/* Moderní styl pro přihlášení a výběr období */
body {
    background: linear-gradient(135deg, #6a11cb, #2575fc);
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.container {
    background: #fff;
    padding: 40px 50px;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    width: 360px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

h1 {
    margin-bottom: 30px;
    font-size: 24px;
    font-weight: 700;
    color: #222;
}

label {
    display: block;
    text-align: left;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 14px;
    color: #555;
}

input[type="text"], input[type="date"] {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 20px;
    border-radius: 10px;
    border: 1px solid #ccc;
    font-size: 15px;
    box-sizing: border-box;
    transition: 0.3s;
}

input[type="text"]:focus, input[type="date"]:focus {
    outline: none;
    border-color: #2575fc;
    box-shadow: 0 0 8px rgba(37,117,252,0.4);
}

button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #2575fc, #6a11cb);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: linear-gradient(135deg, #6a11cb, #2575fc);
}

.error {
    color: #e74c3c;
    margin-bottom: 15px;
    font-weight: bold;
    font-size: 14px;
    text-align: left;
}

input::placeholder {
    color: #aaa;
    font-style: italic;
}