/* ===== CSS VARIABLES ===== */
:root {
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --surface: #ffffff;
  --surface-border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-alpha: rgba(37, 99, 235, 0.1);
  --primary-alpha2: rgba(37, 99, 235, 0.2);
  --accent: #7c3aed;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --nav-bg: rgba(248, 250, 252, 0.85);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0a0f1e;
  --bg-alt: #0d1425;
  --surface: #111827;
  --surface-border: #1e2a3e;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-alpha: rgba(59, 130, 246, 0.12);
  --primary-alpha2: rgba(59, 130, 246, 0.25);
  --accent: #a78bfa;
  --nav-bg: rgba(10, 15, 30, 0.85);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

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

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--surface-border);
  transition: background var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  white-space: nowrap;
}

.logo-prefix { color: var(--primary); }

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--primary-alpha);
}

.theme-toggle {
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}

.theme-toggle:hover { color: var(--primary); border-color: var(--primary); }

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px var(--primary-alpha2);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 6px 20px var(--primary-alpha2); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--surface-border);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-alpha); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover { color: var(--text); background: var(--primary-alpha); }

.btn-arrow { transition: transform var(--transition); }
.btn-primary:hover .btn-arrow { transform: translateX(4px); }

.btn-full { width: 100%; justify-content: center; height: 48px; font-size: 0.95rem; }

/* ===== SECTIONS ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 48px;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(80px);
  opacity: 0.2;
}

.orb-1 {
  width: 700px; height: 700px;
  background: var(--primary);
  top: -100px; right: -200px;
}
.orb-2 {
  width: 500px; height: 500px;
  background: var(--accent);
  bottom: -100px; left: -200px;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  width: 100%;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 100px;
  background: var(--primary-alpha);
  border: 1px solid var(--primary-alpha2);
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-photo {
  display: flex;
  justify-content: center;
  align-items: center;
}

.photo-ring {
  position: relative;
  width: min(420px, 100%);
  aspect-ratio: 1;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-lg);
}

.photo-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid var(--primary-alpha2);
  animation: spin 40s linear infinite;
}
.photo-ring-inner {
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  border: 1px dashed var(--primary-alpha2);
  animation: spin 25s linear infinite reverse;
}

@keyframes spin { to { transform: rotate(360deg); } }

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-lg);
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.75;
}

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

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

.stat-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.stat-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  font-family: 'JetBrains Mono', monospace;
}

.stat-label { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }

/* ===== TIMELINE ===== */
.about-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 8px;
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 20px;
  bottom: 20px;
  width: 2px;
  background: var(--surface-border);
}

.timeline-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 16px 0;
  position: relative;
}

.timeline-year {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-alt);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 6px 10px;
  flex-shrink: 0;
  width: 56px;
  text-align: center;
  position: relative;
  z-index: 1;
  transition: all var(--transition);
}

.timeline-active .timeline-year {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-alpha);
}

.timeline-content {
  padding-top: 4px;
}

.timeline-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.timeline-active .timeline-title { color: var(--primary); }

.timeline-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.skill-group {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.skill-group:hover { border-color: var(--primary); box-shadow: var(--shadow); }

.skill-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 16px;
  font-family: 'JetBrains Mono', monospace;
}

.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.skill-tag {
  background: var(--primary-alpha);
  color: var(--primary);
  border: 1px solid var(--primary-alpha2);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ===== PROJECTS ===== */
.projects-list { display: flex; flex-direction: column; gap: 32px; }

.project-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover { border-color: var(--primary-alpha2); box-shadow: var(--shadow-lg); }

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
}

.project-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 700;
  display: block;
  margin-bottom: 6px;
  letter-spacing: 0.1em;
}

.project-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
}

.project-github-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
  flex-shrink: 0;
}

.project-github-link:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-alpha); }

.project-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 40px;
  align-items: start;
}

.project-section { margin-bottom: 20px; }

.project-section-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 6px;
}

.project-section p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.65; }

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

.project-tag {
  background: var(--bg-alt);
  color: var(--text-muted);
  border: 1px solid var(--surface-border);
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ===== CODE BLOCKS ===== */
.project-code-block {
  background: var(--code-bg);
  border-radius: 12px;
  overflow: hidden;
  font-size: 0.78rem;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}

