/* ============================================================
   STEMath Academy — app.css v4.0
   ============================================================ */
:root{
  --co:#1A3A6B; --re:#C1272D; --gr:#006233; --go:#B8922A;
  --bg:#f3f5f9; --white:#fff; --border:#e8ecf2;
  --text:#1a1f36; --muted:#6b7a99;
  --sw:240px; --th:60px;
  --r:10px; --sh:0 2px 12px rgba(26,58,107,.08);
  --font:system-ui,'Segoe UI',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);font-size:14px;color:var(--text)}

/* ── App shell ──────────────────────────────────────────────────────────── */
.sta-app{display:flex;min-height:100vh;background:var(--bg)}

/* ── Sidebar ────────────────────────────────────────────────────────────── */
.sta-sidebar{width:var(--sw);min-height:100vh;background:var(--co);display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:0;overflow-y:auto}
.sta-brand{display:flex;align-items:center;gap:12px;padding:18px 14px 14px;border-bottom:1px solid rgba(255,255,255,.1)}
.sta-brand-logo{flex-shrink:0}
.sta-brand-name{color:#fff;font-weight:800;font-size:16px;line-height:1.2}
.sta-brand-sub{color:rgba(255,255,255,.5);font-size:11px}
.sta-sidebar-user{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid rgba(255,255,255,.08)}
.sta-avatar{width:36px;height:36px;border-radius:50%;background:var(--go);color:var(--co);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex-shrink:0}
.sta-avatar-sm{width:28px;height:28px;font-size:12px}
.sta-user-info{overflow:hidden}
.sta-user-name{color:#fff;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sta-user-role{color:rgba(255,255,255,.45);font-size:11px;text-transform:capitalize}
.sta-sidebar nav{padding:8px 0;flex:1}
.sta-nav{display:flex;align-items:center;gap:10px;width:100%;padding:10px 14px;background:none;border:none;cursor:pointer;color:rgba(255,255,255,.6);font-size:13px;font-family:var(--font);text-align:left;transition:all .15s}
.sta-nav:hover{background:rgba(255,255,255,.08);color:#fff}
.sta-nav.active{background:rgba(255,255,255,.13);color:#fff;font-weight:700;border-right:3px solid var(--go)}
.sta-nav-icon{font-size:16px;width:22px;text-align:center;flex-shrink:0}

/* ── Main ───────────────────────────────────────────────────────────────── */
.sta-main{flex:1;display:flex;flex-direction:column;min-width:0}
.sta-topbar{height:var(--th);background:var(--white);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:10;box-shadow:var(--sh)}
.sta-topbar-ttl{font-size:17px;font-weight:700;color:var(--co)}
.sta-topbar-r{display:flex;align-items:center;gap:14px}
.sta-topbar-user{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:500}
.sta-content{padding:24px;flex:1}
.sta-page-title{font-size:20px;font-weight:800;color:var(--co);margin-bottom:20px}
.sta-ph{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:10px}
.sta-ph-r{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

/* ── Stats ──────────────────────────────────────────────────────────────── */
.sta-stats-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:14px;margin-bottom:24px}
.sta-stat{background:var(--white);border-radius:var(--r);padding:18px 16px;border:1px solid var(--border);box-shadow:var(--sh);text-align:center}

/* ── Card ───────────────────────────────────────────────────────────────── */
.sta-card{background:var(--white);border-radius:var(--r);border:1px solid var(--border);padding:18px 20px;box-shadow:var(--sh)}
.sta-card-ttl{font-size:14px;font-weight:700;color:var(--co);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.sta-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.sta-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border:none;border-radius:7px;font-size:13px;font-weight:700;font-family:var(--font);cursor:pointer;transition:all .15s;line-height:1}
.sta-btn-primary{background:var(--co);color:#fff}
.sta-btn-primary:hover{background:#0f2550}
.sta-btn-secondary{background:#f0f3f9;color:var(--co)}
.sta-btn-secondary:hover{background:#e4e9f4}
.sta-btn-success{background:var(--gr);color:#fff}
.sta-btn-success:hover{background:#004d24}
.sta-btn-danger{background:var(--re);color:#fff}
.sta-btn-danger:hover{background:#a01f23}
.sta-sm{padding:5px 12px;font-size:12px;border-radius:5px}
.sta-btn:disabled{opacity:.5;cursor:not-allowed}

