:root {
  --canvas: #e9dcc3;
  --canvas-deep: #dfd0b3;
  --panel: #f4ecdc;
  --panel-edge: rgba(43, 29, 20, 0.14);
  --espresso: #2b1d14;
  --espresso-2: #3d2b20;
  --espresso-soft: #5c483a;
  --ink-muted: rgba(43, 29, 20, 0.62);
  --brass: #b08d57;
  --brass-deep: #8f6f3f;
  --brass-light: #d9bb7f;
  --brass-pale: #f0dfb8;
  --rule: rgba(43, 29, 20, 0.18);
  --ok: #4f7a4a;
  --warn: #b5772b;
  --bad: #a3442f;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 10px;
  --maxw: 880px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--canvas);
  background-image: radial-gradient(1200px 600px at 20% -10%, rgba(255, 250, 240, 0.55), transparent 60%),
    radial-gradient(900px 500px at 110% 110%, rgba(176, 141, 87, 0.16), transparent 60%);
  background-attachment: fixed;
  color: var(--espresso);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  min-height: 100vh;
}

a {
  color: var(--brass-deep);
}

h1,
h2,
h3,
.serif {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 0;
}

/* ---------- top bar ---------- */

.topbar {
  background: var(--espresso);
  color: var(--brass-pale);
  border-bottom: 2px solid var(--brass);
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: env(safe-area-inset-top);
}

.topbar__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.wordmark {
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  color: var(--brass-light);
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}

.wordmark:hover {
  color: #f0dfb8;
}

.offline-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(240, 223, 184, 0.85);
  border: 1px solid rgba(217, 187, 127, 0.35);
  border-radius: 999px;
  padding: 4px 10px;
  white-space: nowrap;
}

.offline-pill:before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #7fb069;
  box-shadow: 0 0 0 3px rgba(127, 176, 105, 0.25);
}

.offline-pill--offline:before {
  background: #d9932b;
  box-shadow: 0 0 0 3px rgba(217, 147, 43, 0.25);
}

/* ---------- page scaffold ---------- */

.page {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 64px;
  padding-bottom: calc(64px + env(safe-area-inset-bottom));
}

.backlink {
  display: inline-block;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brass-deep);
  text-decoration: none;
  margin-bottom: 18px;
}

.backlink:hover {
  text-decoration: underline;
}

.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--brass-deep);
  margin-bottom: 6px;
}

.title {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.15;
  color: var(--espresso);
}

.subtitle {
  color: var(--ink-muted);
  margin: 8px 0 0;
  max-width: 60ch;
}

.rule {
  height: 3px;
  margin: 20px 0 28px;
  background: linear-gradient(90deg, var(--brass-deep), var(--brass-light) 45%, transparent);
  border-radius: 2px;
}

.tool-footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  align-items: flex-start;
}

.footnote {
  color: var(--ink-muted);
  font-size: 0.86rem;
  max-width: 60ch;
  margin: 0;
}

/* ---------- home ---------- */

.hero {
  margin-bottom: 28px;
}

.hero .title {
  font-size: clamp(2rem, 5vw, 2.8rem);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.tool-card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-left: 4px solid var(--brass);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.5), 0 1px 2px rgba(43, 29, 20, 0.08);
}

.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.5), 0 8px 18px rgba(43, 29, 20, 0.12);
  border-left-color: var(--brass-deep);
}

.tool-card h2 {
  font-size: 1.25rem;
  margin: 4px 0 6px;
}

.tool-card p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.tool-card--flagship {
  grid-column: 1 / -1;
  background: var(--espresso);
  color: var(--brass-pale);
  border-color: var(--brass);
}

.tool-card--flagship .tag {
  color: var(--brass-light);
}

.tool-card--flagship p {
  color: rgba(240, 223, 184, 0.75);
}

.tool-card--flagship h2 {
  color: #f4e7c8;
  font-size: 1.5rem;
}

/* ---------- sections & fields ---------- */

.section {
  margin-bottom: 26px;
}

.section-title {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass-deep);
  margin: 0 0 12px;
  font-family: var(--sans);
  font-weight: 600;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field__label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--espresso-2);
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.field__label small {
  color: var(--ink-muted);
  font-weight: 400;
}

.input {
  width: 100%;
  font: inherit;
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  padding: 10px 12px;
  border: 1px solid var(--panel-edge);
  border-radius: 8px;
  background: var(--panel);
  color: var(--espresso);
  min-width: 0;
  outline: none;
  transition: border-color 0.12s, box-shadow 0.12s;
}

.input:focus {
  border-color: var(--brass);
  box-shadow: 0 0 0 3px rgba(176, 141, 87, 0.25);
}

.input[aria-invalid="true"] {
  border-color: var(--bad);
}

.select {
  font: inherit;
  padding: 10px 32px 10px 12px;
  border: 1px solid var(--panel-edge);
  border-radius: 8px;
  background: var(--panel)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238f6f3f' stroke-width='1.6'/%3E%3C/svg%3E")
    no-repeat right 12px center;
  color: var(--espresso);
  -moz-appearance: none;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  outline: none;
  min-width: 0;
}

.select:focus {
  border-color: var(--brass);
  box-shadow: 0 0 0 3px rgba(176, 141, 87, 0.25);
}

.joined {
  display: flex;
  align-items: stretch;
}

.joined .input {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  flex: 1 1 auto;
}

