/* ============================================================
   非凡体育 · 共享样式表  /assets/site.css
   深空蓝基底 + 电光橙 / 荧光绿数据高亮
   ============================================================ */

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

:root {
  /* 色阶 */
  --ff-night: #04091A;
  --ff-screen: #0B1730;
  --ff-board: #132444;
  --ff-line: #1F3560;
  --ff-mist: #35507F;
  --ff-ink-2: #93A9CC;
  --ff-ink: #E8F0FF;
  --ff-orange: #FF6A1E;
  --ff-orange-soft: #FFB37A;
  --ff-green: #3BF0A2;
  --ff-red: #FF5470;
  --ff-gray: #6B7A99;

  /* 字体 */
  --ff-font-display: 'Archivo Black', 'Anton', 'HarmonyOS Sans SC', 'Source Han Sans SC', 'Noto Sans SC', sans-serif;
  --ff-font-head: 'HarmonyOS Sans SC', 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ff-font-body: 'Inter', 'Noto Sans SC', 'HarmonyOS Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ff-font-data: 'JetBrains Mono', 'IBM Plex Mono', 'Roboto Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  /* 尺度 */
  --ff-fs-1: 12px;
  --ff-fs-2: 14px;
  --ff-fs-3: 16px;
  --ff-fs-4: 20px;
  --ff-fs-5: 28px;
  --ff-fs-6: 40px;
  --ff-fs-7: 64px;
  --ff-fs-8: 96px;

  --ff-w: 1320px;
  --ff-gutter: clamp(18px, 4vw, 56px);
  --ff-header-h: 74px;
  --ff-radius: 4px;
  --ff-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ff-t: 280ms;
}

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

body {
  margin: 0;
  background-color: var(--ff-night);
  background-image:
    radial-gradient(760px 420px at 88% -6%, rgba(255, 106, 30, 0.13), transparent 68%),
    radial-gradient(620px 380px at 6% 4%, rgba(59, 240, 162, 0.07), transparent 66%);
  background-repeat: no-repeat;
  color: var(--ff-ink);
  font-family: var(--ff-font-body);
  font-size: var(--ff-fs-3);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.ff-lock { overflow: hidden; }

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

h1, h2, h3, h4 {
  font-family: var(--ff-font-head);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; }

a { color: var(--ff-orange); text-decoration: none; }

ul, ol { margin: 0; padding: 0; }

::selection { background: var(--ff-orange); color: var(--ff-night); }

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

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

#main-content { scroll-margin-top: calc(var(--ff-header-h) + 16px); }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ---------------- 布局骨架 ---------------- */

.ff-container {
  width: 100%;
  max-width: var(--ff-w);
  margin-inline: auto;
  padding-inline: var(--ff-gutter);
}

.ff-section {
  position: relative;
  padding-block: clamp(40px, 6.5vw, 88px);
}

.ff-section--roomy { padding-block: clamp(64px, 11vw, 168px); }
.ff-section--tight { padding-block: clamp(24px, 3.5vw, 48px); }
.ff-section--screen { background: var(--ff-screen); }
.ff-section--board { background: var(--ff-board); }

.ff-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 48px);
}

.ff-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 32px);
}

@media (min-width: 900px) {
  .ff-layout--aside { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }
  .ff-layout--index { grid-template-columns: minmax(0, 2fr) minmax(0, 7fr) minmax(0, 3fr); }
  .ff-layout--split { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ff-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ff-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ff-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------------- 章节标题 ---------------- */

.ff-chapter {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 16px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--ff-line);
}

.ff-chapter__num {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--ff-fs-2);
  letter-spacing: 0.1em;
  color: var(--ff-orange);
  padding-bottom: 6px;
  white-space: nowrap;
}

.ff-chapter__num::after {
  content: "";
  display: inline-block;
  width: 22px;
  height: 2px;
  margin-left: 10px;
  vertical-align: middle;
  background: var(--ff-orange);
}

