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

:root {
  --blue-900: #0f172a;
  --blue-800: #1e293b;
  --blue-700: #334155;
  --accent:   #60a5fa;
  --accent-glow: rgba(96,165,250,0.25);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: rgba(255,255,255,0.07);
  --card-bg: #1e293b;
  --card-bg-alt: #253347;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--blue-900);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: #93c5fd; }
img { max-width: 100%; display: block; }

/* ===== Navbar ===== */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: transparent; transition: background .3s, box-shadow .3s;
}
#navbar.scrolled {
  background: rgba(15,23,42,0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 2px 24px rgba(0,0,0,0.3);
}
.nav-inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px;
}
.nav-brand {
  font-weight: 800; font-size: 1.3rem; color: var(--accent) !important;
  letter-spacing: -1px;
}
.nav-links { list-style: none; display: flex; gap: 28px; }
.nav-links a { color: var(--text-secondary); font-weight: 500; font-size: .95rem; }
.nav-links a:hover { color: var(--accent); }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  width: 24px; height: 2px; background: var(--text-primary);
  transition: transform .3s, opacity .3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
#hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; position: relative;
  background:
    radial-gradient(ellipse 70% 50% at 50% 40%, rgba(96,165,250,0.06) 0%, transparent 70%),
    var(--blue-900);
  padding: 120px 24px 80px;
}
.hero-content { max-width: 680px; position: relative; z-index: 1; }
.hero-greeting {
  font-size: 1.1rem; color: var(--accent); font-weight: 500; margin-bottom: 8px;
}
#hero h1 {
  font-size: clamp(2.6rem, 6vw, 4rem); font-weight: 800; line-height: 1.1;
  margin-bottom: 8px;
  background: linear-gradient(135deg, #f1f5f9 30%, #60a5fa 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-role {
  font-size: 1.25rem; color: var(--text-secondary); font-weight: 500; margin-bottom: 20px;
}
.hero-sub {
  font-size: 1.05rem; color: var(--text-secondary); max-width: 600px;
  margin: 0 auto 16px;
}
.hero-sub-secondary {
  font-size: .95rem; color: var(--accent); font-weight: 500;
  margin-bottom: 28px;
}
.hero-buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 28px; }

.btn {
  display: inline-block; padding: 11px 24px; border-radius: 8px;
  font-weight: 600; font-size: .92rem; transition: transform .15s, box-shadow .2s;
  cursor: pointer; border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: var(--accent); color: var(--blue-900);
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 6px 24px var(--accent-glow); color: var(--blue-900); }
.btn-outline { border: 1.5px solid var(--text-secondary); color: var(--text-secondary); background: transparent; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 8px 18px; font-size: .85rem; }

.hero-social { display: flex; gap: 18px; justify-content: center; }
.hero-social a {
  color: var(--text-secondary); transition: color .2s, transform .2s;
}
.hero-social a:hover { color: var(--accent); transform: translateY(-2px); }

.hero-fade {
  position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
  background: linear-gradient(transparent, var(--blue-900));
}

/* ===== Sections ===== */
section { padding: 90px 0; }
section:nth-child(even) { background: var(--card-bg); }
.section-title {
  text-align: center; font-size: 2rem; font-weight: 800; margin-bottom: 8px;
}
.section-subtitle {
  text-align: center; color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 48px;
}

/* ===== About ===== */
.about-content {
  display: grid; grid-template-columns: 2fr 1fr; gap: 48px; align-items: start;
}
.about-text p { color: var(--text-secondary); margin-bottom: 16px; }
.about-text strong { color: var(--text-primary); }

.about-stats { display: flex; flex-direction: column; gap: 20px; }
.stat {
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; text-align: center;
}
.stat-number { display: block; font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: .85rem; color: var(--text-secondary); }

/* ===== Education ===== */
.education-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px;
  margin-top: 40px;
}
.education-card {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: transform .2s, box-shadow .2s;
}
.education-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.education-icon { color: var(--accent); flex-shrink: 0; margin-top: 2px; }
.education-details h3 { font-size: 1.15rem; margin-bottom: 4px; }
.education-field {
  color: var(--accent); font-weight: 600; font-size: .95rem; margin-bottom: 4px;
}
.education-school {
  color: var(--text-secondary); font-size: .92rem; margin-bottom: 8px;
}
.education-meta {
  display: inline-block; font-size: .85rem; color: var(--text-secondary);
  background: rgba(96,165,250,0.08); padding: 4px 12px; border-radius: 20px;
  margin-bottom: 10px;
}
.education-coursework {
  font-size: .88rem; color: var(--text-secondary); margin-top: 4px;
}
.education-awards {
  font-size: .88rem; color: var(--accent); font-weight: 500; margin-top: 4px;
}

/* ===== Projects ===== */
.project-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px;
}
.project-card {
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: transform .2s, box-shadow .2s; position: relative;
}
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.project-card.featured { border-color: rgba(96,165,250,0.3); grid-column: 1 / -1; }
.project-card.featured .project-body { padding: 28px 32px; }
.project-card.featured .project-img img { max-height: 280px; object-fit: cover; width: 100%; }

