/**
 * ZIP Flap Website - Main Stylesheet
 * 
 * Organized CSS for the entire website.
 * 
 * @package ZIPFlap
 * @version 2.0
 */

/* ============================================================================
   CSS VARIABLES (Custom Properties)
   ============================================================================ */

:root {
    /* Primary Colors */
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --accent-teal: #0d9488;
    --highlight-color: #059669;
    --highlight-amber: #fbbf24;
    
    /* Text Colors */
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    
    /* Background Colors */
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --bg-dark: #1e3a8a;
    
    /* Border Colors */
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Status Colors */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --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 25px 50px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 5rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Container */
    --container-max-width: 1280px;
    --container-padding: 2rem;
}

/* ============================================================================
   RESET & BASE STYLES
   ============================================================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: var(--primary-blue);
}

/* ============================================================================
   TYPOGRAPHY
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

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

/* ============================================================================
   ZIP HIGHLIGHTING
   ============================================================================ */

.zip-highlight {
    color: var(--highlight-color);
    font-weight: 700;
}

.zip-full-highlight {
    color: var(--highlight-color);
    font-weight: 700;
    background: linear-gradient(135deg, rgba(5, 150, 105, 0.1) 0%, rgba(13, 148, 136, 0.1) 100%);
    padding: 0.1em 0.3em;
    border-radius: var(--radius-sm);
}

/* ============================================================================
   LAYOUT & CONTAINERS
   ============================================================================ */

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

.section {
    padding: var(--spacing-4xl) var(--container-padding);
}

.section-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-light);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================================================
   NAVIGATION
   ============================================================================ */

.main-nav {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--container-padding);
}

.logo {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
}

.logo:hover {
    color: var(--primary-blue);
}

.logo .zip-highlight {
    color: var(--highlight-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-links a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    padding: var(--spacing-sm) 0;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--secondary-blue);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.mobile-menu-overlay.active {
    display: block;
    opacity: 1;
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100%;
    background: var(--bg-white);
    z-index: 1000;
    transition: right var(--transition-normal);
    box-shadow: var(--shadow-xl);
    padding-top: 80px;
    overflow-y: auto;
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-links {
    list-style: none;
    padding: 0;
}

.mobile-nav-links li {
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-links a {
    display: block;
    padding: var(--spacing-md) var(--spacing-xl);
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.mobile-nav-links a:hover {
    background: var(--bg-light);
    color: var(--secondary-blue);
    padding-left: calc(var(--spacing-xl) + 0.5rem);
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.hero {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--bg-white);
    padding: var(--spacing-3xl) var(--container-padding);
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-content h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    color: var(--bg-white);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    font-weight: 300;
}

.hero-subtitle .zip-full-highlight {
    background: rgba(255, 255, 255, 0.2);
    color: #34d399;
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    opacity: 0.9;
}

.hero-image-container {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    background: #000;
}

.hero-image {
    width: 100%;
    height: 100%;
    min-height: 400px;
    display: block;
    object-fit: cover;
    object-position: center;
}

.hero-image-caption {
    background: rgba(0, 0, 0, 0.7);
    color: var(--bg-white);
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
    text-align: center;
}

/* ============================================================================
   BUTTONS
   ============================================================================ */

.btn {
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: inline-block;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--bg-white);
    color: var(--primary-blue);
}

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

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid var(--bg-white);
}

.btn-secondary:hover {
    background: var(--bg-white);
    color: var(--primary-blue);
}

.btn-blue {
    background: var(--secondary-blue);
    color: var(--bg-white);
}

.btn-blue:hover {
    background: var(--primary-blue);
    color: var(--bg-white);
}

.btn-green {
    background: var(--highlight-color);
    color: var(--bg-white);
}

.btn-green:hover {
    background: var(--accent-teal);
    color: var(--bg-white);
}

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

/* ============================================================================
   STATS SECTION
   ============================================================================ */

.stats {
    background: var(--bg-light);
    padding: var(--spacing-2xl) var(--container-padding);
    border-bottom: 1px solid var(--border-color);
}

.stats-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--secondary-blue);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    font-weight: 500;
}

/* ============================================================================
   CARDS
   ============================================================================ */

