/* ============================================================
   SARDER JUNAID AHMED — Portfolio
   Dark Futuristic · Glassmorphism · Space Grotesk
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────── */
:root {
  --bg:          #050810;
  --bg-2:        #090d1a;
  --bg-3:        #0d1120;
  --glass:       rgba(255, 255, 255, 0.04);
  --glass-border:rgba(255, 255, 255, 0.08);
  --glass-hover: rgba(255, 255, 255, 0.07);

  --accent:      #00e5ff;
  --accent-dim:  rgba(0, 229, 255, 0.15);
  --accent-glow: rgba(0, 229, 255, 0.35);
  --accent-2:    #7c3aed;

  --text:        #e8eaf0;
  --text-muted:  #7a8099;
  --text-dim:    #4a5270;

  --award:       #f59e0b;
  --accepted:    #22c55e;
  --review:      #60a5fa;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --radius:      12px;
  --radius-lg:   20px;
  --transition:  0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; }

/* ── UTILITIES ───────────────────────────────────────────── */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.mono { font-family: var(--font-mono); font-size: 0.85em; }
.accent { color: var(--accent); }
.dot { color: var(--accent); }

.glass {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
}

.glass:hover {
  background: var(--glass-hover);
  border-color: rgba(0, 229, 255, 0.15);
  transition: var(--transition);
}

section {
  padding: 100px 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
  opacity: 0.8;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

/* ── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #050810;
  box-shadow: 0 0 24px var(--accent-glow);
}

.btn-primary:hover {
  background: #33ecff;
  box-shadow: 0 0 40px var(--accent-glow);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--glass-border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.8rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: inline-block;
}

.full-width { width: 100%; justify-content: center; }

/* ── NAVBAR ──────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: rgba(5, 8, 16, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

#navbar.scrolled {
  border-bottom-color: var(--glass-border);
  padding: 14px 40px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 8px 18px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 16px var(--accent-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── HERO ────────────────────────────────────────────────── */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  text-align: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black, transparent);
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.25;
}

.glow-1 {
  width: 600px; height: 600px;
  top: -200px; left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--accent), transparent 70%);
}

.glow-2 {
  width: 400px; height: 400px;
  bottom: -100px; right: 10%;
  background: radial-gradient(circle, var(--accent-2), transparent 70%);
  opacity: 0.2;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero-photo-wrap {
    margin: 0 auto 30px;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--accent);
    box-shadow: 0 0 40px var(--accent-glow), 0 0 80px rgba(0, 229, 255, 0.15);
    flex-shrink: 0;
    transition: var(--transition);
} 

.hero-photo-wrap:hover {
    transform: scale(1.02);
    box-shadow: 0 0 60px var(--accent-glow), 0 0 120px rgba(0, 229, 255, 0.2);
}

.hero-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0.9;
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 9vw, 7rem);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.75;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-bottom: 44px;
  flex-wrap: wrap;
  row-gap: 16px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 28px;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: var(--font-mono);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--glass-border);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* ── ABOUT ───────────────────────────────────────────────── */
#about { background: var(--bg-2); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.about-text strong { color: var(--text); }

.about-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 6px 14px;
  background: var(--accent-dim);
  border: 1px solid rgba(0,229,255,0.2);
  border-radius: 100px;
  color: var(--accent);
}

.about-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.about-card-row { padding: 20px 0; }
.about-card-row:first-child { padding-top: 0; }
.about-card-row:last-child { padding-bottom: 0; }

.about-card-divider {
  height: 1px;
  background: var(--glass-border);
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 12px;
}

.focus-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.focus-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-left: 12px;
  position: relative;
}

.focus-list li::before {
  content: '▸';
  color: var(--accent);
  position: absolute;
  left: 0;
  font-size: 0.7rem;
  top: 3px;
}

.currently-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.link-chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 5px 12px;
  border: 1px solid var(--glass-border);
  border-radius: 6px;
  color: var(--text-muted);
  transition: var(--transition);
}

.link-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── SKILLS ──────────────────────────────────────────────── */
#skills { background: var(--bg); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.skill-card {
  padding: 28px;
  transition: var(--transition);
  cursor: default;
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,229,255,0.1);
}

