/* ================================================
   RESET & BASE
================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ================================================
   DESIGN TOKENS
================================================ */
:root {
    --bg:           #030712;
    --bg2:          #0f172a;
    --bg3:          #1e293b;
    --card:         rgba(15, 23, 42, 0.65);
    --card-hover:   rgba(15, 23, 42, 0.92);
    --border:       rgba(255,255,255,0.07);
    --border-h:     rgba(255,255,255,0.14);
    --border-blue:  rgba(59,130,246,0.38);

    --text:         #f1f5f9;
    --text2:        #94a3b8;
    --text3:        #475569;

    --blue:         #3b82f6;
    --blue-d:       #1d4ed8;
    --blue-l:       #60a5fa;
    --green:        #10b981;
    --green-d:      #059669;
    --green-l:      #34d399;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --nav-h: 68px;
    --pad-section: clamp(60px, 9vw, 110px);
    --max-w: 1180px;
    --px: clamp(18px, 5vw, 72px);
    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 18px;
    --r-xl: 26px;
}

/* ================================================
   LAYOUT HELPERS
================================================ */
.wrap    { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--px); }
.section { padding: var(--pad-section) 0; position: relative; z-index: 1; }

.section-label {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: .72rem; font-weight: 700; letter-spacing: .1em;
    text-transform: uppercase; color: var(--blue); margin-bottom: 10px;
}
.section-label::before {
    content: ''; display: block; width: 18px; height: 2px;
    background: var(--blue); border-radius: 2px;
}

/* ================================================
   BADGE
================================================ */
.badge {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 10px; border-radius: 100px;
    font-size: .68rem; font-weight: 600; letter-spacing: .02em;
}
.b-blue   { background: rgba(59,130,246,.12);  color: var(--blue-l);  border: 1px solid rgba(59,130,246,.22); }
.b-green  { background: rgba(16,185,129,.12);  color: var(--green-l); border: 1px solid rgba(16,185,129,.22); }
.b-purple { background: rgba(168,85,247,.12);  color: #c084fc;        border: 1px solid rgba(168,85,247,.22); }
.b-orange { background: rgba(251,146,60,.12);  color: #fb923c;        border: 1px solid rgba(251,146,60,.22); }
.b-gray   { background: rgba(100,116,139,.1);  color: var(--text2);   border: 1px solid rgba(100,116,139,.2); }

/* ================================================
   GLASS CARD
================================================ */
.glass {
    background: var(--card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    transition: border-color .25s, box-shadow .25s;
}
.glass:hover { border-color: var(--border-h); }

/* ================================================
   BUTTONS
================================================ */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border-radius: var(--r-md);
    font-size: .85rem; font-weight: 600; cursor: pointer;
    transition: all .2s; border: none; font-family: inherit;
}
.btn-primary {
    background: linear-gradient(135deg, var(--blue-d), var(--blue));
    color: #fff; box-shadow: 0 4px 14px rgba(59,130,246,.32);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(59,130,246,.42); }
.btn-ghost {
    background: transparent; color: var(--text2);
    border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--border-h); color: var(--text); background: rgba(255,255,255,.04); }

.icon-btn {
    width: 40px; height: 40px; border-radius: var(--r-md);
    display: inline-flex; align-items: center; justify-content: center;
    background: transparent; border: 1px solid var(--border);
    color: var(--text2); cursor: pointer;
    transition: all .2s; font-size: 1rem;
}
.icon-btn:hover { border-color: var(--blue); color: var(--blue-l); background: rgba(59,130,246,.08); }

/* ================================================
   AMBIENT BACKGROUND
================================================ */
.bg-grid {
    position: fixed; inset: 0; z-index: 0; pointer-events: none;
    background-image:
        linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
    background-size: 48px 48px;
}
.glow-1 {
    position: fixed; top: -15%; left: -8%; width: 640px; height: 640px;
    background: radial-gradient(circle, rgba(59,130,246,.07) 0%, transparent 70%);
    pointer-events: none; z-index: 0;
}
.glow-2 {
    position: fixed; bottom: 10%; right: -8%; width: 520px; height: 520px;
    background: radial-gradient(circle, rgba(16,185,129,.055) 0%, transparent 70%);
    pointer-events: none; z-index: 0;
}

/* ================================================
   NAVIGATION
================================================ */
#nav {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--nav-h); z-index: 200; transition: all .3s;
}
#nav.scrolled {
    background: rgba(3,7,18,.82);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border-bottom: 1px solid var(--border);
}
.nav-wrap {
    max-width: var(--max-w); margin: 0 auto; padding: 0 var(--px);
    height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    font-size: 1.05rem; font-weight: 800; letter-spacing: -.04em;
    background: linear-gradient(135deg, #fff, var(--blue-l));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.nav-links { display: flex; align-items: center; gap: 30px; list-style: none; }
.nav-links a { font-size: .84rem; font-weight: 500; color: var(--text2); transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-right { display: flex; gap: 10px; align-items: center; }
.nav-cta { padding: 8px 16px; font-size: .78rem; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text2); border-radius: 2px; transition: all .3s; }

/* ================================================
   SECTION 1 — HERO
================================================ */
#hero {
    min-height: 100vh; display: flex; align-items: center;
    padding-top: var(--nav-h); position: relative; overflow: hidden;
}
.hero-grid {
    display: grid; grid-template-columns: 290px 1fr;
    gap: 64px; align-items: center;
}

/* Photo */
.photo-ring {
    position: relative; width: 268px; height: 268px; margin: 0 auto;
}
.photo-ring::before {
    content: ''; position: absolute; inset: -3px; border-radius: 50%;
    background: linear-gradient(135deg, var(--blue), var(--green), var(--blue));
    background-size: 300% 300%;
    animation: spinGrad 5s linear infinite; z-index: 0;
}
.photo-ring::after {
    content: ''; position: absolute; inset: -3px; border-radius: 50%;
    background: linear-gradient(135deg, var(--blue), var(--green));
    filter: blur(14px); opacity: .45; z-index: -1;
}
@keyframes spinGrad {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
.photo-inner {
    position: relative; width: 100%; height: 100%; border-radius: 50%;
    overflow: hidden; border: 3px solid var(--bg); z-index: 1;
    background: var(--bg2);
}
.photo-inner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 1; }
.photo-placeholder {
    width: 100%; height: 100%; display: flex; flex-direction: column;
    align-items: center; justify-content: center; color: var(--text3);
    font-size: .72rem; text-align: center; gap: 8px; padding: 20px;
}
.photo-placeholder svg { opacity: .3; }

.avail-badge {
    position: absolute; bottom: 8px; right: -14px;
    display: flex; align-items: center; gap: 6px;
    padding: 6px 13px; background: var(--bg2);
    border: 1px solid var(--border); border-radius: 100px;
    font-size: .7rem; font-weight: 600; color: var(--green-l);
    backdrop-filter: blur(10px); z-index: 3; white-space: nowrap;
}

/* Dot animations */
.dot-pulse {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--green); position: relative; flex-shrink: 0;
}
.dot-pulse::after {
    content: ''; position: absolute; inset: -4px; border-radius: 50%;
    background: var(--green); opacity: .3;
    animation: pulsate 2.2s ease-in-out infinite;
}
@keyframes pulsate {
    0%,100% { transform: scale(1); opacity: .3; }
    50%      { transform: scale(2); opacity: 0; }
}
.dot-live {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--green); position: relative; flex-shrink: 0;
}
.dot-live::after {
    content: ''; position: absolute; inset: -4px; border-radius: 50%;
    background: var(--green); opacity: .3;
    animation: pulsate 2s ease-in-out infinite;
}

