/* ===== CSS Variables / Theme ===== */
:root {
  --bg: #F0F2F5;
  --bg-card: #ffffff;
  --bg-elevated: #ffffff;
  --bg-subtle: #F8F9FA;
  --bg-header: #007bff;
  --bg-input: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --text-inverse: #ffffff;
  --border: #e1e5eb;
  --border-strong: #cbd5e0;
  --accent: #007bff;
  --accent-hover: #0056b3;
  --accent-soft: rgba(0, 123, 255, 0.1);
  --success: #28a745;
  --success-hover: #218838;
  --success-soft: rgba(40, 167, 69, 0.12);
  --danger: #dc3545;
  --danger-hover: #c82333;
  --warning: #ffc107;
  --warning-soft: #fff3cd;
  --warning-text: #856404;
  --done-bg: #e7f5ea;
  --current-bg: #e3f2fd;
  --table-stripe: #f8f9fa;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 14px;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --transition: 0.2s ease;
}

body.dark-mode {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-elevated: #1e293b;
  --bg-subtle: #0f172a;
  --bg-header: #1e3a5f;
  --bg-input: #0f172a;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --border: #334155;
  --border-strong: #475569;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-soft: rgba(96, 165, 250, 0.15);
  --success: #34d399;
  --success-hover: #6ee7b7;
  --success-soft: rgba(52, 211, 153, 0.15);
  --danger: #f87171;
  --danger-hover: #fca5a5;
  --warning: #fbbf24;
  --warning-soft: #422006;
  --warning-text: #fde68a;
  --done-bg: #14532d;
  --current-bg: #1e3a5f;
  --table-stripe: #1a2236;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
}

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

/* CRITICAL: [hidden] attribute must always win over display: flex/grid.
   Without this, elements like .result-section (display: flex) stay visible
   even when hidden=true because the class selector has higher specificity. */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background-color: var(--bg-header);
  color: var(--text-inverse);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: 0.3px;
}

.app-title i {
  font-size: 1.4rem;
  color: #ffd54f;
}

.theme-toggle {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--text-inverse);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  background: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.4);
}

/* ===== Container ===== */
.container {
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Card System ===== */
.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, background-color 0.3s, border-color 0.3s;
}

.card:hover {
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text);
  font-size: 0.95rem;
}

.card-title {
  flex: 1;
  font-weight: 600;
}

.card-title-meta {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.card-body {
  padding: 16px 18px;
}

/* ===== Step Badge ===== */
.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--accent);
  color: white;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
  flex-shrink: 0;
}

.step-badge-current {
  background-color: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-soft); }
  50% { box-shadow: 0 0 0 6px transparent; }
}

/* ===== Textarea ===== */
#tokenInput {
  width: 100%;
  min-height: 110px;
  padding: 12px 14px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: var(--font-mono);
  outline: none;
  resize: vertical;
  background-color: var(--bg-input);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.3s;
  display: block;
}

#tokenInput:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

#tokenInput::placeholder {
  color: var(--text-muted);
}

/* ===== Warning ===== */
.warning {
  color: var(--danger);
  background-color: var(--bg-card);
  border: 1px solid var(--danger);
  border-left: 4px solid var(--danger);
  border-radius: var(--radius);
  padding: 10px 14px;
  margin-top: 12px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.warning::before {
  content: '⚠';
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ===== Action Row ===== */
.action-row {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* ===== Buttons ===== */
.btn,
.start-btn {
  border: 1px solid transparent;
  padding: 10px 18px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}

.btn:active,
.start-btn:active {
  transform: scale(0.97);
}

.btn:disabled,
.start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--border);
  border-color: var(--border-strong);
}

.btn-success {
  background-color: var(--success);
  color: white;
  border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
  background-color: var(--success-hover);
  border-color: var(--success-hover);
}

.btn-danger-ghost {
  background-color: transparent;
  color: var(--danger);
  border-color: var(--border-strong);
}

.btn-danger-ghost:hover:not(:disabled) {
  background-color: var(--danger);
  color: white;
  border-color: var(--danger);
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  color: var(--text);
  border-color: var(--accent);
}