.ff-chapter__title {
  margin: 0;
  font-family: var(--ff-font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.ff-chapter__note {
  margin-left: auto;
  padding-bottom: 6px;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-gray);
}

/* ---------------- 文本 ---------------- */

.ff-display {
  font-family: var(--ff-font-display);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.ff-prose {
  max-width: 68em;
  font-size: var(--ff-fs-3);
  line-height: 1.85;
  color: var(--ff-ink);
}

.ff-prose p { margin: 0 0 1.1em; }

.ff-prose a {
  color: var(--ff-orange);
  text-decoration: underline;
  text-decoration-color: rgba(255, 106, 30, 0.45);
  text-underline-offset: 3px;
  transition: color 200ms var(--ff-ease), text-decoration-color 200ms var(--ff-ease);
}

.ff-prose a:hover { color: var(--ff-orange-soft); text-decoration-color: var(--ff-orange-soft); }

.ff-prose strong { color: var(--ff-ink); font-weight: 700; }

.ff-prose ul, .ff-prose ol { margin: 0 0 1.1em; padding-left: 1.4em; }

.ff-prose li { margin-bottom: 0.35em; }

.ff-note {
  border-left: 2px solid var(--ff-orange);
  padding: 2px 0 2px 16px;
  font-size: var(--ff-fs-2);
  line-height: 1.75;
  color: var(--ff-ink-2);
}

.ff-data {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.ff-kpi { display: flex; flex-direction: column; gap: 4px; }

.ff-kpi__value {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--ff-ink);
}

.ff-kpi__label {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
  color: var(--ff-gray);
}

.ff-delta {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.ff-delta--up { color: var(--ff-green); }
.ff-delta--down { color: var(--ff-red); }

/* ---------------- 卡片 ---------------- */

.ff-card {
  background: var(--ff-board);
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  padding: clamp(16px, 2vw, 24px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25);
  transition: border-color 220ms var(--ff-ease), transform 220ms var(--ff-ease);
}

.ff-card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.ff-card__title {
  margin: 0;
  font-family: var(--ff-font-head);
  font-weight: 800;
  font-size: var(--ff-fs-3);
  letter-spacing: 0.01em;
}

.ff-card__body {
  font-size: var(--ff-fs-2);
  line-height: 1.72;
  color: var(--ff-ink-2);
}

/* ---------------- 按钮 ---------------- */

.ff-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: transparent;
  color: var(--ff-ink);
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-2);
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background 220ms var(--ff-ease), border-color 220ms var(--ff-ease),
              color 220ms var(--ff-ease), transform 220ms var(--ff-ease);
}

.ff-btn--primary {
  background: var(--ff-orange);
  border-color: var(--ff-orange);
  color: #05070F;
}

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

.ff-btn--ghost:hover { border-color: var(--ff-orange); color: var(--ff-orange); }

.ff-btn--quiet {
  border-color: transparent;
  padding-inline: 8px;
  color: var(--ff-ink-2);
}

.ff-btn--quiet:hover { color: var(--ff-orange); }

/* ---------------- 面包屑 ---------------- */

.ff-breadcrumb { padding-top: 18px; }

.ff-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-gray);
}

.ff-breadcrumb__item { display: flex; align-items: center; gap: 8px; }

.ff-breadcrumb__item + .ff-breadcrumb__item::before {
  content: "/";
  color: var(--ff-mist);
}

.ff-breadcrumb__link {
  color: var(--ff-ink-2);
  transition: color 200ms var(--ff-ease);
}

.ff-breadcrumb__link:hover { color: var(--ff-orange); }

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

/* ---------------- 图片容器基础规则 ---------------- */

.ff-media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background-color: var(--ff-board);
  background-image:
    repeating-linear-gradient(96deg, rgba(31, 53, 96, 0.55) 0 1px, transparent 1px 22px),
    radial-gradient(80% 60% at 72% 8%, rgba(255, 106, 30, 0.12), transparent 70%);
}