/* Hero text */
.hero-body { display: flex; flex-direction: column; gap: 18px; }
.hero-avail {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 14px; width: fit-content;
    background: rgba(16,185,129,.08); border: 1px solid rgba(16,185,129,.2);
    border-radius: 100px; font-size: .76rem; font-weight: 500; color: var(--green-l);
}
.hero-h1 { font-size: clamp(2.6rem, 5.5vw, 4.2rem); font-weight: 900; letter-spacing: -.04em; line-height: 1.1; }
.grad-text {
    background: linear-gradient(135deg, var(--blue-l), var(--green-l));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-sub  { font-size: 1.05rem; font-weight: 500; color: var(--text2); }
.hero-desc { font-size: .97rem; color: var(--text3); line-height: 1.75; max-width: 510px; }
.hero-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.hero-socials { display: flex; gap: 8px; }

/* ================================================
   SECTION 2 — INTRODUCTION (BENTO)
================================================ */
.intro-bento {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 14px;
}
.intro-photo {
    grid-row: 1 / 3; overflow: hidden; padding: 0;
    min-height: 420px; position: relative;
}
.intro-photo img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.intro-photo:hover img { transform: scale(1.04); }
.intro-photo-overlay {
    position: absolute; bottom: 0; left: 0; right: 0;
    padding: 24px 22px;
    background: linear-gradient(to top, rgba(3,7,18,.95) 50%, transparent);
}
.intro-bio {
    padding: 30px 28px; display: flex; flex-direction: column;
    justify-content: center; gap: 14px;
}
.intro-bio h3 { font-size: 1.25rem; font-weight: 700; color: var(--text); line-height: 1.3; }
.intro-bio p  { font-size: .92rem; color: var(--text2); line-height: 1.75; }
.intro-bio .skills { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }

.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat-card { padding: 20px 16px; text-align: center; }
.stat-n {
    font-size: 2rem; font-weight: 900; letter-spacing: -.05em; display: block;
    background: linear-gradient(135deg, var(--blue-l), var(--green-l));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-l { font-size: .72rem; color: var(--text3); font-weight: 500; margin-top: 4px; display: block; }

.intro-photo-placeholder {
    width: 100%; height: 100%; min-height: 420px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, rgba(29,78,216,.08), rgba(16,185,129,.04));
    color: var(--text3); flex-direction: column; gap: 10px;
}
.intro-photo-placeholder svg { opacity: .3; }
.intro-photo-placeholder p   { font-size: .76rem; }

/* ================================================
   SECTION 3 — CURRENT PULSE
================================================ */
#pulse { padding: 64px 0; }
.pulse-section-bg {
    background: linear-gradient(180deg, transparent, rgba(15,23,42,.35), transparent);
}
.pulse-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 32px; gap: 16px; }
.pulse-live { display: flex; align-items: center; gap: 10px; }
.pulse-h2   { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; letter-spacing: -.03em; margin-top: 6px; }
.pulse-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 14px; }

.pulse-card { padding: 24px; transition: all .3s; }
.pulse-card:hover { transform: translateY(-3px); box-shadow: 0 0 28px rgba(59,130,246,.14); border-color: var(--border-blue); }
.pc-top   { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.pc-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-top: 6px; }
.pc-desc  { font-size: .85rem; color: var(--text3); line-height: 1.65; margin-bottom: 18px; }
.pc-emoji { font-size: 1.6rem; flex-shrink: 0; }
.tech-row { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 18px; }
.tech-tag {
    padding: 3px 9px; border-radius: 4px; font-size: .67rem; font-weight: 600;
    font-family: 'SF Mono', 'Cascadia Code', 'Fira Code', monospace;
    background: rgba(255,255,255,.05); color: var(--text3); border: 1px solid var(--border);
}

/* Progress bar */
.prog-wrap  { display: flex; flex-direction: column; gap: 7px; }
.prog-info  { display: flex; justify-content: space-between; align-items: center; }
.prog-label { font-size: .73rem; font-weight: 500; color: var(--text2); }
.prog-pct   { font-size: .73rem; font-weight: 800; color: var(--blue-l); }
.prog-track { height: 5px; background: rgba(255,255,255,.06); border-radius: 100px; overflow: hidden; }
.prog-fill {
    height: 100%; border-radius: 100px; width: 0%;
    background: linear-gradient(90deg, var(--blue-d), var(--blue), var(--green));
    background-size: 200% 100%;
    animation: shimmer 2.5s ease-in-out infinite;
    transition: width 1.4s cubic-bezier(.4,0,.2,1);
}
@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ================================================
   SECTION 4 — RESEARCH LAB
================================================ */
.section-header { margin-bottom: 44px; }
.section-header h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 900; letter-spacing: -.04em; margin-bottom: 10px; }
.section-header p  { font-size: .97rem; color: var(--text2); }

