* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Arial, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #f3f5f9;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 850px;
    background: #ffffff;
    border-radius: 24px;
    padding: 60px 50px;
    text-align: center;
    box-shadow:
        0 10px 30px rgba(0,0,0,0.08),
        0 2px 8px rgba(0,0,0,0.05);
}

.logo {
    width: 420px;
    max-width: 100%;
    margin-bottom: 30px;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 20px;
}

.subtitle {
    font-size: 1.3rem;
    color: #6b7280;
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #1677ff, #0056d6);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: 12px;
    padding: 16px 48px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 4px 12px rgba(22,119,255,0.25);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(22,119,255,0.35);
}

.login-container {
    max-width: 600px;
}

.login-container .logo {
    width: 250px;
    margin-bottom: 20px;
}

.login-container h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

form {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

input {
    width: 100%;
    padding: 16px;
    border: 1px solid #d1d5db;
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
}

input:focus {
    border-color: #1677ff;
    box-shadow: 0 0 0 4px rgba(22,119,255,0.1);
}

.error {
    background: #fff1f1;
    color: #dc2626;
    border: 1px solid #fecaca;
    border-radius: 12px;
    padding: 14px;
    margin-top: 10px;
    display: none;
}