/* ==========================================================================
   LFSR STREAM CIPHER STUDIO - CRAFTED DESIGN SYSTEM (antislop compliant)
   Archetype: Cryptographic Laboratory Instrument
   Guidelines: DESIGN.md • WCAG AA 4.5:1+ • Zero AI slop / no gratuitous glow
   ========================================================================== */

/* 1. Theme Variables & Base Color Tokens */
:root {
  /* Dark Workbench (Default) */
  --bg-page: #090e17;
  --bg-surface: #121927;
  --bg-surface-elevated: #182235;
  --bg-well: #0c121d;
  
  --border-subtle: #1e2b40;
  --border-strong: #2a3b56;
  --border-focus: #38bdf8;
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;   /* 11.2:1 contrast against surface - WCAG AAA */
  --text-muted: #94a3b8;       /* 6.48:1 contrast against surface - WCAG AA */
  
  /* Purpose-Driven Accents */
  --accent-action: #2563eb;
  --accent-action-hover: #1d4ed8;
  --accent-stream: #d97706;
  --accent-stream-light: #fbbf24;
  --accent-pass: #059669;
  --accent-pass-text: #34d399;
  --accent-fail: #dc2626;
  --accent-fail-text: #f87171;
  
  /* Geometry */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;
}

/* Light Workbench (Classroom Projector Mode) */
body.theme-light {
  --bg-page: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-well: #e2e8f0;
  
  --border-subtle: #cbd5e1;
  --border-strong: #94a3b8;
  --border-focus: #2563eb;
  
  --text-primary: #0f172a;     /* >14:1 contrast */
  --text-secondary: #334155;   /* 8.5:1 contrast */
  --text-muted: #64748b;       /* 4.6:1 contrast - WCAG AA */
  
  --accent-action: #2563eb;
  --accent-action-hover: #1d4ed8;
  --accent-stream: #b45309;
  --accent-stream-light: #92400e;
  --accent-pass: #059669;
  --accent-pass-text: #065f46;
  --accent-fail: #b91c1c;
  --accent-fail-text: #991b1b;
}

/* Base Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.15s ease, color 0.15s ease;
}

/* Typography Utility */
.font-mono {
  font-family: var(--font-mono);
}

.font-sans {
  font-family: var(--font-sans);
}

/* Container */
.app-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem 1rem;
}

/* Instrument Header */
.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.brand-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  background-color: var(--bg-well);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin-left: 0.5rem;
  vertical-align: middle;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary) !important;
  margin: 0;
  line-height: 1.2;
}

.app-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted) !important;
  margin-top: 0.2rem;
}

.preset-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary) !important;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background-color 0.15s;
}

.theme-toggle-btn:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

/* Keyboard Accessibility - Focus Rings (R-32) */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Workbench Panel / Card */
.workbench-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Tabs Navigation (WAI-ARIA Pattern) */
.nav-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  background-color: var(--bg-well);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  margin-bottom: 1.5rem;
}

.nav-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.nav-tab-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-elevated);
}

.nav-tab-btn.active {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

/* Tab Panels */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Form Controls */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  background-color: var(--bg-well);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.75rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: border-color 0.15s;
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--border-focus);
}

.form-input.is-invalid, .form-textarea.is-invalid {
  border-color: var(--accent-fail);
}

.field-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* Validation Messages */
.validation-error {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-fail-text);
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.35rem;
}

.validation-warning {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-stream);
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.35rem;
}

/* Buttons - Solid, Purposeful, Zero AI Gradient Slop */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.btn-primary {
  background-color: var(--accent-action);
  color: #ffffff;
  border-color: var(--accent-action);
}

.btn-primary:hover {
  background-color: var(--accent-action-hover);
  border-color: var(--accent-action-hover);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  background-color: var(--bg-well);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-success {
  background-color: var(--accent-pass);
  color: #ffffff;
  border-color: var(--accent-pass);
}

.btn-success:hover {
  background-color: #047857;
}

.btn-danger {
  background-color: var(--accent-fail);
  color: #ffffff;
  border-color: var(--accent-fail);
}

.btn-danger:hover {
  background-color: #b91c1c;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
}

/* Status Badges - Rectangular & Semantic */
.status-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-tag-pass {
  background-color: rgba(5, 150, 105, 0.15);
  color: var(--accent-pass-text);
  border: 1px solid rgba(5, 150, 105, 0.4);
}

.status-tag-fail {
  background-color: rgba(220, 38, 38, 0.15);
  color: var(--accent-fail-text);
  border: 1px solid rgba(220, 38, 38, 0.4);
}

.status-tag-neutral {
  background-color: var(--bg-well);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.status-tag-amber {
  background-color: rgba(217, 119, 6, 0.15);
  color: var(--accent-stream);
  border: 1px solid rgba(217, 119, 6, 0.4);
}

