/* ================================================================
   云开KAIYUN / 全站共享样式 / /assets/site.css
   设计体系：数据叙事 · 纸张叠层 · 斜切动量 · 橙黑高对比
   ================================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --c-primary: #FF4D00;
  --c-dark: #0A0F1A;
  --c-paper: #F5F5F0;
  --c-white: #FFFFFF;
  --c-deep: #1A2A6A;
  --c-neon: #00FFAA;
  --c-alert: #E62E00;
  --c-ink: #3A404A;
  --c-line: #D0D4DA;
  --c-data: #007BFF;

  --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, monospace;

  --container-w: 1440px;
  --container-pad: clamp(20px, 4vw, 56px);
  --gap: clamp(20px, 3vw, 40px);
  --header-h: 88px;
  --header-h-mobile: 64px;
  --section-y: clamp(64px, 10vw, 144px);
  --radius: 4px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-panel: 0 1px 0 rgba(10, 15, 26, 0.04), 0 12px 32px rgba(10, 15, 26, 0.08);
  --shadow-float: 0 4px 0 rgba(10, 15, 26, 0.08), 0 24px 48px rgba(10, 15, 26, 0.16);
}

/* ---------- 2. Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-paper);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(255, 77, 0, 0.45);
  text-underline-offset: 4px;
}

a:hover {
  color: var(--c-primary);
  text-decoration-color: var(--c-primary);
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--c-dark);
}

p {
  text-wrap: pretty;
}

hr {
  border: 0;
  border-top: 1px solid var(--c-line);
  margin: 2em 0;
}

::selection {
  background: var(--c-primary);
  color: var(--c-white);
}

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

/* ---------- 3. 通用排版 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-primary);
}

.eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  flex: 0 0 auto;
  background: currentColor;
}

.page-title {
  font-size: clamp(2.2rem, 5.6vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 900;
  margin-top: 16px;
  text-wrap: balance;
}

.section-title {
  font-size: clamp(1.6rem, 3.6vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 900;
  margin-top: 14px;
  text-wrap: balance;
}

.lede {
  margin-top: 20px;
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  line-height: 1.75;
  max-width: 62ch;
  text-wrap: pretty;
}

.prose {
  max-width: 72ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-ink);
}

.prose h2,
.prose h3 {
  margin-top: 2em;
  margin-bottom: 0.5em;
}

.prose h2 {
  font-size: 1.4rem;
}

.prose h3 {
  font-size: 1.15rem;
}

.prose p {
  margin-bottom: 1.1em;
}

.prose ul,
.prose ol {
  margin: 1em 0 1.2em;
  padding-left: 1.4em;
}

.prose ul {
  list-style: square;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4em;
}

.prose a {
  color: var(--c-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 77, 0, 0.5);
}

.prose a:hover {
  color: var(--c-primary);
}

.prose blockquote {
  margin: 1.5em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--c-primary);
  background: var(--c-paper);
  font-weight: 600;
  color: var(--c-dark);
}

/* ---------- 4. 版面容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

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

.section--dark {
  background: var(--c-dark);
  color: rgba(245, 245, 240, 0.78);
}

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

.section--white {
  background: var(--c-white);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(32px, 5vw, 80px);
  align-items: start;
}

.split--swap > :first-child {
  order: 2;
}

.split--swap > :last-child {
  order: 1;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

/* ---------- 5. 按钮与链接 ---------- */
.brand-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--c-primary);
  color: var(--c-white);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  border: 0;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: filter 0.25s ease, transform 0.25s var(--ease-out);
}

.brand-button:hover {
  color: var(--c-white);
  filter: brightness(1.08) drop-shadow(0 8px 20px rgba(255, 77, 0, 0.4));
  transform: translateY(-2px);
}

.brand-button--nav {
  padding: 9px 18px;
  font-size: 0.85rem;
}

.brand-button--ghost {
  background: var(--c-white);
  color: var(--c-dark);
  border: 2px solid var(--c-dark);
  clip-path: none;
}

.brand-button--ghost:hover {
  color: var(--c-primary);
  border-color: var(--c-primary);
  filter: none;
}

.brand-button__arrow {
  font-family: var(--font-mono);
  font-size: 0.9em;
  transition: transform 0.25s var(--ease-out);
}

.brand-button:hover .brand-button__arrow {
  transform: translate(2px, -2px);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--c-dark);
  text-decoration: none;
}

