/* ==========================================================================
   Jam Sadiq Professional Website - Stylesheet
   ========================================================================== */

/* ==========================================================================
   1. CSS Reset & Base Styles
   ========================================================================== */

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

:root {
    /* Color Palette */
    --primary-color: #4b0082;        /* Indigo */
    --primary-dark: #2d004e;         /* Dark Indigo */
    --primary-light: #6a0dad;        /* Purple */
    --accent-color: #8b00ff;         /* Bright Purple */
    --text-dark: #1a1a1a;            /* Almost Black */
    --text-medium: #4a4a4a;          /* Dark Gray */
    --text-light: #666666;           /* Medium Gray */
    --background-light: #f8f9fa;     /* Light Gray */
    --background-white: #ffffff;     /* White */
    --border-color: #e0e0e0;         /* Light Border */
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Playfair Display', Georgia, 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-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--background-light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   2. Typography
   ========================================================================== */

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

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

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

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

strong {
    font-weight: 600;
    color: var(--text-dark);
}

/* ==========================================================================
   3. Header Section
   ========================================================================== */

.site-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    padding: var(--spacing-xxl) var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.header-text {
    flex: 1;
}

.site-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.site-subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    margin-bottom: var(--spacing-xs);
    color: rgba(255, 255, 255, 0.95);
}

.institution {
    font-size: 1.1rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0;
}

.header-image {
    flex-shrink: 0;
}

.header-image img {
    width: 200px;
    height: 200px;
    border-radius: var(--radius-full);
    border: 4px solid rgba(255, 255, 255, 0.2);
    object-fit: cover;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-normal);
}

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

/* ==========================================================================
   4. Navigation
   ========================================================================== */

.main-nav {
    background-color: var(--primary-light);
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    padding: 0 var(--spacing-md);
}

.nav-link {
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background-color: white;
    transform: translateX(-50%);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* ==========================================================================
   5. Main Content & Container
   ========================================================================== */

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

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ==========================================================================
   6. Sections
   ========================================================================== */

section {
    margin-bottom: var(--spacing-xxl);
}

.section-title {
    font-size: 2.2rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--accent-color);
}

/* ==========================================================================
   7. About Section
   ========================================================================== */

.about-section {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.lead-text {
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--primary-dark);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    font-size: 1.05rem;
    line-height: 1.8;
}

/* ==========================================================================
   8. Research Section
   ========================================================================== */

.research-section {
    background-color: transparent;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.research-card {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all var(--transition-normal);
    border-top: 4px solid var(--primary-color);
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(75, 0, 130, 0.2);
}

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

.research-card h3 {
    font-size: 1.3rem;
    color: var(--primary-dark);
    margin-bottom: var(--spacing-md);
    font-family: var(--font-primary);
    font-weight: 600;
}

.research-card p {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0;
}

/* ==========================================================================
   9. Inspiration Section
   ========================================================================== */

.inspiration-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    padding: var(--spacing-xxl);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.inspiration-section::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 10rem;
    color: rgba(255, 255, 255, 0.1);
    font-family: Georgia, serif;
}

.inspiration-quote {
    position: relative;
    z-index: 1;
}

.inspiration-quote p {
    font-size: 1.25rem;
    line-height: 1.8;
    color: white;
    font-style: italic;
    margin: 0;
}

.inspiration-quote a {
    color: white;
    text-decoration: underline;
    font-weight: 500;
}

.inspiration-quote a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* ==========================================================================
   10. Publications Section
   ========================================================================== */

.publications-section {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px var(--shadow-color);
}

.publications-section p {
    font-size: 1.1rem;
    margin: 0;
}

.external-link {
    font-weight: 600;
    color: var(--primary-color);
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast);
}

.external-link:hover {
    border-bottom-color: var(--accent-color);
}

/* ==========================================================================
   11. Professional Links Section
   ========================================================================== */

.links-section {
    background-color: transparent;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.profile-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--background-white);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all var(--transition-normal);
    border-left: 4px solid var(--primary-color);
}

.profile-link:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 20px rgba(75, 0, 130, 0.15);
    border-left-color: var(--accent-color);
}

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

.link-text {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--primary-dark);
}

/* ==========================================================================
   12. Footer
   ========================================================================== */

.site-footer {
    background-color: var(--text-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-xxl) var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-info {
    margin-bottom: var(--spacing-xl);
}

.footer-info h3 {
    color: white;
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    font-family: var(--font-primary);
}

.institution-full {
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-info p {
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

.footer-info a {
    color: rgba(255, 255, 255, 0.9);
    transition: color var(--transition-fast);
}

.footer-info a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.footer-note {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}

/* ==========================================================================
   13. Utility Classes
   ========================================================================== */

.callout {
    color: var(--text-light);
    font-style: italic;
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--primary-color);
}

.bold-red {
    font-weight: bold;
    color: #dc3545;
}

#pageTitle {
    color: var(--primary-color);
    font-weight: bold;
}

/* ==========================================================================
   14. Responsive Design
   ========================================================================== */

@media (max-width: 968px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .site-title {
        font-size: 2.5rem;
    }
    
    .header-image img {
        width: 180px;
        height: 180px;
    }
    
    .nav-container {
        justify-content: center;
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .links-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-xxl: 2.5rem;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .site-header {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .site-title {
        font-size: 2rem;
    }
    
    .site-subtitle {
        font-size: 1.1rem;
    }
    
    .header-image img {
        width: 150px;
        height: 150px;
    }
    
    .main-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .lead-text {
        font-size: 1.15rem;
    }
    
    .inspiration-quote p {
        font-size: 1.1rem;
    }
    
    .nav-link {
        padding: var(--spacing-sm);
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        padding: 0;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .header-image img {
        width: 120px;
        height: 120px;
    }
    
    .research-card,
    .about-section,
    .publications-section {
        padding: var(--spacing-lg);
    }
}

/* ==========================================================================
   15. Print Styles
   ========================================================================== */

@media print {
    .main-nav,
    .site-footer {
        display: none;
    }
    
    body {
        background-color: white;
    }
    
    .site-header {
        background: white;
        color: black;
    }
    
    .section-title {
        color: black;
    }
}