/* =========================================================
   盈嘉体育 / Calibrate — 全站共享样式
   设计定位：赛场坐标随时校准
   ========================================================= */

/* ---------- 设计令牌 ---------- */
:root {
  --color-primary: #E63946;
  --color-primary-dark: #C1272D;
  --color-secondary: #1D3557;
  --color-accent: #2A9D8F;
  --color-ink: #0D1B2A;
  --color-paper: #F8F9FA;
  --color-steel: #4A6B8A;
  --color-warning: #F9C74F;
  --color-white: #FFFFFF;

  --font-headline: "Archivo Black", "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Consolas", monospace;

  --content-max: 1280px;
  --content-pad: clamp(20px, 4vw, 48px);
  --radius-sm: 6px;
  --radius-md: 12px;
  --shadow-soft: 0 4px 20px rgba(13, 27, 42, 0.08);
  --shadow-deep: 0 8px 32px rgba(13, 27, 42, 0.2);
  --transition-fast: 160ms ease;
  --transition-base: 260ms ease;
  --header-h: 72px;
}

/* ---------- 重置与基础排版 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-headline);
  line-height: 1.2;
  color: var(--color-ink);
}

h1 { font-size: clamp(2rem, 5vw, 3.375rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.375rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

p { font-size: 1rem; }

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

ul, ol {
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button {
  font-family: inherit;
}

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

[id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

#main-content {
  min-height: 60vh;
  outline: none;
}

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.site-header :focus-visible,
.site-footer :focus-visible {
  outline: 3px solid var(--color-warning);
  outline-offset: 2px;
}

/* ---------- 减少动画偏好 ---------- */
@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;
  }
}

/* =========================================================
   头部 / Header
   ========================================================= */
.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 0 0 8px 8px;
  transition: top var(--transition-fast);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 210;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(13, 27, 42, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px solid rgba(230, 57, 70, 0.85);
  box-shadow: 0 2px 20px rgba(13, 27, 42, 0.16);
}

.header-shell {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* 品牌 */
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-white);
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  background: rgba(230, 57, 70, 0.12);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-accent);
}

.brand-mark::before {
  width: 2px;
  height: 24px;
}

.brand-mark::after {
  width: 24px;
  height: 2px;
}

.brand-mark-dot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
  z-index: 1;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-headline);
  font-size: 1.1875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-white);
}

.brand-slogan {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--color-steel);
  text-transform: uppercase;
  margin-top: 4px;
  white-space: nowrap;
}

/* 主菜单按钮（移动端） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

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

.nav-toggle-lines {
  position: relative;
  display: block;
  width: 20px;
  height: 14px;
}

.nav-toggle-line {
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: top 180ms ease, transform 180ms ease, opacity 180ms ease;
}

.nav-toggle-line:nth-child(1) { top: 0; }
.nav-toggle-line:nth-child(2) { top: 6px; }
.nav-toggle-line:nth-child(3) { top: 12px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

.nav-toggle-text {
  font-size: 0.75rem;
}

/* 命令栏导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 6px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item + .nav-item {
  border-left: 1px solid rgba(255, 255, 255, 0.07);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: #B7C6D8;
  text-decoration: none;
  border-radius: 4px;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.07);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  background: var(--color-primary);
  font-weight: 700;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-steel);
  transition: color var(--transition-fast);
}

.nav-link:hover .nav-index {
  color: var(--color-accent);
}

.nav-link[aria-current="page"] .nav-index {
  color: rgba(255, 255, 255, 0.85);
}

.nav-label {
  display: inline-block;
  line-height: 1.3;
}

/* 实时状态灯 */
.header-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: rgba(42, 157, 143, 0.12);
  border: 1px solid rgba(42, 157, 143, 0.35);
  border-radius: 999px;
  flex-shrink: 0;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-out infinite;
}

.status-text {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 rgba(42, 157, 143, 0.55);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(42, 157, 143, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(42, 157, 143, 0);
  }
}

/* 号召按钮 */
.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
  transition: background var(--transition-fast);
}

.cta-link:hover {
  background: var(--color-primary-dark);
}

.cta-icon,
.cta-arrow {
  font-size: 0.8125rem;
  line-height: 1;
}

.cta-icon {
  opacity: 0.9;
}

.cta-arrow {
  opacity: 0.8;
  font-family: var(--font-mono);
}

.cta-label {
  display: inline-block;
  line-height: 1.2;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 190;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(13, 27, 42, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility 0s linear var(--transition-base);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility 0s;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
}

.back-to-top-icon {
  font-size: 0.9375rem;
  line-height: 1;
}

.back-to-top-text {
  font-size: 0.75rem;
}

/* 移动端头部 */
@media (max-width: 1099px) {
  .nav-toggle {
    display: inline-flex;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px var(--content-pad) 24px;
    background: var(--color-ink);
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    border-bottom: 4px solid var(--color-primary);
    border-radius: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    box-shadow: 0 20px 32px rgba(13, 27, 42, 0.35);
    transition: opacity 200ms ease, transform 200ms ease, visibility 0s linear 200ms;
  }

  .primary-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 200ms ease, transform 200ms ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-item + .nav-item {
    border-left: none;
  }

  .nav-link {
    justify-content: space-between;
    padding: 12px 14px;
    font-size: 0.9375rem;
    border-radius: var(--radius-sm);
  }

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

  .cta-link {
    margin-top: 16px;
    justify-content: center;
    padding: 12px 16px;
  }

  .header-status {
    display: none;
  }

  body.nav-is-open {
    overflow: hidden;
  }

  body.nav-is-open .back-to-top {
    opacity: 0;
    visibility: hidden;
  }
}

/* 桌面窄屏适配 */
@media (max-width: 1280px) {
  .brand-slogan {
    display: none;
  }
}

