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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-card-hover: #1a2744;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --accent: #6c63ff;
  --accent-hover: #7f78ff;
  --accent-glow: rgba(108, 99, 255, 0.15);
  --border: #2a2a40;
  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s ease;

  /* Tag colours */
  --tag-js: #f7df1e;
  --tag-cs: #68217a;
  --tag-py: #3776ab;
  --tag-html: #e34f26;
  --tag-node: #339933;
  --tag-docker: #2496ed;
  --tag-blazor: #512bd4;
  --tag-sqlite: #003b57;
  --tag-mongo: #47a248;
  --tag-sql: #cc2927;
  --tag-git: #f05032;
  --tag-linux: #fcc624;
  --tag-dotnet: #512bd4;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

/* ========== Navigation ========== */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

#navbar.scrolled {
  border-bottom-color: var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--accent);
  border-radius: 8px;
  transition: background var(--transition);
}

.nav-logo:hover {
  background: var(--accent-glow);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Language toggle */
.lang-toggle {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.25rem 0.6rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition);
  margin-left: 1.5rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.lang-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* i18n smooth transition */
[data-i18n] {
  transition: opacity 0.25s ease;
}

[data-i18n].i18n-fade {
  opacity: 0;
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========== Hero ========== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-content {
  max-width: 700px;
  position: relative;
  z-index: 1;
}

.hero-greeting {
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
  letter-spacing: 0.5px;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, #a0a0cc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.hero-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* Hero decorative circles */
.hero-decoration {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
}

.hero-circle {
  width: 350px;
  height: 350px;
  border-radius: 50%;
  border: 1px solid var(--border);
  opacity: 0.3;
  animation: pulse 6s ease-in-out infinite;
}

.hero-circle--sm {
  width: 200px;
  height: 200px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: 3s;
}

@keyframes pulse {
  0%, 100% { opacity: 0.15; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(1.05); }
}

.hero-circle--sm {
  animation-name: pulse;
}

/* ========== Core Strengths ========== */
#strengths {
  background: var(--bg-secondary);
}

.strengths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.strength-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.strength-item:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 6px 24px rgba(108, 99, 255, 0.1);
}

.strength-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 10px;
  color: var(--accent);
}

.strength-icon svg {
  width: 20px;
  height: 20px;
}

.strength-item span {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* ========== Sections ========== */
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 3rem;
}

/* ========== Projects ========== */
#projects {
  background: var(--bg-secondary);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 30px rgba(108, 99, 255, 0.12);
}

.project-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: 10px;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.project-icon svg {
  width: 22px;
  height: 22px;
}

.project-name {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 1.25rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.tag--js { color: var(--tag-js); border-color: rgba(247, 223, 30, 0.3); }
.tag--cs { color: #bf8fef; border-color: rgba(104, 33, 122, 0.4); }
.tag--py { color: #6da4d6; border-color: rgba(55, 118, 171, 0.4); }
.tag--html { color: #e88a6f; border-color: rgba(227, 79, 38, 0.3); }
.tag--node { color: #5fbf5f; border-color: rgba(51, 153, 51, 0.3); }
.tag--docker { color: #5cb3f0; border-color: rgba(36, 150, 237, 0.3); }
.tag--blazor { color: #9b7fef; border-color: rgba(81, 43, 212, 0.3); }
.tag--sqlite { color: #4a9ab5; border-color: rgba(0, 59, 87, 0.4); }

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 500;
  transition: color var(--transition);
}

.project-link svg {
  width: 14px;
  height: 14px;
}

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

.project-link-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ========== Skills ========== */
#skills {
  background: var(--bg-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition);
}

.skill-category:hover {
  border-color: var(--accent);
}

.skill-category-title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: transform var(--transition), border-color var(--transition);
}

.skill-badge:hover {
  transform: translateY(-2px);
}

.skill-badge--js { color: var(--tag-js); border-color: rgba(247, 223, 30, 0.25); }
.skill-badge--cs { color: #bf8fef; border-color: rgba(104, 33, 122, 0.3); }
.skill-badge--py { color: #6da4d6; border-color: rgba(55, 118, 171, 0.3); }
.skill-badge--html { color: #e88a6f; border-color: rgba(227, 79, 38, 0.25); }
.skill-badge--dotnet { color: #9b7fef; border-color: rgba(81, 43, 212, 0.3); }
.skill-badge--node { color: #5fbf5f; border-color: rgba(51, 153, 51, 0.25); }
.skill-badge--docker { color: #5cb3f0; border-color: rgba(36, 150, 237, 0.25); }
.skill-badge--sqlite { color: #4a9ab5; border-color: rgba(0, 59, 87, 0.35); }
.skill-badge--mongo { color: #6fc96f; border-color: rgba(71, 162, 72, 0.25); }
.skill-badge--sql { color: #e06060; border-color: rgba(204, 41, 39, 0.25); }
.skill-badge--git { color: #f07050; border-color: rgba(240, 80, 50, 0.25); }
.skill-badge--linux { color: var(--tag-linux); border-color: rgba(252, 198, 36, 0.25); }

/* ========== Contact ========== */
#contact {
  background: var(--bg-secondary);
}

.contact-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.75rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  min-width: 260px;
}

.contact-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 6px 24px rgba(108, 99, 255, 0.1);
}

.contact-card svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--accent);
}

.contact-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.15rem;
}

.contact-value {
  display: block;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ========== Footer ========== */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* ========== Animations ========== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 26, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 0;
    gap: 1.25rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.35s ease;
    z-index: 99;
  }

  .nav-links.open {
    transform: translateY(0);
  }

  .nav-links a {
    font-size: 1rem;
    padding: 0.25rem 0;
  }

  .lang-toggle {
    margin-left: auto;
    margin-right: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  #hero {
    padding: 5rem 1.5rem 3rem;
    min-height: 100svh;
    justify-content: flex-start;
    align-items: flex-start;
    padding-top: 6rem;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-greeting {
    font-size: 1rem;
  }

  .hero-intro {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 2rem;
  }

  .hero-actions {
    flex-direction: column;
    gap: 0.75rem;
  }

  .btn {
    justify-content: center;
    padding: 0.85rem 1.5rem;
    font-size: 1rem;
    width: 100%;
  }

  .hero-decoration {
    display: none;
  }

  .strengths-grid {
    grid-template-columns: 1fr;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    padding: 1.5rem;
  }

  .skills-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-card {
    min-width: auto;
    width: 100%;
  }

  .section-container {
    padding: 3.5rem 1.25rem;
  }

  .section-title {
    font-size: 1.6rem;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: 2.8rem;
  }

  .hero-title {
    font-size: 1.05rem;
    line-height: 1.5;
  }

  .nav-container {
    padding: 0 1rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .skill-badge {
    font-size: 0.75rem;
    padding: 0.35rem 0.7rem;
  }

  .section-container {
    padding: 3rem 1rem;
  }

  .strength-item {
    padding: 1rem 1.25rem;
  }
}