/* ==========================================================
   bb娱乐平台登录艾弗森官方主页 — 全站共享样式 /assets/site.css
   深海档案馆 · 深海蓝 × 金色 × 珊瑚橙 × 珍珠白
   ========================================================== */

/* 1. 变量与基调 */
:root {
  color-scheme: dark;
  --c-deep: #0B2036;
  --c-mid: #123B5C;
  --c-gold: #D4AF37;
  --c-coral: #FF7F50;
  --c-pearl: #F8F7F4;
  --c-ink: #1A2A3A;
  --c-sand: #E8DCC8;
  --c-cyan: #7FB3D5;
  --c-dark: #0A1420;
  --c-error: #C0392B;

  --grad-sea: linear-gradient(135deg, var(--c-deep) 0%, var(--c-mid) 100%);
  --grad-gold: linear-gradient(135deg, var(--c-gold) 0%, #F4DE9A 50%, var(--c-coral) 100%);

  --font-display: "Space Grotesk", "Avenir Next", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Source Serif", Georgia, "Songti SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;

  --fs-kicker: 0.75rem;
  --fs-body: clamp(1rem, 1vw, 1.125rem);
  --fs-lead: clamp(1.125rem, 1.4vw, 1.375rem);
  --fs-hero: clamp(2.75rem, 7vw, 6rem);
  --fs-h2: clamp(2rem, 4vw, 3.5rem);
  --fs-h3: clamp(1.3rem, 2vw, 1.75rem);
  --fs-h4: clamp(1.1rem, 1.4vw, 1.35rem);
  --fs-small: 0.8125rem;
  --fs-micro: 0.6875rem;

  --space-section: clamp(4rem, 9vw, 7.5rem);
  --space-block: clamp(2rem, 4vw, 3.5rem);
  --radius-sm: 6px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --header-h: 76px;
  --content-max: 1200px;
  --content-wide: 1440px;
  --content-narrow: 880px;
  --content-reading: 720px;
  --shadow-1: 0 1px 2px rgba(10, 20, 32, 0.18);
  --shadow-2: 0 8px 24px rgba(10, 20, 32, 0.3);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --glass-bg: rgba(11, 32, 54, 0.72);
  --glass-border: rgba(212, 175, 55, 0.22);
}

/* 2. Reset 与基础 */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  color: var(--c-pearl);
  background-color: var(--c-deep);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(127, 179, 213, 0.14) 0%, transparent 32rem),
    radial-gradient(circle at 88% 8%, rgba(212, 175, 55, 0.08) 0%, transparent 28rem),
    linear-gradient(180deg, #0B2036 0%, #0A1829 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
  appearance: none;
}

h1,
h2,
h3,
h4,
.brand-name,
.nav-link,
.btn,
.kicker,
.tag,
.stat__label,
.breadcrumb,
.footer__heading,
.accordion__summary,
.display-title,
.section-title {
  font-family: var(--font-display);
}

h1,
h2,
h3,
h4 {
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: inherit;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

a {
  color: var(--c-gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color 0.25s var(--ease);
}

a:hover {
  color: var(--c-coral);
}

::selection {
  background: rgba(255, 127, 80, 0.75);
  color: var(--c-deep);
}

:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 3px;
  border-radius: 2px;
}

a:focus-visible,
.nav-toggle:focus-visible,
summary:focus-visible {
  outline-color: var(--c-gold);
}

/* 3. 正文主区域 */
#main-content {
  display: block;
  padding-top: var(--header-h);
}

.content {
  padding-block: var(--space-section);
}

/* 4. 容器 */
.container,
.container--wide,
.container--narrow,
.container--reading {
  width: 100%;
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

.container {
  max-width: var(--content-max);
}

.container--wide {
  max-width: var(--content-wide);
}

.container--narrow {
  max-width: var(--content-narrow);
}

.container--reading {
  max-width: var(--content-reading);
}

/* 5. 楼层面板 */
.panel {
  padding-block: var(--space-section);
}

.panel--dark {
  background: var(--c-deep);
  color: var(--c-pearl);
}

.panel--mid {
  background: linear-gradient(160deg, var(--c-deep) 0%, var(--c-mid) 100%);
  color: var(--c-pearl);
}

.panel--paper {
  background: var(--c-pearl);
  color: var(--c-ink);
}

.panel--sand {
  background: var(--c-sand);
  color: var(--c-ink);
}

.panel--ink {
  background: var(--c-dark);
  color: var(--c-pearl);
}

/* 6. 跳转链接与进度条 */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1003;
  padding: 0.6rem 1.1rem;
  background: var(--c-gold);
  color: var(--c-deep);
  font-family: var(--font-display);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 999px;
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.3s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--c-deep);
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 999;
  width: 100%;
  height: 3px;
  background: rgba(127, 179, 213, 0.12);
  pointer-events: none;
}

