:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --border-color: #334155;
    --input-bg: #0f172a;
    --success-color: #10b981;
    --error-color: #ef4444;
    --step-inactive: #475569;
    --step-active: #3b82f6;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

.app-container {
    width: 100%;
    max-width: 600px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Header & Stepper */
header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.logo i {
    color: #ff0000;
    font-size: 1.8rem;
}

.stepper-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    position: relative;
    padding: 0 10px;
}

.step-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 2;
    position: relative;
}

.step-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 2px solid var(--step-inactive);
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.step-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

.step-item.active .step-circle {
    border-color: var(--accent-color);
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 0 15px var(--accent-glow);
}

.step-item.active .step-label {
    color: var(--text-primary);
}

.step-item.completed .step-circle {
    border-color: var(--accent-color);
    background-color: var(--bg-color);
    color: var(--accent-color);
}

.step-line {
    flex: 1;
    height: 2px;
    background-color: var(--step-inactive);
    margin: 0 10px;
    margin-bottom: 20px; /* Align with circle center roughly */
    transform: translateY(-10px);
    transition: background-color 0.3s ease;
}

.step-item.active ~ .step-line {
    background-color: var(--step-inactive);
}

/* Logic to color lines before active step could be done in JS or complex CSS selectors, 
   but for simplicity we'll handle "completed" state in JS to color previous lines */
.step-line.completed {
    background-color: var(--accent-color);
}

/* Main Content */
main {
    position: relative;
    min-height: 400px; /* Prevent layout shift */
}

.step-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.step-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background-color: var(--card-bg);
    border-radius: 24px;
    padding: 30px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Inputs */
.input-group {
    position: relative;
    margin-bottom: 30px;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

input[type="text"] {
    width: 100%;
    background-color: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px 16px 16px 48px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.3s ease;
    outline: none;
}

input[type="text"]:focus {
    border-color: var(--accent-color);
}

/* Buttons */
.actions {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.actions.right {
    justify-content: flex-end;
}

.actions.space-between {
    justify-content: space-between;
}

.actions.column {
    flex-direction: column;
    width: 100%;
}

.btn-primary, .btn-secondary {
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: underline;
    padding: 10px;
}

.full-width {
    width: 100%;
}

/* Video Preview */
.video-preview {
    background-color: var(--input-bg);
    border-radius: 16px;
    padding: 15px;
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    align-items: center;
}

.video-preview img {
    width: 100px;
    height: 56px;
    object-fit: cover;
    border-radius: 8px;
}

.video-details h3 {
    font-size: 1rem;
    margin-bottom: 5px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.badge {
    background-color: var(--card-bg);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Options Grid */
.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.option-item label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.select-wrapper {
    position: relative;
}

select {
    width: 100%;
    background-color: var(--input-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 1rem;
    appearance: none;
    cursor: pointer;
    outline: none;
}

select:focus {
    border-color: var(--accent-color);
}

.select-wrapper i {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

/* Progress & Loader */
.center-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

.loader-container {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
}

.circular-loader {
    animation: rotate 2s linear infinite;
    height: 100%;
    transform-origin: center center;
    width: 100%;
}

.loader-path {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
    animation: dash 1.5s ease-in-out infinite;
    stroke: var(--accent-color);
    stroke-linecap: round;
}

@keyframes rotate {
    100% { transform: rotate(360deg); }
}

@keyframes dash {
    0% { stroke-dasharray: 1, 200; stroke-dashoffset: 0; }
    50% { stroke-dasharray: 89, 200; stroke-dashoffset: -35px; }
    100% { stroke-dasharray: 89, 200; stroke-dashoffset: -124px; }
}

.progress-container {
    width: 100%;
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--input-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
    box-shadow: 0 0 10px var(--accent-glow);
}

#progress-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Success */
.success-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(16, 185, 129, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--success-color);
    font-size: 2.5rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--card-bg);
    border: 1px solid var(--error-color);
    color: var(--error-color);
    padding: 12px 24px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 100;
    animation: slideUp 0.3s ease forwards;
}

.toast.hidden {
    display: none;
}

@keyframes slideUp {
    from { opacity: 0; transform: translate(-50%, 20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

/* Responsive */
@media (max-width: 480px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .stepper-container {
        padding: 0;
    }
    
    .step-label {
        display: none;
    }
    
    .card {
        padding: 20px;
    }
}