/* ========== Light Theme Base ========== */
:root{
  --bg:#f7f9fc;
  --panel:#ffffff;
  --border:#e3e8ef;
  --muted:#5b6b88;
  --accent:#1a73e8;
  --text:#0f172a;
  --danger:#d93025;
  --success:#137333;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,Segoe UI,Arial;background:var(--bg);color:var(--text)}

/* ========== Layout: Sidebar + Main (Grid) ========== */
.layout{
  display:grid;
  grid-template-columns: 280px 1fr;   /* sidebar | main */
  min-height:100vh;
}

/* When collapsed, make sidebar narrower */
.layout--collapsed{
  grid-template-columns: 76px 1fr;
}

/* Main column holds content + sticky footer at bottom */
.main{
  display:flex;
  flex-direction:column;
  min-height:100vh;
}
.content{padding:24px}
.footer{
  margin-top:auto;
  padding:16px 24px;
  border-top:1px solid var(--border);
  background:var(--panel);
  color:var(--muted);
}

/* ========== Sidebar 2.0 ========== */
.sidebar{
  background:var(--panel);
  border-right:1px solid var(--border);
  padding:12px;
  position:sticky; top:0; height:100vh; overflow:auto;
  transition:width .18s ease;
}

/* header row with brand and collapse button */
.sidebar-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  background:var(--accent);color:#fff;display:grid;place-items:center;
  font-weight:800;letter-spacing:.5px
}
.brand-text{font-weight:800;font-size:1.05rem;white-space:nowrap}
.sidebar-collapse{
  appearance:none;border:1px solid var(--border);background:#fff;
  width:34px;height:34px;border-radius:10px;cursor:pointer;display:grid;place-items:center;
  color:var(--muted)
}

/* user box */
.userbox{
  display:flex;align-items:center;gap:10px;
  padding:10px;border:1px solid var(--border);border-radius:12px;background:#fff;margin-bottom:12px
}
.avatar{
  width:36px;height:36px;border-radius:50%;
  background:#eef3ff;color:var(--accent);display:grid;place-items:center;font-weight:700
}
.user-meta .username{font-weight:600}
.user-meta .role{font-size:.85rem;color:var(--muted)}

/* nav list */
.menu{list-style:none;margin:0;padding:0}
.item{
  position:relative;
  display:flex;align-items:center;gap:10px;
  padding:10px 12px;border-radius:10px;border:1px solid var(--border);
  background:#fff;color:var(--text)
}
.item:hover{background:#f7fbff;border-color:#d6e6ff}
.item.active{border-color:var(--accent);box-shadow:0 0 0 2px rgba(26,115,232,.08) inset}
.item .icon{width:20px;display:grid;place-items:center;color:#5a6aa0}
.item .text{white-space:nowrap}

/* submenu / accordion */
.has-sub{margin-top:8px}
.submenu-toggle{width:100%;text-align:left;cursor:pointer}
.submenu-toggle .chev{margin-left:auto;color:var(--muted);transition:transform .15s}
.has-sub.open .submenu-toggle .chev{transform:rotate(180deg)}
.submenu{display:none;list-style:none;margin:6px 0 6px 0;padding-left:12px}
.has-sub.open .submenu{display:block}
.submenu .item{background:#fff}
.submenu .dot{width:6px;height:6px;border-radius:6px;background:var(--accent);display:inline-block;margin-right:6px}

/* collapsed (visual only; column width handled by .layout--collapsed) */
.sidebar.collapsed .brand-text,
.sidebar.collapsed .user-meta,
.sidebar.collapsed .item .text{display:none}
.sidebar.collapsed .brand{justify-content:center}
.sidebar.collapsed .userbox{justify-content:center}
.sidebar.collapsed .item{justify-content:center}
.sidebar.collapsed .submenu-toggle .chev{display:none}

/* === SHOW submenu professionally on hover when sidebar is collapsed === */
.sidebar.collapsed .has-sub:hover > .submenu {
  display: block !important;
  position: absolute;
  left: 100%;
  top: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: 0 6px 20px rgba(0,0,0,.1);
  border-radius: 8px;
  padding: 8px 0;
  min-width: 200px;
  z-index: 9999;
}

.sidebar.collapsed .has-sub:hover > .submenu .item {
  padding: 10px 16px;
  white-space: nowrap;
}

.sidebar.collapsed .submenu .dot {
  display: none;
}


/* simple hover labels when collapsed */
.sidebar.collapsed .item::after{
  content: attr(data-label);
  position:absolute; left:calc(100% + 8px); top:50%; transform:translateY(-50%);
  background:#fff;border:1px solid var(--border);border-radius:8px;padding:6px 8px;
  white-space:nowrap;color:var(--text);box-shadow:0 6px 20px rgba(0,0,0,.08);
  opacity:0;pointer-events:none;transition:opacity .12s
}
.sidebar.collapsed .item:hover::after{opacity:1}

/* ========== Forms / Tables / Buttons / Alerts ========== */
a{color:var(--accent);text-decoration:none}
.card{background:var(--panel);border:1px solid var(--border);padding:16px;border-radius:12px;max-width:520px}
label{display:block;margin-bottom:12px;font-size:.95rem}
input,select{
  width:100%;padding:10px;border-radius:10px;border:1px solid var(--border);background:#fff;color:var(--text)
}
.btn{background:var(--accent);color:#fff;padding:10px 14px;border:none;border-radius:10px;cursor:pointer;font-weight:600}
.btn.small{padding:6px 10px;font-size:.85rem}
.btn.danger{background:var(--danger)}
.alert{padding:10px 12px;border-radius:10px;margin:12px 0}
.alert.success{background:#e6f4ea;border:1px solid #c8e6c9;color:var(--success)}
.alert.error{background:#fce8e6;border:1px solid #f3c7c3;color:var(--danger)}
.table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.table th,.table td{padding:10px;border-bottom:1px solid var(--border);text-align:left}
.inline{display:inline-block;margin-right:6px}

/* ========== Toasts ========== */
#toast-container{position:fixed;top:16px;right:16px;z-index:9999;display:flex;flex-direction:column;gap:10px}
.toast{background:var(--panel);border:1px solid var(--border);border-left-width:4px;padding:10px 12px;border-radius:10px;min-width:240px;box-shadow:0 4px 14px rgba(0,0,0,.08)}
.toast.success{border-left-color:var(--success)}
.toast.error{border-left-color:var(--danger)}

/* ========== Mobile (≤900px): off-canvas sidebar ========== */
.nav-toggle{display:none}
@media (max-width:900px){
  .layout{display:block}              /* stack */
  .sidebar{
    position:fixed;left:0;top:0;height:100vh;width:260px;
    transform:translateX(-100%);transition:transform .2s ease;z-index:999;background:var(--panel)
  }
  .sidebar.open{transform:translateX(0)}
  .nav-toggle{display:inline-block;margin:10px 12px}
  .content{padding-top:64px}
}
.nav-toggle {
  display: none;
  font-size: 24px;
  padding: 8px 12px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  transition: background 0.2s, box-shadow 0.2s;
}

.nav-toggle:hover {
  background: #f2f6fc;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-block;
    margin: 12px 16px;
  }
}
@media (max-width: 900px) {
  .nav-toggle {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 100;
  }
}