.progress-bar__fill {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--grad-gold);
  transform-origin: left center;
}

/* 7. 页头 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--glass-border);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(212, 175, 55, 0.5) 25%, rgba(255, 127, 80, 0.4) 75%, transparent 100%);
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 100%;
  padding: 0 clamp(1rem, 3vw, 2rem);
  max-width: var(--content-wide);
  margin-inline: auto;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--c-pearl);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--c-pearl);
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 2.25rem;
  height: 2.25rem;
  display: grid;
  place-items: center;
  transform: rotate(45deg);
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.3), rgba(255, 127, 80, 0.25));
  border: 1px solid rgba(212, 175, 55, 0.8);
}

.brand-mark__core {
  display: block;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  background: var(--c-coral);
  border: 1px solid rgba(248, 247, 244, 0.8);
}

.brand-word {
  display: grid;
  line-height: 1.15;
}

.brand-name {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--c-pearl);
  white-space: nowrap;
}

.brand-sub {
  display: block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.site-nav {
  position: static;
  visibility: visible;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.6rem);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.35rem 0.1rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: rgba(248, 247, 244, 0.82);
  text-decoration: none;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-gold);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.3s var(--ease);
}

.nav-link:hover {
  color: var(--c-pearl);
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.nav-link[aria-current="page"] {
  color: var(--c-gold);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: 1002;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  background: rgba(18, 59, 92, 0.5);
  color: var(--c-pearl);
  font-family: var(--font-display);
  font-size: var(--fs-small);
  cursor: pointer;
}

.nav-toggle__bar {
  position: relative;
  display: block;
  width: 1.1rem;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease);
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s var(--ease);
}

.nav-toggle__bar::before {
  top: -6px;
}

.nav-toggle__bar::after {
  top: 6px;
}

.nav-toggle__label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: inherit;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after {
  transform: translateY(-6px) rotate(-45deg);
}

body.nav-open {
  overflow: hidden;
}

/* 8. 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.2s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: none;
}

.btn--primary {
  background: var(--c-coral);
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(255, 127, 80, 0.25);
}

.btn--primary:hover {
  background: #ff9770;
  color: #ffffff;
}

.btn--ghost {
  background: transparent;
  color: var(--c-pearl);
  border-color: rgba(212, 175, 55, 0.7);
}

.btn--ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.btn--dark {
  background: var(--c-deep);
  color: var(--c-pearl);
  border-color: var(--c-deep);
}

.btn--dark:hover {
  background: var(--c-mid);
  color: var(--c-pearl);
}

.btn--small {
  padding: 0.45rem 1rem;
  font-size: 0.8125rem;
}

/* 9. 标题与正文 */
.kicker {
  display: inline-block;
  font-size: var(--fs-kicker);
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 1rem;
}

.kicker--coral {
  color: var(--c-coral);
}

.kicker--cyan {
  color: var(--c-cyan);
}

.display-title {
  font-size: var(--fs-hero);
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-title--thin {
  font-weight: 300;
}

.section-lead {
  font-size: var(--fs-lead);
  line-height: 1.6;
  max-width: 46em;
  margin-bottom: 2rem;
}

.prose p {
  margin-bottom: 1.25em;
  max-width: 70ch;
}

.prose strong {
  color: var(--c-coral);
  font-weight: 600;
}

.page-head {
  padding-block: clamp(3rem, 6vw, 5rem) 1.5rem;
}

.page-head__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  margin-bottom: 1rem;
}

.rule {
  display: block;
  height: 1px;
  border: 0;
  margin: var(--space-block) 0;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
}

.rule--sand {
  background: linear-gradient(90deg, transparent, var(--c-sand), transparent);
}

/* 10. 首屏 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
  min-height: calc(100vh - var(--header-h));
  padding-block: var(--space-section);
}

.hero__copy {
  max-width: 40rem;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.9rem;
  margin-bottom: 1.75rem;
}

.hero__index {
  display: grid;
  gap: 0.6rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--c-gold);
  font-family: var(--font-display);
  font-size: var(--fs-small);
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--c-cyan);
  margin-top: 2rem;
}

.hero__visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 320px;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 5;
  max-width: 28rem;
  margin-inline: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  background:
    radial-gradient(circle at 68% 22%, rgba(212, 175, 55, 0.3) 0%, transparent 42%),
    radial-gradient(circle at 24% 82%, rgba(255, 127, 80, 0.24) 0%, transparent 38%),
    linear-gradient(155deg, var(--c-mid) 0%, var(--c-deep) 72%);
  overflow: hidden;
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(127, 179, 213, 0.3);
  border-radius: 50%;
}

