/* ===== CSS Variables ===== */
:root {
    --primary-color: #0078d4;
    --primary-hover: #1084d8;
    --secondary-color: #2d2d2d;
    --bg-dark: #1e1e1e;
    --bg-light: #f3f3f3;
    --text-light: #ffffff;
    --text-dark: #1e1e1e;
    --border-color: #3d3d3d;
    --window-bg: #f0f0f0;
    --sidebar-bg: #2b2b2b;
    --taskbar-bg: #1f1f1f;
    --accent-color: #0078d4;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --transition: all 0.3s ease;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --border-radius: 8px;
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    overflow: hidden;
    user-select: none;
    background: var(--bg-dark);
    color: var(--text-light);
}

.hidden {
    display: none !important;
}

/* ===== Boot Screen ===== */
#boot-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.boot-logo {
    text-align: center;
    animation: fadeIn 1s ease;
}

.boot-logo i {
    font-size: 100px;
    color: var(--primary-color);
    margin-bottom: 20px;
    animation: pulse 2s infinite;
}

.boot-logo h1 {
    font-size: 48px;
    font-weight: 300;
    margin-bottom: 30px;
    letter-spacing: 5px;
}

.boot-progress {
    width: 300px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.boot-progress-bar {
    width: 0%;
    height: 100%;
    background: var(--primary-color);
    animation: bootProgress 3s ease forwards;
}

.boot-text {
    margin-top: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

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

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes bootProgress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* ===== Desktop ===== */
#desktop {
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

/* ===== Desktop Icons ===== */
#desktop-icons {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 50;
}

.desktop-icon {
    width: 80px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.desktop-icon:hover {
    background: rgba(255, 255, 255, 0.15);
}

.desktop-icon:active {
    background: rgba(255, 255, 255, 0.25);
}

.desktop-icon.selected {
    background: rgba(0, 120, 212, 0.3);
    border: 1px solid rgba(0, 120, 212, 0.5);
}

.desktop-icon i {
    font-size: 40px;
    color: var(--text-light);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.desktop-icon span {
    font-size: 11px;
    text-align: center;
    color: var(--text-light);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    word-break: break-word;
}

/* ===== Sidebar ===== */
#sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 56px;
    height: calc(100vh - 48px);
    background: rgba(43, 43, 43, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: var(--transition);
}

#sidebar.visible {
    transform: translateX(0);
}

.sidebar-apps {
    flex: 1;
    padding: 8px 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sidebar-app {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 8px;
    margin-bottom: 4px;
}

.sidebar-app:hover {
    background: rgba(255, 255, 255, 0.15);
}

.sidebar-app:active {
    background: rgba(255, 255, 255, 0.25);
}

.sidebar-app i {
    font-size: 20px;
    color: var(--text-light);
}

.sidebar-footer {
    padding: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: center;
}

.sidebar-user {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
}

.sidebar-user:hover {
    background: rgba(255, 255, 255, 0.15);
}

.sidebar-user i {
    font-size: 28px;
    color: var(--primary-color);
}

/* ===== Taskbar ===== */
#taskbar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 48px;
    background: var(--taskbar-bg);
    display: flex;
    align-items: center;
    padding: 0 10px;
    z-index: 1000;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
}

#start-button {
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

#start-button:hover {
    background: rgba(255, 255, 255, 0.1);
}

#start-button i {
    font-size: 20px;
    color: var(--primary-color);
}

#taskbar-apps {
    flex: 1;
    display: flex;
    gap: 5px;
    margin-left: 10px;
    overflow-x: auto;
}

.taskbar-app {
    min-width: 44px;
    height: 40px;
    padding: 0 15px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.taskbar-app:hover {
    background: rgba(255, 255, 255, 0.15);
}

.taskbar-app.active {
    background: rgba(255, 255, 255, 0.2);
    border-bottom: 2px solid var(--primary-color);
}

.taskbar-app i {
    font-size: 16px;
}

.taskbar-app span {
    font-size: 12px;
}

#taskbar-tray {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 0 10px;
}

.tray-item {
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

.tray-item:hover {
    color: var(--primary-color);
}

#clock {
    font-size: 13px;
    padding: 5px 10px;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
}

