:root {
    --header-height: 60px;
    --drawer-width: 280px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme (Enhanced Premium) */
[data-theme="dark"] {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --surface: #1e293b;
    --card-bg: #1e293b;
    --primary: #8b5cf6;
    --primary-hover: #7c3aed;
    --accent: #ec4899;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: rgba(148, 163, 184, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.75);
    --glass-border: rgba(139, 92, 246, 0.2);
    --shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 60px -15px rgba(0, 0, 0, 0.6);
}

/* Light Theme (Enhanced Premium) */
[data-theme="light"] {
    --bg: #f8fafc;
    --bg-secondary: #ffffff;
    --surface: #ffffff;
    --card-bg: #ffffff;
    --primary: #7c3aed;
    --primary-hover: #6d28d9;
    --accent: #ec4899;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: rgba(148, 163, 184, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(124, 58, 237, 0.15);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Cairo', sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Form Controls */
input,
textarea,
select {
    width: 100%;
    font-family: inherit;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    color: var(--text);
    padding: 12px 14px;
    border-radius: 10px;
    outline: none;
    transition: var(--transition);
    font-size: 14px;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

/* Top Bar */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: var(--shadow);
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.app-title {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.menu-btn {
    background: transparent;
    border: none;
    font-size: 26px;
    cursor: pointer;
    padding: 8px;
    border-radius: 10px;
    transition: var(--transition);
    color: var(--text);
}

.menu-btn:hover {
    background: var(--bg-secondary);
    transform: scale(1.1);
}

/* Status Bar */
.status-bar {
    margin: calc(var(--header-height) + 16px) 16px 16px;
    padding: 14px 20px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.15));
    border: 1.5px solid var(--glass-border);
    border-radius: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.3px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.status-badge.pro {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.status-badge.trial {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

/* Drawer */
.drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.drawer-overlay.open {
    opacity: 1;
    visibility: visible;
}

.drawer {
    position: fixed;
    top: 0;
    bottom: 0;
    right: -280px;
    width: var(--drawer-width);
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    z-index: 100;
    transition: var(--transition);
    box-shadow: -6px 0 30px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--glass-border);
}

.drawer.open {
    right: 0;
}

.drawer-search {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.drawer-search input {
    background: var(--bg);
    border-color: var(--border);
}

.drawer-content {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.nav-category {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    margin: 18px 12px 10px;
}

.nav-item {
    padding: 14px 18px;
    margin: 5px 0;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover {
    background: var(--bg-secondary);
    transform: translateX(-6px);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-weight: 700;
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.35);
    transform: translateX(-6px);
}

/* Main Content */
.main-content {
    margin-top: calc(var(--header-height) + 85px);
    padding: 0 16px 50px;
    max-width: 850px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

.card {
    background: var(--card-bg);
    border-radius: 18px;
    padding: 26px;
    box-shadow: var(--shadow);
    border: 1.5px solid var(--border);
    transition: var(--transition);
    margin-bottom: 20px;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

/* Buttons */
.btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    border: none;
    padding: 13px 26px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.35);
    font-size: 15px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.3px;
}

.btn:hover {
    background: linear-gradient(135deg, var(--primary-hover), #6d28d9);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.45);
}

.btn:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    border: 2.5px solid var(--primary);
    color: var(--primary);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.3);
}

/* File Manager */
.file-drop-area {
    border: 2.5px dashed var(--border);
    border-radius: 14px;
    padding: 45px 25px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(139, 92, 246, 0.02);
}

.file-drop-area:hover,
.file-drop-area.dragover {
    border-color: var(--primary);
    background: rgba(139, 92, 246, 0.08);
    transform: scale(1.01);
}

.file-list {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1.5px solid var(--border);
    transition: var(--transition);
}

.file-item:hover {
    border-color: var(--primary);
    transform: translateX(-3px);
}

/* Utilities */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border);
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    cursor: pointer;
    box-shadow: 0 3px 10px rgba(139, 92, 246, 0.5);
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    cursor: pointer;
    border: none;
    box-shadow: 0 3px 10px rgba(139, 92, 246, 0.5);
}

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

    to {
        transform: translate(-50%, 0);
        opacity: 1;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (min-width: 768px) {
    .drawer {
        right: 0;
        width: 260px;
        box-shadow: none;
        border-left: 1.5px solid var(--border);
        z-index: 10;
        top: var(--header-height);
        bottom: 0;
    }

    .drawer-overlay {
        display: none;
    }

    .menu-btn:first-child {
        display: none;
    }

    #app {
        padding-right: 260px;
    }

    .status-bar {
        margin-right: 260px;
    }
}