/* S7TT Models — editorial landing（纯静态 / CF Pages） */
:root {
  --bg: #0b0b0c;
  --bg-soft: #111113;
  --fg: #efece6;
  --muted: rgba(239, 236, 230, 0.56);
  --line: rgba(239, 236, 230, 0.14);
  --brass: #b79d76;
  --veil: rgba(11, 11, 12, 0.72);
  --fg-dim: rgba(239, 236, 230, 0.08);
  --font-display: "Songti SC", "Noto Serif SC", "Source Han Serif SC", STSong, SimSun, serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", sans-serif;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --gutter: clamp(20px, 4vw, 56px);
  --max: 1440px;
  --head-h: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

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

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

.eyebrow {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

h1,
h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 0.94;
  letter-spacing: -0.02em;
}

h1 em,
h2 em {
  font-style: italic;
  color: var(--brass);
}

/* ---------- header ---------- */
.site-head {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  height: var(--head-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease);
  border-bottom: 1px solid transparent;
}

.site-head[data-scrolled] {
  background: var(--veil);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: 0.06em;
}

.brand-sub {
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.nav a {
  color: var(--fg);
  opacity: 0.75;
  transition: opacity 0.25s var(--ease);
}

.nav a:hover {
  opacity: 1;
}

.nav-cta {
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  opacity: 1 !important;
}

.nav-cta:hover {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  min-height: min(92vh, 900px);
  min-height: min(92svh, 900px);
  display: flex;
  align-items: flex-end;
  padding: calc(var(--head-h) + 40px) var(--gutter) clamp(32px, 6vh, 72px);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--veil) 0%, rgba(11, 11, 12, 0.25) 34%, var(--bg) 96%);
  pointer-events: none;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 32%;
  filter: saturate(0.86) contrast(1.02);
  transform: scale(1.06);
  animation: hero-drift 1.8s var(--ease) forwards;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
}

.hero-inner .eyebrow {
  color: var(--fg);
  opacity: 0.7;
  margin-bottom: 18px;
  animation: rise 1s var(--ease) both;
}

.hero h1 {
  font-size: clamp(44px, 8.4vw, 118px);
  max-width: 14ch;
  animation: rise 1s 0.12s var(--ease) both;
}

.hero-foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-top: clamp(24px, 4vh, 44px);
  animation: rise 1s 0.24s var(--ease) both;
}

.hero-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: background 0.3s var(--ease), color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
  outline: none;
}

.btn-arrow {
  transition: transform 0.3s var(--ease);
}

.btn:hover .btn-arrow {
  transform: translateX(4px);
}

.btn-lg {
  padding: 18px 30px;
  font-size: 13px;
}

/* ---------- ticker ---------- */
.ticker {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.ticker-track {
  display: inline-flex;
  gap: 40px;
  white-space: nowrap;
  animation: ticker 34s linear infinite;
  will-change: transform;
}

.ticker-track span {
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}

.ticker-track span::after {
  content: "·";
  margin-left: 40px;
  color: var(--brass);
}

/* ---------- models ---------- */
.models {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(56px, 10vh, 120px) var(--gutter) clamp(40px, 8vh, 96px);
}

.section-head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(28px, 5vh, 52px);
}

.section-head .eyebrow {
  grid-column: 1 / -1;
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: clamp(36px, 5.4vw, 68px);
}

.section-note {
  margin: 0;
  text-align: right;
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 4vw, 56px) clamp(14px, 2vw, 28px);
}

.model {
  position: relative;
  display: block;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

section[id] {
  scroll-margin-top: calc(var(--head-h) + 12px);
}

.model-index {
  position: absolute;
  top: 12px;
  left: 14px;
  z-index: 3;
  font-family: var(--font-display);
  font-size: 14px;
  font-style: italic;
  color: var(--fg);
  opacity: 0.82;
  mix-blend-mode: difference;
  pointer-events: none;
}

.model-figure {
  position: relative;
  margin: 0;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: var(--bg-soft);
}

.model-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 11, 12, 0.18) 0%, rgba(11, 11, 12, 0) 30%, rgba(11, 11, 12, 0.55) 100%);
  opacity: 0.75;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}

.model-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 22%;
  filter: saturate(0.88);
  transition: transform 0.7s var(--ease), filter 0.7s var(--ease);
}

