@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600;700&display=swap');

:root {
  --paper: #F6F4EF;
  --paper-dim: #EDEAE1;
  --ink: #1E3A4C;
  --ink-dim: #4A6273;
  --sage: #7C9885;
  --amber: #E8A33D;
  --text: #22262B;
  --text-soft: #5B6067;
  --line: #D8D3C6;
  --line-strong: #22262B;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.mono {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

/* ---------- Shared masthead ---------- */

.masthead {
  border-bottom: 2px solid var(--line-strong);
  padding: 0.7rem clamp(1rem, 4vw, 3rem);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.masthead-title {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.masthead-title .mark {
  font-family: 'IBM Plex Mono', monospace;
  color: var(--amber);
  font-weight: 600;
}

.masthead-tag {
  font-size: 0.75rem;
  color: var(--text-soft);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.85rem clamp(1rem, 4vw, 3rem) 2.5rem;
}

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
  font-size: 0.8125rem;
  color: var(--text-soft);
  text-align: center;
}

/* ---------- Index / toolboard ---------- */

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  margin: 0 0 0.75rem;
  max-width: 18ch;
}

.hero p {
  font-size: 1.0625rem;
  color: var(--text-soft);
  max-width: 46ch;
  margin: 0 0 2.5rem;
}

.section-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.4rem;
  margin: 1.5rem 0 0.75rem;
  display: flex;
  justify-content: space-between;
}

.section-label:first-of-type {
  margin-top: 0;
}

.category-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--sage);
  text-transform: lowercase;
  margin: 1.75rem 0 0.6rem;
}

.category-label:first-of-type {
  margin-top: 0.5rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.tool-card {
  background: var(--paper);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 150px;
  position: relative;
  transition: background 0.15s ease;
}

.tool-card.active:hover {
  background: var(--paper-dim);
}

.tool-card .index-no {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--sage);
}

.tool-card h3 {
  margin: 0;
  font-size: 1.0625rem;
}

.tool-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-soft);
  flex-grow: 1;
}

.tool-card .status {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6875rem;
  text-transform: lowercase;
}

.tool-card.active .status {
  color: var(--amber);
}

.tool-card.soon {
  color: var(--text-soft);
  cursor: default;
}

.tool-card.soon .status {
  color: var(--text-soft);
}

.tool-card.soon:hover {
  background: var(--paper);
}

/* ---------- Calculator page ---------- */

.tool-header {
  margin-bottom: 0.85rem;
}

.breadcrumb {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-dim);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 0.4rem;
}

.breadcrumb:hover {
  color: var(--ink);
}

.tool-header h1 {
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
  margin: 0 0 0.3rem;
}

.tool-header p {
  color: var(--text-soft);
  margin: 0;
  max-width: 50ch;
  font-size: 0.8125rem;
}

.input-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.6rem;
  padding: 0.75rem;
  background: var(--paper-dim);
  border: 1px solid var(--line-strong);
  margin-bottom: 0.85rem;
}

.input-row label {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.6875rem;
  color: var(--ink-dim);
}

.input-row input,
.input-row select,
.input-row textarea {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9375rem;
  padding: 0.3rem 0.45rem;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  border-radius: 0;
  width: 100%;
}

.input-row textarea {
  resize: vertical;
  line-height: 1.4;
}

.input-row input:focus,
.input-row select:focus,
.input-row textarea:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.results-list {
  border: 1px solid var(--line-strong);
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.result-row:last-child {
  border-bottom: none;
}

.result-row:nth-child(odd) {
  background: var(--paper-dim);
}

.result-label {
  font-size: 0.8125rem;
}

.result-sub {
  color: var(--text-soft);
  font-size: 0.6875rem;
}

.result-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.readout {
  border: 1px solid var(--line-strong);
  background: var(--ink);
  color: var(--paper);
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.readout .label {
  font-size: 0.8125rem;
  color: var(--sage);
  font-family: 'IBM Plex Mono', monospace;
}

.readout .value {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 2rem;
  font-weight: 600;
  color: var(--paper);
}

.readout .value.empty {
  color: var(--ink-dim);
  font-size: 1.25rem;
  font-weight: 400;
}

.expand-panel {
  border: 1px solid var(--line-strong);
  margin-top: 0.85rem;
}

.expand-panel summary {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink);
  padding: 0.65rem 0.9rem;
  cursor: pointer;
  background: var(--paper-dim);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.expand-panel summary::before {
  content: '+';
  color: var(--amber);
  font-weight: 700;
}

.expand-panel[open] summary::before {
  content: '−';
}

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

.expand-body {
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.channel-avatar {
  width: 64px;
  height: 64px;
  border: 1px solid var(--line-strong);
  object-fit: cover;
  align-self: flex-start;
}

.storage-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

.storage-row:last-child {
  border-bottom: none;
}

.storage-row:nth-child(odd) {
  background: var(--paper-dim);
}

.storage-key {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink);
  flex: 0 0 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.storage-value {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8125rem;
  color: var(--text-soft);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--line-strong);
  padding: 0.55rem 1.25rem;
  border-radius: 0;
  cursor: pointer;
}

.btn:hover {
  background: var(--ink-dim);
}

.btn:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.iss-map-wrap {
  position: relative;
  border: 1px solid var(--line-strong);
  overflow: hidden;
  margin-top: 0.85rem;
  line-height: 0;
}

.iss-map-wrap img {
  width: 100%;
  height: auto;
  display: block;
  filter: sepia(15%) saturate(70%);
}

.iss-marker {
  position: absolute;
  width: 12px;
  height: 12px;
  margin-left: -6px;
  margin-top: -6px;
  background: var(--amber);
  border: 2px solid var(--ink);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(232, 163, 61, 0.35);
}

.field {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9375rem;
  padding: 0.3rem 0.45rem;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  border-radius: 0;
  width: 100%;
}

.field:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.value-rows {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.value-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.value-row .field {
  flex: 1;
}

.btn-remove {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.875rem;
  background: none;
  border: 1px solid var(--line-strong);
  color: var(--text-soft);
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  cursor: pointer;
  border-radius: 0;
  line-height: 1;
}

.btn-remove:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.btn-secondary {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 600;
  background: none;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  padding: 0.45rem 1rem;
  border-radius: 0;
  cursor: pointer;
}

.btn-secondary:hover {
  background: var(--paper-dim);
}

.table-wrap {
  border: 1px solid var(--line-strong);
  overflow-x: auto;
}

.value-table {
  border-collapse: collapse;
  width: 100%;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8125rem;
  white-space: nowrap;
}

.value-table th,
.value-table td {
  padding: 0.4rem 0.65rem;
  text-align: right;
  border-bottom: 1px solid var(--line);
}

.value-table th {
  background: var(--ink);
  color: var(--paper);
  text-align: right;
  position: sticky;
  top: 0;
}

.value-table th:first-child,
.value-table td:first-child {
  text-align: left;
}

.value-table tbody tr:nth-child(odd) {
  background: var(--paper-dim);
}

.value-table-base {
  font-weight: 600;
  color: var(--ink);
}

/* ---------- SVG diagram ---------- */

.diagram-wrap {
  border: 1px solid var(--line-strong);
  background: #fff;
  margin-top: 0.85rem;
  padding: 0.5rem;
  display: flex;
  justify-content: center;
}

.diagram-wrap svg {
  width: 100%;
  max-width: 320px;
  height: auto;
}

.svg-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  fill: var(--ink);
  font-weight: 600;
}

.svg-label-muted {
  fill: var(--text-soft);
  font-weight: 400;
  font-size: 14px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}