.ff-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ff-media__tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 5px 10px;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: rgba(4, 9, 26, 0.86);
  color: var(--ff-ink-2);
  font-family: var(--ff-font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.ff-media--wide { aspect-ratio: 16 / 10; }
.ff-media--banner { aspect-ratio: 16 / 9; }
.ff-media--strip { aspect-ratio: 16 / 7; }
.ff-media--tall { aspect-ratio: 3 / 4; }
.ff-media--portrait { aspect-ratio: 4 / 5; }
.ff-media--square { aspect-ratio: 1 / 1; }

@media (max-width: 700px) {
  .ff-media--tall { aspect-ratio: 4 / 5; }
  .ff-media--strip { aspect-ratio: 16 / 10; }
}

/* ---------------- 数据表 ---------------- */

.ff-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: var(--ff-screen);
  overscroll-behavior-x: contain;
}

.ff-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--ff-fs-2);
}

.ff-table caption {
  padding: 14px 16px 4px;
  text-align: left;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.1em;
  color: var(--ff-gray);
}

.ff-table th,
.ff-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--ff-line);
  text-align: left;
  vertical-align: baseline;
}

.ff-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--ff-screen);
  color: var(--ff-ink-2);
  font-family: var(--ff-font-data);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.ff-table tbody tr { transition: background 180ms var(--ff-ease); }
.ff-table tbody tr:hover { background: rgba(255, 106, 30, 0.07); }
.ff-table tbody tr:last-child th,
.ff-table tbody tr:last-child td { border-bottom: 0; }

.ff-num {
  text-align: right;
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

/* ---------------- 筛选 chip ---------------- */

.ff-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: rgba(19, 36, 68, 0.5);
  color: var(--ff-ink-2);
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 200ms var(--ff-ease), color 200ms var(--ff-ease),
              background 200ms var(--ff-ease);
}

.ff-chip:hover { border-color: var(--ff-mist); color: var(--ff-ink); }

.ff-chip[aria-pressed="true"] {
  border-color: var(--ff-orange);
  background: var(--ff-board);
  color: var(--ff-orange);
}

/* ---------------- 下划线标签页 ---------------- */

.ff-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(14px, 3vw, 32px);
  margin-bottom: 24px;
  border-bottom: 1px solid var(--ff-line);
}

.ff-tab {
  appearance: none;
  margin-bottom: -1px;
  padding: 0 0 12px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--ff-gray);
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: color 200ms var(--ff-ease), border-color 200ms var(--ff-ease);
}

.ff-tab:hover { color: var(--ff-ink); }

.ff-tab[aria-selected="true"] {
  color: var(--ff-ink);
  border-bottom-color: var(--ff-orange);
}

/* ---------------- 折叠面板 ---------------- */

.ff-details { border-bottom: 1px solid var(--ff-line); }

.ff-details__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-3);
  color: var(--ff-ink);
  transition: color 200ms var(--ff-ease);
}

.ff-details__summary::-webkit-details-marker { display: none; }
.ff-details__summary:hover { color: var(--ff-orange); }

.ff-details__num {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  font-size: var(--ff-fs-1);
  letter-spacing: 0.1em;
  color: var(--ff-gray);
  transition: color 200ms var(--ff-ease);
}

.ff-details[open] .ff-details__num { color: var(--ff-orange); }

.ff-details__body {
  padding: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ff-ink-2);
}

@media (min-width: 700px) {
  .ff-details__body { padding-left: 32px; max-width: 68em; }
}

/* ---------------- 跳转链接 ---------------- */

.ff-skip {
  position: fixed;
  top: -80px;
  left: 14px;
  z-index: 90;
  padding: 12px 18px;
  border-radius: var(--ff-radius);
  background: var(--ff-orange);
  color: #05070F;
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-2);
  transition: top 200ms var(--ff-ease);
}

.ff-skip:focus { top: 14px; }

/* ---------------- 头部 ---------------- */

.ff-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 70;
  pointer-events: none;
}

.ff-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--ff-orange), var(--ff-green));
  will-change: transform;
}