.model-view {
  position: absolute;
  right: 14px;
  bottom: 12px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.model:hover .model-figure img,
.model:focus-visible .model-figure img {
  transform: scale(1.045);
  filter: saturate(1);
}

.model:hover .model-figure::after,
.model:focus-visible .model-figure::after {
  opacity: 1;
}

.model:hover .model-view,
.model:focus-visible .model-view {
  opacity: 1;
  transform: translateY(0);
}

.model:focus-visible {
  outline: 1px solid var(--fg);
  outline-offset: 6px;
}

.model-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid transparent;
  transition: border-color 0.3s var(--ease);
}

.model:hover .model-meta {
  border-top-color: var(--line);
}

.model-name {
  font-family: var(--font-display);
  font-size: clamp(18px, 1.6vw, 24px);
  letter-spacing: 0.01em;
}

.model-info {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- about ---------- */
.about {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(28px, 6vw, 96px);
  align-items: start;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 9vh, 110px) var(--gutter);
  border-top: 1px solid var(--line);
}

.about-head .eyebrow {
  margin-bottom: 14px;
}

.about-head h2 {
  font-size: clamp(34px, 4.6vw, 60px);
}

.about-body p {
  margin: 0 0 16px;
  max-width: 46ch;
  color: var(--muted);
  font-size: 15px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: clamp(24px, 4vh, 40px) 0 0;
}

.stats div {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.stats dt {
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.stats dd {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: clamp(24px, 2.4vw, 34px);
}

/* ---------- CTA ---------- */
.cta {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(64px, 12vh, 150px) var(--gutter) clamp(72px, 13vh, 170px);
  border-top: 1px solid var(--line);
  text-align: center;
}

.cta .eyebrow {
  margin-bottom: 18px;
}

.cta h2 {
  font-size: clamp(40px, 6.6vw, 96px);
  margin-bottom: clamp(28px, 5vh, 48px);
}

/* ---------- footer ---------- */
.site-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px var(--gutter) 28px;
  border-top: 1px solid var(--line);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-foot a:hover {
  color: var(--fg);
}

.foot-note {
  color: var(--brass);
}

/* ---------- motion ---------- */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-drift {
  from {
    transform: scale(1.1);
  }
  to {
    transform: scale(1);
  }
}

@keyframes ticker {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- responsive ---------- */
/* 触屏设备：禁用会“粘住”的悬停态，保证点按即跳转 */
@media (hover: none) {
  .model:hover .model-figure img {
    transform: none;
    filter: saturate(0.88);
  }
  .model:hover .model-figure::after {
    opacity: 0.75;
  }
  .model:hover .model-view {
    opacity: 0;
    transform: translateY(8px);
  }
}

@media (max-width: 1024px) {
  .about {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 780px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px 12px;
  }
  .section-head {
    grid-template-columns: 1fr;
  }
  .section-note {
    text-align: left;
  }
  .hero-foot {
    align-items: flex-start;
    flex-direction: column;
  }
  .about-body p {
    max-width: none;
  }
}

@media (max-width: 560px) {
  :root {
    --head-h: 60px;
    --gutter: 16px;
  }
  .nav {
    gap: 14px;
  }
  .nav a:not(.nav-cta) {
    display: none;
  }
  .brand-mark {
    font-size: 21px;
  }
  .brand-sub {
    font-size: 9px;
    letter-spacing: 0.26em;
  }
  .nav-cta {
    padding: 9px 14px;
  }
  .hero {
    min-height: 74vh;
    min-height: 74svh;
    padding-bottom: 28px;
  }
  .hero h1 {
    font-size: clamp(38px, 13vw, 56px);
  }
  .hero-note {
    display: none;
  }
  .model-view {
    display: none;
  }
  .model-name {
    font-size: 17px;
  }
  .model-info {
    font-size: 9px;
    letter-spacing: 0.14em;
  }
  .stats {
    gap: 10px;
  }
  .site-foot {
    justify-content: flex-start;
    gap: 8px;
    padding-bottom: calc(22px + env(safe-area-inset-bottom));
  }
  .cta {
    padding-bottom: calc(72px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 400px) {
  .model-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }
  .grid {
    gap: 20px 10px;
  }
  .ticker-track span {
    font-size: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .hero-media img,
  .hero-inner .eyebrow,
  .hero h1,
  .hero-foot,
  .ticker-track {
    animation: none;
  }
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .model-figure img,
  .model-figure::after,
  .model-view {
    transition: none;
  }
}