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

:root {
  --bg:        #0d1117;
  --surface:   #161b22;
  --surface2:  #1c2330;
  --border:    #30363d;
  --accent:    #58a6ff;
  --accent2:   #3fb950;
  --accent3:   #f78166;
  --text:      #e6edf3;
  --text-muted:#8b949e;
  --pk:        #f0c674;
  --fk:        #79c0ff;
  --radius:    10px;
  --font-mono: 'Courier New', monospace;
}

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

/* ─── Header ────────────────────────────────────────────── */
header {
  padding: 2rem 2rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.logo-icon {
  font-size: 1.8rem;
  color: var(--accent);
  line-height: 1;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}

.tagline {
  color: var(--text-muted);
  font-size: .95rem;
}

/* ─── Main ──────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* ─── Upload ────────────────────────────────────────────── */
.upload-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color .2s, background .2s;
  cursor: pointer;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: #1a2233;
}

.drop-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
  padding: 3rem 2rem;
}

.drop-icon { font-size: 2.5rem; }

.drop-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.drop-sub {
  font-size: .9rem;
  color: var(--text-muted);
}

.btn-upload {
  margin-top: .5rem;
  padding: .55rem 1.4rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: .9rem;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}

.btn-upload:hover { border-color: var(--accent); color: var(--accent); }

/* File list */
.file-list {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}

.file-chip {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem .9rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: .85rem;
  color: var(--text);
}

.file-chip span { color: var(--accent2); }

/* Action row */
.action-row {
  display: flex;
  gap: .75rem;
  align-items: center;
  flex-wrap: wrap;
}

.btn-primary {
  padding: .65rem 1.6rem;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: .95rem;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  transition: opacity .2s;
}

.btn-primary:hover { opacity: .85; }

.btn-ghost {
  padding: .65rem 1.2rem;
  background: transparent;
  color: var(--text-muted);
  font-size: .9rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
  transition: color .2s;
}

.btn-ghost:hover { color: var(--accent3); border-color: var(--accent3); }

/* ─── Results ───────────────────────────────────────────── */
.results {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Export bar */
.export-bar {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}

.export-label {
  font-size: .85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-right: .25rem;
}

.btn-export {
  padding: .45rem 1.1rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: .85rem;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}

.btn-export:hover { border-color: var(--accent); color: var(--accent); }

/* Panels */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
}

/* ─── ER Diagram ────────────────────────────────────────── */
.diagram-wrap {
  overflow: auto;
  padding: 1.5rem;
  background: var(--bg);
}

#erDiagram {
  display: block;
  min-width: 300px;
}

/* ─── Schema Tables ─────────────────────────────────────── */
#schemaTables {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.schema-block {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem;
}

.schema-block:last-child { border-bottom: none; }

.schema-block h3 {
  font-size: .95rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: .5rem;
}

.schema-block h3::before {
  content: '▶';
  font-size: .7rem;
  color: var(--text-muted);
}

table.schema-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  font-family: var(--font-mono);
}

table.schema-table th {
  text-align: left;
  padding: .5rem .75rem;
  color: var(--text-muted);
  font-weight: 600;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  border-bottom: 1px solid var(--border);
}

table.schema-table td {
  padding: .5rem .75rem;
  border-bottom: 1px solid #1e2430;
  color: var(--text);
  vertical-align: middle;
}

table.schema-table tr:last-child td { border-bottom: none; }

table.schema-table tr:hover td { background: var(--surface2); }

.badge {
  display: inline-block;
  padding: .15rem .5rem;
  border-radius: 4px;
  font-size: .75rem;
  font-weight: 700;
  margin: 0 2px;
}

.badge-pk { background: #3a2f00; color: var(--pk); border: 1px solid #7a6200; }
.badge-fk { background: #0a2740; color: var(--fk); border: 1px solid #1a5080; }
.badge-null { color: var(--text-muted); font-size: .8rem; }
.badge-notnull { color: var(--accent2); font-size: .8rem; }

.type-chip {
  color: var(--accent2);
  font-size: .82rem;
}

/* ─── Footer ────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 1.25rem;
  color: var(--text-muted);
  font-size: .8rem;
  border-top: 1px solid var(--border);
}

/* ─── Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }