/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:          #f4f6f9;
  --surface:     #ffffff;
  --border:      #d1d9e0;
  --border-focus:#3b82f6;
  --text:        #1a202c;
  --text-muted:  #6b7280;
  --accent:      #2563eb;
  --accent-hover:#1d4ed8;
  --error-bg:    #fef2f2;
  --error-border:#fca5a5;
  --error-text:  #b91c1c;
  --result-bg:   #f0fdf4;
  --result-border:#86efac;
  --result-text: #166534;
  --radius:      8px;
  --shadow:      0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:   0 4px 12px rgba(0,0,0,.10);
  --font:        'Inter', system-ui, -apple-system, sans-serif;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 2rem 1rem 4rem;
}

/* ── Layout ───────────────────────────────────────────────── */
.container {
  max-width: 760px;
  margin: 0 auto;
}

/* ── Header ───────────────────────────────────────────────── */
header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.subtitle {
  margin-top: .4rem;
  font-size: .9rem;
  color: var(--text-muted);
}

/* ── Form card ────────────────────────────────────────────── */
form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem 2rem 2rem;
}

/* ── Grid ─────────────────────────────────────────────────── */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 1.5rem;
}

/* ── Field ────────────────────────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}

.field--full {
  grid-column: 1 / -1;
}

label {
  font-size: .82rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: .01em;
}

input[type="text"],
input[type="date"],
select {
  width: 100%;
  padding: .55rem .75rem;
  font-size: .95rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  appearance: none;
  -webkit-appearance: none;
}

select {
  background-image: 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' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.25rem;
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

input::placeholder {
  color: #b0b8c4;
}

.hint {
  font-size: .75rem;
  color: var(--text-muted);
}

/* ── Checkboxes ───────────────────────────────────────────── */
.checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem .5rem;
  margin-top: .1rem;
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .9rem;
  font-weight: 400;
  cursor: pointer;
  padding: .4rem .75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  transition: border-color .15s, background .15s;
  user-select: none;
}

.checkbox-label:hover {
  border-color: var(--border-focus);
  background: #eff6ff;
}

.checkbox-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-label:has(input:checked) {
  border-color: var(--accent);
  background: #eff6ff;
  color: var(--accent);
}

/* ── Actions ──────────────────────────────────────────────── */
.actions {
  margin-top: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .75rem;
}

/* ── Preset button & dropdown ─────────────────────────────── */
.preset-wrapper {
  position: relative;
}

.preset-btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .65rem 1.1rem;
  font-size: .9rem;
  font-family: var(--font);
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .15s, background .15s, box-shadow .15s;
  box-shadow: var(--shadow);
  white-space: nowrap;
}

.preset-btn svg {
  width: 10px;
  height: 7px;
  flex-shrink: 0;
  transition: transform .2s;
}

.preset-btn:hover {
  border-color: var(--border-focus);
  background: #eff6ff;
}

.preset-btn--open svg {
  transform: rotate(180deg);
}

.preset-menu {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  min-width: 280px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: .35rem 0;
  z-index: 100;
}

.preset-menu__item {
  padding: .6rem 1rem;
  font-size: .88rem;
  color: var(--text);
  cursor: pointer;
  transition: background .12s;
}

.preset-menu__item:hover {
  background: #eff6ff;
  color: var(--accent);
}

button[type="submit"] {
  padding: .65rem 1.75rem;
  font-size: .95rem;
  font-family: var(--font);
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s, box-shadow .15s, transform .1s;
  box-shadow: var(--shadow);
}

button[type="submit"]:hover {
  background: var(--accent-hover);
  box-shadow: var(--shadow-lg);
}

button[type="submit"]:active {
  transform: translateY(1px);
}

/* ── Result ───────────────────────────────────────────────── */
.result {
  margin-top: 1.25rem;
  background: var(--result-bg);
  border: 1px solid var(--result-border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
}

.result-inner {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.result-label {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: #15803d;
}

.result-name-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}

.result-name {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 600;
  font-family: 'Menlo', 'Consolas', 'Courier New', monospace;
  color: var(--result-text);
  word-break: break-all;
}

/* ── Copy button ──────────────────────────────────────────── */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .4rem .85rem;
  font-size: .82rem;
  font-family: var(--font);
  font-weight: 600;
  color: #15803d;
  background: #dcfce7;
  border: 1px solid #86efac;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .15s, border-color .15s;
  white-space: nowrap;
}

.copy-btn:hover {
  background: #bbf7d0;
  border-color: #4ade80;
}

.copy-btn svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

/* ── Name breakdown (explainshell-style legend) ───────────── */
.breakdown {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--result-border);
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.breakdown-segments {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .3rem;
}

.segment-separator {
  color: var(--text-muted);
  font-family: 'Menlo', 'Consolas', 'Courier New', monospace;
  font-weight: 600;
  user-select: none;
}

.segment {
  padding: .3rem .65rem;
  font-size: .88rem;
  font-family: 'Menlo', 'Consolas', 'Courier New', monospace;
  font-weight: 600;
  color: var(--seg-color, var(--text));
  background: var(--seg-bg, var(--bg));
  border: 1.5px solid var(--seg-color, var(--border));
  border-radius: 6px;
  cursor: pointer;
  transition: transform .12s, box-shadow .12s, background .12s;
}

.segment:hover,
.segment:focus-visible,
.segment.is-active {
  background: var(--seg-color, var(--border));
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
  outline: none;
}

.segment--label   { --seg-color: #2563eb; --seg-bg: #eff6ff; }
.segment--period  { --seg-color: #7c3aed; --seg-bg: #f5f3ff; }
.segment--device  { --seg-color: #0d9488; --seg-bg: #f0fdfa; }
.segment--grid    { --seg-color: #d97706; --seg-bg: #fffbeb; }
.segment--support { --seg-color: #db2777; --seg-bg: #fdf2f8; }
.segment--cert    { --seg-color: #4b5563; --seg-bg: #f9fafb; }

.breakdown-desc {
  min-height: 2.6em;
  padding: .6rem .85rem;
  font-size: .85rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* ── Error ────────────────────────────────────────────────── */
.error-box {
  margin-top: 1.25rem;
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  font-size: .9rem;
  color: var(--error-text);
  font-weight: 500;
}

/* ── Utility ──────────────────────────────────────────────── */
.hidden {
  display: none !important;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 560px) {
  form {
    padding: 1.25rem 1rem 1.5rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .field--full {
    grid-column: 1;
  }

  header h1 {
    font-size: 1.3rem;
  }
}