/* ── Forms ──────────────────────────────────────────────────────────────── */
.sta-fld{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}
.sta-fld label{font-size:11px;font-weight:700;color:#555;text-transform:uppercase;letter-spacing:.04em}
.sta-inp,.sta-sel,.sta-tex{padding:9px 12px;border:1.5px solid #dde3ed;border-radius:7px;font-size:13px;font-family:var(--font);color:var(--text);background:var(--white);width:100%;transition:border-color .15s}
.sta-inp:focus,.sta-sel:focus,.sta-tex:focus{outline:none;border-color:var(--co);box-shadow:0 0 0 3px rgba(26,58,107,.1)}
.sta-tex{resize:vertical}

/* ── Table ──────────────────────────────────────────────────────────────── */
.sta-tbl-wrap{overflow-x:auto;border-radius:var(--r);box-shadow:var(--sh)}
.sta-tbl{width:100%;border-collapse:collapse;background:var(--white);border-radius:var(--r);overflow:hidden;font-size:13px}
.sta-tbl thead tr{background:var(--co)}
.sta-tbl th{padding:11px 14px;text-align:left;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:rgba(255,255,255,.85)}
.sta-tbl td{padding:11px 14px;border-bottom:1px solid #f0f3f9}
.sta-tbl tbody tr:last-child td{border-bottom:none}
.sta-tbl tbody tr:hover{background:#f8faff}

/* ── Modal ──────────────────────────────────────────────────────────────── */
.sta-overlay{position:fixed;inset:0;background:rgba(10,20,50,.5);backdrop-filter:blur(3px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px}
.sta-modal{background:var(--white);border-radius:14px;width:100%;max-width:520px;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.sta-modal-w{max-width:760px}
.sta-modal-hd{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--border)}
.sta-modal-hd h3{font-size:16px;font-weight:700;color:var(--co)}
.sta-modal-x{background:none;border:none;cursor:pointer;font-size:20px;color:#999;line-height:1}
.sta-modal-x:hover{color:var(--re)}
.sta-modal-bd{padding:22px}
.sta-modal-ft{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}

/* ── Misc ───────────────────────────────────────────────────────────────── */
.sta-spin{width:36px;height:36px;margin:40px auto;border:3px solid var(--border);border-top-color:var(--co);border-radius:50%;animation:spin .7s linear infinite;display:block}
@keyframes spin{to{transform:rotate(360deg)}}
.sta-alert{background:#fee2e2;color:var(--re);padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:14px;font-weight:600}
.sta-user-cell{display:flex;align-items:center;gap:8px}
.sta-empty-state{text-align:center;padding:60px 20px;color:#bbb}
.sta-lvl{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11px;font-weight:700;color:#fff}
.sta-filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}

/* ── Level track ────────────────────────────────────────────────────────── */
.sta-lvl-track{display:flex;align-items:center;padding:8px 0;overflow-x:auto;gap:0}
.sta-lvl-step{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 14px;flex-shrink:0;opacity:.4;position:relative}
.sta-lvl-step.done,.sta-lvl-step.active{opacity:1}
.sta-lvl-step:not(:last-child)::after{content:'';position:absolute;right:0;top:50%;width:1px;height:20px;background:#dde3ed;transform:translateY(-50%)}
.sta-lvl-dot{width:22px;height:22px;border-radius:50%;background:#e8ecf2;transition:background .3s}
.sta-lvl-lbl{font-size:11px;color:var(--muted);white-space:nowrap}

/* ── Bell ───────────────────────────────────────────────────────────────── */
.sta-bell-wrap{position:relative}
.sta-bell{background:none;border:none;cursor:pointer;font-size:20px;padding:4px;position:relative;display:flex;align-items:center}
.sta-bell-dot{position:absolute;top:0;right:0;background:var(--re);color:#fff;border-radius:50%;width:18px;height:18px;font-size:10px;display:flex;align-items:center;justify-content:center;font-weight:700}
.sta-bell-panel{position:absolute;right:0;top:calc(100% + 8px);width:320px;background:var(--white);border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.15);border:1px solid var(--border);z-index:100;max-height:400px;overflow-y:auto}
.sta-bell-hd{display:flex;justify-content:space-between;align-items:center;padding:12px 14px;border-bottom:1px solid var(--border)}
.sta-bell-item{padding:10px 14px;border-bottom:1px solid #f5f7fa}
.sta-bell-item.unread{background:#f0f5ff}

