/* ===================================
   LIQUID GLASS DESIGN SYSTEM
   CalculadoraCO2 - Brazilian CO2 Calculator
   =================================== */

/* CSS Custom Properties */
:root {
    /* Liquid Glass Background Colors */
    --bg-dark: #0a1929;
    --bg-dark-secondary: #1e293b;
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;

    /* Glass Effect Variables */
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-bg-hover: rgba(255, 255, 255, 0.12);
    --glass-bg-strong: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-border-subtle: rgba(255, 255, 255, 0.2);
    --glass-shadow:
        0 8px 32px 0 rgba(0, 0, 0, 0.37),
        0 2px 8px 0 rgba(0, 0, 0, 0.2);
    --glass-shadow-strong:
        0 12px 48px 0 rgba(0, 0, 0, 0.5),
        0 4px 12px 0 rgba(0, 0, 0, 0.3),
        inset 0 1px 0 0 rgba(255, 255, 255, 0.1);
    --glass-blur: 20px;
    --glass-blur-strong: 25px;

    /* Eco-friendly Accent Colors */
    --primary: #22c55e;
    --secondary: #16a34a;
    --accent: #4ade80;
    --accent-light: #86efac;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    /* Text Colors for Dark Theme */
    --text: #f1f5f9;
    --text-light: #cbd5e1;
    --text-muted: #94a3b8;
    --text-dark: #64748b;

    /* Spacing scale */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border radius */
    --radius: 0.75rem;
    --radius-lg: 1.25rem;
    --radius-xl: 1.5rem;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    min-height: 100vh;
    background:
        radial-gradient(circle at 20% 20%, rgba(34, 197, 94, 0.15), transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.12), transparent 50%),
        linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    font-family: var(--font-sans);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Global container to center content */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Liquid Glass Effect Classes */
.glass {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.1),
            rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-lg);
}

.glass-strong {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.15),
            rgba(255, 255, 255, 0.08));
    backdrop-filter: blur(var(--glass-blur-strong));
    -webkit-backdrop-filter: blur(var(--glass-blur-strong));
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: var(--glass-shadow-strong);
}

.glass-subtle {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.06),
            rgba(255, 255, 255, 0.03));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border-subtle);
    box-shadow: 0 4px 16px 0 rgba(0, 0, 0, 0.25);
}

/* Header Styles */
.header {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    backdrop-filter: blur(var(--glass-blur-strong));
    -webkit-backdrop-filter: blur(var(--glass-blur-strong));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-strong);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.header__title {
    color: var(--text);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.header__subtitle {
    color: var(--text-light);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Main Content */
.main {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Form Styles */
.calculator-form {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    backdrop-filter: blur(var(--glass-blur-strong));
    -webkit-backdrop-filter: blur(var(--glass-blur-strong));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-strong);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group__label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.form-group__input {
    width: 100%;
    padding: var(--spacing-sm);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.08),
            rgba(255, 255, 255, 0.04));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border-subtle);
    border-radius: var(--radius);
    font-size: 1rem;
    color: var(--text);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.form-group__input::placeholder {
    color: var(--text-muted);
}

.form-group__input:focus {
    outline: none;
    border-color: var(--primary);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.3);
}

.form-group__input:read-only {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.04),
            rgba(255, 255, 255, 0.02));
    cursor: not-allowed;
    color: var(--text-muted);
}

.form-group__helper-text {
    display: block;
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.form-group__checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    margin-top: var(--spacing-sm);
}

.form-group__checkbox-input {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
    accent-color: var(--primary);
}

.form-group__checkbox-label {
    font-weight: 500;
    color: var(--text);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Transport Mode Grid */
.transport-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.transport-grid__option {
    position: relative;
    cursor: pointer;
}

.transport-grid__radio {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.transport-grid__label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.08),
            rgba(255, 255, 255, 0.04));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border-subtle);
    border-radius: var(--radius);
    transition: all 0.3s ease;
    min-height: 120px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.transport-grid__label:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    border-color: var(--glass-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.transport-grid__icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.transport-grid__text {
    font-weight: 600;
    color: var(--text);
    text-align: center;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.transport-grid__radio:checked+.transport-grid__label {
    border-color: var(--primary);
    border-width: 2px;
    background: linear-gradient(135deg,
            rgba(34, 197, 94, 0.2),
            rgba(34, 197, 94, 0.1));
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.2),
        0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Submit Button */
.form-submit {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: var(--spacing-sm);
    box-shadow:
        0 4px 16px rgba(34, 197, 94, 0.3),
        0 2px 8px rgba(0, 0, 0, 0.2);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.form-submit:hover {
    transform: translateY(-2px);
    box-shadow:
        0 8px 24px rgba(34, 197, 94, 0.4),
        0 4px 12px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, var(--accent), var(--primary));
}

.form-submit:disabled {
    background: linear-gradient(135deg,
            rgba(100, 116, 139, 0.5),
            rgba(71, 85, 105, 0.5));
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Results Sections */
.results,
.comparison,
.carbon-credits {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    backdrop-filter: blur(var(--glass-blur-strong));
    -webkit-backdrop-filter: blur(var(--glass-blur-strong));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow-strong);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeInBlur 0.6s ease-out;
}

.results__content,
.comparison__content,
.carbon-credits__content {
    color: var(--text);
}

/* Results Grid */
.results__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.results__card {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.1),
            rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    border: 1px solid var(--glass-border-subtle);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.3s ease;
}

.results__card:hover {
    transform: translateY(-4px);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.14),
            rgba(255, 255, 255, 0.07));
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    border-color: var(--glass-border);
}