@media (max-width: 1200px) {
  .header-status {
    padding: 5px 8px;
  }
  .status-text {
    display: none;
  }
}

@media (min-width: 1100px) and (max-width: 1240px) {
  .primary-nav {
    gap: 8px;
    padding: 3px 4px;
  }
  .nav-link {
    padding: 7px 8px;
    font-size: 0.75rem;
  }
}

/* =========================================================
   尾部 / Footer
   ========================================================= */
.site-footer {
  position: relative;
  background-color: var(--color-ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px);
  background-size: 40px 40px;
  color: #C9D4E0;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 70%, var(--color-accent) 70%, var(--color-accent) 100%);
  z-index: 1;
}

.footer-shell {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr;
  gap: 48px;
  padding: 72px 0 48px;
}

.brand-link--footer {
  margin-bottom: 24px;
}

.footer-trust {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #93A8BD;
  max-width: 36ch;
  margin-bottom: 20px;
}

.calibration-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(42, 157, 143, 0.12);
  border: 1px solid rgba(42, 157, 143, 0.35);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.calibration-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-out infinite;
}

.calibration-text {
  display: inline-block;
  line-height: 1.2;
}

.footer-col-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-steel);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-nav-list li {
  margin-bottom: 4px;
}

.footer-link {
  display: inline-block;
  padding: 6px 0;
  color: #B7C6D8;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-white);
  transform: translateX(4px);
}

.footer-contact-list .contact-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-steel);
}

.contact-value {
  font-size: 0.8125rem;
  color: #C9D4E0;
  line-height: 1.6;
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0 28px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
}

.footer-legal .footer-link {
  font-size: 0.8125rem;
  color: #7E94AB;
}

.footer-legal .footer-link:hover {
  color: var(--color-white);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: #7E94AB;
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-left: 10px;
  color: #5B7290;
}

@media (max-width: 899px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 56px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* =========================================================
   公用容器与基础组件
   ========================================================= */
.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--content-pad);
  position: relative;
  z-index: 1;
}

/* 堆叠面板 */
.panel {
  position: relative;
  padding: clamp(64px, 8vw, 112px) 0;
  overflow: hidden;
}

.panel:not(:first-child) {
  border-top: 1px solid rgba(13, 27, 42, 0.06);
}

.panel--paper {
  background: var(--color-paper);
}

.panel--white {
  background: var(--color-white);
}

.panel--dark {
  background: var(--color-ink);
  color: #C9D4E0;
}

.panel--blue {
  background: var(--color-secondary);
  color: #C9D4E0;
}

.panel-head {
  max-width: 720px;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
}

.panel-index {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px 6px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-white);
  background: var(--color-primary);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.panel--dark .panel-index,
.panel--blue .panel-index {
  background: var(--color-accent);
  color: var(--color-ink);
}

.panel-title {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.12;
  color: var(--color-ink);
  margin-top: 16px;
  letter-spacing: 0.01em;
}

.panel--dark .panel-title,
.panel--blue .panel-title {
  color: var(--color-white);
}

.panel-lede {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-steel);
  margin-top: 16px;
  max-width: 640px;
}

.panel--dark .panel-lede,
.panel--blue .panel-lede {
  color: #A9BED1;
}

.panel-body {
  position: relative;
  z-index: 1;
}

/* 坐标网格叠加层 */
.grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(13, 27, 42, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 27, 42, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
}

.panel--dark .grid-lines,
.panel--blue .grid-lines {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
}

/* 图片容器 */
.img-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--color-secondary);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  border-radius: var(--radius-md);
}

.img-frame--wide {
  aspect-ratio: 21 / 9;
}

.img-frame--square {
  aspect-ratio: 1 / 1;
}

.img-frame--portrait {
  aspect-ratio: 4 / 5;
}

.img-frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary) 50%, transparent 50%, transparent 100%);
  z-index: 2;
}

.img-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}

.img-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.45);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  z-index: 1;
}

.img-placeholder::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* 图例组件 */
.coord-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  padding: 16px 20px;
  background: var(--color-white);
  border: 1px solid rgba(13, 27, 42, 0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-steel);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}

.legend-dot--accent {
  background: var(--color-accent);
}

.legend-dot--secondary {
  background: var(--color-secondary);
}

.legend-dot--warning {
  background: var(--color-warning);
}

.legend-text {
  font-size: 0.75rem;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 0.78125rem;
  color: var(--color-steel);
}

.breadcrumb-link {
  color: var(--color-steel);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumb-item + .breadcrumb-item::before {
  content: "//";
  color: var(--color-primary);
  margin: 0 8px;
  font-size: 0.6875rem;
}

.breadcrumb-current {
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 500;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  color: var(--color-white);
  background: var(--color-ink);
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.btn--ghost:hover {
  background: var(--color-ink);
  color: var(--color-white);
}

.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background: #21867A;
  border-color: #21867A;
}

.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* 章节跟随链接 */
[data-gps] {
  position: relative;
}

[data-gps].is-active {
  color: var(--color-primary);
  font-weight: 700;
}

[data-gps].is-active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
}

.chapter-link {
  display: inline-block;
  padding: 4px 0;
  color: var(--color-steel);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.chapter-link:hover {
  color: var(--color-ink);
}

/* 小屏字号微调 */
@media (max-width: 480px) {
  :root {
    --header-h: 64px;
  }
  html {
    font-size: 15px;
  }
  .back-to-top {
    right: 12px;
    bottom: 12px;
    padding: 8px 14px;
  }
}