/* ==========================================================================
   浩瀚体育安装 — /assets/site.css
   0. 重置  1. 变量  2. 基础排版  3. 头部  4. 页脚与固定工具坞
   5. 通用组件  6. 响应式  7. 无障碍与动效降级
   ========================================================================== */

/* ---------- 0. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
}

body,
h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* ---------- 1. 变量 ---------- */
:root {
  /* 色彩体系 */
  --space: #0B1B2B;
  --night: #122A40;
  --paper: #F4EBDD;
  --paper-2: #FBF4E8;
  --ink: #1E1714;
  --ink-soft: #4A3B33;
  --ink-mute: #6B5B4D;
  --orange: #FF5A1F;
  --cyan: #38E1D6;
  --cyan-white: #E6FFFB;
  --cyan-deep: #0F6F68;
  --mist: #9DB2C4;
  --amber: #FFC24B;
  --brick: #C63A1E;

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: var(--font-display);
  --font-num: "DIN Alternate", "Oswald", "Bahnschrift", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;

  /* 字号 */
  --fs-h1: clamp(2.8rem, 7vw, 6.5rem);
  --fs-h2: clamp(1.8rem, 3.5vw, 3.2rem);
  --fs-h3: 1.35rem;
  --fs-body: 1.05rem;
  --fs-note: 0.85rem;
  --fs-step: clamp(4rem, 10vw, 8rem);

  /* 间距与尺寸 */
  --gap: clamp(1rem, 2vw, 1.75rem);
  --pad-x: clamp(1rem, 4vw, 2.5rem);
  --pad-y: clamp(3rem, 6vw, 6rem);
  --maxw: 1240px;
  --dock-h: 3.6rem;
  --r-card: 18px 6px 18px 6px;
  --shadow-lift: 0 18px 40px -28px rgba(11, 27, 43, 0.68);
}

/* ---------- 2. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: 1.45; letter-spacing: 0; }

p { text-wrap: pretty; }

:focus-visible {
  outline: 2.5px solid var(--brick);
  outline-offset: 3px;
  border-radius: 3px;
}

.site-header :focus-visible,
.site-footer :focus-visible,
.tool-dock :focus-visible,
.section--night :focus-visible {
  outline-color: var(--amber);
}

.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;
}

/* ---------- 3. 头部 ---------- */
.skip-link {
  position: absolute;
  top: 0.4rem;
  left: 1rem;
  z-index: 200;
  transform: translateY(-180%);
  padding: 0.6rem 1.05rem;
  border-radius: 6px;
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform 0.18s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--space);
  color: var(--cyan-white);
  isolation: isolate;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(56, 225, 214, 0.55) 0 1px,
    transparent 1px 18px
  );
  opacity: 0.6;
  pointer-events: none;
}

/* 上层：品牌说明带 */
.topbar {
  position: relative;
  padding-top: 6px;
  background: var(--space);
  border-bottom: 1px solid rgba(157, 178, 196, 0.18);
}

.topbar__inner {
  width: min(var(--maxw), 100%);
  margin-inline: auto;
  padding: 0.42rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.79rem;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.topbar__brandline {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--paper);
  font-weight: 600;
  white-space: nowrap;
}

.topbar__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.22);
  flex: 0 0 auto;
}

.topbar__meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.topbar__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding-left: 1.25rem;
  border-left: 1px solid rgba(157, 178, 196, 0.24);
  line-height: 1.5;
}

.topbar__item:first-child {
  padding-left: 0;
  border-left: 0;
}

.topbar__label {
  color: var(--cyan);
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.topbar__link {
  color: var(--paper);
  border-bottom: 1px solid rgba(56, 225, 214, 0.45);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

/* 下层：栏目带 */
.navbar {
  background: var(--night);
  border-bottom: 1px solid rgba(157, 178, 196, 0.16);
}

.navbar__inner {
  position: relative;
  width: min(var(--maxw), 100%);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  padding-block: 0.6rem;
}

