:root {
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --secondary: #10B981;
    --dark: #F9FAFB;
    --light: transparent;
    --gray-100: rgba(255, 255, 255, 0.05);
    --gray-200: rgba(255, 255, 255, 0.1);
    --gray-500: #9CA3AF;
    --gray-800: #F3F4F6;
    --surface: rgba(31, 41, 55, 0.8);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(to right, rgba(17, 24, 39, 0.95), rgba(17, 24, 39, 0.85)), url('/static/images/hero-bg.png');
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    color: var(--gray-800);
    -webkit-font-smoothing: antialiased;
}

/* Dark Mode Overrides */
.bg-white, .bg-light {
    background-color: transparent !important;
}

.text-dark {
    color: var(--dark) !important;
}

.text-muted {
    color: var(--gray-500) !important;
}

h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--dark);
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color 0.2s;
}

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

/* Navbar */
.navbar {
    background-color: rgba(17, 24, 39, 0.8) !important;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--dark) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--gray-500) !important;
    transition: color 0.2s;
}

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

/* Buttons */
.btn {
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 1px 2px 0 rgba(99, 102, 241, 0.5);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.5);
}

.btn-outline-secondary {
    color: #ffffff !important;
    border-color: rgba(255, 255, 255, 0.6) !important;
    background: rgba(255, 255, 255, 0.1);
}

.btn-outline-secondary:hover {
    background-color: #ffffff !important;
    color: #1F2937 !important;
    border-color: #ffffff !important;
}

.btn-light {
    background-color: #ffffff !important;
    color: #1F2937 !important;
    border: 1px solid rgba(255, 255, 255, 0.5) !important;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.btn-light:hover {
    background-color: #f9fafb !important;
    transform: translateY(-1px);
}

/* Cards */
.card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    background: var(--surface) !important;
    backdrop-filter: blur(12px);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-header {
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    color: #ffffff;
}

.bg-primary.bg-opacity-10 {
    background-color: rgba(99, 102, 241, 0.2) !important;
}

/* Forms */
.form-control {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    background-color: #ffffff;
    color: #1F2937;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    background-color: #ffffff;
    color: #1F2937;
}

.form-control::placeholder {
    color: var(--gray-500);
}

.form-label {
    font-weight: 500;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

/* Tables */
.table {
    margin-bottom: 0;
    color: var(--gray-800);
    --bs-table-bg: transparent;
    --bs-table-color: var(--gray-800);
    background-color: transparent !important;
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    background-color: rgba(255, 255, 255, 0.02);
    border-bottom: none;
    padding: 1rem 1.5rem;
}

.table td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
    color: var(--gray-800);
    border-bottom: 1px solid var(--gray-200);
}

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

.table-hover tbody tr:hover {
    color: var(--dark);
    background-color: rgba(255, 255, 255, 0.02);
}


/* Utilities */
.bg-gradient-primary {
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
}

.text-gradient {
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-image: linear-gradient(to right, #4F46E5, #7C3AED);
}

.hero-section .text-gradient {
    background-image: linear-gradient(to right, #818cf8, #c084fc);
}

.shadow-hover:hover {
    box-shadow: var(--shadow-lg) !important;
}

/* Hero Section */
.hero-section {
    position: relative;
    overflow: hidden;
    padding: 6rem 0;
    color: white;
}

.hero-bg {
    display: none;
}

/* Auth Pages */
.auth-card {
    max-width: 400px;
    width: 100%;
    margin: 0 auto;
}

.auth-bg {
    background-color: transparent;
}

/* Footer */
footer {
    border-top: 1px solid var(--gray-200);
    background-color: var(--surface);
    backdrop-filter: blur(12px);
}

.input-group-text {
    background-color: #ffffff;
    border-color: var(--gray-200);
    color: #6B7280;
}


.logo-placeholder { width:32px; height:32px; background:linear-gradient(135deg,#6c5ce7,#00b894); }
.client-logos img { opacity: .6; filter: grayscale(100%); transition: all 0.3s; }
.client-logos img:hover { opacity: 1; filter: grayscale(0%); }
section { scroll-margin-top: 80px; }

/* Accordion */
.accordion-item {
    background-color: transparent;
    border: 1px solid var(--gray-200);
}

.accordion-button {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--dark);
}

.accordion-button:not(.collapsed) {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary-hover);
    box-shadow: none;
}

.accordion-button::after {
    filter: invert(1);
}

.accordion-body {
    color: var(--gray-500);
}

/* Blockquote */
.blockquote {
    color: var(--dark);
}

/* Mobile Responsiveness */
.main-content {
    padding-top: 80px;
}

@media (max-width: 768px) {
    .main-content {
        padding-top: 70px;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .hero-section {
        padding: 4rem 0;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .lead {
        font-size: 1.1rem;
    }
}

/* QR Generator Tabs */
#qrTabs .nav-link {
    color: var(--gray-500);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

#qrTabs .nav-link:hover {
    color: var(--dark);
    background-color: rgba(99, 102, 241, 0.05);
}

#qrTabs .nav-link.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

#qrTabs .nav-link i {
    font-size: 0.9rem;
}

.tab-content {
    min-height: 300px;
}

/* Responsive tabs for mobile */
@media (max-width: 576px) {
    #qrTabs .nav-link {
        font-size: 0.75rem;
        padding: 0.4rem 0.5rem;
    }
    
    #qrTabs .nav-link i {
        display: none;
    }
}