/* =========================================================
   Components. Each block is reusable on any page.
   Uses tokens only (see tokens.css).
   ========================================================= */

/* ---------- Buttons: minimal ----------
   .btn            base
   .btn--solid     one primary action per view
   .btn--line      quiet secondary action
   .btn--sm        compact (header) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  min-height: 2.75rem;
  padding: 0 var(--s-5);
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  font-size: var(--fs-14);
  font-weight: var(--fw-medium);
  letter-spacing: 0.005em;
  white-space: nowrap;
  transition: background-color var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out);
}
.btn--solid { background: var(--btn-solid-bg); color: var(--btn-solid-fg); }
.btn--solid:hover { background: var(--btn-solid-hover); }
.btn--line { color: var(--btn-line-fg); border-color: var(--btn-line-border); background: transparent; }
.btn--line:hover { border-color: var(--btn-line-hover); }
.btn--sm { min-height: 2.25rem; padding: 0 var(--s-4); }

/* Text link with a quiet underline */
.link {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
  transition: text-decoration-color var(--t-fast) var(--ease-out);
}
.link:hover { text-decoration-color: currentColor; }

/* ---------- Pill badge (above hero headline) ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-1) var(--s-4) var(--s-1) var(--s-2);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  font-size: var(--fs-14);
  color: var(--text-muted);
  background: var(--bg);
}
@media (max-width: 420px) { .badge { font-size: var(--fs-12); } }
.badge__dot {
  width: 0.5rem; height: 0.5rem;
  border-radius: 50%;
  background: var(--accent-mark);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-base) var(--ease-out);
}
.site-header.is-scrolled { border-bottom-color: var(--border); }
.site-header__row {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-5);
  min-height: 4rem;
}
.brand { font-size: var(--fs-16); font-weight: var(--fw-semibold); letter-spacing: -0.01em; }
.brand span { color: var(--text-faint); font-weight: var(--fw-regular); }
.nav { display: flex; gap: var(--s-6); font-size: var(--fs-14); color: var(--text-muted); }
.nav a:hover { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: var(--s-3); }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 2px;
  font-size: var(--fs-12);
}
.lang-switch button {
  min-width: 2.25rem; min-height: 1.875rem;
  border-radius: calc(var(--r-sm) - 2px);
  color: var(--text-muted);
}
.lang-switch button[aria-pressed="true"] { background: var(--surface); color: var(--text); font-weight: var(--fw-medium); }

@media (max-width: 860px) { .nav { display: none; } }
@media (max-width: 420px) { .header-actions .btn { display: none; } }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(3rem, 2rem + 4vw, 5.5rem); text-align: center; }
.hero__inner { display: grid; justify-items: center; gap: var(--s-5); }
.hero__title { max-width: 14ch; }
html[data-lang="zh"] .hero__title { max-width: none; }
.hero__lead { margin-inline: auto; }
.hero__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-3); margin-top: var(--s-2); }

/* ---------- Film frame + annotations (the one signature element) ---------- */
.film {
  position: relative;
  margin-top: clamp(2.5rem, 1.5rem + 4vw, 4.5rem);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--media-bg);
  aspect-ratio: 16 / 9;
  isolation: isolate;
}
.film__video, .film__lines {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
.film__video { object-fit: cover; }
.film__lines { pointer-events: none; }
.film__lines line { stroke: var(--leader); stroke-width: 1; vector-effect: non-scaling-stroke; }
.film__lines circle { fill: var(--c-paper); }
.film__lines .ring { fill: none; stroke: var(--leader); stroke-width: 1; vector-effect: non-scaling-stroke; }

.chip {
  position: absolute;
  display: grid; gap: 2px;
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--glass-text);
  box-shadow: var(--shadow-chip);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  text-align: left;
  font-size: var(--fs-14);
  line-height: 1.35;
}
.chip__title { font-weight: var(--fw-medium); display: flex; align-items: center; gap: var(--s-2); }
.chip__sub { color: var(--text-muted); font-size: var(--fs-12); }
.chip__dot { width: 0.4rem; height: 0.4rem; border-radius: 50%; background: var(--accent-mark); }

