/* ==========================================================================
   UCTRONICS Arduino Project Hub & Python Studio - Stylesheet
   ========================================================================== */

:root {
  --bg-dark: #090d16;
  --bg-card: #131b2e;
  --bg-card-hover: #1c2742;
  --bg-modal: #0f172a;
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #1e293b;
  --glass-bg: rgba(19, 27, 46, 0.75);
  --glass-border: rgba(255, 255, 255, 0.08);
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-code: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  min-height: 100vh;
  background-image: 
    radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.12) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.12) 0px, transparent 50%);
  background-attachment: fixed;
}

/* Container */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Cutout Images & Component Gallery */
.card-img-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-cutout-img {
  width: 54px;
  height: 54px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.9);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.components-img-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.mini-img-chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.6rem;
  border-radius: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mini-img-chip img {
  width: 22px;
  height: 22px;
  object-fit: cover;
  border-radius: 4px;
}

.modal-comp-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.75rem;
  min-width: 110px;
  max-width: 140px;
  transition: transform 0.2s ease;
}

.modal-comp-card:hover {
  transform: scale(1.05);
  border-color: var(--accent-cyan);
}

.modal-comp-img {
  width: 70px;
  height: 70px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: #000;
}

.modal-comp-name {
  font-size: 0.78rem;
  color: var(--text-main);
  font-weight: 500;
  line-height: 1.2;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 3rem;
  padding: 2rem 1rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.kit-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header h1 {
  font-size: 2.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent-cyan) 50%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem;
}

.header p {
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 750px;
  margin: 0 auto 1.5rem auto;
}

/* Inventory Pill Bar */
.hardware-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.hw-tag {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.75rem;
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Prerequisites Banner & Section */
.prereq-section {
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: 20px;
  margin-bottom: 2.5rem;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.prereq-header {
  padding: 1.25rem 1.75rem;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.15), rgba(6, 182, 212, 0.15));
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  border-bottom: 1px solid var(--border-color);
}

.prereq-title {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.prereq-icon {
  font-size: 2rem;
}

.prereq-title h2 {
  font-size: 1.35rem;
  color: var(--text-main);
}

.prereq-title p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.prereq-toggle-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.prereq-body {
  padding: 1.75rem;
}

.prereq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.prereq-card {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.25rem;
  position: relative;
}

.card-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.prereq-card h3 {
  font-size: 1.05rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
  padding-right: 4rem;
}

.prereq-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.prereq-list {
  padding-left: 1.2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.prereq-list li {
  margin-bottom: 0.4rem;
}

.prereq-list a {
  color: var(--accent-cyan);
  text-decoration: underline;
}

.lib-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.lib-tag {
  background: rgba(139, 92, 246, 0.15);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: #d8b4fe;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
}

.cmd-box {
  background: #060913;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.cmd-box code {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: #38bdf8;
  word-break: break-all;
}

.copy-cmd-btn {
  align-self: flex-end;
  background: rgba(6, 182, 212, 0.2);
  border: 1px solid rgba(6, 182, 212, 0.4);
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
}

.copy-cmd-btn:hover {
  background: var(--accent-cyan);
  color: #000;
}

/* Controls & Filters */
.controls-section {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  background: var(--bg-card);
  padding: 1.25rem;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.search-box {
  position: relative;
  flex: 1;
  min-width: 280px;
}

.search-box input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

.search-box .search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.6rem 1.1rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

.filter-btn.active {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.project-icon {
  font-size: 2.2rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.5rem 0.8rem;
  border-radius: 12px;
}

.difficulty-tag {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.difficulty-tag.beginner {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.difficulty-tag.medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.difficulty-tag.advanced {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.components-list-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.mini-comp-badge {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  margin-top: auto;
}

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

.view-project-btn {
  background: rgba(6, 182, 212, 0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.project-card:hover .view-project-btn {
  background: var(--accent-cyan);
  color: #000;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 1.5rem;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-container {
  background: var(--bg-modal);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 100%;
  max-width: 950px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  position: relative;
  animation: modalSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  background: var(--bg-modal);
  z-index: 10;
}

.modal-title-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.modal-close-btn:hover {
  background: rgba(244, 63, 94, 0.2);
  color: var(--accent-rose);
}

.modal-body {
  padding: 2rem;
}

/* Interactive Breadboard Visualizer Engine */
.breadboard-container {
  width: 100%;
  min-height: 420px;
  background: #080c16;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 1rem;
  overflow-x: auto;
  position: relative;
}

.circuit-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.wire-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(15, 23, 42, 0.8);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
}

.legend-line {
  width: 24px;
  height: 4px;
  border-radius: 2px;
}

.diagram-svg-wrapper {
  width: 100%;
  overflow-x: auto;
}

.svg-wire {
  stroke-dasharray: 1000;
  stroke-dashoffset: 0;
  transition: all 0.3s ease;
  cursor: pointer;
}

.svg-wire:hover {
  stroke-width: 6px !important;
  filter: drop-shadow(0 0 8px currentColor);
}

.diagram-gen-img {
  width: 100%;
  max-height: 380px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  margin-top: 1rem;
}

/* Wiring Table */
.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.wiring-table-container {
  overflow-x: auto;
  margin-bottom: 2rem;
}

.wiring-table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(19, 27, 46, 0.5);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.wiring-table th, .wiring-table td {
  padding: 0.8rem 1.2rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.wiring-table th {
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
}

.wiring-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Code Tabs */
.code-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.code-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.6rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.code-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.code-tab-btn.active {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.code-block-wrapper {
  position: relative;
  background: #060913;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.code-lang-label {
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
}

.copy-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-main);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: var(--accent-cyan);
  color: #000;
}

pre code {
  font-family: var(--font-code);
  font-size: 0.875rem;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}

/* Assembly Steps */
.assembly-steps {
  list-style: none;
  counter-reset: step-counter;
}

.assembly-steps li {
  counter-increment: step-counter;
  position: relative;
  padding-left: 3rem;
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.assembly-steps li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--accent-green);
  color: #000;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 2000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
  .header h1 { font-size: 2rem; }
  .controls-section { flex-direction: column; align-items: stretch; }
  .projects-grid { grid-template-columns: 1fr; }
  .modal-container { max-height: 95vh; }
}