:root {
  --bg: #0e0f11;
  --fg: #f3f3f4;
  --mute: #8a8e96;
  --dim: #5d6168;
  --line: #1f2125;
  --line-strong: #2b2e33;
  --card: #131416;
  --card-2: #17181b;
  --field: #0b0c0e;
  --amber: #e8912a;
  --amber-bright: #f0a246;
  --amber-soft: rgba(232, 145, 42, 0.12);
  --red: #e5484d;
  --radius: 12px;
}

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

html {
  background: var(--bg);
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(900px 420px at 50% -180px, rgba(232, 145, 42, 0.07), transparent 70%),
    var(--bg);
  color: var(--fg);
  font-family: Geist, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

[x-cloak] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.wrap {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(14, 15, 17, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 64px;
}

.brand {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  padding: 6px 11px;
  border-radius: 7px;
  color: var(--mute);
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.tab:hover {
  color: var(--fg);
  background: var(--card-2);
}

.tab.is-active {
  color: var(--fg);
  background: var(--card-2);
}

.header-link {
  padding: 6px 10px;
  border-radius: 7px;
  color: var(--mute);
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.header-link:hover {
  color: var(--fg);
  background: var(--card-2);
}

/* Hero */

.hero {
  padding: 52px 0 40px;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  max-width: 720px;
  font-size: clamp(2rem, 4.4vw, 3.25rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.hero h1 em {
  color: var(--amber);
  font-style: normal;
}

.hero p {
  max-width: 540px;
  margin-top: 14px;
  color: var(--mute);
  font-size: 15px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  margin-top: 22px;
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-meta span::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line-strong);
}

.hero-meta span:first-child::before {
  background: #4ade80;
}

.meta-link {
  color: var(--mute);
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: color 0.15s, text-decoration-color 0.15s;
}

.meta-link:hover {
  color: var(--amber);
  text-decoration-color: var(--amber);
}

/* Layout */

main {
  padding-bottom: 80px;
}

.panel {
  padding-top: 36px;
}

.panel-enter {
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.panel-enter-start {
  opacity: 0;
  transform: translateY(8px);
}

.panel-enter-end {
  opacity: 1;
  transform: translateY(0);
}

.anim-in {
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.anim-in-start {
  opacity: 0;
  transform: translateY(6px);
}

.anim-in-end {
  opacity: 1;
  transform: translateY(0);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.grid-main {
  display: grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-items: start;
}

.stack {
  display: grid;
  gap: 20px;
}

/* Cards */

.card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.card-head {
  margin-bottom: 16px;
}

.card-head h3 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card-head-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.card-head-row h3 {
  font-size: 14px;
  font-weight: 600;
}

.card-head-row span {
  color: var(--dim);
  font-size: 12px;
}

/* Forms */

.field {
  display: grid;
  gap: 6px;
}

.field + .field {
  margin-top: 13px;
}

.field label,
.field-label {
  color: var(--mute);
  font-size: 12px;
  font-weight: 500;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 13px;
}

.field-row .field + .field {
  margin-top: 0;
}

input,
select,
textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--field);
  color: var(--fg);
  font-size: 14px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:hover,
select:hover,
textarea:hover {
  border-color: #3a3e45;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-soft);
  outline: none;
}

textarea {
  resize: vertical;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 13px;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8e96' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  padding-right: 32px;
}

fieldset {
  border: 0;
}

legend {
  margin-bottom: 13px;
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.btn-primary {
  background: var(--amber);
  color: #121315;
}

.btn-primary:hover:not(:disabled) {
  background: var(--amber-bright);
}

.btn-ghost {
  border-color: var(--line-strong);
  color: var(--fg);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--card-2);
  border-color: #3a3e45;
}

.btn-block {
  width: 100%;
  margin-top: 18px;
}

.btn-sm {
  padding: 7px 12px;
  font-size: 13px;
}

.spinner {
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.data-note {
  margin-top: 12px;
  color: var(--dim);
  font-size: 11px;
}

.data-note button {
  color: var(--mute);
  font: inherit;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.data-note button:hover {
  color: var(--amber);
}

.hint {
  color: var(--dim);
  font-size: 11px;
}

.assumption-block {
  margin-top: 16px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card-2);
}

.assumption-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.assumption-head span {
  font-size: 12px;
  font-weight: 500;
}

.link-btn {
  color: var(--dim);
  font-size: 11px;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.link-btn:hover {
  color: var(--amber);
}

.assumption-block .field-row:first-of-type {
  margin-top: 0;
}

.assumptions {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.assumptions summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--mute);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.assumptions summary::-webkit-details-marker {
  display: none;
}

.assumptions summary::after {
  content: "+";
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 14px;
}

.assumptions[open] summary::after {
  content: "−";
}

.assumptions-body {
  display: grid;
  padding-top: 13px;
}

.assumptions-body .field-row:first-child {
  margin-top: 0;
}

.assumptions-body .btn {
  justify-self: start;
  margin-top: 14px;
}

/* Results */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card-2);
}

.metric-label {
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.metric-value {
  margin-top: 6px;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 19px;
  letter-spacing: -0.02em;
}

.metric-value.accent {
  color: var(--amber);
}

.result-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.result-title h3 {
  font-size: 15px;
  font-weight: 600;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid rgba(232, 145, 42, 0.24);
  border-radius: 999px;
  background: var(--amber-soft);
  color: var(--amber);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.empty {
  display: grid;
  place-items: center;
  min-height: 130px;
  padding: 24px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  color: var(--mute);
  text-align: center;
  font-size: 13px;
}

