/* Modern Dark Theme CSS Design System for MLV Soundproofing Visualizer */
:root {
  --bg-dark: #090d16;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --bg-panel: #131c2e;
  --border-color: #1e293b;
  --border-highlight: #334155;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #00fffb;
  --accent-blue: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #a855f7;

  /* Piece Colors for Diagram */
  --piece-a-color: rgba(56, 189, 248, 0.25);
  --piece-a-border: #38bdf8;
  --piece-b-color: rgba(168, 85, 247, 0.25);
  --piece-b-border: #a855f7;
  --piece-c-color: rgba(245, 158, 11, 0.25);
  --piece-c-border: #f59e0b;
  --piece-d-color: rgba(16, 185, 129, 0.25);
  --piece-d-border: #10b981;

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-glow: 0 0 25px rgba(0, 255, 251, 0.15);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 255, 251, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(99, 102, 241, 0.05) 0%, transparent 40%);
}

.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
  gap: 1.5rem;
}

/* Floating Hover Tooltip */
.hover-tooltip {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.95);
  border: 1.5px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 255, 251, 0.2);
  backdrop-filter: blur(12px);
  min-width: 230px;
  transition: opacity 0.15s ease, transform 0.1s ease;
}

.hover-tooltip.hidden {
  opacity: 0;
  transform: scale(0.95);
  visibility: hidden;
}

.tooltip-header {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--accent-cyan);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.35rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tooltip-body {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.tt-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.775rem;
  color: var(--text-muted);
}

.tt-row strong {
  color: var(--text-main);
  font-family: var(--font-mono);
}

.tt-click-prompt {
  margin-top: 0.5rem;
  padding-top: 0.4rem;
  border-top: 1px dashed var(--border-color);
  font-size: 0.7rem;
  color: var(--accent-amber);
  font-weight: 600;
}

/* Modal Window Styles */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  transition: opacity 0.25s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-card {
  background: var(--bg-panel);
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 255, 251, 0.2);
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(17, 24, 39, 0.6);
}

.modal-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.badge-accent {
  background: rgba(0, 255, 251, 0.15);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
}

.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.btn-close:hover {
  color: var(--text-main);
}

/* Stepper Progress Bar */
.stepper-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
}

.step-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 600;
  cursor: pointer;
}

.step-item.active {
  color: var(--accent-cyan);
}

.step-item.completed {
  color: var(--accent-emerald);
}

.step-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-panel);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all 0.2s;
}

.step-item.active .step-circle {
  border-color: var(--accent-cyan);
  background: rgba(0, 255, 251, 0.15);
  color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 255, 251, 0.3);
}

.step-item.completed .step-circle {
  border-color: var(--accent-emerald);
  background: var(--accent-emerald);
  color: #0f172a;
}

.step-line {
  flex: 1;
  height: 2px;
  background: var(--border-color);
  margin: 0 0.75rem;
}

/* Modal Body */
.modal-body {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .modal-body {
    grid-template-columns: 1fr;
  }
}

.modal-visual-column {
  display: flex;
  flex-direction: column;
}

.mini-canvas-card {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mini-canvas-card h4 {
  font-size: 0.8rem;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mini-svg-container {
  width: 100%;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-text-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-text-column h3 {
  font-size: 1.1rem;
  color: var(--text-main);
}

.tut-desc-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.tut-specs-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.spec-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
}

.spec-label {
  color: var(--text-dim);
}

.spec-val {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.pro-tip-card {
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.pro-tip-card strong {
  font-size: 0.825rem;
  color: #e0e7ff;
}

.pro-tip-card p {
  font-size: 0.8rem;
  color: #c7d2fe;
  margin-top: 0.15rem;
}

/* Modal Footer */
.modal-footer {
  padding: 1rem 1.5rem;
  background: rgba(17, 24, 39, 0.6);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.step-counter {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

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

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, rgba(0, 255, 251, 0.2), rgba(99, 102, 241, 0.2));
  border: 1px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.brand h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #ffffff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary-glow {
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #fff;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(0, 255, 251, 0.2);
}

