:root {
    --sidebar-bg: #1b2942;
    --sidebar-bg-active: #26385a;
    --sidebar-text: #aebbd0;
    --sidebar-text-active: #ffffff;
    --accent: #4fb8ae;
    --accent-hover: #3fa298;
    --color-bg: #eef1f5;
    --color-surface: #ffffff;
    --color-border: #dfe3e8;
    --color-text: #1f2933;
    --color-muted: #6b7280;
    --color-error: #b91c1c;
    --radius: 8px;
    --sidebar-width: 220px;
}

* { box-sizing: border-box; }

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

/* --- Přihlašovací obrazovka (bez menu) --- */
.content--center {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* --- Layout s postranním panelem --- */
.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    padding: 16px 0;
}

.sidebar__brand {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px 20px;
    color: #fff;
    font-size: 1.05rem;
    letter-spacing: 0.02em;
}

.sidebar__logo { color: var(--accent); font-size: 1.2rem; }

.sidebar__nav {
    display: flex;
    flex-direction: column;
}

.nav-item {
    display: block;
    padding: 10px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.92rem;
    border-left: 3px solid transparent;
    cursor: pointer;
}

.nav-item:hover:not(.nav-item--disabled) {
    background: var(--sidebar-bg-active);
    color: var(--sidebar-text-active);
}

.nav-item--active {
    background: var(--sidebar-bg-active);
    color: var(--sidebar-text-active);
    border-left-color: var(--accent);
    font-weight: 600;
}

.nav-item--disabled {
    color: #5c6b85;
    cursor: not-allowed;
}

.nav-sub {
    display: flex;
    flex-direction: column;
    padding: 4px 0 8px;
}

.nav-sub__item {
    padding: 6px 20px 6px 36px;
    font-size: 0.86rem;
    color: var(--sidebar-text);
    text-decoration: none;
}

.nav-sub__item:hover:not(.nav-sub__item--disabled) {
    color: var(--sidebar-text-active);
}

.nav-sub__item--active { color: var(--accent); font-weight: 600; }
.nav-sub__item--disabled { color: #5c6b85; cursor: not-allowed; }

/* --- Hlavní obsah --- */
.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 24px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.topbar__search {
    flex: 1;
    max-width: 320px;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.topbar__right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar__user { color: var(--color-text); font-size: 0.92rem; }

.topbar__logout button {
    background: none;
    border: none;
    color: var(--color-muted);
    cursor: pointer;
    font-size: 0.9rem;
}

.content {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 16px;
}

/* --- Karty a formuláře --- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.card--narrow { max-width: 420px; }

.card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 1px solid var(--color-border);
}

.table a { color: var(--accent); text-decoration: none; }
.table a:hover { text-decoration: underline; }

.details {
    display: grid;
    grid-template-columns: 160px 1fr;
    row-gap: 8px;
}

.details dt { color: var(--color-muted); }
.details dd { margin: 0; }

.form {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form label { margin-top: 12px; font-size: 0.85rem; color: var(--color-muted); }

.form input, .form textarea {
    padding: 8px 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
}

.button, button[type="submit"] {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    font-size: 0.92rem;
    margin-top: 16px;
}

.button:hover, button[type="submit"]:hover { background: var(--accent-hover); }

.alert { padding: 10px 12px; border-radius: var(--radius); }
.alert--error { background: #fef2f2; color: var(--color-error); border: 1px solid #fecaca; }