.status-tag-id {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.status-tag-blue {
  background-color: rgba(37, 99, 235, 0.12);
  color: var(--accent-action);
  border: 1px solid rgba(37, 99, 235, 0.35);
}

/* Bitwise breakdown token colors */
.bit-plain {
  color: #0284c7;
}
body:not(.theme-light) .bit-plain {
  color: #38bdf8;
}

.bit-key {
  color: var(--accent-pass-text);
}

.bit-cipher {
  color: var(--accent-stream);
}
body:not(.theme-light) .bit-cipher {
  color: var(--accent-stream-light);
}

/* Preset Chips - Rectangular, Not Pill */
.preset-chip {
  padding: 0.35rem 0.65rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.preset-chip:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

/* Keystream Stream Display Box */
.keystream-box {
  background-color: var(--bg-well);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  overflow-x: auto;
  white-space: nowrap;
  min-height: 46px;
  display: flex;
  align-items: center;
}

/* Precision Data Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  background-color: var(--bg-well);
  color: var(--text-muted);
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 5;
}

.data-table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.data-table tbody tr:hover {
  background-color: var(--bg-surface-elevated);
}

/* Circuit Schematic Container */
.circuit-frame {
  width: 100%;
  overflow-x: auto;
  background-color: var(--bg-well);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
}

/* Technical Specification Cards */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.spec-cell {
  background-color: var(--bg-well);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.spec-cell-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.spec-cell-value {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.spec-cell-desc {
  font-size: 0.725rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Toast Container */
#toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 0.65rem 1rem;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ==========================================================================
   CIRCUIT BIT FLOW (Animasi Aliran Angka Tenang Tanpa Kedip)
   ========================================================================== */

/* Bit Packet Particle in Signal Layer */
.bit-packet {
  pointer-events: none;
}

/* ==========================================================================
   LIGHT MODE SAFETY OVERRIDES (Guarantee High Contrast in Classroom Mode)
   ========================================================================== */

body.theme-light .text-white,
body.theme-light .text-slate-100,
body.theme-light .text-slate-200 {
  color: var(--text-primary) !important;
}

body.theme-light .text-slate-300,
body.theme-light .text-slate-400 {
  color: var(--text-secondary) !important;
}

body.theme-light .text-slate-500 {
  color: var(--text-muted) !important;
}

body.theme-light .bg-slate-900,
body.theme-light .bg-slate-950 {
  background-color: var(--bg-well) !important;
}

body.theme-light .bg-slate-900\/60 {
  background-color: var(--bg-well) !important;
}

body.theme-light .bg-emerald-950\/40,
body.theme-light .bg-emerald-950\/60 {
  background-color: rgba(5, 150, 105, 0.12) !important;
  color: var(--accent-pass-text) !important;
}

body.theme-light .border-slate-800,
body.theme-light .border-slate-700 {
  border-color: var(--border-subtle) !important;
}

body.theme-light .border-emerald-500\/40,
body.theme-light .border-emerald-500\/50 {
  border-color: rgba(5, 150, 105, 0.35) !important;
}


.xor-stepper-header {
  flex-wrap: wrap;
  gap: 0.75rem;
}

.xor-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.xor-controls .btn {
  min-height: 44px;
}

.xor-controls .btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.xor-progress {
  min-width: 6rem;
  text-align: center;
  font: 700 0.8rem var(--font-mono);
  color: var(--text-secondary);
}

.xor-byte-label {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
}

.xor-row {
  margin-top: 0.85rem;
}

.xor-row-label {
  margin-bottom: 0.3rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
}

.xor-bits {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0.35rem;
}

.xor-bit {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 2.5rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background-color: var(--bg-well);
  color: var(--text-primary);
  font: 700 1rem var(--font-mono);
}

.xor-row-key .xor-bit {
  color: var(--accent-stream-light);
}

.xor-row-output .xor-bit {
  color: var(--accent-pass-text);
}

.xor-bit.is-current {
  outline: 2px solid var(--border-focus);
  outline-offset: 1px;
  background-color: var(--bg-surface-elevated);
}

.xor-bit.is-pending {
  color: var(--text-muted);
}

.xor-formula {
  margin-top: 1rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: var(--bg-well);
  color: var(--text-primary);
  font: 700 0.85rem var(--font-mono);
}

@media (max-width: 640px) {
  .xor-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    width: 100%;
    gap: 0.4rem;
  }

  .xor-controls [data-xor-auto] {
    grid-column: 1 / -1;
  }

  .xor-controls .btn {
    padding: 0.45rem 0.5rem;
    font-size: 0.75rem;
  }

  .xor-progress {
    min-width: 4.5rem;
    font-size: 0.72rem;
  }

  .xor-bit {
    min-height: 2rem;
    font-size: 0.85rem;
  }
}