.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--c-primary);
  transition: transform 0.3s var(--ease-out);
}

.link-arrow:hover {
  color: var(--c-primary);
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

/* ---------- 6. 头部与导航 ---------- */
.skip-link {
  position: fixed;
  top: -56px;
  left: 16px;
  z-index: 400;
  padding: 12px 20px;
  background: var(--c-primary);
  color: var(--c-white);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0 0 var(--radius) var(--radius);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-primary), var(--c-neon));
  z-index: 300;
  pointer-events: none;
}

.site-header {
  --header-text: var(--c-paper);
  --header-muted: rgba(245, 245, 240, 0.64);
  --header-line: rgba(245, 245, 240, 0.18);

  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 220;
  height: var(--header-h);
  color: var(--header-text);
  background: transparent;
  border-bottom: 1px solid var(--header-line);
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header__inner {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 3vw, 40px);
}

.site-header[data-scrolled="true"] {
  --header-text: var(--c-dark);
  --header-muted: var(--c-ink);
  --header-line: rgba(10, 15, 26, 0.1);
  background: var(--c-white);
  box-shadow: 0 8px 32px rgba(10, 15, 26, 0.1);
}

html:not(.js) .site-header {
  --header-text: var(--c-dark);
  --header-muted: var(--c-ink);
  --header-line: var(--c-line);
  background: var(--c-white);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  background: var(--c-primary);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.site-brand__mark-text {
  line-height: 1;
  transform: translateY(-1px);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1;
}

.site-brand__name {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: 1.12rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: inherit;
  text-decoration: none;
}

.site-brand__en {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--c-primary);
}

.site-brand__slogan {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--header-muted);
  border-left: 2px solid var(--c-primary);
  padding-left: 7px;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(12px, 2vw, 24px);
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav__item {
  position: relative;
}

.main-nav__link {
  display: inline-block;
  padding: 10px 12px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--header-text);
  text-decoration: none;
  letter-spacing: 0.02em;
  position: relative;
  transition: color 0.2s ease;
}

.main-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s var(--ease-out);
}

.main-nav__link:hover {
  color: var(--c-primary);
}

.main-nav__link:hover::after,
.main-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.main-nav__link[aria-current="page"] {
  color: var(--c-primary);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--header-line);
  border-radius: var(--radius);
  color: var(--header-text);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-scrim {
  position: fixed;
  inset: var(--header-h-mobile) 0 0 0;
  z-index: 205;
  background: rgba(10, 15, 26, 0.62);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.nav-scrim.is-visible {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 980px) {
  .site-header {
    height: var(--header-h-mobile);
  }

  .site-header__inner {
    height: var(--header-h-mobile);
  }

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

  .main-nav {
    position: fixed;
    top: var(--header-h-mobile);
    right: 0;
    bottom: 0;
    z-index: 210;
    width: min(82vw, 400px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: clamp(24px, 6vw, 48px) var(--container-pad) 48px;
    overflow-y: auto;
    background: var(--c-dark);
    box-shadow: none;
    transform: translateX(100%);
    transition: transform 0.45s var(--ease-out), box-shadow 0.3s ease;
  }

  .main-nav[data-open="true"] {
    transform: translateX(0);
    box-shadow: -24px 0 64px rgba(10, 15, 26, 0.45);
  }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 24px;
    margin-bottom: 24px;
  }

  .main-nav__link {
    display: block;
    padding: 14px 8px;
    font-size: 1.25rem;
    color: rgba(245, 245, 240, 0.86);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

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

  .main-nav__link:hover,
  .main-nav__link[aria-current="page"] {
    color: var(--c-primary);
  }

  .main-nav .brand-button {
    align-self: flex-start;
    margin-top: 8px;
  }
}

@media (max-width: 560px) {
  .site-brand__slogan {
    display: none;
  }

  .site-brand__name {
    font-size: 1rem;
  }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-dark);
  color: rgba(245, 245, 240, 0.72);
  font-size: 0.94rem;
  line-height: 1.7;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1;
  background: linear-gradient(90deg, var(--c-primary) 0 45%, var(--c-deep) 45% 70%, var(--c-neon) 70% 100%);
}

.site-footer a {
  color: rgba(245, 245, 240, 0.78);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--c-primary);
}

.site-footer h1,
.site-footer h2,
.site-footer h3 {
  color: var(--c-paper);
}

.site-footer__inner {
  padding-top: clamp(64px, 8vw, 128px);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(32px, 5vw, 72px);
}

