/* =========================================================
   TSUKASA WHITE MODEL — 高端极简样式
   ========================================================= */
:root {
  --bg:          #F6F3EE;
  --bg-alt:      #EFEAE2;
  --bg-deep:     #E7E1D7;
  --ink:         #1C1B19;
  --ink-soft:    #6B665F;
  --ink-faint:   #A29C93;
  --line:        rgba(28, 27, 25, 0.12);
  --line-strong: rgba(28, 27, 25, 0.22);
  --serif:  'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --sans:   'Inter', 'Helvetica Neue', Arial, sans-serif;
  --cn:     'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --ease: cubic-bezier(0.22, 0.61, 0.18, 1);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-weight: 300; line-height: 1.6;
  letter-spacing: 0.01em; overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.eyebrow {
  font-family: var(--sans); font-weight: 300; font-size: 0.7rem;
  letter-spacing: 0.32em; text-transform: uppercase;
  color: var(--ink-soft); margin: 0 0 2.2rem;
}
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.6rem clamp(1.5rem, 4vw, 3.5rem); pointer-events: none;
}
.nav__brand, .nav__meta {
  font-family: var(--sans); font-weight: 300; font-size: 0.72rem;
  letter-spacing: 0.34em; text-transform: uppercase; color: var(--ink);
}
.nav__meta { color: var(--ink-soft); }

.screen {
  position: relative; min-height: 100vh; width: 100%;
  padding: clamp(6rem, 10vh, 9rem) clamp(1.5rem, 6vw, 6rem) clamp(4rem, 8vh, 7rem);
}
.screen--hero { display: flex; align-items: center; }
.hero__inner {
  width: 100%; max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem); align-items: center;
}
.hero__text { padding-right: 1rem; }
.hero__title {
  font-family: var(--serif); font-weight: 400; line-height: 0.98;
  letter-spacing: -0.01em; margin: 0 0 2rem;
}
.hero__title-main {
  display: block; font-size: clamp(3.4rem, 9vw, 7.5rem);
  font-style: italic; font-weight: 500;
}
.hero__title-sub {
  display: block; font-size: clamp(1.6rem, 4vw, 3rem);
  font-weight: 300; letter-spacing: 0.06em;
  color: var(--ink-soft); margin-top: 0.4rem;
}
.hero__subtitle {
  font-family: var(--sans); font-weight: 300;
  font-size: clamp(0.78rem, 1.4vw, 0.92rem);
  letter-spacing: 0.18em; color: var(--ink-soft);
  text-transform: uppercase; margin: 0 0 3rem; max-width: 30ch;
}
.hero__cta {
  display: inline-flex; align-items: center; gap: 1rem;
  font-family: var(--sans); font-size: 0.72rem;
  letter-spacing: 0.34em; text-transform: uppercase;
  color: var(--ink); padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line-strong);
  transition: gap 0.6s var(--ease), color 0.6s var(--ease);
}
.hero__cta:hover { gap: 1.6rem; color: var(--ink-soft); }
.hero__cta-line {
  width: 2.4rem; height: 1px; background: currentColor; display: inline-block;
}
.hero__visual { position: relative; }
.hero__img {
  width: 100%; max-height: 80vh; height: auto;
  object-fit: contain; object-position: center top;
  filter: contrast(0.98) saturate(0.96);
}
.hero__caption {
  font-family: var(--sans); font-weight: 300; font-size: 0.68rem;
  letter-spacing: 0.26em; text-transform: uppercase;
  color: var(--ink-faint); margin: 1rem 0 0; text-align: right;
}
.hero__edge {
  position: absolute; bottom: 2rem;
  font-family: var(--sans); font-size: 0.66rem;
  letter-spacing: 0.3em; color: var(--ink-faint); text-transform: uppercase;
}
.hero__edge--l { left: clamp(1.5rem, 6vw, 6rem); }
.hero__edge--r { right: clamp(1.5rem, 6vw, 6rem); }

.screen--info {
  background: var(--bg-alt); display: flex; align-items: center; justify-content: center;
}
.info__inner { width: 100%; max-width: 720px; margin: 0 auto; text-align: center; }
.info__inner .eyebrow { text-align: center; }
.info__card {
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 2.4rem 0; margin: 0 auto;
}
.info__row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 1.5rem 0; border-bottom: 1px solid var(--line);
}
.info__row:last-child { border-bottom: none; }
.info__label {
  font-family: var(--sans); font-weight: 300; font-size: 0.7rem;
  letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-faint);
}
.info__value {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  letter-spacing: 0.04em; color: var(--ink);
}
.info__value--cn { font-family: var(--cn); font-weight: 300; letter-spacing: 0.15em; }

.screen--viewer {
  background: var(--bg-deep); padding: 0;
  display: flex; flex-direction: column;
}
.viewer__head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 2.2rem clamp(1.5rem, 6vw, 6rem) 0;
}
.eyebrow--invert { color: var(--ink-soft); margin-bottom: 0; }
.viewer__reset {
  display: inline-flex; align-items: center; gap: 0.6rem;
  background: transparent; border: 1px solid var(--line-strong); color: var(--ink);
  font-family: var(--sans); font-weight: 300; font-size: 0.66rem;
  letter-spacing: 0.3em; text-transform: uppercase;
  padding: 0.6rem 1.1rem; border-radius: 999px;
  transition: background 0.5s var(--ease), color 0.5s var(--ease);
}
.viewer__reset:hover { background: var(--ink); color: var(--bg); }
.viewer__stage {
  position: relative; flex: 1; min-height: 64vh;
  margin: 1.6rem clamp(1.5rem, 6vw, 6rem) 0;
}
#viewer-canvas { width: 100%; height: 100%; display: block; touch-action: none; }
.viewer__status {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--sans); font-weight: 300; font-size: 0.72rem;
  letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-soft);
}
.viewer__status--error { color: #8a4b3b; }
.viewer__hint {
  font-family: var(--sans); font-weight: 300; font-size: 0.64rem;
  letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--ink-faint); text-align: center;
  padding: 1.6rem 1rem 2.6rem; margin: 0;
}
.footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 2rem clamp(1.5rem, 6vw, 6rem);
  border-top: 1px solid var(--line);
  font-family: var(--sans); font-weight: 300; font-size: 0.66rem;
  letter-spacing: 0.26em; text-transform: uppercase; color: var(--ink-faint);
}
[data-reveal] {
  opacity: 0; transform: translateY(30px);
  transition: opacity 1.3s var(--ease), transform 1.3s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-visible { opacity: 1; transform: none; }
[data-reveal-delay="1"] { transition-delay: 0.18s; }
[data-reveal-delay="2"] { transition-delay: 0.36s; }
[data-reveal-delay="3"] { transition-delay: 0.54s; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}
@media (max-width: 880px) {
  .hero__inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero__text { padding-right: 0; order: 2; }
  .hero__visual { order: 1; }
  .hero__img { height: 52vh; }
  .hero__caption { text-align: left; }
  .info__row { flex-direction: column; align-items: flex-start; gap: 0.4rem; padding: 1.2rem 0; }
  .nav__meta { display: none; }
  .footer { flex-direction: column; gap: 0.6rem; text-align: center; }
}