@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;1,400&display=swap');

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

:root {
  --c-bg: #000000;
  --c-fg: #ffffff;
  --c-accent: #ff4500;
  --c-accent-dim: #cc3700;
  --c-muted: #444444;
  --c-border: #222222;
  --c-pill-bg: #111111;
  --font-mono: 'JetBrains Mono', 'Courier New', Courier, monospace;
  --nav-h: 64px;
  --anchor-h: 44px;
  --scroll-offset: calc(var(--nav-h) + var(--anchor-h) + 8px);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font-mono);
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
}

article[id] {
  scroll-margin-top: var(--scroll-offset);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, menu {
  list-style: none;
}

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

/* ===== 点阵底纹 ===== */
.dot-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, #1a1a1a 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.55;
}

/* ===== 公告条 ===== */
.announce-bar {
  background: var(--c-accent);
  color: var(--c-bg);
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 6px 16px;
  text-transform: uppercase;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0,0,0,0.95);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(6px);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--nav-h);
  padding: 0 24px;
  max-width: 1400px;
  margin: 0 auto;
}

/* 品牌图标 */
.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  margin-right: auto;
}

.brand-text {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--c-accent);
  border: 2px solid var(--c-accent);
  border-radius: 4px;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

/* 内联菜单（桌面） */
.nav-menu--inline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--c-fg);
  background: var(--c-pill-bg);
  transition: background 0.18s, border-color 0.18s, color 0.18s;
  white-space: nowrap;
}

.nav-pill:hover,
.nav-pill:focus-visible {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
  outline: none;
}

/* details 折叠导航（移动端） */
.nav-details {
  display: none;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  cursor: pointer;
  list-style: none;
  background: var(--c-pill-bg);
  color: var(--c-fg);
}

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

.nav-details[open] .nav-toggle {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
}

.nav-details menu {
  position: absolute;
  top: calc(var(--nav-h) - 2px);
  right: 16px;
  background: #0d0d0d;
  border: 1px solid var(--c-border);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 180px;
  z-index: 200;
}

.nav-details menu li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  transition: background 0.15s;
}

.nav-details menu li a:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
}

/* ===== 粘性锚点条 ===== */
.sticky-anchor {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: rgba(0,0,0,0.9);
  border-bottom: 1px solid var(--c-border);
  backdrop-filter: blur(4px);
}

.anchor-inner {
  display: flex;
  gap: 6px;
  padding: 6px 24px;
  overflow-x: auto;
  scrollbar-width: none;
  max-width: 1400px;
  margin: 0 auto;
}

.anchor-inner::-webkit-scrollbar { display: none; }

.anchor-pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  white-space: nowrap;
  border: 1px solid #333;
  color: #aaa;
  transition: all 0.15s;
  flex-shrink: 0;
}

.anchor-pill:hover,
.anchor-pill:focus-visible {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg);
  outline: none;
}

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8rem 24px 6rem;
  overflow: hidden;
  z-index: 1;
}

.hero-aside {
  position: absolute;
  top: 2rem;
  left: 2rem;
  z-index: 2;
}

.eyebrow-tag {
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  padding: 4px 12px;
  border-radius: 999px;
}

.hero-text {
  text-align: center;
  z-index: 2;
  position: relative;
  max-width: 900px;
}

.hero-h1 {
  font-size: clamp(3rem, 10vw, 12rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 0.9;
  color: var(--c-fg);
  margin-bottom: 2rem;
  word-break: break-all;
}

.hero-sub {
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  color: #888;
  max-width: 560px;
  margin: 0 auto 3rem;
  letter-spacing: 0.03em;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* 胶囊按钮 */
.btn-pill {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 32px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.18s;
  border: 2px solid transparent;
}

.btn-pill--primary {
  background: var(--c-accent);
  color: var(--c-bg);
  border-color: var(--c-accent);
}

.btn-pill--primary:hover,
.btn-pill--primary:focus-visible {
  background: transparent;
  color: var(--c-accent);
  outline: none;
}

.btn-pill--ghost {
  background: transparent;
  color: var(--c-fg);
  border-color: var(--c-border);
}

.btn-pill--ghost:hover,
.btn-pill--ghost:focus-visible {
  border-color: var(--c-fg);
  background: var(--c-fg);
  color: var(--c-bg);
  outline: none;
}

/* Hero figure / 底纹网格 */
.hero-figure {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  margin: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
}

.hero-figure--grid .grid-deco {
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
}

/* 炉火橙色光晕装饰 */
.hero-section::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 200px;
  background: radial-gradient(ellipse at center, rgba(255,69,0,0.25) 0%, transparent 70%);
  pointer-events: none;
  z-index: 1;
}

/* ===== 内容区（正文 + aside） ===== */
.content-sections {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 260px;
  grid-template-rows: auto 1fr;
  gap: 0 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 24px 8rem;
}

.content-deco {
  grid-column: 1 / -1;
  margin: 0 0 4rem;
}

.fire-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-accent), #ff8c00, var(--c-accent), transparent);
  border-radius: 1px;
}

.content-body {
  grid-column: 1;
  min-width: 0;
}

/* ===== page.content 内部样式 ===== */
.content-body h2 {
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--c-fg);
  margin: 5rem 0 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--c-border);
}

.content-body h2:first-child {
  margin-top: 0;
}

.content-body h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 2.5rem 0 1rem;
  color: var(--c-fg);
}

