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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-alt: #1e293b;
    --light: #f1f5f9;
    --text: #334155;
    --text-light: #64748b;
    --success: #10b981;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--light);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Particle Background */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.03;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-alt) 100%);
    color: white;
    padding: 4rem 2rem 2rem;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: moveBackground 20s linear infinite;
}

@keyframes moveBackground {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 1;
}

.profile-photo-wrapper {
    position: relative;
    margin-bottom: 2rem;
}

.profile-photo {
    width: 200px;
    height: 200px;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    animation: float 3s ease-in-out infinite;
    position: relative;
    z-index: 2;
}

.photo-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 220px;
    height: 220px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    opacity: 0.5;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

@keyframes pulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.3; }
}

.typing-effect {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    max-width: 700px;
    text-align: center;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.5s;
}

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

/* Navigation */
nav {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.8s;
}

.tab-button {
    padding: 0.9rem 2.2rem;
    color: white;
    background: rgba(255, 255, 255, 0.08);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    font-size: 0.9rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tab-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.tab-button:hover::before {
    left: 100%;
}

.tab-button:hover {
    background: white;
    color: var(--dark);
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.tab-button.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: var(--primary);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

/* Progress Bar */
.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 1000;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    width: 0%;
    transition: width 0.3s ease;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto 3rem;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
    padding-top: 3rem;
}

.tab-content {
    display: none;
    background: white;
    border-radius: 24px;
    padding: 3.5rem;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.12);
    position: relative;
    overflow: hidden;
    margin-top: 0;
}

.tab-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
}

.tab-content.active {
    display: block;
    animation: slideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.section-title {
    font-size: 2.8rem;
    color: var(--dark);
    margin-bottom: 2rem;
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    animation: expandWidth 0.8s ease forwards;
}

@keyframes expandWidth {
    from { width: 0; }
    to { width: 100%; }
}

.section-subtitle {
    font-size: 1.8rem;
    color: var(--dark);
    margin: 2.5rem 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.section-subtitle::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.intro-text {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--text);
    margin-bottom: 1.5rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin: 2.5rem 0;
}

.card {
    background: linear-gradient(135deg, #fff 0%, var(--light) 100%);
    padding: 2rem;
    border-radius: 20px;
    border: 2px solid transparent;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 0;
}

.card:hover::before {
    opacity: 0.05;
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary);
    box-shadow: 0 20px 50px rgba(99, 102, 241, 0.2);
}

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

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: inline-block;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.card h4 {
    font-size: 1.4rem;
    color: var(--dark);
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.card p {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 1.7;
    margin: 0;
}

/* Achievement List */
.achievement-list {
    list-style: none;
    padding: 0;
}

.achievement-item {
    background: var(--light);
    padding: 1.8rem;
    margin-bottom: 1.5rem;
    border-radius: 16px;
    border-left: 5px solid var(--primary);
    transition: all 0.4s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.achievement-item::before {
    content: '🏆';
    position: absolute;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2rem;
    opacity: 0.2;
    transition: all 0.4s ease;
}

.achievement-item:hover {
    background: white;
    transform: translateX(15px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-left-width: 8px;
}

.achievement-item:hover::before {
    opacity: 0.5;
    transform: translateY(-50%) rotate(360deg);
}

.achievement-item strong {
    color: var(--primary);
    font-size: 1.2rem;
    display: block;
    margin-bottom: 0.5rem;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.2rem;
    margin: 2.5rem 0;
}

.skill-badge {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 1.3rem;
    border-radius: 12px;
    text-align: center;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.4s ease;
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.skill-badge::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.skill-badge:hover::before {
    width: 300px;
    height: 300px;
}

.skill-badge:hover {
    transform: scale(1.08);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.5);
}

.skill-badge span {
    position: relative;
    z-index: 1;
}

/* Activity List */
.activity-list {
    list-style: none;
    padding: 0;
}

.activity-item {
    background: white;
    border: 2px solid var(--light);
    padding: 1.8rem;
    margin-bottom: 1.5rem;
    border-radius: 16px;
    transition: all 0.4s ease;
    cursor: pointer;
    position: relative;
}

.activity-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 5px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
    border-radius: 16px 0 0 16px;
    transform: scaleY(0);
    transition: transform 0.4s ease;
}

.activity-item:hover::before {
    transform: scaleY(1);
}

.activity-item:hover {
    border-color: var(--primary);
    transform: translateX(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.activity-item strong {
    color: var(--primary);
    font-size: 1.2rem;
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.activity-item p {
    color: var(--text-light);
    margin: 0;
    line-height: 1.7;
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    text-align: center;
    padding: 2.5rem;
    margin-top: 5rem;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    animation: scan 3s linear infinite;
}

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

footer p {
    margin: 0;
    opacity: 0.9;
    font-size: 1rem;
}

/* Scroll to Top Button */
#scrollTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.4);
    z-index: 999;
}

#scrollTop.visible {
    opacity: 1;
    visibility: visible;
}

#scrollTop:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

/* Responsive */
@media (max-width: 768px) {
    .typing-effect {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .tab-content {
        padding: 2rem 1.5rem;
        margin-top: 0;
    }

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

    .card-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    nav {
        flex-direction: column;
        gap: 0.8rem;
        padding: 0 1rem;
    }

    .tab-button {
        width: 100%;
    }

    .profile-photo {
        width: 150px;
        height: 150px;
    }

    .photo-ring {
        width: 170px;
        height: 170px;
    }
}