:root {
  --bg: #fff7f2;
  --bg-deep: #fff2ea;
  --text: #4a3b34;
  --muted: #7a6b62;
  --primary: #d27b5f; /* 柔和的赤陶色 */
  --primary-dark: #b5664f;
  --secondary: #f0c7a1; /* 奶杏色 */
  --card: #ffffff;
  --shadow: rgba(50, 30, 20, 0.08);
  --border: rgba(210, 123, 95, 0.22);
  /* 粒子与环境光变量 */
  --particle-rgb: 226, 154, 127;
  --particle-alpha: 0.22; /* 兼容旧逻辑 */
  --particle-core-alpha: 0.26; /* 粒子中心更亮 */
  --particle-soft-alpha: 0.06; /* 边缘更柔和 */
  /* 动态环境光与插画颜色变量 */
  --ambient-rgb: 226, 154, 127; /* 环境光基础色（RGB） */
  --ambient-strong-alpha: 0.22;
  --ambient-weak-alpha: 0.08;
  --glow-alpha: 0.35; /* 英雄插画光晕强度 */
  --lamp-1: #ffd6b8; /* 英雄插画灯光颜色组 */
  --lamp-2: #f0c7a1;
  --lamp-3: #caa588;
}

/* 暗色主题变量 */
.dark {
  --bg: #1f1a17;
  --bg-deep: #1a1613;
  --text: #eae0d9;
  --muted: #cbbfb6;
  --primary: #e29a7f;
  --primary-dark: #cf8467;
  --secondary: #6d5b4f;
  --card: #2a241f;
  --shadow: rgba(0, 0, 0, 0.25);
  --border: rgba(220, 160, 135, 0.35);
  --particle-rgb: 210, 140, 115;
  --particle-alpha: 0.18; /* 兼容旧逻辑 */
  --particle-core-alpha: 0.20;
  --particle-soft-alpha: 0.04;
  /* 暗色主题下的环境光与插画变量（更克制） */
  --ambient-rgb: 210, 140, 115;
  --ambient-strong-alpha: 0.16;
  --ambient-weak-alpha: 0.06;
  --glow-alpha: 0.28;
  --lamp-1: #e1b4a0;
  --lamp-2: #caa588;
  --lamp-3: #a07d69;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Nunito', 'Noto Serif SC', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-size: 200% 200%;
  animation: bg-pan 36s ease-in-out infinite alternate;
  transition: background 380ms ease, color 280ms ease;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(100, 70, 50, 0.08);
  z-index: 100;
}
.dark .site-header { background: rgba(32, 26, 22, 0.6); border-bottom-color: rgba(255, 230, 220, 0.08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 56px; }
.dark .site-header { background: rgba(32, 26, 22, 0.6); border-bottom-color: rgba(255, 230, 220, 0.08); }

/* 固定导航栏后为主内容增加顶部内边距，避免遮挡 */
main { padding-top: 68px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand .logo { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; transition: color 280ms ease, transform 280ms ease; }
.logo-svg { width: 24px; height: 24px; }
.logo-svg .lp-1 { fill: #f7e1d2; }
.logo-svg .lp-2 { fill: #d27b5f; }
.dark .logo-svg .lp-1 { fill: #bcaea4; }
.dark .logo-svg .lp-2 { fill: #e29a7f; }
.brand h1 { font-family: 'Noto Serif SC', serif; font-size: 20px; margin: 0; }
/* 根据主题切换，logo显示太阳/月亮图标，保持温暖风格 */
.brand .logo { transition: color 280ms ease, transform 280ms ease; }
.dark .brand .logo { filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2)); }

.nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--text); text-decoration: none; font-weight: 600; position: relative; transition: color 280ms ease, transform 220ms ease; }
.nav a:hover { color: var(--primary); }
/* 导航链接下划线动画与激活态 */
.nav a::after { content: ""; position: absolute; left: 0; bottom: -4px; width: 100%; height: 2px; background: var(--primary); transform: scaleX(0); transform-origin: 0 50%; transition: transform 300ms ease; opacity: 0.75; }
.nav a.active::after { transform: scaleX(1); }

/* 页面平滑滚动，提升跳转流畅度 */
html { scroll-behavior: smooth; }
/* 全局链接不显示下划线 */
a { text-decoration: none; color: inherit; }
a:hover { text-decoration: none; color: var(--primary); }

