/* Dark mode overrides */
[data-theme="dark"] {
    --tool-bg: #0f172a;
    --tool-border: #334155;
    --tool-border-hover: #475569;
    --tool-text: #f8fafc;
    --tool-text-secondary: #94a3b8;
    --tool-input-bg: #1e293b;
    --tool-input-border: #334155;
    --tool-button-bg: #1e293b;
    --tool-button-hover: #334155;
    --tool-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
    --tool-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --background-color: #0f172a;
    --text-color: #f8fafc;
    --status-info: rgba(96, 165, 250, 0.2);
    --status-success: rgba(34, 197, 94, 0.2);
    --status-error: rgba(248, 113, 113, 0.2);
    --bg-color: #0f172a;
}

/* Dark mode element overrides */
[data-theme="dark"] .tool-card {
    background: var(--bg-card, #1e293b);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] .tool-hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: var(--input-bg, #1e293b);
    color: var(--text-primary, #f8fafc);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: var(--text-muted, #64748b);
}

[data-theme="dark"] .tab-btn.active {
    color: white;
}

[data-theme="dark"] label {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] p {
    color: var(--text-secondary, #cbd5e1);
}

/* Dark mode text color fixes */
[data-theme="dark"] .input-prefix,
[data-theme="dark"] .input-suffix,
[data-theme="dark"] .input-icon {
    color: #94a3b8;
}

.calculator-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.calculator-header {
    text-align: center;
    margin-bottom: 3rem;
}

.calculator-header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.calculator-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.calculator-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.full-width {
    grid-column: 1 / -1;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: #d69e2e;
    box-shadow: 0 0 0 3px rgba(214, 158, 46, 0.1);
}

.input-group {
    position: relative;
}

.input-prefix {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-weight: 500;
}

.input-suffix {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-weight: 500;
}

.form-input.has-prefix {
    padding-left: 2.5rem;
}

.form-input.has-suffix {
    padding-right: 3rem;
}

.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
    background: var(--bg-primary);
    transition: border-color 0.3s ease;
}

.form-select:focus {
    outline: none;
    border-color: #d69e2e;
    box-shadow: 0 0 0 3px rgba(214, 158, 46, 0.1);
}

.fuel-type-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.fuel-btn {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    text-align: center;
}

.fuel-btn:hover,
.fuel-btn.active {
    border-color: #d69e2e;
    background: #d69e2e;
    color: var(--bg-primary);
}

.results-section {
    background: linear-gradient(135deg, #d69e2e 0%, #b7791f 100%);
    color: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.result-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.result-label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.result-value.large {
    font-size: 2.5rem;
}

.trip-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.trip-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.trip-card:hover,
.trip-card.active {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.trip-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.trip-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.trip-cost {
    font-size: 1.2rem;
    font-weight: 700;
}

.comparison-section {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.comparison-card {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.comparison-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    text-align: center;
}

.comparison-metric {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.comparison-metric:last-child {
    border-bottom: none;
    font-weight: 700;
    border-top: 2px solid var(--border-color);
    margin-top: 1rem;
    padding-top: 1rem;
}

.metric-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.metric-value {
    font-weight: 600;
    color: var(--text-secondary);
}

.efficiency-tips {
    background: var(--color-green-soft);
    border: 2px solid #68d391;
    border-radius: 12px;
    padding: 2rem;
    margin-top: 2rem;
}

.tips-title {
    color: var(--text-success);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.tip-card {
    background: var(--bg-primary);
    border-radius: 8px;
    padding: 1.5rem;
    border-left: 4px solid #68d391;
}

.tip-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.tip-title {
    font-weight: 600;
    color: var(--text-success);
    margin-bottom: 0.5rem;
}

.tip-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.annual-projection {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

.projection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.projection-card {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    border: 2px solid var(--border-color);
}

.projection-period {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.projection-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-container {
        padding: 1rem;
    }
    
    .fuel-type-selector {
        grid-template-columns: repeat(2, 1fr);
    }
}