/* ========================================
   悠行动漫社内网 - 全局样式
   新海诚风格：深邃天空 · 流光渐变
   ======================================== */

/* ---- CSS变量 ---- */
:root {
  --primary: #5B8FD4;
  --primary-dark: #3A6CB8;
  --accent: #FF9B7A;
  --accent-2: #A8D5FF;
  --sky-top: #0a1628;
  --sky-mid: #1a3a6e;
  --sky-glow: #2d6bc4;
  --text-main: #e8f4ff;
  --text-muted: #8bb3d4;
  --card-bg: rgba(10, 25, 60, 0.72);
  --card-border: rgba(91, 143, 212, 0.25);
  --glass-bg: rgba(20, 50, 100, 0.55);
  --nav-height: 64px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0, 20, 80, 0.5);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  background: var(--sky-top);
  color: var(--text-main);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--sky-top); }
::-webkit-scrollbar-thumb { background: var(--sky-glow); border-radius: 3px; }

/* ---- 导航栏 ---- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(8, 18, 45, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(91, 143, 212, 0.15);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 12px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  height: 36px;
  filter: drop-shadow(0 0 8px rgba(91, 143, 212, 0.6));
}

.nav-logo span {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.03em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin-left: auto;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
  background: rgba(91, 143, 212, 0.2);
}

/* 汉堡菜单（移动端） */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  margin-left: auto;
  padding: 8px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 页面主体 ---- */
.page-wrapper {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

/* ---- 背景星空/光效 ---- */
.bg-stars {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(45, 107, 196, 0.4) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(168, 100, 255, 0.12) 0%, transparent 55%),
    linear-gradient(180deg, #050e1f 0%, #0a1628 40%, #060f22 100%);
}

/* 动态粒子（纯CSS星星） */
.bg-stars::before {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  background-image:
    radial-gradient(1px 1px at 15% 20%, rgba(255,255,255,0.7) 0%, transparent 100%),
    radial-gradient(1px 1px at 35% 8%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 55% 30%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 70% 15%, rgba(168, 213, 255, 0.8) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 25%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 50%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 65% 60%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 45% 75%, rgba(168, 213, 255, 0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 50%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 10% 70%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 78% 85%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 20% 88%, rgba(255,255,255,0.4) 0%, transparent 100%);
}

/* ---- 通用卡片 ---- */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  border-color: rgba(91, 143, 212, 0.5);
  box-shadow: 0 12px 40px rgba(0, 30, 100, 0.6), 0 0 0 1px rgba(91, 143, 212, 0.2);
  transform: translateY(-2px);
}

/* ---- 通用标题区 ---- */
.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #e8f4ff 0%, #a8d5ff 50%, #7bb3f8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---- 通用按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 20px rgba(91, 143, 212, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(91, 143, 212, 0.6);
}

.btn-ghost {
  background: rgba(91, 143, 212, 0.12);
  color: var(--text-main);
  border: 1px solid rgba(91, 143, 212, 0.3);
}

.btn-ghost:hover {
  background: rgba(91, 143, 212, 0.25);
  border-color: rgba(91, 143, 212, 0.6);
}

/* ---- 标签 ---- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(91, 143, 212, 0.15);
  color: var(--accent-2);
  border: 1px solid rgba(91, 143, 212, 0.2);
}

/* ---- 页脚 ---- */
.footer {
  position: relative;
  z-index: 10;
  margin-top: 80px;
  padding: 40px 24px;
  border-top: 1px solid rgba(91, 143, 212, 0.15);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer a { color: var(--primary); text-decoration: none; }

/* ---- 加载动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.fade-in {
  animation: fadeInUp 0.6s ease both;
}

/* ---- 模态框 ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 5, 20, 0.85);
  backdrop-filter: blur(8px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-box {
  background: linear-gradient(145deg, rgba(12, 28, 70, 0.98) 0%, rgba(8, 18, 50, 0.98) 100%);
  border: 1px solid rgba(91, 143, 212, 0.35);
  border-radius: var(--radius);
  max-width: 600px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
  animation: fadeInUp 0.3s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(91, 143, 212, 0.15);
}

.modal-body { padding: 24px; }

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: var(--transition);
  line-height: 1;
}

.modal-close:hover { color: var(--text-main); background: rgba(255,255,255,0.08); }

/* ---- 响应式 ---- */
@media (max-width: 768px) {
  :root { --nav-height: 56px; }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    background: rgba(8, 18, 45, 0.97);
    backdrop-filter: blur(20px);
    padding: 16px;
    flex-direction: column;
    border-bottom: 1px solid rgba(91, 143, 212, 0.2);
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
  }

  .nav-toggle { display: flex; }
}

@media (max-width: 480px) {
  .modal-box { max-height: 90vh; }
}