/* ===================================
   THE LBMA CO2 Calculator - Official Brand Styles
   Colors: Dark Blue #074A70, Petroleum #02949A, 
   Ice Blue #80DED9, Green #30D28B, Lime #B6ED2F
   Typography: Avenir (Light 300, Medium 500, Black 900)
   =================================== */

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

:root {
    --dark-blue: #074A70;
    --petroleum: #02949A;
    --ice-blue: #80DED9;
    --green: #30D28B;
    --lime: #B6ED2F;
    --white: #FFFFFF;
    --light-gray: #F5F7FA;
    --text-dark: #2C3E50;
    --text-light: #5A6C7D;
}

body {
    font-family: 'Avenir', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-gray);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Classes */
.avenir-light {
    font-weight: 300;
}

.avenir-medium {
    font-weight: 500;
}

.avenir-black {
    font-weight: 900;
}

.script-font {
    font-family: 'Pacifico', cursive;
    color: var(--lime);
    font-size: 1rem;
    margin: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Official LBMA Gradient Bar */
.gradient-bar {
    height: 6px;
    background: linear-gradient(
        to right,
        var(--dark-blue) 0%,
        var(--petroleum) 25%,
        var(--ice-blue) 50%,
        var(--green) 75%,
        var(--lime) 100%
    );
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--petroleum) 100%);
    color: var(--white);
    padding: 2rem 0 0;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-bottom: 2rem;
}

.logo-section {
    margin-bottom: 1rem;
}

.logo {
    font-size: 2.5rem;
    margin-bottom: 0.25rem;
    letter-spacing: 2px;
}

.title {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.badge {
    background: var(--green);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-block;
}

/* Info Banner */
.info-banner {
    background: linear-gradient(135deg, var(--petroleum), var(--ice-blue));
    color: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    margin: 2rem 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.info-banner p {
    font-size: 1rem;
    margin: 0;
}

.info-banner strong {
    font-weight: 500;
}

.disclaimer-text {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(255, 152, 0, 0.15);
    border-radius: 8px;
    border-left: 4px solid #FF9800;
    font-size: 0.9rem;
}

.disclaimer-text strong {
    color: #D84315;
    font-weight: 600;
}

.disclaimer-text a {
    color: var(--petroleum);
    text-decoration: underline;
    font-weight: 500;
}

/* Calculator Tabs */
.calculator-tabs {
    display: flex;
    gap: 0.5rem;
    margin: 2rem 0 1rem;
    flex-wrap: wrap;
    border-bottom: 2px solid var(--petroleum);
}

.tab-button {
    background: transparent;
    border: none;
    color: var(--text-light);
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
}

.tab-button:hover {
    color: var(--petroleum);
    background: rgba(2, 148, 154, 0.05);
}

.tab-button.active {
    color: var(--petroleum);
    border-bottom-color: var(--petroleum);
    background: rgba(2, 148, 154, 0.1);
}

/* Calculator Panels */
.calculator-panel {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.calculator-panel.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calculator-card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    margin-bottom: 2rem;
}

.calculator-card h3 {
    color: var(--dark-blue);
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.calculator-card .description {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Input Groups */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    color: var(--dark-blue);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.value-display {
    display: inline-block;
    background: var(--ice-blue);
    color: var(--dark-blue);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    margin-top: 0.5rem;
    font-size: 1.125rem;
    min-width: 120px;
    text-align: center;
}

/* Sliders */
.slider,
.slider-small {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(to right, var(--ice-blue), var(--green));
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.slider::-webkit-slider-thumb,
.slider-small::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--petroleum);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    transition: all 0.2s ease;
}

.slider::-webkit-slider-thumb:hover,
.slider-small::-webkit-slider-thumb:hover {
    background: var(--green);
    transform: scale(1.1);
}

.slider::-moz-range-thumb,
.slider-small::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--petroleum);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    transition: all 0.2s ease;
}

.slider::-moz-range-thumb:hover,
.slider-small::-moz-range-thumb:hover {
    background: var(--green);
    transform: scale(1.1);
}

