/* ==========================================================================
   Asthma and Allergies Educational Website - Pastel Theme Stylesheet
   Soft pastel palette: Light blues, warm beiges, whites, and sage greens.
   ========================================================================== */

:root {
    --bg-primary: #fbfbf8;
    --bg-secondary: #f4f6f0;
    --bg-card: #ffffff;
    --bg-accent-soft: #eaf4f4;
    --bg-beige-soft: #f6f4ed;
    --bg-green-soft: #edf5f1;
    --bg-blue-soft: #eef6f8;

    --color-primary: #52796f;
    --color-primary-dark: #2f4f4f;
    --color-sage: #6b9080;
    --color-mint: #a4c3b2;
    --color-seafoam: #cce3de;
    --color-ice-blue: #eaf4f4;
    --color-warm-beige: #e9e4d4;
    --color-sand: #f0ece1;
    --color-terracotta: #e29578;
    
    --text-primary: #2d3e38;
    --text-secondary: #4a635a;
    --text-muted: #6c827a;
    --text-light: #ffffff;

    --border-color: #e2ebe6;
    --border-soft: #eef3f0;
    
    --shadow-sm: 0 2px 8px rgba(82, 121, 111, 0.06);
    --shadow-md: 0 6px 20px rgba(82, 121, 111, 0.09);
    --shadow-lg: 0 12px 32px rgba(82, 121, 111, 0.12);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-heading: 'Lora', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --transition: all 0.25s ease-in-out;
}

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

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

body {
    font-family: var(--font-body), sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Layout Containers */
.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

main {
    flex: 1 0 auto;
    padding: 40px 0 60px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading), serif;
    color: var(--color-primary-dark);
    line-height: 1.35;
    font-weight: 600;
}

h1 {
    font-size: 2.25rem;
    margin-bottom: 1.25rem;
    letter-spacing: -0.01em;
}

h2 {
    font-size: 1.75rem;
    margin-top: 1.75rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

h3 {
    font-size: 1.35rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    font-size: 1.05rem;
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration-thickness: 2px;
}

/* Header & Navigation */
.site-header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-primary-dark);
    font-family: var(--font-heading), serif;
    font-size: 1.2rem;
    font-weight: 700;
}

.logo-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--color-seafoam), var(--color-mint));
    border-radius: 10px;
    font-size: 1.2rem;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 1.15rem;
    line-height: 1.2;
}

.brand-domain {
    font-family: var(--font-body), sans-serif;
    font-size: 0.75rem;
    color: var(--color-sage);
    font-weight: 500;
    letter-spacing: 0.04em;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 6px;
    align-items: center;
}

.main-nav a {
    display: block;
    padding: 8px 14px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.main-nav a:hover {
    background-color: var(--bg-accent-soft);
    color: var(--color-primary-dark);
}

.main-nav a.active {
    background-color: var(--bg-green-soft);
    color: var(--color-primary-dark);
    font-weight: 600;
    border: 1px solid var(--color-mint);
}

/* Mobile Nav Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background-color: var(--color-primary-dark);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}

/* Page Banner / Hero Card */
.page-hero {
    background: linear-gradient(135deg, #ffffff 0%, var(--bg-blue-soft) 50%, var(--bg-beige-soft) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 40px;
    margin-bottom: 36px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.page-hero::after {
    content: '';
    position: absolute;
    top: -40px;
    right: -40px;
    width: 180px;
    height: 180px;
    background: radial-gradient(circle, var(--color-seafoam) 0%, transparent 70%);
    opacity: 0.6;
    pointer-events: none;
}

.page-hero h1 {
    margin-bottom: 0.75rem;
}

.hero-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--bg-green-soft);
    border: 1px solid var(--color-mint);
    color: var(--color-primary);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    border-radius: 20px;
    margin-bottom: 12px;
}

/* Content Cards & Sections */
.content-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px;
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
}

.content-card.pastel-bg-blue {
    background-color: var(--bg-blue-soft);
    border-color: #dbeae6;
}

.content-card.pastel-bg-beige {
    background-color: var(--bg-beige-soft);
    border-color: #ece7db;
}

.content-card.pastel-bg-green {
    background-color: var(--bg-green-soft);
    border-color: #dcebe2;
}

/* Topic Navigation Grid for Home Page */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin: 24px 0 32px;
}

.topic-box {
    display: flex;
    flex-direction: column;
    padding: 20px 22px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.topic-box:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-mint);
    background-color: #ffffff;
}

.topic-icon {
    font-size: 1.75rem;
    margin-bottom: 12px;
}

.topic-title {
    font-family: var(--font-heading), serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: 6px;
}

.topic-action {
    margin-top: auto;
    font-size: 0.85rem;
    color: var(--color-sage);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Side-by-Side Illustration Layout */
.content-with-media {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 32px;
    align-items: center;
}

.media-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

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

/* Figure 1 Image Container & APA Caption */
.figure-container {
    margin: 32px 0 24px;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.figure-image-wrap {
    text-align: center;
    margin-bottom: 18px;
}

.figure-image-wrap img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.figure-caption {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-soft);
    padding-top: 14px;
}

.figure-number {
    font-weight: 700;
    color: var(--color-primary-dark);
    display: block;
    margin-bottom: 2px;
}

.figure-title {
    font-style: italic;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 6px;
}

.figure-note {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Resource Links List */
.resource-links-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 22px 26px;
    margin: 18px 0 24px;
}

.resource-link-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-soft);
    word-break: break-all;
}

.resource-link-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* Callout & Disclaimer Boxes */
.disclaimer-card {
    background-color: var(--bg-beige-soft);
    border-left: 4px solid var(--color-sage);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 20px 24px;
    margin-top: 28px;
    font-size: 0.98rem;
    color: var(--text-secondary);
}

.disclaimer-card strong {
    color: var(--color-primary-dark);
}

/* APA 7 References Page Specific Formatting */
.references-page-header {
    text-align: center;
    margin-bottom: 36px;
}

.references-page-header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
}

.apa-references-list {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px;
    box-shadow: var(--shadow-sm);
}

.apa-entry {
    padding-left: 2.5rem;
    text-indent: -2.5rem;
    line-height: 2.0;
    margin-bottom: 1.5rem;
    font-size: 1.02rem;
    color: var(--text-primary);
    word-break: break-word;
}

.apa-entry:last-child {
    margin-bottom: 0;
}

.apa-entry em {
    font-style: italic;
    color: var(--color-primary-dark);
}

/* Footer */
.site-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 40px 0 28px;
    margin-top: auto;
    font-size: 0.92rem;
    color: var(--text-muted);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 8px;
    max-width: 380px;
}

.footer-nav-col h4 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary-dark);
    margin-bottom: 12px;
}

.footer-nav-col ul {
    list-style: none;
}

.footer-nav-col li {
    margin-bottom: 8px;
}

.footer-nav-col a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer-nav-col a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.footer-bottom {
    border-top: 1px solid var(--border-soft);
    padding-top: 20px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 860px) {
    .mobile-toggle {
        display: block;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        padding: 16px 24px;
    }

    .main-nav.open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .main-nav a {
        padding: 12px 16px;
        font-size: 0.96rem;
    }

    .content-with-media {
        grid-template-columns: 1fr;
    }

    .media-container {
        order: -1;
        max-width: 320px;
        margin: 0 auto 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .page-hero {
        padding: 24px;
    }

    .content-card {
        padding: 22px;
    }

    .apa-references-list {
        padding: 24px 20px;
    }

    .apa-entry {
        padding-left: 1.75rem;
        text-indent: -1.75rem;
        font-size: 0.95rem;
        line-height: 1.8;
    }
}