/*
 * Shallow Dives - Modern Editorial Design
 * Bold contemporary magazine aesthetic
 */

/* ===================================
   1. CSS RESET & BASE STYLES
   =================================== */

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

:root {
    /* Color Palette */
    --color-primary: #0d7377;
    --color-navy: #14213d;
    --color-accent: #e07a5f;
    --color-bg: #faf9f6;
    --color-card: #ffffff;
    --color-border: #e8e8e8;
    --color-text-primary: #2d3748;
    --color-text-secondary: #6c757d;

    /* Topic Colors */
    --color-philosophy: #6366f1;
    --color-science: #10b981;
    --color-arts: #f59e0b;
    --color-social: #ec4899;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===================================
   2. TYPOGRAPHY
   =================================== */

body {
    font-family: "Iowan Old Style", "Palatino Linotype", "URW Palladio L", P052, serif;
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    font-size: 18px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-navy);
}

h1 {
    font-size: 2.75rem;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--color-accent);
}

/* ===================================
   3. LAYOUT & GRID
   =================================== */

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: 750px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   4. HEADER & NAVIGATION
   =================================== */

header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-navy) 100%);
    color: white;
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-md);
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-arts) 100%);
}

header .container {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

header .header-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

header h1 {
    font-size: 2.5rem;
    margin: 0;
    color: white;
    font-weight: 800;
    letter-spacing: -0.03em;
}

header .tagline {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
    margin: 0;
}

nav {
    display: flex;
    gap: var(--spacing-lg);
    padding: 0;
    border: none;
}

nav a {
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
}

/* ===================================
   5. HERO SECTION
   =================================== */

.hero {
    background: linear-gradient(135deg, rgba(13, 115, 119, 0.05) 0%, rgba(224, 122, 95, 0.05) 100%);
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-xl);
}

.hero-content {
    background-color: var(--color-card);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    border-left: 6px solid var(--color-accent);
}

.hero-badge {
    display: inline-block;
    background-color: var(--color-accent);
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   6. INTRO SECTION
   =================================== */

.intro {
    background-color: var(--color-card);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--color-primary);
}

.intro p {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===================================
   7. ARTICLE CARDS & CONTENT
   =================================== */

.article {
    background-color: var(--color-card);
    padding: var(--spacing-2xl);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
}

.article-meta {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
}

.article-meta .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.article-meta strong {
    color: var(--color-navy);
    font-weight: 600;
}

.article h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.article h2 {
    font-size: 1.75rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
}

.article h3 {
    font-size: 1.35rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content {
    font-size: 1.15rem;
    line-height: 1.9;
}

.article-content p {
    margin-bottom: var(--spacing-lg);
}

.article-content ul, .article-content ol {
    margin-bottom: var(--spacing-lg);
    margin-left: 2rem;
}

.article-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.article-content a {
    color: var(--color-primary);
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.article-content a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.article-content blockquote {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: rgba(13, 115, 119, 0.05);
    border-left: 4px solid var(--color-primary);
    font-style: italic;
    border-radius: 6px;
}

.article-content code {
    background-color: #f4f4f4;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.article-content pre {
    background-color: #f4f4f4;
    padding: var(--spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

.article-content pre code {
    background-color: transparent;
    padding: 0;
}

/* ===================================
   8. TAGS
   =================================== */

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

.tag {
    display: inline-block;
    background-color: rgba(13, 115, 119, 0.1);
    color: var(--color-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid transparent;
}

.tag:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   9. CATALOGUE & FILTERS
   =================================== */

.filters {
    background-color: var(--color-card);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.filters h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
}

.filters form {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: var(--spacing-md);
    align-items: end;
}

.filter-group {
    display: flex;
    flex-direction: column;
}

.filter-group label {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.filter-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background-color: white;
    transition: var(--transition);
    cursor: pointer;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.1);
}

.filter-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===================================
   10. BUTTONS
   =================================== */

button, .btn {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    padding: 0.75rem 1.75rem;
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

button:hover, .btn:hover {
    background-color: var(--color-navy);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-text-secondary);
}

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

/* ===================================
   11. ARTICLE LIST
   =================================== */

.article-list {
    background-color: var(--color-card);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.article-list h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--color-navy);
}

.article-item {
    padding: var(--spacing-xl) 0;
    border-bottom: 2px solid var(--color-border);
    transition: var(--transition);
}

.article-item:last-child {
    border-bottom: none;
}

.article-item:hover {
    transform: translateX(8px);
}

.article-item h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-item h3 a {
    color: var(--color-navy);
    transition: var(--transition);
}

.article-item h3 a:hover {
    color: var(--color-primary);
}

.article-item .meta {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.article-item .meta span {
    display: inline-flex;
    align-items: center;
}

.article-item .summary {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
}

/* ===================================
   12. UTILITY CLASSES
   =================================== */

.no-articles {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-secondary);
}

.active-filters {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
}

.back-link {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
}

.back-link a {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-link a:hover {
    color: var(--color-accent);
    transform: translateX(-4px);
}

/* ===================================
   13. RESPONSIVE DESIGN
   =================================== */

@media (max-width: 768px) {
    :root {
        font-size: 16px;
    }

    h1 {
        font-size: 2.25rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .article h1 {
        font-size: 2.25rem;
    }

    .filters form {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        width: 100%;
    }

    .filter-buttons button,
    .filter-buttons .btn {
        flex: 1;
    }

    header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    nav {
        padding-top: var(--spacing-xs);
        border-top: 1px solid rgba(255, 255, 255, 0.2);
        width: 100%;
    }

    .article-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .container,
    .container-narrow {
        padding: 0 var(--spacing-md);
    }

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

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

@media (max-width: 480px) {
    header {
        padding: var(--spacing-xs) 0;
    }

    .hero {
        padding: var(--spacing-lg) 0;
    }

    .article-item:hover {
        transform: none;
    }
}