/* ==========================================================================
   搏鱼体育服务 · 共享样式表  /assets/site.css
   深海蓝暗场 · 信号橙动作色 · 切角面板 · 等宽数据字 · 侧边轨道导航
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --c-deep:   #0B2239;
  --c-abyss:  #123A5C;
  --c-tide:   #1E6FA8;
  --c-signal: #FF6B2C;
  --c-clay:   #C4572A;
  --c-rock:   #5A6570;
  --c-moss:   #4A6B4E;
  --c-neon:   #9BE564;
  --c-spray:  #F2F6F8;
  --c-bone:   #EDE7DC;
  --c-ink:    #0A1017;

  --f-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
            "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas,
            "Liberation Mono", "Courier New", monospace;

  --fs-display: clamp(2.25rem, 5.6vw, 5.25rem);
  --fs-xl:      clamp(1.75rem, 3.6vw, 3.25rem);
  --fs-lg:      clamp(1.375rem, 2.4vw, 2.25rem);
  --fs-md:      clamp(1.125rem, 1.6vw, 1.5rem);
  --fs-base:    1rem;
  --fs-sm:      0.875rem;
  --fs-xs:      0.75rem;

  --lh-tight: 1.1;
  --lh-body:  1.7;

  --rail-w: 88px;
  --top-h:  60px;
  --cut:    12px;

  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --band:   clamp(3rem, 8vw, 6.5rem);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-block-start: 1.5rem;
}

body {
  margin: 0;
  padding-inline-start: var(--rail-w);
  font-family: var(--f-sans);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: var(--lh-body);
  color: var(--c-spray);
  background-color: var(--c-deep);
  min-height: 100%;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

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

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

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

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

hr {
  border: 0;
  border-block-start: 1px solid rgba(90, 101, 112, 0.45);
  margin: 0;
}

::selection { background: var(--c-signal); color: #FFFFFF; }

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

/* ---------- 3. 排版工具 ---------- */
.display-title {
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
  transform: skewX(-9deg);
  transform-origin: left bottom;
  display: block;
  max-width: 22ch;
}

.slant-title {
  font-size: var(--fs-lg);
  font-weight: 900;
  transform: skewX(-9deg);
  transform-origin: left bottom;
  display: inline-block;
}

.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }

.num {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lede {
  font-size: var(--fs-md);
  line-height: 1.6;
  max-width: 34ch;
}

.prose {
  max-width: 34ch;
  font-size: var(--fs-base);
  line-height: var(--lh-body);
}

.prose p + p { margin-block-start: 1em; }

.annot {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  color: var(--c-rock);
  text-transform: uppercase;
}

.annot--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.32em;
}

.text-signal { color: var(--c-signal); }
.text-clay   { color: var(--c-clay); }
.text-rock   { color: var(--c-rock); }
.text-neon   { color: var(--c-neon); }

/* ---------- 4. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 1rem;
  inset-inline-start: calc(var(--rail-w) + 0.75rem);
  z-index: 300;
  padding: 0.7rem 1.1rem;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-ink);
  background-color: var(--c-signal);
  transform: translateY(-260%);
  transition: transform 0.22s var(--ease);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

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

/* ---------- 5. 站点头部：左侧轨道 ---------- */
.site-header {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 200;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background-color: var(--c-deep);
  background-image:
    repeating-linear-gradient(105deg, rgba(30, 111, 168, 0.16) 0 1px, transparent 1px 16px),
    linear-gradient(180deg, #0C2540 0%, #081824 100%);
  border-inline-end: 1px solid rgba(90, 101, 112, 0.4);
}

.brand-mark {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  padding: 1.15rem 0.4rem 1.1rem;
  color: var(--c-spray);
  border-block-end: 1px solid rgba(90, 101, 112, 0.35);
}

.brand-mark__glyph {
  width: 10px;
  height: 10px;
  background-color: var(--c-signal);
  transform: skewX(-14deg);
  transition: background-color 0.2s var(--ease);
}

.brand-mark:hover .brand-mark__glyph { background-color: var(--c-neon); }

.brand-mark__name {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 0.9375rem;
  font-weight: 900;
  letter-spacing: 0.24em;
  color: var(--c-spray);
}

.rail-nav {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-block: 0.5rem;
  scrollbar-width: thin;
}

