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

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --danger: #ef4444;
    --success: #10b981;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.register-container {
    width: 100%;
    max-width: 480px;
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.register-box {
    background: white;
    border-radius: 1.5rem;
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

h1 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 2rem;
    font-weight: 800;
    text-align: center;
    letter-spacing: -0.025em;
}

.subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.875rem;
}

input[type="text"],
input[type="password"],
input[type="email"] {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    font-size: 1rem;
    background: #f8fafc;
    transition: all 0.2s;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.error-message {
    color: var(--danger);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #fee2e2;
    border-radius: 0.75rem;
    display: none;
    font-weight: 500;
    border: 1px solid #fecaca;
}

.error-message.show {
    display: block;
}

.success-message {
    color: var(--success);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: #d1fae5;
    border-radius: 0.75rem;
    display: none;
    font-weight: 500;
    border: 1px solid #a7f3d0;
}

.success-message.show {
    display: block;
}

button[type="submit"] {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.2);
}

button[type="submit"]:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(79, 70, 229, 0.3);
}

button[type="submit"]:active {
    transform: translateY(0);
}

button[type="submit"]:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.login-link {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.login-link p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.login-link a:hover {
    text-decoration: underline;
}

.required {
    color: var(--danger);
}

.field-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }
    
    .register-box {
        padding: 2rem;
    }
}