/* ===== CSS Variables & Design Tokens ===== */
:root {
    /* Colors */
    --primary: #00d4ff;
    --primary-glow: rgba(0, 212, 255, 0.4);
    --secondary: #f0c674;
    --accent: #a855f7;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-bg-hover: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(255, 255, 255, 0.2);
    --glass-blur: 20px;
    
    /* Background */
    --bg-dark: #0a0a1a;
    --bg-gradient: linear-gradient(135deg, #0a0a1a 0%, #1a1a3e 50%, #0a1628 100%);
    
    /* Text */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* Spacing */
    --section-padding: 100px 20px;
    --card-padding: 24px;
    --border-radius: 16px;
    
    /* Typography */
    --font-main: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

/* ===== Language Toggle ===== */
.lang-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 8px 16px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-toggle:hover {
    background: var(--glass-bg-hover);
    border-color: var(--primary);
    box-shadow: 0 0 20px var(--primary-glow);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 40px 20px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--bg-gradient);
    overflow: hidden;
}

.hero-bg::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    top: -200px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.hero-bg::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.2) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-logo {
    width: 160px;
    height: 160px;
    object-fit: contain;
    margin-bottom: 24px;
    filter: drop-shadow(0 0 30px var(--primary-glow));
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { filter: drop-shadow(0 0 30px var(--primary-glow)); }
    50% { filter: drop-shadow(0 0 50px var(--primary-glow)); }
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-style: italic;
}

.hero-intro {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.hero-links {
    display: flex;
    gap: 16px;
    justify-content: center;
     flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.hero-btn:hover {
    background: var(--glass-bg-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 10px 40px var(--primary-glow);
}

.scroll-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 14px;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===== Section Styles ===== */
.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Projects Section ===== */
.projects {
    padding: var(--section-padding);
    max-width: 1400px;
    margin: 0 auto;
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 48px;
    flex-wrap: wrap;
    position: relative;
    z-index: 10;
}

.tab-btn {
    padding: 10px 20px;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--text-primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-color: transparent;
    color: var(--text-primary);
    box-shadow: 0 4px 20px var(--primary-glow);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* ===== Project Card ===== */
.project-card {
    position: relative;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: var(--card-padding);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 212, 255, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none; /* Fix: Allow clicks to pass through */
    z-index: 1;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: var(--glass-border-hover);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.3),
        0 0 40px var(--primary-glow);
}

.project-card:hover::before {
    opacity: 1;
}

.project-card.featured {
    grid-column: span 1;
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, var(--glass-bg) 100%);
}

@media (min-width: 768px) {
    .project-card.featured {
        grid-column: span 2;
    }
}

.card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 2;
}

.card-badge.wip {
    background: linear-gradient(135deg, var(--secondary), #e67e22);
}

.card-badge.active {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.card-badge.maint {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.card-badge.done {
    background: linear-gradient(135deg, #8b5cf6, #7c3aed);
    color: white;
}

.card-badge.archived {
    background: linear-gradient(135deg, #64748b, #475569);
    color: white;
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
    height: 64px;
    width: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.card-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
}

.project-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    transition: all 0.3s ease;
    position: relative; /* Fix: Ensure link is above overlay */
    z-index: 10;
}

.card-link:hover {
    gap: 12px;
    text-shadow: 0 0 10px var(--primary-glow);
}

/* Hidden cards (for filtering) */
.project-card.hidden {
    display: none;
}

/* ===== About Section ===== */
.about {
    padding: var(--section-padding);
    max-width: 900px;
    margin: 0 auto;
}

.about-content {
    text-align: center;
}

.glass-card {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur));
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 48px;
}

.about-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.tech-tag {
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(168, 85, 247, 0.2));
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tech-tag:hover {
    border-color: var(--primary);
    box-shadow: 0 0 20px var(--primary-glow);
    transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
    padding: 40px 20px;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --section-padding: 60px 16px;
        --card-padding: 20px;
    }
    
    .hero-logo {
        width: 120px;
        height: 120px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .glass-card {
        padding: 32px 20px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .category-tabs {
        gap: 6px;
    }
    
    .tab-btn {
        padding: 8px 14px;
        font-size: 13px;
    }
}