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

:root {
  --bg: #0b0c10;
  --surface: rgba(20, 22, 28, 0.9);
  --surface2: rgba(30, 34, 42, 0.8);
  --surface3: rgba(44, 48, 58, 0.9);
  --border: rgba(255, 255, 255, 0.06);
  --border2: rgba(255, 255, 255, 0.12);
  --text: #ffffff;
  --text2: #a0a5b5;
  --text3: #6a6f7e;
  --accent: #7c6af7;
  --accent2: #a78bfa;
  --accent-glow: rgba(124, 106, 247, 0.25);
  --green: #22c55e;
  --green-bg: rgba(34, 197, 94, 0.15);
  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.15);
  --gold: #f59e0b;
  --gold-bg: rgba(245, 158, 11, 0.15);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 8px 20px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--accent-glow);
}

body {
  background: var(--bg);
  background-image: radial-gradient(circle at 20% 20%, #1a1e2a 0%, #0b0c10 100%);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  line-height: 1.6;
  backdrop-filter: blur(2px);
}

/* Плавный скролл */
html {
  scroll-behavior: smooth;
}

.app {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 16px 80px;
}

/* ── Logo ── */
.logo {
  text-align: center;
  padding: 56px 0 48px;
}
.logo-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(145deg, var(--accent), var(--accent2));
  border-radius: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  margin-bottom: 18px;
  box-shadow: var(--shadow-glow), var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: transform 0.2s ease;
}
.logo-icon:hover {
  transform: scale(1.02);
}
.logo h1 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(to right, #fff, #c0c7ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 30px var(--accent-glow);
}
.logo p {
  color: var(--text2);
  font-size: 16px;
  margin-top: 8px;
  font-weight: 400;
}

/* ── Cards ── */
.card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.23, 1, 0.32, 1);
  text-decoration: none;
  white-space: nowrap;
  backdrop-filter: blur(8px);
}
.btn:active {
  transform: scale(0.96);
}
.btn-primary {
  background: linear-gradient(145deg, var(--accent), #6950e0);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 20px rgba(124, 106, 247, 0.3);
}
.btn-primary:hover {
  background: linear-gradient(145deg, #8b7aff, #7c6af7);
  box-shadow: 0 10px 25px rgba(124, 106, 247, 0.5);
  transform: translateY(-2px);
}
.btn-secondary {
  background: var(--surface2);
  backdrop-filter: blur(10px);
  color: var(--text);
  border-color: var(--border2);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
.btn-secondary:hover {
  background: var(--surface3);
  border-color: var(--accent);
  transform: translateY(-1px);
}
.btn-danger {
  background: var(--red-bg);
  color: var(--red);
  border-color: rgba(239, 68, 68, 0.4);
  backdrop-filter: blur(8px);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: var(--red);
}
.btn-success {
  background: var(--green-bg);
  color: var(--green);
  border-color: rgba(34, 197, 94, 0.4);
}
.btn-success:hover {
  background: rgba(34, 197, 94, 0.2);
}
.btn-full {
  width: 100%;
}
.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
}

/* ── Main menu ── */
.menu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 16px;
}
.menu-card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 24px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.menu-card:hover {
  border-color: var(--accent);
  background: rgba(124, 106, 247, 0.1);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md), 0 0 30px var(--accent-glow);
}
.menu-card-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: block;
  filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
}
.menu-card h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}
.menu-card p {
  font-size: 14px;
  color: var(--text2);
}

/* ── Quiz list ── */
.quiz-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface2);
  backdrop-filter: blur(8px);
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.quiz-item:hover {
  border-color: var(--accent);
  background: rgba(124, 106, 247, 0.1);
  transform: translateX(6px);
  box-shadow: 0 0 15px var(--accent-glow);
}
.quiz-item-icon {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: var(--accent-glow);
  border: 1px solid rgba(124, 106, 247, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  flex-shrink: 0;
}
.quiz-item-info {
  flex: 1;
}
.quiz-item-title {
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 6px;
}
.quiz-item-meta {
  font-size: 13px;
  color: var(--text2);
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 30px;
  font-size: 12px;
  font-weight: 700;
  backdrop-filter: blur(4px);
}
.badge-purple {
  background: var(--accent-glow);
  color: var(--accent2);
  border: 1px solid rgba(124, 106, 247, 0.4);
}
.badge-green {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