.brand__mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1.5px solid rgba(56, 225, 214, 0.85);
  border-radius: 50%;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.brand__mark::before {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  top: 50%;
  height: 1.5px;
  background: var(--orange);
  transform: translateY(-50%);
}

.brand__mark::after {
  content: "";
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 50%;
  width: 1.5px;
  background: var(--cyan);
  transform: translateX(-50%);
}

.brand:hover .brand__mark {
  transform: rotate(90deg);
  border-color: var(--orange);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.brand__sub {
  font-family: var(--font-num);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.4vw, 1.5rem);
  margin-left: auto;
  flex: 1 1 auto;
  justify-content: flex-end;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.15rem, 0.9vw, 0.85rem);
  flex-wrap: wrap;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.5rem;
  border-radius: 5px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #CBD9E5;
  transition: color 0.18s ease, background-color 0.18s ease;
}

.nav__link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: transparent;
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
  flex: 0 0 auto;
}

.nav__link:hover {
  color: var(--cyan-white);
  background: rgba(56, 225, 214, 0.09);
}

.nav__link:hover::before {
  background: rgba(56, 225, 214, 0.7);
}

.nav__link[aria-current="page"] {
  color: var(--paper);
  font-weight: 700;
}

.nav__link[aria-current="page"]::before {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, 0.24);
}

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  bottom: 0.16rem;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 90, 31, 0));
}

.nav__cta {
  flex: 0 0 auto;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.5rem 0.75rem;
  border: 1px solid rgba(157, 178, 196, 0.45);
  border-radius: 6px;
  color: var(--paper);
  background: rgba(11, 27, 43, 0.65);
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

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

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.22s ease, opacity 0.18s ease;
}

.nav-toggle__text {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  transition: width 0.12s linear;
}

/* ---------- 4. 页脚与固定工具坞 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: #C7D7E3;
  border-top: 4px solid var(--orange);
  padding-bottom: calc(var(--dock-h) + 1.5rem);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(157, 178, 196, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(157, 178, 196, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
}

.footer__main {
  position: relative;
  z-index: 1;
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2.5rem);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.7rem;
}

.footer__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.footer__line {
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer__note {
  max-width: 30ch;
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--mist);
}

.footer__coltitle {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.9rem;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--paper);
}

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

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer__link {
  display: inline-block;
  font-size: 0.94rem;
  color: #C7D7E3;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer__link:hover {
  color: var(--cyan);
  border-bottom-color: rgba(56, 225, 214, 0.55);
}

.footer__base {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(157, 178, 196, 0.2);
  padding-block: clamp(1.5rem, 3vw, 2rem);
}

.footer__baseinner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.footer__contacts {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--mist);
}

.footer__contact {
  display: flex;
  gap: 0.6rem;
}

.footer__contactkey {
  flex: 0 0 auto;
  min-width: 2.6rem;
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 0.15rem;
}

.footer__legal {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: var(--fs-note);
  color: var(--mist);
}

.footer__legallist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
}

.footer__icp {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer__copy {
  font-size: 0.78rem;
  color: var(--mist);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(56, 225, 214, 0.45);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cyan);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.copy-btn:hover {
  background: rgba(56, 225, 214, 0.14);
  border-color: var(--cyan);
  color: var(--cyan-white);
}

.copy-toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--dock-h) + 1.1rem);
  z-index: 120;
  transform: translate(-50%, 14px);
  padding: 0.5rem 1.1rem;
  border-radius: 999px;
  background: var(--amber);
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.copy-toast[data-visible] {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* 固定工具坞 */
.tool-dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  background: rgba(11, 27, 43, 0.96);
  border-top: 1px solid rgba(56, 225, 214, 0.32);
  backdrop-filter: blur(6px);
}

.tool-dock__inner {
  width: min(var(--maxw), 100%);
  margin-inline: auto;
  min-height: var(--dock-h);
  padding: 0.35rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.tool-dock__link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.2rem;
  color: var(--paper);
  font-size: 0.88rem;
  font-weight: 600;
}

