:root {
    --font-family-sans: 'Inter', sans-serif;
    --color-primary: #4f46e5; 
    --color-primary-hover: #4338ca; 
    --color-text-dark: #1f2937; 
    --color-text-medium: #4b5563; 
    --color-text-light: #ffffff;
    --border-radius-lg: 0.5rem; 
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --color-error-bg: #fee2e2;
    --color-error-text: #b91c1c;
    --color-error-border: #ef4444;
    --color-success-bg: #d1fae5; 
    --color-success-text: #047857; 
    --color-success-border: #10b981;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-family-sans);
    background-color: #f3f4f6; 
    color: var(--color-text-medium);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 2rem 0;
}
a { text-decoration: none; color: var(--color-primary); }
a:hover { text-decoration: underline; }
.register-container {
    background-color: var(--color-text-light);
    padding: 2rem 2.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 90%;
    max-width: 650px; /* Increased max-width for more fields */
    margin-top: 1rem; 
    margin-bottom: 2rem;
}
.register-header { text-align: center; margin-bottom: 1.5rem; }
.register-header .logo { font-size: 1.8rem; font-weight: 700; color: var(--color-primary); display: flex; align-items: center; justify-content: center; margin-bottom: 0.5rem; }
.register-header .logo i { margin-right: 0.5rem; }
.register-header h1 { font-size: 1.75rem; color: var(--color-text-dark); margin-bottom: 0.5rem; }
.register-header p { color: var(--color-text-medium); font-size: 0.9rem; }
 
.message-area { margin-bottom: 1.5rem; }
.message { padding: 0.75rem 1.25rem; border-radius: var(--border-radius-lg); font-size: 0.9rem; text-align: left; }
.message.error { background-color: var(--color-error-bg); color: var(--color-error-text); border: 1px solid var(--color-error-border); }
.message.success { background-color: var(--color-success-bg); color: var(--color-success-text); border: 1px solid var(--color-success-border); }
.message ul { list-style-position: inside; padding-left: 0.5rem;}
 
.form-group { margin-bottom: 1rem; text-align: left; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--color-text-dark); margin-bottom: 0.375rem; }
 
.form-group .input-wrapper { /* Wrapper for input and icon */
    position: relative;
    display: flex;
    align-items: center;
}
.form-group input[type="text"], 
.form-group input[type="email"], 
.form-group input[type="password"], 
.form-group input[type="file"], 
.form-group textarea { 
    width: 100%; padding: 0.625rem 0.875rem; border: 1px solid #d1d5db; 
    border-radius: var(--border-radius-lg); font-size: 0.9rem; 
}
/* Adjust padding for password input if icon is inside */
.form-group .input-wrapper input[type="password"],
.form-group .input-wrapper input[type="text"] { /* For when type changes */
     padding-right: 2.8rem; /* Make space for the icon */
}
.form-group input:focus, .form-group textarea:focus { 
    border-color: var(--color-primary); outline: 0; box-shadow: 0 0 0 0.2rem rgba(79, 70, 229, 0.25); 
}
.form-group input[type="file"] { padding: 0.5rem; } /* Specific padding for file inputs */

/* Password toggle icon style */
.password-toggle-icon {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--color-text-medium);
    z-index: 10;
    padding: 0.25rem;
}
.password-toggle-icon:hover {
    color: var(--color-primary);
}

.avatar-selection-container { margin-bottom: 1.5rem; }
.avatar-selection-container label:first-of-type {text-align:left; font-size: 0.875rem; font-weight: 500; color: var(--color-text-dark); margin-bottom: 0.5rem; display:block;}
.avatar-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(60px, 1fr)); gap: 0.75rem; }
.avatar-option { cursor: pointer; border: 3px solid transparent; border-radius: 50%; overflow: hidden; transition: border-color 0.2s ease-in-out, transform 0.2s ease-in-out; width: 60px; height: 60px; margin: 0 auto; }
.avatar-option img { width: 100%; height: 100%; object-fit: cover; }
.avatar-option.selected { border-color: var(--color-primary); transform: scale(1.1); }
.avatar-option:hover { border-color: var(--color-primary-hover); }
input[type="radio"][name="avatar"] { display: none; }
 
.btn-submit { display: block; width: 100%; background-color: var(--color-primary); color: var(--color-text-light); font-weight: 600; padding: 0.75rem 1.5rem; border-radius: var(--border-radius-lg); border: none; cursor: pointer; transition: background-color 0.2s ease-in-out; font-size: 1rem; margin-top: 1.5rem; }
.btn-submit:hover { background-color: var(--color-primary-hover); }
.login-link-container { text-align: center; margin-top: 1.5rem; font-size: 0.875rem; }
.login-link-container p { margin-bottom: 0.5rem;}
@media (max-width: 480px) { .register-container { padding: 1.5rem; } .avatar-grid { grid-template-columns: repeat(auto-fill, minmax(50px, 1fr)); } .avatar-option { width: 50px; height: 50px; } }