/* ========== VARIABLES ========== */
:root {
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);

  /* Dark theme (default) */
  --bg: #0a0f1a;
  --bg-alt: #0f1724;
  --surface: #131c2e;
  --surface-hover: #1a2540;
  --border: #1f2a44;
  --text: #e6edf7;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --accent-glow: rgba(59, 130, 246, 0.08);
}

/* ========== RESET ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

/* ========== NAV ========== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}
.brand {
  font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em;
}
.brand-dot { color: var(--accent); }
.nav-links {
  display: flex; gap: 2rem;
}
.nav-links a {
  font-size: 0.9rem; color: var(--text-muted); font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--accent); }

.theme-toggle {
  background: transparent; border: 1px solid var(--border);
  color: var(--text); padding: 0.5rem; border-radius: 8px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative;
  padding: 6rem 0 4rem;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -20%; right: -10%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero .container { position: relative; z-index: 1; }
.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent); font-size: 0.9rem;
  margin-bottom: 1rem; font-weight: 500;
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800; letter-spacing: -0.03em; line-height: 1.05;
  margin-bottom: 0.5rem;
}
.accent { color: var(--accent); }
.hero-subtitle {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700; color: var(--text-muted);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}
.hero-subtitle .accent { color: var(--accent); }
.hero-desc {
  font-size: 1.1rem; color: var(--text-muted);
  max-width: 600px; margin-bottom: 2.5rem;
}
.hero-cta {
  display: flex; gap: 1rem; flex-wrap: wrap;
  margin-bottom: 2rem;
}
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem;
  transition: all 0.2s;
  cursor: pointer; border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent); color: white;
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); }
.btn-ghost {
  background: transparent; color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-links {
  display: flex; gap: 1rem;
}
.hero-links a {
  color: var(--text-muted);
  transition: color 0.2s, transform 0.2s;
  display: flex; align-items: center;
}
.hero-links a:hover { color: var(--accent); transform: translateY(-2px); }

/* ========== SECTIONS ========== */
.section { padding: 5rem 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 700; letter-spacing: -0.02em;
  margin-bottom: 3rem;
  display: flex; align-items: center; gap: 0.75rem;
}
.section-num {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent); font-size: 1rem; font-weight: 500;
}

/* ========== ABOUT ========== */
.about-grid {
  display: grid; grid-template-columns: 2fr 1fr; gap: 3rem;
  align-items: start;
}
.about-text p {
  color: var(--text-muted); margin-bottom: 1rem; font-size: 1.02rem;
}
.about-text strong { color: var(--text); font-weight: 600; }
.about-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
}
.stat {
  background: var(--surface); border: 1px solid var(--border);
  padding: 1.25rem; border-radius: 12px; text-align: center;
  transition: all 0.2s;
}
.stat:hover { border-color: var(--accent); transform: translateY(-2px); }
.stat-num {
  font-size: 1.75rem; font-weight: 800; color: var(--accent);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.8rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-top: 0.25rem;
}
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ========== TIMELINE ========== */
.timeline {
  position: relative; padding-left: 2rem;
}
.timeline::before {
  content: ''; position: absolute; left: 8px; top: 6px; bottom: 0;
  width: 2px; background: var(--border);
}
.timeline-item {
  position: relative; padding-bottom: 2.5rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute; left: -2rem; top: 6px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.timeline-dot-current {
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-glow);
}
.timeline-content {
  background: var(--surface); border: 1px solid var(--border);
  padding: 1.5rem; border-radius: 12px;
  transition: all 0.2s;
}
.timeline-content:hover { border-color: var(--accent); transform: translateX(4px); }
.timeline-header {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 1rem; margin-bottom: 0.25rem; flex-wrap: wrap;
}
.timeline-header h3 {
  font-size: 1.2rem; font-weight: 700;
}
.timeline-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem; color: var(--text-muted);
}
.timeline-company {
  color: var(--accent); font-weight: 500; font-size: 0.95rem;
  margin-bottom: 0.75rem;
}
.timeline-content p, .timeline-content li {
  color: var(--text-muted); font-size: 0.95rem;
}
.timeline-content ul { padding-left: 1.25rem; list-style: disc; margin-top: 0.5rem; }
.timeline-content li { margin-bottom: 0.4rem; }
.timeline-content strong { color: var(--text); }

/* ========== PROJECTS ========== */
.projects-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: var(--surface); border: 1px solid var(--border);
  padding: 1.75rem; border-radius: 12px;
  transition: all 0.25s;
  display: flex; flex-direction: column;
}
.project-card:hover {
  border-color: var(--accent); transform: translateY(-4px);
  box-shadow: 0 10px 30px -10px var(--accent-glow);
}
.project-featured {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--surface) 0%, color-mix(in srgb, var(--accent) 5%, var(--surface)) 100%);
}
.project-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-bottom: 0.75rem; font-weight: 600;
}
.project-card h3 {
  font-size: 1.2rem; font-weight: 700; margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}
.project-card p {
  color: var(--text-muted); font-size: 0.95rem;
  margin-bottom: 1.25rem; flex: 1;
}
.project-card strong { color: var(--text); }
.tech-stack {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.tech-stack span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem; padding: 0.25rem 0.6rem;
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text-muted);
}