.rail-nav__list {
  display: flex;
  flex-direction: column;
}

.rail-nav__item { position: relative; }

.rail-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.8rem 0.25rem;
  color: #93A6B6;
  text-align: center;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.rail-nav__link::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 50%;
  width: 3px;
  height: 0;
  background-color: var(--c-signal);
  transform: translateY(-50%);
  transition: height 0.22s var(--ease);
}

.rail-nav__link:hover { color: var(--c-spray); }

.rail-nav__link:hover::before,
.rail-nav__link[aria-current="page"]::before { height: 62%; }

.rail-nav__link[aria-current="page"] {
  color: var(--c-spray);
  background-color: rgba(30, 111, 168, 0.26);
}

.rail-nav__index {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-rock);
  transition: color 0.18s var(--ease);
}

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

.rail-nav__label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.rail-cta {
  position: relative;
  z-index: 1;
  flex: 0 0 auto;
  margin: 0.6rem 0.75rem 1.25rem;
  padding: 1rem 0.3rem;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 900;
  letter-spacing: 0.24em;
  color: var(--c-ink);
  background-color: var(--c-signal);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.rail-cta:hover {
  background-color: var(--c-spray);
  color: var(--c-deep);
}

.nav-toggle { display: none; }

.rail-meter {
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
  width: 3px;
  background-color: rgba(90, 101, 112, 0.22);
  pointer-events: none;
}

.rail-meter__fill {
  display: block;
  width: 100%;
  height: 0;
  background-image: linear-gradient(180deg, var(--c-signal) 0%, var(--c-neon) 100%);
  transition: height 0.12s linear;
}

/* ---------- 6. 移动端抽屉 ---------- */
.drawer-scrim {
  position: fixed;
  inset: 0;
  z-index: 210;
  background-color: rgba(10, 16, 23, 0.66);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s var(--ease);
}

.drawer-scrim[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  inset-block: 0;
  inset-inline-end: 0;
  z-index: 220;
  width: min(340px, 86vw);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  padding: 1rem 1.1rem 2rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: var(--c-deep);
  background-image: linear-gradient(180deg, #0C2540 0%, #081824 100%);
  border-inline-start: 1px solid rgba(90, 101, 112, 0.5);
  transform: translateX(calc(100% + 4px));
  pointer-events: none;
  transition: transform 0.3s var(--ease);
}

.drawer[data-open="true"] {
  transform: translateX(0);
  pointer-events: auto;
}

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block-end: 0.9rem;
  border-block-end: 1px solid rgba(90, 101, 112, 0.42);
}

.drawer__brand {
  font-size: 0.9375rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--c-spray);
}

.drawer__close {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  font-size: 0.875rem;
  color: var(--c-spray);
  background-color: rgba(30, 111, 168, 0.22);
  transition: background-color 0.18s var(--ease);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.drawer__close:hover { background-color: var(--c-signal); color: var(--c-ink); }

.drawer__direct {
  display: grid;
  gap: 0.55rem;
}

.direct-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--c-spray);
  background-color: rgba(18, 58, 92, 0.72);
  border-inline-start: 2px solid var(--c-rock);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

.direct-link::after {
  content: "→";
  font-family: var(--f-mono);
  color: var(--c-signal);
}

.direct-link:hover {
  border-inline-start-color: var(--c-signal);
  background-color: rgba(30, 111, 168, 0.5);
}

.drawer__nav { padding-block-start: 0.2rem; }

.drawer__list {
  display: flex;
  flex-direction: column;
}

.drawer__link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.7rem 0.2rem;
  font-size: var(--fs-base);
  font-weight: 700;
  color: #A9BAC8;
  border-block-end: 1px solid rgba(90, 101, 112, 0.26);
  transition: color 0.18s var(--ease), padding-inline-start 0.18s var(--ease);
}

.drawer__link:hover { color: var(--c-spray); padding-inline-start: 0.5rem; }

.drawer__link[aria-current="page"] {
  color: var(--c-signal);
  padding-inline-start: 0.5rem;
}

.drawer__index {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-rock);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter) 0;
  color: #A9BAC8;
  background-color: var(--c-deep);
  background-image: linear-gradient(180deg, #081824 0%, #0C2540 100%);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-start: 0;
  height: 3px;
  background-image: repeating-linear-gradient(115deg, var(--c-signal) 0 26px, transparent 26px 56px);
}

.footer__grid {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) repeat(4, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}

.footer__brand { display: flex; flex-direction: column; gap: 0.75rem; }

.footer__logo {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--c-spray);
}

