:root[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #1e293b;
    --secondary-hover: #334155;
    --accent-1: #8b5cf6;
    --accent-2: #ec4899;
    --success: #10b981;
    --error: #ef4444;
    --input-bg: rgba(15, 23, 42, 0.6);
    --list-bg: rgba(15, 23, 42, 0.5);
    --danger: #f87171;
}

:root[data-theme="light"] {
    --bg-color: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #e2e8f0;
    --secondary-hover: #cbd5e1;
    --accent-1: #8b5cf6;
    --accent-2: #ec4899;
    --success: #10b981;
    --error: #ef4444;
    --input-bg: rgba(255, 255, 255, 0.8);
    --list-bg: rgba(255, 255, 255, 0.6);
    --danger: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: 'Noto Kufi Arabic', 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 60px 20px;
    position: relative;
    overflow-x: hidden;
}

/* Theme Toggle */
.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 100;
    backdrop-filter: blur(10px);
}

:root[data-theme="dark"] .sun-icon { display: block; }
:root[data-theme="dark"] .moon-icon { display: none; }

:root[data-theme="light"] .sun-icon { display: none; }
:root[data-theme="light"] .moon-icon { display: block; }

/* Background Animated Orbs */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out alternate;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-1);
    bottom: -50px;
    left: 10%;
    animation-delay: -5s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: var(--accent-2);
    top: 30%;
    left: -50px;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(50px, 50px) scale(1.1); }
    100% { transform: translate(-50px, 100px) scale(0.9); }
}

.container {
    width: 100%;
    max-width: 650px;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

header {
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 span {
    background: linear-gradient(135deg, var(--accent-2), var(--accent-1));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 480px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.input-group label {
    font-size: 0.95rem;
    font-weight: 600;
}

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

.input-group input:focus, .input-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

optgroup {
    background: var(--bg-color);
    color: var(--text-secondary);
    font-weight: bold;
}
option {
    background: var(--bg-color);
    color: var(--text-primary);
}

/* Range Slider */
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--glass-border);
    outline: none;
    margin-top: 10px;
    margin-bottom: 5px;
}
.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: transform 0.1s;
}
.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.help-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    background: var(--input-bg);
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 16px;
}

.upload-area h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.upload-area p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.hidden {
    display: none !important;
}

/* File List styling */
.file-list-container {
    margin-bottom: 24px;
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.text-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
}
.text-btn:hover {
    color: var(--text-primary);
    text-decoration: underline;
}
.danger-text { color: var(--danger); }
.danger-text:hover { color: #dc2626; }

.file-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 5px;
}

/* custom scrollbar */
.file-list::-webkit-scrollbar { width: 6px; }
.file-list::-webkit-scrollbar-track { background: transparent; }
.file-list::-webkit-scrollbar-thumb { background: var(--glass-border); border-radius: 4px; }

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--list-bg);
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.file-details {
    display: flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}

.file-icon { color: var(--primary-color); flex-shrink: 0; }
.file-name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; font-size: 0.95rem;}
.file-size { font-size: 0.8rem; color: var(--text-secondary); }

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.icon-btn:hover { background: rgba(239, 68, 68, 0.1); color: var(--error); }

.primary-btn, .secondary-btn {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: none;
    text-decoration: none;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-1));
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
    margin-top: 16px;
}
.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6); }

.secondary-btn {
    background: var(--secondary-color);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    margin-top: 12px;
}
.secondary-btn:hover { background: var(--secondary-hover); }

/* Status & Loading */
.status-container, .result-container, .error-container {
    text-align: center;
    padding: 20px 0;
}

.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.loader {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(148, 163, 184, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

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

.success-icon {
    color: var(--success);
    margin-bottom: 16px;
    display: inline-flex;
    padding: 16px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 50%;
}

.error-icon {
    color: var(--error);
    margin-bottom: 16px;
    display: inline-flex;
    padding: 16px;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 50%;
}

.download-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 20px 0;
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--list-bg);
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.download-item .file-name {
    font-weight: 600;
}

.btn-small {
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
}
.btn-small:hover { background: var(--primary-hover); }

/* History Section */
.history-section {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 24px 32px;
}
.history-section h2 { margin-bottom: 16px; font-size: 1.5rem; }

.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--list-bg);
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.history-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.history-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}
.mt-3 { margin-top: 16px; }

@media (max-width: 480px) {
    .glass-panel, .history-section { padding: 20px; }
    h1 { font-size: 2rem; }
}