.ff-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 60;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--ff-t) var(--ff-ease),
              border-color var(--ff-t) var(--ff-ease);
}

.ff-header[data-scrolled="true"] {
  background: #04091A;
  border-bottom-color: var(--ff-line);
}

.ff-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  width: 100%;
  max-width: var(--ff-w);
  min-height: var(--ff-header-h);
  margin-inline: auto;
  padding-inline: var(--ff-gutter);
  transition: min-height var(--ff-t) var(--ff-ease);
}

.ff-header[data-scrolled="true"] .ff-header__inner { min-height: 66px; }

.ff-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

/* 品牌 */
.ff-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
}

.ff-brand__mark {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  background: var(--ff-orange);
  clip-path: polygon(0 0, 100% 0, 74% 100%, 0 100%);
}

.ff-brand__mark::before,
.ff-brand__mark::after {
  content: "";
  position: absolute;
  left: 10px;
  width: 3px;
  background: var(--ff-night);
  transform: skewX(-14deg);
}

.ff-brand__mark::before { top: 6px; height: 8px; }
.ff-brand__mark::after { bottom: 6px; height: 8px; }

.ff-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.ff-brand__name {
  font-family: var(--ff-font-head);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--ff-ink);
}

.ff-brand__line {
  font-family: var(--ff-font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ff-ink-2);
}

/* 主导航 */
.ff-nav { margin-left: auto; }

.ff-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: navidx;
}

.ff-nav__item { counter-increment: navidx; }

.ff-nav__link {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px 2px 8px;
  color: var(--ff-ink-2);
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-2);
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 200ms var(--ff-ease);
}

.ff-nav__link::before {
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--ff-font-data);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--ff-mist);
  transition: color 200ms var(--ff-ease);
}

.ff-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--ff-orange);
  transition: right 260ms var(--ff-ease), background 200ms var(--ff-ease);
}

.ff-nav__link:hover { color: var(--ff-ink); }
.ff-nav__link:hover::before { color: var(--ff-orange-soft); }
.ff-nav__link:hover::after { right: 0; }

.ff-nav__link[aria-current="page"] { color: var(--ff-ink); }
.ff-nav__link[aria-current="page"]::before { color: var(--ff-orange); }
.ff-nav__link[aria-current="page"]::after { right: 0; background: var(--ff-green); }

.ff-nav__foot { display: none; }

.ff-nav__meta {
  margin: 0;
  font-family: var(--ff-font-data);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--ff-gray);
}

/* 行动按钮 */
.ff-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--ff-orange);
  border-radius: var(--ff-radius);
  background: transparent;
  color: var(--ff-orange);
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background 200ms var(--ff-ease), color 200ms var(--ff-ease),
              border-color 200ms var(--ff-ease);
}

.ff-cta::after {
  content: "";
  width: 6px;
  height: 6px;
  background: currentColor;
  transform: translateY(-1px);
}

.ff-cta:hover {
  background: var(--ff-orange);
  border-color: var(--ff-orange);
  color: #05070F;
}

/* 移动导航按钮 */
.ff-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--ff-line);
  border-radius: var(--ff-radius);
  background: var(--ff-board);
  color: var(--ff-ink);
  cursor: pointer;
}

.ff-nav-toggle__label {
  font-family: var(--ff-font-head);
  font-weight: 700;
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
}

.ff-nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.ff-nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--ff-orange);
  transition: transform 240ms var(--ff-ease), opacity 180ms var(--ff-ease);
}

.ff-nav-toggle[aria-expanded="true"] .ff-nav-toggle__bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.ff-nav-toggle[aria-expanded="true"] .ff-nav-toggle__bars i:nth-child(2) {
  opacity: 0;
}

.ff-nav-toggle[aria-expanded="true"] .ff-nav-toggle__bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 遮罩 */
.ff-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(2, 5, 14, 0.74);
  opacity: 0;
  pointer-events: none;
  transition: opacity 260ms var(--ff-ease);
}

