:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-2: #eef1f5;
  --border: #d9dee6;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --ok: #16a34a;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.hidden { display: none !important; }

/* --- Login --- */
.login-box {
  max-width: 320px;
  margin: 12vh auto 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow);
}
.login-box h1 { margin: 0; font-size: 28px; letter-spacing: 1px; }
.login-box .subtitle { color: var(--muted); margin: 4px 0 24px; }
.login-box input {
  width: 100%; padding: 10px 12px; margin-bottom: 12px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text);
}
.login-box input:focus,
.inline-form input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.login-box button {
  width: 100%; padding: 10px; border: none; border-radius: 8px;
  background: var(--accent); color: #fff; font-weight: 600; cursor: pointer;
}

/* --- Header --- */
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px; border-bottom: 1px solid var(--border);
  background: var(--panel); box-shadow: var(--shadow);
}
.brand { font-weight: 700; font-size: 18px; }
.brand .tag { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 6px; }
.header-right { display: flex; align-items: center; gap: 12px; color: var(--muted); }

/* --- Layout --- */
.layout { display: flex; height: calc(100vh - 53px); }
.sidebar {
  width: 240px; border-right: 1px solid var(--border);
  background: var(--panel); overflow-y: auto;
}
.sidebar-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; font-weight: 600; color: var(--muted);
  text-transform: uppercase; font-size: 12px; letter-spacing: .5px;
}
#project-list { list-style: none; margin: 0; padding: 0; }
#project-list li {
  padding: 10px 16px; cursor: pointer; border-left: 3px solid transparent;
}
#project-list li:hover { background: var(--panel-2); }
#project-list li.active { background: var(--panel-2); border-left-color: var(--accent); }

.content { flex: 1; overflow-y: auto; padding: 24px 32px; }
.empty-hint { color: var(--muted); text-align: center; margin-top: 20vh; }

.panel-head { display: flex; justify-content: space-between; align-items: center; }
.panel-head h2 { margin: 0; }

/* --- Tabs --- */
.tabs { display: flex; gap: 4px; margin: 20px 0 16px; border-bottom: 1px solid var(--border); }
.tab {
  background: none; border: none; color: var(--muted); padding: 10px 16px;
  cursor: pointer; border-bottom: 2px solid transparent; font-size: 14px;
}
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

/* --- Forms + tables --- */
.inline-form { display: flex; gap: 8px; margin-bottom: 16px; }
.inline-form input {
  flex: 1; padding: 8px 10px; background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 6px; color: var(--text);
}
.inline-form button, .data-table button {
  padding: 8px 14px; border: none; border-radius: 6px;
  background: var(--accent); color: #fff; cursor: pointer; white-space: nowrap;
}
.login-box button:hover,
.inline-form button:hover { filter: brightness(0.93); }
.danger-btn:hover { background: var(--danger); color: #fff; }
.row-del:hover { border-color: var(--danger) !important; background: rgba(220, 38, 38, 0.06) !important; }

.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td {
  text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border);
  vertical-align: top; word-break: break-all;
}
.data-table th { color: var(--muted); font-weight: 600; font-size: 12px; }
.data-table code { color: var(--accent); }

/* --- Buttons --- */
.icon-btn {
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  width: 24px; height: 24px; border-radius: 6px; cursor: pointer; line-height: 1;
}
.link-btn { background: none; border: none; color: var(--accent); cursor: pointer; }
.danger-btn {
  background: transparent; border: 1px solid var(--danger); color: var(--danger);
  padding: 6px 12px; border-radius: 6px; cursor: pointer;
}
.row-del {
  background: transparent !important; border: 1px solid var(--border) !important;
  color: var(--danger) !important; padding: 4px 10px !important;
}

.error { color: var(--danger); margin-top: 10px; min-height: 18px; }
.hint { color: var(--muted); margin-top: 16px; }
.hint code { color: var(--accent); }