* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    font-family: 'Segoe UI', '微软雅黑', sans-serif;
    overflow: hidden;
    background: #1a2c3e;
}

/* ============ 登录界面 ============ */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a2c3e 0%, #0f1a24 100%);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: cover;
    background-position: center;
}

.login-card {
    width: 400px;
    background: rgba(32,32,35,0.85);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 24px 48px rgba(0,0,0,0.3);
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-icon img {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.login-title {
    font-size: 32px;
    font-weight: 600;
    color: white;
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 32px;
}

.login-form {
    text-align: left;
}

.input-group {
    margin-bottom: 16px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 12px;
    color: white;
    font-size: 14px;
    outline: none;
}

.input-group input:focus {
    border-color: #0078d4;
    background: rgba(255,255,255,0.15);
}

.login-error {
    color: #ff6b6b;
    font-size: 12px;
    margin-bottom: 16px;
    display: none;
}

.login-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.login-btn-primary {
    flex: 1;
    padding: 12px;
    background: #0078d4;
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.login-btn-primary:hover {
    background: #1084e0;
    transform: translateY(-1px);
}

.login-btn-secondary {
    flex: 1;
    padding: 12px;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 14px;
    cursor: pointer;
}

.login-btn-secondary:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-1px);
}

.login-tip {
    text-align: center;
    font-size: 12px;
    color: rgba(255,255,255,0.4);
}

/* ============ 壁纸层 ============ */
.wallpaper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a2c3e 0%, #0f1a24 100%);
    background-size: cover;
    background-position: center;
    z-index: 0;
}

/* ============ 桌面图标 ============ */
.desktop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 48px;
    padding: 12px;
    z-index: 1;
}

.desktop-icon {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 80px;
    padding: 8px 4px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
    background: rgba(255,255,255,0);
}

.desktop-icon:hover {
    background: rgba(255,255,255,0.12);
    transform: scale(1.02);
}

.desktop-icon.selected {
    background: rgba(0,120,212,0.3);
    border: 1px solid #0078d4;
}

.desktop-icon .icon {
    font-size: 40px;
    margin-bottom: 4px;
}

.desktop-icon .label {
    font-size: 11px;
    text-align: center;
}

.selection-rect {
    position: fixed;
    border: 2px solid #0078d4;
    background: rgba(0,120,212,0.2);
    pointer-events: none;
    z-index: 9999;
    display: none;
}

/* ============ 任务栏 ============ */
.taskbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 44px;
    background: rgba(28,28,30,0.85);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    z-index: 100;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.taskbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.start-btn {
    background: rgba(255,255,255,0.1);
    color: white;
    border: none;
    padding: 6px 18px;
    border-radius: 10px;
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.start-btn::before {
    content: "🍃";
    font-size: 14px;
}

.start-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-1px);
}

.taskbar-apps {
    display: flex;
    gap: 4px;
    flex: 1;
    overflow-x: auto;
    padding: 0 8px;
}

.taskbar-app {
    background: rgba(255,255,255,0.08);
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 11px;
    cursor: pointer;
    white-space: nowrap;
    color: white;
}

.taskbar-app:hover {
    background: rgba(255,255,255,0.18);
}

.taskbar-app.active {
    background: rgba(0,120,212,0.7);
}

.taskbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.system-tray {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border-radius: 8px;
}

.system-tray:hover {
    background: rgba(255,255,255,0.1);
}

.tray-icon {
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: all 0.2s;
    min-width: 24px;
    text-align: center;
}

.tray-icon:hover {
    background: rgba(255,255,255,0.15);
    transform: scale(1.05);
}

.tray-menu {
    background: #2d2f36;
    border-radius: 12px;
    padding: 8px;
    min-width: 200px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    animation: menuFadeIn 0.15s ease;
}

@keyframes menuFadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

#volume-slider {
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: #3c3f4a;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: #0078d4;
    border-radius: 50%;
    cursor: pointer;
}

