* { box-sizing: border-box; }

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    background: #f6f7f9;
    color: #1f2937;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: #1f2937;
    color: #fff;
}
header h1 { margin: 0; font-size: 18px; font-weight: 600; }
header a { color: #fff; text-decoration: none; font-size: 14px; }
header a:hover { text-decoration: underline; }

main {
    max-width: 1200px;
    margin: 24px auto;
    padding: 0 16px;
}

#calendar {
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}

.login {
    display: grid;
    place-items: center;
    min-height: 100vh;
    background: #1f2937;
}
.login form {
    background: #fff;
    padding: 28px;
    border-radius: 10px;
    min-width: 320px;
    display: grid;
    gap: 14px;
    box-shadow: 0 8px 24px rgba(0,0,0,.2);
}
.login h1 { margin: 0; font-size: 20px; text-align: center; }
.login label { display: grid; gap: 6px; font-size: 13px; color: #4b5563; }
.login input {
    padding: 10px 12px;
    font-size: 15px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    width: 100%;
}
.login button {
    padding: 10px;
    font-size: 15px;
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.login button:hover { background: #1d4ed8; }

dialog {
    border: none;
    border-radius: 10px;
    padding: 0;
    box-shadow: 0 10px 40px rgba(0,0,0,.25);
}
dialog::backdrop { background: rgba(0,0,0,.45); }

dialog form,
dialog .card {
    padding: 22px;
    min-width: 360px;
    display: grid;
    gap: 12px;
}
dialog h2 { margin: 0 0 4px; font-size: 18px; }
dialog label {
    display: grid;
    gap: 4px;
    font-size: 13px;
    color: #4b5563;
}
dialog input {
    padding: 8px 10px;
    font-size: 14px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
}
dialog input:focus {
    outline: 2px solid #2563eb;
    outline-offset: -1px;
    border-color: #2563eb;
}

.actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 8px;
}

button {
    cursor: pointer;
    padding: 8px 14px;
    font-size: 14px;
    border: 1px solid #d1d5db;
    background: #fff;
    border-radius: 6px;
}
button:hover { background: #f3f4f6; }
button.primary {
    background: #2563eb;
    color: #fff;
    border-color: #2563eb;
}
button.primary:hover { background: #1d4ed8; }
button.danger {
    background: #dc2626;
    color: #fff;
    border-color: #dc2626;
}
button.danger:hover { background: #b91c1c; }

.err {
    color: #dc2626;
    font-size: 13px;
    margin: 0;
    min-height: 1em;
}