/* ======================================================
   SOLARPUNK NEUMORPHIC THEME
   Palette: Warm Cream, Terracotta, Moss Green, Sun Yellow
   ====================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  /* Color Palette */
  --bg-color: #f3efe6;          /* Warm sandstone / recycled pulp texture base */
  --card-bg: #f3efe6;
  --text-main: #2d3b2d;        /* Deep chlorophyll charcoal */
  --text-muted: #6b7a6b;       /* Soft lichen grey-green */
  
  --accent-green: #3a7d44;     /* Lush foliage green */
  --accent-amber: #d97706;     /* Golden hour sun */
  --accent-terracotta: #c85a32;/* Clay tile red */
  
  /* Neumorphic Dual-Shadow Systems */
  /* Convex / Flat element shadows */
  --neu-flat-shadow: 
    8px 8px 16px #d8d4cb, 
    -8px -8px 16px #ffffff;
  
  --neu-flat-hover: 
    12px 12px 20px #cdc9c0, 
    -12px -12px 20px #ffffff;

  /* Pressed / Inset container shadows */
  --neu-pressed-shadow: 
    inset 4px 4px 8px #d1cdb3, 
    inset -4px -4px 8px #ffffff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 10% 10%, rgba(58, 125, 68, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(217, 119, 6, 0.05) 0%, transparent 40%);
  color: var(--text-main);
  margin: 0;
  padding: 20px 12px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

/* Outer Card Container */
.calculator-card {
  background: var(--card-bg);
  border-radius: 28px;
  max-width: 680px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 20px;
  box-shadow: var(--neu-flat-shadow);
  border: 1px solid rgba(255, 255, 255, 0.6);
  position: relative;
  overflow: hidden;
}

/* Decorative Solarpunk Top Accent Bar */
.calculator-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-amber), var(--accent-terracotta));
}

header h1 {
  margin: 0 0 6px 0;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

header p {
  margin: 0 0 24px 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Fieldset Sectioning */
fieldset {
  border: none;
  border-radius: 20px;
  padding: 24px 24px 20px 24px;
  margin-bottom: 24px;
  background: var(--card-bg);
  box-shadow: var(--neu-flat-shadow);
  display: flex;
  flex-direction: column;
}

/* Position Legend Cleanly Inside the Border/Shadow Boundary */
legend {
  float: left;
  width: 100%;
  margin-bottom: 16px;
  padding: 0;
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-green);
}

/* Form Controls & Labels */
.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 18px;
  width: 100%;
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
  text-align: left;
}

/* Neumorphic Inset Inputs & Selects */
input, select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--card-bg);
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 0.95rem;
  color: var(--text-main);
  box-shadow: var(--neu-pressed-shadow);
  outline: none;
  transition: all 0.2s ease;
  width: 100%;
  max-width: 100%;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

input:focus, select:focus {
  box-shadow: 
    inset 4px 4px 8px #d1cdb3, 
    inset -4px -4px 8px #ffffff,
    0 0 0 2px var(--accent-green);
}

/* Results Display Panel */
.results-panel {
  margin-top: 24px;
  padding: 20px;
  border-radius: 20px;
  background: var(--card-bg);
  box-shadow: var(--neu-flat-shadow);
  width: 100%;
}

.results-panel h2 {
  margin: 0 0 16px 0;
  font-size: 1.2rem;
  color: var(--text-main);
}

/* Tube Health Status Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: var(--neu-flat-shadow);
  margin-bottom: 20px;
}

/* Results Grid Boxes */
.grid-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
}

.result-box {
  background: var(--card-bg);
  padding: 16px 12px;
  border-radius: 16px;
  text-align: center;
  box-shadow: var(--neu-pressed-shadow);
}

.result-box .label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-box .value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-green);
  margin: 6px 0 2px 0;
}

.result-box .unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Alerts & Fail-safe Banner */
.alert-box {
  margin-top: 20px;
  padding: 14px 18px;
  border-radius: 14px;
  font-size: 0.875rem;
  line-height: 1.45;
  box-shadow: var(--neu-flat-shadow);
}

.alert-box.warning {
  background-color: #fef3c7;
  color: #854d0e;
  border-left: 4px solid var(--accent-amber);
}

.alert-box.danger {
  background-color: #fee2e2;
  color: #991b1b;
  border-left: 4px solid var(--accent-terracotta);
}

.hidden {
  display: none !important;
}