/* ============================================================
   MELBET 手机版 · 全站共享样式 / assets/site.css
   坐标执掌：网格、刻度、斜向引线、夜间航图
   ============================================================ */

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

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

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

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

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

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

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

table { border-collapse: collapse; width: 100%; }

:where(hr) { border: 0; border-top: 1px solid var(--border); }

/* ---------- 变量：夜间为默认 ---------- */
:root {
  color-scheme: dark;

  --ink: #0B0F14;
  --navy: #131C2B;
  --line: #2A3A52;
  --signal: #FFD200;
  --jade: #28C7A8;
  --amber: #F2A03D;
  --paper: #E9EDF2;
  --frost: #F5F7FA;
  --muted: #8E9AAB;

  --bg: #0B0F14;
  --bg-2: #131C2B;
  --bg-3: #1A2436;
  --text: #F5F7FA;
  --text-dim: #8E9AAB;
  --border: #2A3A52;
  --grid-line: rgba(42, 58, 82, 0.55);
  --wash: rgba(255, 255, 255, 0.045);
  --accent-fg: #28C7A8;
  --signal-ink: #0B0F14;
  --shadow-panel: 0 0 0 1px rgba(255, 210, 0, 0);

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --w: 1240px;
  --gutter: 1.25rem;
  --radius: 0px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

@media (min-width: 1024px) {
  :root { --gutter: 2rem; }
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #E9EDF2;
    --bg-2: #F5F7FA;
    --bg-3: #FFFFFF;
    --text: #0B0F14;
    --text-dim: #5A6675;
    --border: #C3CCD8;
    --grid-line: rgba(11, 15, 20, 0.07);
    --wash: rgba(11, 15, 20, 0.045);
    --accent-fg: #0E7A66;
  }
}

/* ---------- 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  background-color: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
  overflow-x: hidden;
}

@media (min-width: 1024px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 5.4vw, 3.75rem); }
h2 { font-size: clamp(1.4rem, 3.2vw, 2.1rem); }
h3 { font-size: clamp(1.05rem, 2vw, 1.3rem); }
h4 { font-size: 1rem; letter-spacing: -0.01em; }

p { text-wrap: pretty; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: -0.01em;
}

::selection {
  background: var(--signal);
  color: var(--signal-ink);
}

#main-content { scroll-margin-top: 6rem; }

/* ---------- 焦点可见 ---------- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* ---------- 容器 ---------- */
.container {
  width: min(100% - (var(--gutter) * 2), var(--w));
  margin-inline: auto;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -6rem;
  left: var(--gutter);
  z-index: 300;
  padding: 0.7rem 1.15rem;
  background: var(--signal);
  color: var(--signal-ink);
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: top 0.22s var(--ease);
}
.skip-link:focus {
  top: 0.9rem;
}

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--signal);
  box-shadow: 0 0 10px rgba(255, 210, 0, 0.6);
  z-index: 220;
  pointer-events: none;
}

/* --- 上层条 --- */
.header-strip {
  background-color: var(--bg);
}

.header-strip__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-height: 62px;
  padding-block: 0.6rem;
}

/* --- 品牌 --- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
  min-width: 0;
}

.brand__mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--signal);
  color: var(--signal-ink);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.04em;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.16;
  min-width: 0;
}

.brand__name {
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__sub {
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  white-space: nowrap;
}

.brand--footer .brand__mark {
  width: 30px;
  height: 30px;
  font-size: 0.9rem;
}

/* --- 版本刻度 --- */
.version-dial {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-inline-start: auto;
  padding: 0.32rem 0.7rem;
  border: 1px solid var(--border);
  border-left: 2px solid var(--signal);
  background: var(--bg-2);
}

.version-dial__label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
  text-transform: uppercase;
  white-space: nowrap;
}

.version-dial__num {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.5vw, 1.15rem);
  font-weight: 700;
  color: var(--signal);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.version-dial__tick {
  width: 2.4rem;
  height: 8px;
  background-image: repeating-linear-gradient(
    to right,
    var(--border) 0 1px,
    transparent 1px 7px
  );
}

/* --- 工具区 --- */
.header-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.tool-btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
  font-weight: 700;
}
.tool-btn--signal:hover { background: #FFE04D; }

