/* ── Variables ────────────────────────────────────────────────────────────── */
:root {
  --bg: #f8f9fa;
  --bg2: #ffffff;
  --bg3: #f0f2f5;
  --border: #dde1e7;
  --text: #1a1d21;
  --text2: #5a6170;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --valid: #16a34a;
  --invalid: #dc2626;
  --valid-bg: #dcfce7;
  --invalid-bg: #fee2e2;
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --radius: 8px;
  --font-mono: 'Fira Mono', 'Cascadia Code', 'Consolas', monospace;
}
.dark {
  --bg: #0f1117;
  --bg2: #1a1d25;
  --bg3: #242836;
  --border: #2e3347;
  --text: #e8eaf0;
  --text2: #8892a4;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-light: #1e3a5f;
  --valid: #4ade80;
  --invalid: #f87171;
  --valid-bg: #14532d;
  --invalid-bg: #450a0a;
  --shadow: 0 1px 3px rgba(0,0,0,.4);
}

/* ── Reset ────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
  transition: background .2s, color .2s;
}

/* ── Layout ───────────────────────────────────────────────────────────────── */
.app-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-left h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -.01em;
}
.header-left p {
  font-size: .8rem;
  color: var(--text2);
}
.header-right { display: flex; gap: .5rem; }

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ── Cards ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-header {
  padding: .65rem 1rem;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  font-size: .85rem;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .04em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-body { padding: 1rem; }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .45rem .85rem;
  font-size: .85rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  background: var(--bg3);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: .85rem;
  color: var(--text2);
  padding: .2rem .4rem;
  border-radius: 4px;
  transition: color .15s, background .15s;
}
.btn-icon:hover { color: var(--invalid); background: var(--invalid-bg); }
.btn-sm { padding: .3rem .6rem; font-size: .8rem; }

/* ── URL Input ────────────────────────────────────────────────────────────── */
.url-input-wrap {
  display: flex;
  gap: .5rem;
  align-items: stretch;
}
.url-input-wrap input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: .9rem;
}
.input-row { display: flex; flex-direction: column; gap: .35rem; }
.input-label { font-size: .85rem; font-weight: 600; color: var(--text2); }

input[type="text"], textarea {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: .5rem .75rem;
  font-size: .875rem;
  width: 100%;
  transition: border-color .15s;
  outline: none;
}
input[type="text"]:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* ── Examples select ──────────────────────────────────────────────────────── */
select {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: .45rem .75rem;
  font-size: .85rem;
  cursor: pointer;
  outline: none;
  width: 100%;
}
select:focus { border-color: var(--accent); }

/* ── Component grid ───────────────────────────────────────────────────────── */
.component-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: .75rem;
}
.component-field { display: flex; flex-direction: column; gap: .25rem; }
.component-field label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.component-field input {
  font-family: var(--font-mono);
  font-size: .82rem;
}
.component-field.wide { grid-column: 1 / -1; }

/* ── Query table ──────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
th {
  text-align: left;
  padding: .45rem .6rem;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text2);
  border-bottom: 2px solid var(--border);
}
td {
  padding: .35rem .5rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
.no-params { color: var(--text2); text-align: center; padding: 1rem; }
.param-key, .param-val {
  font-family: var(--font-mono);
  font-size: .82rem;
  padding: .3rem .5rem;
  width: 100%;
}
.param-value-wrap { display: flex; flex-direction: column; gap: .15rem; }
.param-raw {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--text2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}
.table-footer {
  padding: .6rem;
  border-top: 1px solid var(--border);
  background: var(--bg3);
}

/* ── Encode / Decode ──────────────────────────────────────────────────────── */
.encode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}
.encode-grid .group { display: flex; flex-direction: column; gap: .35rem; }
.encode-grid .group label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.encode-actions { display: flex; gap: .4rem; margin-top: .1rem; }
.output-row {
  display: flex;
  align-items: center;
  gap: .5rem;
}
.output-row input { flex: 1; background: var(--bg3); }

/* ── Validation panel ─────────────────────────────────────────────────────── */
#validation-panel { display: flex; flex-direction: column; gap: .6rem; }
.valid-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .75rem;
  border-radius: 20px;
  font-size: .85rem;
  font-weight: 700;
  width: fit-content;
}
.valid-badge.valid { background: var(--valid-bg); color: var(--valid); }
.valid-badge.invalid { background: var(--invalid-bg); color: var(--invalid); }
.info-row { display: flex; flex-direction: column; gap: .2rem; }
.info-label { font-size: .78rem; color: var(--text2); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.info-value { font-family: var(--font-mono); font-size: .82rem; word-break: break-all; }
.short-form { color: var(--accent); }

/* ── Rebuilt URL ──────────────────────────────────────────────────────────── */
.rebuilt-row {
  display: flex;
  gap: .5rem;
  align-items: center;
}
.rebuilt-row input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: .88rem;
  background: var(--accent-light);
  border-color: var(--accent);
  font-weight: 600;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .encode-grid { grid-template-columns: 1fr; }
  .component-grid { grid-template-columns: 1fr 1fr; }
  .url-input-wrap { flex-direction: column; }
}