@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ── DARK THEME (default) ──────────────────────────────────────────────────── */
:root,
[data-theme="dark"] {
    --bg:              #0a0e1a;
    --bg-2:            #0f1528;
    --bg-glass:        rgba(15, 21, 40, 0.7);
    --glass-border:    rgba(99, 149, 255, 0.12);
    --glass-border-h:  rgba(99, 149, 255, 0.35);
    --text-main:       #e2e8f8;
    --text-dim:        #7a8ab0;
    --text-dimmer:     #4a5580;
    --accent:          #6395ff;
    --accent-glow:     rgba(99, 149, 255, 0.2);
    --accent-2:        #a78bfa;
    --green:           #34d399;
    --shadow-card:     0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow:     0 0 40px rgba(99,149,255,0.15);
    --blob-1:          #1a3a8a;
    --blob-2:          #3b1a8a;
    --blob-3:          #0a3a5a;
    --navbar-bg:       rgba(10, 14, 26, 0.88);
    --ctrl-bg:         rgba(255,255,255,0.06);
    --ctrl-bg-h:       rgba(99,149,255,0.15);
    --mono: 'JetBrains Mono', monospace;
    --sans: 'Inter', sans-serif;
}

/* ── LIGHT THEME ────────────────────────────────────────────────────────────── */
[data-theme="light"] {
    --bg:              #f0f4ff;
    --bg-2:            #e4ebff;
    --bg-glass:        rgba(255, 255, 255, 0.72);
    --glass-border:    rgba(37, 99, 235, 0.12);
    --glass-border-h:  rgba(37, 99, 235, 0.4);
    --text-main:       #0f172a;
    --text-dim:        #475569;
    --text-dimmer:     #94a3b8;
    --accent:          #2563eb;
    --accent-glow:     rgba(37, 99, 235, 0.12);
    --accent-2:        #7c3aed;
    --green:           #059669;
    --shadow-card:     0 4px 24px rgba(15,23,42,0.1);
    --shadow-glow:     0 0 30px rgba(37,99,235,0.12);
    --blob-1:          #bfdbfe;
    --blob-2:          #ddd6fe;
    --blob-3:          #bae6fd;
    --navbar-bg:       rgba(240, 244, 255, 0.9);
    --ctrl-bg:         rgba(0,0,0,0.05);
    --ctrl-bg-h:       rgba(37,99,235,0.1);
}

/* ── RESET ──────────────────────────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; scroll-behavior: smooth; }

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: var(--sans);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s, color 0.4s;
}

/* ── BLOBS ──────────────────────────────────────────────────────────────────── */
.bg-blob { position: fixed; border-radius: 50%; filter: blur(110px); pointer-events: none; z-index: 0; opacity: 0.4; transition: opacity 0.4s; }
.blob-1 { width: 600px; height: 600px; background: radial-gradient(circle, var(--blob-1) 0%, transparent 70%); top: -200px; left: -200px; }
.blob-2 { width: 500px; height: 500px; background: radial-gradient(circle, var(--blob-2) 0%, transparent 70%); top: 40%; right: -150px; }
.blob-3 { width: 400px; height: 400px; background: radial-gradient(circle, var(--blob-3) 0%, transparent 70%); bottom: 10%; left: 20%; }
[data-theme="light"] .bg-blob { opacity: 0.5; }

.container { max-width: 960px; margin: 0 auto; padding: 0 2rem; position: relative; z-index: 1; }

/* ── NAVBAR ─────────────────────────────────────────────────────────────────── */
#navbar {
    padding: 1.2rem 0;
    background: var(--navbar-bg);
    border-bottom: 1px solid var(--glass-border);
    position: sticky; top: 0; z-index: 1000;
    backdrop-filter: blur(20px);
    transition: all 0.3s;
}
#navbar.scrolled { padding: 0.75rem 0; box-shadow: var(--shadow-card); }
.nav-container { display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; }

.term-logo { font-family: var(--mono); font-size: 1.1rem; font-weight: 600; letter-spacing: 0.02em; white-space: nowrap; }
.logo-bracket { color: var(--text-dim); }
.logo-slash { color: var(--accent); }

