/* 前端完全重构 - 现代卡片式暖色调设计 */

/* ==================== CSS变量 ==================== */
:root {
  --primary-orange: #FF6B35;
  --primary-orange-light: #FF8C5A;
  --primary-orange-dark: #E55A2B;
  --primary-red: #E63946;
  --primary-yellow: #FFD700;
  --primary-yellow-light: #FFC107;
  --bg-light: #FFF5E6;
  --bg-light-alt: #FFE5CC;
  --bg-white: #FFFFFF;
  --text-dark: #2C2C2C;
  --text-dark-light: #4A4A4A;
  --text-light: rgba(44, 44, 44, 0.7);
  --shadow-orange: rgba(255, 107, 53, 0.2);
  --shadow-orange-light: rgba(255, 107, 53, 0.1);
  --border-orange: rgba(255, 107, 53, 0.3);
  --border-radius: 16px;
  --border-radius-small: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 基础重置 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-light-alt) 100%);
  color: var(--text-dark);
  line-height: 1.6;
  min-height: 100vh;
  padding-top: 70px; /* 为固定导航栏留出空间 */
}

/* ==================== 顶部导航栏 ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, var(--primary-orange) 0%, var(--primary-orange-dark) 100%);
  box-shadow: 0 4px 20px var(--shadow-orange);
  z-index: 1000;
  padding: 0 20px;
}

.navbar-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-brand {
  font-size: 24px;
  font-weight: 700;
  color: var(--bg-white);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand:hover {
  opacity: 0.9;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.navbar-btn {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-small);
  color: var(--bg-white);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.navbar-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

.navbar-btn.active {
  background: var(--bg-white);
  color: var(--primary-orange);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--bg-white);
  font-size: 24px;
  cursor: pointer;
  padding: 5px;
}

/* ==================== 主容器 ==================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 30px 20px;
}

/* ==================== 卡片网格布局 ==================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-bottom: 25px;
}

.cards-grid-large {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* ==================== 卡片组件 ==================== */
.card {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: 0 4px 20px var(--shadow-orange-light);
  transition: var(--transition);
  border: 2px solid transparent;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px var(--shadow-orange);
  border-color: var(--border-orange);
}

.card-primary {
  border: 2px solid var(--primary-orange);
  box-shadow: 0 4px 20px var(--shadow-orange);
}

.card-info {
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.1) 0%, rgba(255, 140, 90, 0.1) 100%);
  border: 2px solid var(--border-orange);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 2px solid rgba(255, 107, 53, 0.1);
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-orange);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-body {
  color: var(--text-dark-light);
}

/* ==================== 奖励卡片 ==================== */
.reward-card {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--primary-orange) 0%, var(--primary-orange-light) 100%);
  color: var(--bg-white);
  text-align: center;
  padding: 40px;
}

.reward-card .card-title {
  color: var(--bg-white);
  justify-content: center;
  border-bottom-color: rgba(255, 255, 255, 0.3);
}

.reward-amount {
  font-size: 64px;
  font-weight: 800;
  margin: 20px 0;
  text-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.reward-label {
  font-size: 18px;
  opacity: 0.9;
}

/* ==================== 按钮 ==================== */
.btn {
  padding: 14px 28px;
  border: none;
  border-radius: var(--border-radius-small);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-orange) 0%, var(--primary-orange-light) 100%);
  color: var(--bg-white);
  box-shadow: 0 4px 15px var(--shadow-orange);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-orange);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--primary-orange);
  border: 2px solid var(--primary-orange);
}

.btn-secondary:hover {
  background: var(--primary-orange);
  color: var(--bg-white);
}

.btn-full {
  width: 100%;
}

/* ==================== 表单 ==================== */
.form-group {
  margin-bottom: 25px;
}

.form-label {
  display: block;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-weight: 600;
  font-size: 15px;
}

