@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-main: #0b0f19;
    --bg-card: #151c2c;
    --bg-card-hover: #1d263b;
    --color-primary: #10b981; /* Emerald Green */
    --color-primary-hover: #059669;
    --color-primary-light: rgba(16, 185, 129, 0.15);
    --color-text-primary: #f3f4f6;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    --color-border: #1e293b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --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);
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
}

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

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

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

/* Header & Navigation */
header {
    background-color: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--color-text-primary);
    letter-spacing: -0.025em;
}

.logo-accent {
    color: var(--color-primary);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Base Layout & Sections */
main {
    flex-grow: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 1.5rem;
    background: radial-gradient(circle at top, rgba(16, 185, 129, 0.08) 0%, rgba(11, 15, 25, 0) 60%);
    border-bottom: 1px solid var(--color-border);
}

.hero-tagline {
    display: inline-block;
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    padding: 0.35rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
}

.hero h1 span {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem auto;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: #0b0f19;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.85rem 2rem;
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
    transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
    cursor: pointer;
    border: none;
}

.cta-button:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    color: #0b0f19;
}

.cta-button:active {
    transform: translateY(0);
}

/* Calculator & Results Layout */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    margin-top: 2rem;
}

@media (min-width: 992px) {
    .calculator-grid {
        grid-template-columns: 1fr 1.2fr;
    }
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.card:hover {
    border-color: rgba(16, 185, 129, 0.3);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 1rem;
}

.card-title svg {
    color: var(--color-primary);
    width: 24px;
    height: 24px;
}

/* Form Styles */
.form-group {
    margin-bottom: 1.75rem;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 0.6rem;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    pointer-events: none;
    font-weight: 500;
}

.form-control {
    width: 100%;
    background-color: rgba(11, 15, 25, 0.6);
    border: 1.5px solid var(--color-border);
    color: var(--color-text-primary);
    padding: 0.85rem 1rem 0.85rem 2.5rem;
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-control-suffix {
    position: absolute;
    right: 1rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    pointer-events: none;
}

.range-slider-container {
    margin-top: 0.5rem;
}

.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    margin: 1rem 0;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

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

.range-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
    transition: transform var(--transition-fast);
}

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

.range-limits {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Results Formatting */
.results-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 1rem;
    height: 100%;
    color: var(--color-text-secondary);
}

.placeholder-icon {
    width: 64px;
    height: 64px;
    color: var(--color-border);
    margin-bottom: 1.5rem;
}

.results-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.metrics-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 576px) {
    .metrics-row {
        grid-template-columns: 1fr 1fr;
    }
}

.metric-card {
    background-color: rgba(11, 15, 25, 0.4);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--color-border);
}

.metric-card.accent::before {
    background-color: var(--color-primary);
}

.metric-card.info::before {
    background-color: var(--color-info);
}

.metric-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.metric-subvalue {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

/* Savings Display Section */
.savings-banner {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(5, 150, 105, 0.05) 100%);
    border: 1px dashed rgba(16, 185, 129, 0.4);
    border-radius: var(--border-radius-md);
    padding: 1.75rem;
    text-align: center;
}

.savings-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.savings-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.savings-desc {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Visual Breakdown / Progress Bars */
.breakdown-section {
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
}

.breakdown-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.progress-group {
    margin-bottom: 1.25rem;
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.progress-label-text {
    font-weight: 600;
    color: var(--color-text-secondary);
}

.progress-value-text {
    font-weight: 700;
    color: var(--color-text-primary);
}

.progress-bar-container {
    height: 10px;
    background-color: var(--color-border);
    border-radius: 50px;
    overflow: hidden;
    position: relative;
}

.progress-bar {
    height: 100%;
    border-radius: 50px;
    width: 0;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.progress-bar.standard {
    background-color: var(--color-danger);
}

.progress-bar.efficient {
    background-color: var(--color-primary);
}

.progress-bar-legend {
    display: flex;
    gap: 1.5rem;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.legend-dot.red { background-color: var(--color-danger); }
.legend-dot.green { background-color: var(--color-primary); }

/* Tips Grid Section */
.tips-section {
    border-top: 1px solid var(--color-border);
    padding-top: 4rem;
    margin-top: 4rem;
}

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

.section-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.section-header p {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.tips-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .tips-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.tip-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    padding: 1.75rem;
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.tip-card:hover {
    transform: translateY(-5px);
    border-color: rgba(16, 185, 129, 0.25);
}

.tip-icon-box {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.tip-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.tip-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Info Pages & Content Styling (Contact, Privacy, Terms) */
.page-header {
    text-align: center;
    padding: 3rem 1.5rem;
    background: radial-gradient(circle at top, rgba(16, 185, 129, 0.05) 0%, rgba(11, 15, 25, 0) 50%);
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.page-header p {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

@media (min-width: 992px) {
    .content-grid.contact-grid {
        grid-template-columns: 1.2fr 1fr;
    }
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

.contact-item {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
}

.contact-icon-box {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-details h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.contact-details p, .contact-details a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.contact-details a:hover {
    color: var(--color-primary);
}

.contact-map-container {
    margin-top: 2rem;
    height: 250px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.contact-map-placeholder {
    width: 100%;
    height: 100%;
    background-color: var(--bg-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    color: var(--color-text-secondary);
}

.map-icon {
    width: 36px;
    height: 36px;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.form-alert {
    padding: 1rem;
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    display: none;
}

.form-alert.success {
    background-color: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--color-primary);
}

.form-alert.error {
    background-color: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-danger);
}

/* Legal text formatting */
.legal-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-lg);
}

.legal-content h2 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-top: 2.25rem;
    margin-bottom: 1rem;
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.legal-content h2:first-of-type {
    margin-top: 0;
}

.legal-content p, .legal-content ul {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
    line-height: 1.7;
}

.legal-content ul {
    padding-left: 1.5rem;
}

.legal-content li {
    margin-bottom: 0.5rem;
}

/* Footer Section */
footer {
    background-color: #070a11;
    border-top: 1px solid var(--color-border);
    padding: 4rem 1.5rem 2rem 1.5rem;
    color: var(--color-text-secondary);
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }
}

.footer-brand h2 {
    color: var(--color-text-primary);
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.9rem;
    max-width: 320px;
    margin-bottom: 1.5rem;
}

.footer-links h3 {
    color: var(--color-text-primary);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    font-size: 0.9rem;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-bottom-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

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

/* Compliance Disclaimer Box */
.compliance-disclaimer {
    background-color: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--color-text-muted);
    text-align: justify;
    margin-top: 1rem;
}

/* Screen Reader / Utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Mobile Nav Overlay styling */
@media (max-width: 767px) {
    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-card);
        border-bottom: 1px solid var(--color-border);
        padding: 1.5rem;
        box-shadow: var(--shadow-lg);
    }
    
    nav.show {
        display: block;
    }
    
    nav ul {
        flex-direction: column;
        gap: 1.25rem;
        align-items: center;
    }
    
    .menu-toggle {
        display: block;
    }

    .legal-container {
        padding: 1.5rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }
}