/* ========================================
   Yulianti Abbas, Ph.D. - Academic Website
   Main Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --color-navy: #002147;
    --color-navy-dark: #001530;
    --color-white: #ffffff;
    --color-gray-light: #f8f9fa;
    --color-gray: #6c757d;
    --color-gray-dark: #343a40;
    --color-gold: #c9a227;
    --color-gold-light: #d4b94a;
    --color-text: #212529;
    --color-text-light: #495057;
    
    --font-serif: 'Merriweather', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    line-height: 1.7;
    background-color: var(--color-white);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-navy);
}

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

p {
    margin-bottom: 1rem;
    color: var(--color-text-light);
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

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

.nav-brand a {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-navy);
}

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

.nav-link {
    font-weight: 500;
    color: var(--color-text-light);
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transition: width var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-navy);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-navy);
    transition: all var(--transition-normal);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-dark) 100%);
    color: var(--color-white);
    padding-top: 80px;
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-text {
    animation: fadeInUp 0.8s ease;
}

.hero-name {
    font-size: 3rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.hero-title {
    font-size: 1.5rem;
    color: var(--color-gold);
    font-weight: 400;
    margin-bottom: var(--spacing-xs);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-light);
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
}

.hero-tagline {
    font-size: 1.1rem;
    color: var(--color-gray-light);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 0.8s ease;
}

.profile-placeholder {
    width: 350px;
    height: 350px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--color-gold);
    overflow: hidden;
}

.profile-placeholder svg {
    width: 80%;
    height: 80%;
}

.hero-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
}

.hero-wave svg {
    width: 100%;
    height: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--color-gold);
    color: var(--color-navy);
}

.btn-primary:hover {
    background: var(--color-gold-light);
    color: var(--color-navy-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-navy);
    border-color: var(--color-navy);
}

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

/* Sections */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background: var(--color-gray-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--color-gold);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.about-heading {
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    color: var(--color-navy);
}

.about-heading:first-child {
    margin-top: 0;
}

.about-bio {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

.academic-list,
.honors-list {
    list-style: none;
    margin: var(--spacing-sm) 0;
}

.academic-list li,
.honors-list li {
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.academic-list li::before,
.honors-list li::before {
    content: '•';
    color: var(--color-gold);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: 0;
}

.academic-item {
    font-weight: 500;
}

.academic-item strong {
    color: var(--color-navy);
}

/* Research Section */
.research-content {
    display: grid;
    gap: var(--spacing-lg);
}

.research-interests,
.research-publications {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.research-interests h3,
.research-publications h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.interests-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.interests-list li {
    padding: var(--spacing-sm);
    background: var(--color-gray-light);
    border-radius: var(--border-radius);
    font-weight: 500;
    color: var(--color-navy);
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.publication-item {
    padding: var(--spacing-md);
    background: var(--color-gray-light);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-gold);
}

.publication-title {
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
}

.publication-meta {
    font-size: 0.9rem;
    color: var(--color-gray);
}

.publication-meta strong {
    color: var(--color-navy);
}

.publications-more {
    text-align: center;
    margin-top: var(--spacing-md);
}

/* Teaching Section */
.teaching-content {
    display: grid;
    gap: var(--spacing-lg);
}

.teaching-philosophy,
.teaching-courses {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.teaching-philosophy h3,
.teaching-courses h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.philosophy-text {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-light);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.course-card {
    padding: var(--spacing-md);
    background: var(--color-gray-light);
    border-radius: var(--border-radius);
    border-top: 4px solid var(--color-navy);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.course-code {
    font-size: 0.85rem;
    color: var(--color-gold);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.course-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
}

.course-level {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-navy);
    color: var(--color-white);
    font-size: 0.8rem;
    border-radius: 20px;
    margin-bottom: var(--spacing-xs);
}

.course-description {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.news-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.news-date {
    font-size: 0.85rem;
    color: var(--color-gold);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.news-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: var(--spacing-xs);
}

.news-source {
    font-size: 0.9rem;
    color: var(--color-gray);
    font-style: italic;
    margin-bottom: var(--spacing-sm);
}

.news-summary {
    font-size: 0.95rem;
    color: var(--color-text-light);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
}

.contact-info,
.contact-social {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-item {
    margin-bottom: var(--spacing-md);
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-navy);
}

.contact-item p {
    color: var(--color-text-light);
    margin: 0;
}

.contact-social h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-navy);
}

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

.social-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--color-gray-light);
    border-radius: var(--border-radius);
    transition: background var(--transition-fast);
}

.social-link:hover {
    background: var(--color-navy);
}

.social-link:hover a {
    color: var(--color-white);
}

.social-link a {
    color: var(--color-navy);
    font-weight: 500;
}

/* Footer */
.footer {
    background: var(--color-navy);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    color: var(--color-gray-light);
    margin: var(--spacing-xs) 0;
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .profile-placeholder {
        width: 280px;
        height: 280px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    
    z-index: 1001;}
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    z-index: 1000;
max-height: 80vh;
overflow-y: auto;
}
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
.nav-menu a {
color: var(--color-primary);
padding: 10px 0;
font-size: 1.1rem;
text-decoration: none;
}
.nav-menu a:hover {
color: var(--color-accent);
}

    
    .hero-name {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .profile-placeholder {
        width: 240px;
        height: 240px;
    }
    
    .interests-list {
        grid-template-columns: 1fr;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-name {
        font-size: 1.75rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .hero-actions,
    .footer {
        display: none;
    }
    
    .section {
        padding: var(--spacing-md) 0;
    }
    
    body {
        font-size: 12pt;
    }
}