/* ============================================================
   博鱼赛场 — /assets/site.css
   深夜观赛室 · 战术板与数据流
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ol, ul {
  margin: 0;
}

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

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

button { font: inherit; color: inherit; }

a { color: inherit; }

table { border-collapse: collapse; border-spacing: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --ink-950: #04070F;
  --ink-900: #060B16;   /* 深海黑蓝 · 底层 */
  --ink-850: #0A1220;
  --ink-800: #0E1A2B;   /* 观赛室靛 */
  --ink-700: #16233A;   /* 深潜蓝 */

  --sonar:      #21E6D0;  /* 声呐青 */
  --sonar-soft: #9BF4EA;  /* 浅藻青 */
  --coral:      #FF6B3D;  /* 珊瑚橙 */
  --lime:       #B8FF3C;  /* 荧光柠青 */
  --stone:      #5C6A76;  /* 岩灰 */
  --moss:       #4E7A63;  /* 苔绿 */
  --paper:      #F2EFE6;  /* 米白 */

  /* 派生 */
  --line:       rgba(92, 106, 118, .26);
  --line-sonar: rgba(33, 230, 208, .22);
  --text:       rgba(242, 239, 230, .78);
  --text-strong:#F2EFE6;
  --text-dim:   rgba(242, 239, 230, .52);
  --text-mute:  rgba(242, 239, 230, .38);

  --sonar-06: rgba(33, 230, 208, .06);
  --sonar-08: rgba(33, 230, 208, .08);
  --sonar-14: rgba(33, 230, 208, .14);
  --coral-14: rgba(255, 107, 61, .14);
  --lime-16:  rgba(184, 255, 60, .16);

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system,
               "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", "SF Mono",
               SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* 尺度 */
  --wrap: 1280px;
  --gutter: 2.5rem;
  --gap: 2rem;
  --radius: 2px;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 220ms;
}

/* ---------- 3. 基础排版（中文优先） ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.78;
  letter-spacing: .012em;
  color: var(--text);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(115% 78% at 88% -12%, rgba(33, 230, 208, .10), transparent 58%),
    radial-gradient(90% 60% at 4% 8%, rgba(255, 107, 61, .07), transparent 62%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-strong);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.012em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

a {
  color: var(--sonar-soft);
  text-decoration-color: rgba(33, 230, 208, .38);
  text-underline-offset: .24em;
  transition: color var(--dur) var(--ease), text-decoration-color var(--dur) var(--ease);
}

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

strong, b { font-weight: 600; color: var(--text-strong); }

::selection {
  background: var(--sonar);
  color: var(--ink-950);
}

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

/* 字阶 */
.t-hero {
  font-size: clamp(56px, 9vw, 168px);
  font-weight: 800;
  font-stretch: 87%;
  letter-spacing: -.038em;
  line-height: .86;
  color: var(--text-strong);
}

.t-display {
  font-size: clamp(40px, 5.4vw, 84px);
  font-weight: 800;
  font-stretch: 90%;
  letter-spacing: -.032em;
  line-height: .94;
}

.t-section {
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 700;
  letter-spacing: -.018em;
  line-height: 1.14;
}

.t-sub {
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 600;
  line-height: 1.4;
}

.t-body { font-size: 17px; line-height: 1.78; }
.t-small { font-size: 14px; line-height: 1.7; }

.t-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--sonar);
  opacity: .7;
}

.lede {
  font-size: clamp(19px, 1.9vw, 23px);
  line-height: 1.66;
  color: var(--text);
  max-width: 62ch;
}

.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.1em; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-weight: 600;
  text-decoration: none;
}

.link-arrow::after {
  content: "→";
  font-family: var(--font-mono);
  transition: transform var(--dur) var(--ease);
}

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

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: min(var(--wrap), calc(100% - var(--gutter)));
  margin-inline: auto;
}

.section { padding-block: 6rem; }
.section--tight { padding-block: 3rem; }

.section + .section { padding-top: 0; }

.stack > * + * { margin-top: 1rem; }

.grid {
  display: grid;
  gap: var(--gap);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.col-span-3  { grid-column: span 3; }
.col-span-4  { grid-column: span 4; }
.col-span-5  { grid-column: span 5; }
.col-span-6  { grid-column: span 6; }
.col-span-7  { grid-column: span 7; }
.col-span-8  { grid-column: span 8; }
.col-span-9  { grid-column: span 9; }
.col-span-12 { grid-column: span 12; }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-sonar), rgba(92, 106, 118, .12) 60%, transparent);
}

/* ---------- 5. 面板与状态 ---------- */
.panel {
  background: var(--ink-800);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 2.6vw, 2.4rem);
}

.panel--glass {
  background: linear-gradient(160deg, rgba(14, 26, 43, .82), rgba(6, 11, 22, .58));
  backdrop-filter: blur(6px) saturate(120%);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--sonar-soft);
  white-space: nowrap;
}

.status-pill::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--sonar);
  box-shadow: 0 0 0 3px rgba(33, 230, 208, .16);
  animation: sonarBlink 2.6s var(--ease) infinite;
}

