/* =========================================================
   28圈品牌站 · 共享样式 /assets/site.css
   轨道 · 圆环 · 三色环阶
   ========================================================= */

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--paper);
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

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

strong, b { font-weight: 800; }

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

/* ---------- tokens ---------- */
:root {
  --ink: #0B1B2B;
  --ink-deep: #07131F;
  --ink-soft: #13293D;
  --paper: #F4EFE6;
  --signal: #FF6A2B;
  --signal-deep: #C24A16;
  --celadon: #2EC4B6;
  --celadon-deep: #14655E;
  --slate: #3A4A5A;
  --stone: #8C9AA6;
  --moss: #6B8F71;
  --clay: #C97B5A;
  --focus: #FFD166;
  --white: #FFFFFF;

  --line: rgba(140, 154, 166, .34);
  --line-strong: rgba(58, 74, 90, .42);
  --line-dark: rgba(244, 239, 230, .16);

  --font-sans: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --radius: 18px;
  --radius-sm: 10px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 中文排版基线 ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(38px, 6.2vw, 76px);
  letter-spacing: -.03em;
  line-height: 1.08;
}

h2 { font-size: clamp(26px, 3.4vw, 44px); }
h3 { font-size: clamp(19px, 2.2vw, 26px); letter-spacing: -.01em; }
h4 { font-size: 17px; letter-spacing: 0; }

p { max-width: 74ch; }

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}

.c28-header :focus-visible,
.c28-footer :focus-visible {
  outline-color: var(--focus);
}

/* ---------- 跳转链接 ---------- */
.c28-skip {
  position: fixed;
  top: 10px;
  left: var(--gutter);
  z-index: 200;
  padding: 12px 20px;
  border-radius: 12px;
  background: var(--focus);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  transform: translateY(-220%);
  transition: transform .22s var(--ease);
}

.c28-skip:focus {
  transform: translateY(0);
}

/* ---------- 容器 ---------- */
.c28-shell {
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.c28-shell--narrow {
  width: min(760px, calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

/* =========================================================
   页头
   ========================================================= */
.c28-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--line-dark);
  box-shadow: 0 20px 40px -34px rgba(4, 10, 16, .9);
}

/* 顶部播报轨道 */
.c28-header__strip {
  background: var(--ink-deep);
  border-bottom: 1px solid rgba(140, 154, 166, .18);
  max-height: 44px;
  overflow: hidden;
  transition: max-height .3s var(--ease), opacity .24s var(--ease), border-color .24s var(--ease);
}

.c28-header[data-shrink="true"] .c28-header__strip {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.c28-header__strip-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 40px);
  min-height: 34px;
  padding-block: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--stone);
  white-space: nowrap;
}

.c28-strip__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.c28-strip__item--celadon { color: var(--celadon); }

.c28-strip__item--stone {
  margin-left: auto;
  color: var(--stone);
}

.c28-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, .18);
}

.c28-dot--celadon {
  background: var(--celadon);
  box-shadow: 0 0 0 3px rgba(46, 196, 182, .18);
}

/* 刊头 */
.c28-masthead {
  padding-block: clamp(11px, 1.7vw, 19px);
  transition: padding .3s var(--ease);
}

.c28-header[data-shrink="true"] .c28-masthead {
  padding-block: 8px;
}

.c28-masthead__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(14px, 3vw, 40px);
}

/* 品牌署名 */
.c28-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 6px 8px;
  margin-left: -8px;
  border-radius: 14px;
  transition: background .2s var(--ease);
}

.c28-brand:hover { background: rgba(46, 196, 182, .1); }

.c28-brand--footer {
  padding: 0;
  margin-left: 0;
}

.c28-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
}

.c28-brand__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(46, 196, 182, .55);
  transition: transform .4s var(--ease), border-color .3s var(--ease);
}

.c28-brand__ring--2 {
  inset: 8px;
  border: 1px dashed rgba(255, 106, 43, .62);
}

.c28-brand:hover .c28-brand__ring { border-color: var(--celadon); }
.c28-brand:hover .c28-brand__ring--2 { transform: rotate(45deg); }

.c28-brand__core {
  position: relative;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -.06em;
  color: var(--paper);
}

