:root {
    --primary-green: #00d084;
    --dark-bg: #0a0a0a;
    --card-bg: #1a1a1a;
    --text-white: #ffffff;
    --text-gray: #b0b0b0;
    --border-color: #2a2a2a;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--dark-bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    position: relative;
    overflow: hidden;
}

body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(0, 208, 132, 0.1) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

.login-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 208, 132, 0.1);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 25px 70px rgba(0, 208, 132, 0.15);
}

.logo-section {
    text-align: center;
    margin-bottom: 30px;
}

.logo-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-green), #00b871);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    box-shadow: 0 10px 30px rgba(0, 208, 132, 0.3);
}

.logo-icon i {
    font-size: 40px;
    color: white;
}

.login-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-gray);
}

.form-label {
    color: var(--text-white);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}

.form-control {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-white);
    padding: 12px 16px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-control:focus {
    background: var(--dark-bg);
    border-color: var(--primary-green);
    color: var(--text-white);
    box-shadow: 0 0 0 3px rgba(0, 208, 132, 0.1);
}

.form-control::placeholder {
    color: #666;
}

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-gray);
    z-index: 10;
}

.form-control.with-icon {
    padding-left: 45px;
}

.btn-login {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-green), #00b871);
    border: none;
    border-radius: 10px;
    color: white;
    font-weight: 600;
    font-size: 15px;
    padding: 14px;
    margin-top: 20px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-login::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 ease;
}

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

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 208, 132, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

.alert {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.3);
    border-radius: 10px;
    color: #ff6b6b;
    font-size: 13px;
    padding: 12px 16px;
    margin-bottom: 20px;
}

.form-check-input {
    background-color: var(--dark-bg);
    border: 1px solid var(--border-color);
}

.form-check-input:checked {
    background-color: var(--primary-green);
    border-color: var(--primary-green);
}

.form-check-label {
    color: var(--text-gray);
    font-size: 13px;
}

.spinner-border-sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

@media (max-width: 480px) {
    .login-card {
        padding: 30px 25px;
    }
    
    .login-title {
        font-size: 24px;
    }
}