@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&family=Crimson+Pro:wght@400;500;600;700&display=swap');

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

:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-accent: #000000;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-glass-bg: rgba(255,255,255,0.08);
  --c-glass-border: rgba(255,255,255,0.18);
  --c-glass-shadow: rgba(0,0,0,0.25);
  --nav-h: 64px;
  --radius: 10px;
  --font-body: 'Atkinson Hyperlegible', system-ui, -apple-system, sans-serif;
  --font-display: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  --transition: 0.2s ease;
}

html {
  font-size: 17px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--c-white);
  color: var(--c-black);
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: calc(var(--nav-h) + 1rem);
}

/* ===== 排版基础 ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  opacity: 0.7;
}

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

ul, ol {
  list-style: none;
}

/* ===== 站点包裹 ===== */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== 底部固定导航栏 ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--c-black);
  color: var(--c-white);
  border-top: 1px solid rgba(255,255,255,0.1);
  height: var(--nav-h);
  display: flex;
  align-items: stretch;
}

.nav-details {
  position: relative;
  flex-shrink: 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1.25rem;
  height: var(--nav-h);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  border-right: 1px solid rgba(255,255,255,0.1);
  min-height: 44px;
  user-select: none;
  transition: opacity var(--transition);
}

.nav-brand::-webkit-details-marker { display: none; }

.nav-brand:hover {
  opacity: 0.8;
}

.brand-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.nav-toggle-icon {
  font-size: 1.2rem;
  opacity: 0.7;
  flex-shrink: 0;
}

.nav-menu {
  position: absolute;
  bottom: calc(var(--nav-h) + 4px);
  left: 0;
  background: var(--c-black);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.75rem 0;
  min-width: 240px;
  box-shadow: 0 -8px 32px rgba(0,0,0,0.4);
  animation: slideUp 0.15s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-details:not([open]) .nav-menu {
  display: none;
}

.nav-menu li a {
  display: block;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-menu li a:hover {
  background: rgba(255,255,255,0.1);
  opacity: 1;
}

.nav-quicklinks {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
  gap: 0;
  padding: 0 0.5rem;
}

.nav-icon-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 0.4rem 0.75rem;
  text-decoration: none;
  color: rgba(255,255,255,0.7);
  min-height: 44px;
  min-width: 44px;
  transition: color var(--transition);
  border-radius: 6px;
}

.nav-icon-link:hover,
.nav-icon-link--active {
  color: var(--c-white);
  opacity: 1;
}

.nav-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.nav-label {
  font-size: 0.65rem;
  letter-spacing: 0.03em;
  line-height: 1;
}

/* ===== Hero（首页）===== */
.hero--home {
  position: relative;
  min-height: 45vh;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.6) 100%);
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding: 4rem 2rem 3rem;
  max-width: 900px;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 2rem;
  margin-bottom: 1rem;
  backdrop-filter: blur(4px);
}

.hero-h1 {
  font-size: clamp(2.5rem, 8vw, 7rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1.0;
  margin-bottom: 1.25rem;
  color: var(--c-white);
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.85;
  max-width: 560px;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ===== 页面头部（内页）===== */
.page-header {
  background: var(--c-black);
  color: var(--c-white);
  padding: 4rem 2rem 3rem;
  position: relative;
  overflow: hidden;
}

.page-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--c-white);
  opacity: 0.1;
}

.page-header-inner {
  max-width: 900px;
  margin: 0 auto;
}

.page-h1 {
  font-size: clamp(1.8rem, 5vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-top: 0.75rem;
  margin-bottom: 0.75rem;
  color: var(--c-white);
}

.page-sub {
  font-size: 1.05rem;
  opacity: 0.8;
  margin-top: 0.5rem;
}

.page-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.page-date {
  font-size: 0.85rem;
  opacity: 0.65;
  font-family: var(--font-body);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font-body);
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  min-height: 44px;
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.2);
}

.btn--ghost {
  background: transparent;
  color: var(--c-white);
  border-color: rgba(255,255,255,0.4);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.1);
  opacity: 1;
}

/* ===== 主体布局 ===== */
main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.25rem 2rem;
  width: 100%;
}

.wrap {
  min-width: 0;
}

/* ===== 散文/正文 ===== */
.prose-article {
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 720px;
}

.prose-article h2,
.prose-article h3,
.prose-article h4 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose-article h2 {
  font-size: clamp(1.3rem, 3vw, 2rem);
}

.prose-article h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
}

.prose-article p {
  margin-bottom: 1.2rem;
}

.prose-article ul,
.prose-article ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}

.prose-article ol {
  list-style: decimal;
}

.prose-article li {
  margin-bottom: 0.4rem;
}

.prose-article strong {
  font-weight: 700;
}

.prose-article blockquote {
  border-left: 3px solid var(--c-black);
  padding-left: 1rem;
  opacity: 0.75;
  margin: 1.5rem 0;
}

.prose-article a {
  font-weight: 600;
}

/* ===== 眉题（small + h2 组合）===== */
small.eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 0.5rem;
  font-family: var(--font-body);
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: 1.75rem;
}

/* ===== 玻璃卡片 ===== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

.glass-card {
  background: var(--c-gray-100);
  border: 1px solid var(--c-gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}