.c28-brand__text {
  display: grid;
  gap: 3px;
  line-height: 1;
}

.c28-brand__name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--paper);
}

.c28-brand__latin {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--stone);
}

/* 刊头中线 */
.c28-masthead__center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--stone);
  white-space: nowrap;
}

.c28-masthead__center-line {
  width: clamp(20px, 6vw, 96px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-dark), transparent);
}

/* 右侧入口 */
.c28-masthead__aside {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

/* ---------- 按钮族 ---------- */
.c28-cta {
  --cta-bg: transparent;
  --cta-fg: var(--paper);
  --cta-line: var(--line-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--cta-line);
  border-radius: 999px;
  background: var(--cta-bg);
  color: var(--cta-fg);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .02em;
  text-align: center;
  transition: transform .18s var(--ease), background-color .18s var(--ease),
              border-color .18s var(--ease), color .18s var(--ease);
}

.c28-cta:hover { transform: translateY(-2px); }

.c28-cta--signal {
  --cta-bg: var(--signal);
  --cta-fg: var(--ink);
  --cta-line: var(--signal);
}

.c28-cta--signal:hover { --cta-bg: #FF7F49; }

.c28-cta--ghost {
  --cta-fg: rgba(244, 239, 230, .88);
  --cta-line: rgba(244, 239, 230, .3);
}

.c28-cta--ghost:hover {
  --cta-fg: var(--ink);
  --cta-bg: var(--paper);
  --cta-line: var(--paper);
}

.c28-cta--celadon {
  --cta-bg: rgba(46, 196, 182, .12);
  --cta-fg: var(--celadon);
  --cta-line: rgba(46, 196, 182, .55);
}

.c28-cta--celadon:hover {
  --cta-bg: rgba(46, 196, 182, .22);
  --cta-fg: #7FE8DE;
}

.c28-cta--ink {
  --cta-bg: var(--ink);
  --cta-fg: var(--paper);
  --cta-line: var(--ink);
}

.c28-cta--ink:hover {
  --cta-bg: var(--ink-soft);
  --cta-line: var(--ink-soft);
}

.c28-cta--block { display: flex; width: 100%; }

/* ---------- 移动菜单按钮 ---------- */
.c28-navtoggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid rgba(244, 239, 230, .3);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--paper);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.c28-navtoggle:hover {
  border-color: var(--celadon);
  background: rgba(46, 196, 182, .12);
}

.c28-navtoggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.c28-navtoggle__bars span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .18s var(--ease);
}

.c28-navtoggle[aria-expanded="true"] .c28-navtoggle__bars span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.c28-navtoggle[aria-expanded="true"] .c28-navtoggle__bars span:nth-child(2) {
  opacity: 0;
}

.c28-navtoggle[aria-expanded="true"] .c28-navtoggle__bars span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ---------- 主栏目 ---------- */
.c28-nav {
  border-top: 1px solid rgba(140, 154, 166, .16);
  background: linear-gradient(180deg, rgba(11, 27, 43, 0), rgba(7, 19, 31, .6));
}

.c28-nav__list {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: clamp(2px, 1.4vw, 16px);
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.c28-nav__link {
  position: relative;
  display: grid;
  gap: 3px;
  padding: 12px clamp(8px, 1.4vw, 18px) 14px;
  border-radius: 10px 10px 0 0;
  text-align: center;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.c28-nav__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--signal);
  transform: translateX(-50%);
  transition: width .26s var(--ease);
}

.c28-nav__link:hover { background: rgba(244, 239, 230, .07); }
.c28-nav__link:hover::after { width: calc(100% - 16px); }

.c28-nav__cn {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.c28-nav__en {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
}

.c28-nav__link[aria-current="page"] {
  background: rgba(255, 106, 43, .1);
}

.c28-nav__link[aria-current="page"]::after {
  width: calc(100% - 16px);
}

.c28-nav__link[aria-current="page"] .c28-nav__cn { color: var(--signal); }
.c28-nav__link[aria-current="page"] .c28-nav__en { color: rgba(255, 106, 43, .82); }

/* ---------- 轨道进度线 ---------- */
.c28-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.c28-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--celadon), var(--signal));
}

