/* ===== GLOBAL STYLES ===== */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --bg-dark: #1a252f;
    --bg-light: #ecf0f1;
    --text-light: #ffffff;
    --text-dark: #2c3e50;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --shadow: 0 10px 30px rgba(0,0,0,0.2);
    --border-radius: 15px;
}

* {
    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: var(--bg-light);
    overflow-x: hidden;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

/* ===== MAIN CONTENT ===== */
.main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

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

/* ===== HERO SECTION ===== */
.hero {
    background: var(--gradient-primary);
    color: var(--text-light);
    text-align: center;
    padding: 4rem 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    animation: rotate 60s linear infinite;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    animation: fadeInUp 1s ease;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-secondary);
    color: var(--text-light);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--text-light);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

/* ===== FEATURE CARDS ===== */
.features {
    padding: 4rem 0;
    background: var(--bg-light);
}

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

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: pulse 2s infinite;
}

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

/* ===== DASHBOARD CARDS ===== */
.dashboard {
    padding: 2rem 0;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.dashboard-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all 0.3s ease;
}

.dashboard-card:hover {
    transform: scale(1.02);
}

.card-header {
    background: var(--gradient-primary);
    color: var(--text-light);
    padding: 1.5rem;
    text-align: center;
}

.card-body {
    padding: 2rem;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

/* ===== RESULTS SECTION ===== */
.results {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
    border-left: 5px solid var(--success-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid #ddd;
}

.result-item:last-child {
    border-bottom: none;
}

.result-value {
    font-weight: bold;
    color: var(--success-color);
}

/* ===== CHARTS ===== */
.chart-container {
    margin: 2rem 0;
    padding: 1rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.chart {
    width: 100%;
    height: 300px;
    background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%),
                linear-gradient(-45deg, #f0f0f0 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #f0f0f0 75%),
                linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: bold;
}

/* ===== PROGRESS BARS ===== */
.progress {
    background: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    height: 20px;
    margin: 0.5rem 0;
}

.progress-bar {
    height: 100%;
    background: var(--gradient-success);
    transition: width 1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
}

/* ===== LOADING ANIMATION ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: rotate 1s ease-in-out infinite;
}

.hidden {
    display: none !important;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 1rem;
    }
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-danger { color: var(--accent-color); }
.mb-2 { margin-bottom: 1rem; }
.mt-2 { margin-top: 1rem; }
.p-2 { padding: 1rem; }

/* ===== FOOTER ===== */
.footer {
    background: var(--primary-color);
    color: var(--text-light);
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}