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

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

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

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-light);
}

/* Navigation Cards */
.nav-cards {
    padding: var(--spacing-4xl) var(--container-padding);
    background: var(--bg-white);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.nav-card {
    background: var(--bg-light);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-dark);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    text-align: center;
}

.nav-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-blue);
    color: var(--text-dark);
}

.nav-card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.nav-card h3 {
    color: var(--primary-blue);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.nav-card p {
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 0;
}

/* Technique Cards */
.technique-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.technique-card {
    background: var(--bg-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-top: 4px solid var(--secondary-blue);
}

.technique-card h3 {
    color: var(--primary-blue);
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

.technique-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.technique-card li {
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-dark);
}

.technique-card li::before {
    content: "✔";
    position: absolute;
    left: 0;
    color: var(--accent-teal);
    font-weight: 700;
}

/* ============================================================================
   ABOUT SECTION
   ============================================================================ */

.about-section {
    padding: var(--spacing-4xl) var(--container-padding);
    background: var(--bg-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.profile-card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    position: sticky;
    top: 100px;
}

.profile-image-container {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-full);
    border: 4px solid var(--secondary-blue);
    overflow: hidden;
    background: var(--bg-white);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 15%;
}

.profile-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.profile-title {
    font-size: var(--font-size-base);
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.profile-credentials {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.profile-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.profile-link {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-white);
    color: var(--secondary-blue);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.profile-link:hover {
    background: var(--secondary-blue);
    color: var(--bg-white);
    transform: translateX(4px);
}

.bio-content h3 {
    font-size: var(--font-size-3xl);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.bio-content p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    color: var(--text-dark);
}

.awards-list {
    background: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent-teal);
}

.awards-list h4 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.awards-list ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.awards-list li {
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-dark);
}

.awards-list li::before {
    content: "🏆";
    position: absolute;
    left: 0;
}

/* ============================================================================
   TECHNIQUE OVERVIEW SECTION
   ============================================================================ */

.technique-overview {
    padding: var(--spacing-4xl) var(--container-padding);
    background: var(--bg-light);
}

/* ============================================================================
   FOOTER
   ============================================================================ */

.main-footer {
    background: var(--primary-blue);
    color: var(--bg-white);
    padding: var(--spacing-2xl) var(--container-padding);
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.footer-section h4,
.footer-heading {
    margin-bottom: var(--spacing-md);
    font-size: 1.35rem;
    font-weight: 700;
    color: #fbbf24;
}

.footer-section h4 .zip-highlight {
    color: #34d399;
}

.footer-section p {
    opacity: 0.9;
    line-height: 1.8;
    color: var(--bg-white);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--bg-white);
    text-decoration: none;
    opacity: 0.9;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--bg-white);
}

.footer-bottom {
    max-width: var(--container-max-width);
    margin: var(--spacing-xl) auto 0;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-bottom-content {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 2rem;
}

.footer-copyright {
    opacity: 0.9;
}

.footer-copyright p {
    margin: 0 0 var(--spacing-xs) 0;
}

.footer-bottom a {
    color: var(--bg-white);
}

.footer-logo-link {
    flex-shrink: 0;
    order: -1;
}

.footer-logo {
    max-width: 80px;
    width: 80px;
    height: auto;
    background: var(--bg-white);
    padding: 6px 8px;
    border-radius: var(--radius-sm);
}

.footer-legal {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* ============================================================================
   FLASH MESSAGES
   ============================================================================ */

.flash-messages {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.flash-message {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    color: var(--bg-white);
    font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
}

.flash-success { background: var(--success); }
.flash-error { background: var(--error); }
.flash-warning { background: var(--warning); }
.flash-info { background: var(--info); }

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================================================
   MAINTENANCE BANNER
   ============================================================================ */

.maintenance-banner {
    background: var(--warning);
    color: var(--text-dark);
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
}

/* ============================================================================
   FORMS
   ============================================================================ */

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-dark);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-error {
    color: var(--error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* ============================================================================
   UTILITIES
   ============================================================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-xl); }
.mt-3 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-xl); }
.mb-3 { margin-bottom: var(--spacing-2xl); }

.hidden { display: none !important; }
.visible { display: block !important; }

/* ============================================================================
   PAGE HEADER SECTION (Shared across pages)
   ============================================================================ */

