:root {
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --secondary-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    --hero-gradient: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #2563eb 100%);
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-surface-alt: #334155;
    --light-bg: #f8fafc;
    --light-surface: #ffffff;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-primary: 0 25px 50px -12px rgba(37, 99, 235, 0.25);
    --shadow-secondary: 0 10px 25px -5px rgba(59, 130, 246, 0.1);
    --border-radius: 24px;
    --border-radius-sm: 16px;
    --animation-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body.light-mode {
    background: var(--light-bg);
    color: var(--text-dark);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --shadow-primary: 0 25px 50px -12px rgba(37, 99, 235, 0.15);
    --shadow-secondary: 0 10px 25px -5px rgba(59, 130, 246, 0.08);
}

/* Animated Background */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, rgba(37, 99, 235, 0.1), rgba(59, 130, 246, 0.1));
    animation: float 6s ease-in-out infinite;
}

.shape:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape:nth-child(2) {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.shape:nth-child(3) {
    width: 60px;
    height: 60px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

.shape:nth-child(4) {
    width: 100px;
    height: 100px;
    top: 40%;
    right: 30%;
    animation-delay: 1s;
}

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

/* Glass Morphism Hero */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--hero-gradient);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    z-index: 2;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 300;
}

.hero-contact {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
}

.contact-item a {
    color: inherit;
    text-decoration: none;
    transition: color var(--animation-speed);
}

.contact-item a:hover {
    color: #ffffff;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    backdrop-filter: blur(20px);
    transition: all var(--animation-speed);
    box-shadow: var(--shadow-secondary);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
    background: rgba(59, 130, 246, 0.2);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(20px);
    transition: all var(--animation-speed);
    box-shadow: var(--shadow-secondary);
}

.theme-toggle:hover {
    transform: rotate(180deg);
    background: var(--accent-gradient);
    color: white;
}

/* Navigation */
.navigation {
    position: fixed;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all var(--animation-speed);
    position: relative;
}

.nav-dot.active {
    background: var(--accent-gradient);
    transform: scale(1.3);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.6);
}

.nav-dot:hover {
    transform: scale(1.2);
    background: var(--secondary-gradient);
}

/* Glass Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.glass-container {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-primary);
    margin: 2rem 0;
    overflow: hidden;
    transition: all var(--animation-speed);
}

.glass-container:hover {
    transform: translateY(-5px);
    box-shadow: 0 35px 70px -12px rgba(37, 99, 235, 0.3);
}

/* Sections */
.section {
    padding: 4rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    backdrop-filter: blur(20px);
    transition: all var(--animation-speed);
    position: relative;
    overflow: hidden;
}

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

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

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-primary);
    border-color: rgba(59, 130, 246, 0.3);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.card-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-sm);
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

.card-content ul {
    list-style: none;
    margin-top: 1rem;
}

.card-content li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.card-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: #3b82f6;
    font-weight: bold;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.skill-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    padding: 1.5rem;
    backdrop-filter: blur(20px);
    transition: all var(--animation-speed);
}

.skill-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-secondary);
    border-color: rgba(59, 130, 246, 0.3);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.skill-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--secondary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.3);
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Progress Animation */
.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-top: 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    width: 0;
    transition: width 2s ease-in-out;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

/* Certifications */
.cert-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-sm);
    backdrop-filter: blur(20px);
    margin: 0.5rem;
    transition: all var(--animation-speed);
}

.cert-badge:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-secondary);
    border-color: rgba(59, 130, 246, 0.3);
}

.cert-icon {
    color: #3b82f6;
    font-size: 1.2rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem 0;
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--animation-speed);
    backdrop-filter: blur(20px);
}

.social-link:hover {
    transform: translateY(-3px);
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-contact {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .navigation {
        display: none;
    }

    .theme-toggle {
        top: 1rem;
        right: 1rem;
        width: 50px;
        height: 50px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 2rem 0;
    }

    .container {
        padding: 0 1rem;
    }
}

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Loading animation */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}