/* ===================================
   Variables & Base Styles
   =================================== */
:root {
  --color-bg: #0d1117;
  --color-bg-secondary: #161b22;
  --color-bg-tertiary: #21262d;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-secondary: #8b949e;
  --color-text-muted: #6e7681;
  --color-accent: #58a6ff;
  --color-accent-hover: #79b8ff;
  --color-success: #3fb950;
  --color-frontend: #f97583;
  --color-backend: #79c0ff;
  --color-database: #d2a8ff;
  --color-infra: #ffa657;
  --color-devops: #7ee787;
  --font-primary: 'Zen Kaku Gothic New', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ===================================
   Background Pattern
   =================================== */
.background-pattern {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 25% 25%, rgba(88, 166, 255, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 75% 75%, rgba(210, 168, 255, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(126, 231, 135, 0.02) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.background-pattern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(88, 166, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 166, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===================================
   Container
   =================================== */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
}

/* ===================================
   Header Section
   =================================== */
.header {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-success), var(--color-frontend));
}

.header-content {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
}

@media (max-width: 768px) {
  .header {
    padding: 2rem 1.5rem;
  }
  
  .header-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }
}

/* Profile Image */
.profile-image-wrapper {
  position: relative;
  flex-shrink: 0;
}

.profile-image {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.profile-image:hover {
  transform: scale(1.05);
  border-color: var(--color-accent);
}

.profile-status {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-success);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Header Text */
.header-text {
  flex: 1;
}

.name {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.intro {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
  .name {
    font-size: 1.8rem;
  }
  
  .title {
    font-size: 1rem;
  }
  
  .intro {
    font-size: 0.9rem;
  }
  
  .intro br {
    display: none;
  }
}

/* Contact Links */
.contact-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .contact-links {
    justify-content: center;
  }
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: var(--transition);
}

.contact-link:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.contact-link i {
  font-size: 1rem;
}

/* ===================================
   Section Styles
   =================================== */
.section {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-title i {
  color: var(--color-accent);
  font-size: 1.25rem;
}

/* ===================================
   Skills Section
   =================================== */
.skills-grid {
  display: grid;
  gap: 1.5rem;
}

.skill-category {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.skill-category.visible {
  opacity: 1;
  transform: translateX(0);
}

.skill-category:nth-child(2) { transition-delay: 0.1s; }
.skill-category:nth-child(3) { transition-delay: 0.2s; }
.skill-category:nth-child(4) { transition-delay: 0.3s; }
.skill-category:nth-child(5) { transition-delay: 0.4s; }

.skill-category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category-title i {
  width: 24px;
  text-align: center;
}

/* Frontend category */
.skill-category:nth-child(1) .skill-category-title i {
  color: var(--color-frontend);
}

/* Backend category */
.skill-category:nth-child(2) .skill-category-title i {
  color: var(--color-backend);
}

/* Database category */
.skill-category:nth-child(3) .skill-category-title i {
  color: var(--color-database);
}

/* Infra category */
.skill-category:nth-child(4) .skill-category-title i {
  color: var(--color-infra);
}

/* DevOps category */
.skill-category:nth-child(5) .skill-category-title i {
  color: var(--color-devops);
}

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

.skill-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-weight: 500;
  transition: var(--transition);
  cursor: default;
}

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

.skill-tag.frontend {
  background: rgba(249, 117, 131, 0.15);
  color: var(--color-frontend);
  border: 1px solid rgba(249, 117, 131, 0.3);
}

.skill-tag.backend {
  background: rgba(121, 192, 255, 0.15);
  color: var(--color-backend);
  border: 1px solid rgba(121, 192, 255, 0.3);
}

.skill-tag.database {
  background: rgba(210, 168, 255, 0.15);
  color: var(--color-database);
  border: 1px solid rgba(210, 168, 255, 0.3);
}

.skill-tag.infra {
  background: rgba(255, 166, 87, 0.15);
  color: var(--color-infra);
  border: 1px solid rgba(255, 166, 87, 0.3);
}

.skill-tag.devops {
  background: rgba(126, 231, 135, 0.15);
  color: var(--color-devops);
  border: 1px solid rgba(126, 231, 135, 0.3);
}