.research-list { display: flex; flex-direction: column; gap: 10px; }
.research-item {
    padding: 22px 26px; display: grid;
    grid-template-columns: 1fr auto; gap: 20px; align-items: center;
    transition: all .3s;
}
.research-item:hover { border-color: var(--border-blue); background: rgba(59,130,246,.03); transform: translateX(5px); }
.r-title    { font-size: .97rem; font-weight: 700; color: var(--text); line-height: 1.4; margin-bottom: 6px; }
.r-abstract { font-size: .84rem; color: var(--text3); line-height: 1.55; margin-bottom: 10px; }
.r-meta     { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; }
.journal-tag {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 10px; border-radius: 100px; font-size: .68rem; font-weight: 600;
    background: rgba(168,85,247,.1); color: #c084fc; border: 1px solid rgba(168,85,247,.2);
}
.doi-btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 15px; border-radius: var(--r-sm);
    background: rgba(59,130,246,.08); border: 1px solid rgba(59,130,246,.2);
    font-size: .73rem; font-weight: 700; color: var(--blue-l);
    transition: all .2s; white-space: nowrap; flex-shrink: 0;
}
.doi-btn:hover { background: rgba(59,130,246,.16); border-color: var(--blue); }
.doi-soon { opacity: .45; cursor: default; }

/* ================================================
   SECTION 5 — PROJECT GALLERY (BENTO)
================================================ */
.proj-bento {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
}
.proj-card {
    padding: 26px; display: flex; flex-direction: column; gap: 14px;
    transition: all .3s; position: relative; overflow: hidden;
}
.proj-card::after {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--blue), var(--green));
    opacity: 0; transition: opacity .3s;
}
.proj-card:hover          { transform: translateY(-4px); box-shadow: 0 0 32px rgba(59,130,246,.14); border-color: var(--border-blue); }
.proj-card:hover::after   { opacity: 1; }
.proj-card.featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(29,78,216,.08), var(--card));
    border-color: rgba(59,130,246,.18);
}
.proj-icon {
    width: 44px; height: 44px; border-radius: var(--r-md);
    display: flex; align-items: center; justify-content: center; font-size: 1.35rem;
    background: rgba(59,130,246,.1); border: 1px solid rgba(59,130,246,.2);
    flex-shrink: 0;
}
.proj-title { font-size: 1.02rem; font-weight: 700; color: var(--text); }
.proj-desc  { font-size: .86rem; color: var(--text3); line-height: 1.65; flex: 1; }
.proj-footer {
    display: flex; align-items: center; justify-content: space-between;
    margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border);
}
.gh-link {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: .8rem; font-weight: 600; color: var(--text3);
    transition: color .2s;
}
.gh-link:hover { color: var(--blue-l); }

/* ================================================
   SECTION 6 — TIMELINE
================================================ */
.tl-wrap { position: relative; max-width: 700px; margin: 0 auto; }
.tl-line {
    position: absolute; left: 136px; top: 0; bottom: 0; width: 1px;
    background: linear-gradient(to bottom, transparent, var(--border) 8%, var(--border) 92%, transparent);
}
.tl-items { display: flex; flex-direction: column; }
.tl-item  { display: grid; grid-template-columns: 136px 1fr; gap: 36px; padding: 18px 0; position: relative; }
.tl-item:first-child { padding-top: 0; }

.tl-year { text-align: right; padding-right: 18px; }
.tl-y    { font-size: .82rem; font-weight: 800; color: var(--blue-l); }
.tl-s    { font-size: .68rem; color: var(--text3); margin-top: 2px; }

