/* =========================================================
   博澳看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }

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

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

:root {
  /* 色彩 */
  --forest: #0E3A32;
  --ink: #10161A;
  --slate: #1B2A33;
  --cyan: #35F2C0;
  --amber: #E8B44A;
  --alert: #FF6B3D;
  --mist: #E8F1EE;
  --sage: #7E9B93;
  --gray: #4A5A5F;
  --amber-deep: #8A5A12;

  /* 字体 */
  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;

  /* 度量 */
  --rail-w: clamp(108px, 12vw, 172px);
  --hdr-bar: 60px;
  --edge: clamp(1rem, 4vw, 3.25rem);
  --gap: clamp(12px, 1.4vw, 20px);
  --shell: 1240px;

  --cut-lg: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  --cut-sm: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

/* ---------------- 基础排版 ---------------- */

html, body { min-height: 100%; }

body {
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 84% -12%, rgba(14, 58, 50, .9), transparent 66%),
    radial-gradient(720px 460px at -12% 106%, rgba(27, 42, 51, .92), transparent 62%),
    repeating-linear-gradient(115deg, rgba(53, 242, 192, .018) 0 1px, transparent 1px 10px),
    repeating-linear-gradient(0deg, rgba(232, 180, 74, .016) 0 1px, transparent 1px 28px);
  background-attachment: fixed;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.005em;
  color: var(--mist);
}

h1 { font-size: clamp(2rem, 5vw, 4.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.5rem); }

p { line-height: 1.75; }

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--amber); }

strong { font-weight: 700; color: var(--mist); }

::selection { background: rgba(53, 242, 192, .3); color: var(--mist); }

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------------- 工具与基础组件 ---------------- */

.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--edge);
}

.section { padding-block: clamp(2.5rem, 6vw, 5.5rem); }

.display {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1.02;
  letter-spacing: .01em;
  margin: 0 0 .5em;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

.cut { clip-path: var(--cut-lg); }
.cut--sm { clip-path: var(--cut-sm); }

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.panel {
  position: relative;
  background: var(--slate);
  clip-path: var(--cut-lg);
  padding: clamp(1.1rem, 2vw, 1.75rem);
  color: var(--mist);
}

.panel--forest { background: linear-gradient(150deg, var(--forest), #0B2B25); }
.panel--slate { background: var(--slate); }
.panel--ink { background: var(--ink); }

.panel--focus {
  box-shadow: inset 0 0 0 1px var(--cyan), inset 0 0 40px rgba(53, 242, 192, .12);
  background: linear-gradient(160deg, rgba(14, 58, 50, .95), rgba(27, 42, 51, .95));
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  padding: .24rem .55rem;
  color: var(--amber);
  border: 1px solid rgba(232, 180, 74, .45);
  background: rgba(232, 180, 74, .08);
  text-transform: uppercase;
}

.tag--cyan { color: var(--cyan); border-color: rgba(53, 242, 192, .45); background: rgba(53, 242, 192, .08); }
.tag--alert { color: var(--alert); border-color: rgba(255, 107, 61, .5); background: rgba(255, 107, 61, .1); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  font-family: var(--font-body);
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  background: transparent;
  color: var(--mist);
  border: 1px solid rgba(53, 242, 192, .45);
  clip-path: var(--cut-sm);
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.btn:hover { background: rgba(53, 242, 192, .14); border-color: var(--cyan); color: var(--mist); transform: translateY(-2px); }

.btn--primary { background: var(--cyan); color: #06231D; border-color: var(--cyan); }
.btn--primary:hover { background: var(--amber); border-color: var(--amber); color: #231703; }

.btn--amber { border-color: rgba(232, 180, 74, .55); color: var(--amber); }
.btn--amber:hover { background: rgba(232, 180, 74, .14); border-color: var(--amber); }

.media {
  position: relative;
  overflow: hidden;
  background: linear-gradient(140deg, var(--forest), var(--ink));
  clip-path: var(--cut-lg);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.08) brightness(.85);
  transition: transform .6s ease;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(53, 242, 192, .09) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(53, 242, 192, .09) 0 1px, transparent 1px 44px);
}

