styles.css

/* ==========================================================================
   famiji — GitHub Pages 主页
   风格参考 aiengineeringfromscratch.com：纸张米白底、硬黑边框、
   蓝图蓝强调、VT323 像素标题 + Source Serif 衬线正文 + JetBrains Mono
   支持日间 / 夜间双主题（html[data-theme]）
   ========================================================================== */

:root {
  --font-display: "VT323", "Courier New", ui-monospace, monospace;
  --font-body: "Source Serif 4", "Source Serif Pro", Georgia, "Songti SC", serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;

  --bg: #fafaf5;
  --bg-elev: #f3f1e8;
  --card: #f3f1e8;
  --card-hover: #ece9dc;
  --ink: #1a1a1a;
  --ink-dim: #4a4a4a;
  --ink-mute: #7a7a78;
  --border: #1a1a1a;
  --border-soft: rgba(26, 26, 26, 0.18);
  --accent: #3553ff;
  --accent-tint: rgba(53, 83, 255, 0.08);
  --code-bg: #efece0;
  --status: #3553ff;
  --header-bg: rgba(250, 250, 245, 0.94);
}

html[data-theme="dark"] {
  --bg: #141414;
  --bg-elev: #1c1c1c;
  --card: #1c1c1c;
  --card-hover: #262626;
  --ink: #f2f1ea;
  --ink-dim: #b8b6ad;
  --ink-mute: #8a8880;
  --border: rgba(242, 241, 234, 0.55);
  --border-soft: rgba(242, 241, 234, 0.18);
  --accent: #8fa2ff;
  --accent-tint: rgba(143, 162, 255, 0.12);
  --code-bg: #242424;
  --status: #8fa2ff;
  --header-bg: rgba(20, 20, 20, 0.9);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

::selection { background: var(--accent); color: #ffffff; }

.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.dim { color: var(--ink-mute); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 64px);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
}

.logo-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
}

.cursor-blink { animation: blink 1.1s steps(1) infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

.nav-links { display: flex; gap: 24px; align-items: center; }

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--ink);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, transform 0.15s;
}

.theme-toggle:hover { background: var(--bg-elev); transform: translateY(-1px); }
.theme-toggle svg { width: 16px; height: 16px; }
.icon-moon { display: block; }
.icon-sun { display: none; }
html[data-theme="dark"] .icon-moon { display: none; }
html[data-theme="dark"] .icon-sun { display: block; }

/* ---------- Hero ---------- */
.hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(88px, 15vw, 156px) clamp(20px, 5vw, 64px) 88px;
}

.hero-kicker {
  color: var(--ink-mute);
  font-size: 14px;
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(56px, 12vw, 128px);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.04;
}

.hero-title .accent { color: var(--accent); }

.hero-status {
  margin-top: 32px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--ink);
  padding: 8px 16px;
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  background: var(--accent-tint);
}

.status-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--status);
  box-shadow: 0 0 0 0 rgba(53, 83, 255, 0.45);
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(53, 83, 255, 0.45); }
  70%  { box-shadow: 0 0 0 9px rgba(53, 83, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 83, 255, 0); }
}

/* ---------- 联系图标 ---------- */
.hero-icons {
  margin-top: 36px;
  display: flex;
  gap: 12px;
}

.icon-btn {
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--ink-mute);
  background: transparent;
  transition: color 0.25s, border-color 0.25s, background-color 0.25s, transform 0.15s;
}

.icon-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-tint);
  transform: translateY(-2px);
}

.icon-btn svg { width: 20px; height: 20px; }

/* ---------- 终端窗口 ---------- */
.terminal {
  max-width: 720px;
  margin: 0 auto 88px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}

.terminal-prompt { color: var(--accent); font-size: 14px; }
.terminal-title { font-size: 13px; color: var(--ink-mute); }

.terminal-body {
  padding: 20px 22px 22px;
  font-size: 14px;
  min-height: 150px;
}

.terminal-body .t-line { margin-bottom: 2px; white-space: pre-wrap; }
.terminal-body .t-cmd { color: var(--ink); }
.terminal-body .t-prompt { color: var(--accent); }
.terminal-body .t-out { color: var(--ink-dim); }

.t-cursor-line { margin-top: 6px; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border-soft);
  padding: 32px clamp(20px, 5vw, 64px) 44px;
  text-align: center;
}

.footer .mono { font-size: 13px; color: var(--ink-mute); }

/* ---------- 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible { opacity: 1; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .nav { padding: 14px 20px; }
  .nav-links { gap: 16px; }
  .hero { padding-top: 64px; }
  .terminal-body { font-size: 12.5px; padding: 16px 18px; }
}