/* ============================================================
   博奥体育 · 共享样式表 /assets/site.css
   结构：变量 → reset → 排版 → 外壳组件 → 头尾 → 通用组件 → 响应式
   ============================================================ */

:root {
  /* 品牌原色 */
  --ink: #0A211C;
  --ink-2: #12332B;
  --moss: #1C4A3C;
  --paper: #F5F2EA;
  --orange: #FF6A1F;
  --amber: #E9A93C;
  --cyan: #2E9CB5;
  --cyan-deep: #1B6C86;
  --wine: #7C2C3B;
  --sage: #93A79F;

  /* 语义映射（暗场） */
  --bg: #0A211C;
  --surface: #12332B;
  --surface-2: #1C4A3C;
  --line: #1C4A3C;
  --line-strong: #6E8A80;
  --text: #F5F2EA;
  --muted: #93A79F;
  --accent: #FF6A1F;
  --accent-ink: #0A211C;
  --gold: #E9A93C;
  --link: #2E9CB5;
  --stripe: rgba(245, 242, 234, 0.05);
  --shadow: 6px 6px 0 0 rgba(0, 0, 0, 0.55);
  --shadow-soft: 4px 4px 0 0 rgba(0, 0, 0, 0.35);

  /* 字体 */
  --font-display: "Helvetica Neue Condensed", "Arial Narrow", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Menlo", "Consolas", "Roboto Mono", monospace;

  /* 1.25 模块化字阶 */
  --t--1: 0.78rem;
  --t0: 1rem;
  --t1: 1.25rem;
  --t2: 1.5625rem;
  --t3: 1.953rem;
  --t4: 2.441rem;
  --t5: 3.05rem;

  --shell: 1180px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* 明场（灯光切换） */
:root[data-theme="lamp"] {
  --bg: #EFE8DA;
  --surface: #F7F2E7;
  --surface-2: #E3DAC7;
  --line: #B9AE97;
  --line-strong: #0A211C;
  --text: #0A211C;
  --muted: #4B5B54;
  --link: #1B6C86;
  --stripe: rgba(10, 33, 28, 0.06);
  --shadow: 6px 6px 0 0 rgba(10, 33, 28, 0.18);
  --shadow-soft: 4px 4px 0 0 rgba(10, 33, 28, 0.14);
}

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

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

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

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

[hidden] { display: none !important; }

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

a { color: inherit; }

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

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

/* ---------------- 基础排版 ---------------- */
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.6rem); line-height: 1.05; }
h2 { font-size: var(--t3); }
h3 { font-size: var(--t1); }
h4 { font-size: var(--t0); }

p { max-width: 38em; }

strong { font-weight: 800; }

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

/* ---------------- 外壳 ---------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

#main-content { display: block; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background: var(--orange);
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: top 0.18s var(--ease);
}

.skip-link:focus { top: 0.75rem; }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 120;
  background: rgba(147, 167, 159, 0.18);
  pointer-events: none;
}

.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* ---------------- 头部 ---------------- */
.site-header {
  position: relative;
  z-index: 40;
  background: var(--bg);
}

.utility-bar {
  background: #0A211C;
  color: #F5F2EA;
  border-bottom: 2px solid #1C4A3C;
  font-size: var(--t--1);
  letter-spacing: 0.1em;
}

.utility-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.55rem;
}

.season-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  max-width: none;
  font-weight: 700;
  color: #93A79F;
}

.season-badge__dot {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 31, 0.22);
}

.utility-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lamp-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.65rem;
  border: 2px solid #2C5445;
  color: #C9D6D0;
  font-size: var(--t--1);
  font-weight: 800;
  letter-spacing: 0.08em;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease),
    background-color 0.16s var(--ease);
}

.lamp-toggle:hover {
  border-color: var(--amber);
  color: var(--amber);
}

.lamp-toggle__dot {
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--cyan);
  transition: background-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.lamp-toggle[aria-pressed="true"] .lamp-toggle__dot {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(233, 169, 60, 0.28);
}

.lamp-toggle__label { white-space: nowrap; }

/* 刊头 */
.masthead {
  position: relative;
  border-bottom: 2px solid var(--line);
}

.masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    90deg,
    var(--stripe) 0 2px,
    transparent 2px 10px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 28%, #000 72%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 28%, #000 72%, transparent);
}

.masthead__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-block: clamp(1rem, 3vw, 1.9rem);
}

.masthead__kicker,
.masthead__tagline {
  max-width: none;
  font-size: var(--t--1);
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--muted);
  line-height: 1.5;
}

.masthead__kicker { justify-self: start; }
.masthead__tagline { justify-self: end; text-align: right; }

.masthead__brand {
  justify-self: center;
  position: relative;
  padding-bottom: 0.55rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

.masthead__brand::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 56px;
  height: 3px;
  transform: translateX(-50%);
  background: var(--accent);
  transition: width 0.18s var(--ease);
}

