/* ==========================================================================
   鼎盛主站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 顶栏 / 页脚 / 通用组件 / 响应式
   ========================================================================== */

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

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

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

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

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

a { color: inherit; }

button, input, select, textarea { font: inherit; color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --amber-core: #A9720E;
  --amber-deep: #3E2A08;
  --amber-tint: #F2E3C2;
  --snow-qing: #7EA9B4;
  --ink-qing: #35606B;
  --sand: #E6D3AE;
  --neon: #17E6A1;
  --cyan-ink: #0A7A58;
  --ink: #171310;
  --paper: #FBF7EF;
  --line: #C9B99A;
  --line-soft: rgba(201, 185, 154, 0.55);
  --hair-dark: rgba(230, 211, 174, 0.24);

  --font-display: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', system-ui, sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-hero: clamp(2.6rem, 6.2vw, 5.4rem);
  --fs-section: clamp(1.8rem, 3.4vw, 2.8rem);
  --fs-body: clamp(0.95rem, 1.05vw, 1.05rem);

  --header-h: 78px;
  --shell: 1280px;
  --gutter: clamp(16px, 3vw, 40px);
  --gap: 24px;

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t: 200ms;
}

@media (max-width: 900px) {
  :root { --header-h: 64px; --gutter: 18px; }
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.012em;
  padding-top: var(--header-h);
  overflow-x: hidden;
}

body[data-hero] { padding-top: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--ink);
}

.display-1 {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.025em;
}

.display-2 {
  font-family: var(--font-display);
  font-size: var(--fs-section);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.prose { max-width: 62ch; }
.prose p { margin: 0 0 0.9em; }
.prose p:last-child { margin-bottom: 0; }

.u-mono {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.5em;
  line-height: 1.1;
}

.stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 1.5em;
  color: var(--cyan-ink);
  line-height: 1.1;
}

.num-block {
  display: inline-grid;
  place-items: center;
  min-width: 2.4em;
  padding: 0.4em 0.55em;
  background: var(--amber-deep);
  color: var(--neon);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  letter-spacing: 0.04em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--amber-core);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--ink-qing);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(23, 230, 161, 0.4);
}

.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--neon);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(23, 230, 161, 0.28);
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--amber-deep);
  color: var(--paper);
  border: 1px solid var(--neon);
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  transition: top var(--t) var(--ease);
}

.skip-link:focus { top: 12px; }

/* ---------- 5. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-main { display: block; min-height: 60vh; }

.grid-12 {
  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-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.split {
  display: grid;
  grid-template-columns: minmax(200px, 28%) minmax(0, 1fr);
  gap: clamp(18px, 2.5vw, 32px);
  align-items: start;
}

.split-aside {
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.stack > * + * { margin-top: clamp(20px, 3vw, 36px); }

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

.band {
  height: 12px;
  background: linear-gradient(100deg, var(--sand) 0%, var(--amber-tint) 52%, var(--sand) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* ---------- 6. 通用文本组件 ---------- */
.sec-head { max-width: 62ch; margin-bottom: clamp(16px, 2vw, 28px); }

.sec-title {
  font-family: var(--font-display);
  font-size: var(--fs-section);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  margin: 0 0 10px;
}

.sec-sub { font-size: 0.98rem; color: var(--ink-qing); max-width: 56ch; }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--ink-qing);
}

.crumbs li { display: flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--line); }
.crumbs a { text-decoration: none; border-bottom: 1px solid transparent; transition: border-color var(--t) var(--ease); }
.crumbs a:hover { border-bottom-color: var(--cyan-ink); }

.dark-surface { background: var(--amber-deep); color: var(--paper); }
.dark-surface .stat-num { color: var(--neon); }
.dark-surface .sec-title { color: var(--paper); }
.dark-surface .sec-sub { color: rgba(251, 247, 239, 0.78); }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  background: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--t) var(--ease),
              border-color var(--t) var(--ease),
              color var(--t) var(--ease);
}

