:root {
    /* AI Builder Theme */
    --wdrf-bg: #f3f4f6;       /* Light Gray Background */
    --wdrf-card-bg: #ffffff;  /* White Card */
    --wdrf-text: #1f2937;     /* Dark Gray Text */
    --wdrf-text-muted: #6b7280; /* Muted Text */
    --wdrf-border: #e5e7eb;   /* Light Border */
    --wdrf-primary: #4f46e5;  /* Indigo/Purple Primary */
    --wdrf-primary-hover: #4338ca; /* Darker Indigo */
    --wdrf-input-bg: #ffffff; /* White Input */
    --wdrf-radius: 12px;      /* Modern Radius */
    --wdrf-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.08);
    --wdrf-font: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--wdrf-bg);
    margin: 0;
    font-family: var(--wdrf-font);
    color: var(--wdrf-text);
    -webkit-font-smoothing: antialiased;
}

.wdrf-container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    box-sizing: border-box;
    background: var(--wdrf-bg);
}

.wdrf-form {
    width: 100%;
    max-width: 900px;
    background: var(--wdrf-card-bg);
    padding: 60px;
    border-radius: var(--wdrf-radius);
    box-shadow: var(--wdrf-shadow);
    position: relative;
    overflow: visible; /* Allow stepper to show if needed */
}

/* Stepper */
.wdrf-progress-container {
    margin-bottom: 50px;
    border-bottom: 1px solid var(--wdrf-border);
    padding-bottom: 20px;
    position: relative;
}

.wdrf-stepper {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    list-style: none;
    padding: 0 20px; /* Padding to allow first/last items to be centered if needed */
    margin: 0;
    position: relative;
    overflow-x: auto;
    gap: 40px; /* Spacing between step titles */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none;  /* IE 10+ */
    /* scroll-behavior: smooth;  Removed to allow JS animation control */
    width: 100%;
    box-sizing: border-box;
}

.wdrf-stepper::-webkit-scrollbar { 
    display: none; /* Chrome/Safari */
}

.wdrf-stepper li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--wdrf-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    opacity: 0.7;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex: 0 0 auto; /* Prevent shrinking */
    cursor: pointer; /* Indicate clickable */
    padding: 8px 12px;
    border-radius: 30px;
}

.wdrf-stepper li:hover {
    background-color: #f3f4f6;
    color: var(--wdrf-text);
}

.wdrf-stepper li.active {
    color: var(--wdrf-primary);
    opacity: 1;
    font-weight: 700;
    transform: scale(1.05); /* Slight emphasis */
    background-color: #e0e7ff; /* Light indigo background for active pill */
}

.wdrf-stepper li .step-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: var(--wdrf-text-muted);
    font-weight: 600;
    transition: all 0.3s ease;
}

.wdrf-stepper li.active .step-icon {
    background: var(--wdrf-primary);
    color: #fff;
    box-shadow: 0 4px 6px rgba(79, 70, 229, 0.3);
}

.wdrf-stepper li.completed .step-icon {
    background: #10b981; /* Green Success */
    color: #fff;
}

.wdrf-stepper li.completed {
    color: var(--wdrf-text);
    opacity: 1;
}

/* Fade effect masks for the slider edges */
.wdrf-progress-container::before,
.wdrf-progress-container::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 20px; /* Account for padding */
    width: 40px;
    z-index: 2;
    pointer-events: none;
}

.wdrf-progress-container::before {
    left: 0;
    background: linear-gradient(to right, var(--wdrf-card-bg), transparent);
}

.wdrf-progress-container::after {
    right: 0;
    background: linear-gradient(to left, var(--wdrf-card-bg), transparent);
}

/* Steps Layout */
.wdrf-step {
    display: none;
    opacity: 0;
}

.wdrf-step.active-step {
    display: block;
    opacity: 1;
}

/* Typography */
.wdrf-step h3 {
    margin-top: 0;
    color: var(--wdrf-text);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* Highlight Effect simulation */
.wdrf-step h3 em {
    font-style: normal;
    background: linear-gradient(120deg, #e0e7ff 0%, #e0e7ff 100%);
    background-repeat: no-repeat;
    background-size: 100% 40%;
    background-position: 0 88%;
    color: var(--wdrf-primary);
}

