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

:root {
  --primary: #0a192f;
  --primary-light: #112240;
  --primary-lighter: #1a2d4a;
  --accent: #64ffda;
  --accent-hover: #45e0be;
  --text-primary: #e6f1ff;
  --text-secondary: #8892b0;
  --text-muted: #495670;
  --card-bg: #112240;
  --card-border: #1e3a5f;
  --gradient-1: linear-gradient(135deg, #0a192f, #1a2d4a);
  --gradient-accent: linear-gradient(135deg, #64ffda, #48c6ef);
  --shadow: 0 10px 30px -15px rgba(2, 12, 27, 0.7);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  color: var(--accent-hover);
}

/* ===== HEADER / NAV ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

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

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  transition: all var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: rgba(100, 255, 218, 0.08);
}

.nav-links a::before {
  content: '0' counter(item) '.';
  counter-increment: item;
  color: var(--accent);
  font-size: 0.75rem;
  margin-right: 4px;
}

.nav-links {
  counter-reset: item;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ===== MAIN CONTENT ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 24px 60px;
  min-height: calc(100vh - 120px);
}

/* ===== HERO SECTION ===== */
.hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100vh - 100px);
  padding: 40px 0;
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.hero-title-accent {
  font-size: clamp(1.8rem, 6vw, 3.5rem);
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-description {
  max-width: 540px;
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:hover {
  background: rgba(100, 255, 218, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(100, 255, 218, 0.15);
}

.btn-primary {
  background: var(--accent);
  color: var(--primary);
  font-weight: 600;
}

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

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== PAGE HEADER ===== */
.page-header {
  padding: 40px 0 32px;
}

.page-header h1 {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.page-header .subtitle {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-header .subtitle::after {
  content: '';
  display: block;
  height: 1px;
  flex: 1;
  background: var(--card-border);
}

/* ===== TIMELINE (Experience) ===== */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--card-border);
}

.timeline-item {
  position: relative;
  padding: 24px;
  margin-bottom: 24px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  transition: all var(--transition);
}

.timeline-item:hover {
  border-color: var(--accent);
  transform: translateX(4px);
  box-shadow: var(--shadow);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 32px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.timeline-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-company {
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.timeline-duties {
  list-style: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.timeline-duties li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 6px;
}

.timeline-duties li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ===== SKILLS ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.skill-category h3 {
  font-size: 1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--card-border);
}

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

.skill-tag {
  padding: 6px 14px;
  background: rgba(100, 255, 218, 0.08);
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.skill-tag:hover {
  background: rgba(100, 255, 218, 0.15);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ===== LANGUAGE BARS ===== */
.lang-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--card-border);
}

.lang-item:last-child {
  border-bottom: none;
}

.lang-name {
  font-weight: 500;
}

.lang-level {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

/* ===== CONTACT PAGE ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.contact-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.contact-card h3 {
  font-size: 0.9rem;
  font-family: var(--font-mono);
  color: var(--accent);
  margin-bottom: 8px;
}

.contact-card p,
.contact-card a {
  font-size: 1rem;
  color: var(--text-primary);
  word-break: break-all;
}

.contact-card a:hover {
  color: var(--accent);
}

/* ===== ABOUT PAGE ===== */
.about-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 40px;
  margin-top: 32px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1.05rem;
  line-height: 1.8;
}

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

.about-info-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: all var(--transition);
}

.about-info-item:hover {
  border-color: var(--accent);
}

.about-info-item .label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.about-info-item .value {
  font-size: 1rem;
  color: var(--text-primary);
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 32px 24px;
  border-top: 1px solid var(--card-border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 25, 47, 0.98);
    backdrop-filter: blur(12px);
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--card-border);
  }

  .nav-links.open {
    display: flex;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .about-info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-title-accent {
    font-size: 1.5rem;
  }

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

@media (max-width: 480px) {
  .about-info-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}