/* Positions match the SVG leader lines (video is 1600 x 900) */
.chip--a { right: 77.5%; top: 31%; }
.chip--b { left: 77.5%; top: 74%; }

/* Phones: the frame becomes portrait (shows the original footage), chips stack at the bottom */
@media (max-width: 720px) {
  .film { aspect-ratio: 4 / 5; border-radius: var(--r-md); margin-inline: calc(var(--gutter) * -0.5); }
  .film__lines { display: none; }
  .chip { position: static; }
  .film__chips {
    position: absolute; left: var(--s-3); right: var(--s-3); bottom: var(--s-3);
    display: flex; flex-wrap: wrap; gap: var(--s-2);
  }
}

/* One orchestrated load sequence: headline, then film, then annotations.
   Pure CSS (runs even if site.js fails); every element ends fully visible. */
@keyframes ccs-rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes ccs-unmask { from { clip-path: inset(6% 4% 0 4% round var(--r-lg)); } to { clip-path: inset(0 0 0 0 round var(--r-lg)); } }
@keyframes ccs-draw { from { stroke-dashoffset: 600; } to { stroke-dashoffset: 0; } }
@keyframes ccs-fade { from { opacity: 0; } to { opacity: 1; } }
.js .hero [data-seq] { animation: ccs-rise var(--t-slow) var(--ease-out) both; }
.js .hero [data-seq="1"] { animation-delay: 110ms; }
.js .hero [data-seq="2"] { animation-delay: 220ms; }
.js .hero [data-seq="3"] { animation-delay: 330ms; }
.js .hero .film { animation: ccs-unmask 1.2s var(--ease-out) 0.35s both; }
.js .film__lines line { stroke-dasharray: 600; animation: ccs-draw 1s var(--ease-out) 1.3s both; }
.js .hero .chip, .js .film__lines circle { animation: ccs-fade 0.6s var(--ease-out) 1.6s both; }

/* Pause / play for the looping film (motion over 5s must be stoppable) */
.film__toggle {
  position: absolute; right: var(--s-4); bottom: var(--s-4);
  width: 2.25rem; height: 2.25rem;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--glass-text);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  opacity: 0.85;
  transition: opacity var(--t-fast) var(--ease-out);
}
.film__toggle:hover { opacity: 1; }
.film__toggle svg { fill: currentColor; }
.film__toggle > span { display: grid; place-items: center; }
@media (max-width: 720px) { .film__toggle { right: var(--s-3); bottom: var(--s-3); } .film__chips { right: 3.5rem !important; } }

/* ---------- Work (uneven editorial layout, not a card grid) ---------- */
.work {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-7) var(--s-5);
}
.case { display: grid; gap: var(--s-4); align-content: start; }
.case__media { border-radius: var(--r-md); overflow: hidden; background: var(--surface); }
.case__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; }
.case__text { display: grid; gap: var(--s-2); }
.case--lead { grid-column: 1 / span 7; }
.case--lead .case__media img { aspect-ratio: 5 / 4; }
.case--side { grid-column: 9 / span 4; align-self: end; }
.case--mid  { grid-column: 2 / span 5; }
.case--home { grid-column: 8 / span 5; margin-top: var(--s-9); }
.case__stat { color: var(--text); font-weight: var(--fw-medium); }

.note {
  margin-top: var(--s-8);
  padding-top: var(--s-5);
  border-top: 1px solid var(--border);
  max-width: var(--container-narrow);
}

@media (max-width: 860px) {
  .work { grid-template-columns: 1fr 1fr; gap: var(--s-7) var(--s-4); }
  .case--lead { grid-column: 1 / -1; }
  .case--side, .case--mid, .case--home { grid-column: auto; margin-top: 0; align-self: start; }
}
@media (max-width: 560px) {
  .work { grid-template-columns: 1fr; }
}