.btn-primary-glow:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 25px rgba(0, 255, 251, 0.4);
}

.btn-cut-guide {
  background: rgba(245, 158, 11, 0.15);
  color: #fde68a;
  border: 1px solid var(--accent-amber);
  font-size: 0.75rem;
  padding: 0.4rem 0.8rem;
}

.btn-cut-guide:hover, .btn-cut-guide.active {
  background: var(--accent-amber);
  color: #0f172a;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

.btn-preset {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  width: 100%;
  justify-content: center;
  font-size: 0.8rem;
}

.btn-preset:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: var(--accent-blue);
}

/* Workspace Layout */
.workspace {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.5rem;
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

/* Panels */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-header h2, .panel-header h3 {
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-main);
}

.panel-section {
  margin-bottom: 1.25rem;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  margin-bottom: 0.5rem;
}

.input-row, .dual-input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.input-group label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

input[type="number"], select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color 0.2s ease;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.dim-converted {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-top: 0.35rem;
  font-weight: 500;
}

/* Verdict Cards */
.verdict-card {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
}

.verdict-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--accent-emerald);
  color: #a7f3d0;
}

.verdict-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--accent-amber);
  color: #fde68a;
}

.verdict-danger {
  background: rgba(244, 63, 94, 0.1);
  border-color: var(--accent-rose);
  color: #fecdd3;
}

.verdict-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.verdict-detail {
  font-size: 0.8rem;
  opacity: 0.95;
  line-height: 1.4;
}

.preset-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Center & Visuals Section */
.visuals-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Stats Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 900px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
}

.stat-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-main);
  margin: 0.2rem 0;
}

.stat-value small {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.stat-sub {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.text-success { color: var(--accent-emerald) !important; }
.text-warning { color: var(--accent-amber) !important; }
.text-danger { color: var(--accent-rose) !important; }
.text-accent { color: var(--accent-cyan) !important; }

/* Claude Explainer Banner */
.claude-explainer-banner {
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.12), rgba(0, 255, 251, 0.08));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.banner-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.banner-content h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: #e0e7ff;
  margin-bottom: 0.25rem;
}

.banner-content p {
  font-size: 0.825rem;
  color: #c7d2fe;
  line-height: 1.45;
}

/* Canvas Layout */
.visuals-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 1200px) {
  .visuals-grid {
    grid-template-columns: 1fr;
  }
}

.canvas-panel {
  min-height: 420px;
}

.canvas-legend {
  display: flex;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-box {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  border: 1px solid transparent;
}

.legend-box.piece-a { background: var(--piece-a-color); border-color: var(--piece-a-border); }
.legend-box.piece-b { background: var(--piece-b-color); border-color: var(--piece-b-border); }
.legend-box.piece-c { background: var(--piece-c-color); border-color: var(--piece-c-border); }
.legend-box.seam-line { background: rgba(0, 255, 251, 0.4); border-color: var(--accent-cyan); }

.canvas-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  overflow: hidden;
  position: relative;
}

svg {
  width: 100%;
  height: 100%;
  max-height: 360px;
}

/* SVG Interactive Styling */
.interactive-piece {
  cursor: pointer;
  transition: all 0.2s ease;
}

.interactive-piece:hover, .interactive-piece.active-hover {
  stroke-width: 3.5px !important;
  filter: drop-shadow(0 0 12px rgba(0, 255, 251, 0.6));
  opacity: 0.95;
}

.canvas-footer {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 12px;
}

.badge-neutral {
  background: var(--bg-card-hover);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .info-grid {
    grid-template-columns: 1fr;
  }
}

.cut-steps-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.cut-step-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--bg-card);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-indigo);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-details strong {
  font-size: 0.85rem;
  color: var(--text-main);
}

.step-details p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.tips-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tips-list li {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  background: var(--bg-card);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.tip-icon {
  font-size: 1.2rem;
  line-height: 1;
}

.tips-list strong {
  font-size: 0.85rem;
  color: var(--text-main);
  display: block;
}

.tips-list p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }