:root {
  --bg: #f7f5f0;
  --card: #fff;
  --accent: #2d5a3d;
  --accent-hover: #224a30;
  --accent-light: #e8f0eb;
  --text: #1a1a1a;
  --text-muted: #747474;
  --border: #e2dfd8;
  --danger: #b5412a;
  --danger-bg: #fdf0ed;
  --mono: "DM Mono", ui-monospace, monospace;
  --sans: "DM Sans", system-ui, sans-serif;
  --radius: 12px;
}

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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
}

.container {
  width: 100%;
  max-width: 560px;
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
}

.tab,
button {
  font-family: var(--sans);
}

.tab {
  flex: 1;
  padding: 9px 12px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: 150ms ease;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  background: var(--accent);
  color: #fff;
}

.tab-page:not(.active) {
  display: none;
}

h1 {
  margin-bottom: 4px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  margin-bottom: 20px;
  color: var(--text-muted);
  font-size: 0.82rem;
}

.card {
  margin-bottom: 16px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}

label,
.result-card > label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

textarea,
input[type="number"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  transition: border-color 200ms;
}

textarea {
  min-height: 120px;
  padding: 14px;
  resize: vertical;
  font-size: 0.85rem;
  line-height: 1.6;
}

input[type="number"] {
  padding: 12px 14px;
  font-size: 0.95rem;
  appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  margin: 0;
  appearance: none;
}

textarea:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgb(45 90 61 / 12%);
}

button:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.field-row,
.btn-row {
  display: flex;
  gap: 12px;
}

.field {
  flex: 1;
  min-width: 0;
}

.btn-row {
  gap: 10px;
  margin-top: 16px;
}

.btn-row button,
.copy-btn {
  padding: 10px 20px;
  border: 0;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 150ms, transform 100ms;
}

button:active {
  transform: scale(0.97);
}

.btn-primary {
  flex: 1;
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover,
.copy-btn:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  border: 1px solid var(--border) !important;
  background: var(--bg);
  color: var(--text-muted);
}

.btn-secondary:hover {
  background: #edeae4;
}

.result-card {
  display: none;
}

.result-card.visible {
  display: block;
}

.result-link {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  padding: 14px;
  border-radius: 8px;
  background: var(--accent-light);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  word-break: break-all;
}

.result-link span {
  flex: 1;
  user-select: all;
}

.copy-btn {
  flex-shrink: 0;
  padding: 5px 12px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  white-space: nowrap;
}

.copy-btn.copied {
  background: #3a7a52;
}

.error {
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger);
  font-size: 0.82rem;
}

.hint {
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.5;
}

.env-result {
  padding: 16px;
  border-radius: 8px;
  background: var(--accent-light);
}

.env-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
}

.env-row:first-child { padding-top: 0; }
.env-row:last-child { padding-bottom: 0; }
.env-row + .env-row { border-top: 1px solid var(--border); }

.env-label {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.env-value {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: right;
}

.env-value.big {
  color: var(--text);
  font-size: 1rem;
}

.env-short {
  margin-left: 4px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 400;
}

.env-divider {
  margin: 10px 0 6px;
  border: 0;
  border-top: 1px dashed var(--border);
}

.env-raw-label {
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.env-raw-value {
  flex: 1;
  padding: 2px 0;
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 0.8rem;
  word-break: break-all;
  user-select: all;
}

.env-raw-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

@media (max-width: 520px) {
  body { align-items: flex-start; padding: 16px; }
  .tabs { overflow-x: auto; }
  .tab { min-width: max-content; padding-inline: 10px; }
  .card { padding: 18px; }
  .field-row { flex-direction: column; }
  .env-row { align-items: flex-start; flex-direction: column; gap: 4px; }
  .env-value { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}