/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    width: 100%;
}

/* Home Page */
.home-page {
    background-color: var(--bg-color);
    border-radius: 8px;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
}

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

.hero-description {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.calculators-grid h2,
.categories-section h2,
.features h2,
.content-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

.categories-section {
    margin-bottom: 4rem;
}

.categories-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.category-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    margin-bottom: 1rem;
}

.category-card h3 a {
    color: var(--text-color);
    text-decoration: none;
}

.category-card h3 a:hover {
    color: var(--primary-color);
}

.category-card p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.calculator-count {
    font-weight: 600;
    color: var(--primary-color) !important;
    margin-bottom: 1.5rem !important;
}

.disclaimer-box {
    background-color: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.disclaimer-box h3 {
    color: #856404;
    margin-bottom: 1rem;
}

.disclaimer-box p {
    color: #856404;
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.result-category {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.bmi-chart {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.bmi-chart h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.bmi-chart ul {
    list-style: none;
    padding: 0;
}

.bmi-chart li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
}

.bmi-chart li:last-child {
    border-bottom: none;
}

.height-input-group {
    display: flex;
    gap: 0.5rem;
}

.height-input-group input {
    flex: 1;
}

.height-input-group select {
    width: auto;
    min-width: 100px;
}

.development-box {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    border-left: 4px solid var(--primary-color);
}

.development-box h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.development-box p {
    color: var(--text-light);
    line-height: 1.8;
}

.food-database-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.food-database-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.food-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-color);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.food-table thead {
    background-color: var(--primary-color);
    color: white;
}

.food-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.food-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

.food-table tbody tr:hover {
    background-color: var(--bg-light);
}

.food-table tbody tr:last-child td {
    border-bottom: none;
}

.recommendations-box {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
    border-left: 4px solid var(--primary-color);
}

.recommendations-box h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.recommendations-box li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
    line-height: 1.8;
}

.recommendations-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.calculators-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.calculator-card {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.calculator-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.calculator-card h3 {
    margin-bottom: 1rem;
}

.calculator-card h3 a {
    color: var(--text-color);
    text-decoration: none;
}

.calculator-card h3 a:hover {
    color: var(--primary-color);
}

.calculator-card p {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.btn-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

.btn-link:hover {
    color: var(--primary-dark);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature-item {
    padding: 1.5rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.feature-item h3 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
}

.content-section {
    background-color: var(--bg-color);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.content-section h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.content-section ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.content-section li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

/* Calculator Page */
.calculator-page {
    background-color: var(--bg-color);
    border-radius: 8px;
    padding: 2rem;
}

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

.intro {
    margin-bottom: 2rem;
    color: var(--text-light);
    font-size: 1.1rem;
}

/* Forms */
.calculator-form {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    min-width: 200px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input[type="number"] {
    min-width: 250px;
    font-size: 1.1rem;
    padding: 0.875rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: 0.5rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.time-input-group {
    display: flex;
    gap: 0.5rem;
}

.time-input-group input {
    flex: 1;
}

.time-input-group select {
    width: auto;
    min-width: 120px;
}

.form-help {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--primary-color);
}

.form-help p {
    margin-bottom: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.btn-calculate {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-calculate:hover {
    background-color: var(--primary-dark);
}

/* Results */
.result-box {
    background-color: var(--bg-light);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 2px solid var(--success-color);
}

.result-box h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.result-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.result-details {
    margin-bottom: 1rem;
}

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

.result-item.total {
    border-bottom: none;
    border-top: 2px solid var(--primary-color);
    margin-top: 0.5rem;
    padding-top: 1rem;
    font-weight: 600;
}

.result-label {
    color: var(--text-light);
}

.result-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.result-explanation {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.formula-box {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}

.formula-box strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.formula-box code {
    display: block;
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

/* Sections */
.formulas-section,
.examples-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.formulas-section h2,
.examples-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.formulas-list {
    display: grid;
    gap: 1.5rem;
}

.formula-item {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.formula-item h3 {
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.formula-item p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.examples-list {
    display: grid;
    gap: 1.5rem;
}

.example-item {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.example-item h3 {
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.example-item p {
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.example-calculation {
    background-color: var(--bg-color);
    padding: 1rem;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
}

/* FAQ */
.faq-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.faq-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.faq-list {
    display: grid;
    gap: 1.5rem;
}

.faq-item {
    background-color: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.faq-question {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

.faq-answer {
    color: var(--text-light);
    line-height: 1.8;
}

/* Footer */
.footer {
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer p {
    color: var(--text-light);
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
}

.footer-nav a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .container {
        padding: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .calculators-list {
        grid-template-columns: 1fr;
    }

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

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

    .time-input-group {
        flex-direction: column;
    }

    .time-input-group select {
        width: 100%;
    }
}