.btn-solid {
  background: var(--amber-core);
  border-color: var(--amber-core);
  color: var(--ink);
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: var(--neon);
  border-color: var(--neon);
  color: var(--ink);
}

.btn-line {
  border-color: currentColor;
  background: transparent;
  color: inherit;
}

.btn-line:hover,
.btn-line:focus-visible {
  border-color: var(--neon);
  color: var(--neon);
}

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* ---------- 8. 顶栏 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  color: var(--paper);
  transition: background-color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--t) var(--ease);
  background: linear-gradient(180deg, rgba(23, 19, 16, 0.62), rgba(23, 19, 16, 0));
}

body[data-hero] .site-header:not(.is-solid):not([data-nav-open])::before { opacity: 1; }

.site-header.is-solid,
.site-header[data-nav-open],
body:not([data-hero]) .site-header {
  background: var(--amber-deep);
  border-bottom-color: var(--hair-dark);
}

.site-header.is-solid::before,
.site-header[data-nav-open]::before,
body:not([data-hero]) .site-header::before { opacity: 0; }

.header-rail {
  position: relative;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  flex: 0 0 auto;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--amber-core);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1;
  flex: 0 0 auto;
}

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

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--sand);
  opacity: 0.9;
  white-space: nowrap;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--hair-dark);
  color: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

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

.nav-toggle-bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform var(--t) var(--ease), top var(--t) var(--ease), bottom var(--t) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars::after { bottom: 4px; transform: rotate(-45deg); }

/* 步骤条导航 */
.site-nav { min-width: 0; overflow: hidden; }

.nav-steps {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0;
}

.nav-step { display: flex; }

.nav-step + .nav-step { border-left: 1px solid var(--hair-dark); }

.nav-step a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  text-decoration: none;
  color: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease);
}

.nav-step a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t) var(--ease);
}

.nav-step a:hover::after,
.nav-step a:focus-visible::after { transform: scaleX(1); }

.nav-step a:hover { background: rgba(23, 230, 161, 0.1); }

.nav-step a[aria-current="page"] {
  background: var(--amber-core);
  color: var(--ink);
  font-weight: 700;
}

.nav-step a[aria-current="page"]::after { display: none; }

.step-index {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--sand);
  opacity: 0.9;
}

.nav-step a[aria-current="page"] .step-index { color: var(--amber-deep); opacity: 1; }

.step-label { display: inline-block; }

/* 右侧速览 */
.header-aside {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.rate-chip {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 5px 10px;
  border: 1px solid rgba(23, 230, 161, 0.5);
  background: rgba(23, 230, 161, 0.08);
  line-height: 1.1;
}

.rate-chip-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--sand);
}

.rate-chip-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--neon);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 90ms linear;
}

/* ---------- 9. 面板与标签组件 ---------- */
.panel {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.4vw, 30px);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(169, 114, 14, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 114, 14, 0.06) 1px, transparent 1px);
  background-size: 8px 8px;
}

.panel > * { position: relative; z-index: 1; }

.panel:hover,
.panel:focus-within { border-color: var(--neon); }

.panel--shift { margin-inline-start: clamp(0px, 2vw, 24px); }

.panel-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--amber-core);
}

.panel-title {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0;
}

.panel-tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--ink-qing);
}

.panel-body { font-size: 0.96rem; }
.panel-body p + p { margin-top: 0.7em; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  background: var(--amber-tint);
  color: var(--amber-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.tag--qing {
  border-color: var(--snow-qing);
  background: rgba(126, 169, 180, 0.16);
  color: var(--ink-qing);
}

.tag--neon {
  border-color: var(--cyan-ink);
  background: rgba(23, 230, 161, 0.14);
  color: var(--cyan-ink);
}

.callout {
  border-left: 4px solid var(--amber-core);
  background: var(--amber-tint);
  padding: 16px 20px;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ---------- 10. 图片容器（页面阶段放本地实拍图） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--sand);
  border: 1px solid var(--line);
  overflow: hidden;
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-caption {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-qing);
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--amber-deep);
  color: var(--paper);
  border-top: 1px solid var(--hair-dark);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(230, 211, 174, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 211, 174, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
}