.tool-dock__coord {
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  padding: 0.12rem 0.45rem;
  border-radius: 4px;
  background: var(--orange);
  color: var(--ink);
}

.tool-dock__arrow {
  color: var(--cyan);
  transition: transform 0.2s ease;
}

.tool-dock__link:hover .tool-dock__arrow {
  transform: translateX(4px);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.85rem;
  border: 1px solid rgba(56, 225, 214, 0.5);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--cyan-white);
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.to-top:hover {
  background: rgba(56, 225, 214, 0.15);
  border-color: var(--cyan);
}

.to-top__icon {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 7px solid var(--cyan);
}

.to-top[hidden] {
  display: none;
}

/* ---------- 5. 通用组件 ---------- */
.container {
  width: min(var(--maxw), 100%);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section {
  padding-block: var(--pad-y);
}

.section--tight {
  padding-block: clamp(2rem, 3.5vw, 3.5rem);
}

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

.section--night {
  background: var(--space);
  color: var(--cyan-white);
}

.section--night .section-head__note,
.section--night .note {
  color: var(--mist);
}

.section--night .eyebrow {
  color: var(--amber);
}

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: var(--gap);
  align-items: end;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.section-head__title {
  font-size: var(--fs-h2);
  line-height: 1.15;
}

.section-head__note {
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--ink-mute);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: currentColor;
  flex: 0 0 auto;
}

.coord {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  padding: 0.14rem 0.45rem;
  border: 1px solid currentColor;
  border-radius: 4px;
  color: var(--orange);
  line-height: 1.6;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: var(--amber);
  color: var(--ink);
  line-height: 1.7;
}

.tag--cyan {
  background: var(--cyan);
  color: var(--ink);
}

.tag--brick {
  background: var(--brick);
  color: var(--paper);
}

.tag--line {
  background: transparent;
  border: 1px solid currentColor;
  color: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.2rem;
  border: 1.5px solid transparent;
  border-radius: 6px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--orange);
  color: var(--ink);
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn--cta {
  background: var(--orange);
  color: var(--ink);
  box-shadow: 0 6px 0 -2px rgba(255, 90, 31, 0.28);
}

.btn--cta:hover {
  background: #FF6F3C;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(56, 225, 214, 0.55);
  color: var(--cyan-white);
}

.btn--ghost:hover {
  background: rgba(56, 225, 214, 0.14);
  border-color: var(--cyan);
}

.btn--line {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

.btn--line:hover {
  background: var(--ink);
  color: var(--paper);
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1rem, 2vw, 1.5rem);
  border: 1px solid rgba(30, 23, 20, 0.14);
  border-radius: var(--r-card);
  background: var(--paper-2);
  color: var(--ink);
  box-shadow: var(--shadow-lift);
}

.card__title {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.45;
}

.card__meta {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--ink-mute);
}

.card__body {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.figure {
  margin: 0;
}

.figure__media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid rgba(56, 225, 214, 0.28);
  border-radius: var(--r-card);
  background-color: var(--night);
  background-image:
    linear-gradient(rgba(56, 225, 214, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 225, 214, 0.13) 1px, transparent 1px);
  background-size: 32px 32px;
}

.figure__media--wide {
  aspect-ratio: 21 / 9;
}

.figure__media--tall {
  aspect-ratio: 3 / 4;
}

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

.figure__cap {
  margin-top: 0.6rem;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--ink-mute);
}

.figure__cap .coord {
  margin-right: 0.5rem;
  color: var(--brick);
}

.prose {
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.9;
  color: var(--ink);
}

.prose > * + * {
  margin-top: 1.05em;
}

.prose h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  margin-top: 1.8em;
  padding-top: 0.6em;
  border-top: 1px solid rgba(30, 23, 20, 0.16);
}

.prose h3 {
  margin-top: 1.5em;
  color: var(--ink);
}

.prose ul li {
  position: relative;
  padding-left: 1.4rem;
}

.prose ul li + li {
  margin-top: 0.4em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--orange);
  border-radius: 1px;
  transform: rotate(45deg);
}

