*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-night: #0B1A2A;
  --color-snow: #F7F3EB;
  --color-lake: #3A7CA5;
  --color-flame: #E8612A;
  --color-grass: #2F9E63;
  --color-rock: #6A7A88;
  --color-clay: #B56A45;
  --color-banner: #D7B16A;
  --color-moss: #4F6F52;
  --font-display: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'Sarasa Mono SC', 'Courier New', monospace;
  --radius: 24px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --rail-width: 112px;
  --content-max: 1200px;
  --ease: 150ms ease;
  --ease-long: 300ms ease;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-snow);
  background: var(--color-night);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  line-height: 1.15;
  font-weight: 700;
  color: var(--color-snow);
  margin-bottom: 0.6em;
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.15rem; }

p {
  margin-bottom: 1em;
}

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

a:hover {
  color: var(--color-flame);
}

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

address {
  font-style: normal;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.4em;
}

::selection {
  background: var(--color-flame);
  color: var(--color-snow);
}

:focus-visible {
  outline: 2px solid var(--color-banner);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== 跳转链接 ===== */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 2200;
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--color-flame);
  color: var(--color-snow);
  font-size: 0.85rem;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(232, 97, 42, 0.4);
  transition: top var(--ease);
}

.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--color-banner);
  outline-offset: 2px;
}

/* ===== 滚动进度 ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-flame), var(--color-banner));
  z-index: 2100;
  pointer-events: none;
  transition: width 80ms linear;
}

/* ===== 正文容器 ===== */
.main-content {
  display: block;
  min-height: 60vh;
  background: var(--color-night);
}

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 40px);
}

/* ===== 框架导航 ===== */
.site-header {
  position: relative;
}

.frame-panel {
  position: fixed;
  top: 0;
  bottom: 0;
  z-index: 1200;
  display: flex;
  flex-direction: column;
  align-items: center;
  background:
    linear-gradient(180deg, rgba(215, 177, 106, 0.05), transparent 30%),
    var(--color-night);
}

.frame-panel--left {
  left: 0;
  width: var(--rail-width);
  justify-content: flex-start;
  gap: 20px;
  padding: 24px 10px 18px;
  border-right: 1px solid rgba(106, 122, 136, 0.25);
}

.frame-panel--right {
  right: 0;
  width: var(--rail-width);
  justify-content: flex-end;
  padding: 24px 10px 32px;
  border-left: 1px solid rgba(106, 122, 136, 0.25);
}

.frame-panel--right::before {
  content: '';
  position: absolute;
  top: 24px;
  left: 50%;
  width: 1px;
  height: 56px;
  background: linear-gradient(180deg, transparent, rgba(215, 177, 106, 0.45));
  transform: translateX(-50%);
}

/* ===== 品牌 ===== */
.frame-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.frame-brand__mark {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--color-flame), #b74a2a);
  color: var(--color-snow);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  box-shadow: 0 4px 18px rgba(232, 97, 42, 0.35);
  transition: transform var(--ease);
}

.frame-brand:hover .frame-brand__mark {
  transform: rotate(6deg);
}

.frame-brand__text {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.frame-brand__name {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-snow);
  writing-mode: vertical-rl;
  text-orientation: upright;
  white-space: nowrap;
}

.frame-brand__tagline {
  font-size: 0.56rem;
  color: var(--color-rock);
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
  text-orientation: upright;
  white-space: nowrap;
}

/* ===== 移动导航开关 ===== */
.nav-toggle {
  display: none;
  align-items: center;
  flex-direction: column;
  gap: 2px;
  padding: 7px 13px;
  background: transparent;
  border: 1px solid rgba(106, 122, 136, 0.4);
  border-radius: var(--radius-pill);
  color: var(--color-snow);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.nav-toggle__bars i {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-snow);
  transition: background var(--ease), transform var(--ease);
}

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

.nav-toggle:hover .nav-toggle__bars i {
  background: var(--color-flame);
}

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

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

/* ===== 主导航 ===== */
.site-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 100%;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: calc(100% - 6px);
  min-height: 38px;
  padding: 5px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: rgba(58, 124, 165, 0.08);
  color: var(--color-snow);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: all var(--ease);
}

.site-nav__link::before {
  content: '';
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1.5px solid var(--color-rock);
  transition: all var(--ease);
}

