:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(255, 255, 255, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.auth-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 2px, transparent 2px);
    background-size: 50px 50px;
    animation: backgroundMove 60s linear infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.auth-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    max-width: 450px;
    width: 100%;
    padding: 48px;
    border: 1px solid var(--glass-border);
    animation: fadeInUp 0.6s ease-out;
    position: relative;
    z-index: 1;
}

.auth-header {
    text-align: center;
    margin-bottom: 40px;
    animation: slideIn 0.8s ease-out;
}

.auth-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--primary-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.4s ease-out;
}

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

.auth-title {
    font-size: 32px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.auth-subtitle {
    color: #64748b;
    font-size: 15px;
    font-weight: 400;
}

.form-group {
    margin-bottom: 24px;
    animation: fadeInUp 1s ease-out;
}

.form-label {
    display: block;
    font-weight: 600;
    color: #334155;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 15px;
    transition: var(--transition-base);
    background: white;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-control::placeholder {
    color: #94a3b8;
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: 24px;
    animation: fadeInUp 1.1s ease-out;
}

.form-check-input {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    accent-color: #667eea;
}

.form-check-label {
    font-size: 14px;
    color: #64748b;
    cursor: pointer;
    user-select: none;
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    animation: fadeInUp 1.2s ease-out;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
    animation: slideIn 0.5s ease-out;
}

.alert-danger {
    background: #fee2e2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.invalid-feedback {
    display: block;
    color: #dc2626;
    font-size: 13px;
    margin-top: 6px;
    animation: slideIn 0.3s ease-out;
}

.is-invalid {
    border-color: #dc2626 !important;
}

.is-invalid:focus {
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.1) !important;
}

@media (max-width: 576px) {
    .auth-card {
        padding: 32px 24px;
    }

    .auth-title {
        font-size: 28px;
    }
}