/* ==========================================================================
   对战平台站 · 共享样式 /assets/site.css
   竞技档案终端 —— 深空黑基底 / 霓虹橙与冷冽青蓝 / 粗边框硬阴影 / 等宽索引
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B0E11;
  --slate: #1A1F24;
  --stratum: #2C343B;
  --orange: #FF6A2A;
  --cyan: #35D6E8;
  --gold: #C9A45C;
  --moss: #6E8B74;
  --clay: #B7664A;
  --bone: #F4EFE6;
  --mist: #A7B0B8;

  --line: rgba(167, 176, 184, 0.22);
  --line-soft: rgba(167, 176, 184, 0.14);
  --line-cyan: rgba(53, 214, 232, 0.34);

  --shell-max: 1280px;
  --gutter: clamp(1.15rem, 4vw, 3.5rem);
  --header-h: 78px;

  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, 0.55);
  --shadow-soft: 0 16px 38px rgba(0, 0, 0, 0.5);

  --font-display: "Helvetica Neue", "Arial Black", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.25, 1);
}

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

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

a { color: var(--cyan); }

ul, ol { margin: 0; padding: 0; }

::selection {
  background: var(--orange);
  color: #140905;
}

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 1px;
  box-shadow: 0 0 0 5px rgba(53, 214, 232, 0.16);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.7em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: 0;
  color: var(--bone);
}

h1 { font-size: clamp(2rem, 5.2vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
h3 { font-size: clamp(1.14rem, 2vw, 1.45rem); }
h4 { font-size: clamp(1rem, 1.5vw, 1.15rem); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong { color: var(--bone); font-weight: 700; }

small { font-size: 0.82em; color: var(--mist); }

code, kbd, samp, time {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}

hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: 2rem 0;
}

@media (min-width: 1280px) {
  body { font-size: 17px; }
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: calc(var(--shell-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: 68ch;
  color: var(--bone);
}

.prose h2,
.prose h3 { margin-top: 1.8em; }

.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.85rem);
  background: linear-gradient(158deg, var(--slate), var(--ink) 82%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
  min-width: 0;
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 3px;
  background: var(--orange);
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 300;
  display: inline-block;
  padding: 0.65rem 1.15rem;
  background: var(--cyan);
  color: #04141a;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--bone);
  outline-offset: 3px;
}

/* ---------- 6. 品牌署名 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  flex: 0 0 auto;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  background: var(--orange);
  color: #120a06;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  box-shadow: inset 0 0 0 1px rgba(11, 14, 17, 0.25);
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 12px;
  height: 12px;
  background: var(--ink);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.brand-mark__og { position: relative; z-index: 1; }

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.18;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.04rem;
  color: var(--bone);
  white-space: nowrap;
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  white-space: nowrap;
}

.brand:hover .brand-mark,
.brand:focus-visible .brand-mark {
  background: #ff8147;
  box-shadow: inset 0 0 0 1px rgba(11, 14, 17, 0.3), 0 0 0 2px rgba(255, 106, 42, 0.3);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--bone);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.2rem;
  border: 1px solid var(--line);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
              box-shadow 0.18s var(--ease), border-color 0.18s var(--ease),
              transform 0.18s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  box-shadow: inset 0 0 0 2px var(--cyan);
}

.btn--primary {
  --btn-bg: var(--orange);
  --btn-fg: #140905;
  border-color: #ff8a57;
  font-weight: 800;
  box-shadow: 0 5px 0 rgba(255, 106, 42, 0.16);
}

.btn--primary:hover {
  --btn-bg: #ff8248;
  box-shadow: 0 8px 22px rgba(255, 106, 42, 0.34);
}

.btn--ghost {
  --btn-bg: rgba(53, 214, 232, 0.08);
  --btn-fg: var(--cyan);
  border-color: rgba(53, 214, 232, 0.45);
}

.btn--ghost:hover {
  --btn-bg: rgba(53, 214, 232, 0.18);
  --btn-fg: #dffdff;
  border-color: rgba(53, 214, 232, 0.7);
}

.btn--quiet {
  --btn-fg: var(--mist);
  border-color: var(--line);
  background: rgba(44, 52, 59, 0.5);
}

.btn--quiet:hover {
  --btn-fg: var(--bone);
  background: rgba(44, 52, 59, 0.85);
  border-color: rgba(167, 176, 184, 0.4);
}

