/* SECTION: Design Tokens */
:root {
  /* Color palette - Ocean Slate */
  --color-bg-primary: #0f172a;
  --color-bg-elevated: #020617;
  --color-bg-soft: #0b1220;
  --color-surface: #020617;
  --color-surface-alt: #020617;
  --color-border-subtle: rgba(148, 163, 184, 0.35);
  --color-border-strong: rgba(148, 163, 184, 0.7);
  --color-text-primary: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-text-soft: #6b7280;
  --color-accent: #06b6d4;
  --color-accent-soft: rgba(34, 211, 238, 0.2);
  --color-accent-strong: #22d3ee;
  --color-danger: #f97373;
  --color-success: #4ade80;
  --color-warning: #facc15;

  /* Accent RGB for glow effects */
  --accent-rgb: 34, 211, 238;

  /* Typography */
  --font-sans: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;

  /* Sizing & spacing */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --shadow-soft: 0 1px 2px rgba(15, 23, 42, 0.6),
    0 8px 24px rgba(15, 23, 42, 0.8);

  --transition-fast: 0.15s ease-out;
  --transition-med: 0.25s ease-out;
}

/* SECTION: Global Layout */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background: radial-gradient(circle at top left, #1e293b 0, #020617 45%),
    radial-gradient(circle at bottom right, #0f172a 0, #020617 55%);
  display: flex;
  align-items: stretch;
  justify-content: center;
}

.app-shell {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 980px;
  margin: 32px 20px 40px;
  padding: 32px 24px 40px;
  border-radius: 24px;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.9), #020617);
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

@media (min-width: 768px) {
  .app-shell {
    padding: 40px 40px 44px;
    margin: 40px auto 56px;
  }
}

/* SECTION: Background FX (from visual-effects skill) */
.gradient-mesh {
  background:
    radial-gradient(at 40% 20%, hsla(189, 100%, 56%, 0.24) 0px, transparent 50%),
    radial-gradient(at 80% 0%, hsla(228, 96%, 70%, 0.2) 0px, transparent 50%),
    radial-gradient(at 0% 80%, hsla(199, 89%, 48%, 0.22) 0px, transparent 52%),
    radial-gradient(at 100% 100%, hsla(260, 83%, 56%, 0.2) 0px, transparent 55%),
    #020617;
}

.grain::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: 0.08;
  pointer-events: none;
  mix-blend-mode: soft-light;
}

.floating-shape {
  position: fixed;
  inset: auto;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, #22d3ee, #4f46e5);
  opacity: 0.16;
  filter: blur(70px);
  right: -120px;
  top: -80px;
  z-index: 0;
  animation: float 12s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(-16px, 20px, 0) scale(1.06);
  }
}

/* SECTION: Typography */
.app-header h1 {
  margin: 0 0 8px;
  font-size: 1.9rem;
  letter-spacing: -0.03em;
}

@media (min-width: 768px) {
  .app-header h1 {
    font-size: 2.2rem;
  }
}

.subtitle {
  margin: 0;
  color: var(--color-text-soft);
  max-width: 46rem;
  font-size: 0.98rem;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.accent-line {
  width: 72px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  border-radius: var(--radius-pill);
}

h2 {
  font-size: 1.2rem;
  margin: 0 0 4px;
}

h3 {
  font-size: 1.02rem;
  margin: 0 0 4px;
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.86em;
  background: rgba(15, 23, 42, 0.7);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(148, 163, 184, 0.45);
}

/* SECTION: Panels & Layout */
.layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.panel {
  position: relative;
  background: radial-gradient(circle at top, rgba(148, 163, 184, 0.16), #020617);
  border-radius: 20px;
  border: 1px solid var(--color-border-subtle);
  padding: 18px 16px 20px;
}

.panel + .panel {
  margin-top: 4px;
}

@media (min-width: 768px) {
  .panel {
    padding: 20px 20px 22px;
  }
}

.panel-form {
  border-radius: 18px;
}

.panel-results {
  margin-top: 4px;
}

.panel-source {
  margin-top: 8px;
}

.shadow-soft {
  box-shadow: var(--shadow-soft);
}

.gradient-border {
  border: 1px solid transparent;
  background:
    linear-gradient(#020617, #020617) padding-box,
    linear-gradient(120deg, rgba(34, 211, 238, 0.7), rgba(59, 130, 246, 0.3))
      border-box;
}

