* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f4f6f9;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Header */
.top-bar {
    background: white;
    border-bottom: 1px solid #ddd;
    padding: 10px 0;
    text-align: center;
    font-size: 13px;
    letter-spacing: 1px;
    color: #333;
}

.top-content span {
    display: block;
}

/* Main Section */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Logo Section */
.logo-section {
    text-align: center;
    margin-bottom: 30px;
}

.logo-section img {
    width: 110px;
    margin-bottom: 15px;
}

.logo-section h1 {
    font-size: 20px;
    font-weight: 500;
    color: #333;
}

/* Card */
.card {
    background: white;
    width: 380px;
    padding: 35px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    text-align: center;
}

.card h3 {
    margin-bottom: 20px;
    font-weight: 500;
}

/* Input */
.input-group input {
    width: 100%;
    padding: 12px;
    font-size: 18px;
    border: 1px solid #ccc;
    border-radius: 6px;
    text-align: center;
    outline: none;
}

.input-group input:focus {
    border-color: #2f63d7;
}

/* Button */
button {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    font-size: 16px;
    background: #2f63d7;
    border: none;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #1e4bb8;
}

/* Error */
#error {
    margin-top: 15px;
    color: red;
    font-size: 14px;
}

/* Footer */
footer {
    text-align: center;
    padding: 15px;
    font-size: 12px;
    background: white;
    border-top: 1px solid #ddd;
}