.nav-links { display: flex; gap: 1.6rem; list-style: none; }
.nav-links a { text-decoration: none; color: var(--text-dim); font-size: 0.85rem; font-weight: 500; font-family: var(--mono); transition: color 0.2s; letter-spacing: 0.03em; }
.nav-links a:hover { color: var(--text-main); }
.nav-links a.nav-cta { color: var(--accent); border: 1px solid var(--glass-border-h); padding: 0.35rem 0.9rem; border-radius: 6px; transition: all 0.2s; }
.nav-links a.nav-cta:hover { background: var(--accent-glow); }

/* Controls */
.nav-controls { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.ctrl-btn {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px;
    background: var(--ctrl-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: var(--mono);
    font-weight: 600;
    transition: all 0.2s;
    letter-spacing: 0;
}
.ctrl-btn:hover { background: var(--ctrl-bg-h); border-color: var(--glass-border-h); color: var(--accent); }
.lang-toggle { font-size: 0.75rem; }

/* ── GLASS CARD ─────────────────────────────────────────────────────────────── */
.glass-card {
    background: var(--bg-glass);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s, background 0.4s;
}
.glass-card:hover { border-color: var(--glass-border-h); box-shadow: var(--shadow-glow); }

/* ── SECTIONS ───────────────────────────────────────────────────────────────── */
.section { padding: 6rem 0; }
.section-title { font-size: 1.8rem; font-weight: 700; margin-bottom: 3rem; color: var(--text-main); letter-spacing: -0.02em; }
.title-num { font-family: var(--mono); font-size: 1rem; color: var(--accent); margin-right: 0.6rem; font-weight: 400; }

/* Fade-up animation */
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── HERO ───────────────────────────────────────────────────────────────────── */
.hero { padding-top: 7rem; padding-bottom: 7rem; }
.hero-grid { display: grid; grid-template-columns: auto 1fr; gap: 4rem; align-items: center; }

.hero-image-wrap { position: relative; display: flex; flex-direction: column; align-items: center; gap: 1.2rem; }
.hero-img-glow {
    position: absolute; width: 280px; height: 280px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    border-radius: 50%; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse-glow 3s ease-in-out infinite;
}
@keyframes pulse-glow {
    0%,100% { opacity: 0.5; transform: translate(-50%,-50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%,-50%) scale(1.08); }
}
.profile-img {
    width: 220px;
    height: 220px;
    border-radius: 20px;
    object-fit: cover;
    border: 2px solid var(--glass-border-h);
    box-shadow: var(--shadow-card), var(--shadow-glow);
    position: relative;
    z-index: 1;
    transition: border-color 0.4s;
}
.engineer-avatar-card {
    width: 220px;
    padding: 0.8rem;
    position: relative;
    z-index: 1;
    border: 1px solid var(--glass-border-h);
    box-shadow: var(--shadow-card);
}
.eac-header { display: flex; align-items: center; gap: 0.4rem; margin-bottom: 0.8rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--glass-border); }
.eac-dot { width: 8px; height: 8px; border-radius: 50%; }
.eac-dot.red { background: #ff5f56; }
.eac-dot.yellow { background: #ffbd2e; }
.eac-dot.green { background: #27c93f; }
.eac-title { font-family: var(--mono); font-size: 0.72rem; color: var(--text-dim); margin-left: auto; }
.eac-body { display: flex; flex-direction: column; gap: 0.8rem; }
.eac-icon { font-size: 2.2rem; color: var(--accent); align-self: flex-start; }
.eac-code { font-family: var(--mono); font-size: 0.76rem; color: var(--text-dim); line-height: 1.5; background: rgba(0,0,0,0.15); padding: 0.6rem; border-radius: 8px; border: 1px solid var(--glass-border); }
.code-keyword { color: var(--accent-2); font-weight: 600; }
.code-string { color: var(--green); }
.status-badge {
    display: flex; align-items: center; gap: 0.5rem;
    background: rgba(52,211,153,0.1); border: 1px solid rgba(52,211,153,0.3);
    border-radius: 999px; padding: 0.4rem 1rem;
    font-size: 0.78rem; color: var(--green); font-family: var(--mono); white-space: nowrap;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); animation: blink 1.5s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0.3;} }

