:root {
    --lego-red: #D92328;  
    --lego-red-hover: #b91c20;
    --lego-blue: #006CB7;   
    --lego-blue-hover: #005596;
    --lego-yellow: #FFD500;
    --text-dark: #1a1a1a;
    --text-grey: #666666;
    --bg-color: #f8f9fa;
    --border-color: #e2e8f0;
    --shadow-soft: 0 10px 40px rgba(0, 0, 0, 0.08);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --header-height: 80px;
}

* { box-sizing: border-box; }

body {
    background-color: var(--bg-color);
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content, .main-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
    width: 100%;
    min-height: calc(90vh - var(--header-height));
}

.login-container, .register-container {
    background: #ffffff;
    width: 100%;
    max-width: 420px;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(0,0,0,0.02);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    margin-top: 0;
    margin-bottom: 10px;
    text-align: center;
    color: var(--text-dark);
    font-size: 1.8rem;
    font-weight: 700;
}

.error-msg {
    background-color: #fff5f5;
    color: #e53e3e;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    text-align: center;
    border: 1px solid #fed7d7;
    margin-bottom: 20px;
}

.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-dark);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.2s;
    background-color: #fcfcfc;
}

.form-group input:focus {
    outline: none;
    border-color: var(--lego-blue);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(0, 108, 183, 0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--text-grey);
    font-size: 0.8rem;
}

.captcha-group {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}
.captcha-visual { display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 10px; }
.captcha-input { width: 100%; padding: 10px; border-radius: 8px; border: 1px solid #ddd; text-align: center; }
#captcha-refresh { border: none; background: transparent; font-size: 1.2rem; cursor: pointer; color: var(--lego-blue); }

.btn-submit {
    width: 100%;
    background-color: var(--lego-red);
    color: white;
    padding: 14px;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s, transform 0.1s;
    margin-top: 10px;
}
.btn-submit:hover { background-color: var(--lego-red-hover); transform: translateY(-1px); }

.login-footer { margin-top: 25px; text-align: center; font-size: 0.9rem; color: var(--text-grey); border-top: 1px solid var(--border-color); padding-top: 20px; }
.login-footer p { margin: 8px 0; }
.login-footer a { color: var(--lego-blue); text-decoration: none; font-weight: 600; }
.login-footer a:hover { text-decoration: underline; }