/* Reset und Basis-Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #049DD9;
    --secondary-blue: #04B2D9;
    --light-blue: #CEE8F2;
    --gray: #8B8C8C;
    --dark: #0D0D0D;
    --white: #FFFFFF;
    --shadow: 0 8px 24px rgba(13, 13, 13, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, var(--white) 0%, var(--light-blue) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Register Container */
.register-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: relative;
}

/* Header */
.register-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.back-link {
    color: var(--gray);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
}

.back-link:hover {
    color: var(--primary-blue);
    background: var(--light-blue);
}

/* Hauptinhalt */
.register-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}

/* Register Card */
.register-card {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 450px;
    border: 1px solid var(--light-blue);
    animation: slideUp 0.6s ease-out;
}

.card-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.card-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.card-subtitle {
    color: var(--gray);
    font-size: 1rem;
}

/* Formular */
.register-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--dark);
    font-size: 0.9rem;
}

.form-input {
    padding: 1rem;
    border: 2px solid var(--light-blue);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(4, 157, 217, 0.1);
}

.form-input::placeholder {
    color: var(--gray);
    opacity: 0.7;
}

/* Submit Button */
.submit-button {
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    padding: 1.2rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
    font-family: inherit;
    width: 100%;
}

.submit-button:hover {
    background: var(--secondary-blue);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(4, 157, 217, 0.3);
}

.submit-button:active {
    transform: translateY(0);
}

/* Register Footer */
.register-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--light-blue);
}

.register-footer p {
    color: var(--gray);
    font-size: 0.9rem;
}

.login-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.login-link:hover {
    color: var(--secondary-blue);
    text-decoration: underline;
}

/* Hintergrund-Elemente */
.background-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    opacity: 0.05;
    animation: float 8s ease-in-out infinite;
}

.circle-1 {
    width: 150px;
    height: 150px;
    top: 10%;
    right: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 100px;
    height: 100px;
    top: 60%;
    left: 5%;
    animation-delay: 2s;
}

.circle-3 {
    width: 80px;
    height: 80px;
    bottom: 20%;
    right: 20%;
    animation-delay: 4s;
}

/* Animationen */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .register-container {
        padding: 1rem;
    }
    
    .register-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .register-card {
        padding: 2rem;
        margin: 1rem 0;
    }
    
    .card-header h1 {
        font-size: 1.7rem;
    }
}

@media screen and (max-width: 480px) {
    .register-card {
        padding: 1.5rem;
    }
    
    .card-header h1 {
        font-size: 1.5rem;
    }
    
    .submit-button {
        padding: 1rem 1.5rem;
    }
}

/* Barrierefreiheit */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Fokus-Stile */
.form-input:focus,
.submit-button:focus,
.back-link:focus,
.login-link:focus {
    outline: 3px solid var(--secondary-blue);
    outline-offset: 2px;
}

/* Password Strength Indicator (Optional) */
.password-strength {
    margin-top: 0.5rem;
    font-size: 0.8rem;
}

.strength-weak {
    color: #E74C3C;
}

.strength-medium {
    color: #F39C12;
}

.strength-strong {
    color: #27AE60;
}