.site-nav__link:hover {
  color: var(--color-flame);
  border-color: rgba(232, 97, 42, 0.45);
  background: rgba(232, 97, 42, 0.06);
  box-shadow: 0 0 12px rgba(232, 97, 42, 0.08);
}

.site-nav__link:hover::before {
  border-color: var(--color-flame);
  border-top-color: transparent;
  transform: rotate(30deg);
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(135deg, var(--color-flame), #cf3e1f);
  color: var(--color-snow);
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(232, 97, 42, 0.25);
}

.site-nav__link[aria-current="page"]::before {
  border-color: var(--color-snow);
  background: var(--color-snow);
}

/* ===== 框架装饰纹样 ===== */
.frame-panel__pattern {
  margin-top: auto;
  width: 36px;
  height: 56px;
  opacity: 0.5;
  border-radius: 6px;
  background-image:
    linear-gradient(45deg, transparent 40%, rgba(215, 177, 106, 0.8) 40%, rgba(215, 177, 106, 0.8) 60%, transparent 60%),
    linear-gradient(-45deg, transparent 40%, rgba(215, 177, 106, 0.8) 40%, rgba(215, 177, 106, 0.8) 60%, transparent 60%);
  background-size: 18px 18px;
}

/* ===== 右侧联系入口 ===== */
.frame-contact {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px 12px;
  writing-mode: vertical-rl;
  text-orientation: upright;
  border: 1px solid rgba(232, 97, 42, 0.4);
  border-radius: var(--radius-pill);
  background: rgba(232, 97, 42, 0.06);
  color: var(--color-flame);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-decoration: none;
  transition: all var(--ease);
}

.frame-contact__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-grass);
  animation: pulse-dot 1.8s infinite;
}

.frame-contact:hover {
  background: var(--color-flame);
  color: var(--color-snow);
  box-shadow: 0 4px 18px rgba(232, 97, 42, 0.3);
}

@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(47, 158, 99, 0.5); }
  70%  { box-shadow: 0 0 0 8px rgba(47, 158, 99, 0); }
  100% { box-shadow: 0 0 0 0 rgba(47, 158, 99, 0); }
}

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  margin-top: 80px;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(58, 124, 165, 0.12), transparent 60%),
    var(--color-night);
  border-top: 1px solid rgba(215, 177, 106, 0.25);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-banner), transparent 30%, var(--color-flame) 50%, transparent 70%, var(--color-banner));
  opacity: 0.5;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1fr 1.4fr;
  gap: 32px;
  padding: 48px clamp(20px, 4vw, 40px) 32px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 12px;
}

.footer-brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--color-flame);
  color: var(--color-snow);
  font-family: var(--font-display);
  font-weight: 700;
}

.footer-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.footer-brand__text strong {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  color: var(--color-snow);
}

.footer-brand__text small {
  font-size: 0.65rem;
  color: var(--color-rock);
}

.footer-about__text {
  font-size: 0.8rem;
  color: var(--color-rock);
  line-height: 1.8;
  margin-bottom: 10px;
}

.footer-about__trust {
  font-size: 0.72rem;
  color: var(--color-rock);
  line-height: 1.6;
  padding-left: 10px;
  border-left: 2px solid rgba(215, 177, 106, 0.3);
}

.footer-nav__title,
.footer-legal__title,
.footer-contact__title {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--color-banner);
  margin-bottom: 14px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(215, 177, 106, 0.2);
}

.footer-nav a,
.footer-legal a,
.footer-contact a {
  display: block;
  color: var(--color-snow);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 4px 0;
  transition: color var(--ease), padding-left var(--ease);
}

.footer-nav a:hover,
.footer-legal a:hover,
.footer-contact a:hover {
  color: var(--color-flame);
  padding-left: 4px;
}

.footer-contact p {
  font-size: 0.76rem;
  color: var(--color-rock);
  line-height: 1.6;
  margin-bottom: 2px;
}

.footer-contact address {
  font-size: 0.76rem;
  color: var(--color-rock);
  line-height: 1.6;
  padding-top: 4px;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding: 16px clamp(20px, 4vw, 40px);
  border-top: 1px solid rgba(106, 122, 136, 0.15);
  font-size: 0.7rem;
  color: var(--color-rock);
}

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--ease);
}

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

.btn--primary:hover {
  background: #cf4a1e;
  border-color: #cf4a1e;
  color: var(--color-snow);
  box-shadow: 0 6px 20px rgba(232, 97, 42, 0.3);
}