/* ---------- Steps (a real sequence, so numbers are earned) ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-5);
  counter-reset: step;
  position: relative;
}
.steps::before {
  content: ""; position: absolute; left: 0; right: 0; top: 1.25rem;
  height: 1px; background: var(--border);
}
.step { position: relative; display: grid; grid-template-rows: auto auto 1fr; align-content: start; gap: var(--s-3); padding-right: var(--s-4); }
.step__num {
  width: 2.5rem; height: 2.5rem;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  font-size: var(--fs-14);
  font-weight: var(--fw-medium);
  color: var(--accent);
  position: relative;
  margin-bottom: var(--s-3);
}
.section--surface .step__num { background: var(--surface); }
@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr 1fr; row-gap: var(--s-7); }
  .steps::before { display: none; }
}
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

/* ---------- Instagram / case files panel ---------- */
.feature {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: var(--s-8);
}
.feature__text { display: grid; gap: var(--s-4); justify-items: start; }
.feature__figure { position: relative; }
.feature__figure img { border-radius: var(--r-md); width: 100%; aspect-ratio: 1; object-fit: cover; }
.feature__figure figcaption {
  position: absolute; left: var(--s-4); bottom: var(--s-4);
}
.feature__figure .chip { position: static; }
@media (max-width: 860px) { .feature { grid-template-columns: 1fr; gap: var(--s-6); } }

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--s-8);
  align-items: start;
}
.about__quote { font-size: var(--fs-40); font-weight: var(--fw-light); line-height: 1.15; letter-spacing: -0.015em; }
html[data-lang="zh"] .about__quote { line-height: 1.45; letter-spacing: 0.01em; font-weight: var(--fw-regular); }
.about__body { display: grid; gap: var(--s-6); }
.facts { display: grid; border-top: 1px solid var(--border); }
.facts div {
  display: grid; grid-template-columns: 7rem 1fr; gap: var(--s-4);
  padding: var(--s-3) 0; border-bottom: 1px solid var(--border);
  font-size: var(--fs-14);
}
.facts dt { color: var(--text-faint); }
@media (max-width: 860px) { .about { grid-template-columns: 1fr; gap: var(--s-6); } }

/* ---------- Contact list ---------- */
.contact-head { display: grid; gap: var(--s-4); margin-bottom: var(--s-7); }
.contact-list { border-top: 1px solid var(--text); }
.contact-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--s-4);
  padding: var(--s-5) var(--s-2);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--t-fast) var(--ease-out);
}
.contact-row:hover { background: var(--surface); }
button.contact-row { width: 100%; text-align: left; }
.contact-row__main { display: grid; gap: 2px; }
.contact-row__title { font-size: var(--fs-22); font-weight: var(--fw-regular); }
.contact-row__meta { font-size: var(--fs-14); color: var(--text-faint); }
.contact-row__action { font-size: var(--fs-14); color: var(--accent); font-weight: var(--fw-medium); }

/* ---------- Footer ---------- */
.site-footer { padding-block: var(--s-7); border-top: 1px solid var(--border); }
.site-footer__row {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--s-3) var(--s-6);
  font-size: var(--fs-12); color: var(--text-faint);
}
.site-footer a:hover { color: var(--text); }

/* ---------- Long-form text (privacy page) ---------- */
.prose { display: grid; gap: var(--s-4); max-width: var(--measure); color: var(--text-muted); }
.prose h2 { color: var(--text); font-size: var(--fs-22); font-weight: var(--fw-medium); margin-top: var(--s-5); }
.prose ul { display: grid; gap: var(--s-2); padding-left: var(--s-5); list-style: disc; }
.prose a { color: var(--link); text-decoration: underline; text-underline-offset: 0.2em; }