.hero-visual::before {
  width: 84%;
  aspect-ratio: 1;
}

.hero-visual::after {
  width: 56%;
  aspect-ratio: 1;
  border-color: rgba(212, 175, 55, 0.45);
}

.hero-visual__orb {
  position: relative;
  z-index: 1;
  width: 38%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(140deg, rgba(255, 127, 80, 0.9) 0%, rgba(212, 175, 55, 0.75) 55%, rgba(127, 179, 213, 0.6) 100%);
  box-shadow: 0 0 3rem rgba(255, 127, 80, 0.35);
}

/* 11. 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.8rem;
  margin-bottom: 2rem;
  font-size: var(--fs-small);
  letter-spacing: 0.04em;
  color: rgba(248, 247, 244, 0.55);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
}

.breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: rgba(248, 247, 244, 0.3);
  font-size: 0.75rem;
}

.breadcrumb__link {
  color: var(--c-gold);
  text-decoration: none;
}

.breadcrumb__link:hover {
  color: var(--c-coral);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--c-sand);
}

/* 12. 栅格与卡片 */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

.grid--asym {
  grid-template-columns: 2fr 1fr;
}

.card {
  background: rgba(248, 247, 244, 0.06);
  border: 1px solid rgba(212, 175, 55, 0.18);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.card:hover {
  background: rgba(248, 247, 244, 0.1);
  border-color: rgba(212, 175, 55, 0.4);
  transform: translateY(-4px);
}

.card--paper {
  background: var(--c-pearl);
  color: var(--c-ink);
  border: 1px solid rgba(26, 42, 58, 0.1);
  box-shadow: var(--shadow-1);
}

.card--paper:hover {
  background: #ffffff;
  box-shadow: var(--shadow-2);
}

.card__title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--c-gold);
  margin-bottom: 0.75rem;
}

.card__meta--coral {
  color: var(--c-coral);
}

.card__body p {
  font-size: 0.95em;
  opacity: 0.86;
  margin-bottom: 1em;
}

.card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-coral);
  text-decoration: none;
}

.card__link:hover {
  color: var(--c-gold);
}

/* 13. 标签、统计、时间轴 */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(212, 175, 55, 0.45);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.08);
}

.tag--activity {
  border-color: rgba(255, 127, 80, 0.55);
  color: var(--c-coral);
  background: rgba(255, 127, 80, 0.08);
}

.tag--cyan {
  border-color: rgba(127, 179, 213, 0.5);
  color: var(--c-cyan);
  background: rgba(127, 179, 213, 0.08);
}

.stat {
  display: grid;
  gap: 0.4rem;
}

.stat__value {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 300;
  line-height: 1;
  color: var(--c-gold);
}

.stat__value--coral {
  color: var(--c-coral);
}

.stat__label {
  font-size: var(--fs-small);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(248, 247, 244, 0.7);
}

.timeline {
  position: relative;
  padding-left: 2.25rem;
  border-left: 1px solid rgba(212, 175, 55, 0.3);
}

.timeline__item {
  position: relative;
  padding-bottom: 2.25rem;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -2.25rem;
  top: 0.3rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-coral);
  border: 2px solid var(--c-deep);
  box-shadow: 0 0 0 2px rgba(255, 127, 80, 0.35);
}

.timeline__item:nth-child(even)::before {
  background: var(--c-gold);
  box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.3);
}

.timeline__date {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--c-gold);
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.timeline__body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.timeline__body p {
  font-size: 0.95em;
  opacity: 0.86;
  max-width: 60ch;
}

/* 14. 手风琴 */
.accordion {
  display: grid;
  gap: 0.875rem;
}

.accordion__item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: rgba(248, 247, 244, 0.04);
  overflow: hidden;
}

.accordion__item[open] {
  border-color: rgba(212, 175, 55, 0.5);
  background: rgba(248, 247, 244, 0.06);
}

.accordion__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.accordion__summary::-webkit-details-marker {
  display: none;
}

.accordion__summary::after {
  content: "+";
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  font-size: 1.1rem;
  color: var(--c-gold);
  transition: transform 0.3s var(--ease);
}

.accordion__item[open] .accordion__summary::after {
  transform: rotate(45deg);
}

.accordion__content {
  padding: 0 1.5rem 1.25rem;
  color: rgba(248, 247, 244, 0.8);
}

.accordion__content p {
  max-width: 65ch;
}

/* 15. 图片占位容器 */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background:
    radial-gradient(circle at 22% 18%, rgba(212, 175, 55, 0.32) 0%, transparent 42%),
    radial-gradient(circle at 78% 78%, rgba(255, 127, 80, 0.3) 0%, transparent 38%),
    linear-gradient(135deg, var(--c-mid) 0%, var(--c-deep) 100%);
  aspect-ratio: 16 / 9;
}