/* ── Login ──────────────────────────────────────────────────────────────── */
.sta-login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#1A3A6B,#0f2550)}
.sta-login-box{background:var(--white);border-radius:16px;padding:40px 36px;width:100%;max-width:420px;box-shadow:0 24px 70px rgba(0,0,0,.3)}
.sta-login-logo{display:flex;justify-content:center;margin-bottom:20px}
.sta-login-title{font-size:22px;font-weight:800;color:var(--co);text-align:center;margin-bottom:4px}
.sta-login-sub{color:var(--muted);text-align:center;font-size:14px;margin-bottom:24px}

/* ── Challenge cards ────────────────────────────────────────────────────── */
.sta-ch-week{background:rgba(184,146,42,.15);color:var(--go);padding:2px 10px;border-radius:20px;font-size:11px;font-weight:700;display:inline-block;margin-bottom:6px}
.sta-ch-title{font-size:16px;font-weight:700;color:var(--co);margin-bottom:8px}

/* ══════════════════════════════════════════════════════════════════════════
   QUIZ MAKER
   ══════════════════════════════════════════════════════════════════════════ */
.qm-root{display:flex;flex-direction:column;height:100vh;background:var(--bg);font-family:var(--font)}
.qm-header{display:flex;align-items:center;justify-content:space-between;padding:12px 22px;background:var(--white);border-bottom:1px solid var(--border);box-shadow:var(--sh);flex-wrap:wrap;gap:10px}
.qm-back{background:none;border:none;cursor:pointer;color:var(--muted);font-size:14px;padding:6px 10px;border-radius:6px;font-family:var(--font)}
.qm-back:hover{background:#f0f3f9}
.qm-tabs{display:flex;background:var(--white);border-bottom:1px solid var(--border)}
.qm-tab{background:none;border:none;padding:11px 22px;font-size:13px;font-weight:600;color:#888;cursor:pointer;border-bottom:2px solid transparent;font-family:var(--font)}
.qm-tab.active{color:var(--co);border-bottom-color:var(--co)}
.qm-body{display:flex;flex:1;overflow:hidden}
.qm-left{width:280px;flex-shrink:0;background:var(--white);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow-y:auto}
.qm-right{flex:1;overflow-y:auto;padding:24px}
.qm-btn-pri{background:var(--co);color:#fff;border:none;padding:9px 20px;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;font-family:var(--font)}
.qm-btn-pri:hover{background:#0f2550}
.qm-btn-pri:disabled{opacity:.5;cursor:not-allowed}
.qm-btn-sec{background:#f0f3f9;color:var(--co);border:none;padding:9px 16px;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;font-family:var(--font)}
.qm-btn-sec:hover{background:#e4e9f4}

/* ══════════════════════════════════════════════════════════════════════════
   PAYMENT GATEWAY
   ══════════════════════════════════════════════════════════════════════════ */
.pg-modal{background:var(--white);border-radius:14px;width:100%;max-width:720px;max-height:92vh;overflow-y:auto;box-shadow:0 24px 70px rgba(0,0,0,.3);display:flex;flex-direction:column}

/* ══════════════════════════════════════════════════════════════════════════
   FULLSCREEN / WORDPRESS OVERRIDES
   ══════════════════════════════════════════════════════════════════════════ */
body.sta-fullscreen{margin:0!important;padding:0!important;overflow:hidden}
body.sta-fullscreen #wpadminbar{display:none!important}
body.sta-fullscreen html{margin-top:0!important}
#sta-root{min-height:100vh}
/* Fix WP admin panel layout */
.wrap>#sta-root{margin:-10px -20px}
/* Responsive */
@media(max-width:768px){
  :root{--sw:58px}
  .sta-brand-name,.sta-brand-sub,.sta-user-info,.sta-nav span:not(.sta-nav-icon){display:none}
  .sta-nav{justify-content:center;padding:12px 8px}
  .sta-stats-grid{grid-template-columns:1fr 1fr}
  .sta-card-grid{grid-template-columns:1fr}
  .qm-left{width:220px}
}