/* =========================================================
   页脚
   ========================================================= */
.c28-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding-top: clamp(44px, 6vw, 80px);
  margin-top: clamp(40px, 7vw, 96px);
}

.c28-footer__orbit {
  position: absolute;
  top: -160px;
  right: -140px;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  border: 1px solid rgba(46, 196, 182, .16);
  pointer-events: none;
}

.c28-footer__orbit::before {
  content: "";
  position: absolute;
  inset: 68px;
  border-radius: 50%;
  border: 1px dashed rgba(255, 106, 43, .2);
}

.c28-footer__orbit::after {
  content: "";
  position: absolute;
  inset: 158px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(46, 196, 182, .16), transparent 68%);
}

.c28-footer__top {
  position: relative;
  display: grid;
  grid-template-columns: minmax(240px, .95fr) minmax(0, 1.65fr);
  gap: clamp(30px, 5vw, 68px);
  padding-bottom: clamp(30px, 4vw, 54px);
  border-bottom: 1px solid var(--line-dark);
}

.c28-footer__intro {
  display: grid;
  align-content: start;
  gap: 16px;
}

.c28-footer__tagline {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -.01em;
  color: var(--paper);
  max-width: 26ch;
}

.c28-footer__note {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(244, 239, 230, .62);
  max-width: 34ch;
  padding-left: 14px;
  border-left: 2px solid rgba(46, 196, 182, .5);
}

.c28-footer__intro .c28-cta { justify-self: start; }

.c28-footer__cols {
  display: grid;
  grid-template-columns: .85fr .85fr 1.3fr;
  gap: clamp(20px, 3vw, 42px);
}

.c28-footer__col {
  display: grid;
  align-content: start;
  gap: 12px;
}

.c28-footer__col-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  max-width: none;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--paper);
}

.c28-footer__col-title span {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal);
}

.c28-footer__list {
  display: grid;
  gap: 2px;
}

.c28-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(244, 239, 230, .76);
  transition: color .18s var(--ease);
}

.c28-footer__link::before {
  content: "";
  width: 0;
  height: 1px;
  background: var(--celadon);
  transition: width .22s var(--ease);
}

.c28-footer__link:hover { color: var(--paper); }
.c28-footer__link:hover::before { width: 14px; }

.c28-footer__contact {
  display: grid;
  gap: 2px;
}

.c28-contact-line {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(140, 154, 166, .2);
}

.c28-contact-line__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--celadon);
  padding-top: 3px;
}

.c28-contact-line__value {
  font-size: 13.5px;
  line-height: 1.65;
  color: rgba(244, 239, 230, .86);
  overflow-wrap: anywhere;
}

.c28-footer__base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(16px, 3vw, 34px);
  padding-block: 20px 26px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--stone);
}

.c28-footer__base p { max-width: none; }

.c28-footer__legal { color: rgba(244, 239, 230, .78); }

.c28-footer__mark {
  margin-left: auto;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(140, 154, 166, .7);
}

/* =========================================================
   共享内容组件
   ========================================================= */
.c28-main {
  display: block;
  padding-block: clamp(30px, 4.6vw, 68px) clamp(20px, 3vw, 40px);
}

.c28-section {
  padding-block: clamp(26px, 4.2vw, 54px);
}

.c28-section + .c28-section {
  border-top: 1px solid rgba(140, 154, 166, .3);
}

.c28-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate);
}

.c28-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .65;
}

.c28-kicker--light { color: var(--celadon); }

.c28-rule {
  height: 1px;
  margin-block: clamp(22px, 3.6vw, 42px);
  background: linear-gradient(90deg, rgba(140, 154, 166, .8), rgba(140, 154, 166, .1));
}

.c28-lead {
  font-size: clamp(16.5px, 1.55vw, 19px);
  line-height: 1.78;
  color: var(--slate);
  max-width: 62ch;
}

.c28-prose {
  max-width: 68ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--slate);
}

.c28-prose > * + * { margin-top: 1.05em; }

.c28-prose h2 {
  font-size: clamp(23px, 2.6vw, 32px);
  color: var(--ink);
  margin-top: 1.9em;
}

