:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #ec4899;
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --success-color: #10b981;
}

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

body {
    font-family: 'Tajawal', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic Background */
.background-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
}

.blob {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 10s infinite alternate;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
}

.blob-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-color);
    bottom: -50px;
    left: -100px;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Glass Panel container */
.container {
    width: 90%;
    max-width: 600px;
    padding: 40px;
    border-radius: 24px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, #818cf8, #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.upload-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

.upload-box {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.02);
}

.upload-box:hover, .upload-box.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.icon {
    width: 32px;
    height: 32px;
    margin-bottom: 10px;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.upload-box:hover .icon, .upload-box.active .icon {
    color: var(--primary-color);
}

.upload-label span {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 5px;
}

.upload-label small {
    color: var(--text-muted);
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 90%;
}

.primary-btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s ease;
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 15px 20px -3px rgba(99, 102, 241, 0.5);
}

.primary-btn:active:not(:disabled) {
    transform: translateY(0);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: #334155;
    box-shadow: none;
}

.primary-btn .icon {
    width: 24px;
    height: 24px;
    margin: 0;
    color: white;
}

.hidden {
    display: none !important;
}

/* Progress bar */
#progress-container {
    margin-top: 30px;
    text-align: center;
}

.progress-text {
    margin-bottom: 10px;
    font-size: 1.1rem;
    font-weight: 500;
}

.progress-bar-wrapper {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 0.3s ease;
}

/* Result container */
#result-container {
    margin-top: 30px;
    text-align: center;
    animation: slideUp 0.5s ease forwards;
}

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

#result-container h3 {
    margin-bottom: 20px;
    color: var(--success-color);
}

#output-video {
    width: 100%;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    background: black;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.download-btn .icon {
    width: 20px;
    height: 20px;
    margin: 0;
}