/*
# Student Data System - Modern CSS
# Developer: MiniusSoft Ltd
# VS Code Light Theme Inspired
*/

:root {
    --primary-blue: #007ACC;
    --light-blue: #E6F2FF;
    --dark-blue: #005A9E;
    --gray-50: #F8F9FA;
    --gray-100: #F1F3F4;
    --gray-200: #E8EAED;
    --gray-300: #DADCE0;
    --gray-400: #BDC1C6;
    --gray-500: #9AA0A6;
    --gray-600: #80868B;
    --gray-700: #5F6368;
    --gray-800: #3C4043;
    --gray-900: #202124;
    --white: #FFFFFF;
    --success: #34A853;
    --warning: #FBBC04;
    --error: #EA4335;
    --border-radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
}

/* Layout Structure */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.logo i {
    font-size: 2rem;
    background: var(--white);
    color: var(--primary-blue);
    padding: 0.5rem;
    border-radius: var(--border-radius);
}


.nav-menu {
    overflow-y: scroll;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.nav-menu::-webkit-scrollbar {
    display: none;
}

::-webkit-scrollbar {display: none;}

.card {
  display: flex;
  flex-direction: column;
  /* no fixed height */
  min-height: 100px; /* optional, just to avoid super tiny cards */
}

.card-body {
  flex-grow: 1; /* take all available space */
}

.card-footer {
  margin-top: auto; /* push footer to bottom */
  border-top: 1px solid #dee2e6; /* optional styling */
  padding: 1rem 1.5rem;
  background-color: #f8f9fa; /* optional */
}


.nav-item {
    margin: 0.25rem 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition);
    border-right: 3px solid transparent;
    position: relative;
}

.nav-link:hover {
    background: linear-gradient(90deg, var(--light-blue), transparent);
    color: var(--primary-blue);
    border-right-color: var(--primary-blue);
}

.nav-link.active {
    background: linear-gradient(90deg, var(--light-blue), transparent);
    color: var(--primary-blue);
    border-right-color: var(--primary-blue);
    font-weight: 600;
}

.nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    transition: var(--transition);
}

.main-content.expanded {
    margin-left: 0;
}

.top-bar {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-600);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--gray-100);
    color: var(--primary-blue);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-600);
    font-size: 0.9rem;
}

.breadcrumb i {
    color: var(--primary-blue);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray-700);
    background: var(--gray-50);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
}

/* Content Area */
.content {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.page-header {
    margin-bottom: 2rem;
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-blue);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--gray-600);
    font-size: 1.1rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: var(--transition);
    margin-bottom: 1.5rem;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--gray-50), var(--white));
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.card-subtitle {
    color: var(--gray-600);
    font-size: 0.9rem;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-blue);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--light-blue), transparent);
    border-radius: 0 0 0 100px;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.stat-label {
    color: var(--gray-600);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.stat-icon {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2.5rem;
    color: var(--primary-blue);
    opacity: 0.3;
    z-index: 0;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    transition: var(--transition);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.1);
}

.form-control:disabled {
    background: var(--gray-100);
    color: var(--gray-500);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.form-text {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    line-height: 1;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    color: var(--white);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
    transform: translateY(-2px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #2d8f47);
    color: var(--white);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning), #e6a700);
    color: var(--gray-800);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error), #d33b2c);
    color: var(--white);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 1.25rem 2rem;
    font-size: 1.1rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    max-height: 80vh!important;
    /* padding: 20px; */
    overflow-y: auto!important;
    overflow-x: auto!important;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: linear-gradient(135deg, var(--gray-50), var(--white));
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
    z-index: 10;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background: var(--light-blue);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background: rgba(52, 168, 83, 0.1);
    color: var(--success);
    border: 1px solid rgba(52, 168, 83, 0.2);
}

.badge-warning {
    background: rgba(251, 188, 4, 0.1);
    color: var(--warning);
    border: 1px solid rgba(251, 188, 4, 0.2);
}

.badge-danger {
    background: rgba(234, 67, 53, 0.1);
    color: var(--error);
    border: 1px solid rgba(234, 67, 53, 0.2);
}

.badge-info {
    background: rgba(0, 122, 204, 0.1);
    color: var(--primary-blue);
    border: 1px solid rgba(0, 122, 204, 0.2);
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-success {
    background: rgba(52, 168, 83, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-warning {
    background: rgba(251, 188, 4, 0.1);
    border-color: var(--warning);
    color: var(--warning);
}

.alert-danger {
    background: rgba(234, 67, 53, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.alert-info {
    background: rgba(0, 122, 204, 0.1);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-50px);
    transition: var(--transition);
    box-shadow: var(--shadow-hover);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--gray-50), var(--white));
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--error);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    background: var(--gray-50);
}

/* Student Photo */
.student-photo {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--gray-200);
}

.file-upload-wrapper {
  position: relative;
  display: inline-block;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 0.9rem;
  color: #333;
}

/* Hide native input but keep it accessible */
.file-upload-wrapper input[type="file"] {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Styled label to look like a button */
.file-upload-wrapper label {
  display: inline-block;
  background-color: #007bff; /* Bootstrap primary blue */
  color: white;
  padding: 0.5em 1em;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s ease;
  border: 1px solid transparent;
  font-weight: 600;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Hover and focus states */
.file-upload-wrapper label:hover,
.file-upload-wrapper label:focus {
  background-color: #0056b3;
  outline: none;
  border-color: #004085;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

/* Disabled state (if you ever want it) */
.file-upload-wrapper input[type="file"]:disabled + label {
  background-color: #6c757d;
  cursor: not-allowed;
  box-shadow: none;
  border-color: #6c757d;
  color: #e2e6ea;
}

.student-photo-placeholder {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gray-200), var(--gray-300));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    font-size: 1.2rem;
}

/* Login Page Specific */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.login-card {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-hover);
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    font-size: 4rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.login-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.login-subtitle {
    color: var(--gray-600);
    font-size: 1rem;
}

.developer-info {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
    font-size: 0.8rem;
    color: var(--gray-500);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .content {
        padding: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .user-info span:not(.user-avatar) {
        display: none;
    }
    
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .table-container {
        font-size: 0.8rem;
    }
    
    .table th,
    .table td {
        padding: 0.75rem 0.5rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .login-card {
        padding: 2rem;
        margin: 1rem;
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }
    
    .stat-card {
        padding: 1.5rem;
    }
    
    .stat-value {
        font-size: 2rem;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--gray-500); }
.text-primary { color: var(--primary-blue); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--error); }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 2rem; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.align-items-center { align-items: center; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 122, 204, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-blue);
    animation: spin 1s ease-in-out infinite;
}

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

/* Notification */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    min-width: 300px;
    max-width: 500px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Print styles */
@media print {
    .sidebar, .top-bar, .no-print {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0 !important;
    }
    
    .content {
        padding: 0 !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
    
    .page-break {
        page-break-before: always;
    }
}