.results__card--highlight {
    border: 2px solid var(--primary);
    background: linear-gradient(135deg,
            rgba(34, 197, 94, 0.15),
            rgba(34, 197, 94, 0.08));
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.15),
        0 4px 16px rgba(0, 0, 0, 0.25);
}

.results__card--success {
    border: 2px solid var(--accent);
    background: linear-gradient(135deg,
            rgba(74, 222, 128, 0.15),
            rgba(74, 222, 128, 0.08));
    box-shadow:
        0 0 0 3px rgba(74, 222, 128, 0.15),
        0 4px 16px rgba(0, 0, 0, 0.25);
}

.results__card-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.results__card-content {
    flex: 1;
}

.results__card-title {
    font-size: 0.875rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    font-weight: 600;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.results__card-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.results__card-value--large {
    font-size: 2rem;
    color: var(--accent-light);
}

.results__card-subtitle {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 0.25rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Comparison Section */
.comparison__grid {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.comparison__item {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.08),
            rgba(255, 255, 255, 0.04));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 1.5rem;
    border: 1px solid var(--glass-border-subtle);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.comparison__item:hover {
    border-color: var(--glass-border);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.12),
            rgba(255, 255, 255, 0.06));
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    transform: translateY(-2px);
}

.comparison__item--selected {
    border-color: var(--primary);
    border-width: 2px;
    background: linear-gradient(135deg,
            rgba(34, 197, 94, 0.15),
            rgba(34, 197, 94, 0.08));
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.15),
        0 8px 24px rgba(0, 0, 0, 0.35);
}

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

.comparison__icon {
    font-size: 1.5rem;
    margin-right: 0.5rem;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.comparison__label {
    font-weight: 700;
    color: var(--text);
    font-size: 1.125rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.comparison__badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 8px rgba(34, 197, 94, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.3);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.comparison__stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.comparison__stat {
    display: flex;
    flex-direction: column;
}

.comparison__stat-label {
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.comparison__stat-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.comparison__bar-container {
    width: 100%;
    height: 12px;
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.06),
            rgba(255, 255, 255, 0.03));
    backdrop-filter: blur(10px);
    border-radius: 9999px;
    overflow: hidden;
    margin-top: var(--spacing-sm);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison__bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 9999px;
    transition: width 0.5s ease;
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
}

.comparison__tip {
    background: linear-gradient(135deg,
            rgba(59, 130, 246, 0.15),
            rgba(59, 130, 246, 0.08));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-left: 4px solid var(--info);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-top: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-left-width: 4px;
}

.comparison__tip-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.comparison__tip-text {
    flex: 1;
    line-height: 1.6;
    color: var(--text);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.comparison__tip-text strong {
    color: var(--info);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Carbon Credits Section */
.carbon-credits__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.carbon-credits__card {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.1),
            rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
    border: 1px solid var(--glass-border-subtle);
    transition: all 0.3s ease;
}

.carbon-credits__card:hover {
    transform: translateY(-4px);
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.14),
            rgba(255, 255, 255, 0.07));
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    border-color: var(--glass-border);
}

.carbon-credits__card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.carbon-credits__icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.3));
}

.carbon-credits__card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.carbon-credits__card-body {
    text-align: center;
}

.carbon-credits__value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-light);
    line-height: 1;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 12px rgba(74, 222, 128, 0.5);
}

.carbon-credits__helper {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.carbon-credits__info {
    background: linear-gradient(135deg,
            rgba(59, 130, 246, 0.12),
            rgba(59, 130, 246, 0.06));
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 2px dashed rgba(59, 130, 246, 0.5);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.carbon-credits__info-title {
    font-weight: 700;
    color: var(--info);
    margin-bottom: var(--spacing-xs);
    font-size: 1rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.carbon-credits__info-text {
    line-height: 1.6;
    color: var(--text);
    font-size: 0.9375rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.carbon-credits__action {
    text-align: center;
}

.carbon-credits__button {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    font-size: 1rem;
    font-weight: 700;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow:
        0 4px 16px rgba(34, 197, 94, 0.3),
        0 2px 8px rgba(0, 0, 0, 0.2);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.carbon-credits__button:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, var(--accent), var(--primary));
    box-shadow:
        0 8px 24px rgba(34, 197, 94, 0.4),
        0 4px 12px rgba(0, 0, 0, 0.3);
}

.carbon-credits__button:active {
    transform: translateY(0);
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    box-shadow: 0 0 12px rgba(34, 197, 94, 0.5);
}

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

/* Fade In with Blur Animation */
@keyframes fadeInBlur {
    from {
        opacity: 0;
        transform: translateY(20px);
        filter: blur(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
        filter: blur(0);
    }
}

/* Footer */
.footer {
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.1),
            rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer__credits {
    color: var(--text-light);
    font-size: 0.875rem;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* Responsive Design */
@media (max-width: 767px) {
    .header__title {
        font-size: 1.5rem;
    }

    .header__subtitle {
        font-size: 0.875rem;
    }

    .calculator-form {
        padding: var(--spacing-md);
    }

    .transport-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .transport-grid__icon {
        font-size: 2.5rem;
    }

    .results__grid {
        grid-template-columns: 1fr;
    }

    .results__card-value--large {
        font-size: 1.5rem;
    }

    .comparison__stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .carbon-credits__grid {
        grid-template-columns: 1fr;
    }

    .carbon-credits__value {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.5rem;
    }
}

@media (min-width: 768px) {
    .header__title {
        font-size: 2.5rem;
    }

    .transport-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .calculator-form {
        padding: var(--spacing-xl);
    }

    .results__grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* Performance Optimizations */
.glass,
.glass-strong,
.glass-subtle,
.calculator-form,
.results,
.comparison,
.carbon-credits,
.header,
.footer {
    will-change: transform;
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}