.site-footer__brand {
  display: grid;
  gap: 14px;
  align-content: start;
}

.site-footer__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  text-decoration: none;
  border-left: 4px solid var(--c-primary);
  padding-left: 12px;
  line-height: 1;
}

.site-footer__logo-en {
  font-family: var(--font-mono);
  font-size: 0.7em;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-primary);
}

.site-footer__slogan {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--c-primary);
}

.site-footer__desc {
  color: rgba(245, 245, 240, 0.64);
}

.site-footer__trust {
  font-size: 0.82rem;
  line-height: 1.75;
  color: rgba(245, 245, 240, 0.46);
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  padding-left: 12px;
  margin-top: 4px;
}

.site-footer__col {
  display: grid;
  align-content: start;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-footer__list {
  display: grid;
  gap: 10px;
  font-size: 0.88rem;
}

.site-footer__item {
  line-height: 1.6;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: clamp(40px, 6vw, 64px);
  padding-block: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: rgba(245, 245, 240, 0.44);
}

.site-footer__word {
  margin-top: clamp(40px, 6vw, 80px);
  text-align: center;
  font-family: var(--font-mono);
  font-size: clamp(5.5rem, 20vw, 18rem);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.06em;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(245, 245, 240, 0.13);
  transform: translateY(24%);
  pointer-events: none;
  user-select: none;
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ---------- 8. 页面首屏基础 ---------- */
.page-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: calc(100vh - var(--header-h));
  padding-top: calc(var(--header-h) + clamp(32px, 6vw, 72px));
  background: var(--c-dark);
  color: rgba(245, 245, 240, 0.78);
  overflow: hidden;
}

.page-hero--full {
  min-height: 100vh;
}

.page-hero h1,
.page-hero h2,
.page-hero h3 {
  color: var(--c-paper);
}

.page-hero > .container {
  position: relative;
  z-index: 2;
  padding-bottom: clamp(40px, 7vw, 80px);
}

@media (max-width: 980px) {
  .page-hero {
    min-height: calc(100vh - var(--header-h-mobile));
    padding-top: calc(var(--header-h-mobile) + clamp(20px, 5vw, 40px));
  }
}

/* ---------- 9. 卡片、标签与纸张叠层 ---------- */
.panel {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: clamp(24px, 3vw, 40px);
  box-shadow: var(--shadow-panel);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary) 0 55%, var(--c-neon) 55% 100%);
  border-radius: var(--radius) var(--radius) 0 0;
}

.panel--dark {
  background: var(--c-dark);
  color: var(--c-paper);
  border-color: transparent;
  box-shadow: none;
}

.panel--dark::before {
  background: linear-gradient(90deg, var(--c-neon) 0 55%, var(--c-primary) 55% 100%);
}

.panel--paper {
  background: var(--c-paper);
  border-color: var(--c-line);
  box-shadow: none;
}

.panel__title {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.panel__body {
  color: var(--c-ink);
}

.panel--dark .panel__body {
  color: rgba(245, 245, 240, 0.74);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: var(--c-white);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--c-ink);
  white-space: nowrap;
}

.chip--primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: var(--c-white);
}

.chip--dark {
  background: var(--c-dark);
  border-color: var(--c-dark);
  color: var(--c-paper);
}

.chip--neon {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: var(--c-dark);
}

.num-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 26px;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--c-primary);
  border: 1px solid currentColor;
  transform: skewX(-8deg);
}

/* ---------- 10. 数据组件 ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.stat {
  position: relative;
  padding: 22px 22px 24px;
  background: var(--c-paper);
  border-left: 4px solid var(--c-primary);
}

.stat--dark {
  background: var(--c-dark);
  border-left-color: var(--c-neon);
}

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3.6vw, 3rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--c-dark);
  letter-spacing: -0.04em;
}

.stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.06em;
}

.stat--dark .stat__value {
  color: var(--c-paper);
}

.stat--dark .stat__label {
  color: rgba(245, 245, 240, 0.6);
}

.data-line {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink);
}

.data-line::before {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-line) 30%, var(--c-primary));
}

.data-line::after {
  content: "";
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--c-primary);
  transform: rotate(45deg);
}

.dot-grid {
  background-image: radial-gradient(rgba(245, 245, 240, 0.16) 1px, transparent 1.6px);
  background-size: 26px 26px;
}

.dot-grid--orange {
  background-image: radial-gradient(rgba(255, 77, 0, 0.3) 1px, transparent 1.6px);
}

.dot-grid--dark {
  background-image: radial-gradient(rgba(10, 15, 26, 0.14) 1px, transparent 1.6px);
}

/* ---------- 11. 图片容器 ---------- */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--c-dark);
  border-radius: var(--radius);
}

.image-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease-out);
}

.image-frame:hover img {
  transform: scale(1.04);
}

.image-frame--16-9 {
  aspect-ratio: 16 / 9;
}

.image-frame--4-3 {
  aspect-ratio: 4 / 3;
}

.image-frame--1-1 {
  aspect-ratio: 1 / 1;
}

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

.image-frame--cut {
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  border-radius: 0;
}

.image-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 16px 12px;
  background: linear-gradient(0deg, rgba(10, 15, 26, 0.78), transparent);
  color: var(--c-white);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.image-frame__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--c-dark);
  color: rgba(245, 245, 240, 0.35);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

/* ---------- 12. 标签页、面包屑、跑马灯 ---------- */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 2px solid var(--c-line);
  margin-bottom: 28px;
}

.tabs__trigger {
  position: relative;
  padding: 12px 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.9rem;
  color: var(--c-ink);
  border: 0;
  background: none;
  transition: color 0.2s ease;
}

.tabs__trigger::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -2px;
  height: 3px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s var(--ease-out);
}

.tabs__trigger:hover {
  color: var(--c-primary);
}

.tabs__trigger:hover::after,
.tabs__trigger.is-active::after {
  transform: scaleX(1);
}

.tabs__trigger.is-active {
  color: var(--c-primary);
}

.tabs--dark .tabs__list {
  border-bottom-color: rgba(255, 255, 255, 0.22);
}

.tabs--dark .tabs__trigger {
  color: rgba(245, 245, 240, 0.72);
}

.tabs--dark .tabs__trigger.is-active,
.tabs--dark .tabs__trigger:hover {
  color: var(--c-primary);
}

.tabs__panel[hidden] {
  display: none;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--c-ink);
}

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

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 10px;
  color: var(--c-line);
}

.breadcrumbs__link {
  color: inherit;
  text-decoration: none;
}

.breadcrumbs__link:hover {
  color: var(--c-primary);
}

.breadcrumbs__current {
  color: var(--c-primary);
}

.marquee {
  position: relative;
  overflow: hidden;
  padding-block: 14px;
}

.marquee::before {
  content: "";
  position: absolute;
  inset: -24px;
  background: var(--c-dark);
  transform: skewY(-1.2deg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), inset 0 -1px 0 rgba(255, 255, 255, 0.08);
}

.marquee__track {
  position: relative;
  z-index: 1;
  display: flex;
  width: max-content;
  animation: marquee-slide 36s linear infinite;
}

.marquee__item {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  padding-right: 28px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 245, 240, 0.72);
  white-space: nowrap;
}

.marquee__item::after {
  content: "◆";
  font-size: 0.55rem;
  color: var(--c-primary);
}

@keyframes marquee-slide {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-50%);
  }
}

/* ---------- 13. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 180;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  background: var(--c-dark);
  color: var(--c-paper);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 1.3rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s var(--ease-out), visibility 0.3s ease, background 0.2s ease;
}

.back-top:hover {
  background: var(--c-primary);
  border-color: var(--c-primary);
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (max-width: 640px) {
  .back-top {
    right: 14px;
    bottom: 14px;
    width: 44px;
    height: 44px;
  }
}

/* ---------- 14. 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 15. 响应式网格收敛 ---------- */
@media (max-width: 960px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .split,
  .split--swap {
    grid-template-columns: 1fr;
  }

  .split--swap > :first-child {
    order: 0;
  }

  .split--swap > :last-child {
    order: 0;
  }
}

@media (max-width: 620px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ---------- 16. 深色区与区块文字 ---------- */
.section--dark h1,
.section--dark h2,
.section--dark h3,
.page-hero h1,
.page-hero h2,
.page-hero h3,
.site-footer h1,
.site-footer h2,
.site-footer h3 {
  color: var(--c-paper);
}

.section--dark .lede {
  color: rgba(245, 245, 240, 0.78);
}

/* ---------- 17. 动效缩减 ---------- */
@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-behavior: auto !important;
  }

  .marquee__track {
    animation: none;
  }

  .scroll-progress {
    display: none;
  }

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