/* Select Inputs */
.select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--ice-blue);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--white);
    color: var(--text-dark);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.select:focus {
    outline: none;
    border-color: var(--petroleum);
}

/* Device Inputs */
.device-inputs {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.device-input label {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Calculate Button */
.calculate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--green), var(--petroleum));
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1.125rem;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 12px rgba(48, 210, 139, 0.3);
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(48, 210, 139, 0.4);
}

.calculate-btn:active {
    transform: translateY(0);
}

/* Results Section */
.results-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--ice-blue);
}

.result-main {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, var(--petroleum), var(--ice-blue));
    border-radius: 12px;
    margin-bottom: 2rem;
}

.result-main h4 {
    color: var(--white);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.co2-value {
    color: var(--white);
    font-size: 3rem;
    margin: 0.5rem 0;
}

.result-main p {
    color: var(--white);
    opacity: 0.95;
}

/* Comparison Cards */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.comparison-card {
    background: var(--white);
    border: 2px solid var(--ice-blue);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.comparison-card:hover {
    border-color: var(--green);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.comparison-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.comparison-value {
    color: var(--petroleum);
    font-size: 1.75rem;
    font-weight: 500;
    margin: 0.5rem 0;
}

.comparison-label {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Breakdown Section */
.breakdown-section {
    margin: 2rem 0;
}

.breakdown-section h4 {
    color: var(--dark-blue);
    margin-bottom: 1rem;
}

.breakdown-item {
    margin-bottom: 1rem;
}

.breakdown-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.breakdown-label {
    color: var(--text-dark);
    font-weight: 500;
}

.breakdown-value {
    color: var(--petroleum);
    font-weight: 500;
}

.breakdown-bar {
    height: 12px;
    background: var(--light-gray);
    border-radius: 6px;
    overflow: hidden;
}

.breakdown-fill {
    height: 100%;
    background: linear-gradient(to right, var(--green), var(--petroleum));
    border-radius: 6px;
    transition: width 0.6s ease;
}

/* Recommendations */
.recommendations-section {
    background: linear-gradient(135deg, var(--green), var(--lime));
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 2rem;
}

.recommendations-section h4 {
    color: var(--white);
    margin-bottom: 1rem;
}

.recommendations-section ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.recommendations-section li {
    color: var(--white);
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.recommendations-section li:before {
    content: "✓";
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Methodology Section */
.methodology-section {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.methodology-section h3 {
    color: var(--dark-blue);
    font-size: 1.75rem;
    margin-bottom: 1rem;
    text-align: center;
}

.methodology-intro {
    text-align: center;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 2rem;
    font-size: 1rem;
    line-height: 1.7;
}

.methodology-intro strong {
    color: var(--petroleum);
    font-weight: 600;
}

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

.methodology-card {
    background: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--petroleum);
}

.methodology-card h4 {
    color: var(--petroleum);
    margin-bottom: 0.5rem;
}

.methodology-card p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: var(--dark-blue);
    color: var(--white);
    padding-top: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 3rem 0 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--lime);
}

.footer-section p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.9;
    transition: all 0.3s ease;
}

.footer-links a:hover {
    color: var(--lime);
    opacity: 1;
}

.footer-cta {
    display: inline-block;
    background: var(--green);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    margin-top: 1rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.footer-cta:hover {
    background: var(--lime);
    color: var(--dark-blue);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 2rem;
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        padding-bottom: 1.5rem;
    }

    .logo {
        font-size: 2rem;
    }

    .title {
        font-size: 1.5rem;
    }

    .calculator-tabs {
        flex-direction: column;
    }

    .tab-button {
        width: 100%;
        text-align: left;
    }

    .calculator-card {
        padding: 1.5rem;
    }

    .co2-value {
        font-size: 2rem;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .calculator-card {
        padding: 1rem;
    }

    .logo {
        font-size: 1.75rem;
    }

    .title {
        font-size: 1.25rem;
    }
}