.tool-btn--ghost:hover {
  border-color: var(--jade);
  color: var(--jade);
}

/* --- 提示浮层 --- */
.header-hint {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  z-index: 97;
  padding: 0.5rem 0.85rem;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--jade);
  color: var(--text);
  font-size: 0.78rem;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
    visibility 0.2s var(--ease);
}
.header-hint[data-active="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* --- 移动开关 --- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  position: relative;
  z-index: 96;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background 0.22s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease), top 0.24s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open="true"] .nav-toggle__bars { background: transparent; }
.site-header[data-open="true"] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}
.site-header[data-open="true"] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* --- 下层导航 --- */
.header-nav-bar {
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
}

.nav-inner {
  position: relative;
  display: flex;
  align-items: center;
}

.primary-nav { width: 100%; }

.primary-nav__list {
  display: flex;
  align-items: stretch;
}

.primary-nav__item { flex: 0 0 auto; }

.primary-nav__link {
  display: block;
  padding: 0.88rem 1.15rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dim);
  letter-spacing: 0.01em;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), background 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.primary-nav__item:first-child .primary-nav__link {
  padding-inline-start: 0;
}

.primary-nav__link:hover {
  color: var(--text);
  background: var(--wash);
}

.primary-nav__link[aria-current="page"] {
  color: var(--signal);
  border-bottom-color: var(--signal);
  font-weight: 600;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-block-start: clamp(3rem, 8vw, 6rem);
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: -1px 0 auto 0;
  height: 3px;
  background: linear-gradient(
    to right,
    var(--signal) 0,
    var(--signal) 120px,
    var(--border) 120px,
    var(--border) 240px,
    transparent 240px
  );
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-block: clamp(2.25rem, 6vw, 3.75rem);
}

.footer-col { min-width: 0; }
.footer-col--brand { max-width: 34ch; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-block-end: 1rem;
}

.footer-desc {
  margin-block-start: 1rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.footer-icp {
  margin-block-start: 1rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}

.footer-links {
  display: grid;
  gap: 0.5rem;
}

.footer-links__item { min-width: 0; }

.footer-links a {
  font-size: 0.87rem;
  color: var(--text-dim);
  transition: color 0.18s var(--ease);
}
.footer-links a:hover { color: var(--text); }

.footer-links .footer-link--lead {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 600;
}
.footer-links .footer-link--lead::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: var(--signal);
}
.footer-links .footer-link--lead:hover { color: var(--signal); }

.footer-contact { display: grid; gap: 0.8rem; }
.footer-contact__row { display: grid; gap: 0.1rem; }

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.footer-contact__val {
  font-size: 0.87rem;
  color: var(--text);
  overflow-wrap: anywhere;
}

.footer-note {
  margin-block-start: 1rem;
  font-size: 0.76rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 1.2rem 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.02em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.15rem;
}
.footer-legal a {
  color: var(--text-dim);
  transition: color 0.18s var(--ease);
}
.footer-legal a:hover { color: var(--signal); }

/* --- 回到顶部 --- */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 80;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  font-size: 1rem;
  line-height: 1;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
    visibility 0.24s var(--ease), border-color 0.2s var(--ease),
    color 0.2s var(--ease);
}
.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover {
  border-color: var(--signal);
  color: var(--signal);
}

/* ============================================================
   通用组件
   ============================================================ */

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.78rem 1.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
  font-weight: 700;
}
.btn--signal:hover { background: #FFE04D; }
.btn--ghost:hover { border-color: var(--signal); color: var(--signal); }
.btn--jade { border-color: var(--jade); color: var(--jade); }
.btn--jade:hover { background: rgba(40, 199, 168, 0.12); }

/* --- 面包屑 --- */
.breadcrumb { margin-block: 1.25rem 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

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

.breadcrumb__link {
  color: var(--text-dim);
  transition: color 0.18s var(--ease);
}
.breadcrumb__link:hover { color: var(--signal); }

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

/* --- 正文容器 --- */
.prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text);
}

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

.prose h2 {
  margin-block-start: 2em;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
}
.prose h3 {
  margin-block-start: 1.7em;
  font-size: 1.08rem;
}