.btn--sm {
  padding: 0.5rem 0.85rem;
  font-size: 0.78rem;
}

/* ---------- 8. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  color: var(--bone);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 14, 17, 0.9) 0%, rgba(11, 14, 17, 0.45) 62%, rgba(11, 14, 17, 0) 100%);
  transition: opacity 0.24s var(--ease);
}

.site-header[data-scrolled="true"]::before { opacity: 0; }

.header-bar {
  position: relative;
  border-bottom: 1px solid transparent;
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease),
              box-shadow 0.24s var(--ease);
}

.site-header[data-scrolled="true"] .header-bar {
  background: rgba(26, 31, 36, 0.96);
  border-bottom-color: var(--line-cyan);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: clamp(0.9rem, 2vw, 2.2rem);
  min-height: var(--header-h);
}

/* 主导航 */
.primary-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.4rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.15rem, 1vw, 1rem);
  list-style: none;
}

.nav-item { min-width: 0; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.42rem;
  padding: 0.55rem 0.5rem;
  color: var(--bone);
  font-size: 0.94rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.nav-label { white-space: nowrap; }

.nav-link::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: 0.26rem;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: #ffffff; }

.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--cyan); }

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--orange); }
.nav-link[aria-current="page"] .nav-index { color: var(--orange); }

.nav-dock { display: none; }

.nav-dock__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.7;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* 右侧工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid rgba(53, 214, 232, 0.42);
  background: rgba(44, 52, 59, 0.55);
  color: var(--bone);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-toggle:hover {
  background: rgba(53, 214, 232, 0.16);
  border-color: rgba(53, 214, 232, 0.72);
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.18s var(--ease);
}

.nav-toggle__bar:nth-child(1) { top: 15px; }
.nav-toggle__bar:nth-child(2) { top: 21px; }
.nav-toggle__bar:nth-child(3) { top: 27px; }

.nav-toggle[aria-expanded="true"] { border-color: var(--orange); color: var(--orange); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.05);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--orange) 0%, #ffb066 42%, var(--cyan) 100%);
  box-shadow: 0 0 12px rgba(53, 214, 232, 0.7);
  transition: width 0.09s linear;
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: linear-gradient(180deg, var(--slate) 0%, var(--ink) 68%);
  color: var(--mist);
  border-top: 1px solid rgba(53, 214, 232, 0.16);
}

.footer-rail {
  height: 4px;
  background: linear-gradient(90deg,
    var(--orange) 0 24%,
    var(--cyan) 24% 48%,
    var(--gold) 48% 62%,
    var(--moss) 62% 80%,
    var(--clay) 80% 100%);
}

.footer-shell { padding-block: clamp(2.4rem, 6vw, 4rem) 1.6rem; }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.72fr) minmax(0, 1.5fr);
  gap: clamp(1.6rem, 4vw, 3.2rem);
  align-items: start;
}

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

.brand--footer { margin-bottom: 0.2rem; }

.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.05rem 0 0.85rem;
  padding: 0.32rem 0.7rem;
  border: 1px solid rgba(201, 164, 92, 0.5);
  background: rgba(201, 164, 92, 0.1);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  line-height: 1.5;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.footer-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--gold);
  transform: rotate(45deg);
}

.footer-note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--mist);
}

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

.footer-title {
  margin: 0 0 0.95rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list {
  list-style: none;
  display: grid;
  gap: 0.5rem;
  font-size: 0.92rem;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.footer-list a::before {
  content: "\203A";
  font-family: var(--font-mono);
  color: var(--orange);
  opacity: 0.75;
  line-height: 1;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--bone);
  transform: translateX(3px);
}

.footer-service {
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.footer-service li { display: grid; gap: 0.16rem; }

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

.footer-value {
  display: block;
  color: var(--bone);
  font-size: 0.94rem;
  line-height: 1.6;
  word-break: break-word;
}

.footer-value--mono {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.25rem;
}

.copy-btn {
  padding: 0.3rem 0.62rem;
  border: 1px solid rgba(53, 214, 232, 0.42);
  background: rgba(53, 214, 232, 0.08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.5;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease);
}

.copy-btn:hover {
  background: rgba(53, 214, 232, 0.2);
  color: #dffdff;
}

.copy-btn[data-copied="true"] {
  color: var(--moss);
  border-color: rgba(110, 139, 116, 0.62);
  background: rgba(110, 139, 116, 0.16);
}

