/* ===== CSS Reset & Variables ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-bg: #0a0a0a;
    --secondary-bg: #111111;
    --accent-color: #00ff88;
    --accent-secondary: #0088ff;
    --accent-tertiary: #ff0088;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --gradient-primary: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    --gradient-secondary: linear-gradient(135deg, var(--accent-secondary), var(--accent-tertiary));
    
    /* Typography */
    --font-primary: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    /* Spacing */
    --section-padding: 120px 0;
    --container-padding: 0 2rem;
    
    /* Effects */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow-glow: 0 0 30px rgba(0, 255, 136, 0.3);
}

/* ===== Base Styles ===== */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

/* ===== Particle Background ===== */
#particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(ellipse at center, rgba(0, 255, 136, 0.1) 0%, transparent 70%);
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 2rem;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    padding: var(--section-padding);
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-avatar {
    position: relative;
    margin-bottom: 2rem;
    display: inline-block;
}

.avatar-ring {
    width: 200px;
    height: 200px;
    border: 3px solid var(--accent-color);
    border-radius: 50%;
    position: relative;
    animation: rotate 10s linear infinite;
}

.avatar-ring::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border-radius: 50%;
    background: conic-gradient(from 0deg, var(--accent-color), var(--accent-secondary), var(--accent-tertiary), var(--accent-color));
    z-index: -1;
    animation: rotate 5s linear infinite reverse;
}

.avatar-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 180px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    border: 1px solid var(--glass-border);
}

.avatar-emoji {
    animation: bounce 2s infinite;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.greeting {
    display: block;
    font-size: 0.4em;
    color: var(--text-secondary);
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.name {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    position: relative;
}

.wave {
    display: inline-block;
    animation: wave 2s infinite;
    transform-origin: 70% 70%;
    margin-left: 0.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

.subtitle-line {
    display: inline-block;
    position: relative;
}

.subtitle-separator {
    margin: 0 1rem;
    color: var(--accent-color);
}

.hero-cta {
    margin-bottom: 4rem;
}

.cta-button {
    background: var(--glass-bg);
    border: 2px solid var(--accent-color);
    color: var(--text-primary);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    font-family: var(--font-primary);
    backdrop-filter: blur(20px);
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left 0.3s ease;
    z-index: -1;
}

.cta-button:hover::before {
    left: 0;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
    border-color: transparent;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-arrow {
    width: 2px;
    height: 40px;
    background: var(--accent-color);
    position: relative;
    animation: scroll-bounce 2s infinite;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: -5px;
    width: 12px;
    height: 12px;
    border-right: 2px solid var(--accent-color);
    border-bottom: 2px solid var(--accent-color);
    transform: rotate(45deg);
}

/* ===== Section Styles ===== */
section {
    padding: var(--section-padding);
}

.section-title {
    display: flex;
    align-items: center;
    margin-bottom: 4rem;
    font-size: 3rem;
    font-weight: 700;
}

.title-number {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-right: 1rem;
}

.title-text {
    margin-right: 2rem;
}

.title-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--accent-color), transparent);
}

/* ===== About Section ===== */
.about {
    background: var(--secondary-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.about-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

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

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Skills Section ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 3rem;
}

.skill-category h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.skill-tag {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.skill-tag:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    transform: translateY(-2px);
}

/* Programming Language Skill Tags */
.skill-tag.primary {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    color: var(--primary-bg);
    font-weight: 600;
    border: 2px solid var(--accent-color);
}

.skill-tag.primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.skill-tag.secondary {
    background: var(--glass-bg);
    border: 2px solid var(--accent-secondary);
    color: var(--accent-secondary);
    font-weight: 500;
}

.skill-tag.secondary:hover {
    background: var(--accent-secondary);
    color: var(--primary-bg);
}

/* English Skill Tag */
.skill-tag.english {
    background: linear-gradient(135deg, var(--accent-tertiary), var(--accent-secondary));
    color: var(--primary-bg);
    font-weight: 600;
    border: 2px solid var(--accent-tertiary);
    font-family: var(--font-mono);
}

.skill-tag.english:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(255, 0, 136, 0.3);
}

/* Interest Tags */
.skill-tag.interest {
    background: var(--glass-bg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
}

.skill-tag.interest::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.skill-tag.interest:hover::before {
    left: 100%;
}

.skill-tag.interest:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Domain Tags (Optional) */
.skill-tag.domain {
    background: var(--glass-bg);
    border: 1px dashed var(--accent-color);
    color: var(--accent-color);
    font-style: italic;
}

.skill-tag.domain:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    border-style: solid;
    font-style: normal;
}

/* ===== Contact Section ===== */
.contact {
    background: var(--secondary-bg);
}

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

.contact-text {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

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

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    border-radius: 50px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.contact-link:hover {
    background: var(--accent-color);
    color: var(--primary-bg);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.signature {
    font-family: var(--font-mono);
    font-size: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: pulse 2s infinite;
}

/* ===== Footer ===== */
.footer {
    padding: 2rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
}

.footer-text, .footer-credit {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.footer-credit a {
    color: var(--accent-color);
    text-decoration: none;
}

/* ===== Animations ===== */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes wave {
    0% { transform: rotate(0deg); }
    10% { transform: rotate(14deg); }
    20% { transform: rotate(-8deg); }
    30% { transform: rotate(14deg); }
    40% { transform: rotate(-4deg); }
    50% { transform: rotate(10deg); }
    60% { transform: rotate(0deg); }
    100% { transform: rotate(0deg); }
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

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

/* ===== Typing Effect ===== */
.typing-text {
    white-space: nowrap;
}

.typing-text.typing-active {
    border-right: 3px solid var(--accent-color);
    animation: blink-caret 0.75s step-end infinite;
}

@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: var(--accent-color); }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px 0;
        --container-padding: 0 1rem;
    }
    
    .nav {
        padding: 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .subtitle-separator {
        display: block;
        margin: 0.5rem 0;
    }
    
    .section-title {
        font-size: 2rem;
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 2rem;
    }
    
    .title-line {
        width: 100%;
        margin-top: 1rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .avatar-ring,
    .avatar-placeholder {
        width: 150px;
        height: 150px;
    }
    
    .avatar-placeholder {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .about-card,
    .skill-category {
        padding: 1.5rem;
    }
}