.card-inner {
  padding: 1.5rem;
}

.card-date {
  font-size: 0.78rem;
  opacity: 0.55;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.card-title a {
  text-decoration: none;
}

.card-title a:hover {
  text-decoration: underline;
}

.card-desc {
  font-size: 0.9rem;
  opacity: 0.7;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.card-link {
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--c-black);
  padding-bottom: 1px;
}

/* ===== 指南 DL 列表 ===== */
.guide-dl {
  margin-bottom: 2.5rem;
}

.guide-dl dt {
  margin-top: 1.25rem;
  margin-bottom: 0.3rem;
}

.guide-dl dt a {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  border-bottom: 2px solid var(--c-black);
  padding-bottom: 1px;
  transition: opacity var(--transition);
}

.guide-dl dt a:hover {
  opacity: 0.6;
}

.guide-dl dd {
  font-size: 0.9rem;
  opacity: 0.65;
  line-height: 1.55;
  padding-left: 0;
}

/* ===== CTA 区块 ===== */
.cta-section {
  margin-top: 3rem;
  padding: 3rem 0;
  border-top: 1px solid var(--c-gray-200);
}

.cta-heading {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.cta-item {
  padding: 0.6rem 1.25rem;
  border: 1.5px solid var(--c-black);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.cta-item:hover {
  background: var(--c-black);
  color: var(--c-white);
  opacity: 1;
}

/* ===== 侧边栏 ===== */
.page-aside,
.home-aside {
  margin-top: 3rem;
}

.aside-inner {
  background: var(--c-black);
  color: var(--c-white);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.aside-inner small.eyebrow {
  opacity: 0.5;
  color: var(--c-white);
}

.aside-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  color: var(--c-white);
}

.aside-list {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.aside-list li a {
  display: block;
  padding: 0.5rem 0;
  font-size: 0.92rem;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-list li a:hover {
  color: var(--c-white);
  opacity: 1;
}

.aside-note {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.82rem;
  opacity: 0.6;
  line-height: 1.55;
}

/* ===== 首页独有区块 ===== */
.home-content {
  padding-bottom: 1rem;
}

.guides-section {
  margin-top: 3.5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--c-gray-200);
}

/* ===== Changelog / FAQ 内页额外 ===== */
.faq-guides,
.changelog-nav-section {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--c-gray-200);
}

/* ===== 指南 Hero 图片 ===== */
.guide-hero-media {
  max-height: 280px;
  overflow: hidden;
  margin-top: 2rem;
}

.guide-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 页脚 ===== */
.site-footer {
  margin-top: auto;
  background: var(--c-black);
  color: var(--c-white);
}

.footer-cta {
  padding: 3.5rem 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-cta-text {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  opacity: 0.9;
}

.footer-meta {
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

.footer-copy {
  font-size: 0.8rem;
  opacity: 0.5;
  line-height: 1.6;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--c-white);
  opacity: 1;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 768px) {
  main {
    grid-template-columns: 1fr 280px;
    gap: 3rem;
    padding: 4rem 2rem 3rem;
    align-items: start;
  }

  .page-aside,
  .home-aside {
    margin-top: 0;
    position: sticky;
    top: 2rem;
  }

  .home-aside {
    grid-column: 2;
    grid-row: 1 / 3;
  }

  .nav-quicklinks {
    justify-content: center;
  }

  .hero-inner {
    padding: 5rem 3rem 4rem;
  }

  .page-header {
    padding: 5rem 3rem 4rem;
  }
}

@media (min-width: 1024px) {
  .brand-text {
    max-width: 200px;
  }

  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== 深色模式 ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --c-gray-100: #111111;
    --c-gray-200: #222222;
    --c-gray-400: #666666;
    --c-gray-600: #aaaaaa;
  }

  body {
    background: #0a0a0a;
    color: var(--c-white);
  }

  .glass-card {
    background: #111111;
    border-color: #2a2a2a;
  }

  .card-link {
    border-color: var(--c-white);
  }

  .cta-item {
    border-color: var(--c-white);
  }

  .cta-item:hover {
    background: var(--c-white);
    color: var(--c-black);
  }

  .guide-dl dt a {
    border-color: var(--c-white);
  }

  .aside-inner {
    background: #111111;
    border: 1px solid #2a2a2a;
  }

  .aside-title {
    color: var(--c-white);
  }

  .page-header::after {
    background: var(--c-white);
    opacity: 0.05;
  }

  .guides-section,
  .cta-section,
  .faq-guides,
  .changelog-nav-section {
    border-top-color: #222222;
  }
}

/* ===== 动效（prefers-reduced-motion 尊重）===== */
@media (prefers-reduced-motion: no-preference) {
  .glass-card {
    transition: transform 0.22s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.22s ease;
  }

  .glass-card:hover {
    transform: translateY(-6px) scale(1.01);
  }

  .btn {
    transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.2s ease, opacity 0.15s ease;
  }

  .hero-h1 {
    animation: fadeInUp 0.5s ease both;
  }

  .hero-sub {
    animation: fadeInUp 0.5s 0.1s ease both;
  }

  .hero-cta {
    animation: fadeInUp 0.5s 0.2s ease both;
  }

  @keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===== 打印 ===== */
@media print {
  .bottom-nav,
  .page-aside,
  .home-aside {
    display: none;
  }
  body {
    padding-bottom: 0;
  }
}