:root {
  --bg: #0d0e14;
  --surface: #161821;
  --surface2: #1e2030;
  --border: #2a2d42;
  --accent: #ff7300;
  --accent-hover: #e56500;
  --success: #3ecf8e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --danger-bg: #1e1010;
  --danger-border: #3d1515;
  --danger-bg-hover: #2a1313;
  --text: #e2e8f0;
  --muted: #8892b0;
  --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius: 8px;
}

[data-theme="light"] {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface2: #eef0f4;
  --border: #d0d4de;
  --accent: #ff7300;
  --accent-hover: #e56500;
  --success: #0d9e6a;
  --warning: #c97b00;
  --danger: #d93030;
  --danger-bg: #fde8e8;
  --danger-border: #f5b8b8;
  --danger-bg-hover: #fad4d4;
  --text: #1a1d2e;
  --muted: #5c6280;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

header h1 {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

header .badge {
  font-size: 0.7rem;
  background: var(--accent);
  color: #fff;
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

header .spacer { flex: 1; }

#theme-toggle {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 99px;
  padding: 5px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s, border-color 0.15s;
}

#theme-toggle:hover { background: var(--border); }

.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Sidebar tabs ── */
nav {
  width: 200px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 6px 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.nav-category { display: flex; flex-direction: column; }

.cat-header {
  background: var(--bg);
  border: none;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  text-align: left;
  padding: 10px 14px 8px;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s, background 0.15s;
}

.nav-category:first-child .cat-header { border-top: none; }

.cat-header:hover { color: var(--text); background: var(--surface); }

.cat-arrow {
  margin-left: auto;
  display: inline-block;
  transition: transform 0.2s ease;
  font-style: normal;
}

.nav-category:not(.open) .cat-arrow { transform: rotate(-90deg); }

.cat-items {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease;
}

.nav-category.open .cat-items { max-height: 600px; }

.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 300, 'GRAD' 0, 'opsz' 20;
  user-select: none;
}

.cat-icon {
  font-size: 15px;
  line-height: 1;
  flex-shrink: 0;
}

nav button[data-tab] {
  background: none;
  border: none;
  border-left: 3px solid transparent;
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 500;
  text-align: left;
  padding: 7px 14px 7px 20px;
  cursor: pointer;
  width: 100%;
  transition: background 0.15s, color 0.15s;
}

nav button[data-tab]:hover {
  background: var(--surface2);
  color: var(--accent);
}

nav button[data-tab].active {
  background: var(--surface2);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

/* ── Content ── */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-title .icon {
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

/* ── IO layout ── */
.io-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 760px) {
  nav { width: 140px; }
  .io-grid { grid-template-columns: 1fr; }
}

.io-box label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin-bottom: 6px;
}

textarea {
  width: 100%;
  height: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 12px;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
  line-height: 1.6;
}

textarea:focus { border-color: var(--accent); }
textarea.error { border-color: var(--danger); }
textarea::placeholder { color: var(--muted); opacity: 0.6; }

/* ── Buttons ── */
.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
  align-items: center;
}

button.btn {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

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

button.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
button.btn-secondary:hover { background: var(--border); }

button.btn-success { background: var(--success); color: #061a0e; }

button.btn-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger-border); }
button.btn-danger:hover { background: var(--danger-bg-hover); }

.btn-row .spacer { flex: 1; }

/* ── Error message ── */
.err-msg {
  font-size: 0.78rem;
  color: var(--danger);
  margin-top: 6px;
  min-height: 18px;
}

/* ── JWT specific ── */
.jwt-panels {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-top: 20px;
}

@media (max-width: 900px) {
  .jwt-panels { grid-template-columns: 1fr; }
}

.jwt-part {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.jwt-part-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.jwt-part-header.hdr { color: #f472b6; }
.jwt-part-header.pld { color: #34d399; }
.jwt-part-header.sig { color: #fbbf24; }

.jwt-part pre {
  padding: 12px;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text);
  min-height: 80px;
}

.jwt-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 14px;
  border: 1px solid transparent;
}

.jwt-status.valid   { background: #0d2b1e; border-color: #1a4a32; color: var(--success); }
.jwt-status.expired { background: #2b1212; border-color: #4a2020; color: var(--danger); }
.jwt-status.no-exp  { background: var(--surface2); border-color: var(--border); color: var(--muted); }

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.82rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 999;
}

#toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Text input (timestamp) ── */
input.text-input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s;
  min-width: 0;
}
input.text-input:focus { border-color: var(--accent); }
input.text-input.error { border-color: var(--danger); }
input.text-input::placeholder { color: var(--muted); opacity: 0.6; }

/* ── Hash results ── */
.hash-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.hash-algo {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  width: 68px;
  flex-shrink: 0;
}
.hash-value {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text);
  flex: 1;
  word-break: break-all;
}

/* ── Timestamp results ── */
.ts-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.ts-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  width: 110px;
  flex-shrink: 0;
}
.ts-value {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text);
  flex: 1;
}

/* ── Diff viewer ── */
.diff-stats {
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.diff-stat-add { color: var(--success); }
.diff-stat-del { color: var(--danger); }

