/* ============================================================
   K8 经典版 · 共享样式表 /assets/site.css
   顺序：reset → 变量 → 中文排版 → 布局 → 通用组件 → 头部 → 页脚 → 响应式
   ============================================================ */

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

html, body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dd, dt { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0A0C0F;
  --graphite: #14181D;
  --line: #262C33;
  --silver: #C2C8CE;
  --gray: #6D747C;
  --mist: #F2F4F6;
  --orange: #FF6A2B;
  --orange-soft: #FF854F;
  --cyan: #2ED3CE;
  --cyan-deep: #0F3B3E;
  --amber-deep: #4A2415;

  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --maxw: 1280px;
  --gut: clamp(1.25rem, 4vw, 2.5rem);
  --radius-cut: 18px;
  --ease: cubic-bezier(.22, .68, .24, 1);
}

/* ---------- 3. 中文排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background: var(--ink);
  color: var(--silver);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.85;
  font-weight: 400;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, .display-1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -.028em;
  color: var(--mist);
}

h2, .display-2 {
  font-size: clamp(1.55rem, 3vw, 2rem);
  line-height: 1.24;
  font-weight: 700;
  letter-spacing: -.012em;
  color: var(--mist);
}

h3 {
  font-size: 1.15rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--mist);
}

h4 {
  font-size: .95rem;
  line-height: 1.5;
  font-weight: 600;
  color: var(--silver);
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--mono);
  font-size: .72rem;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gray);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--orange);
  flex: none;
}

.lede {
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  color: var(--silver);
  max-width: 62ch;
}

.muted { color: var(--gray); }

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

/* 焦点可见 */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 4. 布局 ---------- */
.container {
  width: min(100% - (var(--gut) * 2), var(--maxw));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section--flush { padding-top: 0; }
.section--graphite { background: var(--graphite); }

.section--mist {
  background: var(--mist);
  color: var(--ink);
}

.section--mist h1,
.section--mist h2,
.section--mist h3,
.section--mist .display-1,
.section--mist .display-2 { color: var(--ink); }

.section--mist .lede { color: #333A42; }
.section--mist .muted { color: #5A626B; }
.section--mist .eyebrow { color: #5A626B; }

.hairline {
  height: 1px;
  width: 100%;
  background: var(--line);
  border: 0;
}

.section--mist .hairline { background: #D6DBE0; }

.stack > * + * { margin-top: var(--stack-gap, 1rem); }

.grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.9rem);
}

.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--3-4-5 { grid-template-columns: 3fr 4fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }
.grid--4-8 { grid-template-columns: 4fr 8fr; }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 5. 通用组件 ---------- */
.panel {
  position: relative;
  background: var(--graphite);
  color: var(--silver);
  padding: clamp(1.1rem, 2.4vw, 2rem);
  clip-path: polygon(
    var(--radius-cut) 0,
    100% 0,
    100% calc(100% - var(--radius-cut)),
    calc(100% - var(--radius-cut)) 100%,
    0 100%,
    0 var(--radius-cut)
  );
}

.panel--mist { background: var(--mist); color: var(--ink); }
.panel--mist h2, .panel--mist h3 { color: var(--ink); }

.panel--flat { background: transparent; clip-path: none; padding: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-family: var(--sans);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
  padding: .76rem 1.4rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--silver);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #13100D;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%);
}

.btn--primary:hover { background: var(--orange-soft); border-color: var(--orange-soft); }

.btn--ghost {
  border-color: var(--line);
  color: var(--silver);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(46, 211, 206, .08);
}

.btn--quiet {
  padding: .3rem 0;
  color: var(--cyan);
  border-radius: 0;
  border-bottom: 1px solid var(--cyan-deep);
}

.btn--quiet:hover { border-bottom-color: var(--cyan); }

.btn--sm {
  font-size: .8rem;
  padding: .5rem 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .08em;
  line-height: 1.4;
  padding: .22rem .6rem;
  border: 1px solid var(--cyan-deep);
  background: rgba(46, 211, 206, .1);
  color: var(--cyan);
}

.tag--orange {
  border-color: var(--amber-deep);
  background: rgba(255, 106, 43, .12);
  color: var(--orange);
}