.prose a {
  color: var(--accent-fg);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose ul { list-style: disc; padding-inline-start: 1.25em; }
.prose ol { list-style: decimal; padding-inline-start: 1.4em; }
.prose li + li { margin-block-start: 0.45em; }

.prose blockquote {
  padding-inline-start: 1rem;
  border-inline-start: 2px solid var(--signal);
  color: var(--text-dim);
}

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

/* --- 网格 --- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.75rem);
}
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--asym { grid-template-columns: 1fr; }

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 960px) {
  .grid--asym { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }
}

/* --- 面板 --- */
.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  background: var(--bg-2);
  border: 1px solid var(--border);
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-block-end: 0.85rem;
}

.panel__title {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.panel__body {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.75;
}
.panel__body > * + * { margin-block-start: 0.8em; }

/* --- 标签 --- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.tag--jade { border-color: var(--jade); color: var(--jade); }
.tag--amber { border-color: var(--amber); color: var(--amber); }

/* --- 图片容器 --- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  background-color: var(--bg-2);
  background-image: linear-gradient(
    135deg,
    rgba(40, 199, 168, 0.12),
    transparent 58%
  );
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 34px 34px;
}

.media-frame img,
.media-frame video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  margin-block-start: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

/* --- 区块标题 --- */
.section-head {
  display: grid;
  gap: 0.55rem;
  margin-block-end: clamp(1.4rem, 3vw, 2.2rem);
}

.section-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal);
}
.section-head__eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--signal);
}

.section-head__title {
  font-size: clamp(1.45rem, 3.4vw, 2.05rem);
  letter-spacing: -0.02em;
}

.section-head__desc {
  max-width: 62ch;
  font-size: 0.94rem;
  color: var(--text-dim);
}

/* --- 斜向分隔带 --- */
.diagonal-band {
  height: 1px;
  margin-block: clamp(2rem, 6vw, 3.5rem);
  background: linear-gradient(
    to right,
    transparent,
    var(--border) 10%,
    var(--border) 90%,
    transparent
  );
  transform: rotate(-1.2deg);
  transform-origin: center;
}

/* --- 显现动效协议 --- */
.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.has-js .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ============================================================
   响应式：移动坐标抽屉
   ============================================================ */
@media (max-width: 1080px) {
  .tool-btn--ghost { display: none; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .header-nav-bar { border-top: 0; }
  .nav-inner { min-height: 1px; }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    width: min(84vw, 340px);
    padding: 5.75rem 1.15rem 2rem;
    overflow-y: auto;
    background: var(--bg-2);
    border-left: 1px solid var(--border);
    transform: translateX(101%);
    visibility: hidden;
    box-shadow: -24px 0 60px rgba(0, 0, 0, 0.42);
    transition: transform 0.32s var(--ease), visibility 0.32s var(--ease);
  }

  .site-header[data-open="true"] .primary-nav {
    transform: translateX(0);
    visibility: visible;
  }

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

  .primary-nav__item { flex: 1 1 auto; }

  .primary-nav__link,
  .primary-nav__item:first-child .primary-nav__link {
    padding: 0.95rem 0.85rem;
    font-size: 0.98rem;
    border-bottom: 1px solid var(--border);
    border-left: 3px solid transparent;
  }

  .primary-nav__link:hover { background: var(--wash); }

  .primary-nav__link[aria-current="page"] {
    border-bottom-color: var(--border);
    border-left-color: var(--signal);
    background: var(--wash);
  }
}

@media (max-width: 720px) {
  .brand__sub { display: none; }
  .version-dial__label { display: none; }
  .tool-btn { padding: 0.46rem 0.72rem; font-size: 0.75rem; }
  .header-strip__inner { gap: 0.6rem; min-height: 56px; }
}

@media (max-width: 620px) {
  .brand__text { display: none; }
}

@media (max-width: 460px) {
  .version-dial__tick { display: none; }
  .version-dial { padding: 0.28rem 0.5rem; }
  .nav-toggle__text { display: none; }
}

/* ============================================================
   页脚列布局
   ============================================================ */
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.35fr 1fr 1fr 1.25fr;
    gap: 2.5rem;
  }
}

/* ============================================================
   降低动效偏好
   ============================================================ */
@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;
    scroll-behavior: auto !important;
  }

  .has-js .reveal {
    opacity: 1;
    transform: none;
  }
}