/* AI-powered Device Monitoring & SMS Control System - Custom Styles */

:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --primary-red: #dc2626;
    --secondary-red: #ef4444;
    --gradient-primary: linear-gradient(135deg, #1e3a8a 0%, #dc2626 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #ef4444 100%);
    --light-gray: #f8fafc;
    --dark-gray: #1f2937;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

/* Gradient Background */
.gradient-bg {
    background: var(--gradient-primary);
    color: var(--white);
}

.gradient-bg-secondary {
    background: var(--gradient-secondary);
    color: var(--white);
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-gray) !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-blue) !important;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-section::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>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Buttons */
.btn-gradient {
    background: var(--gradient-secondary);
    border: none;
    color: var(--white);
    font-weight: 600;
    padding: 12px 30px;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

.btn-outline-gradient {
    border: 2px solid transparent;
    background: linear-gradient(var(--white), var(--white)) padding-box,
                var(--gradient-secondary) border-box;
    color: var(--primary-blue);
    font-weight: 600;
    padding: 10px 30px;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.btn-outline-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-blue);
}

/* Cards */
.card {
    border: none;
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    font-weight: 600;
    padding: 1.25rem;
}

/* Pricing Cards */
.pricing-card {
    position: relative;
    background: var(--white);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.pricing-card.featured {
    border-color: var(--primary-blue);
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.price-period {
    color: var(--dark-gray);
    font-size: 1rem;
}

/* Features */
.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-secondary);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--white);
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 3rem 0 1rem;
}

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

.footer a:hover {
    color: var(--secondary-blue);
}

/* Dashboard Styles */
.sidebar {
    background: var(--gradient-primary);
    min-height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    z-index: 1000;
    transition: all 0.3s ease;
}

.sidebar-nav .nav-link {
    color: var(--white) !important;
    padding: 12px 20px;
    margin: 5px 15px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white) !important;
}

.main-content {
    margin-left: 250px;
    min-height: 100vh;
    background: var(--light-gray);
}

/* Stats Cards */
.stat-card {
    background: var(--white);
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-blue);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
}

/* Tables */
.table {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table thead th {
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    font-weight: 600;
    padding: 1rem;
}

.table tbody tr {
    transition: background-color 0.3s ease;
}

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

/* Forms */
.form-control {
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    padding: 12px 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 0.2rem rgba(30, 58, 138, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .pricing-card {
        margin-bottom: 2rem;
    }
}

/* 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: spin 1s ease-in-out infinite;
}

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

/* Success/Error Messages */
.alert {
    border: none;
    border-radius: 10px;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
}

.alert-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: var(--white);
}

.alert-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: var(--white);
}

.alert-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: var(--white);
}

.alert-info {
    background: linear-gradient(135deg, #3b82f6 0%, #1e3a8a 100%);
    color: var(--white);
}