/* Burn Rate Calculator - Styles */
/* Design System Variables */
:root {
    --primary: #C62E2E;
    --primary-dark: #A02424;
    --secondary: #1e1e1e;
    --accent: #C1E172;
    --bg-light: #f8f9fa;
    --text-dark: #1e1e1e;
    --text-muted: #6c757d;
    --white: #ffffff;
    --border: #e0e0e0;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary);
    transition: var(--transition);
}

.logo a:hover {
    opacity: 0.8;
}

.logo i {
    font-size: 1.75rem;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-description {
    font-size: 1.25rem;
    opacity: 0.95;
    max-width: 700px;
    margin: 0 auto;
}

/* Tool Section */
.tool-section {
    padding: 4rem 0;
}

.calculator-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 3rem;
    max-width: 900px;
    margin: 0 auto;
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group label i {
    color: var(--primary);
}

.form-group input {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(198, 46, 46, 0.1);
}

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

.help-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: italic;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn {
    padding: 0.875rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    flex: 1;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-light);
    color: var(--text-dark);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--white);
    border-color: var(--text-muted);
}

/* Results Section */
.results-section {
    margin-top: 3rem;
    padding-top: 3rem;
    border-top: 2px solid var(--bg-light);
}

.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-header h2 {
    font-size: 2rem;
    color: var(--text-dark);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.result-card {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-left: 4px solid;
    transition: var(--transition);
}

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

.result-card.danger {
    border-color: #dc3545;
}

.result-card.warning {
    border-color: #ffc107;
}

.result-card.info {
    border-color: #17a2b8;
}

.result-card.success {
    border-color: #28a745;
}

.result-icon {
    font-size: 2rem;
}

.result-card.danger .result-icon {
    color: #dc3545;
}

.result-card.warning .result-icon {
    color: #ffc107;
}

.result-card.info .result-icon {
    color: #17a2b8;
}

.result-card.success .result-icon {
    color: #28a745;
}

.result-content {
    display: flex;
    flex-direction: column;
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

/* Chart */
.chart-container {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 2rem;
    margin-bottom: 2rem;
}

.chart-container h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

#runwayChart {
    max-height: 400px;
}

/* Recommendation */
.recommendation-card {
    background: linear-gradient(135deg, var(--accent) 0%, #a8c85a 100%);
    border-radius: var(--radius-md);
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.recommendation-icon {
    font-size: 2.5rem;
    color: var(--secondary);
    flex-shrink: 0;
}

.recommendation-content h4 {
    font-size: 1.5rem;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.recommendation-content p {
    font-size: 1.05rem;
    color: var(--text-dark);
    line-height: 1.7;
}

/* Features Section */
.features-section {
    padding: 5rem 0;
    background: var(--white);
}

.features-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

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

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* How To Section */
.how-to-section {
    padding: 5rem 0;
    background: var(--bg-light);
}

.how-to-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.steps-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.step-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.step-content p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--secondary) 0%, #000000 100%);
    color: var(--white);
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-text h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-text p {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.cta-subtext {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.btn-cta-primary {
    background: var(--primary);
    color: var(--white);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-cta-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-cta-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-cta-secondary:hover {
    background: var(--white);
    color: var(--secondary);
}

/* FAQ Section */
.faq-section {
    padding: 5rem 0;
    background: var(--white);
}

.faq-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-light);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.5rem;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    font-family: inherit;
}

.faq-question:hover {
    background: rgba(198, 46, 46, 0.05);
}

.faq-question i {
    transition: var(--transition);
    color: var(--primary);
}

.faq-question[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* Content Section */
.content-section {
    padding: 5rem 0;
    background: var(--bg-light);
}

.content-article {
    max-width: 900px;
    margin: 0 auto;
    background: var(--white);
    padding: 3rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.content-article h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.content-article h3 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.content-article p {
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* Footer */
.footer {
    background: var(--secondary);
    color: var(--white);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

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

.footer-brand p {
    opacity: 0.8;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

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

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

.footer-column a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: var(--transition);
}

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

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

.footer-bottom p {
    opacity: 0.8;
    margin: 0.25rem 0;
}

.footer-tagline {
    color: var(--accent);
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1.1rem;
    }

    .calculator-card {
        padding: 2rem 1.5rem;
    }

    .button-group {
        flex-direction: column;
    }

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

    .features-section h2,
    .how-to-section h2,
    .faq-section h2 {
        font-size: 2rem;
    }

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

    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .cta-text h2 {
        font-size: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .content-article {
        padding: 2rem 1.5rem;
    }

    .recommendation-card {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .tool-section {
        padding: 3rem 0;
    }

    .result-value {
        font-size: 1.25rem;
    }

    .step {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }
}