.skill-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  background: rgba(0,229,255,0.06);
  border: 1px solid rgba(0,229,255,0.12);
  border-radius: 6px;
  color: var(--text-muted);
}

/* ── PROJECTS ────────────────────────────────────────────── */
#projects { background: var(--bg-2); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

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

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,229,255,0.12);
}

.project-card.featured {
  background: rgba(0,229,255,0.03);
  border-color: rgba(0,229,255,0.12);
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.8;
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.project-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: -8px;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 3px 10px;
  background: rgba(124,58,237,0.12);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: 5px;
  color: #a78bfa;
}

.project-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.metric {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  background: rgba(0,229,255,0.07);
  border: 1px solid rgba(0,229,255,0.15);
  border-radius: 6px;
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

/* ── RESEARCH ────────────────────────────────────────────── */
#research { background: var(--bg); }

.research-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.research-card {
  padding: 28px 32px;
  transition: var(--transition);
}

.research-card:hover {
  transform: translateX(4px);
  border-color: rgba(0,229,255,0.2);
}

.research-card.award {
  border-color: rgba(245,158,11,0.3);
  background: rgba(245,158,11,0.04);
}

.research-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
}

.award-badge {
  background: rgba(245,158,11,0.12);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--award);
}

.accepted {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--accepted);
}

.under-review {
  background: rgba(96,165,250,0.1);
  border: 1px solid rgba(96,165,250,0.25);
  color: var(--review);
}

.research-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.45;
}

.research-venue {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  line-height: 1.5;
}

.research-authors {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ── CV ──────────────────────────────────────────────────── */
#cv { background: var(--bg-2); }

.cv-block {
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cv-text p {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 420px;
  margin-top: 8px;
}

.cv-text .section-title { margin-bottom: 0; }

.cv-buttons {
  display: flex;
  gap: 16px;
  flex-shrink: 0;
}

.cv-btn {
  flex-direction: row;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  min-width: 200px;
}

.cv-btn-icon { font-size: 1.4rem; }

.cv-btn span:last-child {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}

.cv-btn strong { font-size: 0.9rem; }
.cv-btn small { font-size: 0.72rem; opacity: 0.7; font-weight: 400; }

/* ── CONTACT ─────────────────────────────────────────────── */
#contact { background: var(--bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-text p {
  color: var(--text-muted);
  margin-bottom: 28px;
  font-size: 1rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-radius: var(--radius);
  transition: var(--transition);
}

a.contact-item:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.contact-item.no-link { cursor: default; }

.contact-icon { font-size: 1.3rem; flex-shrink: 0; }

.contact-item div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.contact-item strong {
  font-size: 0.85rem;
  font-family: var(--font-display);
  color: var(--text);
}

.contact-item span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.contact-form {
  padding: 32px;
}

.contact-form h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: var(--transition);
  resize: vertical;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(0,229,255,0.03);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-dim);
}

.form-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accepted);
  margin-top: 12px;
  text-align: center;
  min-height: 20px;
}

/* ── FOOTER ──────────────────────────────────────────────── */
footer {
  padding: 32px 0;
  border-top: 1px solid var(--glass-border);
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

footer p {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--accent); }

/* ── SCROLL ANIMATIONS ───────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .skills-grid { grid-template-columns: repeat(2, 1fr); }

  .projects-grid { grid-template-columns: 1fr; }

  .cv-block {
    flex-direction: column;
    align-items: flex-start;
    padding: 32px;
  }

  .cv-buttons { flex-direction: column; width: 100%; }
  .cv-btn { min-width: 0; width: 100%; }
}

@media (max-width: 680px) {
  #navbar { padding: 16px 20px; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(5,8,16,0.97);
    align-items: center;
    justify-content: center;
    gap: 32px;
    z-index: 99;
  }
  .nav-links.open a { font-size: 1.4rem; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; z-index: 101; }

  .skills-grid { grid-template-columns: 1fr; }

  .hero-stats { gap: 8px; }
  .stat { padding: 0 16px; }
  .stat-num { font-size: 1.4rem; }

  section { padding: 70px 0; }

  .research-card { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}