/*
 * 阶段一：结构骨架。
 * 这里只确认容器、比例、层级和响应式断点，不锁定最终的水墨色板、纹理与动效。
 * 后续视觉层会在此文件上逐段替换，避免一次性改完整站点。
 */
:root {
  color-scheme: light;
  --bg: #efefeb;
  --surface: #f8f8f4;
  --surface-2: #e7e7e1;
  --surface-3: #d7d8d1;
  --surface-4: #c7c9c1;
  --line: #c6c8c0;
  --line-strong: #9da29a;
  --text: #1e2525;
  --text-muted: #626a67;
  --text-dim: #7d8580;
  --accent: #283c3f;
  --accent-strong: #16272b;
  --accent-soft: rgba(40, 60, 63, 0.1);
  --accent-line: rgba(40, 60, 63, 0.36);
  --radius-sm: 0;
  --radius: 0;
  --radius-lg: 0;
  --shadow-1: none;
  --shadow-2: none;
  --rail-w: clamp(224px, 18vw, 288px);
  --maxw: 1480px;
}

body {
  background: var(--bg);
  color: var(--text);
  padding-left: var(--rail-w);
  overflow-x: hidden;
}

.site-rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 60;
  display: block;
  width: var(--rail-w);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.site-rail__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: clamp(34px, 5vh, 58px) clamp(24px, 2.8vw, 44px) 30px;
}

.site-rail__brand {
  display: flex;
  align-items: center;
  gap: 13px;
  min-height: 52px;
  margin-bottom: clamp(46px, 8vh, 88px);
  color: var(--text);
}

.site-rail__brand-mark {
  display: inline-flex;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  color: var(--accent-strong);
  font-size: 1rem;
}

.site-rail__brand-name {
  font-size: 1rem;
  letter-spacing: 0.02em;
  font-weight: 700;
}

.site-rail__nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-rail__link {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  min-height: 52px;
  padding: 14px 14px;
  border-left: 3px solid transparent;
  color: var(--text-muted);
  text-decoration: none;
}

.site-rail__link:hover,
.site-rail__link.is-active {
  background: var(--surface-2);
  border-left-color: var(--accent);
  color: var(--text);
}

.site-rail__index {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.site-rail__link.is-active .site-rail__index {
  color: var(--accent-strong);
}

.site-rail__label {
  font-size: 1rem;
}

.site-rail__foot {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: auto;
  padding: 22px 14px 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
}

.site-header .site-nav {
  display: none;
}

.site-header .site-nav__toggle {
  display: none;
}

/* 桌面端的品牌与导航已经整合进左侧主导航栏。 */
.site-header {
  display: none;
}

.page-grid {
  display: block;
}

.page-grid > .outline {
  display: none;
}

.site-header {
  background: var(--surface);
  border-bottom-color: var(--line);
  box-shadow: none;
}

.brand,
.brand:hover,
.site-nav__link,
.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--text);
}

.brand__logo {
  filter: grayscale(1) contrast(0.72);
}

.site-nav__link {
  border-radius: 0;
}

.site-nav__link.is-active {
  background: var(--surface-2);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.btn,
.chip,
.site-nav__toggle,
.carousel__nav {
  border-radius: 0;
  box-shadow: none;
}

.btn {
  background: var(--surface);
  color: var(--text);
}

.btn:hover,
.btn--primary,
.btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--surface);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
}

.hero {
  min-height: min(100svh, 920px);
  display: grid;
  align-items: stretch;
  background: var(--surface-2);
  border-bottom-color: var(--line);
}

.hero__media,
.hero__media--concept::before,
.hero__media--concept::after {
  display: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  align-items: center;
  gap: clamp(56px, 7vw, 132px);
  padding-top: clamp(72px, 11vh, 132px);
  padding-bottom: clamp(86px, 13vh, 156px);
}

.hero__inner::after {
  display: none;
}

.hero__visual-slot {
  width: 100%;
  min-height: clamp(480px, 66vh, 680px);
  aspect-ratio: 1.12 / 1;
  border: 1px dashed var(--line-strong);
  background:
    linear-gradient(135deg, transparent 49.8%, var(--line-strong) 50%, transparent 50.2%),
    var(--surface);
  content: "";
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
}

.hero__copy {
  max-width: 48ch;
}

.hero__title {
  max-width: 13ch;
  color: var(--text);
  font-size: clamp(3.2rem, 5.8vw, 6.6rem);
  line-height: 1.08;
  text-shadow: none;
}

.hero__lead {
  max-width: 48ch;
  font-size: clamp(1rem, 1.2vw, 1.18rem);
  color: var(--text-muted);
  text-shadow: none;
}

.hero__scroll {
  color: var(--text-dim);
}

.section {
  padding: clamp(104px, 12vh, 168px) 0;
}

.section__head {
  margin-bottom: 34px;
}

.section__title {
  padding-left: 0;
  color: var(--text);
}

.section__title::before {
  display: none;
}

.section__subtitle,
.about__lead {
  color: var(--text-muted);
}

.stats {
  margin-top: 40px;
  border-top-color: var(--line);
  border-bottom-color: var(--line);
}

.stat {
  border-right-color: var(--line);
  background: transparent;
}

.stat__value {
  color: var(--text);
}

.stat__label,
.home-contact__label,
.group-tags__label {
  color: var(--text-dim);
}

.group-banners {
  gap: 28px;
}

.group-banner__open {
  border-color: var(--line-strong);
  background: var(--surface);
  box-shadow: none;
  transform: none;
}

.group-banner__open:hover {
  border-color: var(--accent);
  box-shadow: none;
  transform: none;
}

.group-banner__media .media {
  aspect-ratio: 16 / 6;
  background: var(--surface-3);
}

.group-banner__media .media > img,
.group-banner__hover {
  opacity: 0;
}

.group-banner__body {
  position: static;
  min-height: 148px;
  padding: 22px 26px 24px;
  background: var(--surface);
  color: var(--text);
}

.group-banner__kind {
  border-color: var(--line-strong);
  border-radius: 0;
  color: var(--text-dim);
}

.group-banner__name {
  color: var(--text);
}

.group-banner__summary,
.group-banner__more {
  color: var(--text-muted);
}

.group-banner__more {
  opacity: 1;
  transform: none;
}

.group-tags--banner {
  margin-top: 10px;
}

.card,
.group-block,
.contact-form,
.contact-info__item,
.empty-state,
.error-state {
  border-radius: 0;
  background: var(--surface);
  border-color: var(--line);
  box-shadow: none;
}

.card:hover {
  transform: none;
  box-shadow: none;
}

.card__media,
.media {
  background: var(--surface-3);
}

.masonry .card__media img,
.group-news .card__media img {
  opacity: 0;
}

.page-head,
.news-hero {
  background: var(--surface-2);
  border-bottom-color: var(--line);
}

.page-head__eyebrow,
.page-head__lead,
.news-hero__lead {
  color: var(--text-muted);
}

.group-block__figure {
  background: var(--surface-3);
  border-color: var(--line);
}

.group-block__figure--art {
  background-position: center;
  background-size: cover;
}

.group-block__figure--art .media > img,
.group-block__figure--art .media__placeholder {
  opacity: 0 !important;
}

.group-block__body,
.group-block__works,
.group-tags--block {
  border-top-color: var(--line);
}

.input,
.textarea,
.select {
  border-radius: 0;
  background: var(--surface);
  color: var(--text);
}

.site-footer {
  background: var(--surface-2);
  border-top-color: var(--line);
}

.footer__bottom {
  border-top-color: var(--line);
}

@media (max-width: 820px) {
  body {
    padding-left: 0;
  }

  .site-rail {
    display: none;
  }

  .site-header {
    display: block;
  }

  .site-header .site-nav__toggle {
    display: inline-flex;
  }

  .site-header .site-nav {
    display: none;
  }

  .site-header .site-nav.is-open {
    display: flex;
  }

  .hero {
    min-height: 0;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 72px;
    padding-bottom: 86px;
  }

  .hero__visual-slot {
    min-height: 320px;
    aspect-ratio: 1.15 / 1;
    order: 2;
  }

  .hero__title {
    max-width: 11ch;
    font-size: clamp(2.8rem, 11vw, 4.4rem);
  }
}

@media (max-width: 720px) {
  :root {
    --maxw: 100%;
  }

  .container {
    padding-right: 20px;
    padding-left: 20px;
  }

  .group-banner__media .media {
    aspect-ratio: 4 / 3;
  }

  .group-banner__body {
    min-height: 0;
  }
}