.footer-inner {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 64px) var(--gutter) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 0.9fr 1.35fr;
  gap: clamp(20px, 3vw, 44px);
  padding-bottom: clamp(28px, 4vw, 52px);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}

.footer-brand-sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--sand);
  margin: 0 0 14px;
}

.footer-note {
  margin: 0 0 18px;
  max-width: 34ch;
  font-size: 0.86rem;
  line-height: 1.7;
  color: rgba(251, 247, 239, 0.78);
}

.footer-links-cta { display: flex; flex-wrap: wrap; gap: 10px; }

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

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-list a {
  position: relative;
  display: inline-block;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--paper);
}

.footer-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t) var(--ease);
}

.footer-list a:hover::after,
.footer-list a:focus-visible::after { transform: scaleX(1); }

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

.copy-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.copy-value {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--paper);
  word-break: break-all;
}

.copy-btn {
  padding: 2px 8px;
  border: 1px solid var(--hair-dark);
  background: transparent;
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.copy-btn:hover,
.copy-btn:focus-visible { border-color: var(--neon); color: var(--neon); }

.copy-status {
  margin: 0 0 10px;
  min-height: 1.2em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--neon);
  opacity: 0;
  transition: opacity var(--t) var(--ease);
}

.copy-status[data-state="done"] { opacity: 1; }

.footer-addr {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(251, 247, 239, 0.72);
}

.footer-legal {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 26px;
  border-top: 1px solid var(--hair-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  justify-content: space-between;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(251, 247, 239, 0.7);
}

.footer-legal-icp { font-family: var(--font-mono); }
.footer-legal-year { font-family: var(--font-mono); }

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1200px) {
  .nav-step a { font-size: 0.84rem; padding: 8px 9px; }
  .nav-step a::after { left: 9px; right: 9px; }
  .step-index { font-size: 0.64rem; }
  .brand-name { font-size: 0.92rem; }
  .rate-chip-value { font-size: 0.94rem; }
}

@media (max-width: 1080px) {
  .rate-chip { display: none; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; row-gap: 32px; }
  .footer-contact { grid-column: span 3; }
}

@media (max-width: 1024px) {
  .col-3 { grid-column: span 6; }
  .col-4 { grid-column: span 6; }
  .col-8 { grid-column: span 12; }
  .col-9 { grid-column: span 12; }
}

@media (max-width: 900px) {
  .header-rail {
    grid-template-columns: 1fr auto;
    align-content: start;
    padding-block: 10px;
    gap: 10px;
  }

  .brand { grid-column: 1; }

  .nav-toggle { display: inline-flex; grid-column: 2; justify-self: end; }

  .header-aside { display: none; }

  .site-nav {
    grid-column: 1 / -1;
    display: none;
    width: 100%;
  }

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

  .nav-steps {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 6px;
    max-height: min(62vh, 430px);
    overflow-y: auto;
    padding-bottom: 10px;
  }

  .nav-step + .nav-step { border-left: 0; }

  .nav-step a {
    border: 1px solid var(--hair-dark);
    padding: 8px 11px;
    font-size: 0.86rem;
  }

  .nav-step a::after { display: none; }

  .nav-step a[aria-current="page"] { border-color: var(--amber-core); }

  .split { grid-template-columns: 1fr; }
  .split-aside { position: static; }

  .panel--shift { margin-inline-start: 0; }
}

@media (max-width: 640px) {
  .col-3, .col-4, .col-6, .col-8, .col-9 { grid-column: span 12; }

  .grid-12 { gap: 18px; }

  .display-1 { letter-spacing: -0.02em; }

  .footer-grid { grid-template-columns: 1fr; row-gap: 28px; }
  .footer-contact { grid-column: auto; }
  .footer-note { max-width: none; }

  .footer-legal { flex-direction: column; gap: 8px; }

  .panel { padding: 18px 16px; }
}

/* ---------- 13. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scroll-progress { transition: none; }
}