/* ============================================================
   美狮贵宾梯子 · 共享样式 /assets/site.css
   设计语言：赛博阶梯 × 东方礼序 —— 堆叠画板 / 框架式导航 / 切角与刻度
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink-900);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #050B18;
  --ink-800: #071426;
  --ink-700: #0B1F3A;
  --panel: #102A4A;
  --cyan: #2BF5D4;
  --gold: #F5B84B;
  --violet: #6C4DFF;
  --mist: #8AA4C8;
  --text: #E6F1FF;
  --coral: #FF6B8A;

  --line: rgba(43, 245, 212, 0.22);
  --line-soft: rgba(138, 164, 200, 0.18);
  --line-gold: rgba(245, 184, 75, 0.42);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "HarmonyOS Sans SC", "Alibaba PuHuiTi", "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --wrap: 1200px;
  --gutter: clamp(1rem, 4vw, 2.75rem);
  --header-h: 68px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.012em;
  color: #ffffff;
}

h1 { font-size: clamp(2.6rem, 6vw, 5.8rem); line-height: 1.04; }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); line-height: 1.3; }

.section-title { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.12; letter-spacing: -0.015em; }

.lead {
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  line-height: 1.85;
  color: rgba(230, 241, 255, 0.82);
  max-width: 62ch;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.prose { max-width: 68ch; }
.prose p { margin-block: 0 1.15em; color: rgba(230, 241, 255, 0.86); }
.prose h2 { margin-block: 2rem 0.8rem; }
.prose h3 { margin-block: 1.6rem 0.6rem; }
.prose ul { margin-block: 0 1.15em; }
.prose li {
  position: relative;
  padding-inline-start: 1rem;
  margin-block-end: 0.5rem;
  color: rgba(230, 241, 255, 0.86);
}
.prose li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 0.85em;
  width: 7px;
  height: 1px;
  background-color: var(--cyan);
  box-shadow: 0 0 6px rgba(43, 245, 212, 0.7);
}
.prose strong { color: var(--gold); font-weight: 700; }

/* ---------- 4. 可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.skip-link {
  position: absolute;
  inset-block-start: -120px;
  inset-inline-start: 1rem;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background-color: var(--cyan);
  color: #04121F;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: inset-block-start 0.2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { inset-block-start: 0.7rem; outline-offset: 2px; }

#main-content { display: block; }

/* ---------- 5. 布局工具 ---------- */
.wrap {
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(3rem, 7vw, 6rem); }
.section--tight { padding-block: clamp(2rem, 4vw, 3.2rem); }

.stack { display: flex; flex-direction: column; gap: clamp(1rem, 2vw, 1.6rem); }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.75rem); }
.grid--2 { 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)); }

@media (max-width: 1020px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.25rem;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), box-shadow 0.18s var(--ease),
              transform 0.18s var(--ease);
}
.btn--gold {
  background-color: var(--gold);
  border-color: var(--gold);
  color: #201301;
}
.btn--gold:hover {
  background-color: #FFC866;
  border-color: #FFC866;
  box-shadow: 0 0 18px rgba(245, 184, 75, 0.45);
}
.btn--gold:active { transform: translateY(1px); }

.btn--ghost {
  background-color: rgba(43, 245, 212, 0.06);
  border-color: rgba(43, 245, 212, 0.45);
  color: var(--cyan);
}
.btn--ghost:hover {
  background-color: rgba(43, 245, 212, 0.14);
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(43, 245, 212, 0.28);
}
.btn--sm { padding: 0.5rem 0.88rem; font-size: 0.82rem; }

/* ---------- 7. 索引、框景与面板 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background-color: var(--cyan);
  box-shadow: 0 0 8px rgba(43, 245, 212, 0.85);
}

.frame { position: relative; }
.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 1px solid rgba(43, 245, 212, 0.75);
  pointer-events: none;
}
.frame::before {
  inset-block-start: -1px;
  inset-inline-start: -1px;
  border-inline-end: 0;
  border-block-end: 0;
}
.frame::after {
  inset-block-end: -1px;
  inset-inline-end: -1px;
  border-inline-start: 0;
  border-block-start: 0;
}

.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  background-image: linear-gradient(165deg, rgba(16, 42, 74, 0.92), rgba(11, 31, 58, 0.78));
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.panel--accent {
  border-color: var(--line-gold);
  box-shadow: inset 0 1px 0 rgba(245, 184, 75, 0.16), 0 0 26px rgba(245, 184, 75, 0.08);
}
.panel--cut {
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.breadcrumb a:hover { color: var(--cyan); border-block-end-color: rgba(43, 245, 212, 0.6); }
.breadcrumb__sep { opacity: 0.5; }

/* ---------- 9. 图片容器基础 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid rgba(43, 245, 212, 0.2);
  border-radius: var(--radius);
  background-image: linear-gradient(150deg, #0B1F3A 0%, #050B18 58%, #102A4A 100%);
}
.media-frame::before { content: ""; display: block; padding-block-start: 56.25%; }
.media-frame > img,
.media-frame > picture,
.media-frame > svg,
.media-frame__inner {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide::before { padding-block-start: 42%; }
.media-frame--square::before { padding-block-start: 100%; }
.media-frame--tall::before { padding-block-start: 128%; }
.media-frame--soft {
  border-color: rgba(138, 164, 200, 0.2);
  background-image: linear-gradient(150deg, #071426 0%, #0B1F3A 100%);
}

/* ---------- 10. 头部（框架式导航） ---------- */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 90;
  isolation: isolate;
  color: var(--text);
  background-image: linear-gradient(180deg, rgba(5, 11, 24, 0.98) 0%, rgba(7, 20, 38, 0.94) 100%);
  border-block-end: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.site-header::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: -1px;
  height: 1px;
  background-image: linear-gradient(90deg, transparent 0%, var(--cyan) 18%, var(--violet) 52%, var(--gold) 84%, transparent 100%);
  opacity: 0.7;
  pointer-events: none;
}
.site-header::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-start: 0;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, rgba(43, 245, 212, 0.28) 0 1px, transparent 1px 16px);
  opacity: 0.55;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  min-height: var(--header-h);
  padding-block: 0.55rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  color: var(--text);
  text-decoration: none;
}
.brand__mark {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 3px;
  width: 26px;
  height: 26px;
}
.brand__mark span { display: block; height: 4px; background-color: var(--cyan); box-shadow: 0 0 9px rgba(43, 245, 212, 0.55); }
.brand__mark span:nth-child(1) { width: 26px; }
.brand__mark span:nth-child(2) { width: 18px; background-color: var(--violet); box-shadow: 0 0 9px rgba(108, 77, 255, 0.6); }
.brand__mark span:nth-child(3) { width: 10px; background-color: var(--gold); box-shadow: 0 0 9px rgba(245, 184, 75, 0.6); }
.brand__text { display: flex; flex-direction: column; line-height: 1.28; }
.brand__line {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.96rem;
  letter-spacing: 0.02em;
  color: #ffffff;
}
.brand__tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  white-space: nowrap;
}
.brand--footer .brand__line { font-size: 1.06rem; }
.brand--footer .brand__tag { font-size: 0.64rem; }

/* 导航 */
.nav { margin-inline-start: auto; }
.nav__list { display: flex; align-items: center; gap: 0.1rem; }
.nav__item { display: block; }
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.38rem;
  padding: 0.55rem 0.62rem;
  color: var(--mist);
  font-size: 0.9rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}
.nav__link:hover { color: var(--text); }
.nav__link::after {
  content: "";
  position: absolute;
  inset-inline: 0.62rem;
  inset-block-end: 0.22rem;
  height: 1px;
  background-color: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}
.nav__link:hover::after { transform: scaleX(1); }
.nav__index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: rgba(138, 164, 200, 0.72);
  transition: color 0.18s var(--ease);
}
.nav__label { white-space: nowrap; }
.nav__link[aria-current="page"] { color: #ffffff; }
.nav__link[aria-current="page"] .nav__index { color: var(--gold); }
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--gold);
  box-shadow: 0 0 8px rgba(245, 184, 75, 0.65);
}

/* 头部操作区 */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex: 0 0 auto;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 42px;
  padding: 0;
  place-items: center;
  align-content: center;
  gap: 4px;
  background-color: rgba(43, 245, 212, 0.06);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-toggle:hover { background-color: rgba(43, 245, 212, 0.14); }
.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--cyan);
  box-shadow: 0 0 8px rgba(43, 245, 212, 0.5);
  transition: transform 0.24s var(--ease), opacity 0.18s var(--ease);
}
.site-header[data-open] .nav-toggle {
  background-color: rgba(43, 245, 212, 0.16);
  border-color: var(--cyan);
}
.site-header[data-open] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  inset-block-end: -1px;
  inset-inline-start: 0;
  width: 0%;
  height: 2px;
  z-index: 2;
  pointer-events: none;
  background-image: linear-gradient(90deg, var(--cyan), var(--gold));
  box-shadow: 0 0 10px rgba(43, 245, 212, 0.6);
  transition: width 0.08s linear;
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  color: var(--text);
  background-image:
    radial-gradient(120% 90% at 84% 0%, rgba(108, 77, 255, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
  border-block-start: 1px solid var(--line);
}

