/* ===== common.css — 2019血疫纪元 — Multi-theme system ===== */

/* --- Theme: Warm (default) --- */
:root {
  --bg-base: #f5efe0;
  --bg-surface: #ede5d5;
  --bg-elevated: #e5dbc8;
  --bg-card: #f2ead8;
  --text-primary: #3d3229;
  --text-secondary: #6b5d4f;
  --text-dim: #a09080;
  --text-body: #4a3f35;
  --accent: #6b9e5a;
  --accent-glow: rgba(107,158,90,0.15);
  --accent-dim: rgba(107,158,90,0.45);
  --accent-warm: #c48a30;
  --accent-blue: #5a8cbf;
  --accent-red: #c45c5c;
  --border: rgba(60,45,30,0.1);
  --border-hover: rgba(60,45,30,0.18);
  --header-bg: rgba(245,239,224,0.92);
  --header-border: rgba(60,45,30,0.08);
  --selection-bg: rgba(107,158,90,0.3);
  --scrollbar-thumb: rgba(60,45,30,0.15);
  --scrollbar-hover: rgba(60,45,30,0.28);
  --code-bg: rgba(60,45,30,0.06);
  --blockquote-bg: rgba(107,158,90,0.05);
  --blockquote-border: rgba(107,158,90,0.35);
  --shadow: rgba(60,45,30,0.08);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.25s ease;
}

/* --- Theme: Light --- */
[data-theme="light"] {
  --bg-base: #fafaf8;
  --bg-surface: #f2f2f0;
  --bg-elevated: #eaeae8;
  --bg-card: #ffffff;
  --text-primary: #2c2c2c;
  --text-secondary: #5a5a5a;
  --text-dim: #999;
  --text-body: #444;
  --accent: #5baa7e;
  --accent-glow: rgba(91,170,126,0.12);
  --accent-dim: rgba(91,170,126,0.45);
  --accent-warm: #d4944a;
  --accent-blue: #5a8cbf;
  --accent-red: #c45c5c;
  --border: rgba(0,0,0,0.08);
  --border-hover: rgba(0,0,0,0.15);
  --header-bg: rgba(255,255,255,0.92);
  --header-border: rgba(0,0,0,0.06);
  --selection-bg: rgba(91,170,126,0.3);
  --scrollbar-thumb: rgba(0,0,0,0.12);
  --scrollbar-hover: rgba(0,0,0,0.22);
  --code-bg: rgba(0,0,0,0.05);
  --blockquote-bg: rgba(91,170,126,0.04);
  --blockquote-border: rgba(91,170,126,0.35);
  --shadow: rgba(0,0,0,0.06);
}

/* --- Theme: Dark (high contrast) --- */
[data-theme="dark"] {
  --bg-base: #1a1c20;
  --bg-surface: #22242a;
  --bg-elevated: #2a2c32;
  --bg-card: #26282e;
  --text-primary: #e0dcd4;
  --text-secondary: #a8a098;
  --text-dim: #706860;
  --text-body: #d0ccc4;
  --accent: #6bc88e;
  --accent-glow: rgba(107,200,142,0.15);
  --accent-dim: rgba(107,200,142,0.45);
  --accent-warm: #e0a050;
  --accent-blue: #6aa0d0;
  --accent-red: #d06868;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --header-bg: rgba(26,28,32,0.92);
  --header-border: rgba(255,255,255,0.06);
  --selection-bg: rgba(107,200,142,0.3);
  --scrollbar-thumb: rgba(255,255,255,0.1);
  --scrollbar-hover: rgba(255,255,255,0.2);
  --code-bg: rgba(255,255,255,0.04);
  --blockquote-bg: rgba(107,200,142,0.05);
  --blockquote-border: rgba(107,200,142,0.35);
  --shadow: rgba(0,0,0,0.25);
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }

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

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

:focus-visible { outline: 2px solid var(--accent-dim); outline-offset: 2px; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent-dim); outline-offset: 2px; border-radius: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ===== Body ===== */
body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  overflow-x: hidden;
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.35s ease, color 0.35s ease;
}

/* ===== Page Header ===== */
.page-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.8rem 2rem;
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.35s ease;
}
.page-header .logo {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.9rem; color: var(--text-primary);
  cursor: pointer; text-decoration: none;
  letter-spacing: 0.05em;
}
.page-header .logo span { color: var(--accent); }
.page-header .nav-links {
  display: flex; gap: 1.2rem; align-items: center;
}
.page-header .nav-links a {
  font-size: 0.75rem; color: var(--text-dim);
  text-decoration: none; transition: color 0.3s;
  letter-spacing: 0.05em;
}
.page-header .nav-links a:hover { color: var(--accent); }
.page-header .nav-links a.active { color: var(--accent-dim); }

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: fixed; bottom: 2rem; left: 2rem;
  z-index: 200;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px var(--shadow);
  padding: 0;
  line-height: 1;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.4s ease forwards; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
  padding: 0.6rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.82rem;
  z-index: 999;
  animation: fadeIn 0.3s ease;
  pointer-events: none;
  box-shadow: 0 4px 20px var(--shadow);
}

/* ===== Theme Switch JS (inline in each page) =====
  Add to each page:
  <button class="theme-toggle" onclick="cycleTheme()" title="切换主题">☀</button>
  <script>
  (function(){var t=localStorage.getItem('theme')||'warm';document.documentElement.setAttribute('data-theme',t);window.cycleTheme=function(){var s=['warm','light','dark'];var i=(s.indexOf(document.documentElement.getAttribute('data-theme'))+1)%s.length;document.documentElement.setAttribute('data-theme',s[i]);localStorage.setItem('theme',s[i]);document.querySelector('.theme-toggle').textContent={warm:'☀',light:'○',dark:'●'}[s[i]];};document.querySelector('.theme-toggle').textContent={warm:'☀',light:'○',dark:'●'}[t];})();
  </script>
*/