:root {
    /* Color System - Data Dashboard Theme */
    --color-bg-primary: #0a0e1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1a2332;
    --color-bg-elevated: #1f2937;
    
    --color-text-primary: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-text-tertiary: #9ca3af;
    
    --color-accent-primary: #06b6d4;
    --color-accent-secondary: #0ea5e9;
    --color-accent-tertiary: #22d3ee;
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --color-border: #374151;
    --color-border-light: #4b5563;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 100%);
    --gradient-mesh: 
        radial-gradient(at 20% 30%, rgba(6, 182, 212, 0.15) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(14, 165, 233, 0.1) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(34, 211, 238, 0.05) 0px, transparent 50%);
    
    /* Typography */
    --font-display: 'Archivo', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --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, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    --color-bg-elevated: #ffffff;
    
    --color-text-primary: #111827;
    --color-text-secondary: #374151;
    --color-text-tertiary: #6b7280;
    
    --color-border: #e5e7eb;
    --color-border-light: #d1d5db;
    
    --gradient-mesh: 
        radial-gradient(at 20% 30%, rgba(6, 182, 212, 0.08) 0px, transparent 50%),
        radial-gradient(at 80% 70%, rgba(14, 165, 233, 0.05) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(34, 211, 238, 0.03) 0px, transparent 50%);
    
    --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);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-display);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition-slow), color var(--transition-slow);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent-primary);
}

.sun-icon,
.moon-icon {
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: block;
}

/* Header */
.header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) 0;
}

.logo-section {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--gradient-primary);
    transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent-primary);
}

.nav-link.active::after {
    transform: translateX(-50%) scaleX(1);
}

/* Hero Section */
.hero {
    background: var(--gradient-mesh), var(--color-bg-primary);
    padding: var(--spacing-3xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    border-radius: var(--radius-lg);
    color: var(--color-accent-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-lg);
    animation: slideInUp 0.6s ease-out;
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
    animation: slideInUp 0.6s ease-out 0.1s both;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    animation: slideInUp 0.6s ease-out 0.2s both;
}

.stats-row {
    display: flex;
    gap: var(--spacing-xl);
    animation: slideInUp 0.6s ease-out 0.3s both;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.cost-preview-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    animation: slideInRight 0.6s ease-out 0.2s both;
    position: relative;
    overflow: hidden;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.cost-preview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.cost-preview-header {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.cost-preview-amount {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
}

.cost-preview-subtext {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* Calculator Section */
.calculator-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-primary);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.calculator-panel,
.results-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.panel-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

/* Form Elements */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.value-display {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    font-weight: 700;
}

.tooltip-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    cursor: help;
    position: relative;
    margin-left: var(--spacing-xs);
}

.tooltip-content {
    display: none;
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    width: 220px;
    padding: var(--spacing-sm);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    box-shadow: var(--shadow-lg);
    z-index: 10;
    font-weight: 400;
}

.tooltip-trigger:hover .tooltip-content {
    display: block;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.btn-option {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-option:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-text-primary);
}

.btn-option.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.form-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-select:hover,
.form-select:focus {
    border-color: var(--color-accent-primary);
    outline: none;
}

.form-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    outline: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.form-range::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
    margin-top: 0.25rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.form-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-accent-primary);
}

/* Results Panel */
.results-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.results-card:hover {
    box-shadow: var(--shadow-lg);
}

.primary-card {
    background: var(--gradient-mesh), var(--color-bg-elevated);
    border: 1px solid rgba(6, 182, 212, 0.3);
}

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

.results-header h3 {
    font-size: 1.125rem;
    font-weight: 700;
}

.cost-breakdown-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.cost-breakdown-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.cost-breakdown-toggle svg {
    transition: transform var(--transition-base);
}

.cost-breakdown-toggle.active svg {
    transform: rotate(180deg);
}

.total-cost {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-base);
}

.cost-subtext {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
}

.cost-breakdown {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.cost-breakdown.active {
    max-height: 400px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.breakdown-label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.breakdown-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.breakdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-sm) 0;
}

.breakdown-item.highlight {
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
}

.breakdown-item.highlight .breakdown-label {
    font-weight: 700;
    color: var(--color-text-primary);
}

.breakdown-item.highlight .breakdown-value {
    font-size: 1.25rem;
    color: var(--color-accent-primary);
}

.card-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.chart-container {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hourly-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.hourly-stat {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.hourly-label {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.hourly-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent-primary);
}

/* Comparison Section */
.comparison-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-secondary);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-2xl);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.comparison-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.comparison-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent-primary);
}

.comparison-card.recommended {
    border-color: var(--color-accent-primary);
    border-width: 2px;
    position: relative;
}

.comparison-card.recommended::before {
    content: 'RECOMMENDED';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.25rem 0.75rem;
    background: var(--gradient-primary);
    color: white;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    border-radius: var(--radius-md);
}

.comparison-type {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.comparison-cost {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.comparison-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.comparison-detail {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.comparison-detail-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Tips Section */
.tips-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-bg-primary);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.tip-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

.tip-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.tip-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.tip-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.tip-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.tip-savings {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-lg);
    color: var(--color-success);
    font-size: 0.8125rem;
    font-weight: 600;
    font-family: var(--font-mono);
}

/* Footer */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

.coming-soon {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.badge-small {
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.footer-email {
    color: var(--color-accent-primary);
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.footer-note {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-grid,
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .nav {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.875rem;
    }
    
    .stats-row {
        flex-wrap: wrap;
    }
    
    .comparison-grid,
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .total-cost {
        font-size: 2.5rem;
    }
    
    .button-group {
        grid-template-columns: 1fr;
    }
}