/* ========== Theme Variables ========== */
:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --text: #1a1a2e;
  --text-secondary: #555770;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-tint: rgba(37, 99, 235, 0.08);
  --border: #e5e7eb;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06);
  --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
  --nav-bg: rgba(255,255,255,0.9);
  --code-bg: #f1f5f9;
}

:root[data-theme="dark"] {
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-tint: rgba(96, 165, 250, 0.1);
  --border: #334155;
  --card-bg: #1e293b;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.2);
  --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.4);
  --nav-bg: rgba(15,23,42,0.9);
  --code-bg: #1e293b;
}

/* ========== Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

::selection { background: var(--accent); color: #fff; }

/* ========== Navbar ========== */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: box-shadow 0.3s, background 0.3s;
}

#navbar.scrolled { box-shadow: 0 1px 8px rgba(0,0,0,0.08); }

.nav-inner {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--accent-hover); }

.nav-right { display: flex; align-items: center; gap: 0.5rem; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
}

.nav-links a {
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 400;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}
.nav-links a:hover { background: var(--accent-tint); color: var(--accent); }

.nav-resume-btn {
  border: 1px solid var(--accent) !important;
  color: var(--accent) !important;
  border-radius: 6px !important;
  padding: 0.4rem 1rem !important;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem !important;
}
.nav-resume-btn:hover { background: var(--accent-tint) !important; }

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px; height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: background 0.2s, border-color 0.2s;
}
.theme-toggle:hover { background: var(--accent-tint); border-color: var(--accent); color: var(--accent); }

/* Hamburger */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========== Main Content ========== */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 3.5rem 0 1.5rem;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
section.visible { opacity: 1; transform: translateY(0); }

/* ========== Hero ========== */
#hero { padding-top: 8rem; min-height: 85vh; display: flex; flex-direction: column; justify-content: center; }

.hero-greeting {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.hero-tagline {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.hero-bio {
  max-width: 520px;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-links { display: flex; gap: 1.25rem; }
.hero-links a {
  color: var(--text-secondary);
  font-size: 1.35rem;
  transition: color 0.2s, transform 0.2s;
}
.hero-links a:hover { color: var(--accent); transform: translateY(-2px); }

/* ========== Section Titles ========== */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.section-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
}

/* ========== About ========== */
.about-grid { display: grid; grid-template-columns: 3fr 2fr; gap: 3rem; align-items: start; }

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.7;
}

.photo-wrapper {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}
.photo-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent);
  border-radius: 8px;
  opacity: 0;
  transition: opacity 0.3s;
}
.photo-wrapper:hover::after { opacity: 1; }
.photo-wrapper img {
  width: 100%;
  display: block;
  border-radius: 8px;
  filter: grayscale(20%);
  transition: filter 0.3s;
}
.photo-wrapper:hover img { filter: grayscale(0%); }

/* ========== Projects ========== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

#projects .project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s, background 0.3s;
  opacity: 0;
  transform: translateY(16px);
  display: flex;
  flex-direction: column;
}
#projects .project-card.visible { opacity: 1; transform: translateY(0); }
#projects .project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--accent);
}

.project-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
.project-icon { display: none; }
.project-links a { color: var(--text-secondary); font-size: 1rem; transition: color 0.2s; }
.project-links a:hover { color: var(--accent); }

.project-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.project-desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}
.project-tech li {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-tint);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

/* ========== Experience ========== */
.exp-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.exp-item:last-of-type { border-bottom: none; }

.exp-header { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.5rem; }
.exp-header h3 { font-size: 1rem; font-weight: 500; color: var(--text); }
.exp-at { color: var(--accent); font-weight: 500; }
.exp-date { font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; color: var(--text-secondary); white-space: nowrap; }
.exp-desc { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

.view-resume {
  display: inline-block;
  margin-top: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
}
.view-resume:hover { text-decoration: underline; }

/* ========== Skills ========== */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }

.skill-group h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.skill-group p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ========== Education ========== */
.edu-item { margin-bottom: 1.25rem; }
.edu-item h3 { font-size: 1rem; font-weight: 500; color: var(--text); margin-bottom: 0.2rem; }
.edu-item p { color: var(--text-secondary); font-size: 0.9rem; }

/* ========== Contact ========== */
#contact { text-align: center; padding: 4rem 0; }
.contact-heading { font-size: 2rem; font-weight: 700; margin-bottom: 1rem; }
.contact-text { color: var(--text-secondary); max-width: 480px; margin: 0 auto 2rem; font-size: 0.95rem; line-height: 1.7; }
.contact-btn {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 0.75rem 2rem;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  transition: background 0.2s;
}
.contact-btn:hover { background: var(--accent-tint); }

/* ========== Footer ========== */
footer {
  text-align: center;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--border);
}
.footer-links { display: flex; justify-content: center; gap: 1.25rem; margin-bottom: 1rem; }
.footer-links a { color: var(--text-secondary); font-size: 1.1rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
footer p { font-size: 0.8rem; color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-links { display: none; position: fixed; top: 64px; left: 0; right: 0; background: var(--bg); flex-direction: column; padding: 1.5rem; border-bottom: 1px solid var(--border); gap: 0.25rem; }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .about-grid { grid-template-columns: 1fr; }
  .about-photo { order: -1; max-width: 200px; margin: 0 auto; }
  #hero { min-height: 70vh; padding-top: 6rem; }
  section { padding: 3.5rem 0 1.5rem; }
  .exp-header { flex-direction: column; gap: 0.2rem; }
  .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  main { padding: 0 1rem; }
  #navbar { padding: 0 1rem; }
  .skills-grid { grid-template-columns: 1fr 1fr; }
}