/* ==========================================================================
   Tile Placement & Cut Layout Planner - Design System & Stylesheet
   Protocol: Anti-AI Slop Design Protocol (Dark Mode Obsidian Workshop)
   Color Palette (60-30-10):
   - 60% Base: #0A0C0E (Obsidian Charcoal)
   - 30% Surface: #14171A & #1C2126 (Workshop Cards & Panels)
   - 10% Accent: #10B981 (Emerald Precision Green) & #F59E0B (Amber Cut Slivers)
   ========================================================================== */

:root {
  --bg: #0A0C0E;
  --surface: #14171A;
  --surface-hover: #1C2126;
  --surface-border: #2A3038;
  
  --text-main: #F3F4F6;
  --text-muted: #9CA3AF;
  --text-subtle: #6B7280;
  
  --accent: #10B981;
  --accent-hover: #059669;
  --accent-subtle: rgba(16, 185, 129, 0.12);
  
  --warning: #F59E0B;
  --warning-subtle: rgba(245, 158, 11, 0.15);
  
  --danger: #EF4444;
  
  --font-display: 'Cabinet Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius: 8px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Layout Container */
.main-layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* App Header */
.app-header {
  background: rgba(10, 12, 14, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--surface-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 26px;
  height: 26px;
  color: var(--accent);
}

.accent-text {
  color: var(--accent);
}

.header-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--surface);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid var(--surface-border);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
}

/* Hero Section */
.hero-section {
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 780px;
}

/* Preset Buttons Bar */
.preset-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.preset-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.25rem;
}

.btn-preset {
  background-color: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--surface-border);
  border-radius: calc(var(--radius) - 2px);
  padding: 0.4rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-preset:hover {
  background-color: var(--surface-hover);
  color: var(--text-main);
  border-color: var(--text-subtle);
}

.btn-preset-active {
  background-color: var(--accent-subtle);
  color: var(--accent);
  border-color: var(--accent);
  font-weight: 700;
}

/* Process Section (3-Step Flow) */
.process-section {
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

.process-step {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
  background-color: var(--accent-subtle);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  line-height: 1;
}

.step-details {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.step-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.step-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Surface Cards & Containers */
.card-surface {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

/* Workbench Grid (Control Panel + Visualizer Display) */
.workbench-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .workbench-grid {
    grid-template-columns: 1fr;
  }
}

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

.panel-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.parameter-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.group-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.input-row {
  display: flex;
  gap: 0.75rem;
}

.input-field {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: relative;
}

.input-field label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
}

.input-field input,
.input-field select {
  background-color: var(--bg);
  border: 1px solid var(--surface-border);
  border-radius: calc(var(--radius) - 2px);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.55rem 0.75rem;
  width: 100%;
  transition: var(--transition);
}

.input-field input:focus,
.input-field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-subtle);
}

.input-unit {
  position: absolute;
  right: 0.75rem;
  top: 2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-subtle);
  pointer-events: none;
}

/* Metric Cards Display Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

@media (max-width: 768px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.15rem 1.25rem;
}

.metric-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

.metric-unit {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-muted);
}

.metric-subtext {
  font-size: 0.78rem;
  color: var(--text-subtle);
}

.status-pass {
  color: var(--accent);
}

.status-warning {
  color: var(--warning);
}

/* Visualizer Card & Canvas */
.visualizer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.visualizer-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
}

.visualizer-actions {
  display: flex;
  gap: 0.5rem;
}

.canvas-wrapper {
  background-color: #070809;
  border: 1px solid var(--surface-border);
  border-radius: calc(var(--radius) - 2px);
  padding: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 420px;
}

.canvas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--surface-border);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.legend-box {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  display: inline-block;
}

.fill-full { background-color: #1E293B; border: 1px solid #334155; }
.fill-cut { background-color: rgba(16, 185, 129, 0.25); border: 1px solid #10B981; }
.fill-sliver { background-color: rgba(245, 158, 11, 0.3); border: 1px solid #F59E0B; }
.stroke-grout { background-color: #0A0C0E; border: 1px dashed #64748B; }

/* SVG Canvas Styling */
#tileSvg rect.tile-full {
  fill: #1E293B;
  stroke: #0A0C0E;
  stroke-width: 1.5px;
  transition: var(--transition);
}

#tileSvg rect.tile-full:hover {
  fill: #334155;
  cursor: pointer;
}

#tileSvg rect.tile-cut {
  fill: rgba(16, 185, 129, 0.22);
  stroke: #10B981;
  stroke-width: 1.5px;
}

#tileSvg rect.tile-sliver {
  fill: rgba(245, 158, 11, 0.35);
  stroke: #F59E0B;
  stroke-width: 1.5px;
}

#tileSvg text {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: #94A3B8;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

/* Cut Schedule Data Table */
.table-card {
  overflow: hidden;
}

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

.table-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
}

.table-caption {
  font-size: 0.82rem;
  color: var(--text-subtle);
}

.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background-color: var(--bg);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--surface-border);
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--surface-border);
  font-family: var(--font-mono);
}

.data-table tbody tr:hover {
  background-color: var(--surface-hover);
}

/* Buttons & Controls */
.btn-secondary {
  background-color: var(--surface-hover);
  color: var(--text-main);
  border: 1px solid var(--surface-border);
  border-radius: calc(var(--radius) - 2px);
  padding: 0.45rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background-color: var(--surface-border);
  border-color: var(--text-subtle);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: none;
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
}

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

.btn-sm {
  font-size: 0.8rem;
  padding: 0.35rem 0.65rem;
}

.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1rem; }

/* Disclaimer Footer */
.app-disclaimer {
  border-top: 2px solid var(--accent-subtle);
}

.disclaimer-heading {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.disclaimer-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Floating Visual Tweaks Bar (Phase 9 Protocol) */
.tweaks-bar {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
}

.tweaks-toggle-btn {
  background-color: var(--surface);
  color: var(--text-main);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.6);
  transition: var(--transition);
}

.tweaks-toggle-btn:hover {
  background-color: var(--accent);
  color: #000000;
}

.tweaks-content {
  display: none;
  background-color: #121518;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 0.5rem;
  width: 280px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

.tweaks-expanded .tweaks-content {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.tweaks-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
}

.tweak-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tweak-item input[type="color"] {
  background: none;
  border: none;
  width: 32px;
  height: 26px;
  cursor: pointer;
}

/* ==========================================================================
   Mobile Viewport Responsiveness Fix (Stage 2 Adversarial QA Vector 2)
   Prevents horizontal scrollbar overflow on mobile devices (320px–480px)
   ========================================================================== */
fieldset {
  min-width: 0;
}

@media (max-width: 768px) {
  .main-layout {
    padding: 1rem 0.75rem 3rem;
  }
  .workbench-grid, .control-panel, .visualizer-card, .table-card, .card-surface, .results-display {
    min-width: 0;
    max-width: 100%;
  }
  .input-row {
    flex-direction: column;
  }
  .canvas-wrapper {
    overflow-x: auto;
    max-width: 100%;
  }
  #tileSvg {
    max-width: 100%;
    height: auto;
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  .panel-header {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
}

/* ==========================================================================
   SEO Technical Guide Section Styling (TCNA & ANSI Reference)
   ========================================================================== */
.seo-guide-section {
  border-top: 1px solid var(--border-color);
  margin-top: 2rem;
}
.guide-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}
.guide-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.seo-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}
.guide-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm, 6px);
  padding: 1rem;
}
.guide-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.guide-card-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}