.media:hover img { transform: scale(1.03); }
.media--square { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--sage);
}

.crumbs a { color: var(--sage); border-bottom: 1px solid transparent; }
.crumbs a:hover { color: var(--cyan); border-bottom-color: rgba(53, 242, 192, .6); }
.crumbs li + li::before { content: "/"; margin-right: .45rem; color: var(--gray); }

.note {
  border-left: 2px solid var(--cyan);
  padding: .15rem 0 .15rem .9rem;
  color: var(--sage);
  font-size: .84rem;
  font-weight: 400;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s ease, transform .6s cubic-bezier(.2, .8, .2, 1);
  transition-delay: var(--d, 0ms);
  will-change: opacity, transform;
}

[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------------- 跳过链接 ---------------- */

.skip-link {
  position: fixed;
  top: .6rem;
  left: .6rem;
  z-index: 220;
  transform: translateY(-180%);
  padding: .58rem .95rem;
  background: var(--cyan);
  color: #06231D;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  border-radius: 2px;
  transition: transform .2s ease;
}

.skip-link:focus { transform: translateY(0); color: #06231D; }

/* ---------------- 头部：侧边轨道 ---------------- */

.site-header {
  position: fixed;
  z-index: 90;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  background: var(--ink);
  border-right: 1px solid rgba(126, 155, 147, .2);
  transition: background .3s ease;
}

.site-header.is-condensed { background: #0B1013; }

.rail {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding-bottom: 1rem;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(126, 155, 147, .4) transparent;
}

.rail::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(53, 242, 192, .05) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(118deg, rgba(232, 180, 74, .035) 0 1px, transparent 1px 17px);
}

/* 品牌文字标识 */
.brand {
  --brand-size: clamp(12px, 1.3vw, 17px);
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .3rem;
  padding: 1.35rem 1rem 1.05rem;
  text-decoration: none;
  color: var(--mist);
}

.brand__char {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--brand-size);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--mist);
}

.brand__dash {
  position: relative;
  display: block;
  width: 9px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.brand__dash::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -2px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
}

.brand:hover .brand__char { color: var(--cyan); }

.rail__tagline {
  position: relative;
  z-index: 1;
  margin: 0 1rem 1.3rem;
  padding-left: .55rem;
  border-left: 2px solid rgba(53, 242, 192, .5);
  font-size: .68rem;
  line-height: 1.55;
  letter-spacing: .04em;
  color: var(--sage);
}

/* 导航 */
.rail-nav { position: relative; z-index: 1; flex: 1 1 auto; }

.rail-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 .5rem;
}

.rail-nav a {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .58rem .6rem;
  border-left: 2px solid transparent;
  color: var(--sage);
  font-size: .8rem;
  line-height: 1.35;
  text-decoration: none;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.rail-nav__num {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .06em;
  color: var(--amber);
}

.rail-nav__label { flex: 1 1 auto; }

.rail-nav a:hover {
  color: var(--mist);
  border-left-color: var(--cyan);
  background: rgba(27, 42, 51, .85);
}

.rail-nav a[aria-current="page"] {
  color: var(--mist);
  border-left-color: var(--amber);
  background: linear-gradient(90deg, rgba(53, 242, 192, .14), transparent 92%);
}

.rail-nav a[aria-current="page"] .rail-nav__num { color: var(--cyan); }

/* 轨道底部 */
.rail__foot {
  position: relative;
  z-index: 1;
  margin-top: auto;
  display: grid;
  gap: .45rem;
  padding: 1rem .9rem 0;
  border-top: 1px solid rgba(126, 155, 147, .2);
}

.rail__contact {
  font-family: var(--font-mono);
  font-size: .6rem;
  line-height: 1.45;
  letter-spacing: .02em;
  color: var(--sage);
  word-break: break-all;
}

.rail__cta {
  display: block;
  margin-top: .3rem;
  padding: .5rem .5rem;
  text-align: center;
  font-size: .68rem;
  letter-spacing: .1em;
  text-decoration: none;
  color: #06231D;
  background: var(--cyan);
  clip-path: var(--cut-sm);
  transition: background .2s ease, color .2s ease;
}

