/* CSS Design System for Dachdecker-Flächenrechner */

/* Reset & Fonts */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
  /* Color Palette - Roof Tile Orange & Slate Gray */
  --hue-primary: 18; /* Terracotta Orange */
  --hue-secondary: 215; /* Slate Blue/Gray */
  
  --primary-color: hsl(var(--hue-primary), 90%, 58%);
  --primary-hover: hsl(var(--hue-primary), 95%, 48%);
  --primary-glow: hsla(var(--hue-primary), 90%, 58%, 0.15);
  
  --success-color: hsl(142, 70%, 45%);
  --info-color: hsl(200, 80%, 45%);
  
  --transition-speed: 0.3s;
  --transition-bezier: cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-lg: 8px;
  --border-radius-md: 8px;
  --border-radius-sm: 8px;
}

/* Theme variables */
[data-theme="dark"] {
  --bg-app: hsl(var(--hue-secondary), 25%, 8%);
  --bg-glass: rgba(18, 24, 37, 0.65);
  --bg-glass-hover: rgba(24, 32, 50, 0.75);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-active: hsla(var(--hue-primary), 90%, 58%, 0.4);
  --text-main: hsl(0, 0%, 93%);
  --text-muted: hsl(var(--hue-secondary), 15%, 65%);
  --text-inverse: hsl(var(--hue-secondary), 25%, 8%);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --glow-opacity: 0.45;
  --math-bg: rgba(0, 0, 0, 0.25);
  --sidebar-active-bg: hsla(var(--hue-primary), 90%, 58%, 0.12);
  --badge-bg: hsla(var(--hue-primary), 90%, 58%, 0.15);
  --badge-text: hsl(var(--hue-primary), 100%, 75%);
}

[data-theme="light"] {
  --bg-app: hsl(var(--hue-secondary), 20%, 95%);
  --bg-glass: rgba(255, 255, 255, 0.75);
  --bg-glass-hover: rgba(255, 255, 255, 0.85);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-active: hsla(var(--hue-primary), 90%, 58%, 0.5);
  --text-main: hsl(var(--hue-secondary), 35%, 15%);
  --text-muted: hsl(var(--hue-secondary), 15%, 45%);
  --text-inverse: hsl(0, 0%, 98%);
  --shadow-color: rgba(0, 0, 0, 0.05);
  --glow-opacity: 0.2;
  --math-bg: rgba(255, 255, 255, 0.5);
  --sidebar-active-bg: hsla(var(--hue-primary), 90%, 58%, 0.08);
  --badge-bg: hsla(var(--hue-primary), 90%, 58%, 0.1);
  --badge-text: hsl(var(--hue-primary), 85%, 45%);
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-speed) var(--transition-bezier),
              color var(--transition-speed) var(--transition-bezier);
}

.glow-bg {
  position: fixed;
  width: 56vw;
  height: 56vw;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: var(--glow-opacity);
  transition: opacity var(--transition-speed);
}

.glow-orange {
  top: -10%;
  right: -10%;
  background: radial-gradient(circle, hsla(var(--hue-primary), 90%, 58%, 0.3) 0%, transparent 70%);
}

.glow-slate {
  bottom: -10%;
  left: -10%;
  background: radial-gradient(circle, hsla(var(--hue-secondary), 50%, 50%, 0.25) 0%, transparent 70%);
}

/* Layout Container */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  gap: 1.5rem;
}

/* Glassmorphism Panel Base */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 8px 32px 0 var(--shadow-color);
  transition: background var(--transition-speed) var(--transition-bezier),
              border-color var(--transition-speed) var(--transition-bezier),
              box-shadow var(--transition-speed) var(--transition-bezier);
}

.glass-panel:hover {
  background: var(--bg-glass-hover);
}

/* Header Styles */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
}

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

.logo-icon {
  background: var(--primary-color);
  color: var(--text-inverse);
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.logo-text h1 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0;
}

.logo-text h1 .highlight {
  color: var(--primary-color);
  margin-left: 2px;
}

.logo-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: scale(1.05);
}

/* Theme Switcher Toggle */
.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

/* Main Layout Grid */
.main-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* Sidebar Styling */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-section {
  padding: 0.5rem 0.25rem;
}

.sidebar-section h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.category-tabs {
  display: flex;
  gap: 4px;
  background: rgba(0,0,0,0.1);
  padding: 4px;
  border-radius: var(--border-radius-sm);
  margin-bottom: 0.5rem;
}

.cat-tab {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 0;
  border-radius: calc(var(--border-radius-sm) - 2px);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.cat-tab.active, .cat-tab:hover {
  background: var(--bg-glass);
  color: var(--text-main);
  box-shadow: 0 2px 8px var(--shadow-color);
}

/* Navigation items */
.roof-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.group-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  font-weight: 700;
  padding-left: 0.75rem;
  margin-bottom: 0.25rem;
}

.roof-menu-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s var(--transition-bezier);
  min-height: 46px;
}

.roof-menu-item:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-color);
  padding-left: 16px;
}

.roof-menu-item.active {
  color: var(--primary-color);
  background: var(--sidebar-active-bg);
  border-color: var(--border-color-active);
  font-weight: 600;
  box-shadow: inset 0 0 10px rgba(224, 90, 54, 0.05);
}

.roof-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  background: rgba(0,0,0,0.15);
  color: var(--text-muted);
  transition: all 0.2s;
}

.roof-menu-item.active .roof-icon {
  background: var(--primary-color);
  color: var(--text-inverse);
}

/* Dashboard Layout */
.dashboard {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Top Information Card */
.roof-info-card {
  padding: 1.5rem 2rem;
}

.info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.info-header h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

.badge {
  background: var(--badge-bg);
  color: var(--badge-text);
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#roof-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.5;
}

.roof-quick-stat {
  text-align: right;
  min-width: 150px;
}

.stat-value {
  font-family: 'Outfit', sans-serif;
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-color);
  line-height: 1.1;
  text-shadow: 0 4px 20px var(--primary-glow);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* Playground Grid */
.playground-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

/* Panel Header styling */
.panel-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-header h3 i {
  color: var(--primary-color);
  width: 18px;
  height: 18px;
}

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

.hint-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Inputs Form Layout */
.panel-inputs {
  grid-column: 1;
}

.calc-form {
  padding: 1.5rem;
}

.inputs-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Custom Input Groups */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.input-label-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.input-val-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-color);
  background: var(--badge-bg);
  padding: 2px 8px;
  border-radius: var(--border-radius-sm);
}

.input-control-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

/* Range Slider Styling */
.input-control-row input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
  transition: background 0.3s;
}

.input-control-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: 2px solid var(--bg-app);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.1s, background-color 0.2s;
}

.input-control-row input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--primary-hover);
}

.input-control-row input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: 2px solid var(--bg-app);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.1s, background-color 0.2s;
}

.input-control-row input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.15);
  background: var(--primary-hover);
}

/* Visualizer Canvas */
.panel-visualizer {
  grid-column: 2;
  display: flex;
  flex-direction: column;
}

.visualizer-container {
  flex: 1;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  position: relative;
}

#svg-sketch {
  max-height: 320px;
}

/* SVG Line and Text Styling */
.svg-outline {
  fill: none;
  stroke: var(--text-main);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.svg-fill-primary {
  fill: hsla(var(--hue-primary), 90%, 58%, 0.12);
  stroke: var(--primary-color);
  stroke-width: 2.5;
  transition: all 0.3s;
}

.svg-fill-secondary {
  fill: hsla(var(--hue-secondary), 25%, 50%, 0.1);
  stroke: var(--text-muted);
  stroke-width: 1.5;
}

.svg-dimension-line {
  stroke: var(--primary-color);
  stroke-width: 1.5;
  stroke-dasharray: 3 3;
}

.svg-dimension-text {
  fill: var(--primary-color);
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  text-anchor: middle;
}

.svg-label {
  fill: var(--text-muted);
  font-size: 10px;
  font-weight: 500;
}

/* Highlight input-correlated svg elements on hover */
.svg-highlightable {
  cursor: pointer;
}

.svg-highlightable:hover {
  stroke-width: 4px;
  filter: drop-shadow(0 0 4px var(--primary-color));
}

/* Mathematics Section */
.panel-math {
  grid-column: 1;
}

.math-container {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.formula-block {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--math-bg);
  padding: 1rem 1.25rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
}

.formula-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.formula-math {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-color);
  overflow-wrap: anywhere;
}

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

.step-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 1rem;
  border-left: 2px solid var(--border-color);
}

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

.step-math {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.step-math span.math-res {
  color: var(--primary-color);
  font-weight: 700;
}

/* Theory & Tips section */
.panel-theory {
  grid-column: 2;
}

.theory-container {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.theory-list,
.theory-definition {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.theory-list dt,
.theory-definition dt {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--primary-color);
}

.theory-list dd,
.theory-definition dd {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 0;
  line-height: 1.4;
  margin-bottom: 0.4rem;
}

.practice-tip-box {
  background: hsla(142, 70%, 45%, 0.08);
  border: 1px solid hsla(142, 70%, 45%, 0.2);
  color: hsl(142, 70%, 45%);
  padding: 1rem;
  border-radius: var(--border-radius-md);
  display: flex;
  gap: 0.75rem;
  font-size: 0.8rem;
  line-height: 1.5;
}

[data-theme="dark"] .practice-tip-box {
  color: hsl(142, 80%, 75%);
}

.practice-tip-box i {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

/* Responsive Styling */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    background: var(--bg-glass);
    padding: 1rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
  }
  
  .sidebar-section {
    width: 100%;
    margin-bottom: 0;
  }
  
  .roof-nav {
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
  }
  
  .nav-group {
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
  }
  
  .group-title {
    width: 100%;
    margin-top: 0.5rem;
  }
  
  .roof-menu-item {
    width: calc(33.333% - 8px);
    justify-content: flex-start;
  }
}

@media (max-width: 768px) {
  .app-container {
    padding: 0.75rem;
  }

  .app-header {
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
  }

  .header-logo {
    align-items: flex-start;
  }

  .logo-icon {
    width: 38px;
    height: 38px;
    flex: 0 0 38px;
  }

  .logo-text h1 {
    font-size: 1.05rem;
  }

  .logo-text p {
    font-size: 0.72rem;
  }
  
  .playground-grid {
    grid-template-columns: 1fr;
  }
  
  .panel-inputs, .panel-visualizer, .panel-math, .panel-theory {
    grid-column: 1;
  }
  
  .roof-menu-item {
    width: calc(50% - 4px);
  }
  
  .info-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .roof-quick-stat {
    text-align: left;
  }

  .stat-value {
    font-size: 1.85rem;
  }

  .flex-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .visualizer-container {
    min-height: 240px;
    padding: 0.75rem;
  }

  .math-container,
  .theory-container,
  .calc-form {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  .roof-menu-item {
    width: 100%;
  }
  
  .category-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .input-label-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .roof-info-card {
    padding: 1rem;
  }

  .panel-header {
    padding: 1rem;
  }
}