/* ===========================================
   FWA Detection Demo - Professional Design System
   =========================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
    /* Primary Colors */
    --color-primary: #1e3a5f;
    --color-primary-dark: #152a45;
    --color-primary-light: #2d4f7a;
    
    /* Accent Colors */
    --color-accent: #0d9488;
    --color-accent-dark: #0a7a70;
    --color-accent-light: #14b8a6;
    
    /* Semantic Colors */
    --color-success: #059669;
    --color-success-light: #10b981;
    --color-warning: #d97706;
    --color-warning-light: #f59e0b;
    --color-danger: #dc2626;
    --color-danger-light: #ef4444;
    
    /* Neutral Colors */
    --color-bg-dark: #0f172a;
    --color-bg-medium: #1e293b;
    --color-bg-light: #334155;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.12);
    
    /* Text Colors */
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    /* Typography */
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 40px rgba(13, 148, 136, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Z-Index Scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(13, 148, 136, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(30, 58, 95, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(13, 148, 136, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text-primary);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.015em; }
h3 { font-size: 1.5rem; letter-spacing: -0.01em; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ==========================================
   Navigation
   ========================================== */
.main-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-8);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
}

.brand-icon {
    flex-shrink: 0;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.brand-accent, .accent {
    color: var(--color-accent);
}

.brand-tagline {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: var(--color-surface-hover);
}

.nav-link.active {
    color: var(--color-accent-light);
    background: rgba(13, 148, 136, 0.1);
}

.nav-link svg {
    opacity: 0.7;
}

.nav-link:hover svg,
.nav-link.active svg {
    opacity: 1;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.nav-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.open span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-sticky);
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-base);
}

.mobile-nav.open {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-link {
    display: block;
    padding: var(--space-4);
    color: var(--color-text-secondary);
    font-weight: 500;
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.8rem;
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(13, 148, 136, 0.4);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    background: var(--color-surface);
    color: var(--color-text-primary);
}

.btn-danger {
    background: linear-gradient(135deg, var(--color-danger) 0%, #b91c1c 100%);
    color: white;
}

/* ==========================================
   Cards
   ========================================== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--color-border-light);
}

.card-glass {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.card-highlight {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-glow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.card-body {
    /* Default body styles */
}

/* ==========================================
   Metric Cards
   ========================================== */
.metric-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
}

.metric-card.success::before {
    background: linear-gradient(90deg, var(--color-success), var(--color-success-light));
}

.metric-card.warning::before {
    background: linear-gradient(90deg, var(--color-warning), var(--color-warning-light));
}

.metric-card.danger::before {
    background: linear-gradient(90deg, var(--color-danger), var(--color-danger-light));
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-text-primary);
    line-height: 1.2;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

.metric-change {
    font-size: 0.8rem;
    font-weight: 500;
    margin-top: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
}

.metric-change.positive {
    color: var(--color-success-light);
}

.metric-change.negative {
    color: var(--color-danger-light);
}

/* ==========================================
   Badges & Pills
   ========================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-success {
    background: rgba(5, 150, 105, 0.15);
    color: var(--color-success-light);
}

.badge-warning {
    background: rgba(217, 119, 6, 0.15);
    color: var(--color-warning-light);
}

.badge-danger {
    background: rgba(220, 38, 38, 0.15);
    color: var(--color-danger-light);
}

.badge-info {
    background: rgba(13, 148, 136, 0.15);
    color: var(--color-accent-light);
}

.badge-neutral {
    background: var(--color-surface);
    color: var(--color-text-secondary);
}

/* Score badges */
.score-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
}

.score-high {
    background: rgba(220, 38, 38, 0.15);
    color: #fca5a5;
    border: 1px solid rgba(220, 38, 38, 0.3);
}

.score-medium {
    background: rgba(245, 158, 11, 0.15);
    color: #fcd34d;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.score-low {
    background: rgba(5, 150, 105, 0.15);
    color: #86efac;
    border: 1px solid rgba(5, 150, 105, 0.3);
}

/* ==========================================
   Tables
   ========================================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    padding: var(--space-4);
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--color-border);
}

.data-table td {
    padding: var(--space-4);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--color-surface-hover);
}

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

/* ==========================================
   Forms
   ========================================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-text-primary);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    font-family: var(--font-mono);
}

.form-hint {
    margin-top: var(--space-2);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ==========================================
   Main Content
   ========================================== */
.main-content {
    flex: 1;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-narrow {
    max-width: 900px;
}

.section {
    padding: var(--space-16) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--space-4);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   Footer
   ========================================== */
.main-footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid var(--color-border);
    padding: var(--space-8) 0;
    margin-top: auto;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-6);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.brand-icon-small svg {
    width: 24px;
    height: 24px;
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-info {
    text-align: right;
}

.footer-info p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.footer-copyright {
    font-size: 0.8rem !important;
    margin-top: var(--space-1);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

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

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.animate-slide-up {
    animation: slideUp 0.6s ease forwards;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }

/* ==========================================
   Utilities
   ========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent-light); }
.text-success { color: var(--color-success-light); }
.text-warning { color: var(--color-warning-light); }
.text-danger { color: var(--color-danger-light); }

.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.hidden { display: none; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Loading spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-12);
    gap: var(--space-4);
    color: var(--color-text-muted);
}

/* Progress bar */
.progress-bar {
    height: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .mobile-nav {
        display: block;
    }
    
    .nav-actions {
        display: none;
    }
    
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
}

@media (max-width: 640px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .section {
        padding: var(--space-10) 0;
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: var(--space-4);
    }
    
    .metric-value {
        font-size: 2rem;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}