.page-header-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    padding: var(--spacing-3xl) var(--container-padding);
    text-align: center;
}

.page-header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.page-header-section h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    color: white;
}

.page-header-section p {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin: 0;
}

.page-header-section .zip-highlight {
    color: var(--highlight-amber);
    font-weight: 700;
}

/* ============================================================================
   RESPONSIVE DESIGN
   ============================================================================ */

@media (max-width: 968px) {
    :root {
        --container-padding: 1.5rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-content h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero-image-container {
        order: -1;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .profile-card {
        position: static;
    }
    
    .technique-grid {
        grid-template-columns: 1fr;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .footer-logo-link {
        order: -1;
    }
    
    .footer-copyright {
        text-align: center;
    }
    
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-nav {
        display: block;
    }
}

@media (max-width: 576px) {
    :root {
        --container-padding: 1rem;
    }
    
    .hero {
        padding: var(--spacing-xl) var(--container-padding);
    }
    
    .hero-content h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .stat-item {
        padding: var(--spacing-md);
    }
    
    .stat-number {
        font-size: var(--font-size-3xl);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .profile-image-container {
        width: 150px;
        height: 150px;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        text-align: center;
        width: 100%;
    }
    
    .nav-container {
        padding: var(--spacing-md);
    }
    
    .mobile-nav {
        width: 280px;
        right: -280px;
    }
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
    .main-nav,
    .mobile-menu-btn,
    .mobile-nav,
    .mobile-menu-overlay,
    .main-footer {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        color: #000;
        background: #fff;
    }
    
    .hero {
        background: #fff !important;
        color: #000 !important;
        -webkit-print-color-adjust: exact;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 10pt;
    }
}
/* ============================================================================
   NEWS PAGE STYLES
   ============================================================================ */

.news-section {
    padding: var(--spacing-4xl) var(--container-padding);
    background: var(--bg-light);
}

.news-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.news-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.news-card.featured {
    border: 2px solid var(--highlight-color);
    box-shadow: var(--shadow-md);
}

.news-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.news-card:hover .news-image img {
    transform: scale(1.05);
}

.news-image-placeholder {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-image-placeholder span {
    color: white;
    font-size: var(--font-size-xl);
    font-weight: 700;
    opacity: 0.5;
}

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

.news-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.news-category {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    border-radius: var(--radius-full);
    background: var(--bg-light);
    color: var(--text-light);
}

.category-news { background: #dbeafe; color: #1e40af; }
.category-update { background: #d1fae5; color: #065f46; }
.category-publication { background: #fef3c7; color: #92400e; }
.category-course { background: #ede9fe; color: #5b21b6; }
.category-award { background: #fce7f3; color: #9d174d; }
.category-other { background: #f3f4f6; color: #374151; }

.news-date {
    font-size: var(--font-size-xs);
    color: var(--text-light);
}

.news-featured-badge {
    background: var(--highlight-color);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
}

.news-title {
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.news-excerpt {
    font-size: var(--font-size-sm);
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.news-read-more {
    background: none;
    border: none;
    color: var(--secondary-blue);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    padding: 0;
    text-align: left;
    transition: color var(--transition-fast);
}

.news-read-more:hover {
    color: var(--primary-blue);
}

/* Modal Styles */
.news-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    padding: var(--spacing-xl);
    overflow-y: auto;
    align-items: flex-start;
    justify-content: center;
}

.news-modal-overlay.active {
    display: flex;
}

.news-modal {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    margin: var(--spacing-xl) auto;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.news-modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-white);
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    box-shadow: var(--shadow-md);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.news-modal-close:hover {
    background: var(--text-dark);
    color: white;
}

.news-modal-image {
    width: 100%;
    max-height: 400px;
    overflow: hidden;
}

.news-modal-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-modal-content {
    padding: var(--spacing-2xl);
}

.news-modal-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.news-modal-title {
    font-size: var(--font-size-3xl);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

.news-modal-body {
    font-size: var(--font-size-base);
    color: var(--text-dark);
    line-height: 1.8;
}

.news-modal-body p {
    margin-bottom: var(--spacing-md);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-4xl) var(--spacing-xl);
    color: var(--text-light);
}