.copy-btn[data-copied="false"] {
  color: var(--clay);
  border-color: rgba(183, 102, 74, 0.62);
  background: rgba(183, 102, 74, 0.16);
}

.footer-hint {
  margin: 1rem 0 0;
  padding-left: 0.7rem;
  border-left: 2px solid rgba(201, 164, 92, 0.42);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 40ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem 1.4rem;
  margin-top: clamp(1.8rem, 4vw, 2.8rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.footer-copy { margin: 0; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  list-style: none;
}

.footer-legal a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--cyan);
  border-bottom-color: rgba(53, 214, 232, 0.5);
}

.footer-icp { margin: 0; white-space: nowrap; }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb li + li::before {
  content: "/";
  color: rgba(167, 176, 184, 0.4);
}

.breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--cyan); }

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

/* ---------- 11. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.22rem 0.6rem;
  border: 1px solid var(--line);
  background: rgba(44, 52, 59, 0.55);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  line-height: 1.6;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--official {
  border-color: rgba(201, 164, 92, 0.55);
  background: rgba(201, 164, 92, 0.1);
  color: var(--gold);
}

.tag--live {
  border-color: rgba(255, 106, 42, 0.55);
  background: rgba(255, 106, 42, 0.1);
  color: var(--orange);
}

.tag--cool {
  border-color: rgba(53, 214, 232, 0.5);
  background: rgba(53, 214, 232, 0.08);
  color: var(--cyan);
}

/* ---------- 12. 图像容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
  background:
    radial-gradient(120% 90% at 16% 6%, rgba(53, 214, 232, 0.18), transparent 56%),
    radial-gradient(110% 88% at 84% 94%, rgba(255, 106, 42, 0.18), transparent 58%),
    linear-gradient(148deg, var(--stratum) 0%, var(--slate) 42%, var(--ink) 100%);
}

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg,
    rgba(11, 14, 17, 0.24) 0 1px,
    rgba(11, 14, 17, 0) 1px 4px);
  opacity: 0.32;
  mix-blend-mode: overlay;
}

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 0.32rem 0.7rem;
  background: rgba(11, 14, 17, 0.82);
  border-top: 1px solid rgba(53, 214, 232, 0.4);
  border-right: 1px solid rgba(53, 214, 232, 0.4);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--1x1  { aspect-ratio: 1 / 1; }
.media-frame--3x4  { aspect-ratio: 3 / 4; }

/* ---------- 13. 入场状态 ---------- */
[data-reveal] { opacity: 1; }

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1024px) {
  :root { --header-h: 66px; }

  body.nav-open { overflow: hidden; }

  .nav-toggle { display: block; }
  .header-cta { display: none; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 0.6rem var(--gutter) 1.5rem;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: linear-gradient(180deg, rgba(26, 31, 36, 0.99) 0%, rgba(11, 14, 17, 0.99) 100%);
    border-top: 1px solid var(--line-soft);
    border-bottom: 1px solid var(--line-cyan);
    box-shadow: 0 22px 42px rgba(0, 0, 0, 0.6);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s var(--ease);
  }

  .primary-nav[data-open="true"] {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-item + .nav-item { border-top: 1px solid var(--line-soft); }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.92rem 0.2rem;
    font-size: 1rem;
  }

  .nav-index { font-size: 0.64rem; }

  .nav-link::after {
    left: 0.2rem;
    right: auto;
    width: 34px;
    bottom: 0.5rem;
  }

  .nav-dock {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin-top: 1.15rem;
    padding-top: 1.15rem;
    border-top: 1px dashed var(--line);
  }

  .nav-dock .btn { width: 100%; }

  .nav-dock__note {
    margin-top: 0.35rem;
    text-align: center;
    letter-spacing: 0.08em;
  }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--service { grid-column: 1 / -1; }
  .footer-badge { margin-top: 0.9rem; }
}

@media (max-width: 640px) {
  .brand-meta { letter-spacing: 0.12em; }
  .brand-name { font-size: 0.98rem; }
  .brand-mark { width: 38px; height: 38px; font-size: 0.92rem; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-col--service { grid-column: auto; }
  .footer-hint { max-width: none; }
  .media-frame--21x9 { aspect-ratio: 16 / 9; }
}

/* ---------- 15. 降低动效 ---------- */
@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;
  }

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

  .btn:hover,
  .footer-list a:hover { transform: none; }
}