/* ---------------------------------------------------------------
   Fei Xiao — portfolio
   One typeface, three sizes, warm ground, centered column.
   Swap --font to change the whole system.
   --------------------------------------------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400..700;1,400..700&display=swap');

:root {
  --font: 'Instrument Sans', ui-sans-serif, -apple-system, BlinkMacSystemFont,
    'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  --ground: #fcfbf9;
  --panel: #f4f1ec;
  --ink: #15140f;
  --ink-soft: #57544c;
  --ink-mute: #8a857a;
  --rule: #e6e1d8;
  --accent: #9c4221;

  --step-display: clamp(2.125rem, 1.4rem + 3.1vw, 3.25rem);
  --step-lead: clamp(1.1875rem, 1.1rem + 0.4vw, 1.4375rem);
  --step-body: 1.0625rem;
  --step-small: 0.875rem;

  --col: 38rem;
  --col-wide: 54rem;
  --gutter: 1.5rem;

  --space-s: 0.75rem;
  --space-m: 1.75rem;
  --space-l: 4rem;
  --space-xl: 7rem;
}

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

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--step-body);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
video { display: block; max-width: 100%; height: auto; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.shell {
  width: 100%;
  max-width: var(--col-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.col {
  width: 100%;
  max-width: var(--col);
  margin-inline: auto;
}

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

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-m);
  flex-wrap: wrap;
  padding-block: 2rem 0;
}

.masthead__name {
  font-size: var(--step-body);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.25rem;
  font-size: var(--step-small);
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav a:hover { color: var(--ink); }

/* --- intro ----------------------------------------------------- */

.intro { padding-block: var(--space-xl) var(--space-l); }

.intro h1 {
  font-size: var(--step-display);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.04;
  margin: 0 0 var(--space-m);
}

.intro p {
  font-size: var(--step-lead);
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: var(--ink-soft);
  margin: 0 0 1.125rem;
  max-width: 34rem;
  text-wrap: pretty;
}

.intro p:first-of-type { color: var(--ink); }

/* --- feed ------------------------------------------------------ */

.feed {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  padding-block: var(--space-l) var(--space-xl);
}

.entry {
  display: block;
  text-decoration: none;
  color: inherit;
}

.entry__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.4rem;
}

.entry__name {
  font-size: 1.1875rem;
  font-weight: 600;
  letter-spacing: -0.017em;
  margin: 0;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  transition: text-decoration-color 0.18s ease;
}

.entry:hover .entry__name { text-decoration-color: var(--ink-mute); }

.entry__role {
  font-size: var(--step-small);
  color: var(--ink-mute);
}

.entry__summary {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
  max-width: 32rem;
  text-wrap: pretty;
}

/* --- media ----------------------------------------------------- */

.frame {
  margin: 0;
  background: var(--panel);
  border-radius: 10px;
  overflow: hidden;
}

.frame > img,
.frame > video {
  width: 100%;
  display: block;
}

.frame--pad {
  padding: 1.75rem;
}

/* Device mock — a plain bezel so the screen reads as a phone, nothing more. */
.phone {
  max-width: 17.5rem;
  margin-inline: auto;
  padding: 0.5rem;
  background: #15140f;
  border-radius: 2.25rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18), 0 12px 28px rgba(0, 0, 0, 0.12);
}

.phone > img,
.phone > video {
  width: 100%;
  display: block;
  border-radius: 1.75rem;
}

.shot figcaption,
.caption {
  font-size: 0.8125rem;
  line-height: 1.45;
  letter-spacing: 0.005em;
  color: var(--ink-mute);
  margin-top: 0.75rem;
  max-width: 30rem;
  text-wrap: pretty;
}

figure.shot { margin: 0 0 var(--space-m); }

.missing {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 10;
  background: var(--panel);
  border: 1px dashed var(--rule);
  border-radius: 10px;
  color: var(--ink-mute);
  font-size: var(--step-small);
  text-align: center;
  padding: 1.5rem;
}

/* --- project page ---------------------------------------------- */

.back {
  display: inline-block;
  font-size: var(--step-small);
  color: var(--ink-mute);
  text-decoration: none;
  padding-block: 2rem 0;
  transition: color 0.15s ease;
}

.back:hover { color: var(--ink); }

.project__head { padding-block: var(--space-l) var(--space-m); }

.project__name {
  font-size: var(--step-display);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 1.05;
  margin: 0 0 0.75rem;
}

.project__summary {
  font-size: var(--step-lead);
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  max-width: 32rem;
  text-wrap: pretty;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  font-size: var(--step-small);
  color: var(--ink-mute);
  padding-bottom: var(--space-m);
  border-bottom: 1px solid var(--rule);
}

.detail { padding-block: var(--space-m) var(--space-l); }

.detail section { margin-bottom: var(--space-m); }

.detail h2 {
  font-size: var(--step-small);
  font-weight: 500;
  color: var(--ink-mute);
  margin: 0 0 0.4rem;
  letter-spacing: 0.01em;
}

.detail p {
  margin: 0;
  text-wrap: pretty;
}

.gallery { padding-block: var(--space-m) var(--space-l); }

/* Bracketed placeholders — visible on purpose until the copy lands. */
.todo {
  color: var(--accent);
  background: rgba(156, 66, 33, 0.06);
  border-left: 2px solid rgba(156, 66, 33, 0.35);
  padding: 0.6rem 0.85rem;
  border-radius: 0 4px 4px 0;
  display: block;
  font-size: 0.9375rem;
}

.todo-inline {
  background: rgba(156, 66, 33, 0.09);
  color: var(--accent);
  border-radius: 3px;
  padding: 0.05em 0.3em;
}

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

.pager {
  display: flex;
  justify-content: space-between;
  gap: var(--space-m);
  border-top: 1px solid var(--rule);
  padding-block: var(--space-m) var(--space-l);
  font-size: var(--step-small);
}

.pager a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s ease;
}

.pager a:hover { color: var(--ink); }

.pager span { display: block; color: var(--ink-mute); margin-bottom: 0.15rem; }
.pager strong { font-weight: 600; color: var(--ink); }
.pager .next { text-align: right; margin-left: auto; }

/* --- about + footer -------------------------------------------- */

.about {
  border-top: 1px solid var(--rule);
  padding-block: var(--space-l);
}

.about h2 {
  font-size: var(--step-small);
  font-weight: 500;
  color: var(--ink-mute);
  margin: 0 0 var(--space-s);
}

.about p {
  margin: 0 0 var(--space-m);
  max-width: 32rem;
  text-wrap: pretty;
}

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-size: var(--step-body);
}

.contact a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--rule);
  transition: text-decoration-color 0.18s ease;
}

.contact a:hover { text-decoration-color: var(--ink); }

.foot {
  border-top: 1px solid var(--rule);
  padding-block: var(--space-m) var(--space-l);
  font-size: var(--step-small);
  color: var(--ink-mute);
}

/* --- motion ----------------------------------------------------- */

.rise {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.rise.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .rise { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* --- small screens ---------------------------------------------- */

@media (max-width: 34rem) {
  :root {
    --gutter: 1.25rem;
    --space-xl: 4.5rem;
    --space-l: 2.75rem;
  }

  .frame--pad { padding: 1rem; }
  .pager { flex-direction: column; gap: 1.25rem; }
  .pager .next { text-align: left; margin-left: 0; }
}