/* Responsive */
@media (max-width: 968px) {
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-modal {
        margin: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .news-modal-content {
        padding: var(--spacing-lg);
    }
    
    .news-modal-title {
        font-size: var(--font-size-2xl);
    }
}

/* ============================================================================
   PUBLICATIONS PAGE STYLES
   ============================================================================ */

.publications-section {
    padding: var(--spacing-4xl) var(--container-padding);
    background: var(--bg-light);
}

.publications-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* Filter Buttons */
.publications-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
    justify-content: center;
}

.filter-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-white);
    color: var(--text-dark);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover {
    border-color: var(--secondary-blue);
    color: var(--secondary-blue);
}

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

.publications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.publication-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    display: flex;
    flex-direction: column;
    position: relative;
}

.publication-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.publication-card.featured {
    border: 2px solid var(--highlight-color);
}

.publication-year-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-blue);
    color: white;
    font-size: var(--font-size-lg);
    font-weight: 700;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
}

.publication-content {
    padding: var(--spacing-lg);
    padding-top: var(--spacing-xl);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.publication-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    padding-right: 70px;
}

.publication-citation {
    font-size: var(--font-size-sm);
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 0;
    margin-top: auto;
}

.publication-citation strong {
    font-weight: 600;
}

.publication-citation em {
    font-style: italic;
}

.publication-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-light);
}

.pub-link {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
}

.abstract-link {
    background: #d1fae5;
    color: #065f46;
    border: 2px solid #059669;
}

.abstract-link:hover {
    background: #a7f3d0;
    color: #047857;
}

.doi-link {
    background: #fef3c7;
    color: #92400e;
    border: 2px solid #d97706;
}

.doi-link:hover {
    background: #fde68a;
    color: #78350f;
}

.pubmed-link {
    background: #dbeafe;
    color: #1e40af;
    border: 2px solid #3b82f6;
}

.pubmed-link:hover {
    background: #bfdbfe;
    color: #1e3a8a;
}

.pdf-link {
    background: #fee2e2;
    color: #991b1b;
    border: 2px solid #dc2626;
}

.pdf-link:hover {
    background: #fecaca;
    color: #7f1d1d;
}

/* No Results Message */
.no-results {
    text-align: center;
    padding: var(--spacing-4xl) var(--spacing-xl);
    color: var(--text-light);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
}

/* Publications Modal */
.pub-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    padding: var(--spacing-xl);
    overflow-y: auto;
    align-items: flex-start;
    justify-content: center;
}

.pub-modal-overlay.active {
    display: flex;
}

.pub-modal {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    max-width: 800px;
    width: 100%;
    margin: var(--spacing-xl) auto;
    position: relative;
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

.pub-modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-white);
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-light);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    box-shadow: var(--shadow-md);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.pub-modal-close:hover {
    background: var(--text-dark);
    color: white;
}

.pub-modal-content {
    padding: var(--spacing-2xl);
}

.pub-modal-title {
    font-size: var(--font-size-2xl);
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    line-height: 1.4;
    padding-right: var(--spacing-2xl);
}

.pub-modal-authors {
    font-size: var(--font-size-base);
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.pub-modal-journal {
    font-size: var(--font-size-sm);
    color: var(--secondary-blue);
    font-style: italic;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.pub-modal-abstract h4 {
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.pub-modal-abstract p {
    font-size: var(--font-size-base);
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.pub-modal-links {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.pub-modal-links .pub-link {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* Publications Responsive */
@media (max-width: 968px) {
    .publications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .publications-filters {
        justify-content: flex-start;
    }
}

@media (max-width: 576px) {
    .publications-grid {
        grid-template-columns: 1fr;
    }
    
    .publication-title {
        padding-right: 0;
        padding-top: var(--spacing-xl);
    }
    
    .publication-year-badge {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .publications-filters {
        justify-content: center;
    }
    
    .filter-btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
    
    .pub-modal {
        margin: var(--spacing-md);
        border-radius: var(--radius-md);
    }
    
    .pub-modal-content {
        padding: var(--spacing-lg);
    }
    
    .pub-modal-title {
        font-size: var(--font-size-xl);
    }
}