/* ============================================================
   半岛BOB入口 — /assets/site.css
   展览画册式全站共享样式
   ============================================================ */

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background: var(--color-cream);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

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

ul,
ol {
  list-style: none;
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: var(--color-navy);
  color: var(--color-cream);
}

:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- Variables ---------- */
:root {
  --color-cream: #F5F0E8;
  --color-ink: #1E1B17;
  --color-navy: #10233F;
  --color-gold: #C39A53;
  --color-gold-text: #8A6A2F;
  --color-orange: #D9512E;
  --color-orange-dark: #B23A1E;
  --color-slate: #3D4A5C;
  --color-muted: #8A8178;
  --color-white: #FFFFFF;
  --color-line: #D8CFC2;
  --color-emerald: #2B6B50;

  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;

  --text-hero: clamp(2.4rem, 5vw, 4.6rem);
  --text-h1: clamp(2rem, 3.6vw, 3.2rem);
  --text-h2: clamp(1.5rem, 2.8vw, 2.1rem);
  --text-h3: clamp(1.125rem, 1.6vw, 1.375rem);
  --text-body: 1rem;
  --text-sm: 0.875rem;
  --text-xs: 0.8125rem;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 48px;
  --space-5: 96px;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --ease-fast: 200ms ease;
  --ease-slow: 400ms ease;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 64px);
}

.section {
  padding-block: clamp(48px, 8vw, 96px);
}

.section--tight {
  padding-block: clamp(24px, 4vw, 48px);
}

.section--navy {
  background: var(--color-navy);
  color: rgba(245, 240, 232, 0.85);
}

.section--navy .eyebrow {
  color: var(--color-gold);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.grid--2,
.grid--6-6 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid--4-8 {
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
}

.grid--8-4 {
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
}

@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--4-8,
  .grid--8-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--6-6 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Typography helpers ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gold-text);
}

.h-display {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: var(--text-hero);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-head {
  padding-top: clamp(32px, 6vw, 72px);
  padding-bottom: clamp(24px, 4vw, 48px);
}

.page-head__eyebrow {
  margin-bottom: 12px;
}

.page-head__title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: var(--text-h1);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  max-width: 18ch;
}

.page-head__desc {
  margin-top: 14px;
  max-width: 52ch;
  color: var(--color-slate);
  font-size: var(--text-sm);
}

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: var(--text-xs);
  color: var(--color-slate);
}

.meta-line__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.meta-line__item::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-gold);
  flex-shrink: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.2;
  white-space: nowrap;
  transition:
    background-color var(--ease-fast),
    border-color var(--ease-fast),
    color var(--ease-fast),
    box-shadow var(--ease-fast),
    transform var(--ease-fast);
}

.btn--primary {
  background: var(--color-orange-dark);
  border-color: var(--color-orange-dark);
  color: var(--color-white);
  box-shadow: 0 2px 0 rgba(30, 27, 23, 0.15);
}

.btn--primary:hover {
  background: var(--color-orange);
  border-color: var(--color-orange);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(217, 81, 46, 0.28);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(245, 240, 232, 0.5);
  color: var(--color-cream);
}

.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn--outline:hover {
  background: var(--color-ink);
  color: var(--color-cream);
  transform: translateY(-2px);
}

/* ---------- Cards & tags ---------- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition:
    transform var(--ease-fast),
    border-color var(--ease-fast),
    box-shadow var(--ease-fast);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--color-gold);
  box-shadow: 0 8px 24px rgba(195, 154, 83, 0.18);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-line);
  background: var(--color-cream);
  color: var(--color-slate);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.tag--gold {
  border-color: var(--color-gold);
  background: rgba(195, 154, 83, 0.12);
  color: var(--color-navy);
}

.tag--orange {
  border-color: var(--color-orange);
  background: rgba(217, 81, 46, 0.08);
  color: var(--color-orange-dark);
}

.tag--navy {
  border-color: var(--color-navy);
  background: var(--color-navy);
  color: var(--color-cream);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  padding-block: 16px;
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.breadcrumbs a {
  color: var(--color-slate);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--ease-fast);
}

.breadcrumbs a:hover {
  color: var(--color-orange-dark);
}

.breadcrumbs__sep {
  color: var(--color-line);
  display: inline-block;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 600;
}

