/* ============================================================
   问鼎苹果主站 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { list-style: none; padding: 0; }
img, svg, video { max-width: 100%; display: block; }
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%; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; border-radius: 2px; }

:root {
  --ink-000: #06070A;
  --ink-100: #0D1016;
  --ink-200: #161A22;
  --line: #232833;
  --line-hi: #2E3745;
  --text: #E9EDF3;
  --text-mid: #A7B0BF;
  --text-dim: #6E7686;
  --text-faint: #4C5361;
  --green: #3DF2A4;
  --green-deep: #0B3B2E;
  --orange: #FF8A3D;
  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --shell: 1240px;
  --gutter: 6vw;
  --r: 3px;
  --ease: cubic-bezier(.2, .6, .25, 1);
}

body {
  background: var(--ink-000);
  color: var(--text-mid);
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  min-height: 100%;
}

h1, h2, h3, h4, h5 {
  color: var(--text);
  font-weight: 200;
  letter-spacing: .06em;
  line-height: 1.3;
}
h1 { font-size: 34px; }
h2 { font-size: 22px; }
h3 { font-size: 22px; }
h4, h5 { font-size: 17px; }
p { max-width: 72ch; }

/* ---------- 跳转与进度 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 90;
  padding: 10px 18px;
  background: var(--green-deep);
  color: var(--green);
  border: 1px solid var(--green);
  border-radius: var(--r);
  font-size: 13px;
  letter-spacing: .12em;
  transition: top .16s var(--ease);
}
.skip-link:focus { top: 14px; }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--green) 0%, var(--orange) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 页头：左右分置 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 7, 10, .9);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 15px var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-header__spacer { flex: 1 1 auto; }

.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand__sigil {
  position: relative;
  width: 14px; height: 14px;
  flex: 0 0 auto;
  border: 1px solid var(--green);
  border-radius: 1px;
  background: linear-gradient(135deg, rgba(61, 242, 164, .26), transparent 62%);
}
.brand__sigil::after {
  content: "";
  position: absolute;
  inset: 4px;
  background: var(--green);
  opacity: .85;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.18; }
.brand__name { font-size: 15px; font-weight: 300; letter-spacing: .2em; color: var(--text); }
.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--text-dim);
}
.brand__season {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding-left: 24px;
  border-left: 1px solid var(--line);
  max-width: none;
}
.brand__season-label { font-size: 11px; letter-spacing: .3em; color: var(--text-dim); }
.brand__season-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.utility { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.utility__link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.utility__link:hover { color: var(--green); border-bottom-color: rgba(61, 242, 164, .45); }
.utility__sep { width: 1px; height: 12px; background: var(--line); }

.nav { flex: 0 0 auto; }
.nav__list { display: flex; align-items: center; gap: 2px; }
.nav__item { position: relative; }
.nav__link {
  display: block;
  padding: 9px 13px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--text-mid);
  border: 1px solid transparent;
  border-radius: var(--r);
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.nav__link:hover { color: var(--text); background: var(--ink-100); border-color: var(--line); }
.nav__link[aria-current="page"] {
  position: relative;
  color: var(--green);
  background: var(--green-deep);
  border-color: rgba(61, 242, 164, .28);
}
.nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 5px; top: 50%;
  width: 3px; height: 3px;
  margin-top: -1.5px;
  border-radius: 50%;
  background: var(--green);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 9px 14px;
  background: var(--ink-100);
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--text-mid);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--line-hi); color: var(--text); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 1px;
  width: 100%;
  background: currentColor;
  transition: transform .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-2.5px) rotate(-45deg); }
.nav-toggle__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--ink-000) 0%, var(--ink-100) 34%, var(--ink-100) 100%);
  border-top: 1px solid var(--line);
}
.site-footer__watermark {
  position: absolute;
  left: -15%; right: -15%; bottom: -46%;
  height: 580px;
  opacity: .05;
  pointer-events: none;
  background: repeating-radial-gradient(circle at 50% 58%, rgba(233, 237, 243, .6) 0 1px, transparent 1px 28px);
  -webkit-mask-image: radial-gradient(58% 58% at 50% 50%, #000 0%, transparent 78%);
  mask-image: radial-gradient(58% 58% at 50% 50%, #000 0%, transparent 78%);
}

