:root {
    --primary: #6C5CE7;
    --secondary: #A29BFE;
    --accent: #FFEAA7;
    --bg: #1A0E2E;
    --surface: rgba(43, 27, 84, 0.6);
    --border: rgba(162, 155, 254, 0.2);
    --text: #F8FAFC;
    --text-muted: #BDB2FF;

    --chrome-dark: #202124;
    --chrome-light: #DEE1E6;
    --safari-dark: #323232;
    --safari-light: #F6F6F6;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(108, 92, 231, 0.2), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(255, 234, 167, 0.1), transparent 40%);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 2rem;
}

.glass-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 1rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.main-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
}

.glass-panel {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: white;
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Upload areas */
.drop-zone {
    border: 2px dashed var(--secondary);
    border-radius: 12px;
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(162, 155, 254, 0.05);
}

.drop-zone:hover,
.drop-zone.dragover {
    background: rgba(162, 155, 254, 0.15);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.compare-drop-zone {
    padding: 1rem;
    border-color: rgba(255, 234, 167, 0.5);
    background: rgba(255, 234, 167, 0.05);
}

.upload-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.file-types {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Controls sidebar */
.controls-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    height: fit-content;
    position: sticky;
    top: 2rem;
}

.section-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.size-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.size-option {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.primary-btn {
    width: 100%;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.primary-btn:hover {
    background: #5A4FCF;
    transform: translateY(-2px);
}

.segmented-control {
    display: flex;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 4px;
}

.segment {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.segment.active {
    background: var(--primary);
    color: white;
}

.downloads-container {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.download-link {
    display: block;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
    text-align: center;
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s;
}

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

/* Previews Area */
.preview-area {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-block {
    overflow: hidden;
}

.empty-state {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px;
    border: 1px dashed var(--border);
    border-radius: 12px;
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* Browser Mocks base logic */
.browser-ui {
    border-radius: 8px;
    overflow: hidden;
    transition: background 0.3s;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

/* Dark/Light mode vars for browsers */
.browser-ui.dark-theme {
    --chrome-bg: var(--chrome-dark);
    --chrome-tab: #323639;
    --chrome-tab-active: #323639;
    --chrome-text: #F1F3F4;
    --safari-bg: var(--safari-dark);
    --safari-text: #FFFFFF;
}

.browser-ui.light-theme {
    --chrome-bg: #DFE1E5;
    --chrome-tab: #DFE1E5;
    --chrome-tab-active: #FFFFFF;
    --chrome-text: #3C4043;
    --safari-bg: var(--safari-light);
    --safari-text: #000000;
}

/* Chrome mock */
#chrome-ui {
    background: var(--chrome-bg);
    padding-top: 8px;
}

.browser-tabs {
    display: flex;
    padding: 0 8px;
    align-items: flex-end;
}

.browser-tab {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    background: var(--chrome-tab);
    color: var(--chrome-text);
    border-radius: 8px 8px 0 0;
    max-width: 240px;
    min-width: 160px;
    font-size: 13px;
    gap: 8px;
    margin-right: 4px;
    opacity: 0.7;
}

.browser-tab.active {
    background: var(--chrome-tab-active);
    opacity: 1;
}

.fav-img {
    width: 16px;
    height: 16px;
    object-fit: contain;
}

.tab-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tab-close {
    font-size: 16px;
    color: inherit;
    opacity: 0.6;
    cursor: default;
}

.browser-tab-add {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--chrome-text);
    font-size: 18px;
    border-radius: 50%;
}

.browser-toolbar {
    background: var(--chrome-tab-active);
    padding: 8px;
    display: flex;
    align-items: center;
}

.url-bar {
    background: rgba(0, 0, 0, 0.1);
    color: var(--chrome-text);
    border-radius: 16px;
    padding: 6px 16px;
    font-size: 13px;
    flex: 1;
}

.browser-ui.dark-theme .url-bar {
    background: #202124;
}

/* Safari mock */
#safari-ui {
    background: var(--safari-bg);
    color: var(--safari-text);
}

.safari-toolbar {
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.browser-ui.dark-theme .safari-toolbar {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.safari-nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    font-size: 18px;
    opacity: 0.5;
}

.safari-url-bar {
    flex: 1;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 6px;
    padding: 6px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
}

.browser-ui.dark-theme .safari-url-bar {
    background: rgba(255, 255, 255, 0.1);
}

.safari-bookmarks {
    padding: 8px 16px;
    display: flex;
    gap: 16px;
    font-size: 12px;
}

.bookmark-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.mock-icon {
    width: 16px;
    height: 16px;
    background: #ddd;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-size: 10px;
}

/* OS UI mocks */
.split-previews {
    display: flex;
    gap: 1.5rem;
}

.half-width {
    flex: 1;
}

.mobile-ui {
    background: #000;
    background-image: linear-gradient(to bottom, #141E30, #243B55);
    height: 200px;
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-content: flex-start;
}

.app-icon-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    width: 60px;
}

.ios-app-icon {
    width: 60px;
    height: 60px;
    background: white;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.ios-app-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.app-name {
    color: white;
    font-size: 11px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Windows Taskbar */
.windows-ui {
    background: #000;
    /* representing screen bg */
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%"><rect width="100%" height="100%" fill="%230b4d8c"/></svg>');
    height: 200px;
    border-radius: 16px;
    display: flex;
    align-items: flex-end;
}

.taskbar-icons {
    width: 100%;
    height: 48px;
    background: rgba(32, 32, 32, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    backdrop-filter: blur(10px);
}

.win-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    border-radius: 4px;
}

.win-icon:hover,
.app-task.active-task {
    background: rgba(255, 255, 255, 0.1);
}

.win-start {
    font-size: 20px;
    color: #00A4EF;
}

.search-box {
    width: 120px;
    height: 30px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    color: #666;
    font-size: 12px;
    display: flex;
    align-items: center;
    padding-left: 12px;
}

.app-task img {
    width: 24px;
    height: 24px;
    object-fit: cover;
    border-radius: 2px;
}

.hidden {
    display: none !important;
}

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge.primary {
    background: var(--primary);
    color: white;
}

.badge.secondary {
    background: var(--secondary);
    color: var(--bg);
}

#comparison-header {
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
}

@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .split-previews {
        flex-direction: column;
    }
}