/* ==========================================
   Professional IT Project Portfolio Styles
   ========================================== */

:root {
  /* Colors */
  --primary-color: #2563eb;
  --secondary-color: #3b82f6;
  --accent-color: #8b5cf6;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;

  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;

  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-card: #ffffff;

  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-primary: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-secondary: "Inter", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition: 0.3s ease;
  --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
  --primary-color: #3b82f6;
  --secondary-color: #60a5fa;
  --accent-color: #a78bfa;

  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;

  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;

  --border-color: #334155;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-secondary);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  transition: background-color var(--transition), color var(--transition);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ==========================================
   Theme Toggle
   ========================================== */
.theme-toggle {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 20px;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  transform: translateY(-3px) rotate(15deg);
  box-shadow: var(--shadow-xl);
}

/* ==========================================
   Navigation
   ========================================== */
.navbar {
  position: sticky;
  top: 0;
  background: var(--bg-card);
  box-shadow: var(--shadow);
  z-index: 999;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand a {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

.nav-name {
  font-family: var(--font-primary);
  font-size: 20px;
  font-weight: 700;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

/* ==========================================
   Hero Section
   ========================================== */
.hero-section {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(
    135deg,
    var(--bg-secondary) 0%,
    var(--bg-primary) 100%
  );
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-primary);
  font-size: 56px;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.highlight {
  color: var(--primary-color);
  position: relative;
}

.highlight::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.quick-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.stat-item {
  background: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition);
}

.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--accent-color)
  );
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: white;
}

.stat-content h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 4px;
}

.stat-content p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==========================================
   Filter Section
   ========================================== */
.filter-section {
  padding: var(--spacing-2xl) 0;
  background: var(--bg-secondary);
}

.search-container {
  position: relative;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 18px;
}

.search-input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 50px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  color: var(--text-primary);
  transition: all var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.clear-btn {
  position: absolute;
  right: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 18px;
  padding: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.clear-btn:hover {
  color: var(--danger-color);
}

.filter-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.filter-tab {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.filter-tab:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.filter-tab.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.view-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.sort-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.sort-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  transition: border-color var(--transition);
}

.sort-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.view-toggle {
  display: flex;
  gap: var(--spacing-sm);
}

.view-btn {
  width: 40px;
  height: 40px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.view-btn:hover,
.view-btn.active {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* ==========================================
   Projects Section
   ========================================== */
.projects-section {
  padding: var(--spacing-2xl) 0;
}

.projects-header {
  margin-bottom: var(--spacing-xl);
}

.projects-header h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
}

.projects-header h2 span {
  color: var(--primary-color);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: var(--spacing-xl);
}

.projects-grid.list-view {
  grid-template-columns: 1fr;
}

/* Project Card */
.project-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project-image {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--bg-tertiary);
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover .project-image img {
  transform: scale(1.1);
}

.project-status {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--success-color);
  color: white;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.project-category {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
}

.project-content {
  padding: var(--spacing-lg);
}

.project-header {
  margin-bottom: var(--spacing-md);
}

.project-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.project-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.tag {
  padding: 4px 12px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--primary-color);
  color: white;
}

.project-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.project-tech {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.tech-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.tech-icon:hover {
  background: var(--primary-color);
  color: white;
}

.project-year {
  font-size: 14px;
  color: var(--text-tertiary);
  font-weight: 600;
}

/* List View */
.projects-grid.list-view .project-card {
  display: grid;
  grid-template-columns: 300px 1fr;
}

.projects-grid.list-view .project-image {
  height: 100%;
}

/* No Results */
.no-results {
  text-align: center;
  padding: var(--spacing-2xl);
}

.no-results i {
  font-size: 64px;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-lg);
}

.no-results h3 {
  font-size: 24px;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.no-results p {
  color: var(--text-secondary);
}

/* ==========================================
   Modal
   ========================================== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  overflow-y: auto;
}

.modal.active {
  display: block;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
}

.modal-content {
  position: relative;
  max-width: 1000px;
  margin: var(--spacing-2xl) auto;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  z-index: 10000;
}

.modal-close {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: none;
  cursor: pointer;
  font-size: 20px;
  color: var(--text-primary);
  transition: all var(--transition);
  z-index: 10001;
}

.modal-close:hover {
  background: var(--danger-color);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  padding: var(--spacing-2xl);
}

.modal-project-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
}

.modal-project-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.modal-project-meta {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 14px;
  color: var(--text-secondary);
}

.modal-project-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.modal-section {
  margin-bottom: var(--spacing-xl);
}

.modal-section h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  list-style: none;
}

.feature-list li {
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.feature-list li::before {
  content: "✓";
  width: 24px;
  height: 24px;
  background: var(--primary-color);
  color: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tech-badge {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.action-btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
}

.action-btn.primary {
  background: var(--primary-color);
  color: white;
}

.action-btn.secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

/* ==========================================
   Back to Top
   ========================================== */
.back-to-top {
  position: fixed;
  bottom: 100px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 20px;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  background: var(--bg-secondary);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-logo {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-md);
}

.footer-text {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: all var(--transition);
}

.social-links a:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

.footer-section h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-color);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tech-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.footer-bottom i {
  color: var(--danger-color);
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 40px;
  }

  .quick-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-menu {
    display: none;
  }

  .filter-tabs {
    flex-direction: column;
  }

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

  .projects-grid.list-view .project-card {
    grid-template-columns: 1fr;
  }

  .view-options {
    flex-direction: column;
  }

  .modal-content {
    margin: var(--spacing-md);
  }

  .modal-body {
    padding: var(--spacing-lg);
  }

  .modal-project-title {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 32px;
  }

  .quick-stats {
    grid-template-columns: 1fr;
  }

  .theme-toggle,
  .back-to-top {
    width: 50px;
    height: 50px;
  }
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

.project-card {
  animation: fadeIn 0.5s ease-out;
}