/* ==========================================================================
   Krish Tandon — CS180/280A portfolio
   Shared stylesheet. Imported absolutely from every page: href="/style.css"
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@400;500;600&display=swap');

:root {
  --bg:        #f7f5f1;
  --bg-raised: #ffffff;
  --bg-sunken: #efece6;
  --text:      #17161a;
  --text-soft: #55524d;
  --text-mute: #85817a;
  --rule:      #e0dcd4;
  --accent:    #003262;  /* Berkeley Blue  */
  --gold:      #d99b0a;  /* California Gold, dimmed for contrast */
  --shadow:    0 1px 2px rgba(23,22,26,.05), 0 12px 32px -12px rgba(23,22,26,.16);

  --serif: 'Instrument Serif', ui-serif, Georgia, 'Times New Roman', serif;
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:  ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;

  --measure: 66ch;
  --wide:    1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #131215;
    --bg-raised: #1c1b1f;
    --bg-sunken: #0d0c0f;
    --text:      #ece9e3;
    --text-soft: #b3aea6;
    --text-mute: #857f76;
    --rule:      #302e33;
    --accent:    #8ab4dd;
    --gold:      #f0b429;
    --shadow:    0 1px 2px rgba(0,0,0,.4), 0 12px 32px -12px rgba(0,0,0,.7);
  }
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.wrap  { width: min(100% - 2.5rem, var(--wide)); margin-inline: auto; }
.prose { max-width: var(--measure); }

section { padding-block: clamp(3rem, 7vw, 5.5rem); }
section + section { border-top: 1px solid var(--rule); }

/* ---------- type ---------- */

h1, h2, h3 { font-family: var(--serif); font-weight: 400; letter-spacing: -.01em; line-height: 1.1; }

h1 { font-size: clamp(2.75rem, 7vw, 4.5rem); margin: 0; }
h2 { font-size: clamp(2rem, 4.5vw, 2.9rem); margin: 0 0 .6rem; }
h3 { font-size: 1.35rem; margin: 2.5rem 0 .5rem; font-family: var(--sans); font-weight: 600; letter-spacing: -.005em; }

p { margin: 0 0 1.15rem; color: var(--text-soft); }
p strong, li strong { color: var(--text); font-weight: 600; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--gold); }

.eyebrow {
  font-family: var(--sans);
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin: 0 0 1rem;
}

.lede { font-size: 1.16rem; color: var(--text-soft); }
.lede em { font-family: var(--serif); font-style: italic; font-size: 1.2em; color: var(--text); }

/* ---------- header / nav ---------- */

.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  display: flex; align-items: center; gap: 1.5rem;
  min-height: 58px; flex-wrap: wrap;
}
.brand {
  font-family: var(--serif); font-size: 1.2rem; color: var(--text);
  text-decoration: none; margin-right: auto; white-space: nowrap;
}
.brand:hover { color: var(--accent); }
.topnav { display: flex; gap: 1.35rem; flex-wrap: wrap; }
.topnav a {
  font-size: .88rem; font-weight: 500; color: var(--text-soft);
  text-decoration: none; padding-block: .25rem;
  border-bottom: 2px solid transparent;
}
.topnav a:hover { color: var(--text); border-bottom-color: var(--gold); }

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

.hero { padding-block: clamp(3.5rem, 10vw, 7rem) clamp(2.5rem, 6vw, 4rem); }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero .lede { margin-top: 1.5rem; max-width: 58ch; }
.meta {
  display: flex; flex-wrap: wrap; gap: .5rem .75rem;
  margin-top: 2rem; padding: 0; list-style: none;
}
.meta li {
  font-family: var(--mono); font-size: .76rem; letter-spacing: .02em;
  color: var(--text-soft); background: var(--bg-raised);
  border: 1px solid var(--rule); border-radius: 999px; padding: .3rem .8rem;
}

/* ---------- figures ---------- */

.pair {
  display: grid; gap: 1.5rem; margin: 2.25rem 0 0;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

figure { margin: 0; }

.shot {
  display: block; position: relative;
  background: var(--bg-sunken);
  border: 1px solid var(--rule); border-radius: 10px;
  overflow: hidden; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}
.shot:hover { transform: translateY(-2px); box-shadow: 0 1px 2px rgba(23,22,26,.06), 0 20px 44px -14px rgba(23,22,26,.28); }
.shot img {
  display: block; width: 100%; height: clamp(240px, 42vh, 440px);
  object-fit: cover; object-position: center;
}
.shot--tall img { height: clamp(280px, 56vh, 560px); object-fit: contain; background: var(--bg-sunken); }

.tag {
  position: absolute; top: .7rem; left: .7rem;
  font-family: var(--mono); font-size: .68rem; letter-spacing: .06em; text-transform: uppercase;
  padding: .28rem .6rem; border-radius: 5px;
  background: rgba(10,10,12,.72); color: #fff;
  backdrop-filter: blur(6px);
}
.tag--good { background: rgba(0,86,44,.82); }
.tag--bad  { background: rgba(122,32,20,.82); }

figcaption {
  margin-top: .8rem; font-size: .9rem; line-height: 1.55; color: var(--text-soft);
}
figcaption b { color: var(--text); font-weight: 600; }
figcaption .exif {
  display: block; margin-top: .3rem;
  font-family: var(--mono); font-size: .74rem; color: var(--text-mute);
}

