/* ═══════════════════════════════════════════════════════════════════════
   Robo-Text De-AI-ifier — Humanizer
   Dark-first theme with light mode toggle
   ═══════════════════════════════════════════════════════════════════════ */

/* ── CSS Variables ────────────────────────────────────────────────────── */
:root {
  /* Dark theme (default) */
  --bg-primary: #0d0f13;
  --bg-secondary: #141820;
  --bg-card: #1a1f2b;
  --bg-input: #12151c;
  --bg-hover: #242a38;
  --bg-glass: rgba(26, 31, 43, 0.85);

  --border-primary: #2a3040;
  --border-focus: #6366f1;
  --border-glow: rgba(99, 102, 241, 0.3);

  --text-primary: #e8eaf0;
  --text-secondary: #9ca3b4;
  --text-muted: #6b7280;
  --text-accent: #818cf8;

  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --accent-glow: rgba(99, 102, 241, 0.15);

  --score-safe: #10b981;
  --score-warn: #f59e0b;
  --score-danger: #ef4444;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f1f3f7;
  --bg-hover: #e8eaf0;
  --bg-glass: rgba(255, 255, 255, 0.9);

  --border-primary: #e2e5eb;
  --border-focus: #6366f1;
  --border-glow: rgba(99, 102, 241, 0.2);

  --text-primary: #1a1d27;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --text-accent: #6366f1;

  --accent-glow: rgba(99, 102, 241, 0.1);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.08);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-normal), color var(--transition-normal);
}

/* ── Layout ───────────────────────────────────────────────────────────── */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--border-primary);
  margin-bottom: 32px;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-logo .logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: var(--shadow-glow);
}

.app-logo h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-logo .subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Buttons ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-family: var(--font-sans);
}

.btn:hover {
  background: var(--bg-hover);
  border-color: var(--border-focus);
}

.btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.btn-icon:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ── Main Grid ──────────────────────────────────────────────────────── */
.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Card / Panel ───────────────────────────────────────────────────── */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.panel:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--border-glow);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-secondary);
}

.panel-title {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.panel-actions {
  display: flex;
  gap: 6px;
}

.text-area {
  width: 100%;
  min-height: 320px;
  padding: 18px;
  background: var(--bg-input);
  border: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.7;
  resize: vertical;
  font-family: var(--font-sans);
  transition: background var(--transition-normal);
}

.text-area:focus {
  outline: none;
  background: var(--bg-card);
}

.text-area::placeholder {
  color: var(--text-muted);
}

.text-area.output {
  background: var(--bg-input);
  color: var(--text-primary);
  cursor: default;
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.char-count {
  padding: 8px 18px;
  border-top: 1px solid var(--border-primary);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: right;
  background: var(--bg-secondary);
}

/* ── Controls Bar ────────────────────────────────────────────────────── */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.intensity-selector {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: 4px;
  gap: 2px;
}

.intensity-btn {
  padding: 8px 18px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.intensity-btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.intensity-btn.active {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.intensity-btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 1px;
}

/* ── Score Dashboard ──────────────────────────────────────────────────── */
.dashboard {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (max-width: 900px) {
  .dashboard {
    grid-template-columns: 1fr;
  }
}

.score-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.score-gauge-wrap {
  position: relative;
  width: 180px;
  height: 100px;
}

.score-gauge-wrap svg {
  width: 100%;
  height: 100%;
}

.gauge-bg {
  fill: none;
  stroke: var(--border-primary);
  stroke-width: 12;
  stroke-linecap: round;
}

.gauge-fill {
  fill: none;
  stroke-width: 12;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.4, 0, 0.2, 1),
              stroke 0.5s ease;
  filter: drop-shadow(0 0 6px currentColor);
}

.gauge-text {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  fill: var(--text-primary);
  text-anchor: middle;
  dominant-baseline: middle;
}

.gauge-label {
  font-family: var(--font-sans);
  font-size: 11px;
  fill: var(--text-muted);
  text-anchor: middle;
  dominant-baseline: middle;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.score-verdict {
  font-size: 0.9rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  text-align: center;
}

.score-verdict.safe {
  background: rgba(16, 185, 129, 0.15);
  color: var(--score-safe);
}

.score-verdict.warn {
  background: rgba(245, 158, 11, 0.15);
  color: var(--score-warn);
}

.score-verdict.danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--score-danger);
}

/* ── Stats Cards ─────────────────────────────────────────────────────── */
.stats-panel {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  align-content: start;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: border-color var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-focus);
}

.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-bar {
  height: 4px;
  background: var(--border-primary);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
}

.stat-bar-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.6s ease, background 0.5s ease;
}

/* ── Markers Panel ──────────────────────────────────────────────────── */
.markers-section {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.markers-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-secondary);
}

.markers-title {
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.markers-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-hover);
  padding: 3px 10px;
  border-radius: 10px;
}

.markers-list {
  max-height: 360px;
  overflow-y: auto;
  padding: 8px;
}

.marker-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.marker-item:hover {
  background: var(--bg-hover);
}

.marker-badge {
  min-width: 32px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.marker-badge.sev-1 { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
.marker-badge.sev-2 { background: rgba(239, 68, 68, 0.12); color: #ef4444; }
.marker-badge.sev-3 { background: rgba(239, 68, 68, 0.2); color: #f87171; }

.marker-info {
  flex: 1;
  min-width: 0;
}

.marker-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.marker-reason {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.marker-samples {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.marker-sample {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  background: var(--bg-hover);
  color: var(--text-accent);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ── Diff View ────────────────────────────────────────────────────────── */
.diff-section {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-top: 24px;
}

.diff-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-primary);
  background: var(--bg-secondary);
}

.diff-content {
  padding: 18px;
  font-size: 0.9rem;
  line-height: 1.8;
  max-height: 400px;
  overflow-y: auto;
}

.diff-removed {
  background: rgba(239, 68, 68, 0.12);
  color: #f87171;
  text-decoration: line-through;
  border-radius: 3px;
  padding: 1px 4px;
}

.diff-added {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border-radius: 3px;
  padding: 1px 4px;
}

/* ── Empty States ─────────────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-muted);
  gap: 12px;
}

.empty-state .icon {
  font-size: 2.5rem;
  opacity: 0.4;
}

.empty-state .text {
  font-size: 0.9rem;
}

/* ── Animations ──────────────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.animate-in {
  animation: fadeIn 0.3s ease forwards;
}

.processing .btn-primary {
  animation: pulse 1s ease infinite;
}

/* ── Reduced Motion ─────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── Scrollbar ──────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ── Tooltip ──────────────────────────────────────────────────────────── */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  font-size: 0.72rem;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 100;
}

[data-tooltip]:hover::after {
  opacity: 1;
}

/* ── Footer ───────────────────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  padding: 32px 0 16px;
  border-top: 1px solid var(--border-primary);
  color: var(--text-muted);
  font-size: 0.78rem;
}

.app-footer a {
  color: var(--text-accent);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* ── Loading Spinner ────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}