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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2e3147;
  --accent: #60c080;
  --accent-dim: #3a7a50;
  --text: #e2e4f0;
  --text-dim: #8892b0;
  --res: #4a4e6a;
  --res-text: #636987;
  --font-mono: "Cascadia Code", "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --font-sans: system-ui, -apple-system, sans-serif;
  --radius: 6px;
  --badge-m:   rgba(238,100,100,0.18);
  --badge-m-t: #e87070;
  --badge-s:   rgba(91,141,238,0.18);
  --badge-s-t: #5b8dee;
  --badge-u:   rgba(80,200,130,0.18);
  --badge-u-t: #50c882;
  --badge-rw:  rgba(91,141,238,0.10);
  --badge-rw-t: #7aa0e8;
  --badge-ro:  rgba(150,150,150,0.15);
  --badge-ro-t: #aaa;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

header {
  padding: 2rem 2rem 1rem;
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.3rem 0.7rem;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}

.github-link:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

header h1 {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.9rem;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 2rem;
}

/* ── Inputs ─────────────────────────────────── */

.inputs {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

#reg-group {
  flex: 1;
  min-width: 220px;
}

label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

input[type="text"] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.55rem 0.8rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

input[type="text"]::placeholder {
  color: var(--res-text);
}

/* ── Autocomplete dropdown ───────────────────── */

.autocomplete-wrapper {
  position: relative;
}

.dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  list-style: none;
  max-height: 280px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.dropdown li {
  padding: 0.45rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.dropdown li .dd-name {
  flex-shrink: 0;
}

.dropdown li .dd-addr {
  font-size: 0.75rem;
  color: var(--accent);
  flex-shrink: 0;
}

.dropdown li .dd-long {
  color: var(--text-dim);
  font-size: 0.76rem;
  font-family: var(--font-sans);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropdown li .dd-priv {
  font-size: 0.7rem;
  border-radius: 3px;
  padding: 0.1em 0.35em;
  flex-shrink: 0;
}

.dropdown li .dd-priv.M { background: var(--badge-m); color: var(--badge-m-t); }
.dropdown li .dd-priv.S { background: var(--badge-s); color: var(--badge-s-t); }
.dropdown li .dd-priv.U { background: var(--badge-u); color: var(--badge-u-t); }

.dropdown li:hover,
.dropdown li[aria-selected="true"] {
  background: var(--border);
}

/* ── Register info header ────────────────────── */

#reg-info {
  animation: fade-in 0.15s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.reg-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

#reg-title {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.reg-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.priv-badge, .access-badge, .addr-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.15em 0.55em;
  border-radius: 3px;
}

.priv-badge.M { background: var(--badge-m); color: var(--badge-m-t); }
.priv-badge.S { background: var(--badge-s); color: var(--badge-s-t); }
.priv-badge.U { background: var(--badge-u); color: var(--badge-u-t); }
.priv-badge   { background: var(--border);  color: var(--text-dim); }

.access-badge { background: var(--badge-rw); color: var(--badge-rw-t); }
.access-badge.RO { background: var(--badge-ro); color: var(--badge-ro-t); }

.addr-badge { background: rgba(96,192,128,0.12); color: var(--accent); }

.reg-desc {
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-top: 0.15rem;
  max-width: 700px;
}

.spec-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 0.3rem 0.7rem;
  transition: background 0.15s;
  flex-shrink: 0;
}

.spec-link:hover {
  background: rgba(96, 192, 128, 0.1);
}

/* ── Bit fields table ────────────────────────── */

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

thead th {
  background: var(--surface);
  padding: 0.55rem 0.85rem;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

tbody tr.is-reserved {
  color: var(--res-text);
}

tbody tr.is-reserved:hover {
  background: transparent;
}

tbody td {
  padding: 0.5rem 0.85rem;
  vertical-align: top;
}

td.bits, td.field-name, td.field-val, td.field-type {
  font-family: var(--font-mono);
  white-space: nowrap;
}

td.bits {
  color: var(--text-dim);
  width: 6rem;
}

td.field-name {
  width: 9rem;
}

td.field-type {
  width: 5rem;
  font-size: 0.78rem;
  color: var(--text-dim);
}

td.field-val {
  width: 7rem;
}

td.field-val .hex {
  color: var(--accent);
}

td.field-val .bin {
  color: var(--text-dim);
  font-size: 0.78rem;
}

td.meaning {
  color: var(--text-dim);
  line-height: 1.4;
}

td.meaning .enum-match {
  color: var(--text);
  font-weight: 500;
}

td.meaning .desc {
  font-size: 0.82rem;
  margin-top: 0.1rem;
  color: var(--text-dim);
}

/* ── Reserved row styling ────────────────────── */

tr.is-reserved td.field-name { color: var(--res-text); }
tr.is-reserved td.bits { color: var(--res); }
tr.is-reserved td.field-val .hex { color: var(--res-text); }
tr.is-reserved td.field-type { color: var(--res); }

/* ── Notices ─────────────────────────────────── */

.notice {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 1rem;
}

.notice code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

/* ── Disclaimer ──────────────────────────────── */

.disclaimer {
  margin-top: 2rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.disclaimer a {
  color: var(--text-dim);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* ── Scrollbar ───────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }