);
}
.tl-item:hover::before { box-shadow: 0 0 0 4px var(--brand-wash); }
.tl-period { font-family: var(--font-mono); font-size: 0.75rem; color: var(--fg-2); }
.tl-item h3 { margin: 0.15rem 0 0.5rem; font-size: 1.04rem; }
.tl-item h3 .at { color: var(--fg-1); font-weight: 400; }
.tl-item ul { margin: 0; padding-left: 1.1rem; color: var(--fg-1); font-size: 0.92rem; }

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

.footer { margin-top: clamp(4rem, 9vw, 7rem); border-top: 1px solid var(--line-soft); }
.footer-inner {
  max-width: var(--page);
  margin: 0 auto;
  padding: 2.25rem var(--gutter);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}
.footer-social { display: flex; gap: 0.4rem; }
.footer-social a {
  display: grid; place-items: center;
  width: 34px; height: 34px;
  color: var(--fg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: color var(--fast), border-color var(--fast), transform var(--fast), background var(--fast);
}
.footer-social a:hover {
  color: var(--brand); border-color: var(--brand);
  background: var(--brand-wash);
  transform: translateY(-2px);
}
.footer-social svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.footer-social svg.filled { fill: currentColor; stroke: none; }
.footer-note { margin: 0; font-size: 0.82rem; color: var(--fg-2); }

/* -------------------------------------------------------- command palette */

.palette { position: fixed; inset: 0; z-index: 60; }
.palette[hidden] { display: none; }
.palette-backdrop {
  position: absolute; inset: 0;
  background: rgba(3, 6, 12, 0.6);
  backdrop-filter: blur(3px);
  animation: fade 0.15s var(--ease);
}
@keyframes fade { from { opacity: 0; } }

.palette-box {
  position: relative;
  max-width: 560px;
  margin: min(14vh, 7rem) auto 0;
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: 0 30px 70px -25px rgba(0, 0, 0, 0.7);
  overflow: hidden;
  animation: rise 0.22s var(--ease);
}
@keyframes rise { from { opacity: 0; transform: translateY(-10px) scale(0.985); } }

.palette-input-row { display: flex; align-items: center; gap: 0.6rem; padding: 0.85rem 1rem; border-bottom: 1px solid var(--line); }
.palette-icon { width: 17px; height: 17px; flex: none; fill: none; stroke: var(--fg-2); stroke-width: 1.8; stroke-linecap: round; }
#palette-input { flex: 1; font: inherit; font-size: 0.98rem; color: var(--fg); background: none; border: none; outline: none; }
#palette-input::placeholder { color: var(--fg-2); }

.palette-results { list-style: none; margin: 0; padding: 0.4rem; max-height: min(52vh, 380px); overflow-y: auto; }
.palette-results li a {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.55rem 0.7rem;
  border-radius: var(--r-sm);
  color: var(--fg);
}
.palette-results li a:hover { text-decoration: none; }
.palette-results li[aria-selected="true"] a { background: var(--brand-wash); }
.p-kind {
  font-family: var(--font-mono); font-size: 0.62rem;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--fg-2); border: 1px solid var(--line);
  border-radius: 4px; padding: 0.1rem 0.35rem; flex: none;
}
.p-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 0.92rem; }
.palette-empty { padding: 1.5rem 0.7rem; text-align: center; color: var(--fg-2); font-size: 0.9rem; }
.palette-foot {
  display: flex; gap: 1rem; justify-content: flex-end;
  padding: 0.5rem 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.72rem; color: var(--fg-2);
}
.palette-foot kbd { margin-right: 0.2rem; }

/* -------------------------------------------------------- reveal on scroll */

.reveal { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }

/* ---------------------------------------------------------------- loading */

.route-loading { display: grid; place-items: center; min-height: 60vh; }
.spinner {
  width: 22px; height: 22px;
  border: 2px solid var(--line);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  bottom: 1.4rem; left: 50%;
  transform: translate(-50%, 1.5rem);
  z-index: 70;
  padding: 0.55rem 1rem;
  font-size: 0.87rem;
  color: var(--fg);
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  box-shadow: var(--card-shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--fast), transform var(--fast);
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ---------------------------------------------------------- a11y / print */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .topbar, .footer, .palette, .progress, .code-copy, .share-row, .post-nav, .filters,
  .ad-slot, .pager { display: none !important; }
  body { background: #fff; color: #000; font-size: 11pt; }
  body::before { display: none; }
}