/* ===================================
   Timeline (Career)
   =================================== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item:nth-child(2) { transition-delay: 0.1s; }
.timeline-item:nth-child(3) { transition-delay: 0.2s; }
.timeline-item:nth-child(4) { transition-delay: 0.3s; }

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  border: 3px solid var(--color-border);
  z-index: 1;
}

.timeline-marker.current {
  background: var(--color-success);
  border-color: var(--color-success);
  box-shadow: 0 0 0 4px rgba(63, 185, 80, 0.2);
}

.timeline-content {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: var(--transition);
}

.timeline-content:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

/* Accordion functionality */
.timeline-header-clickable {
  cursor: pointer;
  position: relative;
  padding-right: 2rem;
}

.toggle-icon {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: transform 0.3s ease, color 0.3s ease;
}

.timeline-content.open .toggle-icon {
  transform: translateY(-50%) rotate(180deg);
  color: var(--color-accent);
}

.timeline-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
  opacity: 0;
}

.timeline-content.open .timeline-details {
  max-height: 2000px;
  opacity: 1;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-company {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
}

.timeline-role {
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.timeline-description {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Project List */
.project-list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.85rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--color-text);
  transition: var(--transition);
}

.project-item:hover {
  border-color: var(--color-accent);
  background: var(--color-bg-tertiary);
}

.project-item i {
  width: 20px;
  text-align: center;
  font-size: 0.9rem;
}

.project-item:nth-child(1) i {
  color: var(--color-devops);
}

.project-item:nth-child(2) i {
  color: var(--color-database);
}

.project-item:nth-child(3) i {
  color: var(--color-frontend);
}

.project-item:nth-child(4) i {
  color: var(--color-backend);
}

.project-item:nth-child(5) i {
  color: var(--color-infra);
}

.project-item:nth-child(6) i {
  color: var(--color-accent);
}

/* Work Category (for detailed job descriptions) */
.work-category {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border);
}

.work-category:first-of-type {
  margin-top: 1rem;
  padding-top: 0;
  border-top: none;
}

.work-category-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.work-category-title i {
  color: var(--color-accent);
  font-size: 0.8rem;
}

.work-category .project-list {
  margin-top: 0;
}

.work-category .project-item {
  font-size: 0.8rem;
  padding: 0.5rem 0.75rem;
}

.work-category .project-item i {
  color: var(--color-text-muted);
}

.work-category .project-item:hover i {
  color: var(--color-accent);
}

/* Detailed Project Items */
.project-item-detailed {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  transition: var(--transition);
}

.project-item-detailed:last-child {
  margin-bottom: 0;
}

.project-item-detailed:hover {
  border-color: var(--color-accent);
  background: var(--color-bg-tertiary);
}

.project-item-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.project-item-header i {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  width: 18px;
  text-align: center;
}

.project-item-detailed:hover .project-item-header i {
  color: var(--color-accent);
}

.project-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  flex: 1;
}

.project-duration {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  background: rgba(88, 166, 255, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
}

.project-detail {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin: 0.5rem 0 0 1.7rem;
  line-height: 1.5;
}

/* ===================================
   Certifications
   =================================== */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.certification-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.certification-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.certification-card:nth-child(2) { transition-delay: 0.1s; }
.certification-card:nth-child(3) { transition-delay: 0.2s; }
.certification-card:nth-child(4) { transition-delay: 0.3s; }

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

.certification-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent), var(--color-success));
  border-radius: 12px;
  flex-shrink: 0;
}

.certification-icon i {
  font-size: 1.25rem;
  color: var(--color-bg);
}

.certification-info {
  flex: 1;
  min-width: 0;
}

.certification-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.25rem;
}

.certification-org {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ===================================
   Footer
   =================================== */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ===================================
   Responsive Adjustments
   =================================== */
@media (max-width: 480px) {
  .profile-image {
    width: 120px;
    height: 120px;
  }
  
  .section {
    padding: 1.5rem;
  }
  
  .timeline {
    padding-left: 1.5rem;
  }
  
  .timeline-marker {
    left: -1.5rem;
  }
  
  .certifications-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .background-pattern {
    display: none;
  }
  
  .section,
  .skill-category,
  .timeline-item,
  .certification-card {
    opacity: 1 !important;
    transform: none !important;
  }
}