.clock {
    font-size: 12px;
    color: white;
    background: rgba(0,0,0,0.2);
    padding: 4px 10px;
    border-radius: 16px;
}

.show-desktop-btn {
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    font-size: 12px;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 8px;
}

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

/* ============ 开始菜单 ============ */
.start-menu {
    position: fixed;
    bottom: 52px;
    left: 12px;
    width: 420px;
    background: rgba(32,32,35,0.95);
    backdrop-filter: blur(30px);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    z-index: 200;
    display: none;
    overflow: hidden;
}

.start-menu.show {
    display: block;
    animation: menuFadeIn 0.2s ease;
}

.start-menu-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.user-avatar img {
    width: 48px;
    height: 48px;
    border-radius: 12px;
}

.user-name {
    font-size: 16px;
    font-weight: 600;
    color: white;
}

.user-status {
    font-size: 11px;
    color: rgba(255,255,255,0.6);
}

.start-menu-content {
    padding: 12px 16px;
    max-height: 400px;
    overflow-y: auto;
}

.section-title {
    color: rgba(255,255,255,0.7);
    font-size: 11px;
    margin-bottom: 10px;
}

.apps-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.app-item {
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
}

.app-item:hover {
    background: rgba(255,255,255,0.08);
    transform: translateX(4px);
}

.app-item span:first-child {
    font-size: 20px;
}

.app-item span:last-child {
    font-size: 13px;
}

.start-menu-footer {
    display: flex;
    padding: 10px 16px;
    background: rgba(0,0,0,0.2);
    gap: 8px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.start-menu-footer button {
    flex: 1;
    padding: 8px;
    background: rgba(255,255,255,0.06);
    border: none;
    border-radius: 10px;
    color: white;
    cursor: pointer;
}

.start-menu-footer button:hover {
    background: rgba(255,255,255,0.12);
}

/* ============ 窗口 ============ */
.windows {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 48px;
    z-index: 50;
    pointer-events: none;
}

.window {
    position: absolute;
    background: rgba(32,32,35,0.96);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 300px;
    min-height: 200px;
    pointer-events: auto;
}

.window-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 12px;
    background: rgba(0,0,0,0.25);
    cursor: move;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.window-title {
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    font-size: 12px;
}

.window-controls {
    display: flex;
    gap: 6px;
}

.window-controls span {
    cursor: pointer;
    font-size: 12px;
    color: rgba(255,255,255,0.7);
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
}

.window-controls span:hover {
    background: rgba(255,255,255,0.1);
    color: white;
}

.window-controls .close-btn:hover {
    background: #e81123;
}

.window-content {
    flex: 1;
    padding: 16px;
    overflow: auto;
    color: rgba(255,255,255,0.9);
}

.window::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 12px;
    height: 12px;
    cursor: se-resize;
    background: rgba(255,255,255,0.1);
    border-radius: 0 0 10px 0;
}

/* ============ 浏览器样式 ============ */
.browser-toolbar {
    display: flex;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(0,0,0,0.2);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    flex-wrap: wrap;
}

.browser-nav-buttons, .browser-menu-buttons {
    display: flex;
    gap: 4px;
}

.browser-nav-buttons button, .browser-menu-buttons button {
    background: rgba(255,255,255,0.1);
    border: none;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
}

.browser-address-bar {
    flex: 1;
    display: flex;
    gap: 4px;
}

.browser-url {
    flex: 1;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 20px;
    padding: 6px 12px;
    color: white;
    font-size: 12px;
    outline: none;
}

.browser-url:focus {
    border-color: #0078d4;
}

.browser-go {
    background: #0078d4;
    border: none;
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    cursor: pointer;
}

.browser-bookmarks-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 6px 12px;
    background: rgba(0,0,0,0.15);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    font-size: 11px;
}