@keyframes sonarBlink {
  0%, 100% { box-shadow: 0 0 0 3px rgba(33, 230, 208, .16); }
  50%      { box-shadow: 0 0 0 6px rgba(33, 230, 208, .05); }
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .22rem .58rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--sonar-soft);
  background: var(--sonar-08);
  border-radius: var(--radius);
  white-space: nowrap;
}

.tag--coral { color: #FFD3C5; background: var(--coral-14); }
.tag--lime  { color: #E4FFB2; background: var(--lime-16); }
.tag--stone { color: rgba(242, 239, 230, .62); background: rgba(92, 106, 118, .2); }

.stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--text-strong);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--stone);
}

.stat__delta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--lime);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .74rem 1.2rem;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  background: transparent;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

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

.btn--primary {
  background: var(--coral);
  color: #1A0A04;
}

.btn--primary:hover {
  background: #FF8459;
  color: #1A0A04;
}

.btn--ghost {
  border-color: rgba(33, 230, 208, .4);
  color: var(--sonar-soft);
}

.btn--ghost:hover {
  border-color: var(--sonar);
  background: var(--sonar-08);
  color: var(--text-strong);
}

.btn--sm {
  padding: .48rem .8rem;
  font-size: 13px;
  letter-spacing: .01em;
}

.btn--block {
  width: 100%;
}

/* ---------- 7. 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .35rem;
}

.crumbs li {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
}

.crumbs li + li::before {
  content: "/";
  color: rgba(92, 106, 118, .7);
}

.crumbs a {
  color: var(--text-dim);
  text-decoration: none;
}

.crumbs a:hover { color: var(--sonar); }

.crumbs [aria-current="page"] { color: var(--sonar-soft); }

/* ---------- 8. 分段 / 标签页 ---------- */
.seg {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem;
  border-bottom: 1px solid var(--line);
}

.seg-btn {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: .62rem .95rem;
  margin-bottom: -1px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--text-dim);
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.seg-btn:hover { color: var(--text-strong); background: var(--sonar-06); }

.seg-btn[aria-selected="true"] {
  color: var(--sonar);
  border-bottom-color: var(--sonar);
}

.seg-panel { padding-top: 1.6rem; }

.seg-panel[hidden] { display: none; }

.seg-panel.is-entering {
  animation: segIn var(--dur) var(--ease) both;
}

@keyframes segIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

/* ---------- 9. 图片容器（页面阶段放占位素材） ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--ink-800);
  isolation: isolate;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(6, 11, 22, .12), rgba(6, 11, 22, .58)),
    linear-gradient(115deg, rgba(33, 230, 208, .12), transparent 52%, rgba(255, 107, 61, .12));
  mix-blend-mode: screen;
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.78) contrast(1.06);
}

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

.media__caption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-mute);
}

/* ---------- 10. 数据表 ---------- */
.data-table {
  width: 100%;
  font-size: 15px;
}

.data-table th,
.data-table td {
  padding: .72rem .85rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: baseline;
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--stone);
  border-bottom-color: var(--line-sonar);
}

.data-table tbody tr { transition: background-color var(--dur) var(--ease); }
.data-table tbody tr:hover { background: var(--sonar-06); }

.data-table .is-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* ---------- 11. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 200;
  padding: .7rem 1.1rem;
  background: var(--sonar);
  color: var(--ink-950);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: .8rem;
  color: var(--ink-950);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6, 11, 22, .95);
  border-bottom: 1px solid rgba(33, 230, 208, .16);
  color: var(--text-strong);
}

@supports (backdrop-filter: blur(4px)) {
  .site-header {
    background: rgba(6, 11, 22, .82);
    backdrop-filter: blur(12px) saturate(130%);
  }
}

.header-scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, transparent 0%, rgba(33, 230, 208, .07) 46%, rgba(33, 230, 208, .02) 54%, transparent 70%);
  animation: headerScan 11s linear infinite;
}

@keyframes headerScan {
  from { transform: translateX(-72%); }
  to   { transform: translateX(72%); }
}

.header-top {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: .9rem 1.5rem;
  padding-block: .82rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .72rem;
  text-decoration: none;
  color: var(--text-strong);
  flex: none;
}

.brand:hover { color: var(--text-strong); }

.brand-glyph {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.5px solid rgba(33, 230, 208, .72);
}

.brand-glyph::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 12px rgba(255, 107, 61, .55);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .16em;
  color: inherit;
}

.brand-tag {
  margin-top: 4px;
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--stone);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .75rem;
}

.season-chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--text-dim);
  padding: .3rem .55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .46rem .62rem;
  background: transparent;
  border: 1px solid var(--line-sonar);
  border-radius: var(--radius);
  color: var(--sonar-soft);
  font-size: 12.5px;
  letter-spacing: .16em;
  cursor: pointer;
}

