:root {
  --bg: #f0f2f5;
  --card: #ffffff;
  --primary: #2c7be5;
  --primary-hover: #1a5fc7;
  --danger: #e74c3c;
  --danger-hover: #c0392b;
  --text: #2d3748;
  --text-muted: #6e84a3;
  --border: #e2e8f0;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

/* ---------- Layout ---------- */

.header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}

.header h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.header h1 span { color: var(--text-muted); font-weight: 400; }

.container { max-width: 1200px; margin: 0 auto; padding: 24px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 12px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s;
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { background: #a0b4d0; cursor: not-allowed; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-outline:hover { background: #f7f8fa; }

.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ---------- Login ---------- */

.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}

.login-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0,0,0,.08);
  padding: 32px;
  width: 360px;
  text-align: center;
}

.login-box h2 {
  font-size: 18px;
  margin-bottom: 4px;
}

.login-box p {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: 20px;
}

.login-box input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  margin-bottom: 12px;
  outline: none;
}

.login-box input:focus { border-color: var(--primary); }

.login-box .btn { width: 100%; justify-content: center; }

.login-error { color: var(--danger); font-size: 12px; margin-bottom: 8px; }

/* ---------- Dropzone ---------- */

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--text-muted);
  transition: border-color .15s, background .15s;
  cursor: pointer;
}

.dropzone.active {
  border-color: var(--primary);
  background: #eef4fc;
}

.dropzone p { margin-bottom: 8px; }
.dropzone .hint { font-size: 12px; }

/* ---------- File list ---------- */

.file-list { margin-top: 12px; }

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 6px;
  font-size: 13px;
}

.file-item .name { flex: 1; font-weight: 500; }
.file-item .size { color: var(--text-muted); margin: 0 12px; min-width: 60px; }
.file-item .remove {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 16px;
  padding: 2px 6px;
  border-radius: 4px;
}
.file-item .remove:hover { background: #fdecea; }

/* ---------- Action bar ---------- */

.action-bar {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* ---------- Summary stats ---------- */

.stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.stat-box {
  flex: 1;
  min-width: 120px;
  background: #f7f9fc;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  text-align: center;
}

.stat-box .value {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}

.stat-box .label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .3px;
}

/* ---------- Data table ---------- */

.table-wrap {
  overflow-x: auto;
  margin-top: 12px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}

.data-table th,
.data-table td {
  padding: 6px 10px;
  border: 1px solid var(--border);
}

.data-table th {
  background: #1a5276;
  color: #fff;
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .3px;
  position: sticky;
  top: 0;
  z-index: 1;
}

.data-table th:last-child {
  background: #2980b9;
}

.data-table tbody tr:nth-child(even) { background: #f8f9fa; }
.data-table tbody tr:hover { background: #eef4fc; }

.data-table td:first-child { font-weight: 500; }

.data-table td.num { text-align: right; }
.data-table td.dash { text-align: center; color: #bbb; }
.data-table td.zero { text-align: right; color: var(--danger); font-weight: 500; }

.data-table td.total-col {
  text-align: right;
  font-weight: 600;
  background: #d4edfc;
  color: #1a5276;
}

/* ---------- Misc ---------- */

.hidden { display: none !important; }

.spinner {
  display: inline-block;
  width: 16px; height: 16px;
  border: 2px solid #fff;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #2d3748;
  color: #fff;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
  z-index: 1000;
  animation: fadeIn .2s;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- Homepage tools grid ---------- */

.btn-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 16px;
  transition: background .15s, color .15s;
}
.btn-back:hover { background: var(--border); color: var(--text); }

.header-link {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}
.header-link:hover { color: var(--primary); }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
  cursor: pointer;
  display: block;
}

.tool-card:hover {
  border-color: var(--primary);
  box-shadow: 0 2px 8px rgba(44,123,229,.15);
}

.tool-card .tool-icon { font-size: 28px; margin-bottom: 10px; }
.tool-card .tool-name { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.tool-card .tool-desc { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

.tool-coming-soon {
  opacity: .45;
  cursor: default;
  border-style: dashed;
}
.tool-coming-soon:hover {
  border-color: var(--border);
  box-shadow: var(--shadow);
}