/* Sdílený světlý design systém pro veřejné vstupní stránky (domovská stránka,
   registrace restaurace/hosta, přihlášení) - vychází ze stejné vizuální
   podoby jako /test/ náhled nové rezervační stránky (restaurant-test.js). */

:root {
    --ub-bg: #f2f5f9;
    --ub-surface: #ffffff;
    --ub-input-bg: #f9fbfd;
    --ub-input-bg-alt: #f4f7fb;
    --ub-accent: #4da6ff;
    --ub-accent-hover: #2f8fe6;
    --ub-heading: #10233f;
    --ub-text: #1c2733;
    --ub-text-muted: #4a5a70;
    --ub-label: #93a2b7;
    --ub-border: #e6ebf2;
    --ub-border-soft: #eef2f7;
    --ub-danger: #e5484d;
    --ub-danger-soft: #ff6b6b;
    --ub-success: #2fb344;
    --ub-success-bg: #eefbf1;
    --ub-success-text: #14804a;
    --ub-error-bg: #fff1f1;
    --ub-error-text: #b3261e;
    --ub-disabled: #cbd5e1;

    --ub-radius-card: 20px;
    --ub-radius-input: 12px;
    --ub-radius-pill: 999px;

    --ub-shadow-card: 0 6px 24px rgba(30, 41, 59, 0.07);
    --ub-shadow-modal: 0 20px 60px rgba(16, 35, 63, 0.25);
    --ub-shadow-btn: 0 6px 16px rgba(77, 166, 255, 0.35);

    --ub-font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

.ub-card {
    background: var(--ub-surface);
    border-radius: var(--ub-radius-card);
    box-shadow: var(--ub-shadow-card);
    padding: 22px;
}

.ub-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--ub-radius-pill);
    padding: 11px 22px;
    font-weight: 600;
    font-size: 14px;
    font-family: var(--ub-font);
    cursor: pointer;
    background: var(--ub-accent);
    color: #fff;
    box-shadow: var(--ub-shadow-btn);
    text-decoration: none;
    transition: transform .1s ease, box-shadow .1s ease, background-color .1s ease;
}
.ub-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(77, 166, 255, 0.45); background: var(--ub-accent-hover); }
.ub-btn:disabled { background: var(--ub-disabled); color: #eef2f7; box-shadow: none; cursor: not-allowed; transform: none; }
.ub-btn.secondary { background: #fff; color: var(--ub-accent); border: 1.5px solid #dbeafe; box-shadow: none; }
.ub-btn.secondary:hover { background: #f5faff; }
.ub-btn.danger { background: var(--ub-danger-soft); box-shadow: 0 6px 16px rgba(255, 107, 107, 0.35); }
.ub-btn.small { padding: 7px 16px; font-size: 12.5px; }

.ub-label {
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--ub-label);
    margin-bottom: 8px;
    display: block;
}

.ub-input {
    width: 100%;
    box-sizing: border-box;
    background: var(--ub-input-bg);
    border: 1.5px solid var(--ub-border);
    border-radius: var(--ub-radius-input);
    padding: 11px 14px;
    font-size: 14px;
    font-family: var(--ub-font);
    color: var(--ub-text);
    outline: none;
    transition: border-color .1s ease;
}
.ub-input:focus { border-color: var(--ub-accent); }
.ub-input::placeholder { color: #adb8c4; }

.ub-chip {
    display: inline-block;
    padding: 6px 13px;
    border-radius: var(--ub-radius-pill);
    border: 1.5px solid var(--ub-border);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    color: var(--ub-text-muted);
    background: #fff;
}
.ub-chip:hover { border-color: #cfe0f5; }
.ub-chip.checked { background: var(--ub-accent); border-color: var(--ub-accent); color: #fff; }