/* 
* BMI Calculator - Main Stylesheet
* SEO-optimized for weight loss and BMI calculation
* Modern design with improved user experience
*/

/* Base Styles and Typography */
:root {
    --primary-color: #3F51B5;
    --primary-dark: #303F9F;
    --primary-light: #C5CAE9;
    --accent-color: #FF4081;
    --secondary-color: #00BCD4;
    --text-color: #212121;
    --text-light: #757575;
    --background-color: #FFFFFF;
    --background-alt: #F5F7FA;
    --border-color: #E0E0E0;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --info-color: #2196F3;
    --shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 5px 15px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --transition: all 0.3s ease;
    --font-heading: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-body: 'Open Sans', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    background-image: linear-gradient(to bottom, #ffffff, #f9faff);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    line-height: 1.3;
    color: var(--text-color);
    font-weight: 700;
    font-family: var(--font-heading);
}

h1 {
    font-size: 2.5rem;
    margin-top: 0;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
    letter-spacing: -0.3px;
}

h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    letter-spacing: -0.2px;
}

p {
    margin-bottom: 1.5rem;
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

ul, ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* Header Styles */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 2.5rem 0;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(255, 255, 255, 0.15) 0%, transparent 40%);
    pointer-events: none;
}

header h1 {
    color: white;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* Navigation Styles */
.main-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0;
}

.main-nav li {
    margin: 0.5rem;
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.6rem 1.2rem;
    border-radius: var(--border-radius-sm);
    background-color: rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    font-weight: 600;
    display: block;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.5);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.main-nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    text-decoration: none;
    transform: translateY(-2px);
}

.main-nav a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Special styling for Free Guide link */
.main-nav li:last-child a {
    background-color: var(--accent-color);
    padding: 0.7rem 1.4rem;
    font-weight: 700;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
    animation: pulse 2s infinite;
}

.main-nav li:last-child a:hover {
    background-color: #ff5a9e;
    transform: translateY(-3px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.25);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 64, 129, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(255, 64, 129, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(255, 64, 129, 0);
    }
}

/* Breadcrumb Navigation */
.breadcrumbs {
    margin-bottom: 1.5rem;
}

.breadcrumbs ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.875rem;
}

.breadcrumbs li {
    margin: 0;
}

.breadcrumbs li:not(:last-child)::after {
    content: "›";
    margin: 0 0.5rem;
    color: var(--text-light);
}

.breadcrumbs a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumbs li:last-child {
    color: var(--text-light);
}

/* Main Content Sections */
main {
    padding: 3rem 0;
}

.content-section {
    margin-bottom: 3.5rem;
    padding: 2.5rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.content-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

.content-section:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

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

.content-text {
    flex: 1;
}

.content-image {
    flex: 1;
    text-align: center;
}

/* BMI Calculator Styles */
.calculator-section {
    background-color: var(--background-alt);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 3.5rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.calculator-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
}

.calculator-container {
    max-width: 600px;
    margin: 0 auto;
}

.units-toggle {
    display: flex;
    justify-content: space-around;
    margin-bottom: 2rem;
    padding: 0.5rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius-sm);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.units-toggle label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 0.7rem 1.2rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    font-weight: 500;
}

.units-toggle label:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.units-toggle input[type="radio"] {
    margin-right: 0.5rem;
    accent-color: var(--primary-color);
}

.units-toggle input[type="radio"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.input-with-unit {
    display: flex;
    align-items: center;
}

.input-with-unit input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    font-size: 1rem;
}

.input-with-unit .unit {
    padding: 0.75rem;
    background-color: var(--primary-light);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-weight: 600;
    min-width: 50px;
    text-align: center;
}

.error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.calculate-btn {
    display: block;
    width: 100%;
    padding: 1.1rem;
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.calculate-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.calculate-btn:hover {
    background: linear-gradient(to right, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}

.calculate-btn:hover::after {
    left: 100%;
}

/* Results Styles */
.result-container {
    margin-top: 2.5rem;
    padding: 2rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.result-container:not(.hidden) {
    animation: fadeIn 0.5s ease-in-out;
}

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

.result-container.hidden {
    display: none;
}

.bmi-value {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.5rem;
}

#bmi-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

#bmi-category {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.bmi-scale {
    margin-bottom: 1.5rem;
}

.scale-bar {
    display: flex;
    height: 40px;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.marker {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.25rem;
    position: relative;
}