.ff-scrim[data-visible="true"] { opacity: 1; pointer-events: auto; }

/* 移动端抽屉 */
@media (max-width: 900px) {
  .ff-nav-toggle { display: inline-flex; }

  .ff-header__actions .ff-cta { display: none; }

  .ff-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    z-index: 58;
    display: flex;
    flex-direction: column;
    width: min(340px, 88vw);
    margin: 0;
    padding: calc(var(--ff-header-h) + 20px) 24px 32px;
    background: var(--ff-screen);
    border-left: 1px solid var(--ff-line);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(102%);
    transition: transform 300ms var(--ff-ease);
  }

  .ff-nav[data-open="true"] { transform: translateX(0); }

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

  .ff-nav__item { border-bottom: 1px solid var(--ff-line); }

  .ff-nav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding: 15px 2px;
    font-size: 17px;
  }

  .ff-nav__link::after { display: none; }

  .ff-nav__foot {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 24px;
  }

  .ff-nav__foot .ff-cta { justify-content: center; }
}

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

.ff-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  background: var(--ff-screen);
  border-top: 1px solid var(--ff-line);
}

.ff-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: var(--ff-gutter);
  width: min(280px, 36%);
  height: 2px;
  background: var(--ff-orange);
}

.ff-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  width: 100%;
  max-width: var(--ff-w);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 84px) var(--ff-gutter) clamp(28px, 4vw, 48px);
}

@media (min-width: 900px) {
  .ff-footer__inner { grid-template-columns: minmax(240px, 1.05fr) 2fr; }
}

.ff-footer__lead { display: flex; flex-direction: column; }

.ff-footer__summary {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: var(--ff-fs-2);
  line-height: 1.8;
  color: var(--ff-ink-2);
}

.ff-footer__meta {
  margin: 18px 0 0;
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.08em;
  color: var(--ff-gray);
}

.ff-footer__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
}

@media (min-width: 620px) {
  .ff-footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.ff-footer__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--ff-font-data);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ff-ink-2);
}

.ff-footer__title::before {
  content: "";
  width: 14px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--ff-orange);
}

.ff-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ff-footer__list--contact { gap: 12px; }

.ff-footer__link {
  display: inline-block;
  color: var(--ff-ink);
  font-size: var(--ff-fs-2);
  line-height: 1.6;
  word-break: break-word;
  border-bottom: 1px solid transparent;
  transition: color 200ms var(--ff-ease), border-color 200ms var(--ff-ease);
}

.ff-footer__link:hover {
  color: var(--ff-orange);
  border-bottom-color: var(--ff-orange);
}

.ff-footer__link--data {
  font-family: var(--ff-font-data);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ff-ink-2);
}

.ff-footer__hint {
  margin: 14px 0 0;
  font-size: var(--ff-fs-1);
  line-height: 1.7;
  color: var(--ff-gray);
}

.ff-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 26px;
  width: 100%;
  max-width: var(--ff-w);
  margin-inline: auto;
  padding: 20px var(--ff-gutter) 30px;
  border-top: 1px solid var(--ff-line);
}

.ff-footer__legal {
  margin: 0;
  font-size: var(--ff-fs-1);
  line-height: 1.7;
  color: var(--ff-ink-2);
}

.ff-footer__facts {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
}

.ff-footer__icp,
.ff-footer__copy {
  font-family: var(--ff-font-data);
  font-size: var(--ff-fs-1);
  letter-spacing: 0.06em;
  color: var(--ff-gray);
}

/* ---------------- 动效 ---------------- */

html.ff-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 460ms var(--ff-ease), transform 460ms var(--ff-ease);
}

html.ff-js [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

[data-chapter-link][data-active="true"] {
  color: var(--ff-orange);
}

@media (max-width: 560px) {
  .ff-brand__name { font-size: 18px; }
  .ff-brand__line { font-size: 10px; letter-spacing: 0.1em; }
  .ff-chapter__note { width: 100%; margin-left: 0; }
  .ff-footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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