.code-dot.red { background: #ff5f57; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #28c840; }

.code-filename {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: rgba(255,255,255,0.4);
  margin-left: 4px;
}

.code-block {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--code-text);
  padding: 20px;
  overflow-x: auto;
  background: var(--code-bg);
  white-space: pre;
  margin: 0;
  border-radius: 0;
}

.folder-tree { border-radius: 12px; }

/* Syntax highlighting */
.c-keyword { color: #c792ea; }
.c-str { color: #c3e88d; }
.c-comment { color: #546e7a; font-style: italic; }
.c-num { color: #f78c6c; }

/* ===== ARCHITECTURE ===== */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.arch-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.arch-card:hover { border-color: var(--primary-alpha2); box-shadow: var(--shadow); }

.arch-card-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 16px 20px;
  border-bottom: 1px solid var(--surface-border);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.05em;
}

.arch-card .code-block {
  border-radius: 0;
  font-size: 0.78rem;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-profile {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
}

.contact-photo-wrap {
  position: relative;
  flex-shrink: 0;
}

.contact-photo {
  width: 80px; height: 80px;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid var(--primary-alpha2);
  box-shadow: var(--shadow);
}

.online-dot {
  position: absolute;
  bottom: -4px; right: -4px;
  width: 18px; height: 18px;
  background: #22c55e;
  border-radius: 50%;
  border: 3px solid var(--bg);
}

.contact-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}

.contact-availability {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.contact-heading {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 16px;
}

.contact-desc {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-details { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }

.contact-detail {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  transition: color var(--transition);
}

.contact-detail-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.contact-detail-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-muted);
}

.contact-detail-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  color: var(--text);
  margin-top: 2px;
}

.social-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.social-links { display: flex; flex-wrap: wrap; gap: 10px; }

.social-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.84rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.social-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.social-github:hover { color: #fff; background: #24292e; border-color: #24292e; }
.social-linkedin:hover { color: #fff; background: #0077b5; border-color: #0077b5; }
.social-instagram:hover { color: #fff; background: linear-gradient(135deg, #f9ce34, #ee2a7b, #6228d7); border-color: transparent; }
.social-telegram:hover { color: #fff; background: #2CA5E0; border-color: #2CA5E0; }
.social-discord:hover { color: #fff; background: #5865F2; border-color: #5865F2; }

/* ===== CONTACT FORM ===== */
.contact-form-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.contact-form-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 200px; height: 200px;
  background: var(--primary-alpha);
  border-radius: 0 20px 0 100%;
  pointer-events: none;
}

.contact-form { display: flex; flex-direction: column; gap: 20px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  border-radius: 10px;
  border: 1.5px solid var(--surface-border);
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  resize: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-alpha);
}

.form-group input.error,
.form-group textarea.error { border-color: #ef4444; }

.form-error {
  font-size: 0.78rem;
  color: #ef4444;
  min-height: 18px;
}

.form-status {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  display: none;
}

.form-status.success { background: rgba(34, 197, 94, 0.1); color: #16a34a; border: 1px solid rgba(34, 197, 94, 0.2); display: block; }
.form-status.error { background: rgba(239, 68, 68, 0.1); color: #dc2626; border: 1px solid rgba(239, 68, 68, 0.2); display: block; }

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

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.footer-github { color: var(--text-muted); transition: color var(--transition); }
.footer-github:hover { color: var(--primary); }

/* ===== REVEAL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero-container { grid-template-columns: 1fr; gap: 40px; }
  .hero-photo { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-timeline::before { left: 27px; }
  .project-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: fixed; top: 64px; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--surface-border); padding: 16px 24px; gap: 8px; }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; margin-left: auto; }
  .theme-toggle { margin-left: 0; }
  .project-card { padding: 24px; }
  .contact-form-card { padding: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .section { padding: 64px 0; }
}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; align-items: flex-start; }
  .social-links { flex-direction: column; }
  .social-btn { justify-content: center; }
}