:root{
    --bg:#0b1020;
    --panel:#121933;
    --accent:#4f7cff;
    --text:#e9eefc;
    --muted:#9fb0e6;
    --border:#233056;
    --white:#ffffff;
  }
  
  *{box-sizing:border-box}
  html,body{height:100%}
  body{
    margin:0; font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial,sans-serif;
    background:var(--bg); color:var(--text);
  }
  
  /* ===== Layout global (plus de sidebar) ===== */
  .app{
    display:grid;
    grid-template-rows:72px 1fr;
    min-height:100vh;
  }
  
  /* ===== Header top / nav ===== */
  .header{
    position:sticky; top:0; z-index:50;
    background:linear-gradient(180deg,#151f40,#111a35);
    border-bottom:1px solid var(--border);
    display:flex; align-items:center; gap:20px;
    padding:0 20px; height:72px;
    box-shadow:0 10px 20px rgba(0,0,0,.2);
  }
  .brand{
    display:flex; align-items:center; gap:12px; min-width:180px;
    font-weight:800; letter-spacing:.2px;
  }
  .logo{
    width:34px; height:34px; border-radius:10px;
    background:linear-gradient(135deg, var(--accent), #8aa7ff);
    box-shadow:0 6px 16px rgba(79,124,255,.35);
  }
  
  /* Navigation horizontale */
  .topnav{
    display:flex; align-items:center; gap:14px; flex:1;
  }
  .nav-list{
    display:flex; align-items:center; gap:6px; list-style:none; margin:0; padding:0;
  }
  .nav-item{ position:relative; display:flex; flex-direction:column; }
  .nav-link{
    display:inline-flex; align-items:center; gap:8px;
    padding:10px 12px; border-radius:10px; text-decoration:none;
    color:var(--text);
  }
  .nav-link:hover{ background:rgba(255,255,255,.06) }
  .nav-link.active{ background:rgba(79,124,255,.18); border:1px solid #395ac0 }

  /* Dropdown */
  .dropdown-menu{
    position:absolute; left:0; top:100%; min-width:240px; display:none;
    background:var(--panel); border:1px solid var(--border);
    border-radius:12px; padding:8px; margin-top:8px;
    box-shadow:0 12px 28px rgba(0,0,0,.35);
    flex-direction:column; gap:4px;
    z-index:100;
  }
  .nav-item.dropdown:hover > .dropdown-menu,
  .nav-item.dropdown:focus-within > .dropdown-menu,
  .nav-item.dropdown.open > .dropdown-menu{
    display:flex;
  }
  .dropdown-menu a{
    text-decoration:none; color:var(--text);
    padding:10px 10px; border-radius:8px; display:flex; justify-content:space-between;
  }
  .dropdown-menu a:hover{ background:rgba(255,255,255,.06) }
  .dropdown-menu a.active{ background:rgba(79,124,255,.18); border:1px solid #395ac0 }
  
  /* Actions à droite */
  .actions{
    display:flex; align-items:center; gap:10px;
  }
  .lang{
    font-size:13px; color:var(--muted); opacity:.9;
    padding:8px 10px; border-radius:10px; border:1px solid var(--border);
  }
  .btn{
    display:inline-flex; align-items:center; gap:8px;
    padding:10px 14px; border-radius:12px; text-decoration:none; font-weight:700;
    border:1px solid var(--border); background:rgba(255,255,255,.06); color:var(--white);
  }
  .btn:hover{ border-color:#395ac0; background:rgba(79,124,255,.18) }
  .btn.primary{ background:var(--accent); border-color:#2f53d0; color:white }
  
  /* ===== Main / iframe ===== */
  .main{ padding:16px 20px; }
  .card{
    background:var(--panel); border:1px solid var(--border);
    border-radius:16px; padding:12px; display:flex; flex-direction:column; gap:12px;
    min-height:0;
  }
  .card-header{ display:flex; justify-content:space-between; align-items:center; gap:10px; }
  .card-title{ font-size:18px; font-weight:800 }

  .card-body{ display:flex; flex-direction:column; gap:16px; }
  .info-text{ color:var(--muted); font-size:14px; }

  .form{ display:flex; flex-direction:column; gap:16px; }
  .form-row{ display:flex; flex-direction:column; gap:6px; }
  .form-row label{ font-weight:600; }
  .form-row input[type="file"]::-webkit-file-upload-button{
    background:var(--accent); border:none; color:var(--white);
    padding:8px 12px; border-radius:8px; cursor:pointer; margin-right:10px;
  }
  .form-row input[type="file"],
  .form-row select,
  .form-row input[type="number"]{
    padding:8px 12px; border-radius:8px; border:1px solid var(--border);
    background:rgba(255,255,255,.06); color:var(--text);
  }

  /* Ensure dropdown options remain readable on dark background */
  .form-row select option{
    background:var(--panel);
    color:var(--text);
  }
  .form-row input:disabled,
  .form-row select:disabled{ opacity:.5; }
  .form button[type="submit"]{
    align-self:flex-start; background:var(--accent); border:1px solid #2f53d0;
    color:var(--white); padding:10px 16px; border-radius:8px; font-weight:700; cursor:pointer;
  }
  .form button[type="submit"]:hover{ background:#395ac0; }

  .chart-container{
    margin-top:1rem;
    background:rgba(255,255,255,.06);
    padding:1rem;
    border-radius:8px;
  }
  #forecast-table{
    margin-top:1rem; width:100%; text-align:center; border-collapse:collapse;
    background:rgba(255,255,255,.06);
  }
  #forecast-table th, #forecast-table td{
    padding:8px 12px; border:1px solid var(--border);
  }
  #forecast-table tbody tr:nth-child(even){
    background:rgba(255,255,255,.03);
  }
  
  .iframe-wrap{
    position:relative; flex:1 1 auto; min-height:72vh;
    border-radius:12px; overflow:hidden; border:1px solid var(--border);
  }
  .iframe-wrap iframe{ position:absolute; inset:0; width:100%; height:100%; border:0 }
  
  /* ===== Responsive / burger ===== */
  .burger{
    display:none; width:44px; height:44px; border:1px solid var(--border);
    border-radius:12px; align-items:center; justify-content:center; background:transparent; color:var(--text);
  }
  .burger span{ width:20px; height:2px; background:var(--text); position:relative; display:block }
  .burger span::before, .burger span::after{
    content:""; position:absolute; left:0; right:0; height:2px; background:var(--text);
  }
  .burger span::before{ top:-6px } .burger span::after{ top:6px }
  
  @media (max-width: 1024px){
    .nav-list{ display:none; position:absolute; left:0; right:0; top:72px;
      background:var(--panel); padding:10px; border-bottom:1px solid var(--border) }
    .nav-list.open{ display:flex; flex-direction:column; align-items:flex-start; gap:4px }
    .dropdown-menu{ display:none; position:static; opacity:1; transform:none; pointer-events:auto; box-shadow:none; border:none; padding:0; background:transparent }
    .nav-item.dropdown.open > .dropdown-menu{ display:flex }
    .burger{ display:flex }
  }