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

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #0f172a;
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

.login-box {
    width: 420px;
    background: #1e293b;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
}

.logo {
    text-align: center;
    font-size: 48px;
    margin-bottom: 15px;
}

h1 {
    color: white;
    text-align: center;
    font-size: 26px;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: #94a3b8;
    margin-bottom: 30px;
}

input {
    width: 100%;
    height: 45px;
    margin-bottom: 15px;
    border: 1px solid #475569;
    border-radius: 8px;
    padding-left: 15px;
    background: #334155;
    color: white;
    font-size: 15px;
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s;
}

input::placeholder {
    color: #64748b;
}

input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

button {
    width: 100%;
    height: 45px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    background: #2563eb;
    color: white;
    transition: background 0.18s, transform 0.1s;
}

button:hover {
    background: #1d4ed8;
}

button:active {
    transform: translateY(1px);
    background: #1e40af;
}

button:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.5);
}

#msg {
    margin-top: 15px;
    text-align: center;
    color: #ef4444;
    font-size: 14px;
}