.masthead__brand:hover { color: var(--amber); }
.masthead__brand:hover::after { width: 92px; }

/* 栏目轨道 */
.tracks {
  background: var(--surface);
  border-bottom: 2px solid var(--line);
}

.tracks__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding-block: 0.45rem;
}

.nav-stack {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  min-width: 0;
}

.nav-track {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.nav-track > li > a,
.nav-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border: 2px solid transparent;
  color: var(--muted);
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s var(--ease), background-color 0.16s var(--ease),
    border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.nav-track > li > a:hover,
.nav-more:hover {
  color: #F5F2EA;
  background: linear-gradient(180deg, var(--cyan), var(--cyan-deep));
  border-color: var(--cyan-deep);
  transform: translateY(-2px);
}

.nav-track > li > a[aria-current="page"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 900;
}

.nav-track > li > a[aria-current="page"]:hover {
  background: var(--accent);
  color: var(--accent-ink);
  transform: none;
}

.nav-track__more { display: flex; }

.nav-more__caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  transition: transform 0.18s var(--ease);
}

.nav-more[aria-expanded="true"] .nav-more__caret { transform: rotate(180deg); }

.nav-extra {
  position: absolute;
  top: calc(100% + 0.4rem);
  left: 50%;
  z-index: 60;
  display: flex;
  gap: 1.1rem;
  padding: 0.6rem 1rem;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--cyan), var(--cyan-deep));
  border: 2px solid var(--line-strong);
  box-shadow: var(--shadow);
}

.nav-extra a {
  color: #F5F2EA;
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 1px;
  white-space: nowrap;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.nav-extra a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.9rem;
  border: 2px solid var(--line);
  background: var(--surface-2);
  color: var(--text);
  font-size: var(--t--1);
  font-weight: 800;
  letter-spacing: 0.14em;
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

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

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

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

/* ---------------- 页脚 ---------------- */
.site-footer {
  --text: #F5F2EA;
  --muted: #93A79F;
  --line: #1C4A3C;
  --line-strong: #3A6B5C;
  --surface: #12332B;
  --surface-2: #1C4A3C;
  --shadow: 6px 6px 0 0 rgba(0, 0, 0, 0.45);
  margin-top: clamp(3rem, 8vw, 6rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem) 1.5rem;
  background: #0A211C;
  color: #F5F2EA;
  border-top: 6px solid #1C4A3C;
}

.footer-lede {
  display: grid;
  gap: 0.5rem;
  padding-bottom: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: clamp(1.5rem, 4vw, 2.2rem);
  border-bottom: 2px solid #24473D;
}

.footer-lede__brand {
  max-width: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.footer-lede__closing {
  max-width: none;
  font-size: var(--t1);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.7fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
}

.footer-col__title {
  position: relative;
  margin-bottom: 0.9rem;
  padding-left: 0.85rem;
  font-family: var(--font-body);
  font-size: var(--t--1);
  font-weight: 800;
  letter-spacing: 0.16em;
  color: #93A79F;
  line-height: 1.6;
}

.footer-col__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 9px;
  height: 9px;
  background: var(--orange);
  transform: rotate(8deg);
}

.footer-col ul { display: grid; gap: 0.55rem; }

.footer-col a {
  color: #F5F2EA;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 1px;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.footer-col a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.footer-contact {
  padding: clamp(1rem, 2.5vw, 1.35rem);
  background: #12332B;
  border: 2px solid #2A5548;
  box-shadow: var(--shadow);
}

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  align-items: baseline;
  max-width: none;
  font-size: 0.875rem;
  line-height: 1.7;
  padding-block: 0.35rem;
  border-bottom: 1px dashed #2A5548;
}

.footer-contact__row:last-of-type { border-bottom: 0; }

.footer-contact__key {
  flex: none;
  width: 3.2em;
  font-size: var(--t--1);
  letter-spacing: 0.14em;
  color: #93A79F;
}

.footer-contact__val {
  color: #F5F2EA;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.copy-mail {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2rem 0.5rem;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--amber);
  text-align: left;
  border-bottom: 2px solid transparent;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.copy-mail:hover { border-bottom-color: var(--amber); }

.copy-mail__text { word-break: break-all; }

.copy-mail__hint {
  font-family: var(--font-body);
  font-size: var(--t--1);
  letter-spacing: 0.1em;
  color: #93A79F;
}

.footer-contact__note {
  max-width: none;
  margin-top: 0.75rem;
  font-size: var(--t--1);
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: #93A79F;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  padding-top: 1.25rem;
  border-top: 2px solid #24473D;
  font-size: var(--t--1);
  letter-spacing: 0.08em;
  color: #93A79F;
}

.footer-base p { max-width: none; }
.footer-base__icp { font-family: var(--font-mono); }

