/* Custom CSS for Rafael Delwart Portfolio Website */

/* ===== MODERN DESIGN VARIABLES ===== */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --background-light: #ecf0f1;
    --background-dark: #34495e;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 30px rgba(0,0,0,0.2);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== BASIC TAB FUNCTIONALITY ===== */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-content.active {
    display: block;
}

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

/* ===== NAVIGATION IMPROVEMENTS ===== */
#nav {
    padding: 20px 0;
    margin: 0 auto;
    max-width: 1200px;
}

#nav ul {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.95) 100%);
    backdrop-filter: blur(15px);
    border-radius: 35px;
    padding: 20px 40px;
    box-shadow: var(--shadow-heavy);
    border: 2px solid rgba(52, 152, 219, 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    position: relative;
    overflow: hidden;
}

#nav ul::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.05), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

#nav ul li {
    margin: 0 8px;
    list-style: none;
}

#nav ul li a {
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    padding: 18px 35px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 1.1em;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 120px;
    justify-content: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 1;
}

#nav ul li a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.1), transparent);
    transition: var(--transition);
    z-index: -1;
}

#nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
    transition: transform 0.3s ease;
}

#nav ul li a:hover {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

#nav ul li a:hover::before {
    left: 100%;
}

#nav ul li a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

#nav ul li a.active {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

#nav ul li a.active::after {
    transform: translateX(-50%) scaleX(1);
    background: white;
}

/* Add icons to navigation items */
#nav ul li a[onclick*="home"]::before {
    content: '🏠';
    margin-right: 8px;
}

#nav ul li a[onclick*="cv"]::before {
    content: '📄';
    margin-right: 8px;
}

#nav ul li a[onclick*="projects"]::before {
    content: '💼';
    margin-right: 8px;
}

/* ===== ENHANCED HEADER STYLING ===== */
#header {
    background: linear-gradient(135deg, rgba(255,255,255,0.95) 0%, rgba(248,249,250,0.95) 100%);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(52, 152, 219, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* ===== CONTACT SECTION STYLING ===== */
#contact {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    max-width: 900px;
    margin: 30px auto;
    position: relative;
    overflow: hidden;
}

#contact::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-20px, -20px) rotate(180deg); }
}

#contact h2 {
    font-size: 2.2em;
    margin-bottom: 30px;
    color: var(--primary-color);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

#contact h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
}

.contact-info {
    list-style: none;
    padding-left: 0;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

.contact-info li {
    margin-bottom: 20px;
    font-size: 1.1em;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    margin: 10px 20px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.contact-info li:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-light);
    background: rgba(255, 255, 255, 0.95);
}

.contact-info li i {
    margin-right: 15px;
    color: var(--secondary-color);
    font-size: 1.5em;
    width: 30px;
    text-align: center;
}

.contact-info li a {
    text-decoration: none;
    color: var(--secondary-color);
    transition: var(--transition);
}

.contact-info li a:hover {
    color: var(--accent-color);
    text-decoration: none;
}

/* Email wrapper improvements */
.email-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.email {
    font-size: 0.9em;
    padding: 5px 10px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 15px;
    transition: var(--transition);
}

.email:hover {
    background: rgba(52, 152, 219, 0.2);
    transform: scale(1.05);
}

.separator {
    margin: 0 8px;
    color: var(--text-light);
    font-weight: bold;
}

/* ===== BUTTON IMPROVEMENTS ===== */
.button.alt {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 25px;
    transition: var(--transition);
    font-weight: 600;
    box-shadow: var(--shadow-light);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.button.alt::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #3498db, var(--accent-color));
    transition: var(--transition);
    z-index: -1;
}

.button.alt:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.button.alt:hover::before {
    left: 0;
}

/* ===== PROJECT GRID STYLING ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.project-card {
    border: none;
    padding: 25px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    background: white;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.project-card img {
    max-width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    transition: var(--transition);
}

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

.project-card h3 a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
}

.project-card p {
    margin: 15px 0;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.button {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: #fff;
    text-decoration: none;
    border-radius: 20px;
    transition: var(--transition);
    font-weight: 500;
    box-shadow: var(--shadow-light);
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: linear-gradient(135deg, #2980b9, var(--accent-color));
}

/* ===== PROJECT DETAIL IMAGES ===== */
.responsive-img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 30px auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
}

.responsive-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-heavy);
}

.responsive-img-smaller {
    max-width: 80%;
    height: auto;
    display: block;
    margin: 30px auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
}

.responsive-img-smaller:hover {
    transform: scale(1.03);
}

/* ===== VIDEO CONTAINER ===== */
.video-container-autonmous-bot {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 40px 0;
}

.video-container-autonmous-bot video {
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    max-width: 100%;
    height: auto;
}

/* ===== LAB REPORT STYLING ===== */
.lab-report-container {
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
}

.lab-report-box {
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    text-align: center;
    margin-bottom: 30px;
    transition: var(--transition);
}

.lab-report-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.lab-report-thumbnail {
    max-width: 100%;
    height: auto;
    margin-bottom: 25px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.lab-report-thumbnail:hover {
    transform: scale(1.05) rotateZ(1deg);
    box-shadow: var(--shadow-heavy);
}

.lab-report-button.alt {
    display: inline-block;
    padding: 12px 25px;
    background: linear-gradient(135deg, var(--success-color), #229954);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    transition: var(--transition);
    margin-top: 20px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    box-shadow: var(--shadow-light);
}

.lab-report-button.alt:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: linear-gradient(135deg, #229954, var(--success-color));
}

/* ===== GIF STYLING ===== */
.gif-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 30px auto;
    border: 3px solid var(--secondary-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    transition: var(--transition);
}

.gif-image:hover {
    transform: scale(1.02);
    border-color: var(--accent-color);
}

/* ===== COURSE LIST STYLING ===== */
.course-list {
    list-style: none;
    padding-left: 0;
}

.course-list li {
    margin: 15px 0;
    padding: 15px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.course-list li:hover {
    transform: translateX(10px);
    border-left-color: var(--accent-color);
    box-shadow: var(--shadow-medium);
}

.course-list li a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 600;
    transition: var(--transition);
}

.course-list li a:hover {
    color: var(--accent-color);
}

/* ===== BOX STYLING ===== */
.box h3 {
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 600;
}

.box h3 i {
    margin-right: 15px;
    color: var(--secondary-color);
    font-size: 1.3em;
}

.icon {
    font-size: 1.2em;
}

.box {
    padding: 30px;
    margin-bottom: 30px;
    border-radius: var(--border-radius);
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    border: 1px solid rgba(52, 152, 219, 0.1);
}

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

/* ===== PDF PREVIEW IMPROVEMENTS ===== */
.pdf-preview {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 20px 0;
}

#pdf-canvas, #pdf-fallback {
    border: 2px solid var(--secondary-color) !important;
    border-radius: var(--border-radius) !important;
    box-shadow: var(--shadow-heavy) !important;
}

#pdf-loading {
    background: rgba(52, 152, 219, 0.1);
    border-radius: var(--border-radius);
    margin: 20px;
    color: var(--primary-color) !important;
    font-weight: 500;
}

/* ===== BANNER IMPROVEMENTS ===== */
#banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 60px 40px;
    border-radius: var(--border-radius);
    margin-bottom: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

#banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

#banner h2 {
    font-size: 3em;
    margin-bottom: 15px;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

#banner p {
    font-size: 1.3em;
    position: relative;
    z-index: 1;
    opacity: 0.9;
}

/* ===== RESPONSIVE IMPROVEMENTS ===== */
@media (max-width: 768px) {
    /* Navigation responsive adjustments */
    #nav {
        padding: 15px 10px;
    }
    
    #nav ul {
        padding: 15px 20px;
        border-radius: 25px;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    #nav ul li a {
        padding: 12px 20px;
        font-size: 0.95em;
        min-width: 100px;
    }
    
    .contact-info li {
        margin: 10px 5px;
        padding: 12px;
    }
    
    .email-wrapper {
        flex-direction: column;
        gap: 8px;
    }
    
    #banner h2 {
        font-size: 2.2em;
    }
    
    .box {
        padding: 20px;
    }
    
    .course-list li:hover {
        transform: translateX(5px);
    }
}

@media (max-width: 480px) {
    #nav ul {
        padding: 10px 15px;
        gap: 5px;
    }
    
    #nav ul li a {
        padding: 10px 15px;
        font-size: 0.9em;
        min-width: 80px;
        letter-spacing: 0.3px;
    }
    
    #nav ul li a[onclick*="home"]::before,
    #nav ul li a[onclick*="cv"]::before,
    #nav ul li a[onclick*="projects"]::before {
        margin-right: 4px;
    }
}

/* ===== SCROLL ANIMATIONS ===== */
@keyframes slideInFromBottom {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.box, .project-card, .lab-report-box {
    animation: slideInFromBottom 0.6s ease-out;
}