/* ---------- callout ---------- */

.why {
  margin-top: 2.5rem; padding: 1.5rem 1.6rem;
  background: var(--bg-raised); border: 1px solid var(--rule);
  border-left: 3px solid var(--gold); border-radius: 8px;
  max-width: var(--measure);
}
.why h3 { margin-top: 0; font-size: 1.05rem; }
.why p:last-child { margin-bottom: 0; }
.why .math {
  font-family: var(--mono); font-size: .88rem;
  background: var(--bg-sunken); border: 1px solid var(--rule);
  border-radius: 6px; padding: .7rem .9rem; margin: 1rem 0;
  color: var(--text); overflow-x: auto;
}

/* ---------- dolly zoom ---------- */

.gif-stage {
  margin: 2.5rem auto 0; max-width: 600px;
  border: 1px solid var(--rule); border-radius: 12px;
  overflow: hidden; box-shadow: var(--shadow); background: var(--bg-sunken);
}
.gif-stage img { display: block; width: 100%; height: auto; }

.contact-sheet {
  display: grid; gap: .75rem; margin-top: 2rem;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
}
.contact-sheet a {
  display: block; border: 1px solid var(--rule); border-radius: 7px;
  overflow: hidden; background: var(--bg-sunken); position: relative;
}
.contact-sheet img { display: block; width: 100%; aspect-ratio: 3/4; object-fit: cover; }
.contact-sheet .n {
  position: absolute; bottom: 0; right: 0;
  font-family: var(--mono); font-size: .66rem; color: #fff;
  background: rgba(10,10,12,.7); padding: .15rem .4rem; border-radius: 5px 0 0 0;
}

/* ---------- project cards (home) ---------- */

.cards {
  display: grid; gap: 1.1rem; margin-top: 2.5rem;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}
.card {
  display: flex; flex-direction: column; gap: .4rem;
  padding: 1.4rem 1.5rem; text-decoration: none;
  background: var(--bg-raised); border: 1px solid var(--rule);
  border-radius: 10px; color: inherit;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.card .num {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .1em;
  color: var(--text-mute); text-transform: uppercase;
}
.card .name { font-family: var(--serif); font-size: 1.45rem; line-height: 1.15; color: var(--text); }
.card .blurb { font-size: .9rem; color: var(--text-soft); margin: 0; }
.card .go { margin-top: .5rem; font-size: .85rem; font-weight: 500; color: var(--accent); }
.card--soon { opacity: .5; }
.card--soon .go { color: var(--text-mute); }

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

footer {
  border-top: 1px solid var(--rule);
  padding-block: 2.5rem 3.5rem;
  font-size: .88rem; color: var(--text-mute);
}
footer .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ---------- misc ---------- */

.backlink {
  display: inline-block; margin-bottom: 1.75rem;
  font-size: .88rem; font-weight: 500; text-decoration: none; color: var(--text-soft);
}
.backlink:hover { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- narrow screens: keep the sticky header compact ---------- */

@media (max-width: 620px) {
  html { scroll-padding-top: 72px; }

  .topbar-inner { min-height: 0; gap: .35rem; padding-block: .5rem; }
  .brand { font-size: 1.05rem; margin-right: 0; width: 100%; }

  .topnav {
    width: 100%;
    gap: .9rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .topnav::-webkit-scrollbar { display: none; }
  .topnav a { font-size: .8rem; white-space: nowrap; padding-block: .1rem; }

  .why { padding: 1.15rem 1.2rem; }
  .contact-sheet { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: .55rem; }
  .meta li { font-size: .7rem; padding: .25rem .65rem; }
}

/* ---------- print: the Gradescope PDF is a print of this page ---------- */

@media print {
  /* force the light palette regardless of the OS theme */
  :root {
    --bg: #fff; --bg-raised: #fff; --bg-sunken: #fff;
    --text: #000; --text-soft: #222; --text-mute: #555;
    --rule: #bbb; --accent: #003262; --gold: #a37200; --shadow: none;
  }

  body { font-size: 11pt; line-height: 1.45; background: #fff; }

  /* a sticky bar would stamp itself over the first page */
  .topbar { position: static; border-bottom: 1px solid var(--rule); backdrop-filter: none; }
  .topnav, .backlink { display: none; }

  section { padding-block: 1.1rem; break-inside: auto; }
  .hero { padding-block: .5rem 1rem; }
  h1 { font-size: 28pt; }
  h2 { font-size: 18pt; }

  /* keep a photo and its caption on the same page */
  figure, .why, .gif-stage { break-inside: avoid; page-break-inside: avoid; }
  h2, h3 { break-after: avoid; page-break-after: avoid; }

  .pair { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .shot { box-shadow: none; }
  .shot img, .shot--tall img { height: auto; max-height: 3.4in; object-fit: contain; }
  .gif-stage { max-width: 3.6in; }
  .contact-sheet { grid-template-columns: repeat(4, 1fr); }

  a { color: var(--accent); text-decoration: none; }
  .tag { background: #333 !important; color: #fff !important; }
  .tag--good { background: #14532d !important; }
  .tag--bad  { background: #7a2014 !important; }
}