/**
 * KRV Network Tools — premium UI matching krivoshein.site
 * Light + dark (html[data-theme="dark"])
 */

.krv-nt {
  --nt-accent: #5181fe;
  --nt-accent-dark: #315fe8;
  --nt-accent-soft: #eef4ff;
  --nt-text: #111827;
  --nt-muted: #5b6472;
  --nt-line: #e7ecf5;
  --nt-line-strong: #d7e0ee;
  --nt-surface: #ffffff;
  --nt-soft: #f8fafc;
  --nt-danger: #dc2626;
  --nt-ok: #15803d;
  --nt-shadow: 0 12px 34px rgba(15, 23, 42, 0.07);
  --nt-radius: 16px;
  --nt-font: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  max-width: 820px;
  margin: 0 auto 1.75rem;
  font-family: var(--nt-font);
  color: var(--nt-text);
  -webkit-font-smoothing: antialiased;
}

html[data-theme="dark"] .krv-nt,
body.dark .krv-nt,
body[data-theme="dark"] .krv-nt,
.dark .krv-nt {
  --nt-accent: #6b9bff;
  --nt-accent-dark: #8eb4ff;
  --nt-accent-soft: rgba(107, 155, 255, 0.12);
  --nt-text: #e8eef8;
  --nt-muted: #a8b4c4;
  --nt-line: rgba(107, 155, 255, 0.22);
  --nt-line-strong: rgba(107, 155, 255, 0.35);
  --nt-surface: rgba(255, 255, 255, 0.05);
  --nt-soft: rgba(255, 255, 255, 0.07);
  --nt-danger: #f87171;
  --nt-ok: #4ade80;
  --nt-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

/* Fallback if theme attr not yet applied */
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .krv-nt {
    --nt-accent: #6b9bff;
    --nt-accent-dark: #8eb4ff;
    --nt-accent-soft: rgba(107, 155, 255, 0.12);
    --nt-text: #e8eef8;
    --nt-muted: #a8b4c4;
    --nt-line: rgba(107, 155, 255, 0.22);
    --nt-line-strong: rgba(107, 155, 255, 0.35);
    --nt-surface: rgba(255, 255, 255, 0.05);
    --nt-soft: rgba(255, 255, 255, 0.07);
    --nt-danger: #f87171;
    --nt-ok: #4ade80;
    --nt-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  }
}

.krv-nt *,
.krv-nt *::before,
.krv-nt *::after {
  box-sizing: border-box;
}

.krv-nt__head {
  text-align: center;
  margin-bottom: 1rem;
}

.krv-nt__title {
  margin: 0 0 0.35rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--nt-text);
}

.krv-nt__lead {
  margin: 0;
  font-size: 0.95rem;
  color: var(--nt-muted);
  line-height: 1.55;
}

.krv-nt__card {
  background: var(--nt-surface);
  border: 1px solid var(--nt-line);
  border-radius: var(--nt-radius);
  box-shadow: var(--nt-shadow);
  padding: 1.25rem 1.35rem 1.35rem;
}

.krv-nt__fields {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.krv-nt__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: stretch;
}

.krv-nt__field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  min-width: 160px;
}

.krv-nt__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--nt-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.krv-nt__input,
.krv-nt__select,
.krv-nt__textarea {
  width: 100%;
  border: 1px solid var(--nt-line-strong);
  border-radius: 12px;
  padding: 0.7rem 0.9rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--nt-text);
  background: var(--nt-soft);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.krv-nt__input:focus,
.krv-nt__select:focus,
.krv-nt__textarea:focus {
  outline: none;
  border-color: var(--nt-accent);
  box-shadow: 0 0 0 3px var(--nt-accent-soft);
}

.krv-nt__textarea {
  min-height: 96px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
}

.krv-nt__checkgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.45rem 0.75rem;
  padding: 0.75rem;
  background: var(--nt-soft);
  border: 1px solid var(--nt-line);
  border-radius: 12px;
}

.krv-nt__check {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--nt-text);
  cursor: pointer;
}

.krv-nt__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.25rem;
}

.krv-nt__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border-radius: 12px;
  padding: 0.75rem 1.2rem;
  min-height: 44px; /* touch target */
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: transform 0.12s ease, background 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.krv-nt__btn:disabled {
  opacity: 0.55;
  cursor: wait;
  transform: none !important;
}

.krv-nt__btn--primary {
  background: linear-gradient(135deg, var(--nt-accent) 0%, var(--nt-accent-dark) 100%);
  color: #fff;
  box-shadow: 0 10px 28px rgba(49, 95, 232, 0.28);
}

.krv-nt__btn--primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(49, 95, 232, 0.34);
}

.krv-nt__btn--ghost {
  background: transparent;
  color: var(--nt-text);
  border: 1px solid var(--nt-line-strong);
}

.krv-nt__btn--ghost:hover:not(:disabled) {
  border-color: var(--nt-accent);
  color: var(--nt-accent-dark);
}

/* Progress */
.krv-nt__progress {
  margin-top: 1.1rem;
}

.krv-nt__progress[hidden] {
  display: none !important;
}

.krv-nt__progress-track {
  height: 8px;
  border-radius: 999px;
  background: var(--nt-soft);
  border: 1px solid var(--nt-line);
  overflow: hidden;
  position: relative;
}