/* SECTION: Form Styles */
.probe-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 10px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-group label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.input-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

@media (max-width: 640px) {
  .input-row {
    flex-direction: column;
    align-items: stretch;
  }
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.9);
  color: var(--color-text-soft);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.pill-mode {
  min-width: 90px;
}

#target-input {
  flex: 1;
  min-width: 0;
  border-radius: 999px;
  border: 1px solid var(--color-border-strong);
  background-color: rgba(15, 23, 42, 0.9);
  color: var(--color-text-primary);
  padding: 10px 14px;
  font-size: 0.92rem;
  outline: none;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

#target-input::placeholder {
  color: var(--color-text-soft);
}

#target-input:focus-visible {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.8),
    0 0 0 5px rgba(34, 211, 238, 0.2);
}

#target-input.error {
  border-color: var(--color-danger);
}

.field-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

.field-error {
  min-height: 1.1em;
  margin: 2px 0 0;
  font-size: 0.8rem;
  color: var(--color-danger);
}

.field-row.field-options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  align-items: center;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--color-text-soft);
  cursor: pointer;
}

.checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--color-border-subtle);
  background: rgba(15, 23, 42, 1);
  accent-color: var(--color-accent);
}

/* SECTION: Buttons */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform 0.12s ease-out;
  min-height: 40px;
}

.btn-primary {
  background: radial-gradient(circle at top left, #22d3ee, #0ea5e9);
  border-color: rgba(34, 211, 238, 0.2);
  color: #0b1120;
  box-shadow: 0 10px 30px rgba(15, 118, 110, 0.55);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 36px rgba(8, 47, 73, 0.96);
}

.btn-primary:active {
  transform: translateY(0px) scale(0.98);
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1px #0f172a, 0 0 0 4px rgba(34, 211, 238, 0.9);
}

.btn-ghost {
  padding-inline: 10px;
  border-radius: 999px;
  border-color: rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.4);
  color: var(--color-text-soft);
}

.btn-ghost:hover {
  background: rgba(15, 23, 42, 0.9);
  color: var(--color-text-primary);
}

.btn-ghost:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.9),
    0 0 0 4px rgba(148, 163, 184, 0.35);
}

.btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 2px solid rgba(15, 23, 42, 0.8);
  border-top-color: #0f172a;
  display: none;
  animation: spin 0.7s linear infinite;
}

.btn-loading .spinner {
  display: inline-block;
}

.btn-loading .btn-label {
  opacity: 0.5;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* SECTION: Results Layout */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.results-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr);
  gap: 12px;
}

@media (min-width: 720px) {
  .results-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr) minmax(0, 1.1fr);
  }
}

.card {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.96), #020617);
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 14px 14px 16px;
}

.card h3 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(30, 64, 175, 0.7);
  margin-bottom: 6px;
}

.status-summary {
  font-size: 0.9rem;
  color: var(--color-text-primary);
}

.status-summary.empty {
  color: var(--color-text-soft);
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.status-chip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-ok .status-chip-dot {
  background: var(--color-success);
}

.status-error .status-chip-dot {
  background: var(--color-danger);
}

.status-warn .status-chip-dot {
  background: var(--color-warning);
}

.status-meta {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 0.78rem;
  color: var(--color-text-soft);
}

.status-meta span::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.7);
  margin-right: 6px;
}

.kv-list {
  margin: 0;
  padding: 0;
}

.kv-row {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 0.82rem;
  padding: 4px 0;
}

.kv-row dt {
  color: var(--color-text-soft);
}

.kv-row dd {
  margin: 0;
  color: var(--color-text-primary);
  text-align: right;
}