.tl-dot {
    position: absolute; left: 136px; top: 20px;
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--blue); transform: translateX(-50%);
    border: 2px solid var(--bg); box-shadow: 0 0 0 3px rgba(59,130,246,.18);
}
.tl-item.now .tl-dot {
    background: var(--green); box-shadow: 0 0 0 3px rgba(16,185,129,.18);
    animation: pulsate 2.2s ease-in-out infinite;
}

.tl-content { padding-left: 18px; }
.tl-title   { font-size: .94rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.tl-desc    { font-size: .83rem; color: var(--text3); line-height: 1.6; }
.tl-tag {
    display: inline-block; margin-top: 8px;
    padding: 3px 8px; border-radius: 4px;
    font-size: .67rem; font-weight: 700;
    background: rgba(59,130,246,.1); color: var(--blue-l);
    border: 1px solid rgba(59,130,246,.15);
}

/* ================================================
   FOOTER
================================================ */
footer { border-top: 1px solid var(--border); padding: 56px 0 36px; position: relative; z-index: 1; }
.footer-grid     { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: start; margin-bottom: 36px; }
.footer-logo     { font-size: 1.2rem; font-weight: 900; letter-spacing: -.04em; background: linear-gradient(135deg, #fff, var(--blue-l)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.footer-tagline  { font-size: .87rem; color: var(--text3); max-width: 280px; margin: 10px 0; }
.footer-tags     { display: flex; gap: 5px; flex-wrap: wrap; }
.footer-contacts { display: flex; flex-direction: column; gap: 11px; align-items: flex-end; }
.contact-link    { display: flex; align-items: center; gap: 8px; font-size: .84rem; color: var(--text2); transition: color .2s; }
.contact-link:hover { color: var(--blue-l); }
.footer-bottom {
    display: flex; align-items: center; justify-content: space-between;
    padding-top: 22px; border-top: 1px solid var(--border);
}
.copy          { font-size: .76rem; color: var(--text3); }
.footer-socials { display: flex; gap: 7px; }

/* ================================================
   SCROLL ANIMATIONS
================================================ */
.fade-up { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
.fade-up.in { opacity: 1; transform: translateY(0); }
.fade-up:nth-child(2) { transition-delay: 80ms; }
.fade-up:nth-child(3) { transition-delay: 160ms; }
.fade-up:nth-child(4) { transition-delay: 240ms; }
.fade-up:nth-child(5) { transition-delay: 320ms; }

/* ================================================
   RESPONSIVE
================================================ */
@media (max-width: 1024px) {
    .proj-bento { grid-template-columns: repeat(2, 1fr); }
    .proj-card.featured { grid-column: span 2; }
}

@media (max-width: 768px) {
    :root { --pad-section: 60px; }
    .hero-grid     { grid-template-columns: 1fr; gap: 32px; text-align: center; }
    .photo-ring    { width: 210px; height: 210px; }
    .hero-avail,
    .hero-actions  { margin: 0 auto; }
    .hero-actions  { justify-content: center; }
    .hero-socials  { justify-content: center; }
    .hero-desc     { margin: 0 auto; }
    .nav-links     { display: none; }
    .hamburger     { display: flex; }
    .intro-bento   { grid-template-columns: 1fr; }
    .intro-photo   { grid-row: auto; min-height: 300px; }
    .stats-row     { grid-template-columns: repeat(3,1fr); gap: 8px; }
    .proj-bento    { grid-template-columns: 1fr; }
    .proj-card.featured { grid-column: span 1; }
    .research-item { grid-template-columns: 1fr; }
    .tl-line       { left: 80px; }
    .tl-item       { grid-template-columns: 80px 1fr; gap: 20px; }
    .tl-dot        { left: 80px; }
    .footer-grid   { grid-template-columns: 1fr; }
    .footer-contacts { align-items: flex-start; }
    .footer-bottom { flex-direction: column; gap: 14px; align-items: flex-start; }
}

@media (max-width: 480px) {
    .stats-row  { grid-template-columns: 1fr 1fr; }
    .pulse-grid { grid-template-columns: 1fr; }
}