.hero-greeting { color: var(--text-dim); font-size: 1rem; font-family: var(--mono); margin-bottom: 0.3rem; }
.hero-title {
    font-size: 3.5rem; font-weight: 800; letter-spacing: -0.04em; margin-bottom: 0.8rem;
    background: linear-gradient(135deg, var(--text-main) 30%, var(--accent) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-role-wrap { display: flex; align-items: center; margin-bottom: 1.5rem; }
.role-prefix { font-family: var(--mono); color: var(--accent); font-size: 1.1rem; }
.hero-typed { font-family: var(--mono); font-size: 1.1rem; color: var(--text-main); font-weight: 500; }
.cursor-blink { font-family: var(--mono); color: var(--accent); font-size: 1.1rem; animation: cursor 0.8s step-end infinite; }
@keyframes cursor { 0%,100%{opacity:1;} 50%{opacity:0;} }

.hero-intro { color: var(--text-dim); font-size: 1rem; line-height: 1.75; max-width: 520px; margin-bottom: 2rem; }
.hero-intro strong { color: var(--text-main); }

.hero-actions { display: flex; gap: 1rem; margin-bottom: 2.5rem; flex-wrap: wrap; }
.btn-primary {
    display: inline-flex; align-items: center; gap: 0.5rem;
    background: var(--accent); color: #fff;
    padding: 0.75rem 1.5rem; border-radius: 10px;
    text-decoration: none; font-weight: 600; font-size: 0.9rem;
    transition: all 0.2s; box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { filter: brightness(1.15); transform: translateY(-2px); }
.btn-secondary {
    display: inline-flex; align-items: center; gap: 0.5rem;
    background: transparent; color: var(--text-main);
    padding: 0.75rem 1.5rem; border-radius: 10px;
    text-decoration: none; font-weight: 600; font-size: 0.9rem;
    border: 1px solid var(--glass-border-h); transition: all 0.2s;
}
.btn-secondary:hover { background: var(--accent-glow); border-color: var(--accent); transform: translateY(-2px); }

.hero-stats { display: flex; align-items: center; gap: 1.5rem; }
.stat-item { display: flex; flex-direction: column; }
.stat-num { font-size: 1.6rem; font-weight: 800; color: var(--text-main); letter-spacing: -0.04em; line-height: 1; }
.stat-label { font-size: 0.75rem; color: var(--text-dim); font-family: var(--mono); margin-top: 0.2rem; }
.stat-divider { width: 1px; height: 36px; background: var(--glass-border); }

/* ── ABOUT ──────────────────────────────────────────────────────────────────── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.about-text { padding: 2rem; }
.about-text p { color: var(--text-dim); line-height: 1.8; margin-bottom: 1rem; font-size: 0.95rem; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { color: var(--text-main); }
.about-edu { padding: 2rem; }
.edu-header { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 1.5rem; }
.edu-icon { font-size: 1.3rem; color: var(--accent); }
.edu-header h3 { font-size: 1rem; font-weight: 600; color: var(--text-main); }
.edu-school { font-size: 1.1rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.2rem; }
.edu-degree { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); margin-bottom: 0.8rem; }
.edu-meta { display: flex; flex-direction: column; gap: 0.4rem; font-size: 0.82rem; color: var(--text-dim); margin-bottom: 1.2rem; }
.edu-meta i { margin-right: 0.4rem; color: var(--accent); }
.gpa-badge { background: var(--accent-glow); border: 1px solid var(--glass-border-h); border-radius: 6px; padding: 0.2rem 0.6rem; font-family: var(--mono); font-size: 0.8rem; color: var(--accent); width: fit-content; }
.edu-badges { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.edu-tag { background: rgba(167,139,250,0.1); border: 1px solid rgba(167,139,250,0.25); border-radius: 6px; padding: 0.3rem 0.7rem; font-size: 0.78rem; color: var(--accent-2); font-family: var(--mono); }