/* ---------- Image frames ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-line);
  border-radius: var(--radius-md);
  aspect-ratio: 4 / 3;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame--wide {
  aspect-ratio: 16 / 9;
}

.img-frame--portrait {
  aspect-ratio: 3 / 4;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 18px;
  background: var(--color-navy);
  color: var(--color-cream);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(16, 35, 63, 0.35);
  transform: translateY(-160%);
  transition: transform var(--ease-fast);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: clamp(10px, 2vw, 24px);
  z-index: 200;
  padding-inline: clamp(10px, 2.5vw, 24px);
  transition: top var(--ease-fast);
}

.site-header[data-scrolled] {
  top: 8px;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  padding-block: 10px;
  background: rgba(255, 255, 255, 0.82);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid rgba(216, 207, 194, 0.9);
  border-radius: var(--radius-pill);
  box-shadow: 0 2px 20px rgba(30, 27, 23, 0.06);
  transition:
    padding-block var(--ease-fast),
    box-shadow var(--ease-fast),
    background var(--ease-fast);
}

.site-header[data-scrolled] .site-header__inner {
  padding-block: 6px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 6px 28px rgba(16, 35, 63, 0.14);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-brand__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-navy);
  white-space: nowrap;
}

.site-brand__zh {
  color: var(--color-ink);
}

.site-brand__en {
  font-family: var(--font-mono);
  color: var(--color-gold-text);
}

.site-brand__sub {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-slate);
  border-left: 1px solid var(--color-line);
  padding-left: 10px;
  line-height: 1.2;
}

.site-nav {
  margin-inline: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  display: block;
}

.site-nav__link {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-slate);
  white-space: nowrap;
  transition:
    background-color var(--ease-fast),
    color var(--ease-fast);
}

.site-nav__link:hover {
  background: var(--color-cream);
  color: var(--color-ink);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-navy);
  color: var(--color-gold);
  font-weight: 600;
}

.site-nav__cta {
  display: none;
}

.site-header__cta {
  flex-shrink: 0;
  padding: 9px 18px;
  font-size: 0.875rem;
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
  padding: 8px 14px 8px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-line);
  background: var(--color-cream);
  transition:
    border-color var(--ease-fast),
    background var(--ease-fast);
}

.nav-toggle:hover {
  border-color: var(--color-gold);
}

.nav-toggle__icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 20px;
  height: 16px;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-navy);
  transition: transform var(--ease-fast), opacity var(--ease-fast);
}

.nav-toggle__label {
  font-size: 0.8125rem;
  font-weight: 600;
  line-height: 1;
  color: var(--color-navy);
}

.nav-toggle--open .nav-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translateY(4px);
}

.nav-toggle--open .nav-toggle__bar:nth-child(2) {
  transform: rotate(-45deg) translateY(-4px);
}

/* ---------- Reading progress ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 300;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-orange) 100%);
  transform: scaleX(var(--scroll-p, 0));
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--color-navy);
  color: rgba(245, 240, 232, 0.85);
  margin-top: clamp(48px, 8vw, 96px);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold) 0%, rgba(195, 154, 83, 0.1) 40%, var(--color-orange) 100%);
  pointer-events: none;
}

.site-footer__top {
  position: relative;
  padding-block: clamp(40px, 6vw, 72px) clamp(24px, 4vw, 40px);
}

.site-footer__top::before,
.site-footer__top::after {
  content: "";
  position: absolute;
  width: 32px;
  height: 32px;
  pointer-events: none;
  opacity: 0.7;
}

.site-footer__top::before {
  top: 16px;
  left: 16px;
  border-top: 1px solid rgba(195, 154, 83, 0.5);
  border-left: 1px solid rgba(195, 154, 83, 0.5);
}

.site-footer__top::after {
  bottom: 16px;
  right: 16px;
  border-bottom: 1px solid rgba(195, 154, 83, 0.5);
  border-right: 1px solid rgba(195, 154, 83, 0.5);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.2fr);
  gap: clamp(24px, 4vw, 48px);
}

.site-footer__brand {
  max-width: 40ch;
}

.site-footer__logo {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 1.75rem;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--color-cream);
}