.footer__logo:hover { color: var(--c-signal); }

.footer__line {
  max-width: 30ch;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: #8FA3B3;
}

.footer__place {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-rock);
}

.footer__pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--c-neon);
  animation: footerPulse 3s ease-in-out infinite;
}

@keyframes footerPulse {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50%      { opacity: 1;    transform: scale(1.15); }
}

.footer__col { display: flex; flex-direction: column; gap: 0.9rem; }

.footer__title {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--c-rock);
}

.footer__list { display: flex; flex-direction: column; gap: 0.55rem; }

.footer__link {
  position: relative;
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: #C6D4DF;
  transition: color 0.18s var(--ease);
}

.footer__link::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: -2px;
  width: 100%;
  height: 1px;
  background-color: var(--c-signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.footer__link:hover { color: var(--c-spray); }
.footer__link:hover::after { transform: scaleX(1); }

.footer__bar {
  width: 100%;
  max-width: 1280px;
  margin: clamp(2rem, 5vw, 3.25rem) auto 0;
  padding-block: 1.15rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.5rem;
  border-block-start: 1px solid rgba(90, 101, 112, 0.4);
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  color: var(--c-rock);
}

.footer__meta--copy { margin-inline-start: auto; }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  font-size: var(--fs-sm);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  text-align: center;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.btn--signal {
  color: var(--c-ink);
  background-color: var(--c-signal);
}

.btn--signal:hover { background-color: var(--c-spray); color: var(--c-deep); }

.btn--ghost {
  color: var(--c-spray);
  background-color: rgba(30, 111, 168, 0.24);
}

.btn--ghost:hover { background-color: rgba(30, 111, 168, 0.55); }

.btn--line {
  color: var(--c-ink);
  background-color: rgba(10, 16, 23, 0.08);
}

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

/* ---------- 9. 内联链接 ---------- */
.link-underline {
  position: relative;
  color: var(--c-tide);
  font-weight: 600;
  transition: color 0.18s var(--ease);
}

.link-underline::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: -2px;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.link-underline:hover { color: var(--c-signal); }
.link-underline:hover::after { transform: scaleX(1); }

.surface-bone .link-underline { color: var(--c-clay); }
.surface-bone .link-underline:hover { color: var(--c-ink); }

/* ---------- 10. 面包屑 ---------- */
.breadcrumbs {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--c-rock);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: 0.5rem; }

.breadcrumbs__link { color: var(--c-rock); transition: color 0.18s var(--ease); }
.breadcrumbs__link:hover { color: var(--c-signal); }

.breadcrumbs__sep { color: rgba(90, 101, 112, 0.7); }

.breadcrumbs__item[aria-current="page"] .breadcrumbs__link,
.breadcrumbs__item[aria-current="page"] { color: var(--c-signal); }

/* ---------- 11. 布局容器与分区 ---------- */
.wrap {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: 820px; }

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

.surface-bone {
  background-color: var(--c-bone);
  color: var(--c-ink);
}

.surface-bone .annot,
.surface-bone .annot--vertical { color: var(--c-clay); }

.surface-abyss {
  background-color: var(--c-abyss);
  color: var(--c-spray);
}

/* ---------- 12. 编号章节体系 ---------- */
.chapter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.85rem;
}

.chapter__index {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-signal);
}

.chapter__title {
  display: block;
  font-size: var(--fs-xl);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
  transform: skewX(-9deg);
  transform-origin: left bottom;
  max-width: 24ch;
  color: inherit;
}

.chapter__lede {
  max-width: 34ch;
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: #B7C6D2;
}

.surface-bone .chapter__lede { color: #3A444E; }

.chapter__note {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--c-rock);
}

.surface-bone .chapter__index { color: var(--c-clay); }

/* ---------- 13. 面板、卡片、标签 ---------- */
.panel {
  --panel-bg: var(--c-abyss);
  --panel-fg: var(--c-spray);
  position: relative;
  padding: clamp(1.15rem, 2.6vw, 1.9rem);
  background-color: var(--panel-bg);
  color: var(--panel-fg);
  transition: background-color 0.2s var(--ease);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.panel::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 3px;
  background-color: var(--c-signal);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.22s var(--ease);
}