.c28-prose h3 {
  font-size: clamp(18px, 1.9vw, 23px);
  color: var(--ink);
  margin-top: 1.6em;
}

.c28-prose strong { color: var(--ink); }

.c28-prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.c28-prose a:hover { color: var(--signal-deep); }

.c28-prose ul {
  display: grid;
  gap: .5em;
}

.c28-prose ul > li {
  position: relative;
  padding-left: 22px;
}

.c28-prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .64em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--signal);
}

.c28-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(58, 74, 90, .06);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slate);
}

.c28-tag--signal {
  border-color: rgba(255, 106, 43, .55);
  background: rgba(255, 106, 43, .12);
  color: var(--ink);
}

.c28-tag--celadon {
  border-color: rgba(46, 196, 182, .55);
  background: rgba(46, 196, 182, .14);
  color: var(--celadon-deep);
}

.c28-tag--clay {
  border-color: rgba(201, 123, 90, .52);
  background: rgba(201, 123, 90, .14);
  color: #8A4A2C;
}

.c28-badge {
  display: inline-grid;
  place-items: center;
  min-width: 28px;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
}

.c28-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
  color: var(--stone);
}

.c28-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* 面包屑 */
.c28-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(16px, 2.6vw, 28px);
  font-size: 12.5px;
  color: var(--slate);
}

.c28-crumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.c28-crumbs__link {
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.c28-crumbs__link:hover {
  color: var(--ink);
  border-bottom-color: var(--signal);
}

.c28-crumbs__sep {
  font-family: var(--font-mono);
  color: var(--stone);
}

.c28-crumbs__current {
  font-weight: 700;
  color: var(--ink);
}

/* 栅格 */
.c28-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.c28-grid--rail {
  grid-template-columns: minmax(190px, 236px) minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 52px);
}

.c28-grid--cards {
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
}

/* 侧边章节轨道 */
.c28-rail {
  display: grid;
  align-content: start;
  gap: 14px;
}

.c28-rail__sticky {
  position: sticky;
  top: clamp(88px, 14vh, 168px);
  display: grid;
  gap: 14px;
}

.c28-rail__label {
  position: relative;
  max-width: none;
  padding-left: 15px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--stone);
}

.c28-rail__label::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--celadon);
}

.c28-rail__list {
  display: grid;
  gap: 2px;
  border-left: 1px solid rgba(140, 154, 166, .38);
}

.c28-rail__link {
  display: block;
  margin-left: -1px;
  padding: 8px 0 8px 16px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--slate);
  transition: color .18s var(--ease), border-color .18s var(--ease), padding-left .18s var(--ease);
}

.c28-rail__link:hover {
  color: var(--ink);
  padding-left: 20px;
}

.c28-rail__link[aria-current="true"],
.c28-rail__link[aria-current="page"] {
  border-left-color: var(--signal);
  color: var(--ink);
  font-weight: 700;
}

/* 卡片 */
.c28-card {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(16px, 2vw, 24px);
  border: 1px solid rgba(140, 154, 166, .34);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .48);
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .22s var(--ease);
}

.c28-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 106, 43, .46);
  box-shadow: 0 22px 42px -30px rgba(11, 27, 43, .6);
}

.c28-card--ink {
  background: var(--ink);
  border-color: rgba(140, 154, 166, .3);
  color: var(--paper);
}

.c28-card--ink .c28-lead,
.c28-card--ink p { color: rgba(244, 239, 230, .76); }

/* 旁注 */
.c28-note {
  padding: 10px 0 10px 16px;
  border-left: 2px solid var(--celadon);
  background: linear-gradient(90deg, rgba(46, 196, 182, .09), transparent 72%);
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

/* 图片容器 */
.c28-figure {
  display: grid;
  gap: 10px;
  margin: 0;
}

.c28-figure__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 72% 18%, rgba(46, 196, 182, .3), transparent 56%),
    radial-gradient(circle at 18% 82%, rgba(255, 106, 43, .24), transparent 58%),
    linear-gradient(160deg, #0B1B2B, #17334A);
}

.c28-figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(244, 239, 230, .12);
  border-radius: inherit;
  pointer-events: none;
}