/* 全局取消链接下划线，保持温和配色下的整洁视觉 */
a { text-decoration: none; color: inherit; }
a:hover { text-decoration: none; color: var(--primary); }

.btn {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(210, 123, 95, 0.3);
  color: var(--text);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}
.btn.icon { padding: 6px 10px; display: inline-flex; align-items: center; }
.theme-svg { width: 22px; height: 22px; }
.theme-svg .sun { display: inline; }
.theme-svg .moon { display: none; }
.dark .theme-svg .sun { display: none; }
.dark .theme-svg .moon { display: inline; }
.theme-svg .ti-core { fill: #d27b5f; }
.theme-svg .ti-rays line { stroke: #d27b5f; stroke-width: 1.6; stroke-linecap: round; }
.theme-svg .ti-moon { fill: #bcaea4; }
.dark .theme-svg .ti-core { fill: #e29a7f; }
.dark .theme-svg .ti-rays line { stroke: #e29a7f; }
.dark .theme-svg .ti-moon { fill: #e5d7c9; }
.dark .btn.icon { background: rgba(255, 255, 255, 0.16); color: var(--text); border-color: var(--border); }
.dark .btn.icon:hover { background: rgba(255, 255, 255, 0.22); }
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 20px var(--shadow); }
.btn.primary { background: var(--primary); color: white; border-color: var(--primary-dark); }
.btn.primary:hover { background: var(--primary-dark); }
.btn.secondary { background: var(--secondary); color: #4a3b34; border-color: var(--secondary); }

/* 暗色主题下的按钮可读性与对比度优化 */
.dark .btn { background: rgba(255, 255, 255, 0.18); border-color: var(--border); color: var(--text); }
.dark .btn:hover { box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35); }
.dark .btn.primary { background: var(--primary); color: #fff7f2; border-color: var(--primary-dark); }
.dark .btn.primary:hover { background: var(--primary-dark); }
.dark .btn.secondary { background: var(--secondary); color: #fff1e7; border-color: var(--secondary); }
.dark .btn.secondary:hover { filter: brightness(1.05); }

/* 针对深夜模式下特定容器内按钮的增强可读性（更强对比） */
.dark .card .btn,
.dark .hub-actions .btn,
.dark .featured-actions .btn,
.dark .cta .btn {
  background: rgba(255, 255, 255, 0.22);
  color: #fff1e7;
  border-color: rgba(255, 230, 220, 0.28);
}
.dark .card .btn:hover,
.dark .hub-actions .btn:hover,
.dark .featured-actions .btn:hover,
.dark .cta .btn:hover {
  background: rgba(255, 255, 255, 0.26);
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  min-height: 68vh;
}
.hero h2 { font-family: 'Noto Serif SC', serif; font-size: 40px; margin-bottom: 12px; }
.hero p { color: var(--muted); font-size: 18px; }
.cta { margin-top: 18px; display: flex; gap: 12px; }

.hero-illustration { position: relative; height: 340px; }
.lamp {
  width: 160px; height: 160px; border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, var(--lamp-1), var(--lamp-2) 60%, var(--lamp-3) 100%);
  box-shadow: 0 30px 60px var(--shadow);
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  transition: transform 420ms ease, filter 420ms ease, background 420ms ease;
}
.lamp.sun {
  background: radial-gradient(circle at 40% 40%, #ffe1bf, #f5cda8 60%, #d3a789 100%);
  box-shadow: 0 30px 60px rgba(210, 123, 95, 0.20);
}
.lamp.moon {
  background: radial-gradient(circle at 45% 40%, #d9d6cf, #b9b3aa 60%, #9b9287 100%);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.25);
}
.glow {
  width: 260px; height: 260px; border-radius: 50%; position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(var(--ambient-rgb), var(--glow-alpha)), rgba(var(--ambient-rgb), var(--ambient-weak-alpha)) 60%, transparent 70%);
  filter: blur(4px);
  animation: pulse 3.8s ease-in-out infinite;
  transition: opacity 320ms ease, filter 320ms ease, transform 320ms ease;
}
/* 主题切换时的插画轻微响应 */
.theme-switching .lamp { transform: translate(-50%, -50%) scale(1.02) rotate(-1deg); }
.glow.bump { animation: glowShift 780ms ease; }