.image-frame::before {
  content: attr(data-label);
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  padding: 0.25rem 0.6rem;
  background: rgba(10, 20, 32, 0.55);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-sand);
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 32%, rgba(248, 247, 244, 0.12) 50%, transparent 68%);
  mix-blend-mode: overlay;
  pointer-events: none;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.image-frame--ratio-3-2 {
  aspect-ratio: 3 / 2;
}

.image-frame--ratio-1-1 {
  aspect-ratio: 1 / 1;
}

.image-frame--paper {
  border-color: rgba(26, 42, 58, 0.12);
  background: linear-gradient(135deg, var(--c-sand) 0%, var(--c-pearl) 100%);
}

/* 16. 滚动显现 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 17. 页脚 */
.site-footer {
  position: relative;
  background: var(--c-dark);
  color: rgba(248, 247, 244, 0.78);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-coral) 60%, var(--c-cyan) 100%);
}

.footer__shade {
  position: absolute;
  right: -8rem;
  top: 1rem;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.16) 0%, rgba(255, 127, 80, 0.05) 50%, transparent 70%);
  pointer-events: none;
}

.footer__top {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1.8fr);
  gap: clamp(2rem, 5vw, 5rem);
  padding-block: clamp(3rem, 7vw, 5rem) 2rem;
}

.footer__brand {
  display: grid;
  gap: 1.25rem;
  align-content: start;
}

.footer__note {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(248, 247, 244, 0.55);
  max-width: 42ch;
}

.footer__trust {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.footer__trust-text {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: rgba(248, 247, 244, 0.55);
  max-width: 32em;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer__heading {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.footer__list {
  display: grid;
  gap: 0.55rem;
  font-size: 0.9375rem;
}

.footer__link {
  color: rgba(248, 247, 244, 0.72);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer__link:hover {
  color: var(--c-gold);
  padding-left: 0.3rem;
}

.footer__contact-item {
  color: rgba(248, 247, 244, 0.78);
  line-height: 1.6;
}

.footer__service {
  margin-top: 1rem;
  font-size: 0.8125rem;
  color: rgba(127, 179, 213, 0.7);
}

.footer__bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(232, 220, 200, 0.12);
}

.footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.25rem;
  font-size: 0.8125rem;
  color: rgba(248, 247, 244, 0.5);
}

.footer__copyright,
.footer__icp {
  margin: 0;
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
}

.footer__legal a {
  color: rgba(248, 247, 244, 0.6);
  text-decoration: none;
}

.footer__legal a:hover {
  color: var(--c-coral);
}

/* 18. 工具类 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.text-gold {
  color: var(--c-gold);
}

.text-coral {
  color: var(--c-coral);
}

.text-cyan {
  color: var(--c-cyan);
}

.text-sand {
  color: var(--c-sand);
}

.bg-pearl {
  background: var(--c-pearl);
}

.bg-deep {
  background: var(--c-deep);
}

.bg-dark {
  background: var(--c-dark);
}

.text-center {
  text-align: center;
}

/* 19. 响应式 */
@media (max-width: 1100px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1000px) {
  .footer__top {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .grid--asym {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 880px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 1001;
    width: min(80vw, 24rem);
    padding: calc(var(--header-h) + 2rem) clamp(1.5rem, 5vw, 2.5rem) 2rem;
    background: linear-gradient(160deg, rgba(18, 59, 92, 0.96) 0%, rgba(11, 32, 54, 0.98) 100%);
    border-left: 1px solid var(--glass-border);
    box-shadow: var(--shadow-2);
    overflow-y: auto;
    visibility: hidden;
    transform: translateX(102%);
    transition: transform 0.35s var(--ease), visibility 0s linear 0.35s;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.35s var(--ease), visibility 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 0.7rem 0.2rem;
    font-size: 1.125rem;
    border-bottom: 1px solid rgba(232, 220, 200, 0.12);
  }

  .nav-link[aria-current="page"] {
    color: var(--c-gold);
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .footer__grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle__label {
    display: none;
  }

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

/* 20. 无 JS 降级 */
html:not(.js) .nav-toggle {
  display: none;
}

@media (max-width: 880px) {
  html:not(.js) .site-nav {
    position: static;
    visibility: visible;
    transform: none;
    width: auto;
    padding: 0;
    background: transparent;
    border-left: 0;
    box-shadow: none;
    overflow: visible;
  }

  html:not(.js) .nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.4rem 0.9rem;
    justify-content: flex-end;
  }

  html:not(.js) .nav-link {
    border-bottom: 0;
    padding: 0.3rem 0;
    font-size: 0.8rem;
  }
}

/* 21. 减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}