.c28-figure__media > img,
.c28-figure__media > picture > img,
.c28-figure__media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.c28-figure--wide .c28-figure__media { aspect-ratio: 21 / 9; }
.c28-figure--square .c28-figure__media { aspect-ratio: 1 / 1; }
.c28-figure--tall .c28-figure__media { aspect-ratio: 4 / 5; }

.c28-figure__caption {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--stone);
}

/* 屏幕阅读器专用 */
.c28-visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .c28-grid--rail {
    grid-template-columns: minmax(0, 1fr);
  }

  .c28-rail__sticky {
    position: static;
  }

  .c28-rail__list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    border-left: 0;
  }

  .c28-rail__link {
    margin-left: 0;
    padding: 6px 12px;
    border: 1px solid rgba(140, 154, 166, .4);
    border-radius: 999px;
    font-size: 12.5px;
  }

  .c28-rail__link:hover { padding-left: 12px; }

  .c28-rail__link[aria-current="true"],
  .c28-rail__link[aria-current="page"] {
    border-color: rgba(255, 106, 43, .6);
    background: rgba(255, 106, 43, .1);
  }
}

@media (max-width: 1000px) {
  .c28-masthead__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .c28-masthead__center { display: none; }

  .c28-navtoggle { display: inline-flex; }

  .c28-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--ink-deep);
    border-top: 1px solid var(--line-dark);
    box-shadow: 0 26px 44px rgba(4, 10, 16, .46);
    transition: max-height .32s var(--ease), visibility 0s linear .32s;
  }

  .c28-nav[data-open="true"] {
    max-height: min(72vh, 540px);
    overflow-y: auto;
    visibility: visible;
    transition: max-height .32s var(--ease), visibility 0s linear 0s;
  }

  .c28-nav__list {
    flex-direction: column;
    gap: 2px;
    width: 100%;
    padding: 10px var(--gutter) 18px;
  }

  .c28-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 12px;
    border-radius: 12px;
    border-bottom: 1px solid rgba(140, 154, 166, .14);
    text-align: left;
  }

  .c28-nav__link::after { display: none; }

  .c28-nav__link:hover { background: rgba(244, 239, 230, .08); }

  .c28-nav__link[aria-current="page"] {
    background: rgba(255, 106, 43, .12);
    box-shadow: inset 3px 0 0 var(--signal);
  }

  .c28-nav__cn { font-size: 15px; }
  .c28-nav__en { font-size: 10px; }

  .c28-footer__top {
    grid-template-columns: minmax(0, 1fr);
  }

  .c28-footer__tagline { max-width: 34ch; }
}

@media (max-width: 760px) {
  .c28-strip__item--stone { display: none; }

  .c28-footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .c28-footer__col--contact {
    grid-column: 1 / -1;
  }

  .c28-footer__orbit {
    width: 340px;
    height: 340px;
    top: -110px;
    right: -120px;
    opacity: .7;
  }

  .c28-footer__orbit::before { inset: 44px; }
  .c28-footer__orbit::after { inset: 100px; }

  .c28-footer__mark { margin-left: 0; }
}

@media (max-width: 620px) {
  .c28-masthead__aside .c28-cta--ghost { display: none; }

  .c28-cta {
    padding: 9px 14px;
    font-size: 12px;
  }

  .c28-header__strip-inner {
    gap: 14px;
    font-size: 10px;
    letter-spacing: .08em;
  }

  .c28-brand__mark { width: 38px; height: 38px; }
  .c28-brand__name { font-size: 17px; }
  .c28-brand__latin { font-size: 8.5px; letter-spacing: .16em; }

  .c28-footer__cols {
    grid-template-columns: minmax(0, 1fr);
  }

  .c28-contact-line {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .c28-footer__base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .c28-navtoggle__text { display: none; }

  .c28-navtoggle { padding: 10px 12px; }
}

/* ---------- 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .c28-header__strip,
  .c28-masthead,
  .c28-nav { transition: none !important; }

  .c28-cta:hover,
  .c28-card:hover { transform: none; }

  .c28-brand:hover .c28-brand__ring--2 { transform: none; }
}