.btn-lg {
  padding: 12px 20px;
  font-size: 1rem;
  flex: 1;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.85rem;
}

.start-btn {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
  padding: 12px 24px;
  font-size: 1rem;
}

.start-btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* ===== Session Prompt ===== */
.session-prompt {
  background-color: var(--warning-soft);
  color: var(--warning-text);
  border: 1px solid var(--warning);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}

.session-prompt p {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.session-actions {
  display: flex;
  gap: 10px;
}

/* ===== Result Section ===== */
.result-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== Meter Info ===== */
.meter-info .card-body {
  padding: 0;
}

.meter-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1px;
  background-color: var(--border);
}

.meter-info-item {
  background-color: var(--bg-card);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meter-info-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.meter-info-value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  font-family: var(--font-mono);
}

/* ===== Progress Card ===== */
.progress-card .card-body {
  padding: 14px 18px;
}

.progress-text-inline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 12px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background-color: var(--bg-subtle);
  border-radius: 5px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 5px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Token Card (Current) ===== */
.token-card .card-header {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  border-bottom: none;
}

.token-card .card-header .card-title,
.token-card .card-header .step-badge {
  color: white;
}

.token-card .card-header .step-badge {
  background: rgba(255,255,255,0.25);
}

.token-card .card-header .card-title-meta {
  color: rgba(255,255,255,0.9);
  background: rgba(255,255,255,0.15);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
}

.token-card .card-body {
  padding: 20px 18px;
}

.token-number-box {
  width: 100%;
  font-size: clamp(1.1rem, 4vw, 1.5rem);
  letter-spacing: 0.1em;
  font-weight: 700;
  font-family: var(--font-mono);
  text-align: center;
  padding: 24px 12px;
  color: var(--text);
  word-break: break-all;
  line-height: 1.5;
  background-color: var(--bg-subtle);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  margin-bottom: 16px;
  user-select: all;
  -webkit-user-select: all;
}

.nav-row {
  display: flex;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.nav-row .btn {
  flex: 1;
}

.nav-row .btn-secondary,
.nav-row .btn-danger-ghost {
  flex: 0 0 auto;
  width: 44px;
  padding: 10px;
}

/* ===== Table Card ===== */
.token-table-container {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius);
}

.token-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.token-table thead {
  background-color: var(--bg-subtle);
}

.token-table th {
  padding: 10px 12px;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  border-bottom: 1.5px solid var(--border);
}

.token-table th.col-seq {
  width: 60px;
  text-align: center;
}

.token-table th.col-state {
  width: 50px;
  text-align: center;
}

.token-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}

.token-table tbody tr {
  transition: background-color 0.15s;
}

.token-table tbody tr:last-child td {
  border-bottom: none;
}

.token-table tbody tr:nth-child(even) {
  background-color: var(--table-stripe);
}

.token-table tbody tr.clickable-row {
  cursor: pointer;
}

.token-table tbody tr.clickable-row:hover {
  background-color: var(--accent-soft);
}

.token-table tbody tr.done-token {
  background-color: var(--success-soft);
}

.token-table tbody tr.done-token .token-cell,
.token-table tbody tr.done-token .seq-cell {
  text-decoration: line-through;
  opacity: 0.6;
}

.token-table tbody tr.current-token {
  background-color: var(--current-bg);
  position: relative;
}

.token-table tbody tr.current-token td:first-child {
  border-left: 3px solid var(--accent);
  padding-left: 9px;
}

.token-table .seq-cell {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  width: 60px;
}

.token-table .token-cell {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.3px;
  color: var(--text);
}

.token-table .state-cell {
  text-align: center;
  width: 50px;
}

.state-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  background: transparent;
  transition: all 0.2s;
  position: relative;
}

.state-dot[data-state="pending"] {
  border-color: var(--text-muted);
  background: transparent;
}

.state-dot[data-state="current"] {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.state-dot[data-state="done"] {
  border-color: var(--success);
  background: var(--success);
}