@keyframes pulse { 0%, 100% { transform: translate(-50%, -50%) scale(1); } 50% { transform: translate(-50%, -50%) scale(1.04); } }
@keyframes glowShift {
  0% { transform: translate(-50%, -50%) scale(1); opacity: 0.85; }
  50% { transform: translate(-50%, -50%) scale(1.08); opacity: 1; }
  100% { transform: translate(-50%, -50%) scale(1.02); opacity: 0.9; }
}

.stories { display: none; }
.gallery { display: none; }
.card {
  background: var(--card);
  border-radius: 18px;
  box-shadow: 0 12px 30px var(--shadow);
  padding: 18px 20px;
  margin: 16px 0;
  border: 1px solid var(--border);
}
.card h4 { margin: 8px 0 6px; }
.card p { color: var(--muted); line-height: 1.8; }

/* 精选推荐 */
.featured { padding: 10px 0 50px; }
.featured .section-desc { color: var(--muted); margin: 6px 0 16px; }
.featured-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.featured-card { background: var(--card); border-radius: 18px; box-shadow: 0 12px 30px var(--shadow); border: 1px solid rgba(210, 123, 95, 0.18); padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.featured-card { border-color: var(--border); }
.featured-header { display: flex; align-items: center; gap: 10px; }
.featured-icon { font-size: 22px; }
.featured-title { font-family: 'Noto Serif SC', serif; font-size: 18px; margin: 0; }
.featured-desc { color: var(--muted); font-size: 14px; line-height: 1.7; }
.featured-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.featured-actions .btn { font-size: 14px; padding: 6px 10px; }

/* 最近更新 */
.updates { padding: 10px 0 50px; }
.updates .section-desc { color: var(--muted); margin: 6px 0 16px; }
.update-list { list-style: none; padding: 0; margin: 0; }
.update-item { display: flex; gap: 10px; align-items: flex-start; padding: 10px 0; border-bottom: 1px dashed var(--border); }
.update-time { color: var(--muted); font-size: 12px; }
.update-text { color: var(--text); }

/* 关于与联系 */
.about, .contact { padding: 10px 0 50px; }
.about .section-desc, .contact .section-desc { color: var(--muted); margin: 6px 0 16px; }

.site-footer { border-top: 1px solid rgba(100, 70, 50, 0.08); padding: 20px 0; }
.site-footer p { color: var(--muted); text-align: center; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding: 20px 0 30px; }
  .hero-illustration { order: -1; height: 260px; }
  .featured-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 520px) {
  .featured-grid { grid-template-columns: 1fr; }
}

/* 创意枢纽样式 */
.hub { padding: 10px 0 70px; position: relative; }
.hub .section-desc { color: var(--muted); margin: 6px 0 16px; }
.hub-filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.chip {
  padding: 6px 12px; border-radius: 999px; border: 1px solid rgba(210, 123, 95, 0.3);
  background: rgba(255, 255, 255, 0.7); cursor: pointer; color: var(--text);
}
.chip.active { background: var(--primary); border-color: var(--primary-dark); color: #fff; }
/* 深夜模式下：四个筛选按钮的未选态与选中态对比更明确 */
.dark .chip { background: rgba(255, 255, 255, 0.16); color: var(--text); border-color: var(--border); }
.dark .chip:hover { background: rgba(255, 255, 255, 0.22); }
.dark .chip.active { background: var(--primary); border-color: var(--primary-dark); color: #fff7f2; }

.hub-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.hub-card {
  background: var(--card);
  border-radius: 18px; box-shadow: 0 12px 30px var(--shadow);
  border: 1px solid var(--border); padding: 16px;
  display: flex; flex-direction: column; gap: 10px;
  overflow: hidden;
  min-height: 190px; /* 使按钮在电脑端更易底部对齐 */
}
.hub-card .tag { font-size: 12px; color: var(--muted); }
.hub-header { display: flex; align-items: center; gap: 10px; }
.hub-icon { font-size: 22px; }
.hub-title { font-family: 'Noto Serif SC', serif; font-size: 18px; margin: 0; }
.hub-desc { color: var(--muted); font-size: 14px; line-height: 1.7; }
.hub-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: auto; justify-content: flex-start; }
.hub-actions .btn { font-size: 14px; padding: 6px 10px; min-width: 84px; text-align: center; }
.hub-card--green { background: #f0fff4; border-color: rgba(72, 187, 120, 0.28); box-shadow: 0 12px 30px rgba(72, 187, 120, 0.16); }
.hub-card--green .hub-title { color: #166534; }
.hub-card--green .hub-icon { color: #22c55e; }
.dark .hub-card--green { background: rgba(34, 197, 94, 0.12); border-color: rgba(72, 187, 120, 0.35); }
.dark .hub-card--green .hub-title { color: #86efac; }
.hub-decor {
  position: absolute; right: -40px; bottom: -40px; width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(226,154,127,0.25), rgba(226,154,127,0.06) 60%, transparent 70%);
  filter: blur(8px);
  border-radius: 50%;
}

