/* reset & base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent-green: #5ba14e;
    --accent-yellow: #c9da00;
    --accent-blue: #5672d2;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 4rem;
}

html {
    scroll-behavior: smooth;
}

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

/* animated background */
.animated-bg {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(91, 161, 78, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(201, 218, 0, 0.02) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(86, 114, 210, 0.03) 0%, transparent 50%);
    z-index: -2;
    animation: bgPulse 15s ease-in-out infinite;
}

.particles {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: particleFloat 20s linear infinite;
}

/* navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-lg);
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.05em;
    transition: var(--transition-fast);
}

.logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: var(--transition-fast);
}

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

.nav-number {
    color: var(--accent-green);
    font-size: 0.75rem;
    opacity: 0.6;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 2rem;
    height: 2rem;
    position: relative;
}

.hamburger {
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    transition: var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.hamburger::before { top: -0.5rem; }
.hamburger::after { bottom: -0.5rem; }

/* main */
.main {
    padding-top: 6rem;
}

/* hero */
.hero {
    padding: var(--space-xl) var(--space-lg);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.intro-line {
    font-size: 1rem;
    color: var(--accent-green);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.hero-name {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.05em;
}

.cursor {
    color: var(--accent-yellow);
    animation: blink 1s infinite;
}

.hero-title {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.title-text {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.tech-badge {
    background: rgba(86, 114, 210, 0.1);
    border: 1px solid rgba(86, 114, 210, 0.3);
    padding: var(--space-xs) var(--space-sm);
    border-radius: 2rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--accent-blue);
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 32rem;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-radius: 2rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-green);
    color: var(--bg-primary);
    border-color: var(--accent-green);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(91, 161, 78, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.visual-container {
    position: relative;
    height: 30rem;
}

.code-visual {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24rem;
    height: 16rem;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.code-line {
    height: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.25rem;
    animation: codeLine 3s ease-in-out infinite;
}

.code-line:nth-child(1) { width: 80%; animation-delay: 0s; }
.code-line:nth-child(2) { width: 60%; animation-delay: 0.2s; }
.code-line:nth-child(3) { width: 90%; animation-delay: 0.4s; }
.code-line:nth-child(4) { width: 70%; animation-delay: 0.6s; }
.code-line.highlight { background: var(--accent-blue); animation: highlightPulse 2s ease-in-out infinite; }

.tech-icons {
    position: absolute;
    width: 100%;
    height: 100%;
}

.tech-icon {
    position: absolute;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    font-size: 1.5rem;
    animation: techIconFloat 6s ease-in-out infinite;
}

.tech-icon:nth-child(1) { top: 10%; left: 10%; color: var(--accent-blue); animation-delay: 0s; }
.tech-icon:nth-child(2) { top: 70%; right: 15%; color: var(--accent-yellow); animation-delay: 1s; }
.tech-icon:nth-child(3) { bottom: 20%; left: 20%; color: var(--accent-green); animation-delay: 2s; }
.tech-icon:nth-child(4) { top: 30%; right: 30%; color: var(--text-primary); animation-delay: 3s; }

/* section headers */
.section-header {
    margin-bottom: var(--space-xl);
    padding: 0 var(--space-lg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.05em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.title-number {
    color: var(--accent-green);
    font-size: 1.5rem;
    opacity: 0.6;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* skills */
.skills {
    padding: var(--space-xl) 0;
    background: var(--bg-secondary);
}

.skills-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

.skill-card {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: var(--space-lg);
    transition: var(--transition-smooth);
}

.skill-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.skill-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.skill-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 0.75rem;
    font-size: 1.5rem;
}

.html-icon { color: var(--accent-green); }
.css-icon { color: var(--accent-yellow); }
.c-icon { color: var(--accent-blue); }
.js-icon { color: var(--accent-green); }

.skill-info {
    flex: 1;
}

.skill-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.skill-percentage {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* dotted progress bar */
.skill-bar {
    height: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 0.5rem;
    margin-bottom: var(--space-md);
    overflow: visible;
    position: relative;
}

.skill-progress {
    height: 100%;
    border-radius: 0.5rem;
    transform-origin: left;
    position: relative;
    background-image:
        repeating-linear-gradient(
            90deg,
            currentColor 0px,
            currentColor 4px,
            transparent 4px,
            transparent 12px
        );
    opacity: 0;
    transform: scaleX(0);
}

.skill-progress::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 0.5rem;
    background: inherit;
    filter: blur(8px);
    opacity: 0.3;
    z-index: -1;
}

.skill-tags {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.skill-tag {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.03);
    border-radius: 1rem;
    color: var(--text-secondary);
}

/* projects */
.projects {
    padding: var(--space-xl) 0;
}

.projects-grid {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
}

.project-card {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: var(--space-lg);
    transition: var(--transition-smooth);
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.project-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.75rem;
    font-size: 1.5rem;
}

.green-icon { background: rgba(91, 161, 78, 0.1); color: var(--accent-green); }
.blue-icon { background: rgba(86, 114, 210, 0.1); color: var(--accent-blue); }
.yellow-icon { background: rgba(201, 218, 0, 0.1); color: var(--accent-yellow); }

.project-tags {
    display: flex;
    gap: var(--space-xs);
}

.project-tag {
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.03);
    border-radius: 1rem;
    color: var(--text-secondary);
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.project-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.project-footer {
    display: flex;
    gap: var(--space-md);
}

.project-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--accent-green);
}

/* contact */
.contact {
    padding: var(--space-xl) 0;
    background: var(--bg-secondary);
}

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.contact-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.contact-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    text-decoration: none;
    transition: var(--transition-fast);
}

.contact-method:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.method-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(86, 114, 210, 0.1);
    border-radius: 0.75rem;
    font-size: 1.25rem;
    color: var(--accent-blue);
}

.method-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.method-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--accent-blue);
    color: var(--bg-primary);
    border-color: var(--accent-blue);
}

.contact-form {
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: var(--space-xl);
}

.form-group {
    position: relative;
    margin-bottom: var(--space-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    padding: var(--space-md) 0;
    outline: none;
}

.form-group textarea {
    resize: vertical;
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    transition: var(--transition-fast);
}

.form-group input:focus ~ .form-line,
.form-group textarea:focus ~ .form-line {
    height: 2px;
    background: var(--accent-green);
}

/* footer */
.footer {
    padding: var(--space-xl) var(--space-lg);
    background: var(--bg-tertiary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

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

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.footer-text {
    flex: 1;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-link {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

.scroll-indicator {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 0.25rem;
    height: 8rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    overflow: hidden;
    z-index: 1000;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, var(--accent-green), var(--accent-blue));
    border-radius: 1rem;
    transform: translateY(-100%);
    animation: scrollAnim 2s ease-in-out infinite;
}

/* animations */
@keyframes bgPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

@keyframes particleFloat {
    0% { transform: translate(0, 0) rotate(0deg); opacity: 0; }
    10% { opacity: 0.1; }
    90% { opacity: 0.1; }
    100% { transform: translate(var(--tx, 100vw), var(--ty, -100vh)) rotate(720deg); opacity: 0; }
}

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

@keyframes codeLine {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

@keyframes highlightPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

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

@keyframes scrollAnim {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(100%); }
}

/* responsive */
@media (max-width: 768px) {
    .hero-container,
    .contact-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        padding: var(--space-lg);
    }

    .hero-name {
        font-size: 3rem;
    }

    .hero-title {
        flex-direction: column;
    }

    .visual-container {
        height: 20rem;
    }

    .code-visual {
        width: 18rem;
        height: 12rem;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.5rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        justify-content: center;
    }
}