.tag--mute {
  border-color: var(--line);
  background: transparent;
  color: var(--gray);
}

.spec-table {
  width: 100%;
  font-size: .88rem;
  border-collapse: collapse;
}

.spec-table caption {
  text-align: left;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--gray);
  padding-bottom: .7rem;
}

.spec-table th {
  text-align: left;
  font-family: var(--mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--gray);
  padding: .7rem .8rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.spec-table td {
  padding: .85rem .8rem;
  border-bottom: 1px solid var(--line);
  color: var(--silver);
  vertical-align: top;
}

.spec-table tbody tr { transition: background-color .18s var(--ease); }
.spec-table tbody tr:hover { background: rgba(46, 211, 206, .06); }

.section--mist .spec-table th { border-bottom-color: #D6DBE0; }
.section--mist .spec-table td { border-bottom-color: #D6DBE0; color: var(--ink); }

.media {
  position: relative;
  overflow: hidden;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, .035) 0 1px, transparent 1px 12px),
    var(--graphite);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.media__inner {
  position: relative;
  width: 100%;
  height: 100%;
}

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

.media__cap {
  display: block;
  position: absolute;
  left: 0;
  bottom: 0;
  padding: .45rem .8rem;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--silver);
  background: rgba(10, 12, 15, .78);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }

.breadcrumbs {
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .1em;
  color: var(--gray);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
}

.breadcrumbs li { display: inline-flex; align-items: center; gap: .45rem; }

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  color: var(--line);
}

.breadcrumbs a { color: var(--gray); transition: color .18s var(--ease); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--silver); }

/* 滚动进度线（由 JS 插入，页面也可自行放置） */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  z-index: 200;
  pointer-events: none;
}

/* 滚动显现 */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

/* ---------- 6. 头部 ---------- */
.skip-link {
  position: fixed;
  left: 1rem;
  top: 0;
  z-index: 220;
  transform: translateY(-140%);
  background: var(--orange);
  color: #13100D;
  font-weight: 700;
  font-size: .85rem;
  padding: .6rem 1.1rem;
  transition: transform .2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}

/* 上一道：档案条 */
.header-rail {
  background: var(--graphite);
  border-bottom: 1px solid var(--line);
}

.header-rail__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: .45rem;
  font-size: .72rem;
  line-height: 1.5;
}

.header-rail__tag {
  color: var(--gray);
  letter-spacing: .06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-rail__meta {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--gray);
  white-space: nowrap;
}

.header-rail__num {
  color: var(--cyan);
  margin-right: .3rem;
}

.header-rail__mail {
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--cyan);
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.header-rail__mail:hover { border-bottom-color: var(--cyan); }

/* 下一道：品牌 + 栏目 */
.header-main { position: relative; }

.header-main__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding-block: clamp(.75rem, 1.6vw, 1.1rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  flex: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--orange);
  color: #13100D;
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .04em;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .07em;
  line-height: 1.25;
  color: var(--mist);
}

.brand__sub {
  display: block;
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .16em;
  color: var(--gray);
  line-height: 1.5;
}

/* 移动端抽屉按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .5rem .85rem;
  border: 1px solid var(--line);
  color: var(--silver);
  font-size: .78rem;
  letter-spacing: .1em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

.nav-toggle__bars {
  display: block;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: currentColor;
}

.nav-toggle__bars i + i { margin-top: 4px; }

.nav-toggle__bars i:last-child { width: 60%; }

/* 主栏目导航 */
.primary-nav { display: block; }

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2.6vw, 2.6rem);
}

.primary-nav__list a {
  position: relative;
  display: inline-block;
  padding: .3rem 0 .5rem;
  font-size: .92rem;
  letter-spacing: .07em;
  color: var(--silver);
  white-space: nowrap;
  transition: color .2s var(--ease);
}

.primary-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--orange);
  transition: width .26s var(--ease);
}

.primary-nav__list a:hover { color: var(--mist); }
.primary-nav__list a:hover::after { width: 100%; }

.primary-nav__list a[aria-current="page"] { color: var(--mist); }
.primary-nav__list a[aria-current="page"]::after { width: 100%; }