.marker span {
    z-index: 1;
}

.marker .value {
    font-size: 0.75rem;
    opacity: 0.9;
}

.underweight {
    background-color: var(--info-color);
}

.normal {
    background-color: var(--success-color);
}

.overweight {
    background-color: var(--warning-color);
}

.obese {
    background-color: var(--danger-color);
}

.suggestion-box {
    padding: 1rem;
    background-color: var(--primary-light);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.cta-button {
    display: block;
    width: 100%;
    padding: 1.1rem;
    background: linear-gradient(to right, var(--accent-color), #ff6a9c);
    color: white;
    text-align: center;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.cta-button::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.cta-button:hover {
    background: linear-gradient(to right, #ff5a9e, var(--accent-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
    text-decoration: none;
}

.cta-button:hover::after {
    left: 100%;
}

/* Strategy Cards */
.strategies-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.strategy-card {
    padding: 2rem;
    background-color: var(--background-alt);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.strategy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.strategy-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.strategy-card h3 {
    color: var(--primary-color);
    margin-top: 0;
}

/* FAQ Styles */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.faq-item {
    padding: 1.5rem;
    background-color: var(--background-alt);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.faq-item h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Email Signup Section */
.email-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: white;
    padding: 3.5rem 2.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 3.5rem;
    box-shadow: var(--shadow-hover);
    position: relative;
    overflow: hidden;
}

.email-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 30%),
        radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 20%);
    pointer-events: none;
}

.email-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.email-section h2 {
    color: white;
}

.email-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.email-section h2 {
    color: white;
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.email-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 2rem 0;
}

.email-form input {
    padding: 1.2rem;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.email-form input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.submit-btn {
    padding: 1.2rem;
    background: linear-gradient(to right, var(--accent-color), #ff6a9c);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.submit-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.submit-btn:hover {
    background: linear-gradient(to right, #ff5a9e, var(--accent-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.25);
}

.submit-btn:hover::after {
    left: 100%;
}

.privacy-note {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0;
}

/* Footer Styles */
footer {
    background-color: var(--text-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.disclaimer {
    font-size: 0.875rem;
    opacity: 0.8;
    max-width: 800px;
    margin: 1rem auto;
}

.footer-links {
    margin-top: 1.5rem;
}

.footer-links a {
    color: white;
    margin: 0 0.5rem;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: none;
}

.last-updated {
    font-size: 0.75rem;
    margin-top: 1rem;
    opacity: 0.7;
}

/* Responsive Styles */
@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .main-nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .main-nav li {
        margin: 0.25rem;
        width: 100%;
        max-width: 200px;
    }
    
    /* Make Free Guide button full width and more prominent on mobile */
    .main-nav li:last-child {
        margin-top: 0.75rem;
        max-width: 250px;
    }
    
    .main-nav li:last-child a {
        padding: 0.8rem 1.5rem;
    }
    
    .email-form {
        flex-direction: column;
    }
    
    .email-form input,
    .submit-btn {
        border-radius: var(--border-radius-sm);
        margin-bottom: 0.5rem;
    }
    
    .content-section,
    .calculator-section {
        padding: 1.5rem;
    }
}

@media (min-width: 481px) and (max-width: 767px) {
    h1 {
        font-size: 2rem;
    }
    
    .main-nav ul {
        justify-content: center;
    }
    
    .main-nav li {
        margin: 0.25rem 0.5rem;
    }
}

@media (min-width: 768px) {
    .content-with-image {
        flex-direction: row;
        align-items: center;
        gap: 3rem;
    }
    
    .strategies-container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .email-form {
        flex-direction: row;
    }
    
    .email-form input {
        flex: 1;
        border-radius: var(--border-radius-sm) 0 0 var(--border-radius-sm);
    }
    
    .submit-btn {
        border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    }
    
    /* Two-column layout for email signup section */
    .email-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .email-section h2 {
        font-size: 2.5rem;
    }
    
    .email-section p {
        font-size: 1.1rem;
        max-width: 80%;
        margin: 0 auto 1rem;
    }
}

/* SEO Optimization - Adding keyword-rich classes */
.bmi-calculator-tool,
.weight-loss-guide,
.healthy-weight-calculator,
.body-mass-index-calculator {
    /* These classes can be added to relevant sections for SEO */
    display: block;
}

/* Accessibility Improvements */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Print Styles */
@media print {
    header, footer, .email-section, .cta-button {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .container {
        width: 100%;
        max-width: none;
        padding: 0;
    }
    
    .result-container {
        page-break-inside: avoid;
    }
}