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

:root {
  --bg:         #0f1117;
  --bg-card:    #1a1d27;
  --bg-sidebar: #13151f;
  --border:     #2a2d3e;
  --accent:     #6c63ff;
  --accent2:    #00d2ff;
  --text:       #e2e8f0;
  --text-muted: #7b8299;
  --success:    #22c55e;
  --danger:     #ef4444;
  --warn:       #f59e0b;
  --radius:     12px;
  --shadow:     0 4px 24px rgba(0,0,0,.4);
  --font:       'Segoe UI', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── HEADER ── */
.site-header {
  background: linear-gradient(135deg, #1a1d27 0%, #13151f 100%);
  border-bottom: 1px solid var(--border);
  padding: 1.2rem 2rem;
}
.header-inner { max-width: 1400px; margin: 0 auto; }
.logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -.5px;
}
.logo-icon { font-size: 1.8rem; }
.accent { color: var(--accent); }
.header-sub {
  color: var(--text-muted);
  font-size: .85rem;
  margin-top: .2rem;
  letter-spacing: .5px;
}

/* ── LAYOUT ── */
.layout {
  display: flex;
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  gap: 0;
}

/* ── SIDEBAR ── */
.sidebar {
  width: 220px;
  min-width: 220px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 1.5rem .8rem;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar ul { list-style: none; display: flex; flex-direction: column; gap: .4rem; }
.nav-btn {
  display: flex;
  align-items: center;
  gap: .7rem;
  width: 100%;
  padding: .75rem 1rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background .2s, color .2s;
}
.nav-btn:hover { background: rgba(108,99,255,.12); color: var(--text); }
.nav-btn.active { background: rgba(108,99,255,.2); color: var(--accent); }
.nav-icon { font-size: 1.1rem; }

/* ── CONTENT ── */
.content { flex: 1; padding: 2rem; overflow-y: auto; }

/* ── TABS ── */
.tab { display: none; }
.tab.active { display: block; }

/* ── CARDS ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  max-width: 820px;
}
.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: .5rem;
}
.card-desc {
  color: var(--text-muted);
  font-size: .92rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}
.card-desc code, code {
  background: rgba(108,99,255,.15);
  color: var(--accent2);
  padding: .1em .35em;
  border-radius: 4px;
  font-size: .88em;
  font-family: 'Consolas', monospace;
}

/* ── DROP ZONE ── */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  margin-bottom: 1.2rem;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(108,99,255,.06);
}
.drop-icon { font-size: 2.5rem; display: block; margin-bottom: .6rem; }

/* ── FILE PREVIEW ── */
.file-preview {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.2rem;
}
.file-tag {
  background: rgba(108,99,255,.15);
  border: 1px solid rgba(108,99,255,.3);
  color: var(--text);
  padding: .3rem .75rem;
  border-radius: 99px;
  font-size: .82rem;
  display: flex;
  align-items: center;
  gap: .4rem;
}
.file-tag .remove-tag {
  cursor: pointer;
  color: var(--text-muted);
  font-size: .9rem;
  line-height: 1;
}
.file-tag .remove-tag:hover { color: var(--danger); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .6rem 1.3rem;
  border-radius: 8px;
  border: none;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .2s, transform .1s;
  text-decoration: none;
}
.btn:hover { opacity: .88; }
.btn:active { transform: scale(.97); }
.btn-primary  { background: var(--accent);  color: #fff; }
.btn-success  { background: var(--success); color: #fff; }
.btn-danger   { background: var(--danger);  color: #fff; }
.btn-ghost    { background: transparent; border: 1px solid var(--border); color: var(--text-muted); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: .35rem .75rem; font-size: .8rem; }

.action-row { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.2rem; }

/* ── FORM ELEMENTS ── */
.form-group { margin-bottom: 1rem; }
.form-group label {
  display: block;
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: .4rem;
  font-weight: 500;
}
.form-group input[type="text"] {
  width: 100%;
  max-width: 420px;
  padding: .65rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: .95rem;
  outline: none;
  transition: border-color .2s;
}
.form-group input[type="text"]:focus { border-color: var(--accent); }

/* ── INFO & EXAMPLE BOXES ── */
.info-box {
  background: rgba(0,210,255,.07);
  border: 1px solid rgba(0,210,255,.2);
  border-radius: 8px;
  padding: .85rem 1.1rem;
  font-size: .88rem;
  color: var(--text);
  margin-bottom: 1.2rem;
  line-height: 1.6;
}
.example-note {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

/* ── CATEGORY CHIPS ── */
.category-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.5rem;
}
.cat-chip {
  background: rgba(108,99,255,.12);
  border: 1px solid rgba(108,99,255,.25);
  color: var(--text);
  padding: .35rem .85rem;
  border-radius: 99px;
  font-size: .82rem;
}

/* ── RESULT BOX ── */
.result-box {
  margin-top: 1.3rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}
.result-box.hidden { display: none; }
.result-header {
  padding: .65rem 1rem;
  font-size: .88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: .5rem;
}
.result-header.success { background: rgba(34,197,94,.12);  color: var(--success); }
.result-header.error   { background: rgba(239,68,68,.12);  color: var(--danger);  }
.result-body {
  padding: .8rem 1rem;
  background: var(--bg);
  max-height: 280px;
  overflow-y: auto;
}
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
.result-table th {
  text-align: left;
  padding: .4rem .6rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}
.result-table td {
  padding: .4rem .6rem;
  border-bottom: 1px solid rgba(42,45,62,.6);
  color: var(--text);
  word-break: break-all;
}

/* ── FILE BROWSER ── */
.files-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: .5rem;
}
.files-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .75rem 1rem;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid var(--border);
}
.panel-header h3 { font-size: .95rem; font-weight: 600; }
.file-list {
  list-style: none;
  max-height: 320px;
  overflow-y: auto;
  padding: .5rem 0;
}
.file-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .55rem 1rem;
  font-size: .85rem;
  border-bottom: 1px solid rgba(42,45,62,.4);
  gap: .5rem;
}
.file-list li:last-child { border-bottom: none; }
.file-list li .fname {
  word-break: break-all;
  color: var(--text);
}
.file-list li a.dl-btn {
  min-width: 80px;
  text-align: center;
  padding: .3rem .65rem;
  font-size: .78rem;
}
.empty-msg { color: var(--text-muted) !important; font-style: italic; justify-content: center !important; }

/* ── SPINNER ── */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── TOAST ── */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  color: var(--text);
  padding: .9rem 1.4rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: .9rem;
  z-index: 9999;
  max-width: 340px;
  transition: opacity .3s, transform .3s;
}
.toast.hidden { opacity: 0; pointer-events: none; transform: translateY(10px); }
.toast.success { border-left-color: var(--success); }
.toast.error   { border-left-color: var(--danger);  }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: relative; border-right: none; border-bottom: 1px solid var(--border); padding: .8rem; }
  .sidebar ul { flex-direction: row; flex-wrap: wrap; }
  .nav-btn { padding: .5rem .75rem; font-size: .82rem; }
  .files-wrapper { grid-template-columns: 1fr; }
  .content { padding: 1.2rem; }
  .card { padding: 1.2rem; }
}