.bookmarks-list {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.bookmark-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 8px;
    background: rgba(255,255,255,0.08);
    border-radius: 14px;
    cursor: pointer;
}

.bookmark-item:hover {
    background: rgba(255,255,255,0.18);
}

.bookmark-remove {
    opacity: 0;
    font-size: 10px;
    cursor: pointer;
    color: #ff6b6b;
}

.bookmark-item:hover .bookmark-remove {
    opacity: 1;
}

/* ============ 右键菜单 ============ */
.context-menu {
    position: fixed;
    background: #2d2f36;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    padding: 4px 0;
    z-index: 10000;
    min-width: 160px;
    display: none;
}

.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    color: white;
    font-size: 13px;
}

.context-menu-item:hover {
    background: #0078d4;
}

.context-menu-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 4px 0;
}

/* ============ 通知 ============ */
.notification {
    position: fixed;
    bottom: 56px;
    right: 16px;
    background: rgba(32,32,35,0.95);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    padding: 12px 18px;
    min-width: 260px;
    z-index: 1000;
    display: none;
}

.notification.show {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.notification-title {
    font-weight: 600;
    color: #0078d4;
    margin-bottom: 4px;
}

.notification-message {
    color: white;
    font-size: 12px;
}

/* ============ 设置窗口 ============ */
.settings-window {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 550px;
    background: rgba(32,32,35,0.96);
    backdrop-filter: blur(30px);
    border-radius: 20px;
    z-index: 300;
    display: flex;
    flex-direction: column;
}

.settings-window.hidden {
    display: none;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    padding: 12px 20px;
    background: rgba(0,0,0,0.3);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.settings-header span {
    color: white;
    font-weight: 600;
}

.settings-header button {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    font-size: 18px;
    cursor: pointer;
}

.settings-content {
    padding: 20px;
    max-height: 500px;
    overflow-y: auto;
}

.settings-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 10px;
}

.tab-btn {
    padding: 8px 18px;
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.6);
    cursor: pointer;
    border-radius: 10px;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.06);
    color: white;
}

.tab-btn.active {
    background: rgba(0,120,212,0.8);
    color: white;
}

.tab-content {
    display: none;
}

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

.tab-content h3 {
    color: white;
    font-size: 16px;
    margin-bottom: 16px;
}

.tab-content p {
    color: rgba(255,255,255,0.7);
    margin: 10px 0;
}

.tab-content label {
    color: white;
    display: block;
    margin: 14px 0 6px;
}

.tab-content select {
    padding: 8px 14px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(0,0,0,0.3);
    color: white;
    width: 100%;
}

.tab-content button {
    padding: 8px 18px;
    border-radius: 10px;
    border: none;
    background: rgba(0,120,212,0.8);
    color: white;
    cursor: pointer;
    margin-top: 8px;
    margin-right: 8px;
}

.tab-content button:hover {
    background: #0078d4;
}

/* ============ 滚动条 ============ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.05);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.3);
    border-radius: 10px;
}

/* ============ 浅色主题 ============ */
body.light-theme .wallpaper {
    background: linear-gradient(135deg, #e8f0f5 0%, #d4e0e8 100%);
}

body.light-theme .taskbar {
    background: rgba(240,240,245,0.85);
}

body.light-theme .start-btn, body.light-theme .taskbar-app {
    color: #1a2c3e;
}

body.light-theme .clock, body.light-theme .system-tray {
    color: #1a2c3e;
    background: rgba(0,0,0,0.05);
}

body.light-theme .start-menu {
    background: rgba(255,255,255,0.95);
}

body.light-theme .user-name, body.light-theme .app-item {
    color: #1a2c3e;
}

body.light-theme .window {
    background: rgba(255,255,255,0.96);
}

body.light-theme .window-title {
    color: #1a2c3e;
}

body.light-theme .window-content {
    color: #2d2f36;
}

body.light-theme .context-menu {
    background: white;
}

body.light-theme .context-menu-item {
    color: #1a2c3e;
}

body.light-theme .context-menu-item:hover {
    background: #0078d4;
    color: white;
}

body.light-theme .tray-menu {
    background: rgba(255,255,255,0.95);
    border-color: rgba(0,0,0,0.1);
}

