:root {
    --primary-navy: #1a2b4a;
    --primary-gold: #d4a574;
    --accent-gold: #c89550;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --border-color: #dee2e6;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
}

* {
    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-dark);
    background-color: var(--light-bg);
}

/* Header & Navigation */
header {
    background: linear-gradient(135deg, var(--primary-navy) 0%, #2c4a7c 100%);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-container img {
    height: 50px;
    width: auto;
    background: white;
    padding: 0.5rem;
    border-radius: 5px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-gold);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--accent-gold) 100%);
    color: var(--primary-navy);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(212, 165, 116, 0.4);
}

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

.btn-secondary:hover {
    background: var(--primary-gold);
    color: var(--primary-navy);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-navy) 0%, #2c4a7c 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    color: rgba(255,255,255,0.9);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Features Section */
.features {
    padding: 5rem 2rem;
    background: var(--white);
}

.features-container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-navy);
    margin-bottom: 3rem;
}

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

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

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

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

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-navy) 0%, #2c4a7c 100%);
}

.auth-box {
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    max-width: 450px;
    width: 100%;
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo img {
    height: 80px;
    width: auto;
    background: white;
    padding: 0.5rem;
    border-radius: 5px;
}

.auth-box h2 {
    color: var(--primary-navy);
    margin-bottom: 2rem;
    text-align: center;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-gold);
}

.form-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-actions .btn {
    width: 100%;
}

.form-link {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-light);
}

.form-link a {
    color: var(--primary-gold);
    text-decoration: none;
    font-weight: 600;
}

.form-link a:hover {
    text-decoration: underline;
}

/* Dashboard */
.dashboard {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--primary-navy);
    color: var(--white);
    padding: 2rem 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-logo {
    text-align: center;
    padding: 0 1rem 2rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo img {
    height: 60px;
    width: auto;
    background: white;
    padding: 0.5rem;
    border-radius: 5px;
}

.sidebar-menu {
    list-style: none;
    padding: 2rem 0;
}

.sidebar-menu li {
    margin-bottom: 0.5rem;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    color: var(--white);
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: rgba(212, 165, 116, 0.2);
    border-left: 4px solid var(--primary-gold);
}

.sidebar-menu .icon {
    font-size: 1.3rem;
}

.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 2rem;
}

.dashboard-header {
    background: var(--white);
    padding: 1.5rem 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dashboard-header h1 {
    color: var(--primary-navy);
}

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

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-navy);
    font-weight: bold;
}

/* Dashboard Cards */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.dashboard-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.dashboard-card h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-icon {
    font-size: 1.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-gold);
    margin: 1rem 0;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* AI Tool Interface */
.tool-container {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.tool-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

.tool-header h2 {
    color: var(--primary-navy);
    margin-bottom: 0.5rem;
}

.tool-description {
    color: var(--text-light);
}

.tool-input-section {
    margin-bottom: 2rem;
}

.tool-input-section h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

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

.tool-output-section {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.chart-container {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

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

.data-table th {
    background: var(--primary-navy);
    color: var(--white);
    font-weight: 600;
}

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

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.alert-success {
    background: rgba(40, 167, 69, 0.1);
    border-left: 4px solid var(--success);
    color: var(--success);
}

.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    border-left: 4px solid var(--warning);
    color: #856404;
}

.alert-info {
    background: rgba(23, 162, 184, 0.1);
    border-left: 4px solid var(--info);
    color: var(--info);
}

/* Loading States */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(212, 165, 116, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-gold);
    animation: spin 1s ease-in-out infinite;
}

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

/* Footer */
footer {
    background: var(--primary-navy);
    color: var(--white);
    padding: 3rem 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .dashboard {
        flex-direction: column;
    }
    
    .dashboard-header {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.hidden { display: none; }