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

.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-icon i {
  display: block;
  height: 1.5px;
  width: 100%;
  background: currentColor;
  font-style: normal;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle.is-open .nav-toggle-icon i:first-child { transform: translateY(2.75px) rotate(45deg); }
.nav-toggle.is-open .nav-toggle-icon i:last-child  { transform: translateY(-2.75px) rotate(-45deg); }

.nav-toggle-label { line-height: 1; }

.header-bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(92, 106, 118, .2);
}

.cmd-nav { position: relative; }

.cmd-list {
  display: flex;
  align-items: stretch;
  gap: .1rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.cmd-list::-webkit-scrollbar { display: none; }

.cmd-item { flex: none; }

.cmd-link {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .62rem .82rem;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.cmd-link:hover {
  color: var(--text-strong);
  background: var(--sonar-06);
}

.cmd-index {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--stone);
  transition: color var(--dur) var(--ease);
}

.cmd-link:hover .cmd-index { color: var(--sonar-soft); }

.cmd-link[aria-current="page"] {
  color: var(--sonar);
  border-bottom-color: var(--sonar);
  background: var(--sonar-06);
}

.cmd-link[aria-current="page"] .cmd-index { color: var(--sonar-soft); }

.cmd-label { line-height: 1.5; }

.scroll-rail {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--sonar), var(--coral) 70%, var(--lime));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 6rem;
  padding-top: 3.6rem;
  background: linear-gradient(180deg, var(--ink-850), var(--ink-950));
  color: var(--text-dim);
  overflow: hidden;
}

.footer-edge {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sonar), var(--coral) 58%, var(--lime));
  transform: skewY(-.55deg);
  transform-origin: left top;
}

.footer-wave {
  position: absolute;
  top: -40px;
  right: -60px;
  width: 460px;
  height: 460px;
  pointer-events: none;
  background:
    repeating-radial-gradient(circle at center,
      rgba(33, 230, 208, .09) 0 1px,
      transparent 1px 34px);
  mask-image: radial-gradient(circle at center, #000 18%, transparent 66%);
  -webkit-mask-image: radial-gradient(circle at center, #000 18%, transparent 66%);
  opacity: .8;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr 2.1fr 1.45fr;
  gap: 2.6rem 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(92, 106, 118, .24);
}

.brand--footer .brand-name { font-size: 18px; }

.footer-lede {
  margin-top: 1.1rem;
  max-width: 30ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.footer-status {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--moss);
}

.footer-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--moss);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.6rem;
}

.footer-title {
  margin-bottom: .95rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--sonar-soft);
}

.footer-links { display: flex; flex-direction: column; gap: .55rem; }

.footer-links a {
  font-size: 14.5px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-links a:hover {
  color: var(--sonar);
  padding-left: 4px;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: .62rem;
  font-size: 13.5px;
}

.contact-list li {
  display: grid;
  grid-template-columns: 5.2em minmax(0, 1fr);
  gap: .6rem;
  align-items: baseline;
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--stone);
}

.contact-val {
  color: var(--text);
  word-break: break-word;
}

.footer-note {
  margin-top: 1rem;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-mute);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem 1.4rem;
  padding-block: 1.3rem 2.2rem;
  font-size: 12.5px;
  color: var(--text-mute);
}

.footer-copy { font-family: var(--font-mono); letter-spacing: .03em; }

.footer-legal {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
}

.footer-legal a {
  color: var(--text-dim);
  text-decoration: none;
}

.footer-legal a:hover { color: var(--sonar); }

.footer-legal span { color: rgba(92, 106, 118, .8); }

.footer-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: var(--stone);
}

/* ---------- 13. 进场显现 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1024px) {
  :root { --gutter: 2rem; --gap: 1.6rem; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid--12 > * { grid-column: span 6; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .header-bottom { border-top-color: rgba(92, 106, 118, .16); }

  .cmd-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    background: var(--ink-800);
    border-bottom: 1px solid var(--line-sonar);
    box-shadow: 0 24px 48px rgba(4, 7, 15, .6);
  }

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

  .cmd-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: .4rem 0 .8rem;
  }

  .cmd-link {
    padding: .95rem 1.25rem;
    font-size: 16px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .cmd-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--sonar);
    background: var(--sonar-08);
  }

  .cmd-index { font-size: 11.5px; }

  .season-chip { display: none; }

  .section { padding-block: 4.2rem; }
}

@media (max-width: 720px) {
  :root { --gutter: 1.6rem; }

  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .brand-tag { display: none; }
  .brand-name { font-size: 17px; letter-spacing: .12em; }

  .t-hero { letter-spacing: -.028em; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-icp { margin-left: 0; }
}

@media (max-width: 640px) {
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 > * { grid-column: span 1; }

  .status-pill { display: none; }

  .contact-list li { grid-template-columns: minmax(0, 1fr); gap: .1rem; }

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

  .seg { overflow-x: auto; flex-wrap: nowrap; }
  .seg-btn { white-space: nowrap; }
}

@media (max-width: 460px) {
  .header-actions .btn { padding: .44rem .62rem; font-size: 12px; }
  .nav-toggle-label { display: none; }
}

/* ---------- 15. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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

  .scroll-rail { transition: none; }
}