.project-badge {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  background: var(--accent); color: var(--blue-900);
  font-weight: 700; font-size: .75rem; padding: 4px 12px;
  border-radius: 6px; text-transform: uppercase; letter-spacing: .5px;
}
.project-badge.competition-badge {
  background: linear-gradient(135deg, #f59e0b, #f97316);
}
.project-img { background: var(--blue-800); min-height: 180px; overflow: hidden; }
.project-img img { width: 100%; height: 200px; object-fit: cover; }
.placeholder-img {
  display: flex; align-items: center; justify-content: center; min-height: 200px;
}
.placeholder-icon { color: var(--text-secondary); opacity: .3; }

.project-body { padding: 24px; }
.project-body h3 { font-size: 1.15rem; margin-bottom: 10px; }
.project-body p { color: var(--text-secondary); font-size: .92rem; margin-bottom: 14px; }
.project-body .project-problem { color: var(--text-primary); font-size: .92rem; margin-bottom: 10px; }
.project-section-label {
  font-size: .82rem; text-transform: uppercase; letter-spacing: .8px;
  color: var(--accent); margin: 18px 0 8px; font-weight: 700;
}
.project-body .project-result { color: var(--text-primary); font-size: .92rem; margin-bottom: 8px; }
.project-body .project-impact { color: var(--accent); font-size: .9rem; font-weight: 500; margin-bottom: 16px; }
.project-approach {
  list-style: none; padding: 0; margin: 0 0 14px;
}
.project-approach li {
  position: relative; padding-left: 18px;
  color: var(--text-secondary); font-size: .9rem; margin-bottom: 6px; line-height: 1.5;
}
.project-approach li::before {
  content: '\2022'; position: absolute; left: 0; color: var(--accent); font-weight: 700;
}
.project-approach li strong { color: var(--text-primary); font-weight: 700; }
.project-card:not(.featured) .project-body > .project-section-label:first-of-type { margin-top: 14px; }

.project-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.project-tags span {
  background: rgba(96,165,250,0.1); color: var(--accent);
  padding: 4px 12px; border-radius: 20px; font-size: .8rem; font-weight: 500;
}
.project-links { display: flex; gap: 10px; flex-wrap: wrap; }

/* ===== Approach ===== */
.approach-steps {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
  counter-reset: step;
}
.approach-step {
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px 20px; text-align: center;
  position: relative;
  transition: transform .2s, box-shadow .2s;
}
.approach-step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step-number {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent); color: var(--blue-900);
  font-weight: 800; font-size: 1.1rem; margin-bottom: 14px;
}
.approach-step h3 { font-size: .98rem; margin-bottom: 10px; }
.approach-step p { color: var(--text-secondary); font-size: .88rem; line-height: 1.55; }

/* ===== Skills ===== */
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px;
}
.skill-group {
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
}
.skill-group h3 { font-size: 1rem; margin-bottom: 16px; color: var(--accent); font-weight: 600; }
.skill-pills { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-pills span {
  background: rgba(96,165,250,0.08); border: 1px solid rgba(96,165,250,0.15);
  color: var(--text-primary); padding: 6px 14px; border-radius: 20px;
  font-size: .88rem; font-weight: 500;
}

/* ===== Experience ===== */
.timeline { max-width: 640px; margin: 0 auto; position: relative; padding-left: 32px; }
.timeline::before {
  content: ''; position: absolute; left: 8px; top: 0; bottom: 0;
  width: 2px; background: var(--border);
}
.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-dot {
  position: absolute; left: -28px; top: 6px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--blue-900);
}
.timeline-date {
  font-size: .85rem; color: var(--accent); font-weight: 600; display: block; margin-bottom: 4px;
}
.timeline-content h3 { font-size: 1.1rem; margin-bottom: 8px; }
.timeline-content p { color: var(--text-secondary); font-size: .94rem; }

/* ===== Contact ===== */
.contact-links {
  display: flex; flex-wrap: wrap; gap: 20px; justify-content: center;
}
.contact-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--card-bg-alt); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 28px;
  color: var(--text-secondary); transition: border-color .2s, transform .2s;
}
.contact-card:hover {
  border-color: var(--accent); transform: translateY(-2px);
  color: var(--text-primary);
}

/* ===== Footer ===== */
footer {
  background: var(--blue-800); padding: 32px 0; text-align: center;
  border-top: 1px solid var(--border);
}
.footer-inner p { color: var(--text-secondary); font-size: .88rem; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    position: fixed; top: 0; right: -100%; width: 260px; height: 100vh;
    background: var(--blue-900); flex-direction: column;
    padding: 80px 32px 32px; gap: 24px;
    transition: right .3s; box-shadow: -4px 0 20px rgba(0,0,0,.4);
  }
  .nav-links.open { right: 0; }
  .about-content { grid-template-columns: 1fr; }
  .about-stats { flex-direction: row; flex-wrap: wrap; }
  .stat { flex: 1; min-width: 120px; }
  .project-card.featured { grid-column: auto; }
  .approach-steps { grid-template-columns: 1fr; }
  #hero h1 { font-size: 2.4rem; }
}