/* CSS Variables for consistent theming */
:root {
    --primary-color: #7868E6;
    --secondary-color: #B8B5FF;
    --accent-color: #FFB4B4;
    --light-bg: #EDEEF7;
    --lightest-bg: #E4FBFF;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(120, 104, 230, 0.1);
    --shadow-hover: 0 4px 20px rgba(120, 104, 230, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, var(--lightest-bg) 0%, var(--light-bg) 100%);
    min-height: 100vh;
    position: relative;
}

/* Paper texture effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 1px 1px, rgba(120, 104, 230, 0.05) 1px, transparent 0);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: -1;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
    box-shadow: var(--shadow);
}

.header__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header__subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

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

.nav__list {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 1rem 0;
}

.nav__item {
    margin: 0 1rem;
}

.nav__link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.nav__link:hover,
.nav__link--active {
    background: var(--secondary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* Main content */
.main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

/* Search section */
.search-section {
    margin-bottom: 2rem;
}

.search-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--white);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(120, 104, 230, 0.1);
}

.search-btn {
    padding: 1rem;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    min-width: 60px;
}

.search-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.search-icon {
    font-size: 1.2rem;
}

/* Filter container */
.filter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    background: var(--white);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(120, 104, 230, 0.1);
}

.favorites-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.favorites-btn:hover {
    background: #ff9999;
    transform: translateY(-2px);
}

.favorites-count {
    background: var(--white);
    color: var(--accent-color);
    padding: 0.2rem 0.5rem;
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

/* Loading spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: var(--text-light);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--light-bg);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Cards container */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    padding: 1rem 0;
}

/* Card styles */
.milestone-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.milestone-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

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

.milestone-card--favorite {
    border: 2px solid var(--accent-color);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.card-age {
    background: var(--secondary-color);
    color: var(--white);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

.favorite-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.25rem;
    border-radius: 50%;
}

.favorite-btn:hover {
    background: var(--light-bg);
    transform: scale(1.1);
}

.favorite-btn--active {
    color: var(--accent-color);
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.card-description {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.card-section {
    margin-bottom: 1rem;
}

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

.section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-list {
    list-style: none;
    padding-left: 0;
}

.section-list li {
    padding: 0.25rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.section-list li::before {
    content: '•';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.alert-item {
    color: var(--accent-color);
    font-weight: 500;
}

.alert-item::before {
    content: '⚠️';
    margin-right: 0.5rem;
}

/* No results */
.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

.clear-search-btn {
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.clear-search-btn:hover {
    background: var(--secondary-color);
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    font-size: 0.80rem;
    line-height: 1.5;
}

.footer__links p,
.footer__disclaimer,
.footer p {
  margin: 0.5rem 0;
}


.footer__text {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header__title {
        font-size: 2rem;
    }
    
    .header__subtitle {
        font-size: 1rem;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    .search-btn {
        width: 100%;
    }
    
    .filter-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-select,
    .favorites-btn {
        width: 100%;
        justify-content: center;
    }
    
    .cards-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .milestone-card {
        padding: 1rem;
    }
    
    .nav__list {
        flex-direction: column;
        align-items: center;
    }
    
    .nav__item {
        margin: 0.25rem 0;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1.5rem 0;
    }
    
    .header__title {
        font-size: 1.8rem;
    }
    
    .main {
        padding: 1rem 0;
    }
    
    .milestone-card {
        padding: 0.75rem;
    }
    
    .card-title {
        font-size: 1.1rem;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
}