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

.btn--ghost:hover {
  border-color: var(--color-lake);
  color: var(--color-lake);
}

.btn--small {
  padding: 6px 14px;
  font-size: 0.75rem;
}

/* ===== 网格 ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--main { grid-template-columns: 7fr 3fr; }
.grid--aside { grid-template-columns: 3fr 7fr; }

/* ===== 数据卡片 ===== */
.card {
  background: linear-gradient(145deg, rgba(247, 243, 235, 0.05), rgba(247, 243, 235, 0.01));
  border: 1px solid rgba(106, 122, 136, 0.25);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(232, 97, 42, 0.5);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.card__value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--color-flame);
}

.card__label {
  font-size: 0.75rem;
  color: var(--color-rock);
  letter-spacing: 0.06em;
}

/* ===== 状态标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  background: rgba(58, 124, 165, 0.14);
  color: var(--color-lake);
}

.tag--hot { background: rgba(232, 97, 42, 0.14); color: var(--color-flame); }
.tag--ok { background: rgba(47, 158, 99, 0.14); color: var(--color-grass); }
.tag--legacy { background: rgba(181, 106, 69, 0.14); color: var(--color-clay); }

/* ===== 面包屑 ===== */
.breadcrumb {
  margin-bottom: 24px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-rock);
}

.breadcrumb__link {
  color: var(--color-lake);
  text-decoration: none;
}

.breadcrumb__link:hover {
  color: var(--color-flame);
}

.breadcrumb__separator {
  font-size: 0.7rem;
  opacity: 0.6;
}

.breadcrumb__current {
  color: var(--color-snow);
}

/* ===== 段落与标题辅助 ===== */
.lead {
  font-size: 1.05rem;
  color: var(--color-snow);
  opacity: 0.85;
  max-width: 68ch;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

/* ===== 显现动画 ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
  transition-delay: var(--reveal-delay, 0ms);
}

[data-revealed] {
  opacity: 1;
  transform: none;
}

/* ===== 响应式 ===== */
@media (min-width: 1024px) {
  .main-content {
    margin-left: var(--rail-width);
    margin-right: var(--rail-width);
  }

  .footer-inner,
  .footer-meta {
    margin-left: var(--rail-width);
    margin-right: var(--rail-width);
  }
}

@media (max-width: 1023.98px) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 1500;
  }

  .frame-panel--left {
    position: static;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 16px;
    border-right: none;
    border-bottom: 1px solid rgba(106, 122, 136, 0.25);
    background: rgba(11, 26, 42, 0.96);
  }

  .frame-panel--right {
    display: none;
  }

  .frame-brand {
    flex-direction: row;
    gap: 10px;
  }

  .frame-brand__mark {
    width: 34px;
    height: 34px;
    font-size: 1.1rem;
  }

  .frame-brand__text {
    flex-direction: column;
    gap: 2px;
    align-items: flex-start;
  }

  .frame-brand__name {
    writing-mode: horizontal-tb;
    font-size: 0.95rem;
    letter-spacing: 0.06em;
  }

  .frame-brand__tagline {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 14px 16px 16px;
    background: var(--color-night);
    border-bottom: 1px solid rgba(215, 177, 106, 0.25);
    border-radius: 0 0 16px 16px;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.5);
    z-index: 1400;
  }

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

  .site-nav__link {
    width: 100%;
    justify-content: flex-start;
    gap: 10px;
    padding: 10px 16px;
    min-height: 44px;
    font-size: 0.8rem;
  }

  .frame-panel__pattern {
    display: none;
  }

  .footer-inner {
    margin: 0;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 40px 20px 24px;
  }

  .footer-meta {
    margin: 0;
  }
}

@media (max-width: 639.98px) {
  .grid--2,
  .grid--3,
  .grid--main,
  .grid--aside {
    grid-template-columns: 1fr;
  }

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

  .footer-about,
  .footer-nav,
  .footer-legal,
  .footer-contact {
    padding-bottom: 8px;
  }
}

@media (min-width: 640px) and (max-width: 1023.98px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 减少动画 ===== */
@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;
    transition-delay: 0ms !important;
  }

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

  .frame-contact__dot {
    animation: none;
    box-shadow: none;
  }

  .scroll-progress {
    display: none;
  }
}