/* Fields */
.wdrf-field {
    margin-bottom: 32px;
}

.wdrf-field label {
    display: block;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--wdrf-text-muted);
    font-size: 1rem;
    line-height: 1.5;
}

.wdrf-field input[type="text"],
.wdrf-field input[type="email"],
.wdrf-field input[type="tel"],
.wdrf-field textarea,
.wdrf-field select {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--wdrf-border);
    border-radius: 8px;
    background: var(--wdrf-input-bg);
    color: var(--wdrf-text);
    box-sizing: border-box;
    font-size: 1.1rem;
    transition: all 0.2s ease;
    font-family: inherit;
}

.wdrf-field textarea {
    min-height: 120px;
    resize: vertical;
}

.wdrf-field input:focus,
.wdrf-field textarea:focus,
.wdrf-field select:focus {
    border-color: var(--wdrf-primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.wdrf-field input::placeholder,
.wdrf-field textarea::placeholder {
    color: #9ca3af;
}

/* Checkbox & Radio */
.wdrf-checkbox-group,
.wdrf-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.wdrf-checkbox-group label,
.wdrf-radio-group label {
    background: #ffffff;
    border: 1px solid var(--wdrf-border);
    padding: 12px 20px;
    border-radius: 50px; /* Capsule pills for options */
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    transition: all 0.2s ease;
    color: var(--wdrf-text);
    font-size: 0.95rem;
}

.wdrf-checkbox-group label:hover,
.wdrf-radio-group label:hover {
    border-color: var(--wdrf-primary);
    background: #f9fafb;
}

.wdrf-checkbox-group label:has(input:checked),
.wdrf-radio-group label:has(input:checked) {
    border-color: var(--wdrf-primary);
    background: var(--wdrf-primary);
    color: #ffffff;
}

.wdrf-checkbox-group input,
.wdrf-radio-group input {
    margin-right: 8px;
    display: none; /* Hide default radio/checkbox for clean look */
}

/* File Upload */
.wdrf-field input[type="file"] {
    padding: 30px;
    background: #f9fafb;
    border: 2px dashed var(--wdrf-border);
    text-align: center;
}

/* Buttons */
.wdrf-buttons {
    display: flex;
    justify-content: flex-start; /* Align left */
    align-items: center;
    gap: 16px;
    margin-top: 40px;
    padding-top: 20px;
    border-top: none;
}

.wdrf-next-btn,
.wdrf-submit-btn,
.wdrf-prev-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    padding: 0 24px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.wdrf-next-btn,
.wdrf-submit-btn {
    background: var(--wdrf-primary);
    color: #fff;
}

.wdrf-next-btn:hover,
.wdrf-submit-btn:hover {
    background: var(--wdrf-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.wdrf-prev-btn {
    background: #ffffff;
    border: 1px solid var(--wdrf-border);
    color: var(--wdrf-text);
}

.wdrf-prev-btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
}

/* Animations */
.wdrf-slide-in-right { animation: slideInRight 0.3s ease-out forwards; }
.wdrf-slide-out-left { animation: slideOutLeft 0.3s ease-in forwards; }
.wdrf-slide-in-left { animation: slideInLeft 0.3s ease-out forwards; }
.wdrf-slide-out-right { animation: slideOutRight 0.3s ease-in forwards; }

@keyframes slideInRight { from { opacity: 0; transform: translateX(10px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideOutLeft { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(-10px); } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-10px); } to { opacity: 1; transform: translateX(0); } }
@keyframes slideOutRight { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(10px); } }

.shake { animation: shake 0.3s ease-in-out; }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }

/* Mobile */
@media (max-width: 640px) {
    .wdrf-form { padding: 24px; }
    /* .wdrf-stepper { display: none; }  Removed to show stepper on mobile as slider */
    .wdrf-stepper li {
        font-size: 0.85rem;
        padding: 6px 10px;
    }
    .wdrf-buttons { flex-direction: row; }
}