:root {
    --bg: #0a0a0f;
    --surface: #111118;
    --surface-2: #16161f;
    --border: #1e1e2a;
    --text: #c8c8d4;
    --text-muted: #7a7a8c;
    --accent: #2dd4bf;
    --accent-dim: #0f766e;
    --accent-glow: rgba(45, 212, 191, 0.12);
    --red: #f87171;
    --red-dim: rgba(248, 113, 113, 0.1);
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --radius: 10px;
    --radius-sm: 6px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: #1e1e2a #0a0a0f;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    min-height: 100vh;
}

.bg-grid {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 30%, transparent 70%);
}

.container {
    position: relative;
    z-index: 1;
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
}

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.78);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
}

.nav-inner {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 54px;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: -0.3px;
    text-decoration: none;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    transition: color var(--transition);
    letter-spacing: 0.1px;
}

.nav-links a:hover {
    color: #e0e0e8;
}

.nav-cta {
    background: var(--accent-dim);
    color: var(--accent) !important;
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 0.8rem !important;
    font-weight: 600 !important;
    transition: all var(--transition);
    border: 1px solid transparent;
}

.nav-cta:hover {
    background: transparent !important;
    border-color: var(--accent);
    color: var(--accent) !important;
}

section {
    padding: 70px 0;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--accent);
    margin-bottom: 10px;
    font-weight: 500;
}

.section-title {
    font-size: 1.9rem;
    font-weight: 700;
    letter-spacing: -0.6px;
    color: #e8e8f0;
    margin-bottom: 32px;
    line-height: 1.25;
}

.hero {
    padding-top: 80px;
    padding-bottom: 50px;
}

.hero-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 1.8px;
    text-transform: uppercase;
    color: var(--accent);
    border: 1px solid rgba(45, 212, 191, 0.25);
    border-radius: 20px;
    padding: 6px 16px;
    margin-bottom: 22px;
    background: rgba(45, 212, 191, 0.04);
}

.hero h1 {
    font-size: clamp(2.4rem, 5vw, 3.2rem);
    font-weight: 800;
    letter-spacing: -1.2px;
    color: #f0f0f8;
    line-height: 1.1;
    margin-bottom: 12px;
}

.hero h1 span {
    color: var(--accent);
}

.hero-sub {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 520px;
    margin-bottom: 28px;
    font-weight: 400;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.73rem;
    padding: 6px 14px;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    letter-spacing: 0.3px;
    transition: all var(--transition);
}

.tag.highlight {
    border-color: rgba(248, 113, 113, 0.35);
    background: var(--red-dim);
    color: var(--red);
    font-weight: 500;
}

.edu-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 26px;
    margin-bottom: 14px;
    display: flex;
    align-items: flex-start;
    gap: 18px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.edu-card:hover {
    border-color: #2a2a3a;
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.edu-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
    border: 1px solid var(--border);
}

.edu-info h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #e0e0ea;
    letter-spacing: -0.2px;
}

.edu-info .edu-major {
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: 500;
    margin: 2px 0;
}

.edu-status {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.4px;
    padding: 3px 10px;
    border-radius: 12px;
    margin-top: 6px;
    font-weight: 500;
}

.status-done {
    background: rgba(45, 212, 191, 0.1);
    color: var(--accent);
    border: 1px solid rgba(45, 212, 191, 0.2);
}

.status-ongoing {
    background: rgba(250, 204, 21, 0.08);
    color: #facc15;
    border: 1px solid rgba(250, 204, 21, 0.2);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
}

.skill-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--accent-dim);
    border-radius: 0 2px 2px 0;
    opacity: 0;
    transition: opacity var(--transition);
}

.skill-card:hover {
    border-color: #2a2a3a;
}

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

.skill-card h4 {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
    font-weight: 500;
}

.skill-card .skill-items {
    font-size: 0.88rem;
    color: #c0c0cc;
    line-height: 1.7;
}

.skill-card .skill-items span {
    display: inline-block;
    background: var(--surface-2);
    padding: 3px 10px;
    border-radius: 4px;
    margin: 2px 4px 2px 0;
    font-size: 0.78rem;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.skill-card .skill-items span:hover {
    border-color: #3a3a4a;
    color: #e8e8f0;
}

.highlight-box {
    background: var(--surface);
    border: 1px solid rgba(248, 113, 113, 0.25);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-top: 20px;
    position: relative;
    background: linear-gradient(135deg, rgba(248, 113, 113, 0.04) 0%, var(--surface) 40%);
}

.highlight-box h4 {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    color: var(--red);
    margin-bottom: 6px;
}

.highlight-box p {
    font-size: 0.95rem;
    color: #d0d0da;
    line-height: 1.6;
}

footer {
    border-top: 1px solid var(--border);
    padding: 36px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
}

footer .contact-line {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.3px;
    color: #a0a0b0;
    margin-bottom: 4px;
}

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

footer .contact-line a:hover {
    color: #5eead4;
}

@media (max-width: 640px) {
    .nav-links {
        gap: 14px;
    }
    .nav-links a {
        font-size: 0.76rem;
    }
    .nav-cta {
        padding: 5px 12px;
        font-size: 0.7rem !important;
    }
    .hero h1 {
        font-size: 1.9rem;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .skills-grid {
        grid-template-columns: 1fr;
    }
    .edu-card {
        flex-direction: column;
        gap: 10px;
    }
    section {
        padding: 44px 0;
    }
    .hero {
        padding-top: 50px;
    }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(18px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-in {
    animation: fadeUp 0.6s ease forwards;
}

.delay-1 { animation-delay: 0.1s; opacity: 0; }
.delay-2 { animation-delay: 0.2s; opacity: 0; }
.delay-3 { animation-delay: 0.3s; opacity: 0; }