/* ========== SKILLS ========== */
.skills-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}
.skill-group {
  background: var(--surface); border: 1px solid var(--border);
  padding: 1.5rem; border-radius: 12px;
}
.skill-group h4 {
  font-size: 1rem; font-weight: 700;
  margin-bottom: 1rem; color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}
.chips {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
}
.chips span {
  font-size: 0.85rem; padding: 0.35rem 0.75rem;
  background: var(--bg-alt); border: 1px solid var(--border);
  border-radius: 20px; color: var(--text);
  transition: all 0.2s;
}
.chips span:hover { border-color: var(--accent); color: var(--accent); }

.recognitions {
  margin-top: 3rem;
}
.recognitions h4 {
  font-size: 1rem; font-weight: 700;
  margin-bottom: 1rem; color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}
.award {
  display: inline-flex; align-items: center; gap: 0.75rem;
  background: var(--surface); border: 1px solid var(--border);
  padding: 1rem 1.5rem; border-radius: 12px;
  color: var(--text);
}
.award svg { color: var(--accent); flex-shrink: 0; }

/* ========== CONTACT (2-column layout) ========== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 3rem;
  position: relative;
  overflow: hidden;
}
.contact-layout::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.6;
}
@media (max-width: 820px) {
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 2rem;
  }
}

/* LEFT: Info */
.contact-info {
  display: flex;
  flex-direction: column;
}
.contact-heading {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}
.contact-tag {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  font-weight: 500;
}
.contact-desc {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 2rem;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.6rem 0;
  color: var(--text);
  font-size: 0.95rem;
  transition: color 0.2s;
}
a.contact-item:hover { color: var(--accent); }
a.contact-item:hover .contact-item-icon {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.contact-item-plain { cursor: default; }
.contact-item-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--accent);
  flex-shrink: 0;
  transition: all 0.2s;
}
.contact-socials {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.contact-socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all 0.2s;
}
.contact-socials a:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  transform: translateY(-2px);
}

/* RIGHT: Form */
.contact-form {
  text-align: left;
  position: relative;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 560px) {
  .form-grid { grid-template-columns: 1fr; gap: 0; }
}

.form-row {
  margin-bottom: 1.25rem;
}
.form-row label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.form-row .req {
  color: var(--accent);
  margin-left: 0.15rem;
}
.form-row input,
.form-row textarea {
  width: 100%;
  padding: 0.8rem 0.95rem;
  background: var(--bg-alt);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}
.form-row input:hover,
.form-row textarea:hover {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}
.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: var(--bg);
}
.form-row textarea {
  resize: vertical;
  min-height: 110px;
  line-height: 1.5;
}

.form-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.5rem;
}
.form-submit {
  min-width: 140px;
  justify-content: center;
  padding: 0.8rem 1.75rem;
  position: relative;
  font-size: 0.95rem;
  font-weight: 600;
  gap: 0.5rem;
  box-shadow: 0 6px 20px -6px var(--accent);
}
.form-submit:hover {
  box-shadow: 0 10px 24px -6px var(--accent);
  transform: translateY(-2px);
}
.form-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}
.btn-arrow { transition: transform 0.2s; }
.form-submit:hover .btn-arrow { transform: translateX(3px); }
.form-submit.loading .btn-arrow { display: none; }

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.form-submit.loading .btn-spinner { display: inline-block; }
.form-submit.loading .btn-text { opacity: 0.7; }
@keyframes spin { to { transform: rotate(360deg); } }

.form-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #ef4444;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-top: 1rem;
  text-align: center;
}

/* ========== TOAST ========== */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--surface);
  border: 1px solid var(--accent);
  padding: 1rem 1.25rem;
  border-radius: 12px;
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5), 0 0 0 4px var(--accent-glow);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 340px;
  transform: translateY(120%);
  opacity: 0;
  transition: transform 0.4s ease, opacity 0.4s ease;
  z-index: 200;
}
.toast.show {
  transform: translateY(0);
  opacity: 1;
}
.toast-icon {
  color: var(--accent);
  flex-shrink: 0;
}
.toast-title {
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
}
.toast-msg {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.15rem;
}
@media (max-width: 520px) {
  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    max-width: none;
  }
}

/* ========== FOOTER ========== */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-small { color: var(--text-dim); margin-top: 0.25rem; font-size: 0.8rem; }

/* ========== SCROLL REVEAL ========== */
.reveal {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }