/* Design System Variables - Corporate Modern / Minimalist */
:root{
  /* Surface Colors */
  --surface: #f8f9ff;
  --surface-dim: #cbdbf5;
  --surface-bright: #f8f9ff;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #eff4ff;
  --surface-container: #e5eeff;
  --surface-container-high: #dce9ff;
  --surface-container-highest: #d3e4fe;
  
  /* Text Colors */
  --on-surface: #0b1c30;
  --on-surface-variant: #424754;
  --inverse-surface: #213145;
  --inverse-on-surface: #eaf1ff;
  
  /* Border & Outline */
  --outline: #727785;
  --outline-variant: #c2c6d6;
  --border: #e2e8f0;
  
  /* Primary - Tech Blue */
  --primary: #3B82F6;
  --primary-hover: #2563eb;
  --primary-container: #2170e4;
  --on-primary: #ffffff;
  --on-primary-container: #fefcff;
  --inverse-primary: #adc6ff;
  
  /* Secondary */
  --secondary: #545f73;
  --on-secondary: #ffffff;
  --secondary-container: #d5e0f8;
  --on-secondary-container: #586377;
  
  /* Error */
  --error: #ba1a1a;
  --on-error: #ffffff;
  --error-container: #ffdad6;
  --on-error-container: #93000a;
  
  /* Spacing System (8px base) */
  --spacing-xs: 4px;
  --spacing-base: 8px;
  --spacing-sm: 12px;
  --spacing-gutter: 16px;
  --spacing-margin: 24px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 64px;
  
  /* Border Radius (8px standard) */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
}

/* Reset & Base */
*{ box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0;
  background: var(--surface);
  color: var(--on-surface);
}

a{ 
  color: var(--primary); 
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover{ color: var(--primary-hover); }

code{
  font-family: 'Inter', ui-monospace, monospace;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  background: var(--surface-container);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* Layout */
.wrap{
  max-width: 1200px;
  padding: var(--spacing-margin) var(--spacing-gutter) var(--spacing-xl);
  margin: 0 auto;
}

/* Header - Match Home Page */
.site-topbar{
  padding-top: 4px;
}

.site-topbar-inner{
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-radius: 12px;
  border: 1px solid rgb(226 232 240 / 0.8);
  background: rgb(255 255 255 / 0.9);
  padding: 16px 20px;
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-brand{
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-brand-mark{
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid #adc6ff;
  background: #d8e2ff;
  color: #0058be;
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.site-brand-logo{
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.site-brand-copy{
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-brand-title{
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: #0b1c30;
}

.site-brand-subtitle{
  font-size: 14px;
  line-height: 1.5;
  color: #424754;
}

.site-nav-wrap{
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-nav{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.site-nav-link{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  padding: 8px 12px;
  color: #424754;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.25rem;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav-link:hover{
  background: rgb(216 226 255 / 0.6);
  color: #0058be;
}

.site-nav-link[aria-current="page"]{
  background: rgb(216 226 255 / 0.6);
  color: #0058be;
}

.site-google-auth-link{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 40px;
  border: 1px solid #dadce0;
  border-radius: 9999px;
  background: #ffffff;
  padding: 9px 14px;
  color: #1f1f1f;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.25rem;
  box-shadow: 0 1px 2px rgb(60 64 67 / 0.3);
  transition: border-color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

.site-google-auth-link:hover{
  color: #1f1f1f;
  background: #f8f9fa;
  border-color: #d2e3fc;
  box-shadow: 0 2px 4px rgb(60 64 67 / 0.3);
}

.site-google-auth-link[aria-current="page"]{
  color: #1f1f1f;
  background: #ffffff;
  border-color: #8ab4f8;
  box-shadow: 0 0 0 3px rgb(66 133 244 / 0.15);
}

.site-google-auth-link svg{
  width: 18px;
  height: 18px;
  flex: none;
}

.site-google-auth-link span{
  white-space: nowrap;
}

@media (min-width: 768px){
  .site-topbar-inner{
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .site-nav-wrap{
    flex-direction: row;
    align-items: center;
  }
}

/* Grid Layout - 12 Column System */
.grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-margin);
  margin-top: var(--spacing-margin);
}

@media (min-width: 880px){
  .grid{ grid-template-columns: 1fr 1fr; }
}

/* Cards - Level 1 Surface */
.card{
  background: var(--surface-container-lowest);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-margin);
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.card h2{
  margin: 0 0 var(--spacing-gutter);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--on-surface);
}

.muted{ 
  color: var(--on-surface-variant); 
}

/* Buttons - Primary Action */
button, .btn{
  appearance: none;
  border: none;
  background: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius);
  padding: 12px var(--spacing-margin);
  cursor: pointer;
  font-family: inherit;
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  transition: background 0.15s ease;
  box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}
button:hover{
  background: var(--primary-hover);
}
button:disabled{
  opacity: 0.5;
  cursor: not-allowed;
}

/* Forms */
.form{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-gutter);
}

.field{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
}

.tool-panel{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-gutter);
  padding: var(--spacing-gutter);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-container-low);
}

.panel-title{
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

label{
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--on-surface);
}

/* Input Fields - 8px Rounded with Focus State */
input, select{
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-family: inherit;
  font-size: 16px;
  outline: none;
  transition: all 0.15s ease;
}

input:focus, select:focus{
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

input[type="color"]{
  min-height: 44px;
  padding: 6px;
  cursor: pointer;
}

/* Sliders - Thin Track with Solid Thumb */
input[type="range"]{
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  background: var(--border);
  border: none;
  padding: 0;
}

input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--surface-container-lowest);
  border: 2px solid var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 4px -1px rgb(0 0 0 / 0.1);
}

input[type="range"]::-moz-range-thumb{
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--surface-container-lowest);
  border: 2px solid var(--primary);
  cursor: pointer;
  box-shadow: 0 2px 4px -1px rgb(0 0 0 / 0.1);
}

/* Tool List */
.tool-list{
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
}

.tool-item{
  padding: var(--spacing-gutter);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-container-lowest);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--spacing-sm);
  transition: all 0.15s ease;
}

.tool-item:hover{
  border-color: var(--outline);
}

.tool-item .left{
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.tool-item .left .name{
  font-weight: 600;
  color: var(--on-surface);
}

.tool-item .left .desc{
  font-size: 14px;
  line-height: 1.5;
  color: var(--on-surface-variant);
}

/* Preview - Sharp Corners for Raw Asset */
.preview{
  width: 100%;
  border-radius: 0;
  border: 1px solid var(--border);
  background: var(--surface-container-low);
  overflow: hidden;
  min-height: 260px;
}

.preview img{
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: contain;
}

/* Utility */
.row{
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.note{
  font-size: 14px;
  line-height: 1.5;
  color: var(--on-surface-variant);
}

/* Error State */
.error{
  border: 1px solid var(--error);
  background: var(--error-container);
  padding: 12px var(--spacing-gutter);
  border-radius: var(--radius);
  color: var(--on-error-container);
  font-size: 14px;
  line-height: 1.5;
  white-space: pre-wrap;
}