.panel:hover::before,
.panel.is-active::before { transform: scaleY(1); }

.panel--bone {
  --panel-bg: #FFFFFF;
  --panel-fg: var(--c-ink);
}

.panel--wide { grid-column: 1 / -1; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.15rem 1.25rem;
  background-color: rgba(18, 58, 92, 0.6);
  border-inline-start: 1px solid rgba(90, 101, 112, 0.55);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.card:hover {
  background-color: rgba(30, 111, 168, 0.42);
  border-inline-start-color: var(--c-signal);
}

.card__meta {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-rock);
}

.card__title {
  font-size: var(--fs-md);
  font-weight: 800;
  line-height: 1.3;
  color: var(--c-spray);
}

.card__text {
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: #B7C6D2;
  max-width: 40ch;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.6rem;
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--c-spray);
  background-color: rgba(90, 101, 112, 0.35);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.tag--moss   { background-color: rgba(74, 107, 78, 0.85); }
.tag--signal { background-color: var(--c-signal); color: var(--c-ink); }
.tag--rock   { background-color: rgba(90, 101, 112, 0.6); }

/* ---------- 14. 数据仪表块 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.9rem 0;
  border-block-start: 1px solid rgba(90, 101, 112, 0.45);
}

.stat__value {
  font-family: var(--f-mono);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-signal);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-rock);
}

.stat-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 1rem;
  padding-block: 0.7rem;
  border-block-end: 1px solid rgba(90, 101, 112, 0.3);
  transition: background-color 0.16s var(--ease);
}

.stat-row:hover { background-color: rgba(30, 111, 168, 0.16); }

/* ---------- 15. 媒体容器（页面阶段放 img） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--c-abyss);
  background-image:
    repeating-linear-gradient(120deg, rgba(30, 111, 168, 0.22) 0 1px, transparent 1px 18px),
    linear-gradient(140deg, #123A5C 0%, #0B2239 100%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}

.media:hover > img { transform: scale(1.04); }

.media__veil {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(105deg, rgba(11, 34, 57, 0.72) 0%, rgba(11, 34, 57, 0.1) 55%, rgba(255, 107, 44, 0.16) 100%);
}

.media__caption {
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: 0;
  padding: 0.6rem 0.85rem;
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  color: var(--c-spray);
  background-color: rgba(10, 16, 23, 0.72);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

/* ---------- 16. 通用网格 ---------- */
.grid { display: grid; gap: clamp(0.9rem, 2vw, 1.5rem); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
}

/* ---------- 17. 显现动效 ---------- */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1100px) {
  .footer__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .footer__brand { grid-column: 1 / -1; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  body { padding-inline-start: 0; padding-block-start: var(--top-h); }

  .skip-link { inset-inline-start: 0.75rem; }

  .site-header {
    inset-block: 0 auto;
    inset-inline: 0;
    width: 100%;
    height: var(--top-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-inline: 1rem;
    background-image: linear-gradient(90deg, #0C2540 0%, #081824 100%);
    border-inline-end: 0;
    border-block-end: 1px solid rgba(90, 101, 112, 0.42);
  }

  .brand-mark {
    order: 1;
    flex-direction: row;
    align-items: center;
    gap: 0.6rem;
    padding: 0;
    border-block-end: 0;
  }

  .brand-mark__name {
    writing-mode: horizontal-tb;
    font-size: 1rem;
    letter-spacing: 0.08em;
  }

  .rail-nav,
  .rail-cta,
  .rail-meter { display: none; }

  .nav-toggle {
    order: 2;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.85rem;
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.14em;
    color: var(--c-spray);
    background-color: rgba(30, 111, 168, 0.26);
    transition: background-color 0.18s var(--ease);
    clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  }

  .nav-toggle:hover { background-color: rgba(30, 111, 168, 0.6); }

  .nav-toggle[aria-expanded="true"] {
    background-color: var(--c-signal);
    color: var(--c-ink);
  }

  .nav-toggle__bars {
    width: 16px;
    height: 2px;
    background-color: currentColor;
    box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
  }

  .footer__bar { flex-direction: column; gap: 0.4rem; }
  .footer__meta--copy { margin-inline-start: 0; }
}

@media (min-width: 961px) {
  .drawer,
  .drawer-scrim { display: none; }
}

@media (max-width: 760px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--split { grid-template-columns: minmax(0, 1fr); }

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

  .chapter__title { transform: skewX(-7deg); }
  .display-title { transform: skewX(-6deg); }
}

@media (max-width: 480px) {
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 19. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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

  .footer__pulse { animation: none; opacity: 1; }

  .media:hover > img { transform: none; }
}