:root {
    --neon-blue: #0ff0fc;
    --neon-pink: #ff2ced;
    --neon-purple: #9d00ff;
    --neon-green: #00ff9d;
    --dark-bg: #0a0a15;
    --darker-bg: #050510;
    --card-bg: rgba(15, 15, 30, 0.9); /* Slightly more opaque */
    --text-primary: #e0e0ff;
    --text-secondary: #a0a0c0;
    --transition: all 0.3s ease; /* Faster, lighter transition */
}

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

body {
    /* Simplified, static background, removing heavy JavaScript particles and complex gradients */
    background: var(--dark-bg);
    font-family: 'Rajdhani', sans-serif;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem; /* Added padding for small screens */
    overflow-x: hidden;
}

/* Accessibility: Hide element visually but keep it available for screen readers */
.sr-only, .a11y-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Main container - No mousemove 3D transform */
.portal-container {
    width: 100%;
    max-width: 850px;
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border-radius: 15px;
    border: 1px solid rgba(0, 255, 157, 0.2);
    box-shadow: 0 0 20px rgba(0, 255, 157, 0.3);
    overflow: hidden;
    z-index: 10;
}

/* Header section - Removed complex shine animation */
.portal-header {
    background: linear-gradient(to right, rgba(0, 255, 157, 0.1), rgba(157, 0, 255, 0.1));
    padding: 2rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid rgba(0, 255, 157, 0.3);
}

.portal-header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.8rem, 5vw, 2.5rem); /* Responsive font size */
    background: linear-gradient(to right, var(--neon-blue), var(--neon-pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 8px rgba(0, 255, 157, 0.5);
    margin-bottom: 1rem;
}

/* Form styling using modern CSS Grid */
.portal-form {
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Auto-responsive grid */
    gap: 1.5rem;
}

.form-section {
    background: rgba(10, 10, 20, 0.6);
    border-radius: 10px;
    padding: 1.5rem;
    border: 1px solid rgba(0, 255, 157, 0.1);
    transition: var(--transition);
}

.form-section:hover {
    border-color: var(--neon-blue);
    box-shadow: 0 0 15px rgba(0, 255, 157, 0.2);
}

legend {
    font-family: 'Orbitron', sans-serif;
    color: var(--neon-blue);
    padding: 0 0.5rem;
    font-size: 1rem;
    text-shadow: 0 0 5px var(--neon-blue);
    margin-bottom: 1rem;
}

/* Input fields */
.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group label {
    position: absolute;
    top: 15px;
    left: 15px;
    color: var(--text-secondary);
    pointer-events: none;
    transition: var(--transition);
    font-size: 1rem;
    padding: 0 5px;
    z-index: 2;
}

.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 15px;
    background: rgba(20, 20, 40, 0.8);
    border: 1px solid rgba(0, 255, 157, 0.2);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    font-family: 'Rajdhani', sans-serif;
}
/* Important: Add 'empty' option to SELECT to make the label effect work */
.input-group select:required:invalid {
    color: var(--text-secondary);
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 10px rgba(0, 255, 157, 0.3);
}

/* Floating label logic (improved for :placeholder-shown and :focus) */
.input-group input:focus + label,
.input-group input:not(:placeholder-shown) + label,
.input-group select:valid + label, /* Use :valid for select */
.input-group textarea:focus + label,
.input-group textarea:not(:placeholder-shown) + label {
    top: -10px;
    left: 10px;
    font-size: 0.8rem;
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
    background: var(--darker-bg);
    padding: 0 8px;
}

.input-group i {
    position: absolute;
    right: 15px;
    top: 15px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.input-group input:focus ~ i,
.input-group select:focus ~ i,
.input-group textarea:focus ~ i {
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
}

/* Custom Radio/Checkbox (A11Y improved: visually hide input and style the label) */
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.custom-radio-label, .custom-checkbox-label {
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
}

.custom-radio-label::before, .custom-checkbox-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition);
}

.custom-checkbox-label::before {
    border-radius: 4px;
}

/* Checked state */
.a11y-hidden:checked + .custom-radio-label::before,
.a11y-hidden:checked + .custom-checkbox-label::before {
    border-color: var(--neon-blue);
    background: var(--neon-blue);
    box-shadow: 0 0 8px var(--neon-blue);
}

.a11y-hidden:checked + .custom-radio-label,
.a11y-hidden:checked + .custom-checkbox-label {
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
}

.a11y-hidden:checked + .custom-radio-label::after {
    content: '';
    position: absolute;
    left: 7px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--darker-bg);
}

.a11y-hidden:checked + .custom-checkbox-label::after {
    content: '\f00c'; /* Font Awesome checkmark icon */
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    position: absolute;
    left: 3px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8rem;
    color: var(--darker-bg);
}


/* File upload */
.file-upload-label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
    background: rgba(20, 20, 40, 0.8);
    border: 2px dashed rgba(0, 255, 157, 0.3);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.file-upload-label:hover {
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    box-shadow: 0 0 10px rgba(0, 255, 157, 0.2);
}

.file-upload-label i {
    margin-right: 10px;
    font-size: 1.2rem;
}

/* Submit button */
.submit-btn {
    grid-column: 1 / -1; /* Make button span all columns */
    background: linear-gradient(45deg, var(--neon-blue), var(--neon-purple));
    color: var(--darker-bg);
    border: none;
    padding: 1rem;
    font-size: 1.1rem;
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 1px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    box-shadow: 0 5px 15px rgba(0, 255, 157, 0.3);
    margin-top: 1rem;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 255, 157, 0.4);
    letter-spacing: 1.5px;
}

.submit-btn i {
    margin-right: 8px;
}

/* Terms and conditions */
.terms {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    margin-top: 0.5rem;
    background: transparent; /* Don't style terms like a section */
    border: none;
    box-shadow: none;
    padding: 0;
}

.terms a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: var(--transition);
    margin-left: 5px;
    text-shadow: 0 0 3px rgba(0, 255, 252, 0.5);
}

.terms a:hover {
    color: var(--neon-pink);
    text-shadow: 0 0 5px var(--neon-pink);
}

/* Focus state for keyboard navigation */
.a11y-hidden:focus + .custom-radio-label,
.a11y-hidden:focus + .custom-checkbox-label,
.file-upload-label:focus,
.submit-btn:focus,
.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    outline: 3px solid var(--neon-pink);
    outline-offset: 2px;
}