@media (max-width: 860px) {
  .hub-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .hub-grid { grid-template-columns: 1fr; }
}

/* 动态背景：可复用的环境光层 */
.bg-canvas { position: fixed; inset: 0; z-index: -2; pointer-events: none; }
.with-ambient { position: relative; z-index: 0; }
.with-ambient::before {
  content: "";
  position: absolute;
  inset: -60px;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(
    circle at var(--ambient-pos, 40% 60%),
    rgba(var(--ambient-rgb), var(--ambient-strong-alpha)),
    rgba(var(--ambient-rgb), var(--ambient-weak-alpha)) 60%,
    transparent 70%
  );
  filter: blur(12px);
  transform: translate3d(0,0,0) scale(1);
  animation: ambientFloat 28s ease-in-out infinite alternate;
  opacity: 0.88;
  transition: opacity 420ms ease, filter 420ms ease, transform 420ms ease;
}

/* 不同板块的环境光位置 */
.ambient-hero     { --ambient-pos: 35% 45%; }
.ambient-hub      { --ambient-pos: 75% 75%; }
.ambient-featured { --ambient-pos: 20% 80%; }
.ambient-updates  { --ambient-pos: 80% 20%; }
.ambient-about    { --ambient-pos: 50% 12%; }
.ambient-contact  { --ambient-pos: 12% 50%; }

/* 为各页面设置略有差异的温馨环境光（提升差异化但保持统一） */
.ambient-hero     { --ambient-rgb: 226, 154, 127; --ambient-strong-alpha: 0.22; --ambient-weak-alpha: 0.08; }
.ambient-hub      { --ambient-rgb: 220, 145, 115; --ambient-strong-alpha: 0.20; --ambient-weak-alpha: 0.07; }
.ambient-featured { --ambient-rgb: 232, 168, 138; --ambient-strong-alpha: 0.24; --ambient-weak-alpha: 0.08; }
.ambient-updates  { --ambient-rgb: 210, 140, 115; --ambient-strong-alpha: 0.18; --ambient-weak-alpha: 0.06; }
.ambient-about    { --ambient-rgb: 218, 158, 128; --ambient-strong-alpha: 0.20; --ambient-weak-alpha: 0.07; }
.ambient-contact  { --ambient-rgb: 205, 135, 110; --ambient-strong-alpha: 0.16; --ambient-weak-alpha: 0.06; }

/* 深夜模式下略收敛环境光强度，保持可读性 */
.dark .ambient-featured { --ambient-strong-alpha: 0.20; --ambient-weak-alpha: 0.06; }
.dark .ambient-hero     { --ambient-strong-alpha: 0.18; --ambient-weak-alpha: 0.06; }

/* 动画定义 */
@keyframes ambientFloat {
  0%   { transform: translateY(-6px) scale(1.02); filter: blur(12px); }
  50%  { transform: translateY(6px)  scale(1.00); filter: blur(14px); }
  100% { transform: translateY(-4px) scale(1.01); filter: blur(12px); }
}

@keyframes bg-pan {
  0%   { background-position: 0% 0%; }
  50%  { background-position: 50% 60%; }
  100% { background-position: 100% 100%; }
}

/* 常用元素在主题切换时的平滑过渡 */
.site-header, .card, .nav a, .btn, .featured-card, .hub-card, .update-item, .about-content, .contact-content {
  transition: color 280ms ease, background-color 280ms ease, border-color 280ms ease, box-shadow 280ms ease;
}

/* 切换瞬间提升环境光柔和度，作为视觉缓冲 */
.theme-switching .with-ambient::before { opacity: 0.96; filter: blur(16px); }