.content-body h4 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin: 2rem 0 0.75rem;
}

.content-body p {
  font-size: 1rem;
  line-height: 1.75;
  color: #ccc;
  margin-bottom: 1.25rem;
  max-width: 72ch;
}

.content-body ul,
.content-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.content-body li {
  font-size: 1rem;
  line-height: 1.7;
  color: #ccc;
  margin-bottom: 0.5rem;
}

.content-body strong {
  color: var(--c-fg);
  font-weight: 700;
}

.content-body a {
  color: var(--c-accent);
  text-decoration: underline;
  text-decoration-color: rgba(255,69,0,0.4);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s;
}

.content-body a:hover {
  text-decoration-color: var(--c-accent);
}

.content-body blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  color: #aaa;
  font-style: italic;
  background: #0a0a0a;
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.content-body th,
.content-body td {
  border: 1px solid var(--c-border);
  padding: 10px 14px;
  text-align: left;
}

.content-body th {
  background: #111;
  color: var(--c-fg);
  font-weight: 700;
}

.content-body td {
  color: #bbb;
}

.content-body article {
  padding: 2rem 0;
  border-bottom: 1px solid #111;
}

.content-body article:last-child {
  border-bottom: none;
}

/* aside（右栏） */
.content-aside {
  grid-column: 2;
  grid-row: 2;
  position: sticky;
  top: calc(var(--nav-h) + var(--anchor-h) + 24px);
  height: fit-content;
  align-self: start;
}

.aside-inner {
  border: 1px solid var(--c-border);
  padding: 24px;
  background: #060606;
}

.aside-title {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 16px;
  font-weight: 700;
}

.aside-title span {
  display: inline;
}

.aside-nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 12px;
  font-size: 0.78rem;
  color: #999;
  border-radius: 2px;
  transition: color 0.15s, background 0.15s;
  line-height: 1.4;
}

.aside-link:hover {
  color: var(--c-fg);
  background: #111;
}

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--c-border);
  padding: 6rem 24px 3rem;
  background: #030303;
}

.footer-brand-row {
  margin-bottom: 4rem;
  overflow: hidden;
}

.footer-brand-huge {
  display: block;
  font-size: clamp(3rem, 12vw, 9rem);
  font-weight: 900;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px #333;
  line-height: 0.9;
  user-select: none;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  max-width: 1000px;
  margin: 0 auto 4rem;
}

.footer-dl dt {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 12px;
  font-weight: 700;
}

.footer-dl dt span {
  display: inline;
}

.footer-dl dd {
  font-size: 0.82rem;
  color: #666;
  line-height: 1.6;
  margin-bottom: 8px;
}

.footer-link {
  color: #666;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  transition: color 0.15s;
  font-size: 0.82rem;
}

.footer-link:hover {
  color: var(--c-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 3rem;
  border-top: 1px solid var(--c-border);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: #444;
  letter-spacing: 0.06em;
}

/* ===== 动效：Hover Micro-interaction ===== */
@media (prefers-reduced-motion: no-preference) {
  .hero-h1 {
    animation: flicker-in 0.6s ease both;
  }

  @keyframes flicker-in {
    0%   { opacity: 0; transform: translateY(20px); }
    60%  { opacity: 1; transform: translateY(-4px); }
    100% { transform: translateY(0); }
  }

  .nav-pill,
  .anchor-pill,
  .btn-pill,
  .aside-link,
  .footer-link {
    will-change: transform;
  }

  .nav-pill:hover,
  .anchor-pill:hover,
  .btn-pill:hover {
    transform: translateY(-1px);
  }

  .content-body h2 {
    transition: color 0.2s;
  }

  .hero-text {
    will-change: transform;
  }
}

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

/* ===== 响应式：移动端 ===== */
@media (max-width: 900px) {
  .content-sections {
    grid-template-columns: 1fr;
    padding: 4rem 20px 6rem;
  }

  .content-deco {
    grid-column: 1;
  }

  .content-body {
    grid-column: 1;
  }

  .content-aside {
    grid-column: 1;
    grid-row: auto;
    position: static;
  }

  .aside-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 16px;
  }

  .aside-title {
    width: 100%;
    margin-bottom: 8px;
  }

  .aside-nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .aside-link {
    border: 1px solid var(--c-border);
    border-radius: 999px;
    padding: 0 14px;
    min-height: 44px;
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-h: 56px;
    --anchor-h: 48px;
  }

  .main-nav {
    padding: 0 16px;
  }

  .nav-menu--inline {
    display: none;
  }

  .nav-details {
    display: block;
    position: relative;
    margin-left: auto;
  }

  .hero-section {
    padding: 6rem 20px 4rem;
    min-height: 70vh;
  }

  .hero-h1 {
    word-break: break-word;
  }

  .announce-bar {
    font-size: 0.65rem;
    padding: 5px 12px;
  }

  .anchor-inner {
    padding: 4px 16px;
    gap: 6px;
  }

  .anchor-pill {
    min-height: 44px;
    font-size: 0.7rem;
    padding: 0 12px;
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-brand-huge {
    font-size: clamp(3rem, 18vw, 6rem);
  }

  .site-footer {
    padding: 4rem 20px 2.5rem;
  }

  .content-sections {
    padding: 3rem 20px 4rem;
  }
}

/* ===== 无障碍：焦点可见 ===== */
:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c-accent);
}