/* ===== VARIABLES Y RESET ===== */
:root {
    --color-primary: #2c3e50;
    --color-secondary: #1a252f;
    --color-accent: #e67e22;
    --color-accent-light: #f39c12;
    --color-success: #27ae60;
    --color-info: #3498db;
    --color-warning: #f39c12;

    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #1a252f;
    --bg-card: #ffffff;

    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #95a5a6;
    --text-inverse: #ffffff;

    --font-heading: 'Crimson Text', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.2);

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

/* ===== DARK MODE VARIABLES ===== */
[data-theme="dark"] {
    --color-primary: #e0e6ed;
    --color-secondary: #cbd5e0;

    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-dark: #0f1419;
    --bg-card: #2d3748;

    --text-primary: #e0e6ed;
    --text-secondary: #a0aec0;
    --text-light: #718096;
    --text-inverse: #1a202c;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.5);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.6);
}

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

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

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--bg-primary);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }

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

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

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

.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background: var(--bg-secondary);
}

/* ===== HEADER ===== */
.header {
    background: var(--bg-dark);
    color: var(--text-inverse);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

.header-content {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.header-title {
    font-size: 2rem;
    color: #ffffff;
    margin-bottom: var(--spacing-xs);
}

.header-subtitle {
    font-size: 1rem;
    color: rgba(255,255,255,0.95);
    font-weight: 400;
    margin-bottom: 0.25rem;
}

.header-institution {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.8);
    font-weight: 300;
}

.nav-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.nav-link {
    color: rgba(255,255,255,0.8);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: #ffffff;
    background: rgba(255,255,255,0.2);
}

/* Theme Toggle */
.theme-toggle {
    background: rgba(255,255,255,0.1);
    border: 2px solid rgba(255,255,255,0.2);
    color: var(--text-inverse);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.2);
    transform: rotate(20deg) scale(1.1);
}

.theme-toggle:active {
    transform: rotate(20deg) scale(0.95);
}

/* ===== HERO ===== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-inverse);
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::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="40" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-inverse);
    text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.hero-description {
    font-size: 1.3rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    color: rgba(255,255,255,0.95);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-inverse);
}

.stat-label {
    font-size: 1rem;
    color: rgba(255,255,255,0.9);
    margin-top: 0.25rem;
}

/* ===== HERO MINIMAL (HOME PAGE) ===== */
.hero-minimal {
    padding: calc(var(--spacing-xl) * 1.5) 0;
}

.hero-title-large {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-inverse);
    text-shadow: 0 4px 30px rgba(0,0,0,0.3);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}

/* ===== ANNOUNCEMENT SECTION ===== */
.announcement-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

.announcement-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    transition: var(--transition);
    border: 3px solid transparent;
    background-image: linear-gradient(var(--bg-card), var(--bg-card)),
                      linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

.announcement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.announcement-icon {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.announcement-icon i {
    font-size: 3rem;
    color: white;
}

.announcement-content {
    flex: 1;
}

.announcement-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.announcement-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.btn-announcement {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-announcement:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

/* ===== SECTION HEADERS ===== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: var(--spacing-md) auto 0;
    line-height: 1.7;
}

/* ===== INNOVATION SECTION ===== */
.section-innovation {
    background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
}

.innovation-section {
    margin-bottom: var(--spacing-xl);
}

.category-title {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-title i {
    color: var(--color-accent);
}

.category-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* Moodle Highlight */
.moodle-highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    color: white;
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
}

.moodle-content h4 {
    font-size: 2rem;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.moodle-content p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    color: rgba(255,255,255,0.95);
}

.moodle-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.moodle-features span {
    background: rgba(255,255,255,0.2);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    backdrop-filter: blur(10px);
}

/* Chatbots Grid */
.chatbots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.chatbot-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.chatbot-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.chatbot-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
    color: white;
}

.chatbot-title {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.chatbot-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.feature-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: white;
    font-size: 1.3rem;
}

.feature-card h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Methodology Grid */
.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.methodology-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-accent);
}

.methodology-card h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.methodology-card h4 i {
    color: var(--color-accent);
    margin-right: 0.5rem;
}

.methodology-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.methodology-card a {
    color: var(--color-accent);
    font-weight: 600;
}

/* ===== PROJECTS ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Imágenes de proyectos - Proyecto destacado */
.project-image-container {
    position: relative;
    width: 100%;
    height: 300px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.project-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-image-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-size: 3rem;
}

.project-image-placeholder span {
    font-size: 1rem;
    margin-top: var(--spacing-sm);
    opacity: 0.9;
}

.project-image:not([style*="display: none"]) ~ .project-image-placeholder {
    display: none;
}

.project-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-content .card-actions {
    margin-top: auto;
}

