/* --- StudyZone UI v5.2 — Sidebar position fix (mobile) --- */
:root{
  --turq:#00D1D1; --navy:#0B1B2B; --white:#FFFFFF;
  --bg: var(--white); --ink: var(--navy); --muted:#4a6077;
  --brd: rgba(11,27,43,.12); --panel: rgba(11,27,43,.04); --panel-2: rgba(11,27,43,.06);
  --glass: rgba(11,27,43,.06); --r-lg:20px; --shadow-1:0 10px 30px rgba(11,27,43,.12);
}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,Arial;color:var(--ink);background:var(--bg)}
.app{display:grid;grid-template-columns:280px 1fr;min-height:100vh;direction:ltr}
.sidebar,.content{direction:rtl}
.sidebar{
  background:var(--panel);
  backdrop-filter:blur(10px);
  border-inline-end:1px solid var(--brd);
  padding:18px;
  position:sticky; top:0; height:100vh;
}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;font-weight:800}
.brand img{width:40px;height:40px;border-radius:12px;object-fit:contain;background:rgba(11,27,43,.06)}
.brand .txt{display:flex;flex-direction:column;line-height:1}
.brand .txt b{font-size:18px}.brand .txt span{font-size:11px;color:var(--muted)}
.nav{display:flex;flex-direction:column;gap:6px;margin:10px 0 12px}
.nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;color:var(--ink);text-decoration:none;border:1px solid transparent}
.nav a:hover{background:var(--glass);border-color:var(--brd)}
.nav a.active{background:linear-gradient(135deg, rgba(0,209,209,.14), rgba(11,27,43,.10))}
.user-card{margin-top:auto;padding:10px 12px;border:1px solid var(--brd);border-radius:14px;background:rgba(11,27,43,.04)}
.header{display:flex;align-items:center;justify-content:space-between;padding:14px 0 8px;position:sticky;top:0;z-index:3;background:#fff;border-bottom:1px solid rgba(11,27,43,.06)}
.hamburger{display:none;appearance:none;background:var(--panel);border:1px solid var(--brd);border-radius:10px;padding:8px 10px;cursor:pointer}
.content{padding:20px 22px}
.card{background:var(--panel-2);border:1px solid var(--brd);border-radius:var(--r-lg);box-shadow:var(--shadow-1);padding:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--turq);color:#002029;padding:11px 16px;border-radius:14px;border:0;cursor:pointer;font-weight:700;box-shadow:0 10px 24px rgba(0,209,209,.25)}
.btn.secondary{background:transparent;color:var(--ink);border:1px solid var(--brd);box-shadow:none}
.btn:active{transform:translateY(1px)}
label{display:flex;flex-direction:column;gap:6px;margin:8px 0}
input,select,textarea{border:1px solid var(--brd);background:#fff;color:var(--ink);padding:12px;border-radius:12px;outline:0}
input::placeholder,textarea::placeholder{color:#789}
input:focus,select:focus,textarea:focus{border-color:var(--turq);box-shadow:0 0 0 4px rgba(0,209,209,.18)}
select{background-image:none}
.table{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid var(--brd);border-radius:16px;overflow:hidden}
.table thead th{background:#f7fbfc;text-align:right;font-weight:700}
.table th,.table td{padding:12px 14px;border-bottom:1px solid var(--brd)}
.table tbody tr:hover{background:#fafafa}

/* AUTH MODE */
.auth-only .sidebar,.auth-only .header{display:none}
.auth-only .content{padding:0}
.auth-page{min-height:100vh;display:grid;place-items:center;background:#fff}
.auth-card{width:min(440px,92vw);background:rgba(255,255,255,.84);border:1px solid rgba(11,27,43,.08);border-radius:22px;box-shadow:0 20px 50px rgba(11,27,43,.08);padding:22px 20px;backdrop-filter:blur(8px)}
.auth-brand{display:flex;flex-direction:column;align-items:center;gap:10px;margin-bottom:10px}
.auth-brand img{width:72px;height:72px;border-radius:16px;background:#f0f7f7}
.auth-brand h1{margin:0;font-size:20px;color:var(--ink)}
.auth-copy{text-align:center;color:var(--muted);font-size:13px;line-height:1.6}
.footer-note{opacity:.6;font-size:12px;margin-top:14px;text-align:center;color:var(--muted)}

/* MOBILE SIDEBAR — FORCE LEFT ANCHOR */
@media (max-width:1000px){
  .app{grid-template-columns:1fr}
  .sidebar{
    position:fixed;
    left:0; right:auto; top:0; bottom:0;
    width:280px;
    transform:translateX(-100%);
    transition:transform .25s ease;
    background:#f6f9f9;
    box-shadow:8px 0 24px rgba(11,27,43,.12);
    z-index:1001;
    padding:18px;
  }
  body[data-sidebar="open"] .sidebar{ transform:translateX(0) }
  .hamburger{display:inline-flex}
}