/* ==========================================================================
   1. Design Token System & Global Variables
   ========================================================================== */
:root {
  /* Common Core Tokens */
  --gf-radius-lg: 8px;
  --gf-radius-md: 6px;
  --gf-radius-sm: 4px;
  --gf-transition: all 0.2s ease;

  /* Light Theme Palette (Default Configuration) */
  --gf-light-bg: #ffffff;         /* Pure White Canvas */
  --gf-light-border: #969798;     /* Clean Outer Rim */
  --gf-light-text: #0f172a;       /* Dark Typography Ink */
  --gf-light-divider: #969798;     /* match border */

  /* Dark Theme Structural Palette (Premium Ice Blue / Pastel Sky Layout from Ordering) */
  --gf-dark-bg: #d8f1ff;          /* Soft Calming Pastel Sky/Ice Blue */
  --gf-dark-border: #42bbfc;      /* Clean Outer Rim Accent Border */
  --gf-dark-text: #0f172a;        /* High Contrast Reading Ink */
  --gf-dark-divider: #42bbfc;   /* match border */

  /* Validation Feedback System Tokens */
  --gf-correct-bg: #f0fdf4;
  --gf-correct-border: #22c55e;
  --gf-correct-text: #15803d;

  --gf-incorrect-bg: #fef2f2;
  --gf-incorrect-border: #ef4444;
  --gf-incorrect-text: #b91c1c;
}

/* ==========================================================================
   2. Component Base Structural Architecture
   ========================================================================== */
.gapfill-block {
  background-color: var(--gf-light-bg);
  border: 1px solid var(--gf-light-border);
  padding: 1.2em;
  margin-bottom: 1.5em;
  border-radius: var(--gf-radius-lg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
  transition: var(--gf-transition);
}

.gapfill-content {
  font-family: "Consolas", "Courier New", Courier, monospace;
  font-size: 1.05em;
  line-height: 2.2; /* Extra breathing room for nested dropdown text wrappers */
  color: var(--gf-light-text);
  margin: 0 0 1.5em 0;
  white-space: pre-wrap;
}

/* Base Wrapper for Inline Alignment */
.gapfill-wrapper {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.gapfill-input {
  display: inline-block;
  padding: 0.2em 0.4em;
  font-size: 0.95em;
  border: 1px solid #cbd5e1;
  border-radius: var(--gf-radius-sm);
  background-color: #f8fafc;
  color: #0f172a;
  outline: none;
  cursor: pointer;
  transition: var(--gf-transition);
}

/* Selected Input Dropdowns Modifiers */
.gapfill-input.correct {
  border-color: var(--gf-correct-border) !important;
  background-color: var(--gf-correct-bg) !important;
  color: var(--gf-correct-text) !important;
}

.gapfill-input.incorrect {
  border-color: var(--gf-incorrect-border) !important;
  background-color: var(--gf-incorrect-bg) !important;
  color: var(--gf-incorrect-text) !important;
}

/* Inline Verification Icon Embellishments */
.gapfill-inline-feedback {
  font-weight: 600;
  font-size: 0.95em;
  margin-left: 0.3em;
  margin-right: 0.3em;
}

.text-correct {
  color: var(--gf-correct-border);
}

.text-incorrect {
  color: var(--gf-incorrect-border);
}

/* ==========================================================================
   3. Unified Dark Theme Layout Inversions (Blocks & Layout Only)
   ========================================================================== */
.gapfill-block.theme-dark {
  background-color: var(--gf-dark-bg) !important;
  border-color: var(--gf-dark-border) !important;
}

.gapfill-block.theme-dark .gapfill-content {
  color: var(--gf-dark-text) !important;
}

/* ==========================================================================
   4. Control Interface Action Triggers & Toolbars
   ========================================================================== */

.gapfill-global-panel {
  display: flex;
  align-items: center;
  gap: 0.8em;
  margin-top: 1em;
  border-top: 1px solid var(--gf-light-divider);
  padding-top: 1em;
  transition: border-color 0.15s ease;
}

/* --- Theme Variant Modifiers --- */
/* Automatically apply dark line color when the panel sits inside a dark block */
.gapfill-block.theme-dark .gapfill-global-panel {
  border-top-color: var(--gf-dark-divider);
}

.gapfill-global-panel button {
  padding: 0.5em 1em;
  border-radius: var(--gf-radius-md);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.12s ease, transform 0.05s ease;
}

.gapfill-global-panel button:hover {
  filter: brightness(0.92);
}

.gapfill-global-panel button:active {
  transform: scale(0.97);
}

.gapfill-btn-score {
  background: #2563eb;
  color: white;
}

.gapfill-btn-reset {
  background: #f3f4f6;
  color: #4b5563;
  border: 1px solid #e5e7eb !important;
}

/* Score Panel Outputs */
.gapfill-output {
  margin-left: auto;
  font-weight: 700;
  padding: 0.4em 0.8em;
  border-radius: var(--gf-radius-md);
  display: none;
  border: 1px solid transparent;
}

.gapfill-output.high {
  background: var(--gf-correct-bg) !important;
  border-color: var(--gf-correct-border) !important;
  color: var(--gf-correct-text) !important;
}

.gapfill-output.medium {
  background: #fff7ed !important;
  border-color: #f59e0b !important;
  color: #9a3412 !important;
}

.gapfill-output.low {
  background: var(--gf-incorrect-bg) !important;
  border-color: var(--gf-incorrect-border) !important;
  color: var(--gf-incorrect-text) !important;
}