.site-footer__logo-en {
  font-family: var(--font-mono);
  color: var(--color-gold);
}

.site-footer__logo-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(195, 154, 83, 0.8);
  margin-top: 4px;
}

.site-footer__about {
  margin-top: 16px;
  font-size: 0.875rem;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.72);
}

.site-footer__trust {
  margin-top: 20px;
  padding-left: 14px;
  border-left: 2px solid rgba(195, 154, 83, 0.5);
  font-size: 0.75rem;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.55);
}

.site-footer__heading {
  position: relative;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-gold);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(195, 154, 83, 0.35);
}

.site-footer__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 28px;
  height: 2px;
  background: var(--color-gold);
}

.site-footer__list {
  display: grid;
  gap: 10px;
}

.site-footer__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(245, 240, 232, 0.75);
  font-size: 0.9375rem;
  transition: color var(--ease-fast);
}

.site-footer__list a::before {
  content: "→";
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gold);
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity var(--ease-fast),
    transform var(--ease-fast);
}

.site-footer__list a:hover {
  color: var(--color-gold);
}

.site-footer__list a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.site-footer__col--contact {
  background: rgba(245, 240, 232, 0.04);
  border: 1px solid rgba(195, 154, 83, 0.25);
  border-radius: var(--radius-md);
  padding: 20px;
}

.site-footer__contact-list {
  display: grid;
  gap: 12px;
}

.site-footer__contact-item {
  display: grid;
  gap: 2px;
}

.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
  opacity: 0.85;
}

.site-footer__contact-value {
  color: rgba(245, 240, 232, 0.88);
  font-size: 0.875rem;
  line-height: 1.5;
}

.site-footer__contact-value a {
  transition: color var(--ease-fast);
}

.site-footer__contact-value a:hover {
  color: var(--color-gold);
}

.site-footer__bottom {
  border-top: 1px solid rgba(245, 240, 232, 0.12);
  padding-block: 18px;
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  font-size: 0.8125rem;
  color: rgba(245, 240, 232, 0.65);
}

.site-footer__icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: rgba(245, 240, 232, 0.55);
}

.site-footer__icp a {
  color: rgba(245, 240, 232, 0.72);
  transition: color var(--ease-fast);
}

.site-footer__icp a:hover {
  color: var(--color-gold);
}

.site-footer__sep {
  color: rgba(245, 240, 232, 0.3);
  margin-inline: 6px;
}

/* ---------- Top button ---------- */
.top-button {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 90;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-line);
  color: var(--color-navy);
  box-shadow: 0 4px 16px rgba(30, 27, 23, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--ease-fast),
    transform var(--ease-fast),
    visibility var(--ease-fast),
    background var(--ease-fast),
    color var(--ease-fast),
    border-color var(--ease-fast);
}

.top-button.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.top-button:hover {
  background: var(--color-navy);
  color: var(--color-gold);
  border-color: var(--color-navy);
}

.top-button__icon {
  font-size: 1.25rem;
  line-height: 1;
}

/* ---------- Reveal on scroll ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--ease-slow),
    transform var(--ease-slow);
  transition-delay: var(--reveal-delay, 0ms);
}

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

@media (prefers-reduced-motion: reduce) {
  .js-enabled [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .site-header__inner {
    border-radius: var(--radius-lg);
    padding-block: 10px;
  }

  .site-header__cta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    margin-inline: 0;
    background: rgba(255, 255, 255, 0.96);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid var(--color-line);
    border-radius: 20px;
    box-shadow: 0 16px 40px rgba(30, 27, 23, 0.14);
    padding: 16px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    pointer-events: none;
    transition:
      opacity 0.25s ease,
      transform 0.25s ease,
      visibility 0.25s;
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .site-nav__link {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 1rem;
  }

  .site-nav__link:hover {
    background: var(--color-cream);
  }

  .site-nav__link[aria-current="page"] {
    background: var(--color-cream);
    color: var(--color-navy);
    border-left: 3px solid var(--color-gold);
    padding-left: 13px;
  }

  .site-nav__cta {
    display: flex;
    width: 100%;
    justify-content: center;
    margin-top: 12px;
  }

  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 380px) {
  .nav-toggle__label {
    display: none;
  }

  .site-brand__sub {
    display: none;
  }
}