/* ===== CSS Variables - Color Scheme Inspired by Fun Run Flyer ===== */
:root {
    /* Primary colors from flyer - vibrant and energetic */
    --primary-color: #FF6B35;        /* Energetic orange/red */
    --secondary-color: #004E89;       /* Deep blue */
    --accent-color: #F7B801;          /* Bright yellow/gold */
    --success-color: #4CAF50;
    --danger-color: #F44336;
    
    /* Neutral colors */
    --dark-color: #1A1A2E;
    --light-bg: #F5F7FA;
    --white: #FFFFFF;
    --gray-100: #F8F9FA;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #CED4DA;
    --gray-500: #ADB5BD;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    
    /* Typography */
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-secondary);
    color: var(--dark-color);
    line-height: 1.6;
    background-color: var(--white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xxl) 0;
}

.bg-light {
    background-color: var(--light-bg);
}

.section-title {
    text-align: center;
    color: var(--dark-color);
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-description {
    text-align: center;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #FF8C42);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background-color: #003D6B;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-control {
    background-color: var(--white);
    border: 2px solid var(--gray-300);
    padding: 0.5rem 1rem;
    font-size: 1.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-control:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* ===== Header & Navigation ===== */
header {
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: var(--spacing-sm) 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 1.5rem;
    margin-bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    font-family: var(--font-primary);
    font-weight: 600;
    color: var(--dark-color);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link.btn-register {
    background: linear-gradient(135deg, var(--primary-color), #FF8C42);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-lg);
}

.nav-link.btn-register::after {
    display: none;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    margin: 3px 0;
    transition: all var(--transition-normal);
}

/* ===== Hero Section ===== */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    background: linear-gradient(135deg, #FFF5F0 0%, #F0F8FF 100%);
    min-height: 600px;
}

.hero-content {
    padding: var(--spacing-lg);
}

.hero-title {
    font-size: 3rem;
    color: var(--dark-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    object-fit: cover;
}

/* ===== Calendar Section ===== */
.calendar-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.current-month {
    font-size: 1.75rem;
    color: var(--dark-color);
    min-width: 250px;
    text-align: center;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background-color: var(--gray-300);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.calendar-day-header,
.calendar-day {
    background-color: var(--white);
    padding: var(--spacing-sm);
    text-align: center;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.calendar-day-header {
    font-weight: 700;
    color: var(--dark-color);
    background-color: var(--secondary-color);
    color: var(--white);
    min-height: 50px;
}

.calendar-day {
    cursor: pointer;
    transition: background-color var(--transition-fast);
    position: relative;
}

.calendar-day:hover {
    background-color: var(--light-bg);
}

.calendar-day.other-month {
    color: var(--gray-400);
}

.calendar-day.today {
    background-color: var(--accent-color);
    font-weight: 700;
    color: var(--dark-color);
}

.calendar-day.has-event {
    background-color: #FFE8DC;
    font-weight: 600;
}

.calendar-day.has-event::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.event-details {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.event-card {
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background-color: var(--light-bg);
    border-radius: var(--radius-md);
}

.event-card:last-child {
    margin-bottom: 0;
}

.event-card h4 {
    color: var(--dark-color);
    margin-bottom: var(--spacing-xs);
}

.event-card .event-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.event-card .event-description {
    color: var(--gray-700);
}

/* ===== Past Runs Section ===== */
.filter-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background-color: var(--white);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: var(--white);
}

.past-runs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.run-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    cursor: pointer;
}

.run-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.run-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.run-card-content {
    padding: var(--spacing-md);
}

.run-card-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

.run-card-date {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.run-card-description {
    color: var(--gray-700);
    line-height: 1.5;
}

.run-card-tags {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    padding: 0.25rem 0.75rem;
    background-color: var(--light-bg);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    color: var(--gray-700);
}

.tag.social {
    background-color: #E3F2FD;
    color: var(--secondary-color);
}

.tag.fun {
    background-color: #FFF3E0;
    color: var(--primary-color);
}

/* ===== Parcours Section ===== */
.parcours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.parcours-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.parcours-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.parcours-map {
    width: 100%;
    height: 250px;
    background-color: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    font-size: 3rem;
}

.parcours-content {
    padding: var(--spacing-lg);
}

.parcours-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-md);
}

.parcours-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.parcours-stats {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.parcours-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
}

.parcours-stat strong {
    color: var(--primary-color);
}

.parcours-description {
    color: var(--gray-700);
    margin-bottom: var(--spacing-md);
}

.parcours-member {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* ===== Blog Section ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.blog-card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.blog-card-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.blog-card-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.blog-card-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.blog-card-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--dark-color);
}

.blog-card-excerpt {
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.blog-card-link {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.blog-card-link:hover {
    color: var(--secondary-color);
}

#load-more-blog {
    display: block;
    margin: 0 auto;
}

/* ===== Registration Section ===== */
.registration-section {
    background: linear-gradient(135deg, #FFF5F0 0%, #F0F8FF 100%);
}

.registration-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.registration-info {
    padding: var(--spacing-lg);
}

.info-cards {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.info-card {
    background-color: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: start;
    gap: var(--spacing-md);
}

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

.info-card h4 {
    margin-bottom: var(--spacing-xs);
    color: var(--dark-color);
}

.info-card p {
    color: var(--gray-600);
    margin: 0;
}

.registration-form-container {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--dark-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-secondary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.btn-submit {
    width: 100%;
    margin-top: var(--spacing-md);
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-message.success {
    background-color: #D4EDDA;
    color: #155724;
    display: block;
}

.form-message.error {
    background-color: #F8D7DA;
    color: #721C24;
    display: block;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--gray-400);
    margin-bottom: var(--spacing-xs);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--gray-700);
    color: var(--gray-400);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--white);
        width: 100%;
        text-align: center;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        grid-template-columns: 1fr;
        padding: var(--spacing-lg) var(--spacing-md);
    }

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

    .registration-container {
        grid-template-columns: 1fr;
    }

    .calendar-grid {
        font-size: 0.85rem;
    }

    .calendar-day,
    .calendar-day-header {
        min-height: 60px;
    }

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

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

    .past-runs-grid {
        grid-template-columns: 1fr;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .calendar-controls {
        gap: var(--spacing-sm);
    }

    .current-month {
        font-size: 1.25rem;
        min-width: 180px;
    }

    .filter-controls {
        gap: var(--spacing-xs);
    }

    .filter-btn {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== Loading Spinner ===== */
.spinner {
    border: 4px solid var(--gray-300);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: var(--spacing-lg) auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}