.skeleton-row dd {
  color: rgba(148, 163, 184, 0.5);
}

.kv-row strong {
  font-weight: 500;
}

/* SECTION: Timeline */
.timeline-section {
  margin-top: 16px;
}

.timeline-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}

.timeline-caption {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

.timeline-wrapper {
  border-radius: 14px;
  border: 1px dashed rgba(148, 163, 184, 0.35);
  background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.9), #020617);
  padding: 8px 10px 10px;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.timeline-item {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 2fr);
  gap: 10px;
  align-items: center;
}

@media (max-width: 640px) {
  .timeline-item {
    grid-template-columns: minmax(0, 1fr);
  }
}

.timeline-item .bar {
  position: relative;
  display: inline-block;
  height: 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  overflow: hidden;
}

.timeline-item .bar span,
.timeline-item .bar::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.timeline-item .bar::after {
  background: linear-gradient(90deg, rgba(30, 64, 175, 0.9), #22d3ee);
  transform-origin: left;
}

.timeline-item[data-phase="dns"] .bar::after {
  background: linear-gradient(90deg, #22d3ee, #38bdf8);
}

.timeline-item[data-phase="connect"] .bar::after {
  background: linear-gradient(90deg, #38bdf8, #6366f1);
}

.timeline-item[data-phase="tls"] .bar::after {
  background: linear-gradient(90deg, #6366f1, #a855f7);
}

.timeline-item[data-phase="ttfb"] .bar::after {
  background: linear-gradient(90deg, #22c55e, #16a34a);
}

.timeline-item[data-phase="download"] .bar::after {
  background: linear-gradient(90deg, #eab308, #f97316);
}

.timeline-item .meta {
  font-size: 0.8rem;
}

.timeline-item .label {
  color: var(--color-text-primary);
}

.timeline-item .detail {
  color: var(--color-text-soft);
}

.timeline-item .time {
  font-variant-numeric: tabular-nums;
}

/* SECTION: Ping rounds */
.ping-section {
  margin-top: 16px;
}

.ping-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 6px;
}

.ping-caption {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

.ping-body {
  border-radius: 14px;
  border: 1px solid rgba(30, 64, 175, 0.7);
  background: radial-gradient(circle at top left, rgba(17, 24, 39, 0.95), #020617);
  padding: 8px 10px 10px;
}

.ping-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ping-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--color-text-primary);
}

.ping-item span {
  font-variant-numeric: tabular-nums;
}

.ping-item .ping-status {
  color: var(--color-text-soft);
}

.ping-item.ok .ping-status {
  color: var(--color-success);
}

.ping-item.fail .ping-status {
  color: var(--color-danger);
}

.ping-summary {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed rgba(148, 163, 184, 0.3);
  font-size: 0.8rem;
  color: var(--color-text-soft);
}

/* SECTION: Raw output */
.raw-section {
  margin-top: 16px;
}

.raw-output {
  width: 100%;
  min-height: 140px;
  max-height: 260px;
  padding: 10px 10px 10px;
  border-radius: 12px;
  border: 1px solid rgba(15, 23, 42, 0.8);
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.95), #020617);
  color: #e5e7eb;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.8rem;
  line-height: 1.5;
  resize: vertical;
  white-space: pre;
  white-space: pre-wrap;
}

.raw-output:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.9),
    0 0 0 4px rgba(34, 211, 238, 0.3);
}

/* SECTION: Source viewer */
.source-header {
  margin-bottom: 10px;
}

.source-toggle-row {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.chip {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: var(--color-text-soft);
  font-size: 0.78rem;
  padding: 4px 12px;
  cursor: pointer;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.chip:hover {
  background: rgba(15, 23, 42, 1);
  color: var(--color-text-primary);
}

.chip-active {
  border-color: var(--color-accent);
  background: rgba(34, 211, 238, 0.1);
  color: var(--color-accent-strong);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.35);
}

.chip:focus-visible {
  outline: none;
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.8),
    0 0 0 4px rgba(34, 211, 238, 0.35);
}

.code-shell {
  margin: 0;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 1);
  background: radial-gradient(circle at top, rgba(15, 23, 42, 1), #020617);
  padding: 10px 10px 12px;
  max-height: 320px;
  overflow: auto;
  font-size: 0.8rem;
}

#source-code {
  white-space: pre;
  white-space: pre-wrap;
}

/* SECTION: Utilities */
.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}