/* ── TIMELINE ───────────────────────────────────────────────────────────────── */
.timeline-item { display: grid; grid-template-columns: auto 1fr; gap: 1.5rem; margin-bottom: 2rem; }
.timeline-marker { display: flex; flex-direction: column; align-items: center; padding-top: 1.5rem; }
.marker-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent-glow); flex-shrink: 0; }
.marker-line { flex: 1; width: 2px; background: var(--glass-border); margin-top: 8px; min-height: 40px; }
.timeline-card { padding: 1.8rem; }
.tc-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap; }
.tc-role { font-size: 1.1rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.2rem; }
.tc-company { font-family: var(--mono); font-size: 0.9rem; color: var(--accent); font-weight: 500; }
.tc-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 0.3rem; text-align: right; }
.tc-date { font-family: var(--mono); font-size: 0.8rem; color: var(--text-dim); }
.tc-loc { font-size: 0.8rem; color: var(--text-dimmer); }
.tc-loc i { margin-right: 0.3rem; }
.tc-points { list-style: none; margin-bottom: 1.2rem; }
.tc-points li { color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; padding-left: 1.2rem; position: relative; margin-bottom: 0.5rem; }
.tc-points li::before { content: "→"; position: absolute; left: 0; color: var(--accent); }
.tc-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tc-tags span { background: var(--accent-glow); border: 1px solid var(--glass-border-h); border-radius: 6px; padding: 0.2rem 0.7rem; font-size: 0.75rem; color: var(--accent); font-family: var(--mono); }

/* ── PROJECTS ───────────────────────────────────────────────────────────────── */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 1.5rem; }
.project-card { padding: 1.8rem; display: flex; flex-direction: column; position: relative; overflow: hidden; }
.project-card.featured::before { content:''; position:absolute; top:0; left:0; right:0; height:2px; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.project-card:hover { transform: translateY(-6px); }
.pc-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.pc-badge { font-family: var(--mono); font-size: 0.72rem; background: var(--accent-glow); border: 1px solid var(--glass-border-h); border-radius: 4px; padding: 0.2rem 0.6rem; color: var(--accent); font-weight: 600; }
.pc-links a { color: var(--text-dim); font-size: 1rem; transition: color 0.2s; margin-left: 0.8rem; }
.pc-links a:hover { color: var(--accent); }
.project-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.7rem; line-height: 1.4; }
.project-card p { color: var(--text-dim); font-size: 0.88rem; line-height: 1.65; flex-grow: 1; margin-bottom: 1.2rem; }
.pc-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.pc-tags span { background: var(--ctrl-bg); border: 1px solid var(--glass-border); border-radius: 4px; padding: 0.15rem 0.55rem; font-size: 0.72rem; color: var(--text-dim); font-family: var(--mono); }

/* ── PUBLICATIONS ────────────────────────────────────────────────────────────── */
.pub-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.pub-card { padding: 2rem; grid-column: 1 / -1; display: flex; gap: 2rem; align-items: flex-start; }
.pub-card.pub-highlight { border-color: var(--glass-border-h); background: var(--accent-glow); }
.pub-icon { width: 48px; height: 48px; border-radius: 12px; background: var(--accent-glow); border: 1px solid var(--glass-border-h); display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 1.3rem; flex-shrink: 0; }
.pub-venue { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); font-weight: 600; display: block; margin-bottom: 0.5rem; }
.pub-content h3 { font-size: 1rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.7rem; line-height: 1.4; }
.pub-content p { color: var(--text-dim); font-size: 0.88rem; line-height: 1.65; margin-bottom: 1rem; }
.pub-content strong { color: var(--text-main); }
.pub-link { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--accent); font-size: 0.85rem; font-family: var(--mono); text-decoration: none; transition: gap 0.2s; }
.pub-link:hover { gap: 0.7rem; }
.comp-card { padding: 1.8rem; }
.comp-rank { font-size: 1.4rem; margin-bottom: 0.7rem; }
.comp-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.7rem; }
.comp-card p { color: var(--text-dim); font-size: 0.88rem; line-height: 1.65; margin-bottom: 0.8rem; }
.comp-org { font-family: var(--mono); font-size: 0.75rem; color: var(--text-dimmer); display: block; }

