/* ============================================================
   Yuancheng Yang — portfolio
   Shared styles, tokens & type system
   ============================================================ */

/* --- Self-hosted licensed fonts (no external dependency) --- */
@font-face {
  font-family: "Instrument Serif";
  src: url("fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Instrument Serif";
  src: url("fonts/InstrumentSerif-Italic.ttf") format("truetype");
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: "Neue Haas Display";
  src: url("fonts/NeueHaasDisplay-Light.ttf") format("truetype");
  font-weight: 300; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Neue Haas Display";
  src: url("fonts/NeueHaasDisplay-Roman.ttf") format("truetype");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Neue Haas Display";
  src: url("fonts/NeueHaasDisplay-Medium.ttf") format("truetype");
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Neue Haas Display";
  src: url("fonts/NeueHaasDisplay-Bold.ttf") format("truetype");
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Aeonik Fono";
  src: url("fonts/AeonikFono-Regular.otf") format("opentype");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Aeonik Fono";
  src: url("fonts/AeonikFono-Medium.otf") format("opentype");
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Noto Serif";
  src: url("fonts/NotoSerif-SemiBold.ttf") format("truetype");
  font-weight: 600; font-style: normal; font-display: swap;
}

:root {
  /* palette pulled directly from the Figma file */
  --bg: #000000;
  --fg: #c4bfb4;              /* warm beige — primary text */
  --fg-dim: rgba(196, 191, 180, 0.55);
  --fg-faint: rgba(196, 191, 180, 0.32);
  --line: rgba(196, 191, 180, 0.9);
  --panel: #d9d9d9;          /* image placeholder grey */
  --hero-veil: rgba(217, 217, 217, 0.5);

  /* type stacks — self-hosted licensed faces */
  --serif: "Instrument Serif", ui-serif, Georgia, "Times New Roman", serif;
  --grotesk: "Neue Haas Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "Aeonik Fono", ui-monospace, "SF Mono", Menlo, monospace;

  /* fluid horizontal page margin: 160px on a 1440 canvas */
  --gutter: clamp(20px, 11.1vw, 160px);
  --maxw: 1440px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; overflow-x: clip; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--grotesk);
  font-weight: 500;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

::selection { background: var(--fg); color: #000; }

a { color: inherit; text-decoration: none; }

/* inline text hyperlinks (bio, news) — visibly underlined, jumps out to the site */
.ilink {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  text-decoration-color: var(--fg-dim);
  transition: text-decoration-color .2s, opacity .2s;
}
.ilink:hover { text-decoration-color: var(--fg); opacity: .75; }

img { display: block; max-width: 100%; }

.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* --- shared label / mono treatments --- */
.eyebrow {
  font-family: var(--mono);
  font-weight: 400;
  font-size: clamp(12px, 1.05vw, 16px);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--fg);
}

.hrule {
  height: 0;
  border: none;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ============================================================
   Shared site chrome — contact items, footer, mobile dock
   (used by home + every case-study page)
   ============================================================ */
.contact-item { display: flex; flex-direction: column; gap: 4px; }
.contact-item .lbl { font-family: var(--mono); font-weight: 400; font-size: 13px; color: var(--fg-dim); letter-spacing: .02em; }
.contact-item a { font-size: clamp(13px, 1vw, 15px); transition: opacity .2s; }
.contact-item a:hover { opacity: .6; }

.foot {
  border-top: 1px solid var(--fg-faint);
  padding-block: clamp(40px, 5vw, 72px) clamp(40px, 5vw, 64px);
  display: flex; flex-wrap: wrap; gap: 32px 64px;
  align-items: flex-end; justify-content: space-between;
}
.foot__contact { display: flex; flex-wrap: wrap; gap: 28px 56px; }
.foot__name { font-family: var(--serif); font-size: clamp(24px, 2.4vw, 34px); line-height: 1; text-align: right; }
.foot__copy { font-family: var(--mono); font-size: 12px; color: var(--fg-dim); letter-spacing: .03em; }

.dock { display: none; }

@media (max-width: 760px) {
  .foot { padding-bottom: 110px; }
  .dock {
    display: grid; grid-template-columns: 1fr 1fr;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
    background: rgba(0,0,0,.82);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--fg-faint);
  }
  .dock a {
    padding: 16px 8px; text-align: center;
    font-family: var(--mono); font-size: 13px; letter-spacing: .04em;
    text-transform: uppercase; color: var(--fg);
    display: flex; align-items: center; justify-content: center; gap: 8px;
  }
  .dock a:first-child { border-right: 1px solid var(--fg-faint); }
  .dock a:active { background: rgba(196,191,180,.1); }
}