.prose a {
  color: var(--cyan-deep);
  border-bottom: 1px solid rgba(15, 111, 104, 0.45);
}

.prose a:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.section--night .prose,
.section--night .prose h2,
.section--night .prose h3 {
  color: var(--cyan-white);
}

.section--night .prose h2 {
  border-top-color: rgba(157, 178, 196, 0.28);
}

.note {
  padding-left: 0.9rem;
  border-left: 2px solid var(--orange);
  font-size: var(--fs-note);
  line-height: 1.8;
  color: var(--ink-mute);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--ink-mute);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

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

.breadcrumbs__link {
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.breadcrumbs__link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.breadcrumbs__current {
  color: var(--ink);
  font-weight: 600;
}

.slant {
  display: block;
  height: clamp(40px, 7vw, 88px);
  margin-block: -1px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: calc(var(--i, 0) * 60ms);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 6. 响应式 ---------- */
@media (max-width: 1080px) {
  .topbar__item:nth-child(2) {
    display: none;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer__brand {
    grid-column: span 2;
  }
}

@media (max-width: 980px) {
  .col-3,
  .col-4 {
    grid-column: span 6;
  }

  .col-7,
  .col-8,
  .col-5 {
    grid-column: span 12;
  }
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: 92px;
  }

  .topbar__meta {
    display: none;
  }

  .topbar__inner {
    justify-content: flex-start;
    padding-block: 0.35rem;
  }

  .navbar__inner {
    min-height: 60px;
    gap: 0.75rem;
  }

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

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 5;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin-left: 0;
    padding: 0.5rem var(--pad-x) 1.25rem;
    max-height: 74vh;
    overflow-y: auto;
    background: var(--space);
    border-top: 1px solid rgba(56, 225, 214, 0.28);
    border-bottom: 3px solid var(--orange);
    box-shadow: 0 26px 44px -26px rgba(0, 0, 0, 0.8);
  }

  .site-header[data-open] .nav {
    display: flex;
  }

  .site-header[data-open] .nav-toggle {
    border-color: var(--orange);
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(1) {
    transform: translateY(5px) rotate(45deg);
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(2) {
    opacity: 0;
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(3) {
    transform: translateY(-5px) rotate(-45deg);
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: navidx;
  }

  .nav__item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border-bottom: 1px dashed rgba(157, 178, 196, 0.22);
    counter-increment: navidx;
  }

  .nav__item::before {
    content: counter(navidx, decimal-leading-zero);
    font-family: var(--font-num);
    font-size: 0.74rem;
    letter-spacing: 0.12em;
    color: var(--cyan);
    min-width: 1.9rem;
  }

  .nav__link {
    width: 100%;
    padding: 0.9rem 0.25rem;
    font-size: 1.02rem;
    border-radius: 0;
  }

  .nav__link::after {
    display: none;
  }

  .nav__link[aria-current="page"]::before {
    background: var(--orange);
  }

  .nav__cta {
    display: flex;
    width: 100%;
    margin-top: 1rem;
    padding: 0.85rem 1rem;
  }

  .section-head {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 640px) {
  :root {
    --fs-body: 1rem;
    --dock-h: 3.4rem;
  }

  .col-3,
  .col-4,
  .col-5,
  .col-6 {
    grid-column: span 12;
  }

  .brand__sub {
    display: none;
  }

  .footer__grid {
    grid-template-columns: 1fr;
  }

  .footer__brand {
    grid-column: span 1;
  }

  .footer__baseinner {
    flex-direction: column;
  }

  .tool-dock__label {
    font-size: 0.82rem;
  }

  .to-top__text {
    display: none;
  }

  .to-top {
    padding: 0.34rem 0.6rem;
  }
}

/* ---------- 7. 动效降级 ---------- */
@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .brand:hover .brand__mark,
  .tool-dock__link:hover .tool-dock__arrow {
    transform: none;
  }
}