/* ---------------- 通用按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  border: 2px solid currentColor;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-decoration: none;
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease),
    background-color 0.16s var(--ease), color 0.16s var(--ease),
    border-color 0.16s var(--ease);
}

.btn--signal {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  box-shadow: var(--shadow-soft);
}

.btn--signal:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 rgba(0, 0, 0, 0.45);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}

.btn--ghost:hover {
  transform: translate(-2px, -2px);
  border-color: var(--amber);
  color: var(--amber);
  box-shadow: var(--shadow-soft);
}

.btn--sm {
  padding: 0.32rem 0.7rem;
  font-size: var(--t--1);
  letter-spacing: 0.1em;
}

/* ---------------- 面包屑 ---------------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 1.25rem;
  font-size: var(--t--1);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid var(--line);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.crumbs a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.crumbs [aria-current="page"] { color: var(--text); font-weight: 700; }

.crumbs__sep { color: var(--line-strong); }

/* ---------------- 正文容器 ---------------- */
.prose { max-width: 38em; }

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: var(--t2);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: var(--t1);
}

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

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

.prose ul li {
  position: relative;
  padding-left: 1.3em;
}

.prose ul li + li { margin-top: 0.5em; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--amber);
  transform: rotate(8deg);
}

/* ---------------- 栅格 ---------------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

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

/* ---------------- 面板 ---------------- */
.panel {
  padding: clamp(1.1rem, 3vw, 1.75rem);
  background: var(--surface);
  border: 2px solid var(--line);
  box-shadow: var(--shadow);
}

.panel--flush { padding: 0; }

.panel--wine {
  background: var(--wine);
  border-color: #9E4657;
  color: #F5F2EA;
}

.panel--wine .panel__meta,
.panel--wine .kicker { color: #F2C8CF; }

/* ---------------- 标签与标题行 ---------------- */
.kicker {
  display: inline-block;
  font-size: var(--t--1);
  font-weight: 800;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.6rem;
  border: 2px solid currentColor;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--gold);
}

.tag--cyan { color: var(--link); }

.tag--solid {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-bottom: 0.9rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--line);
}

.section-head__title {
  font-size: var(--t2);
  line-height: 1.15;
}

.section-head__meta {
  max-width: none;
  font-size: var(--t--1);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------------- 色带断点 ---------------- */
.rule {
  height: 10px;
  border-block: 2px solid var(--line);
  background: repeating-linear-gradient(
    135deg,
    var(--orange) 0 10px,
    var(--wine) 10px 20px
  );
}

/* ---------------- 门牌编号 ---------------- */
.figure-number {
  display: inline-grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  flex: none;
  background: var(--moss);
  border: 2px solid var(--line-strong);
  color: #F5F2EA;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
}

/* ---------------- 统计数字 ---------------- */
.stat { display: block; }

.stat__value {
  display: inline-block;
  padding-inline: 0.12em;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.stat__label {
  display: block;
  margin-top: 0.4rem;
  font-size: var(--t--1);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--muted);
}

/* ---------------- 图片容器基础规则 ---------------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 2px solid var(--line);
  background: var(--surface-2);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(155deg, rgba(27, 108, 134, 0.42), rgba(124, 44, 59, 0.42));
  mix-blend-mode: soft-light;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }

.media--skew { clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%); }

.media__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  text-align: center;
  font-size: var(--t--1);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.media__cap {
  display: block;
  margin-top: 0.6rem;
  font-size: var(--t--1);
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .masthead__inner {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 0.35rem;
    padding-block: 1.1rem 1.4rem;
  }

  .masthead__kicker,
  .masthead__tagline {
    justify-self: center;
    text-align: center;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
  }

  .masthead__tagline { order: 3; }

  .tracks__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.55rem;
    padding-block: 0.7rem;
  }

  .nav-toggle {
    display: inline-flex;
    align-self: flex-start;
  }

  .nav-stack {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .nav-stack[data-open] { display: flex; }

  .nav-track {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.35rem;
    scrollbar-width: thin;
  }

  .nav-track > li > a { padding: 0.5rem 0.75rem; }

  .nav-extra {
    position: static;
    transform: none;
    flex-direction: column;
    gap: 0.55rem;
    padding: 0.65rem 0.75rem;
    box-shadow: none;
    border-width: 0 0 0 3px;
    border-style: solid;
    border-color: var(--cyan);
  }

  .grid--halves,
  .grid--thirds { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .utility-bar__inner {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .utility-actions { gap: 0.5rem; margin-left: auto; }

  .season-badge { font-size: 0.72rem; letter-spacing: 0.08em; }

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

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

  .footer-contact__key { width: 2.9em; }
}

@media (max-width: 420px) {
  .masthead__tagline { display: none; }
  .copy-mail__hint { flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .btn--signal:hover,
  .btn--ghost:hover,
  .nav-track > li > a:hover,
  .nav-more:hover { transform: none; }
}