.krv-nt__progress-bar {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--nt-accent) 0%, #7aa2ff 50%, var(--nt-accent-dark) 100%);
  background-size: 200% 100%;
  transition: width 0.25s ease;
  animation: krv-nt-shimmer 1.4s linear infinite;
}

.krv-nt__progress-bar.is-indeterminate {
  width: 40% !important;
  animation: krv-nt-indet 1.1s ease-in-out infinite, krv-nt-shimmer 1.4s linear infinite;
}

@keyframes krv-nt-shimmer {
  0% { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

@keyframes krv-nt-indet {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(280%); }
}

.krv-nt__progress-label {
  margin: 0.45rem 0 0;
  font-size: 0.82rem;
  color: var(--nt-muted);
  font-weight: 500;
}

/* Result */
.krv-nt__result {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--nt-line);
}

.krv-nt__result[hidden] {
  display: none !important;
}

.krv-nt__result.is-error {
  color: var(--nt-danger);
}

.krv-nt__table-wrap {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--nt-line);
}

.krv-nt__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.krv-nt__table th,
.krv-nt__table td {
  padding: 0.7rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--nt-line);
  vertical-align: top;
  word-break: break-word;
}

.krv-nt__table th {
  background: var(--nt-accent-soft);
  color: var(--nt-text);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.krv-nt__table tr:last-child td {
  border-bottom: none;
}

.krv-nt__table tbody tr:nth-child(even) {
  background: var(--nt-soft);
}

.krv-nt__meta {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--nt-muted);
  line-height: 1.5;
}

.krv-nt__code {
  display: block;
  margin-top: 0.5rem;
  padding: 0.9rem 1rem;
  background: var(--nt-soft);
  border: 1px solid var(--nt-line);
  border-radius: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86rem;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--nt-text);
}

.krv-nt__badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--nt-accent-soft);
  color: var(--nt-accent-dark);
}

.krv-nt__badge--ok {
  background: rgba(21, 128, 61, 0.12);
  color: var(--nt-ok);
}

.krv-nt__badge--bad {
  background: rgba(220, 38, 38, 0.12);
  color: var(--nt-danger);
}

/* Speed test specific */
.krv-nt--speed .krv-nt__meters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

@media (max-width: 560px) {
  .krv-nt--speed .krv-nt__meters {
    grid-template-columns: 1fr;
  }
}

.krv-nt__meter {
  padding: 0.85rem;
  border-radius: 14px;
  border: 1px solid var(--nt-line);
  background: var(--nt-soft);
}

.krv-nt__meter-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--nt-muted);
  margin-bottom: 0.35rem;
}

.krv-nt__meter-value {
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--nt-text);
  font-variant-numeric: tabular-nums;
}

.krv-nt__meter-unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--nt-muted);
  margin-left: 0.2rem;
}

.krv-nt__meter .krv-nt__progress-track {
  margin-top: 0.65rem;
}

.krv-nt__userinfo {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 0.75rem;
  margin-bottom: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--nt-line);
  background: var(--nt-soft);
  font-size: 0.88rem;
}

@media (max-width: 520px) {
  .krv-nt__userinfo {
    grid-template-columns: 1fr;
  }
}

.krv-nt__userinfo dt {
  margin: 0;
  color: var(--nt-muted);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.krv-nt__userinfo dd {
  margin: 0.1rem 0 0;
  font-weight: 600;
  color: var(--nt-text);
  word-break: break-all;
}

/* Site checker intro */
.krv-nt__intro {
  margin-bottom: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 14px;
  border: 1px solid var(--nt-line);
  background: var(--nt-soft);
  color: var(--nt-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.krv-nt__intro ul {
  margin: 0.6rem 0 0;
  padding-left: 1.1rem;
}

.krv-nt__intro li {
  margin: 0.25rem 0;
}

@media (max-width: 600px) {
  .krv-nt {
    margin-left: 0;
    margin-right: 0;
    max-width: 100%;
  }
  .krv-nt__card {
    padding: 1rem;
    border-radius: 14px;
  }
  .krv-nt__btn {
    width: 100%;
  }
  .krv-nt__actions {
    flex-direction: column;
  }
  .krv-nt__row {
    flex-direction: column;
  }
  .krv-nt__field {
    min-width: 0;
    width: 100%;
  }
  .krv-nt__table th,
  .krv-nt__table td {
    padding: 0.55rem 0.65rem;
    font-size: 0.86rem;
  }
  .krv-nt__meter-value {
    font-size: 1.35rem;
  }
  .krv-nt__checkgrid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Inside service page shell — avoid double visual weight */
.krv-service-page .krv-nt {
  margin-top: 0.25rem;
}
.krv-service-page .krv-nt__card {
  box-shadow: var(--nt-shadow);
}

/* Result error state */
.krv-nt__result.is-error p,
.krv-nt__result.is-error {
  color: var(--nt-danger);
}

/* Focus visible for a11y */
.krv-nt__btn:focus-visible,
.krv-nt__input:focus-visible,
.krv-nt__select:focus-visible {
  outline: 2px solid var(--nt-accent);
  outline-offset: 2px;
}