/* ============ 应用管理样式 ============ */
.apps-manager-list {
    max-height: 400px;
    overflow-y: auto;
}

.app-manager-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: rgba(255,255,255,0.05);
    border-radius: 10px;
    margin-bottom: 8px;
    transition: background 0.2s;
}

.app-manager-item:hover {
    background: rgba(255,255,255,0.1);
}

.app-manager-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 12px;
}

.app-manager-icon img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.app-manager-info {
    flex: 1;
}

.app-manager-name {
    font-weight: 600;
    color: white;
    margin-bottom: 4px;
}

.app-manager-path {
    font-size: 11px;
    color: rgba(255,255,255,0.5);
}

.app-manager-actions {
    display: flex;
    gap: 8px;
}

.app-manager-actions button {
    padding: 4px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 11px;
}

.edit-app-btn {
    background: #5bc0de;
    color: white;
}

.delete-app-btn {
    background: #d9534f;
    color: white;
}

.add-app-btn {
    width: 100%;
    padding: 10px;
    background: #5cb85c;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 16px;
    font-size: 14px;
}

.add-app-btn:hover {
    background: #4cae4c;
}

/* ============ 对话框样式 ============ */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dialog {
    width: 500px;
    max-width: 90%;
    background: #2d2f36;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    animation: dialogFadeIn 0.2s ease;
}

@keyframes dialogFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-weight: 600;
    color: white;
}

.dialog-close {
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
}

.dialog-close:hover {
    color: white;
}

.dialog-content {
    padding: 20px;
    max-height: 500px;
    overflow-y: auto;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    color: white;
    margin-bottom: 6px;
    font-size: 12px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 8px 12px;
    background: #3c3f4a;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    color: white;
    font-size: 13px;
    outline: none;
}

.form-group input:focus {
    border-color: #0078d4;
}

.browse-btn {
    margin-top: 6px;
    padding: 4px 12px;
    background: #5bc0de;
    border: none;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    font-size: 11px;
}

.icon-preview {
    width: 48px;
    height: 48px;
    background: #3c3f4a;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-top: 8px;
}

.icon-preview img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.dialog-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.btn-primary {
    padding: 8px 20px;
    background: #0078d4;
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
}

.btn-primary:hover {
    background: #1084e0;
}

.btn-secondary {
    padding: 8px 20px;
    background: #3c3f4a;
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
}

.btn-secondary:hover {
    background: #4a4e5a;
}

.builtin-options {
    background: rgba(0,0,0,0.2);
    padding: 12px;
    border-radius: 8px;
    margin-top: 8px;
}

.builtin-options input {
    width: calc(50% - 8px);
    display: inline-block;
    margin-right: 8px;
}

/* 浅色主题 */
body.light-theme .dialog {
    background: #ffffff;
}

body.light-theme .dialog-header {
    border-bottom-color: rgba(0,0,0,0.1);
    color: #1a2c3e;
}

body.light-theme .form-group input,
body.light-theme .form-group select {
    background: #f0f0f0;
    border-color: rgba(0,0,0,0.1);
    color: #1a2c3e;
}

body.light-theme .icon-preview {
    background: #f0f0f0;
}

body.light-theme .btn-secondary {
    background: #e0e0e0;
    color: #1a2c3e;
}

body.light-theme .builtin-options {
    background: rgba(0,0,0,0.05);
}

body.light-theme .app-manager-item {
    background: rgba(0,0,0,0.05);
}

body.light-theme .app-manager-name {
    color: #1a2c3e;
}

body.light-theme .app-manager-path {
    color: rgba(0,0,0,0.5);
}