.form-label .required {
  color: var(--primary-red);
  margin-left: 3px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-light);
  border: 2px solid var(--border-orange);
  border-radius: var(--border-radius-small);
  color: var(--text-dark);
  font-size: 15px;
  font-family: inherit;
  transition: var(--transition);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-orange);
  background: var(--bg-white);
  box-shadow: 0 0 0 4px var(--shadow-orange-light);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.form-hint {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 6px;
}

/* ==================== Tab切换 ==================== */
.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  border-bottom: 2px solid rgba(255, 107, 53, 0.1);
}

.tab-btn {
  padding: 10px 20px;
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-light);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active {
  color: var(--primary-orange);
  border-bottom-color: var(--primary-orange);
}

.tab-btn:hover:not(.active) {
  color: var(--text-dark);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ==================== Markdown预览 ==================== */
.markdown-preview {
  background: var(--bg-light);
  border: 2px solid var(--border-orange);
  border-radius: var(--border-radius-small);
  padding: 20px;
  min-height: 100px;
  color: var(--text-dark-light);
  line-height: 1.8;
}

.markdown-preview:empty::before {
  content: '预览区域（支持 Markdown 和 LaTeX 公式）';
  color: var(--text-light);
  font-style: italic;
}

.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3 {
  color: var(--primary-orange);
  margin-top: 20px;
  margin-bottom: 10px;
}

.markdown-preview code {
  background: rgba(255, 107, 53, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--primary-orange-dark);
  font-family: 'Consolas', monospace;
}

.markdown-preview pre {
  background: var(--bg-light);
  padding: 15px;
  border-radius: var(--border-radius-small);
  overflow-x: auto;
  margin: 10px 0;
  border: 1px solid var(--border-orange);
}

.markdown-preview pre code {
  background: none;
  padding: 0;
}

/* ==================== 消息提示 ==================== */
.message {
  padding: 20px;
  border-radius: var(--border-radius-small);
  margin-top: 20px;
  display: none;
  animation: slideIn 0.5s ease-out;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.message.show {
  display: block;
}

.message-success {
  background: rgba(76, 175, 80, 0.1);
  border: 2px solid rgba(76, 175, 80, 0.5);
  color: #4caf50;
}

.message-error {
  background: rgba(230, 57, 70, 0.1);
  border: 2px solid rgba(230, 57, 70, 0.5);
  color: var(--primary-red);
}

.message h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

/* ==================== 模态框 ==================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 2000;
  overflow-y: auto;
  padding: 20px;
  backdrop-filter: blur(5px);
}

.modal.show {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.modal-content {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  padding: 30px;
  max-width: 900px;
  width: 100%;
  margin: 50px auto;
  box-shadow: 0 10px 50px rgba(0, 0, 0, 0.3);
  position: relative;
  animation: modalSlideIn 0.3s ease-out;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 2px solid rgba(255, 107, 53, 0.1);
}

.modal-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-orange);
}

.modal-close {
  background: none;
  border: none;
  font-size: 32px;
  color: var(--text-light);
  cursor: pointer;
  padding: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-light);
  color: var(--primary-orange);
}

/* ==================== 动画 ==================== */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeInUp 0.5s ease-out;
}

/* ==================== 隐藏类 ==================== */
.hidden {
  display: none !important;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1200px) {
  .reward-card {
    grid-column: span 1;
  }
  
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 60px;
  }
  
  .navbar-container {
    height: 60px;
  }
  
  .navbar-brand {
    font-size: 20px;
  }
  
  .navbar-actions {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .container {
    padding: 20px 15px;
  }
  
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .reward-card {
    padding: 30px 20px;
  }
  
  .reward-amount {
    font-size: 48px;
  }
  
  .card {
    padding: 20px;
  }
  
  .modal-content {
    padding: 20px;
    margin: 20px auto;
  }
}

@media (max-width: 480px) {
  .navbar-brand {
    font-size: 18px;
  }
  
  .card-title {
    font-size: 18px;
  }
  
  .reward-amount {
    font-size: 36px;
  }
}