.state-dot[data-state="done"]::after {
  content: '✓';
  color: white;
  font-size: 9px;
  font-weight: 900;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  line-height: 1;
}

/* ===== Help / Instructions (collapsible) ===== */
.help-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
}

.help-card[open] {
  border-left-color: var(--accent);
}

.help-summary {
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background-color 0.2s;
}

.help-summary::-webkit-details-marker {
  display: none;
}

.help-summary:hover {
  background-color: var(--bg-subtle);
}

.help-chevron {
  margin-left: auto;
  transition: transform 0.2s;
  font-size: 0.85rem;
  color: var(--text-muted);
}

details[open] .help-chevron {
  transform: rotate(180deg);
}

.help-body {
  font-size: 0.9rem;
  line-height: 1.6;
}

.help-section {
  font-weight: 700;
  color: var(--accent);
  margin: 12px 0 6px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.help-section:first-child {
  margin-top: 0;
}

.help-body ul {
  padding-left: 20px;
  margin: 0 0 8px;
  color: var(--text-secondary);
}

.help-body li {
  margin-bottom: 4px;
}

.help-body kbd {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.8em;
  font-family: var(--font-mono);
  color: var(--text);
  box-shadow: 0 1px 0 var(--border);
}

.help-footer {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
  max-width: 90vw;
}

.toast {
  background-color: var(--text);
  color: var(--bg-card);
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: auto;
  max-width: 100%;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.hide {
  opacity: 0;
  transform: translateY(-10px);
}

/* ===== Footer ===== */
footer {
  background-color: var(--bg-card);
  color: var(--text-secondary);
  text-align: center;
  padding: 18px;
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
  transition: background-color 0.3s, border-color 0.3s;
}

.footer-content {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-icons {
  display: flex;
  gap: 14px;
}

.footer-icons a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.15rem;
  transition: color 0.2s;
}

.footer-icons a:hover {
  color: var(--accent);
}

.footer-contribute {
  padding-top: 8px;
  font-size: 0.8rem;
}

.footer-contribute a {
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

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

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

/* Only animate the result section when it becomes visible (not on every card on every render) */
.result-section {
  animation: fadeIn 0.3s ease-out;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .container {
    padding: 14px 12px;
    gap: 12px;
  }

  .card-body {
    padding: 14px;
  }

  .card-header {
    padding: 12px 14px;
    font-size: 0.9rem;
  }

  #tokenInput {
    min-height: 100px;
    font-size: 14px;
  }

  .token-number-box {
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    padding: 18px 10px;
  }

  .btn-lg {
    width: 100%;
  }

  .nav-row {
    flex-wrap: wrap;
  }

  .nav-row .btn {
    flex: 1 1 auto;
  }

  .nav-row .btn-secondary,
  .nav-row .btn-danger-ghost {
    flex: 0 0 44px;
  }

  .meter-info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .token-table th,
  .token-table td {
    padding: 8px 10px;
    font-size: 0.85rem;
  }

  .token-table .token-cell {
    font-size: 0.72rem;
  }

  .app-title {
    font-size: 1.1rem;
  }
}

@media (max-width: 380px) {
  .meter-info-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Print ===== */
@media print {
  .app-header,
  .nav-row,
  .action-row,
  .session-prompt,
  .help-card,
  .toast-container,
  .footer-contribute,
  .theme-toggle {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    border: 1px solid #ccc;
    box-shadow: none;
    page-break-inside: avoid;
  }

  .token-card .card-header {
    background: white !important;
    color: black !important;
    border-bottom: 2px solid black;
  }

  .token-card .card-header .card-title,
  .token-card .card-header .step-badge,
  .token-card .card-header .card-title-meta {
    color: black !important;
  }

  .token-card .card-header .step-badge {
    border: 1px solid black;
  }

  .token-number-box {
    border: 2px solid black;
    background: white;
  }

  .token-table {
    border: 1px solid black;
  }

  .token-table th,
  .token-table td {
    border: 1px solid black;
    color: black;
  }

  .token-table tr.done-token {
    background-color: #e7f5ea !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .token-table tr.current-token {
    background-color: #e3f2fd !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}