:root{
  /* NEW: svetlé UI, tmavé menu */
  --bg:#f3f6fa;              /* pozadí aplikace */
  --card:#ffffff;            /* karty / pracovní plocha */
  --text:#111827;            /* hlavní text */
  --muted:#6b7280;           /* méne duležitý text */
  --acc:#1f5fa6;             /* modrá tlacítek/akcent */
  --danger:#dc2626;
  --ok:#16a34a;

  /* NEW: stíny */
  --shadow-sm: 0 2px 10px rgba(17, 24, 39, .08);
  --shadow-md: 0 10px 30px rgba(17, 24, 39, .12);

  /* NEW: menu bar */
  --nav-bg:#0f2a44;
  --nav-border: rgba(255,255,255,.14);

  /* CHAT */  
  --chat-accent: #0f2a44;           /* tmave modra */
  --chat-accent-2: #0f4a64;
  --chat-bg: #ffffff;
  --chat-text: #111;
  --chat-muted: #777;
  --chat-shadow: 0 8px 24px rgba(0,0,0,.18);
  --chat-radius: 16px;
}

*{ box-sizing:border-box; }

html,body{
  margin:0;
  padding:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
}

input,button {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

a{ color:var(--acc); text-decoration:none; }

.container{ max-width:1100px; margin:0 auto; padding:16px; }

/* ===== NAV (topbar) ===== */
.nav{
  display:flex;
  gap:12px;
  align-items:center;
  flex-wrap:wrap;
  padding:12px 16px;
  background:var(--nav-bg);
  position:sticky;
  top:0;
  z-index:10;
  border-bottom:1px solid var(--nav-border);
  box-shadow: 0 6px 18px rgba(0,0,0,.18);
}

/* odkazy v menu: bílé */
.nav a{
  padding:8px 10px;
  border-radius:10px;
  color:#fff;
  opacity:.92;
}
.nav a:hover{
  background:rgba(255,255,255,.10);
  opacity:1;
}

.nav .spacer{ flex:1; }

/* NEW: hamburger tlacítko */
.nav .nav-toggle{
  display:none;
  margin-left:auto;
  border:1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.08);
  color:#fff;
  border-radius:10px;
  padding:8px 10px;
  cursor:pointer;
}
.nav .nav-toggle:hover{
  background: rgba(255,255,255,.12);
}

/* NEW: obal odkazu (kvuli mobilnímu dropdownu) */
.nav .nav-links{
  display:flex;
  gap:12px;
  align-items:center;
  flex-wrap:wrap;
}

.nav .nav-logo{
  font-weight:600;
  letter-spacing:.4px;
  white-space:nowrap;
}

/* ===== CARDS / WORK AREA ===== */
.card{
  background:var(--card);
  border:1px solid rgba(17, 24, 39, .08);
  border-radius:18px;
  padding:16px;
  box-shadow: var(--shadow-sm);
}
.card:hover{
  box-shadow: var(--shadow-md);
}

.dialog {           /* Mensi card uprostred */
  max-width: 600px;
  margin: 0 auto;
}

.grid{ display:grid; gap:14px; }
.grid.two{ grid-template-columns: 1fr 1fr; margin-bottom: 14px; }
@media (max-width: 820px){ .grid.two{ grid-template-columns: 1fr; } }

h1{ font-size:22px; margin:0 0 10px; }
h2{ font-size:18px; margin:0 0 10px; color:var(--muted); font-weight:600; }

label{ font-size:13px; color:var(--muted); display:block; margin:10px 0 6px; }

/* ===== INPUTS ===== */
input,select,textarea{
  width:100%;
  padding:11px 12px;
  border-radius:12px;
  border:1px solid rgba(17, 24, 39, .14);
  background:#fff;
  color:var(--text);
  outline:none;
  box-shadow: 0 1px 0 rgba(17,24,39,.04);
}
input:focus,select:focus,textarea:focus{
  border-color: rgba(31,95,166,.55);
  box-shadow: 0 0 0 3px rgba(31,95,166,.14);
}
textarea{ min-height:90px; resize:vertical; }

.row{ display:flex; gap:12px; }
@media (max-width: 640px){ .row{ flex-direction:column; } }

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(17, 24, 39, .14);
  background:#fff;
  color:var(--text);
  cursor:pointer;
  box-shadow: var(--shadow-sm);
  font-size: 11pt;          /* DMA added */
}
.btn:hover{
  background: #f5f7fb;
}

/* modrá s bílým textem */
.btn.primary{
  background:var(--acc);
  border-color: transparent;
  color:#fff;
  font-weight:700;
}
.btn.primary:hover{ filter:brightness(1.05); }

.btn.danger{
  /*background:transparent;*/
  background:var(--danger);
  border-color: rgba(220,38,38,.45);
  /*color: #b91c1c;*/
  color:#fff;
}
.btn.danger:hover{
  /*background: rgba(220,38,38,.08);*/
  filter:brightness(1.05);
}

.badge{
  display:inline-block;
  padding:4px 8px;
  border-radius:999px;
  font-size:12px;
  border:1px solid rgba(17, 24, 39, .14);
  color:var(--muted);
  background:#fff;
}

.table{ width:100%; border-collapse:collapse; }
.table th,.table td{
  text-align:left;
  padding:10px 8px;
  border-bottom:1px solid rgba(17, 24, 39, .08);
  vertical-align:top;
}
.table th{ color:var(--muted); font-weight:600; font-size:13px; }

.table tbody tr td .btn { height: 20px; font-size: 14px; }      /* DMA - pro stejnou velikost tlacitek v gridu */

.flash{
  margin:12px 0;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid rgba(17, 24, 39, .12);
  background:#fff;
  box-shadow: var(--shadow-sm);
}
.flash.ok{ border-color: rgba(22,163,74,.35); }
.flash.err {
    border-color: rgba(220, 38, 38, .85);
    border-width: 2px;
}

.sig-box{
  background:#fff;
  border:1px dashed rgba(17, 24, 39, .25);
  border-radius:14px;
  padding:10px;
  box-shadow: var(--shadow-sm);
}

canvas{
  width:100%;
  height:160px;
  border-radius:10px;
  touch-action:none;
  background:white;
  border:1px solid rgba(17, 24, 39, .35);       /* DMA added */
  max-width: 500px;                             /* DMA added */
}

.small{ color:var(--muted); font-size:10pt; }

.mt8 { margin-top: 8px; }
.mt12 { margin-top: 12px; }
.mt16 { margin-top: 16px; }
.mt24 { margin-top: 24px; }

/* ===== MOBILE NAV DROPDOWN ===== */
@media (max-width: 768px){
  .nav{
    flex-wrap:nowrap;
  }

  .nav .nav-toggle{
    display:inline-flex;
    align-items:center;
    justify-content:center;
  }

  /* schovat odkazy, dokud není menu otevrené */
  .nav .nav-links{
    display:none;
    position:absolute;
    left:0;
    right:0;
    top:56px;
    background:var(--nav-bg);
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px 10px 10px;
    border-bottom:1px solid var(--nav-border);
    box-shadow: 0 16px 32px rgba(0,0,0,.20);
  }

  .nav .nav-links a{
    padding:12px 12px;
    border-radius:12px;
  }

  .nav.open .nav-links{
    display:flex;
  }
}

/*************** Modal dialog *************/
.modal-centered-div {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
  z-index: 5000;
}

.modal-centered-div .modal-content {
  background: white;
  padding: 20px;
  border-radius: 8px;
  width: 90%;
  max-width: 470px;
  border: 2px solid darkred;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
}

.modal-title {
  background: darkred;
  color: white;
  padding: 10px;
  margin: -20px -20px 20px -20px;
  text-align: center;
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  font-size: .9rem;
  font-weight: 700;
}

@media (min-width: 768px) {
  .modal-centered-div .modal-content {
    width: 70%;
  }
}

.modal-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.modal-buttons button {
  padding: 8px 18px;
  font-size: 15px;
  cursor: pointer;
  width: 80px;
}

/************  CHAT  *************/
/* FAB tlacítko */
#ai-chat-launcher{
  position: fixed; right: 20px; bottom: 20px;
  width: 56px; height: 56px; border-radius: 50%;
  display:flex; align-items:center; justify-content:center;
  background: var(--chat-accent); color: #fff; font-size: 22px;
  box-shadow: var(--chat-shadow); cursor: pointer; user-select:none;
  transition: transform .12s ease, box-shadow .12s ease, background .2s;
  z-index: 500;
}
#ai-chat-launcher:hover{ transform: translateY(-1px); background: var(--chat-accent-2); }

/* Panel */
#ai-chat-panel{
  position: fixed; right: 20px; bottom: 86px; width: 360px; max-width: calc(100vw - 32px);
  height: 520px; display:flex; flex-direction:column; background: var(--chat-bg);
  border-radius: var(--chat-radius); box-shadow: var(--chat-shadow); overflow: hidden; z-index: 9999;
  border: 1px solid #eee;
}
#ai-chat-panel header{
  background: linear-gradient(0deg, var(--chat-accent), var(--chat-accent-2));
  color: #fff; padding: 10px 12px; display:flex; align-items:center; justify-content:space-between;
}
#ai-chat-close{
  background: transparent; border: 0; color: #fff; font-size: 18px; cursor:pointer;
}
#ai-chat-log{ flex: 1; padding: 12px; overflow-y:auto; background:#fafafa; }
#ai-chat-log .msg{ display:flex; margin: 8px 0; gap: 8px; }
#ai-chat-log .msg .bubble{
  max-width: 80%; padding: 10px 12px; border-radius: 14px; line-height: 1.35; font-size: 14px;
  box-shadow: 0 1px 2px rgba(0,0,0,.06);
  white-space: pre-wrap; word-wrap: break-word;
}
#ai-chat-log .user .bubble{ margin-left:auto; background:#e8f0ff; border-top-right-radius: 4px; }
#ai-chat-log .bot .bubble{ margin-right:auto; background:#fff; border-top-left-radius: 4px; }
#ai-chat-log .system{ text-align:center; color: var(--chat-muted); font-size:12px; }

#ai-chat-form{ display:flex; gap:8px; padding: 10px; border-top: 1px solid #eee; background:#fff; }
#ai-chat-input{
  flex:1; padding: 10px 12px; border-radius: 10px; border:1px solid #ddd; font-size:14px;
}
#ai-chat-send{
  padding: 10px 14px; border-radius: 10px; border:0; cursor:pointer; color:#fff; background: var(--chat-accent);
}
#ai-chat-send:disabled{ opacity:.6; cursor:not-allowed; }

[hidden]{ display:none !important; }        /* Atribut (AI) */

/* Mobile max height */
@media (max-height: 640px){
  #ai-chat-panel{ height: 70vh; }
}