.rail__cta:hover { background: var(--amber); color: #231703; }

/* 滚动进度 */
.rail__progress {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: rgba(126, 155, 147, .14);
  pointer-events: none;
}

.rail__progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleY(0);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--cyan), var(--amber));
}

/* 抽屉按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .72rem;
  background: transparent;
  border: 1px solid rgba(53, 242, 192, .45);
  color: var(--mist);
  font-size: .78rem;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cyan);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  transition: transform .24s ease;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open] .nav-toggle { border-color: var(--amber); color: var(--amber); }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); background: var(--amber); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); background: var(--amber); }

/* ---------------- 页脚 ---------------- */

.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  background: linear-gradient(180deg, #0C1215, var(--ink) 40%);
  border-top: 1px solid rgba(126, 155, 147, .22);
  padding: clamp(2.25rem, 4.5vw, 3.75rem) var(--edge) 1.5rem;
  color: var(--sage);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 16%, var(--amber) 58%, transparent);
  opacity: .55;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.75rem);
  max-width: var(--shell);
  margin-inline: auto;
}

.footer__brand { display: grid; gap: .75rem; align-content: start; }

.brand--footer {
  padding: 0;
  --brand-size: 1.15rem;
}

.footer__pitch {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.5vw, 1.28rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
  letter-spacing: .02em;
}

.footer__fine {
  font-size: .8rem;
  line-height: 1.7;
  color: var(--gray);
  max-width: 30ch;
}

.footer__title {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer__list { display: grid; gap: .55rem; }

.footer__list a {
  color: rgba(232, 241, 238, .78);
  font-size: .86rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.footer__list a:hover { color: var(--cyan); border-bottom-color: rgba(53, 242, 192, .6); }

.footer__text {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--sage);
  word-break: break-word;
}

.footer__text.mono { font-size: .76rem; color: rgba(232, 241, 238, .68); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  max-width: var(--shell);
  margin: clamp(2rem, 4vw, 3rem) auto 0;
  padding-top: 1.1rem;
  border-top: 1px solid rgba(74, 90, 95, .5);
}

.footer__legal {
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--gray);
}

/* ---------------- 响应式：桌面侧轨 / 移动抽屉 ---------------- */

@media (min-width: 961px) {
  body { padding-left: var(--rail-w); }
}

@media (max-width: 1100px) {
  .footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  body { padding-bottom: calc(var(--hdr-bar) + 26px); }

  .site-header {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    border-right: 0;
    border-top: 1px solid rgba(126, 155, 147, .25);
    background: rgba(16, 22, 26, .97);
  }

  .site-header.is-condensed { background: rgba(16, 22, 26, .97); }

  .rail {
    height: auto;
    min-height: var(--hdr-bar);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: .75rem;
    padding: .55rem .9rem;
    overflow: visible;
  }

  .rail::after { display: none; }

  .brand {
    padding: 0;
    --brand-size: .98rem;
    gap: .26rem;
  }

  .rail__tagline,
  .rail__foot,
  .rail__progress { display: none; }

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

  .rail-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: var(--hdr-bar);
    z-index: 95;
    max-height: 70vh;
    overflow-y: auto;
    padding: .9rem .9rem 1.1rem;
    background: linear-gradient(160deg, var(--forest), #0A2A24);
    border-top: 1px solid rgba(53, 242, 192, .35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(18px);
    transition: opacity .26s ease, transform .26s ease, visibility .26s linear;
  }

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

  .rail-nav__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .5rem;
    padding: 0;
  }

  .rail-nav a {
    padding: .78rem .7rem;
    border: 1px solid rgba(126, 155, 147, .3);
    border-left-width: 2px;
    background: rgba(16, 22, 26, .6);
    font-size: .9rem;
  }

  .grid12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .footer__top { grid-template-columns: 1fr; }
  .footer__fine { max-width: none; }
  .footer__bottom { justify-content: flex-start; }
}

/* ---------------- 动效克制 ---------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .rail__progress span { transition: none !important; }

  .media img,
  .btn,
  .footer__list a,
  .rail-nav a,
  .nav-toggle,
  .rail-nav {
    transition: none !important;
  }

  .btn:hover { transform: none; }
  .media:hover img { transform: none; }
}