:root {
    --primary-color: #0EA5E9;
    --primary-dark: #0284C7;
    --primary-light: #38BDF8;
    --secondary-color: #06B6D4;
    --accent-color: #14B8A6;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --light-bg: #F0F9FF;
    --border-color: #BAE6FD;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --white: #FFFFFF;
    --shadow-sm: 0 1px 3px 0 rgba(14, 165, 233, 0.1), 0 1px 2px -1px rgba(14, 165, 233, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(14, 165, 233, 0.15), 0 2px 4px -2px rgba(14, 165, 233, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(14, 165, 233, 0.2), 0 4px 6px -4px rgba(14, 165, 233, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(14, 165, 233, 0.25), 0 8px 10px -6px rgba(14, 165, 233, 0.25);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #E0F2FE 0%, #DBEAFE 50%, #BFDBFE 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--primary-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform 0.3s;
}

.logo:hover {
    transform: scale(1.05);
}

.logo svg {
    width: 32px;
    height: 32px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    transition: all 0.3s;
    font-weight: 500;
    background: var(--light-bg);
    border: 2px solid transparent;
}

nav a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
    border-radius: 0 0 30px 30px;
    box-shadow: var(--shadow-xl);
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.75rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
}

/* Box Layout System */
.box {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
    margin-bottom: 2rem;
}

.box:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
    border-color: var(--primary-light);
}

.box-header {
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.box-header h2 {
    color: var(--primary-color);
    font-size: 1.75rem;
}

.box-header h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Column Layouts */
.columns {
    display: grid;
    gap: 2rem;
    margin-bottom: 2rem;
}

.columns-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.columns-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.columns-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.column {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.column:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

/* Main Content Area */
.main-content {
    min-height: 60vh;
}

/* Stats Cards */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.stat-card:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.stat-card h3 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.stat-card p {
    font-size: 1rem;
    opacity: 0.95;
    font-weight: 500;
}

/* Form Section */
.form-section {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    border: 3px solid var(--primary-color);
}

.form-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    border-bottom: 3px solid var(--primary-light);
    padding-bottom: 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.required {
    color: var(--danger-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
    background: var(--light-bg);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1);
    background: white;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
    font-family: inherit;
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

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

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* Feature Cards */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-md);
}

.feature-icon svg {
    width: 35px;
    height: 35px;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Alerts */
.alert {
    padding: 1.25rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    border-left: 5px solid;
    box-shadow: var(--shadow-sm);
}

.alert-success {
    background: #D1FAE5;
    border-color: var(--success-color);
    color: #065F46;
}

.alert-error {
    background: #FEE2E2;
    border-color: var(--danger-color);
    color: #991B1B;
}

.alert-warning {
    background: #FEF3C7;
    border-color: var(--warning-color);
    color: #92400E;
}

.alert-info {
    background: var(--light-bg);
    border-color: var(--primary-color);
    color: #075985;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    background: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.badge-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.badge-warning {
    background: linear-gradient(135deg, var(--warning-color), #D97706);
}

/* Tables */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1.25rem;
    text-align: left;
    font-weight: 600;
}

td {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: var(--light-bg);
}

/* Footer */
footer {
    background: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
    border-top: 3px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 0.5rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--primary-color);
}

footer p {
    text-align: center;
    color: var(--text-secondary);
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

/* Animations */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .features {
        grid-template-columns: 1fr;
    }

    nav ul {
        width: 100%;
        justify-content: center;
    }

    .columns-2,
    .columns-3,
    .columns-4 {
        grid-template-columns: 1fr;
    }
    
    .box {
        padding: 1.5rem;
    }
    
    .column {
        padding: 1rem;
    }
}