/* 引入 Google Fonts 提升排版档次 */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --font-title: 'Outfit', 'Inter', -apple-system, sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;

  /* 配色方案 (Premium Light Mode) */
  --bg-main: #f8fafc;        /* 极浅灰蓝 */
  --bg-card: #ffffff;        /* 纯白卡片 */
  --border-color: #e2e8f0;   /* 极细边框 */
  --text-main: #0f172a;      /* 深灰字 */
  --text-muted: #64748b;     /* 中灰字 */
  --primary: #0ea5e9;        /* 科技蓝 */
  --primary-hover: #0284c7;
  --success: #10b981;        /* 活力绿 */
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.04), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================== */
/* 登录界面样式                                */
/* ========================================== */

.login-container {
  display: flex;
  flex-grow: 1;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(circle at 50% 50%, #f1f5f9 0%, #f8fafc 100%);
}

.login-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 440px;
  padding: 40px;
  transition: var(--transition-smooth);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  font-size: 3rem;
  margin-bottom: 12px;
  display: inline-block;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.login-header h1 {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.login-header p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 6px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.input-wrapper {
  position: relative;
}

.input-wrapper input {
  width: 100%;
  padding: 14px 16px;
  font-size: 0.95rem;
  background-color: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  outline: none;
  font-family: var(--font-body);
  transition: var(--transition-smooth);
}

.input-wrapper input:focus {
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.12);
}

.login-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary) 0%, #06b6d4 100%);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-title);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.2);
  transition: var(--transition-smooth);
}

.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.3);
}

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

.error-message {
  background-color: #fef2f2;
  border: 1px solid #fee2e2;
  color: #ef4444;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.9rem;
  margin-bottom: 20px;
  display: none;
  align-items: center;
  gap: 8px;
}

/* ========================================== */
/* 面板主界面样式                              */
/* ========================================== */

.panel-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background-color: rgba(255, 255, 255, 0.85);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  font-size: 1.8rem;
}

.brand-name {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-badge {
  background-color: #f1f5f9;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 500;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 20px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e0f2fe 0%, #dcfce7 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--primary);
  border: 1px solid #bae6fd;
}

.logout-btn {
  background-color: transparent;
  border: 1px solid #cbd5e1;
  color: var(--text-muted);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.logout-btn:hover {
  background-color: #f1f5f9;
  color: #ef4444;
  border-color: #fca5a5;
}

.main-content {
  flex-grow: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 40px;
}

.welcome-section {
  margin-bottom: 40px;
}

.welcome-section h2 {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.welcome-section p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-top: 8px;
}

/* 网格系统卡片 */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 28px;
}

.system-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  height: 250px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.system-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: var(--card-color, var(--primary));
  opacity: 0.8;
  transition: var(--transition-smooth);
}

.system-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--card-color, var(--primary));
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.card-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-color: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  transition: var(--transition-smooth);
}

.system-card:hover .card-icon-wrapper {
  transform: scale(1.1) rotate(-3deg);
  background-color: #e0f2fe;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  background-color: #f8fafc;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.system-card h3 {
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.2px;
}

.system-card p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
  flex-grow: 1;
}

.card-footer {
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--card-color, var(--primary));
  opacity: 0;
  transform: translateX(-10px);
  transition: var(--transition-smooth);
}

.system-card:hover .card-footer {
  opacity: 1;
  transform: translateX(0);
}

.card-footer-arrow {
  margin-left: 4px;
  transition: var(--transition-smooth);
}

.system-card:hover .card-footer-arrow {
  transform: translateX(4px);
}

/* ========================================== */
/* 底部 Footer 样式                            */
/* ========================================== */

.panel-footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 24px 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: auto;
}

.panel-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.panel-footer a:hover {
  text-decoration: underline;
}

/* ========================================== */
/* 响应式适配                                  */
/* ========================================== */

@media (max-width: 768px) {
  .panel-header {
    padding: 16px 20px;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  .user-profile {
    width: 100%;
    justify-content: space-between;
  }
  .main-content {
    padding: 30px 20px;
  }
  .welcome-section h2 {
    font-size: 1.8rem;
  }
}