.joined .select {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-left: 0;
  flex: 0 0 auto;
}

.joined .input:focus + .select {
  border-color: var(--brass);
}

.toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.toggle__btn {
  font: inherit;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid var(--panel-edge);
  background: transparent;
  color: var(--espresso-soft);
  cursor: pointer;
  line-height: 1.3;
}

.toggle__btn:hover {
  border-color: var(--brass);
  color: var(--espresso);
}

.toggle__btn[aria-pressed="true"] {
  background: var(--espresso);
  border-color: var(--espresso);
  color: var(--brass-light);
}

.field__hint {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.field__hint--error {
  color: var(--bad);
}

/* ---------- results ---------- */

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.result {
  background: var(--espresso);
  color: var(--brass-pale);
  border-radius: var(--radius);
  padding: 18px 20px 16px;
  border: 1px solid #1c120c;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.06), 0 6px 16px rgba(43, 29, 20, 0.18);
  min-width: 0;
}

.result--wide {
  grid-column: 1 / -1;
}

.result__label {
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(240, 223, 184, 0.65);
  margin-bottom: 8px;
}

.result__value {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, #f3dfae, #d9bb7f 38%, #b08d57, #e5c98a 72%, #c9a563);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  word-break: break-word;
}

.result__unit {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: rgba(240, 223, 184, 0.75);
  margin-left: 6px;
  -webkit-text-fill-color: rgba(240, 223, 184, 0.75);
}

.result__sub {
  margin-top: 8px;
  font-size: 0.86rem;
  color: rgba(240, 223, 184, 0.72);
}

.result__sub strong {
  color: #f0dfb8;
  font-weight: 600;
}

.result__formula {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: rgba(240, 223, 184, 0.5);
}

.badge {
  display: inline-block;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid currentColor;
  margin-left: 10px;
  vertical-align: middle;
  -webkit-text-fill-color: currentColor;
}

.badge--stable {
  color: #9bd08d;
}

.badge--adequate {
  color: #d9bb7f;
}

.badge--marginal {
  color: #f0b46a;
}

.badge--unstable {
  color: #f08d76;
}

.badge--high {
  color: #a9c7e8;
}

.badge--invalid {
  color: rgba(240, 223, 184, 0.6);
}

/* ---------- buttons & cards ---------- */

.btn {
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--espresso);
  background: var(--espresso);
  color: var(--brass-light);
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}

.btn:hover {
  background: var(--espresso-2);
}

.btn--ghost {
  background: transparent;
  color: var(--espresso);
  border-color: var(--panel-edge);
}

.btn--ghost:hover {
  background: rgba(43, 29, 20, 0.06);
  border-color: var(--brass);
}

.btn--danger {
  background: transparent;
  color: var(--bad);
  border-color: rgba(163, 68, 47, 0.4);
}

.btn--danger:hover {
  background: rgba(163, 68, 47, 0.08);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.status-msg {
  font-size: 0.84rem;
  color: var(--brass-deep);
}

.card {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: var(--radius);
  padding: 18px;
}

.card h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.card .lead {
  margin: 0 0 12px;
  font-size: 0.86rem;
  color: var(--ink-muted);
}

.mini-result {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 12px;
  font-variant-numeric: tabular-nums;
}

.mini-result span {
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.mini-result strong {
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--espresso);
}

/* ---------- install & update (PWA) ---------- */

.install-card {
  border-left: 4px solid var(--brass);
}

.install-steps {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--ink-muted);
  font-size: 0.88rem;
}

.install-steps li + li {
  margin-top: 4px;
}

.install-steps b {
  color: var(--espresso-2);
}

.page-footer {
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  justify-content: space-between;
  color: var(--ink-muted);
  font-size: 0.78rem;
}

.update-toast {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(18px + env(safe-area-inset-bottom));
  z-index: 50;
  max-width: min(520px, calc(100vw - 28px));
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  background: var(--espresso);
  color: var(--brass-pale);
  border: 1px solid var(--brass);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: 0 10px 30px rgba(43, 29, 20, 0.35);
}

.update-toast p {
  margin: 0;
  font-size: 0.88rem;
  flex: 1 1 180px;
}

.update-toast .btn {
  border-color: var(--brass);
  background: var(--brass);
  color: var(--espresso);
}

.update-toast .btn:hover {
  background: var(--brass-light);
}

.update-toast .btn--ghost {
  background: transparent;
  color: rgba(240, 223, 184, 0.8);
  border-color: rgba(217, 187, 127, 0.35);
}

.update-toast .btn--ghost:hover {
  background: rgba(240, 223, 184, 0.1);
}

@media (max-width: 480px) {
  .topbar__inner {
    padding: 10px 14px;
  }

  .page {
    padding: 20px 14px 48px;
    padding-bottom: calc(48px + env(safe-area-inset-bottom));
  }

  .wordmark {
    font-size: 1rem;
    letter-spacing: 0.1em;
  }
}

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

/* ---------- account / admin ---------- */

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar__link {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--brass-pale);
  text-decoration: none;
  white-space: nowrap;
}

.topbar__link:hover {
  color: #f0dfb8;
}

.badge--pending {
  color: var(--warn);
}

.badge--approved {
  color: var(--ok);
}

.badge--blocked {
  color: var(--bad);
}