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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
    color: #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

body::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 2px,
            rgba(255, 255, 255, 0.03) 2px,
            rgba(255, 255, 255, 0.03) 4px
        );
    animation: slide 20s linear infinite;
}

@keyframes slide {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.login-container {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: linear-gradient(145deg, #ffffff 0%, #f0f0f0 100%);
    color: #000000;
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 
        0 10px 40px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    width: 100%;
    max-width: 420px;
    position: relative;
    overflow: hidden;
}

.login-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #000000, #333333, #000000);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 10px;
    font-size: 36px;
    font-weight: 700;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #000000, #333333);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 18px;
    font-weight: 400;
    color: #666666;
    letter-spacing: 0.5px;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #333333;
}

.form-group input {
    width: 100%;
    padding: 15px 18px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    background-color: #ffffff;
    color: #000000;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: #000000;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.form-group input::placeholder {
    color: #999999;
}

.error-message {
    color: #ff0000;
    margin-bottom: 20px;
    text-align: center;
    min-height: 24px;
    font-size: 14px;
    font-weight: 500;
    padding: 8px;
    border-radius: 8px;
    background-color: rgba(255, 0, 0, 0.05);
}

.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%);
    color: #ffffff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.login-btn:hover::before {
    left: 100%;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.4);
}

.login-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(0, 102, 255, 0.3);
}