.primary-nav__foot { display: none; }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  border-top: 1px solid var(--line);
  color: var(--silver);
  font-size: .88rem;
}

.footer-top {
  padding-block: clamp(2.4rem, 5vw, 4rem);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(46, 211, 206, .08), transparent 62%),
    var(--ink);
}

.footer-top__inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: clamp(1.8rem, 4vw, 3.5rem);
}

.footer-brand .brand { margin-bottom: 1rem; }

.footer-brand__note {
  font-size: .8rem;
  color: var(--gray);
  max-width: 34ch;
  margin-bottom: 1.2rem;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}

.footer-col__title {
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--mist);
  padding-bottom: .55rem;
  margin-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}

.footer-list li + li { margin-top: .45rem; }

.footer-list a {
  display: inline-flex;
  align-items: center;
  font-size: .84rem;
  color: var(--silver);
  opacity: .86;
  transition: color .18s var(--ease), opacity .18s var(--ease);
}

.footer-list a::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 1px;
  margin-right: 0;
  background: var(--cyan);
  transition: width .22s var(--ease), margin-right .22s var(--ease);
}

.footer-list a:hover { color: var(--cyan); opacity: 1; }
.footer-list a:hover::before { width: 12px; margin-right: .5rem; }

.footer-bottom {
  background: var(--graphite);
  border-top: 1px solid var(--line);
  padding-block: clamp(1.4rem, 3vw, 2rem);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.8rem;
  font-size: .82rem;
  color: var(--silver);
}

.footer-contact__item { display: inline-flex; align-items: baseline; }

.footer-contact__key {
  font-size: .64rem;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-right: .55rem;
}

.footer-note {
  margin-top: .85rem;
  font-size: .78rem;
  color: var(--gray);
  max-width: 72ch;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem 1.6rem;
  margin-top: 1.15rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-size: .76rem;
  color: var(--gray);
}

.footer-legal__links a { color: var(--silver); transition: color .18s var(--ease); }
.footer-legal__links a:hover { color: var(--cyan); }

.footer-legal__sep {
  margin-inline: .5rem;
  color: var(--line);
}

/* ---------- 8. 响应式 ---------- */
@media (min-width: 1180px) {
  .header-main__inner {
    display: grid;
    grid-template-columns: minmax(0, auto) minmax(0, 1fr);
    align-items: end;
    column-gap: clamp(2rem, 6vw, 5rem);
  }

  .primary-nav {
    justify-self: end;
    padding-bottom: .9rem;
  }

  .primary-nav__list { gap: clamp(1.6rem, 2.8vw, 3.1rem); }
}

@media (max-width: 1180px) {
  .footer-top__inner { grid-template-columns: 1fr; }
}

@media (max-width: 1000px) {
  .grid--5-7,
  .grid--3-4-5,
  .grid--8-4,
  .grid--4-8 { grid-template-columns: 1fr; }

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

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--ink);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 1rem var(--gut) 1.6rem;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .55);
    animation: navIn .22s var(--ease) both;
  }

  .primary-nav[data-open] { display: block; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__list li + li { border-top: 1px solid var(--line); }

  .primary-nav__list a {
    display: block;
    padding: .85rem 0;
    font-size: 1rem;
  }

  .primary-nav__list a::after { bottom: .55rem; }

  .primary-nav__foot {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .8rem 1.2rem;
    margin-top: 1.1rem;
    padding-top: 1.1rem;
    border-top: 1px solid var(--line);
  }

  .primary-nav__mail {
    font-size: .74rem;
    letter-spacing: .04em;
    color: var(--cyan);
    overflow-wrap: anywhere;
  }
}

@media (max-width: 760px) {
  .header-rail__tag { display: none; }
  .header-rail__inner { gap: .8rem; }
  .grid--thirds { grid-template-columns: 1fr; }
  .grid--halves { grid-template-columns: 1fr; }
  .footer-contact { font-size: .78rem; }
}

@media (max-width: 520px) {
  .header-rail__meta { display: none; }
  .header-rail__mail { font-size: .66rem; }
  .nav-toggle__label { display: none; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 9. 减动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

  .scroll-progress { display: none; }
}