.site-footer__steps {
  display: flex;
  align-items: flex-end;
  gap: clamp(6px, 1.2vw, 14px);
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  height: 62px;
  padding-block-start: 20px;
  border-block-end: 1px solid rgba(43, 245, 212, 0.14);
}
.site-footer__steps span {
  display: block;
  flex: 1 1 0;
  height: 26%;
  transform: skewX(-28deg);
  border-block-start: 1px solid rgba(43, 245, 212, 0.55);
  background-image: linear-gradient(180deg, rgba(43, 245, 212, 0.34), rgba(43, 245, 212, 0));
}
.site-footer__steps span:nth-child(2) {
  height: 44%;
  border-block-start-color: rgba(108, 77, 255, 0.6);
  background-image: linear-gradient(180deg, rgba(108, 77, 255, 0.36), rgba(108, 77, 255, 0));
}
.site-footer__steps span:nth-child(3) { height: 62%; }
.site-footer__steps span:nth-child(4) {
  height: 80%;
  border-block-start-color: rgba(245, 184, 75, 0.6);
  background-image: linear-gradient(180deg, rgba(245, 184, 75, 0.34), rgba(245, 184, 75, 0));
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 2.15fr);
  gap: clamp(1.6rem, 4vw, 3.4rem);
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: clamp(2.2rem, 5vw, 3.6rem) clamp(1.6rem, 4vw, 2.6rem);
}

.site-footer__lead { display: flex; flex-direction: column; gap: 0.85rem; }
.site-footer__summary {
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(230, 241, 255, 0.78);
}
.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.4rem, 3vw, 2.6rem);
}

.footer-col { min-width: 0; }
.footer-col__title {
  margin-block-end: 0.9rem;
  padding-block-end: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--cyan);
  border-block-end: 1px solid rgba(43, 245, 212, 0.18);
}
.footer-col__list { margin: 0; }
.footer-col__item {
  display: grid;
  grid-template-columns: 3.1rem minmax(0, 1fr);
  gap: 0.5rem;
  padding-block: 0.45rem;
  border-block-end: 1px dashed rgba(138, 164, 200, 0.16);
}
.footer-col__key {
  padding-block-start: 0.18em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.footer-col__val {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(230, 241, 255, 0.9);
  overflow-wrap: anywhere;
}
.footer-col__note {
  margin-block-start: 0.85rem;
  font-size: 0.8rem;
  line-height: 1.8;
  color: rgba(138, 164, 200, 0.92);
}

.footer-link {
  display: inline-block;
  padding-block: 0.28rem;
  font-size: 0.93rem;
  color: var(--mist);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-link:hover { color: var(--cyan); border-block-end-color: rgba(43, 245, 212, 0.55); }

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: 1.1rem 1.6rem;
  border-block-start: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.site-footer__copy { margin: 0; }
.site-footer__stamp { margin: 0; color: rgba(43, 245, 212, 0.7); }

/* ---------- 12. 显现 ---------- */
.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
  will-change: opacity, transform;
}
.has-reveal [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .site-header__inner { row-gap: 0; }
  .nav {
    order: 5;
    flex: 1 0 100%;
    display: none;
    margin-inline-start: 0;
    margin-block-start: 0.5rem;
    padding-block: 0.5rem 0.9rem;
    border-block-start: 1px solid var(--line-soft);
  }
  .site-header[data-open] .nav { display: block; animation: navIn 0.22s var(--ease) both; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__link {
    justify-content: flex-start;
    padding: 0.85rem 0.4rem;
    font-size: 1rem;
    border-block-end: 1px dashed rgba(138, 164, 200, 0.16);
  }
  .nav__link::after { display: none; }
  .nav__link[aria-current="page"] {
    color: var(--gold);
    background-image: linear-gradient(90deg, rgba(245, 184, 75, 0.14), transparent 72%);
  }
  .nav__link[aria-current="page"] .nav__index { color: var(--gold); }
  .site-header__actions { margin-inline-start: auto; }
  .nav-toggle { display: grid; }
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 640px) {
  :root { --header-h: 62px; }
  .brand__tag { font-size: 0.56rem; letter-spacing: 0.12em; }
  .site-header__actions .btn { display: none; }
  .site-footer__steps { height: 46px; padding-block-start: 14px; }
  .site-footer__cols { grid-template-columns: minmax(0, 1fr); }
  .site-footer__base { flex-direction: column; align-items: flex-start; }
  .footer-col__item { grid-template-columns: 2.8rem minmax(0, 1fr); }
}

@media (max-width: 380px) {
  .brand__line { font-size: 0.88rem; }
}

/* ---------- 14. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .has-reveal [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}