/* Современный дизайн — цвета #FF0057, #FF2D7A */
:root {
  --btn-main: #FF0057;
  --btn-hover: #FF2D7A;
  --btn-glow: rgba(255, 45, 122, 0.4);
  --bg-dark: #0c0c0f;
  --bg-card: rgba(22, 22, 28, 0.7);
  --bg-card-solid: #16161c;
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 0, 87, 0.2);
  --input-bg: rgba(255, 255, 255, 0.04);
  --input-border: rgba(255, 255, 255, 0.08);
  --input-focus: rgba(255, 0, 87, 0.5);
  --text: #f0f0f2;
  --text-muted: #8b8b94;
  --text-label: #a8a8b3;
  --ok: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --hard: #fb923c;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse 100% 70% at 80% -10%, rgba(255, 0, 87, 0.07) 0%, transparent 50%),
    radial-gradient(ellipse 60% 50% at 10% 90%, rgba(255, 45, 122, 0.05) 0%, transparent 45%),
    linear-gradient(180deg, #0e0e12 0%, #0c0c0f 100%);
  background-attachment: fixed;
}

/* Верхнее меню — современный glass */
.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: rgba(12, 12, 15, 0.8);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.topnav-brand {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

.topnav-brand:hover {
  color: var(--btn-hover);
}

.topnav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}

.topnav-menu a {
  display: block;
  padding: 10px 18px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.topnav-menu a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.topnav-menu a:hover {
  color: var(--btn-hover);
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 24px 32px;
}

/* Заголовок */
.header {
  text-align: center;
  margin-bottom: 36px;
}

.header h1 {
  margin: 0 0 10px;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.header .sub {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
}

/* Карточки — стекло + тень */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  margin-bottom: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

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

.card h2 {
  margin: 0 0 14px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-label);
}

label {
  display: block;
  margin: 12px 0 6px;
  color: var(--text-label);
  font-size: 0.9rem;
  font-weight: 500;
}

input,
select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

input:focus,
select:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(255, 0, 87, 0.15);
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

button {
  padding: 12px 22px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--btn-main);
  color: #fff;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

button:hover {
  background: var(--btn-hover);
  box-shadow: 0 0 24px var(--btn-glow);
}

button:active {
  transform: scale(0.98);
}

button.primary {
  background: var(--btn-main);
  color: #fff;
}

button.primary:hover {
  background: var(--btn-hover);
  box-shadow: 0 0 28px var(--btn-glow);
}

/* Результат */
.out {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  padding: 8px 0;
  margin-bottom: 4px;
}

.small {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 10px;
  line-height: 1.5;
}

.ok { color: var(--ok); }
.warn { color: var(--warn); }
.bad { color: var(--bad); }
.hard { color: var(--hard); }

ul.reasons {
  margin: 10px 0 0;
  padding-left: 20px;
}

ul.reasons li {
  margin: 6px 0;
}

.demo-label {
  margin-top: 18px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.demo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.demo-row button {
  font-size: 0.78rem;
  padding: 8px 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.demo-row button:hover {
  background: rgba(255, 0, 87, 0.12);
  color: var(--btn-hover);
  border-color: rgba(255, 0, 87, 0.25);
  box-shadow: none;
}

/* Логика */
.logic-toggle {
  cursor: pointer;
  user-select: none;
  padding: 14px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
}

.logic-toggle:hover,
.logic-toggle.open {
  color: var(--text);
}

.logic-toggle::after {
  content: '▼';
  font-size: 0.7rem;
  opacity: 0.7;
  transition: transform 0.25s ease;
}

.logic-toggle.open::after {
  transform: rotate(-180deg);
}

.logic-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.logic-body.open {
  max-height: 320px;
}

.logic-inner {
  padding: 16px 0 8px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.card .hint {
  margin: 0 0 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.card .demo-label {
  margin-top: 18px;
}

.card .row + .row {
  margin-top: 12px;
}

.card .field-mt {
  margin-top: 12px;
}

/* Карточка результата — акцент */
.card:has(.out) {
  border-color: rgba(255, 0, 87, 0.12);
  background: rgba(22, 22, 28, 0.85);
}

/* Футер */
.footer {
  text-align: center;
  padding: 32px 0 20px;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Адаптив */
@media (max-width: 560px) {
  .topnav {
    padding: 14px 18px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .topnav-brand {
    font-size: 1rem;
  }

  .topnav-menu a {
    padding: 8px 14px;
    font-size: 0.85rem;
  }

  .wrap {
    padding: 28px 18px 24px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .card {
    padding: 20px 18px;
    border-radius: var(--radius-md);
  }

  .row {
    grid-template-columns: 1fr;
  }
}