.diff-pre {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}
.diff-pre .diff-add { display: block; color: var(--success); background: rgba(62,207,142,0.08); }
.diff-pre .diff-del { display: block; color: var(--danger);  background: rgba(239,68,68,0.08); }
.diff-pre .diff-eq  { display: block; color: var(--muted); }

/* ── Password Generator ── */
.pwgen-controls { margin-bottom: 16px; }
.pwgen-length-row { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.pwgen-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); flex-shrink: 0; }
input[type="range"] { flex: 1; accent-color: var(--accent); cursor: pointer; }
.pwgen-len-val { font-family: var(--mono); font-size: 0.85rem; color: var(--text); width: 32px; text-align: right; }
.pwgen-checkboxes { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.pwgen-check { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; cursor: pointer; }
.pwgen-check input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
.pwgen-result-row { margin-top: 16px; }
.pwgen-strength { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
.strength-bar-track { flex: 1; height: 6px; background: var(--surface2); border-radius: 3px; overflow: hidden; border: 1px solid var(--border); }
.strength-bar-fill { height: 100%; border-radius: 3px; transition: width 0.3s, background 0.3s; }
.str-weak   { background: var(--danger) !important; color: var(--danger) !important; }
.str-fair   { background: var(--warning) !important; color: var(--warning) !important; }
.str-good   { background: #4ade80 !important; color: #4ade80 !important; }
.str-strong { background: var(--success) !important; color: var(--success) !important; }
.strength-label { font-size: 0.72rem; font-weight: 700; width: 70px; }

/* ── Regex Tester ── */
.regex-pattern-row { display: flex; align-items: stretch; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.regex-slash { padding: 10px 12px; background: var(--surface2); color: var(--accent); font-family: var(--mono); font-size: 1rem; font-weight: 700; flex-shrink: 0; display: flex; align-items: center; }
.regex-flags { display: flex; gap: 10px; padding: 0 14px; background: var(--surface2); align-items: center; flex-shrink: 0; border-left: 1px solid var(--border); }
.regex-flags label { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); cursor: pointer; display: flex; align-items: center; gap: 4px; }
.regex-flags input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
.regex-stats { font-size: 0.78rem; font-weight: 600; color: var(--accent); margin-bottom: 8px; }
.regex-highlight { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px; font-family: var(--mono); font-size: 0.82rem; line-height: 1.8; min-height: 60px; max-height: 200px; overflow-y: auto; white-space: pre-wrap; word-break: break-all; color: var(--text); }
.regex-match { background: rgba(255,115,0,0.25); color: var(--accent); border-radius: 2px; padding: 0 2px; }
.regex-matches { display: flex; flex-direction: column; gap: 6px; }
.regex-match-item { display: flex; align-items: center; gap: 10px; padding: 6px 12px; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); font-size: 0.8rem; flex-wrap: wrap; }
.regex-match-num { background: var(--accent); color: #fff; border-radius: 50%; width: 18px; height: 18px; font-size: 0.65rem; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
.regex-match-val { font-family: var(--mono); background: rgba(255,115,0,0.1); padding: 1px 6px; border-radius: 4px; }
.regex-match-idx { color: var(--muted); font-size: 0.75rem; }
.regex-group { color: var(--muted); font-size: 0.75rem; }

/* ── UUID Generator ── */
.uuid-row { display: flex; align-items: center; gap: 12px; padding: 8px 14px; background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius); }
.uuid-value { font-family: var(--mono); font-size: 0.85rem; color: var(--text); flex: 1; }

/* ── HTTP Status Codes ── */
.http-category { margin-bottom: 18px; }
.http-cat-label { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); padding: 6px 0 6px; border-bottom: 1px solid var(--border); margin-bottom: 4px; }
.http-row { display: flex; align-items: flex-start; gap: 12px; padding: 7px 4px; border-bottom: 1px solid var(--border); font-size: 0.83rem; }
.http-row:last-child { border-bottom: none; }
.http-code { font-family: var(--mono); font-size: 0.78rem; font-weight: 700; padding: 2px 8px; border-radius: 4px; flex-shrink: 0; min-width: 44px; text-align: center; }
.http-1xx { background: rgba(100,150,255,0.12); color: #7eb8f7; }
.http-2xx { background: rgba(62,207,142,0.12); color: var(--success); }
.http-3xx { background: rgba(245,158,11,0.12); color: var(--warning); }
.http-4xx { background: rgba(239,68,68,0.12); color: var(--danger); }
.http-5xx { background: rgba(239,68,68,0.2); color: #ff6b6b; }
.http-name { font-weight: 600; flex-shrink: 0; min-width: 210px; }
.http-desc { color: var(--muted); font-size: 0.8rem; }

/* ── CORS Header Builder ── */
.cors-form { display: flex; flex-direction: column; gap: 14px; margin-bottom: 4px; }
.cors-field { display: flex; flex-direction: column; gap: 6px; }
.cors-label { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.cors-checkboxes { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.cors-checkboxes label { font-size: 0.82rem; cursor: pointer; display: flex; align-items: center; gap: 5px; }
.cors-checkboxes input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }

footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 10px 24px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted);
}