.season-bar {
  position: relative;
  z-index: 1;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(100deg, rgba(11, 59, 46, .85) 0%, rgba(13, 16, 22, .18) 46%, rgba(255, 138, 61, .1) 100%);
}
.season-bar__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 30px var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}
.season-bar__left { min-width: 0; }
.season-bar__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: var(--text-dim);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.season-track {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 2px 0 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.season-track::-webkit-scrollbar { height: 4px; }
.season-track::-webkit-scrollbar-thumb { background: var(--line); border-radius: 2px; }
.season-btn {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 8px 13px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--text-dim);
  background: var(--ink-200);
  border: 1px solid var(--line);
  border-radius: var(--r);
  font-variant-numeric: tabular-nums;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.season-btn:hover { color: var(--text); border-color: var(--line-hi); }
.season-btn.is-active {
  color: var(--orange);
  border-color: rgba(255, 138, 61, .55);
  background: rgba(255, 138, 61, .1);
}
.season-bar__hint { font-size: 12px; line-height: 1.75; color: var(--text-dim); margin-top: 8px; }

.season-metrics { display: flex; flex-wrap: wrap; gap: 14px 28px; justify-content: flex-end; }
.metric {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 96px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}
.metric__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; color: var(--text-dim); }
.metric__value {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1.2;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  transition: color .3s var(--ease);
}
.metric__value.is-pulsing { color: var(--green); }
.metric__delta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}
.metric__delta.is-down { color: var(--orange); }

.footer-cols {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 46px var(--gutter) 42px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 30px;
  border-bottom: 1px solid var(--line);
}
.footer-col__title {
  position: relative;
  padding-left: 14px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .3em;
  color: var(--text-dim);
}
.footer-col__title::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 6px; height: 1px;
  background: var(--green);
}
.footer-col__list { display: flex; flex-direction: column; }
.footer-col__link {
  position: relative;
  display: block;
  padding: 6px 0 6px 12px;
  font-size: 14px;
  color: var(--text-mid);
  transition: color .2s var(--ease);
}
.footer-col__link::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 6px; height: 1px;
  background: var(--green);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.footer-col__link:hover { color: var(--text); }
.footer-col__link:hover::before { opacity: 1; transform: translateX(0); }

.footer-base {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 22px var(--gutter) 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-dim);
}
.footer-base__brand { letter-spacing: .18em; color: var(--text-mid); }
.footer-base__line { color: var(--text-dim); }
.footer-base__copy { width: 100%; padding-top: 6px; color: var(--text-faint); }

/* ---------- 通用容器与排版 ---------- */
.shell { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 var(--gutter); }
.shell--narrow { max-width: 900px; }
.shell--wide { max-width: 1480px; }

.display-1 { font-size: clamp(44px, 6.2vw, 88px); font-weight: 200; letter-spacing: .1em; line-height: 1.08; color: var(--text); }
.display-2 { font-size: clamp(34px, 4.4vw, 56px); font-weight: 200; letter-spacing: .08em; line-height: 1.16; color: var(--text); }
.display-3 { font-size: clamp(22px, 2.4vw, 34px); font-weight: 200; letter-spacing: .06em; line-height: 1.34; color: var(--text); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.text-green { color: var(--green); }
.text-orange { color: var(--orange); }
.text-dim { color: var(--text-dim); }

.rule { border: 0; height: 1px; margin: 0; background: linear-gradient(90deg, var(--line) 0%, rgba(35, 40, 51, 0) 100%); }

.prose { max-width: 68ch; font-size: 17px; line-height: 1.9; color: var(--text-mid); }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: 22px; letter-spacing: .05em; margin-top: 1.9em; }
.prose h3 { font-size: 17px; font-weight: 300; letter-spacing: .04em; color: var(--text); margin-top: 1.6em; }
.prose ul { display: flex; flex-direction: column; gap: .5em; }
.prose li { position: relative; padding-left: 18px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: .85em;
  width: 8px; height: 1px;
  background: var(--text-dim);
}
.prose strong { font-weight: 400; color: var(--text); }
.prose a { color: var(--green); border-bottom: 1px solid rgba(61, 242, 164, .3); }

/* ---------- 画板章节 ---------- */
.panel { position: relative; border-top: 1px solid var(--line); padding: 72px 0; }
.panel--tight { padding: 44px 0; }
.panel--flush { padding-top: 0; border-top: 0; }
.panel__head {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-bottom: 34px;
}
.panel__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--text-dim);
  padding-top: 9px;
}
.panel__title { font-size: clamp(22px, 2.4vw, 34px); font-weight: 200; letter-spacing: .06em; line-height: 1.34; color: var(--text); }
.panel__note { margin-top: 12px; max-width: 64ch; font-size: 13px; line-height: 1.8; color: var(--text-dim); }
.panel__body { min-width: 0; }

/* ---------- 网格与分栏 ---------- */
.grid { display: grid; gap: 20px; }
.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)); }

