/* Clean, Mobile-First Styles */
:root {
  /* Colors with better contrast */
  --primary: #0052cc;
  --primary-dark: #003d99;
  --primary-light: #4d88ff;
  --secondary: #00875a;
  --secondary-dark: #006644;
  --success: #36b37e;
  --danger: #de350b;
  --warning: #ff991f;
  --info: #0065ff;
  --dark: #172b4d;
  --light: #f4f5f7;
  --white: #ffffff;
  --gray: #6b778c;
  --gray-light: #dfe1e6;
  --gray-dark: #253858;
  --body-bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #172b4d;
  --text-light: #5e6c84;
  --text-white: #ffffff;
  --border: #dfe1e6;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background-color: var(--body-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.2;
  color: var(--dark);
}

/* Container */
.container {
  width: 100%;
  padding: var(--spacing-md);
  margin: 0 auto;
  max-width: 1200px;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text);
}

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--white);
  color: var(--text);
  font-size: 1rem;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--primary);
  color: var(--text-white);
  border: none;
  min-height: 40px;
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  min-height: 32px;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.125rem;
  min-height: 48px;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: var(--spacing-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
  text-align: left;
}

th {
  background: var(--light);
  font-weight: 600;
  color: var(--text);
}

/* Navigation */
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.nav-item {
  list-style: none;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius);
  transition: var(--transition);
}

.nav-link:hover {
  background: var(--light);
  color: var(--primary);
}

.nav-link.active {
  background: var(--primary);
  color: var(--text-white);
}

/* Mobile Navigation */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--white);
  box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
  padding: var(--spacing-sm);
  z-index: 1000;
}

/* Utilities */
.d-flex { display: flex !important; }
.flex-wrap { flex-wrap: wrap !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }
.text-center { text-align: center !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.p-3 { padding: var(--spacing-md) !important; }

/* Responsive Design */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .bottom-nav {
    display: flex;
    justify-content: space-around;
  }
  
  .content {
    margin-bottom: 60px; /* Space for bottom nav */
  }
  
  .table-responsive {
    margin: 0 -1rem;
    padding: 0 1rem;
  }
  
  .btn {
    width: 100%;
  }
  
  .d-sm-none {
    display: none !important;
  }
}

/* Teacher Subjects Page */
.assignments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: 2rem !important;
}

.assignment-card {
    background: var(--white) !important;
    border-radius: var(--radius) !important;
    padding: 1.5rem !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1) !important;
    transition: transform 0.2s !important;
}

.assignment-card:hover {
    transform: translateY(-2px) !important;
}

.teacher-section {
    background: var(--light) !important;
    border-radius: var(--radius) !important;
    padding: 1.5rem !important;
    margin-bottom: 2rem !important;
}

.teacher-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    margin-bottom: 1rem !important;
    padding-bottom: 1rem !important;
    border-bottom: 1px solid var(--border) !important;
}

.score-count {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    margin-top: 1rem !important;
    padding-top: 1rem !important;
    border-top: 1px solid var(--border) !important;
    color: var(--text-light) !important;
}

.modal-content {
    background: var(--white) !important;
    border-radius: var(--radius) !important;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1) !important;
}

/* Offline Status Styles */
.offline-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    display: none;
    align-items: center;
    gap: 8px;
    z-index: 1000;
    font-size: 14px;
}

body.offline .offline-indicator {
    display: flex;
}

.pending-sync-status {
    margin: 10px 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: #4A90E2;
    color: white;
}

.btn-primary:hover {
    background-color: #357ABD;
}

/* Offline Page Specific Styles */
.offline-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    text-align: center;
}

.offline-icon {
    font-size: 4rem;
    color: #4A90E2;
    margin-bottom: 1rem;
}

.offline-message {
    margin-bottom: 2rem;
}

.offline-features {
    text-align: left;
    background: rgba(74, 144, 226, 0.1);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
}

.feature-list i {
    color: #4A90E2;
}

/* Responsive fixes */
@media (max-width: 768px) {
    .assignments-grid {
        grid-template-columns: 1fr !important;
    }
    
    .teacher-header {
        flex-direction: column !important;
        text-align: center !important;
        gap: 1rem !important;
    }
}
 .navbar {
            background-color: #fff;
            box-shadow: 0 2px 4px rgba(0,0,0,.08);
        }
        .navbar-brand {
            font-weight: 600;
        }
        .stat-card {
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0,0,0,.04);
            transition: transform 0.2s;
            height: 100%;
        }
        .stat-card:hover {
            transform: translateY(-5px);
        }
        .stat-icon {
            font-size: 2rem;
            opacity: 0.8;
        }
        .menu-card {
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0,0,0,.04);
            transition: all 0.3s;
            text-decoration: none;
            color: #212529;
            height: 100%;
        }
        .menu-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,.08);
            color: #0d6efd;
        }
        .menu-icon {
            font-size: 1.8rem;
            margin-bottom: 10px;
        }
        .school-info {
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0,0,0,.04);
        }
        .school-logo {
            max-height: 60px;
            max-width: 100%;
        }
        .bottom-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: white;
            box-shadow: 0 -2px 10px rgba(0,0,0,.1);
            z-index: 1000;
            display: none;
        }
        @media (max-width: 768px) {
            .bottom-nav {
                display: flex;
            }
            .container {
                margin-bottom: 70px;
            }
        }
        .navbar {
          background-color: #fff;
          box-shadow: 0 2px 4px rgba(0,0,0,.08);
      }
      .navbar-brand {
          font-weight: 600;
      }
      .stat-card {
          border-radius: 10px;
          box-shadow: 0 4px 6px rgba(0,0,0,.04);
          transition: transform 0.2s;
          height: 100%;
      }
      .stat-card:hover {
          transform: translateY(-5px);
      }
      .stat-icon {
          font-size: 2rem;
          opacity: 0.8;
      }
      .menu-card {
          border-radius: 10px;
          box-shadow: 0 4px 6px rgba(0,0,0,.04);
          transition: all 0.3s;
          text-decoration: none;
          color: #212529;
          height: 100%;
      }
      .menu-card:hover {
          transform: translateY(-3px);
          box-shadow: 0 6px 12px rgba(0,0,0,.08);
          color: #0d6efd;
      }
      .menu-icon {
          font-size: 1.8rem;
          margin-bottom: 10px;
      }
      .school-info {
          background-color: #fff;
          border-radius: 10px;
          box-shadow: 0 4px 6px rgba(0,0,0,.04);
      }
      .school-logo {
          max-height: 60px;
          max-width: 100%;
      }
      .bottom-nav {
          position: fixed;
          bottom: 0;
          left: 0;
          right: 0;
          background: white;
          box-shadow: 0 -2px 10px rgba(0,0,0,.1);
          z-index: 1000;
          display: none;
      }
      @media (max-width: 768px) {
          .bottom-nav {
              display: flex;
          }
          .container {
              margin-bottom: 70px;
          }
      }