*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2e3345;
  --text: #e8eaed;
  --muted: #9aa0b0;
  --accent: #6c63ff;
  --radius-card: 10px;
  --radius-input: 6px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
header {
  text-align: center;
  padding: 40px 0 24px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

header p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}

/* Tabs */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
  justify-content: center;
}

.tab-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px 16px;
  border-radius: var(--radius-input);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: var(--font);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.tab-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Main layout */
.main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

@media (min-width: 700px) {
  .main-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
}

.card h2 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  font-weight: 600;
}

/* Form elements */
.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field input[type="url"],
.field input[type="number"],
.field input[type="color"],
.field textarea,
.field select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-input);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color 0.2s;
}

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

.field textarea {
  resize: vertical;
  min-height: 70px;
}

.field select {
  cursor: pointer;
}

.field input[type="color"] {
  height: 40px;
  padding: 4px;
  cursor: pointer;
}

.field-row {
  display: flex;
  gap: 12px;
}

.field-row .field {
  flex: 1;
}

/* Password field */
.password-wrap {
  position: relative;
}

.password-wrap input {
  padding-right: 48px;
}

.password-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font);
  padding: 4px 6px;
}

.password-toggle:hover {
  color: var(--text);
}

/* Toggle switch */
.toggle-field {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.toggle-field label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0;
}

.toggle {
  position: relative;
  width: 42px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 22px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 3px;
  top: 3px;
  background: var(--text);
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* Range slider */
.range-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range-wrap input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

.range-value {
  font-size: 0.85rem;
  color: var(--muted);
  min-width: 44px;
  text-align: right;
}

/* Explanation text */
.field-hint {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 2px;
}

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

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

/* QR preview */
.qr-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.qr-display {
  background: #fff;
  border-radius: var(--radius-card);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  min-width: 200px;
}

.qr-display svg,
.qr-display canvas,
.qr-display img {
  display: block;
  max-width: 100%;
  height: auto;
}

.qr-placeholder {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 40px 20px;
}

/* Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-input);
  font-size: 0.9rem;
  font-family: var(--font);
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: background 0.2s, border-color 0.2s;
}

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

.btn-primary:hover {
  background: #5b53e0;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

/* Internal links section */
.internal-links {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 40px;
  text-align: center;
}

.internal-links h2 {
  font-size: 1.1rem;
  margin-bottom: 14px;
  font-weight: 600;
}

.internal-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  list-style: none;
}

.internal-links-list a {
  display: inline-block;
  padding: 8px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  font-size: 0.9rem;
  transition: border-color 0.2s;
}

.internal-links-list a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

/* FAQ */
.faq-section {
  margin-bottom: 40px;
}

.faq-section h2 {
  font-size: 1.3rem;
  text-align: center;
  margin-bottom: 20px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 20px;
  margin-bottom: 12px;
}

.faq-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--muted);
  font-size: 0.92rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--accent);
  color: #fff;
  padding: 10px 24px;
  border-radius: var(--radius-input);
  font-size: 0.9rem;
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  z-index: 1000;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}