/* ── Quiz play ── */
.progress-bar {
  height: 6px;
  background: var(--surface3);
  border-radius: 6px;
  margin-bottom: 28px;
  overflow: hidden;
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.5);
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 6px;
  box-shadow: 0 0 10px var(--accent);
  transition: width 0.4s ease;
}
.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}
.question-num {
  font-size: 14px;
  color: var(--text2);
  font-weight: 600;
  letter-spacing: 0.5px;
}
.timer-display {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--gold);
  padding: 6px 14px;
  background: rgba(245, 158, 11, 0.1);
  border-radius: 40px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}
.timer-display.danger {
  color: var(--red);
  background: var(--red-bg);
  border-color: var(--red);
  animation: pulse 1s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}
.question-text {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 32px;
  text-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.options-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}
.option-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border2);
  background: var(--surface2);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  width: 100%;
  font-size: 16px;
  color: var(--text);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: rgba(124, 106, 247, 0.15);
  transform: scale(1.01);
}
.option-btn:disabled {
  cursor: default;
  opacity: 0.8;
}
.option-letter {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--surface3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  flex-shrink: 0;
  border: 1px solid var(--border2);
}
.option-btn.correct {
  border-color: var(--green) !important;
  background: var(--green-bg) !important;
}
.option-btn.correct .option-letter {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}
.option-btn.wrong {
  border-color: var(--red) !important;
  background: var(--red-bg) !important;
}
.option-btn.wrong .option-letter {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}
.option-btn.selected {
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* ── Feedback ── */
.feedback {
  display: none;
  padding: 18px 22px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  font-weight: 600;
  font-size: 16px;
  align-items: center;
  gap: 12px;
  backdrop-filter: blur(8px);
}
.feedback.show {
  display: flex;
}
.feedback.correct-fb {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid rgba(34, 197, 94, 0.4);
}
.feedback.wrong-fb {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid rgba(239, 68, 68, 0.4);
}

/* ── Stats bar ── */
.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.stat-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 60px;
  background: var(--surface2);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.stat-pill .label {
  color: var(--text2);
  font-weight: 400;
  font-size: 13px;
}

/* ── Results ── */
.result-hero {
  text-align: center;
  padding: 36px 0 28px;
}
.result-score-circle {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  border: 4px solid var(--accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  background: var(--accent-glow);
  box-shadow: 0 0 40px var(--accent-glow);
  backdrop-filter: blur(4px);
}
.result-score-num {
  font-size: 48px;
  font-weight: 900;
  color: var(--accent2);
}
.result-score-label {
  font-size: 14px;
  color: var(--text2);
}
.result-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}
.result-sub {
  color: var(--text2);
  font-size: 16px;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 32px 0;
}
.result-stat {
  background: var(--surface2);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.result-stat .val {
  font-size: 28px;
  font-weight: 800;
}
.result-stat .lbl {
  font-size: 12px;
  color: var(--text2);
  margin-top: 6px;
}

/* ── Forms ── */
.form-group {
  margin-bottom: 24px;
}
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text2);
  margin-bottom: 10px;
  letter-spacing: 0.3px;
}
.form-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--surface2);
  backdrop-filter: blur(4px);
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: all 0.2s;
}
.form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-input::placeholder {
  color: var(--text3);
}
.options-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.option-row .option-index {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--surface3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
  color: var(--text2);
}
.option-row .form-input {
  margin: 0;
}
.correct-radio {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border2);
  padding: 16px 28px;
  border-radius: 60px;
  font-size: 15px;
  font-weight: 600;
  z-index: 1000;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  white-space: nowrap;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}
.toast.toast-success {
  color: var(--green);
  border-color: rgba(34, 197, 94, 0.5);
}
.toast.toast-error {
  color: var(--red);
  border-color: rgba(239, 68, 68, 0.5);
}

/* ── Top bar ── */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}
.topbar h2 {
  font-size: 24px;
  font-weight: 700;
  flex: 1;
}
.back-btn {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  background: var(--surface2);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 22px;
  flex-shrink: 0;
  transition: all 0.2s;
}
.back-btn:hover {
  background: var(--surface3);
  border-color: var(--accent);
  transform: scale(1.05);
}

/* ── Step counter ── */
.num-select {
  display: flex;
  align-items: center;
  gap: 18px;
}
.num-btn {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 24px;
  font-weight: 700;
  transition: all 0.2s;
  color: var(--text);
  backdrop-filter: blur(4px);
}
.num-btn:hover {
  background: var(--surface3);
  border-color: var(--accent);
}
.num-val {
  font-size: 24px;
  font-weight: 800;
  min-width: 32px;
  text-align: center;
}

/* ── Empty state ── */
.empty {
  text-align: center;
  padding: 64px 0;
  color: var(--text2);
}
.empty-icon {
  font-size: 56px;
  margin-bottom: 20px;
  opacity: 0.7;
}
.empty p {
  font-size: 16px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--surface2);
  border-radius: 8px;
}
::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 8px;
  border: 2px solid var(--surface2);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent2);
}

/* ── Pages ── */
.page {
  display: none;
  animation: fadeIn 0.3s ease;
}
.page.active {
  display: block;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Edit quiz list ── */
.edit-quiz-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface2);
  backdrop-filter: blur(8px);
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s;
}
.edit-quiz-item:hover {
  border-color: var(--gold);
  background: rgba(245, 158, 11, 0.1);
  transform: translateX(6px);
}

/* ── Responsive ── */
@media (max-width: 500px) {
  .menu-grid {
    grid-template-columns: 1fr;
  }
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .question-text {
    font-size: 18px;
  }
}