/* ===========================
   RESET & BASE
   =========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --bg-alt: #111118;
  --surface: #16161f;
  --surface-hover: #1e1e2a;
  --border: rgba(255,255,255,0.08);
  --text: #e8e8f0;
  --text-muted: #8888a8;
  --accent: #6c63ff;
  --accent-light: #8b85ff;
  --accent-glow: rgba(108,99,255,0.25);
  --white: #ffffff;
  --radius: 14px;
  --transition: 0.25s ease;
}

[data-theme="light"] {
  --bg: #f5f5fa;
  --bg-alt: #ebebf5;
  --surface: #ffffff;
  --surface-hover: #f0f0fa;
  --border: rgba(0,0,0,0.08);
  --text: #111118;
  --text-muted: #555570;
  --accent: #5a52e8;
  --accent-light: #6c63ff;
  --accent-glow: rgba(90,82,232,0.15);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  overflow-x: hidden;
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; text-decoration: none; }

/* ===========================
   NAV
   =========================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .nav {
  background: rgba(245,245,250,0.85);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 68px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--white);
  letter-spacing: -0.3px;
  flex-shrink: 0;
}

[data-theme="light"] .logo { color: var(--text); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover { color: var(--text); }

/* BUTTONS */
.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

/* THEME TOGGLE */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 1rem;
  flex-shrink: 0;
  transition: background var(--transition);
}
.theme-toggle:hover { background: var(--surface-hover); }

[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

/* HAMBURGER */
.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text);
  cursor: pointer;
  margin-left: auto;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.mobile-menu a {
  padding: 14px 24px;
  font-size: 1rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}

.mobile-menu a:hover { color: var(--text); }
.mobile-menu.open { display: flex; }

/* ===========================
   HERO
   =========================== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(108,99,255,0.12) 0%, transparent 70%),
              radial-gradient(ellipse 40% 40% at 80% 70%, rgba(108,99,255,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  padding-top: 80px;
  padding-bottom: 80px;
}

.hero-eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.hero-headline {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  color: var(--white);
}

[data-theme="light"] .hero-headline { color: var(--text); }

.accent { color: var(--accent-light); }

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-orb {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(108,99,255,0.22), rgba(108,99,255,0.04) 60%, transparent 80%);
  pointer-events: none;
  transition: transform 0.1s ease-out;
}

/* ===========================
   SECTIONS
   =========================== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 48px;
  line-height: 1.2;
}

/* ===========================
   ABOUT
   =========================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.profile-pic {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--accent);
  box-shadow: 0 0 32px var(--accent-glow);
  margin-bottom: 24px;
  display: block;
}

.about-text h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.8px;
  margin-bottom: 20px;
  line-height: 1.2;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1.02rem;
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.stat-number {
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

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

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px var(--accent-glow);
}

.skill-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.skill-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.skill-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===========================
   TECH TAGS
   =========================== */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 48px;
}

.tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: border-color var(--transition), color var(--transition);
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

/* ===========================
   TIMELINE
   =========================== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid var(--border);
  padding-left: 0;
  margin-left: 16px;
}

.timeline-item {
  display: flex;
  gap: 32px;
  padding-bottom: 48px;
  position: relative;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
  margin-left: -23px;
  margin-top: 6px;
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 6px var(--accent-glow);
}

.timeline-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  flex: 1;
  transition: border-color var(--transition);
}

.timeline-content:hover { border-color: var(--accent); }

.timeline-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}

.timeline-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.timeline-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--surface-hover);
  color: var(--text-muted);
  border: 1px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.timeline-badge.current {
  background: rgba(108,99,255,0.15);
  color: var(--accent-light);
  border-color: var(--accent);
}

.timeline-company {
  font-size: 0.88rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-content p {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===========================
   EDUCATION
   =========================== */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex;
  gap: 20px;
  transition: border-color var(--transition), transform var(--transition);
}

.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.edu-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.edu-details h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.edu-school {
  font-size: 0.88rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 2px;
}

.edu-years {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.edu-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===========================
   PUBLICATIONS
   =========================== */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.pub-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  gap: 32px;
  align-items: flex-start;
  transition: border-color var(--transition), transform var(--transition);
}

.pub-card:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.pub-year {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-light);
  background: rgba(108,99,255,0.12);
  border: 1px solid rgba(108,99,255,0.25);
  border-radius: 8px;
  padding: 6px 14px;
  flex-shrink: 0;
  letter-spacing: 0.5px;
  height: fit-content;
}

.pub-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
}

.pub-body p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.pub-link {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

.pub-link:hover {
  color: var(--accent-light);
}

/* ===========================
   BLOG
   =========================== */
.blog-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.blog-text p {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin-bottom: 24px;
}

.blog-topics {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}

.blog-topics li {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.blog-card {
  background: linear-gradient(135deg, rgba(108,99,255,0.15) 0%, rgba(108,99,255,0.04) 100%);
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius);
  padding: 48px 40px;
}

.blog-card-inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.blog-mission {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text);
  font-style: italic;
}

.blog-author {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-light);
}

.blog-cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ===========================
   CONTACT
   =========================== */
.contact-wrap {
  text-align: center;
}

.contact-sub {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  justify-items: center;
}

.contact-cards > .contact-card:last-child:nth-child(3n+1) {
  grid-column: 2;
  width: 100%;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
  cursor: pointer;
  width: 100%;
  min-height: 160px;
}

.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.contact-icon { font-size: 1.8rem; }

.contact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
  color: var(--text-muted);
}

.contact-value {
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
  word-break: break-all;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  background: var(--bg);
}

.footer-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
  flex: 1;
  text-align: center;
}

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

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 900px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .blog-feature { grid-template-columns: 1fr; gap: 36px; }
  .contact-cards { grid-template-columns: repeat(2, 1fr); }
  .edu-grid { grid-template-columns: 1fr; }
  .pub-card { flex-direction: column; gap: 16px; }
}

@media (max-width: 680px) {
  .nav-links { display: none; }
  .hamburger { display: block; }
  .theme-toggle { margin-left: 0; }
  .skills-grid { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr 1fr; }
  .hero-headline { font-size: 2.2rem; }
  .section { padding: 64px 0; }
  .timeline { margin-left: 8px; }
  .timeline-content { padding: 20px; }
}