/* ================================================
   Signal — Design Tokens
   ================================================ */

:root {
  /* Palette — warm instrument aesthetic */
  --bg:          #111110;
  --bg-raised:   #1a1a18;
  --bg-surface:  #222220;
  --text:        #e8e4de;
  --text-muted:  #8a8680;
  --text-dim:    #5a5650;
  --accent:      #c9a96e;
  --accent-dim:  #c9a96e40;
  --border:      #2a2a28;
  --border-light:#3a3a38;
  --error:       #c45c4f;
  --success:     #6b9a73;

  /* Typography */
  --sans: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;

  /* Spacing scale */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  2rem;
  --space-xl:  4rem;
  --space-2xl: 8rem;

  /* Layout */
  --max-w: 1080px;
  --nav-h: 56px;
}

/* ================================================
   Reset & Base
   ================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 2rem);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

::selection {
  background: var(--accent);
  color: var(--bg);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}
a:hover { opacity: 0.75; text-decoration: underline; }

/* ================================================
   Grain Texture
   ================================================ */

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px;
}

/* ================================================
   Navigation
   ================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(17, 17, 16, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 100vw;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: 0.02em;
}
.nav-brand svg { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--text);
  opacity: 1;
}

.nav-endpoint {
  font-family: var(--mono);
  font-size: 0.75rem !important;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  text-transform: none !important;
}

/* ================================================
   Hero — Radar Section
   ================================================ */

.hero {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.0;
  color: var(--text);
  margin-bottom: var(--space-lg);
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 400px;
}

/* Radar visualization */
.hero-radar {
  display: flex;
  justify-content: center;
  align-items: center;
}

.radar-svg {
  width: 100%;
  max-width: 300px;
  height: auto;
}

.radar-ring {
  fill: none;
  stroke: var(--border-light);
  stroke-width: 0.5;
}

.radar-cross {
  stroke: var(--border-light);
  stroke-width: 0.5;
  opacity: 0.3;
}

.radar-sweep {
  stroke: var(--accent);
  stroke-width: 1.5;
  opacity: 0.7;
  transform-origin: 150px 150px;
  animation: sweep 4s linear infinite;
}

.radar-center {
  fill: var(--accent);
}

.radar-ticks line {
  stroke: var(--text-dim);
  stroke-width: 0.5;
}

/* Blips */
.radar-blip {
  fill: var(--accent);
  opacity: 0;
  animation: blip-pulse 4s ease-in-out infinite;
}
.radar-blip:nth-child(2) { animation-delay: 1.3s; }
.radar-blip:nth-child(3) { animation-delay: 2.7s; }

@keyframes sweep {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes blip-pulse {
  0%, 100% { opacity: 0; r: 2; }
  15%     { opacity: 0.9; r: 4; }
  60%     { opacity: 0.3; r: 3; }
}

/* Radar glow effect behind sweep */
.radar-svg::after {
  content: '';
  position: absolute;
  width: 50%;
  height: 50%;
  background: radial-gradient(ellipse at center, var(--accent-dim), transparent 70%);
  pointer-events: none;
}

/* ================================================
   Section Shared Styles
   ================================================ */

.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.section-number {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.section-header h2 {
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
}

/* ================================================
   Identity Readout
   ================================================ */

.identity {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border);
}

.readout-panel {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.readout-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.readout-status {
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}
.readout-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
  display: inline-block;
}
.readout-status.active {
  color: var(--success);
}
.readout-status.active::before {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}
.readout-status.scanning {
  color: var(--accent);
}
.readout-status.scanning::before {
  background: var(--accent);
  animation: status-blink 0.6s ease infinite;
}

@keyframes status-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

.readout-endpoint {
  color: var(--text-muted);
}

/* Fields */
.readout-fields {
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.readout-field {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-md);
  align-items: baseline;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border);
}
.readout-field:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.field-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.field-value {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text);
  word-break: break-all;
  transition: color 0.3s;
}
.field-value--wrap {
  word-break: break-word;
  line-height: 1.5;
}
.field-value.highlight {
  color: var(--accent);
}

/* Raw JSON */
.readout-raw {
  padding: var(--space-md);
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.readout-raw-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: var(--space-sm);
}

.readout-json {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Actions */
.readout-actions {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-top: 1px solid var(--border);
}

/* ================================================
   Buttons
   ================================================ */

.btn {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  border-radius: 4px;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
}
.btn--primary:hover {
  filter: brightness(1.1);
}
.btn--primary:active {
  filter: brightness(0.95);
  transform: scale(0.98);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn--ghost:hover {
  color: var(--text);
  border-color: var(--border-light);
}
.btn--ghost:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.btn--success {
  background: var(--success);
  color: var(--bg);
}

/* ================================================
   Console
   ================================================ */

.console-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border);
}

.console {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.console-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 10px var(--space-md);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

.console-dots {
  display: flex;
  gap: 6px;
}
.console-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-light);
}

.console-title {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.console-body {
  padding: var(--space-md);
  max-height: 320px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.8;
}

.console-line {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: 2px;
}

.console-prompt {
  color: var(--accent);
  user-select: none;
  flex-shrink: 0;
}

.console-text {
  color: var(--text-muted);
}

.console-url {
  color: var(--text);
}

.console-output {
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
  padding-left: calc(var(--space-sm) + 1ch + var(--space-sm));
  margin-bottom: var(--space-sm);
}

.console-error {
  color: var(--error);
}

.console-input-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--border);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.console-input {
  flex: 1;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text);
  background: transparent;
  border: none;
  outline: none;
  caret-color: var(--accent);
}

.console-run {
  background: var(--accent);
  color: var(--bg);
  border: none;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: filter 0.2s;
  flex-shrink: 0;
}
.console-run:hover { filter: brightness(1.15); }

/* ================================================
   Reference
   ================================================ */

.reference {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border);
}

.ref-block {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border);
}
.ref-block:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.ref-method {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.ref-path {
  color: var(--accent);
}

.ref-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  max-width: 560px;
}

.ref-code {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: var(--space-lg);
}

.ref-code-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

.ref-code pre {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: var(--space-md);
  line-height: 1.7;
  overflow-x: auto;
}

.ref-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.ref-field-row {
  display: flex;
  gap: var(--space-md);
  align-items: baseline;
  padding: var(--space-sm) 0;
  font-size: 0.85rem;
}

.ref-field-row code {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  white-space: nowrap;
  min-width: 100px;
}

.ref-field-row span {
  color: var(--text-muted);
  line-height: 1.5;
}

/* ================================================
   Footer
   ================================================ */

.footer {
  padding: 10px 0;
}

.footer-inner {
  max-width: 100vw;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

.footer-brand svg { color: var(--accent); animation: pulse 2s ease-in-out infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.footer-brand a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-brand a:hover {
  color: var(--text);
  text-decoration: underline;
}

.footer-center {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.footer-center a {
  transition: color 0.2s;
}

.footer-meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--success);
  border-radius: 4px;
  padding: 4px 10px;
}

.footer-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s ease-in-out infinite;

}

/* ================================================
   Scrollbar
   ================================================ */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

/* ================================================
   Responsive
   ================================================ */

@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    text-align: center;
  }

  .hero-desc {
    max-width: 100%;
  }

  .hero-radar {
    order: -1;
  }

  .radar-svg {
    max-width: 220px;
  }

  .readout-field {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .readout-actions {
    flex-direction: column;
  }

  .ref-field-row {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .ref-field-row code {
    min-width: unset;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .nav-links {
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .nav-links a:not(.nav-endpoint) {
    display: none;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .section-header h2 {
    font-size: 1.2rem;
  }
}