/* Thumbnails de proyectos - Tarjetas pequeñas */
.project-thumbnail {
    position: relative;
    width: 100%;
    height: 180px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.project-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.thumbnail-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 3rem;
}

.project-thumbnail img:not([style*="display: none"]) ~ .thumbnail-placeholder {
    display: none;
}

.project-content-small {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-content-small .card-actions {
    margin-top: auto;
    padding-top: var(--spacing-sm);
}

.project-card:hover .project-image,
.project-card:hover .project-thumbnail img {
    transform: scale(1.05);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: var(--transition);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-card.featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.project-badge {
    display: inline-block;
    background: var(--gradient-accent);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.project-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.project-tag,
.tag {
    background: var(--color-accent);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ===== CARD ACTIONS ===== */
.card-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap;
}

.pub-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

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

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

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

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-share,
.btn-share-small {
    background: rgba(0,0,0,0.05);
    color: var(--text-secondary);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.btn-share:hover,
.btn-share-small:hover {
    background: var(--color-accent);
    color: white;
}

/* ===== PUBLICATIONS ===== */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-md);
}

.publication-item.highlighted {
    border: 2px solid var(--color-accent);
    background: linear-gradient(135deg, #fff 0%, #fff9f5 100%);
}

.pub-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.pub-content {
    flex: 1;
}

.pub-content h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pub-meta {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

.pub-meta i {
    color: var(--color-accent);
    margin-right: 0.3rem;
}

.pub-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
}

.pub-badge.published {
    background: var(--color-success);
    color: white;
}

.pub-badge.conference {
    background: var(--color-info);
    color: white;
}

.pub-badge.preparation {
    background: var(--color-warning);
    color: white;
}

/* ===== TIMELINE ===== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 80px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-md);
}

.timeline-icon {
    position: absolute;
    left: -50px;
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
    box-shadow: var(--shadow-md);
    z-index: 1;
}

.timeline-date {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.timeline-content h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.timeline-location {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.timeline-location i {
    color: var(--color-accent);
    margin-right: 0.3rem;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.timeline-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.timeline-actions a {
    color: var(--color-accent);
    font-weight: 600;
}

/* ===== CONTACT ===== */
.section-contact {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.section-contact .section-title {
    color: white;
}

.section-contact .section-title::after {
    background: var(--bg-card);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.contact-role {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: rgba(255,255,255,0.9);
}

.contact-details p {
    margin-bottom: 0.5rem;
    color: rgba(255,255,255,0.9);
}

.contact-details i {
    margin-right: 0.5rem;
    color: rgba(255,255,255,0.7);
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    color: var(--color-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    margin-top: var(--spacing-md);
    transition: var(--transition);
}

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-social h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

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

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    color: white;
}

.social-btn.twitter {
    background: #1DA1F2;
}

.social-btn.linkedin {
    background: #0077B5;
}

.social-btn.facebook {
    background: #1877F2;
}

.social-btn.copy {
    background: rgba(255,255,255,0.2);
}

.social-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.8);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer-sub {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.6);
}

/* ===== MODAL ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--bg-card);
    margin: 10% auto;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    position: relative;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-content h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.share-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    color: white;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

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

    .hero-title-large {
        font-size: 3rem;
    }

    .hero-stats {
        gap: var(--spacing-md);
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .section-title {
        font-size: 2rem;
    }

    .project-card.featured {
        grid-column: auto;
    }

    .timeline {
        padding-left: 40px;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-icon {
        left: -30px;
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .nav {
        flex-direction: column;
        gap: 0.5rem;
    }

    .chatbots-grid,
    .features-grid,
    .methodology-grid {
        grid-template-columns: 1fr;
    }

    .announcement-card {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-md);
    }

    .announcement-icon {
        width: 80px;
        height: 80px;
    }

    .announcement-icon i {
        font-size: 2.5rem;
    }

    .announcement-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-title-large {
        font-size: 2.5rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }

    .announcement-title {
        font-size: 1.25rem;
    }
}

/* ===== DARK MODE SPECIFIC STYLES ===== */
[data-theme="dark"] .modal {
    background: rgba(0,0,0,0.85);
}

[data-theme="dark"] .section-innovation {
    background: linear-gradient(to bottom, #2d3748 0%, #1a202c 100%);
}

[data-theme="dark"] .project-card.featured {
    background: linear-gradient(135deg, #2d3748 0%, #374151 100%);
}

[data-theme="dark"] .publication-item.highlighted {
    background: linear-gradient(135deg, #2d3748 0%, #374151 100%);
    border-color: var(--color-accent);
}

/* ===== ACCESSIBILITY - REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .theme-toggle:hover {
        transform: none;
    }

    .project-card:hover .project-image,
    .project-card:hover .project-thumbnail img {
        transform: none;
    }
}