/* Data */

.dl {
  margin-top: 4px;
}

.dl div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.dl dt {
  color: var(--mute);
}

.dl dd {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 12px;
}

.formula {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  color: var(--mute);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.7;
  overflow-x: auto;
}

/* Charts */

.chart {
  position: relative;
  height: 220px;
}

.chart canvas {
  width: 100% !important;
  height: 100% !important;
}

/* Table */

.table-wrap {
  max-height: 260px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 12px;
}

th,
td {
  padding: 7px 10px;
  text-align: left;
  white-space: nowrap;
}

th {
  position: sticky;
  top: 0;
  background: var(--card-2);
  color: var(--dim);
  font-weight: 500;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

td {
  border-top: 1px solid var(--line);
}

td.num {
  text-align: right;
}

/* Errors */

.error {
  margin-bottom: 16px;
  padding: 10px 12px;
  border: 1px solid rgba(229, 72, 77, 0.35);
  border-radius: 8px;
  background: rgba(229, 72, 77, 0.08);
  color: #ff9b9e;
  font-size: 13px;
}

.note {
  margin-top: 12px;
  color: var(--dim);
  font-size: 12px;
}

/* API explorer */

.api-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.api-list {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 3px;
  max-height: calc(100vh - 120px);
  overflow: auto;
  padding-right: 4px;
}

.api-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--mute);
  font-size: 12px;
  text-align: left;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.api-item:hover {
  color: var(--fg);
  background: var(--card-2);
}

.api-item.is-active {
  color: var(--fg);
  background: var(--card-2);
  border-color: var(--line-strong);
}

.method {
  flex: 0 0 auto;
  min-width: 38px;
  padding: 2px 5px;
  border-radius: 4px;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-align: center;
}

.method-get {
  color: #7dd3a8;
  background: rgba(74, 222, 128, 0.1);
}

.method-post {
  color: var(--amber);
  background: var(--amber-soft);
}

.api-path {
  overflow: hidden;
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.api-detail {
  min-width: 0;
}

.api-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.api-head code {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 14px;
}

.api-desc {
  flex-basis: 100%;
  color: var(--mute);
  font-size: 12px;
}

.api-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.api-block + .api-block {
  margin-top: 16px;
}

.api-response-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.api-status {
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
}

.api-status.ok {
  color: #7dd3a8;
}

.api-status.bad {
  color: #ff9b9e;
}

.code {
  max-height: 340px;
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--field);
  color: var(--mute);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.code.request {
  max-height: 170px;
}

.field-label {
  margin-bottom: 6px;
  color: var(--dim);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Modal */

.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.modal-card {
  width: min(600px, 100%);
  max-height: 86vh;
  overflow: auto;
  padding: 22px;
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: var(--card);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.modal-head h2 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  color: var(--mute);
  font-size: 20px;
  line-height: 1;
  transition: color 0.15s, background 0.15s;
}

.icon-btn:hover {
  color: var(--fg);
  background: var(--card-2);
}

.modal-body {
  display: grid;
  gap: 16px;
}

.modal-enter {
  transition: opacity 0.18s ease;
}

.modal-enter-start,
.modal-leave-end {
  opacity: 0;
}

.modal-enter-end,
.modal-leave-start {
  opacity: 1;
}

.modal-leave {
  transition: opacity 0.14s ease;
}

.modal-card-start {
  opacity: 0;
  transform: translateY(8px) scale(0.99);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.modal-card-end {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.callout {
  display: grid;
  gap: 6px;
  padding: 14px;
  border: 1px solid rgba(232, 145, 42, 0.24);
  border-radius: 10px;
  background: var(--amber-soft);
  color: var(--mute);
  font-size: 13px;
}

.callout strong {
  color: var(--fg);
  font-weight: 500;
}

.inline-link {
  color: var(--amber);
  font-size: 12px;
  text-decoration: underline;
  text-decoration-color: rgba(232, 145, 42, 0.4);
  text-underline-offset: 3px;
}

.inline-link:hover {
  color: var(--amber-bright);
}

body.no-scroll {
  overflow: hidden;
}

/* Footer */

.site-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 12px;
}

.site-foot span {
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 11px;
}

.foot-links {
  display: flex;
  gap: 14px;
}

.foot-links button {
  color: var(--mute);
  font-size: 12px;
  transition: color 0.15s;
}

.foot-links button:hover {
  color: var(--fg);
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Responsive */

@media (max-width: 900px) {
  .grid-main,
  .split {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    padding: 44px 0 32px;
  }

  .api-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .api-list {
    position: static;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    max-height: none;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .api-item {
    white-space: nowrap;
  }
}

@media (max-width: 760px) {
  .wrap {
    width: calc(100% - 32px);
  }

  .header-inner {
    height: auto;
    flex-wrap: wrap;
    padding: 12px 0;
    gap: 10px;
  }

  .tabs {
    order: 3;
    width: 100%;
    padding-bottom: 2px;
  }

  .header-link {
    margin-left: auto;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .site-foot {
    flex-wrap: wrap;
  }

  .modal-card {
    padding: 18px;
  }
}

@media (max-width: 420px) {
  .metric-grid,
  .field-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-foot {
    flex-direction: column;
    align-items: flex-start;
  }
}