.split { display: grid; grid-template-columns: minmax(0, 62fr) minmax(0, 38fr); gap: 52px; align-items: start; }
.split--flip { grid-template-columns: minmax(0, 38fr) minmax(0, 62fr); }
.split__aside { padding-top: 56px; min-width: 0; }

/* ---------- 卡片与标签 ---------- */
.card {
  position: relative;
  padding: 22px;
  background: var(--ink-100);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: border-color .2s var(--ease), background-color .2s var(--ease), box-shadow .2s var(--ease);
}
.card:hover {
  border-color: var(--line-hi);
  background: var(--ink-200);
  box-shadow: 0 12px 24px rgba(0, 0, 0, .28);
}
.card__index { font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; color: var(--text-dim); }
.card__title { margin: 10px 0 8px; font-size: 22px; font-weight: 200; letter-spacing: .04em; color: var(--text); }
.card__text { font-size: 15px; line-height: 1.85; color: var(--text-mid); }
.card__meta { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  display: inline-block;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--text-dim);
  background: var(--ink-200);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.tag--green { color: var(--green); background: var(--green-deep); border-color: rgba(61, 242, 164, .35); }
.tag--orange { color: var(--orange); background: rgba(255, 138, 61, .1); border-color: rgba(255, 138, 61, .4); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--text);
  background: var(--ink-100);
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.btn:hover { color: var(--green); border-color: rgba(61, 242, 164, .45); background: var(--green-deep); }
.btn--accent { color: var(--green); background: var(--green-deep); border-color: rgba(61, 242, 164, .4); }
.btn--ghost { background: transparent; }
.btn--sm { padding: 7px 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-top: 20px; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb__item[aria-current="page"] { color: var(--text-mid); }
.breadcrumb__link { color: var(--text-dim); transition: color .2s var(--ease); }
.breadcrumb__link:hover { color: var(--green); }
.breadcrumb__sep { color: var(--line-hi); }

/* ---------- 数据行 ---------- */
.data-list { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.data-list__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.data-list__key { font-family: var(--font-mono); font-size: 13px; color: var(--text-dim); }
.data-list__val { font-family: var(--font-mono); font-size: 13px; color: var(--text-mid); font-variant-numeric: tabular-nums; }

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background-color: var(--ink-200);
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: center center;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.media--flat { background-image: none; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media > img,
.media > picture,
.media > picture > img,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--text-dim);
}
.figure { display: block; width: 100%; }

/* ---------- 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
html.js [data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .utility { display: none; }
}
@media (max-width: 1024px) {
  .nav__link { padding: 9px 10px; font-size: 12.5px; letter-spacing: .06em; }
  .brand__season { padding-left: 18px; }
  .split { gap: 36px; }
}

@media (max-width: 960px) {
  .site-header__inner { gap: 14px; padding: 14px var(--gutter); }
  .brand__season { display: none; }
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    left: 0; right: 0; top: 100%;
    display: none;
    padding: 6px var(--gutter) 18px;
    background: var(--ink-100);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 24px rgba(0, 0, 0, .35);
  }
  .nav[data-open="true"] { display: block; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__item + .nav__item { border-top: 1px solid var(--line); }
  .nav__link {
    padding: 15px 4px 15px 14px;
    font-size: 15px;
    letter-spacing: .1em;
    border: 0;
    border-radius: 0;
    background: transparent;
  }
  .nav__link:hover { background: var(--ink-200); border-color: transparent; }
  .nav__link[aria-current="page"] { background: transparent; border-color: transparent; color: var(--green); }
  .nav__link[aria-current="page"]::before {
    left: 0; top: 0; bottom: 0;
    width: 2px; height: auto;
    margin-top: 0;
    border-radius: 0;
  }

  .season-bar__inner { grid-template-columns: 1fr; gap: 22px; padding: 26px var(--gutter); }
  .season-metrics { justify-content: flex-start; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px; padding: 36px var(--gutter) 32px; }

  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split, .split--flip { grid-template-columns: 1fr; gap: 28px; }
  .split__aside { padding-top: 0; }
  .panel { padding: 56px 0; }
  .panel--tight { padding: 36px 0; }
}

@media (max-width: 720px) {
  .panel__head { grid-template-columns: 1fr; gap: 8px; margin-bottom: 26px; }
  .panel__index { padding-top: 0; }
  body { font-size: 16px; }
  .prose { font-size: 16px; }
}

@media (max-width: 560px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; gap: 22px; }
  .data-list__row { grid-template-columns: 1fr; gap: 6px; }
  .brand__sub { display: none; }
  .metric { padding-left: 12px; }
  .metric__value { font-size: 20px; }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}