/* ============================================
   星核·学业深空导航仪 — 共享样式表
   配色方案：UI 设计师 小染
   ============================================ */

/* --- CSS 自定义属性（主题色） --- */
:root {
  /* 主色调 palette */
  --color-bg: #0B0B1A;
  --color-purple: #3D1E6D;
  --color-blue: #1B7FE0;
  --color-white: #F8F0E3;

  /* 衍生色 */
  --color-bg-card: rgba(11, 11, 26, 0.85);
  --color-border: rgba(61, 30, 109, 0.6);
  --color-glow-blue: rgba(27, 127, 224, 0.5);
  --color-glow-purple: rgba(61, 30, 109, 0.5);
  --color-text-primary: #F8F0E3;
  --color-text-secondary: #B8B0D0;
  --color-text-muted: #7A7A9A;
  --color-success: #4ADE80;
  --color-warning: #FBBF24;
  --color-danger: #F87171;

  /* 地形色 */
  --color-crystal: #7B2FBE;
  --color-lava: #8B1A1A;
  --color-lava-gold: #FF8C00;
  --color-ice: #A8D8EA;
  --color-island: #5D8C4A;

  /* 间距 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 字体 */
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;

  /* 过渡 */
  --transition-fast: 0.2s ease-out;
  --transition-normal: 0.4s ease-out;
  --transition-slow: 0.6s ease-out;
}

/* --- 全局重置 --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  /* 常驻背景粒子由 JS 绘制 */
}

/* --- 滚动条美化 --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-purple);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-blue);
}

/* --- 链接 --- */
a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-white);
  text-shadow: 0 0 8px var(--color-white);
}

/* --- 标题渐变文字效果 --- */
.gradient-text {
  background: linear-gradient(135deg, var(--color-blue), var(--color-purple), var(--color-white));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* --- 导航栏 --- */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  background: rgba(11, 11, 26, 0.9);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-bar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-bar .logo .emoji {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-white);
  text-shadow: 0 0 6px var(--color-blue);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--color-blue);
  border-radius: 1px;
  box-shadow: 0 0 8px var(--color-glow-blue);
}

/* --- 卡片组件 --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.card:hover {
  border-color: var(--color-purple);
  box-shadow: 0 0 20px var(--color-glow-purple);
  transform: translateY(-2px);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* --- 按钮组件 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-stack);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-blue), var(--color-purple));
  color: var(--color-white);
  box-shadow: 0 4px 20px var(--color-glow-blue);
}

.btn-primary:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 30px var(--color-glow-blue);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-blue);
  border: 1px solid var(--color-blue);
}

.btn-secondary:hover {
  background: rgba(27, 127, 224, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 0 20px var(--color-glow-blue);
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-danger), #B91C1C);
  color: var(--color-white);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(248, 113, 113, 0.4);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* --- 输入框 --- */
.input-field {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: rgba(11, 11, 26, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: 0.95rem;
  font-family: var(--font-stack);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.input-field:focus {
  border-color: var(--color-blue);
  box-shadow: 0 0 12px var(--color-glow-blue);
}

.input-field::placeholder {
  color: var(--color-text-muted);
}

/* --- 进度条 --- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(61, 30, 109, 0.3);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-purple));
  transition: width var(--transition-slow);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 20px;
  height: 100%;
  background: rgba(248, 240, 227, 0.3);
  filter: blur(4px);
}

/* --- 标签/徽章 --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-blue {
  background: rgba(27, 127, 224, 0.2);
  color: var(--color-blue);
  border: 1px solid rgba(27, 127, 224, 0.3);
}

.badge-purple {
  background: rgba(61, 30, 109, 0.2);
  color: var(--color-purple);
  border: 1px solid rgba(61, 30, 109, 0.3);
}

.badge-success {
  background: rgba(74, 222, 128, 0.2);
  color: var(--color-success);
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.badge-warning {
  background: rgba(251, 191, 36, 0.2);
  color: var(--color-warning);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

/* --- 网格布局 --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

/* --- 弹性布局工具 --- */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* --- 页面容器 --- */
.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

/* --- 粒子容器（背景） --- */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 所有内容在粒子之上 */
.page-container,
.nav-bar {
  position: relative;
  z-index: 1;
}

/* --- 全屏特效遮罩（学分消费时） --- */
.effect-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 999;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-slow);
  background: var(--color-bg);
}

.effect-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* --- 学分消费特效容器 --- */
#credit-effect-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  pointer-events: none;
  display: none;
}

#credit-effect-container.active {
  display: block;
  pointer-events: auto;
}

/* --- Toast 消息 --- */
.toast {
  position: fixed;
  top: 80px;
  right: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-size: 0.9rem;
  z-index: 200;
  transform: translateX(120%);
  transition: transform var(--transition-normal);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  max-width: 360px;
}

.toast.show {
  transform: translateX(0);
}

.toast.success {
  border-color: var(--color-success);
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.3);
}

.toast.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 20px rgba(248, 113, 113, 0.3);
}

/* --- 模态框 --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(11, 11, 26, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 300;
  display: none;
  align-items: center;
  justify-content: center;
}

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

.modal-box {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-box h2 {
  margin-bottom: var(--space-lg);
  color: var(--color-white);
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .nav-bar {
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
  }

  .page-container {
    padding: var(--space-md);
  }

  .card {
    padding: var(--space-md);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --- 动画关键帧 --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

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

.fade-in {
  animation: fadeIn 0.6s ease-out forwards;
}

.float-anim {
  animation: float 3s ease-in-out infinite;
}