/* ── SKILLS ──────────────────────────────────────────────────────────────────── */
.skills-layout { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.2rem; }
.skill-group { padding: 1.5rem; }
.skill-group h3 { font-family: var(--mono); font-size: 0.8rem; color: var(--text-dim); margin-bottom: 1.2rem; display: flex; align-items: center; gap: 0.5rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }
.skill-group h3 i { color: var(--accent); }
.skill-chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.skill-chip { display: flex; align-items: center; gap: 0.5rem; background: var(--ctrl-bg); border: 1px solid var(--glass-border); border-radius: 8px; padding: 0.4rem 0.8rem; font-size: 0.83rem; color: var(--text-main); font-weight: 500; transition: all 0.2s; }
.skill-chip:hover { border-color: var(--glass-border-h); background: var(--accent-glow); }
.skill-chip i { font-size: 1.1rem; }
.lang-chip { flex-direction: column; align-items: flex-start; padding: 0.6rem 0.9rem; gap: 0.1rem; }
.lang-level { font-size: 0.72rem; color: var(--text-dim); font-family: var(--mono); }

/* ── CONTACT ─────────────────────────────────────────────────────────────────── */
.contact-wrap { padding: 2.5rem; display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
.contact-left h3 { font-size: 1.5rem; font-weight: 700; color: var(--text-main); margin-bottom: 0.7rem; }
.contact-left p { color: var(--text-dim); font-size: 0.95rem; line-height: 1.6; }
.contact-right { display: flex; flex-direction: column; gap: 0.8rem; }
.contact-row { display: flex; align-items: center; gap: 1rem; color: var(--text-main); text-decoration: none; background: var(--ctrl-bg); border: 1px solid var(--glass-border); border-radius: 10px; padding: 0.9rem 1.2rem; font-family: var(--mono); font-size: 0.85rem; transition: all 0.2s; }
.contact-row:hover { border-color: var(--glass-border-h); background: var(--accent-glow); transform: translateX(4px); }
.cr-icon { width: 36px; height: 36px; border-radius: 8px; background: var(--accent-glow); border: 1px solid var(--glass-border-h); display: flex; align-items: center; justify-content: center; color: var(--accent); font-size: 0.9rem; flex-shrink: 0; }
.footer-note { text-align: center; margin-top: 3rem; color: var(--text-dimmer); font-family: var(--mono); font-size: 0.8rem; }

/* ── HAMBURGER ───────────────────────────────────────────────────────────────── */
.hamburger { display: none; flex-direction: column; cursor: pointer; gap: 5px; z-index: 1001; }
.hamburger .bar { width: 22px; height: 2px; background: var(--text-dim); border-radius: 2px; transition: all 0.3s; }

/* ── RESPONSIVE ─────────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .about-grid { grid-template-columns: 1fr; }
    .contact-wrap { grid-template-columns: 1fr; }
    .pub-grid { grid-template-columns: 1fr; }
    .pub-card { grid-column: 1; }
}

@media (max-width: 768px) {
    .container { padding: 0 1.2rem; }
    .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 2.5rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-image-wrap { order: -1; }
    .hero-intro { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .section { padding: 4rem 0; }

    .hamburger { display: flex; }
    .nav-links {
        display: flex; flex-direction: column; position: absolute;
        top: 100%; left: 0; width: 100%;
        background: var(--navbar-bg);
        align-items: center; padding: 1.5rem 0;
        border-bottom: 1px solid var(--glass-border);
        box-shadow: var(--shadow-card);
        opacity: 0; visibility: hidden; transform: translateY(-10px);
        transition: all 0.3s; z-index: 999;
    }
    .nav-links.active { opacity: 1; visibility: visible; transform: translateY(0); }
    .nav-links li { margin: 0.8rem 0; }
    .nav-links a { font-size: 1rem; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .timeline-item { grid-template-columns: 1fr; }
    .timeline-marker { display: none; }
    .tc-header { flex-direction: column; }
    .tc-meta { align-items: flex-start; text-align: left; }

    .pub-card { flex-direction: column; }
    .hero-role-wrap { justify-content: center; }
}