#clock:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ===== Start Menu ===== */
#start-menu {
    position: fixed;
    bottom: 58px;
    left: 10px;
    width: 320px;
    background: var(--secondary-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    z-index: 999;
    overflow: hidden;
    animation: slideUp 0.2s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.start-menu-header {
    padding: 20px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
}

.start-menu-header i {
    font-size: 32px;
}

.start-menu-apps {
    padding: 10px;
    max-height: 300px;
    overflow-y: auto;
}

.start-menu-app {
    padding: 12px 15px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.start-menu-app:hover {
    background: rgba(255, 255, 255, 0.1);
}

.start-menu-app i {
    width: 24px;
    text-align: center;
    font-size: 18px;
    color: var(--primary-color);
}

.start-menu-footer {
    padding: 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
}

.start-menu-action {
    padding: 10px 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.start-menu-action:hover {
    background: rgba(255, 255, 255, 0.1);
}

.start-menu-action i {
    font-size: 20px;
}

.start-menu-action span {
    font-size: 11px;
}

/* ===== Context Menu ===== */
#context-menu {
    position: fixed;
    background: var(--secondary-color);
    border-radius: 6px;
    box-shadow: var(--shadow);
    z-index: 2000;
    min-width: 180px;
    padding: 5px 0;
    animation: fadeIn 0.15s ease;
}

.context-menu-item {
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition);
}

.context-menu-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.context-menu-item i {
    width: 16px;
    text-align: center;
    font-size: 14px;
}

.context-menu-item span {
    font-size: 13px;
}

.context-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 5px 0;
}

/* ===== Windows Container ===== */
#windows-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: calc(100vh - 48px);
    z-index: 10;
}

/* ===== Window Styles ===== */
.window {
    position: absolute;
    min-width: 400px;
    min-height: 300px;
    background: var(--window-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.window.focused {
    z-index: 100;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.window.maximized {
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: calc(100vh - 48px) !important;
    border-radius: 0;
}

.window-header {
    height: 36px;
    background: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 10px;
    cursor: move;
}

.window-title {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-light);
}

.window-title i {
    font-size: 14px;
    color: var(--primary-color);
}

.window-title-text {
    font-size: 13px;
    font-weight: 500;
}

.window-controls {
    display: flex;
    gap: 5px;
}

.window-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-light);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
}

.window-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.window-btn.close:hover {
    background: var(--error-color);
}

.window-body {
    flex: 1;
    overflow: hidden;
    background: var(--window-bg);
}

.window-resize-handle {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 15px;
    height: 15px;
    cursor: se-resize;
}

/* ===== Lock Screen ===== */
#lock-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.lock-screen-content {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.lock-time {
    font-size: 96px;
    font-weight: 200;
    margin-bottom: 10px;
}

.lock-date {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.8;
}

.lock-user {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.lock-user i {
    font-size: 80px;
}

.lock-user span {
    font-size: 24px;
}

.lock-password {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
}

.lock-password input {
    width: 250px;
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 16px;
    text-align: center;
}

.lock-password input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.lock-password input:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.3);
}

.lock-password button {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.lock-password button:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

.lock-hint {
    font-size: 12px;
    opacity: 0.6;
}

/* ===== Shutdown Screen ===== */
#shutdown-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}

.shutdown-content {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.shutdown-content i {
    font-size: 60px;
    margin-bottom: 20px;
    animation: pulse 1s infinite;
}

.shutdown-content h1 {
    font-size: 24px;
    font-weight: 300;
}

/* ===== Scrollbar Styles ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.5);
}

/* ===== Selection ===== */
::selection {
    background: var(--primary-color);
    color: white;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    #sidebar {
        width: 100%;
    }
    
    .desktop-icon {
        width: 70px;
    }
    
    .desktop-icon i {
        font-size: 32px;
    }
    
    #start-menu {
        width: calc(100% - 20px);
        left: 10px;
        right: 10px;
    }
    
    .window {
        min-width: 100%;
        min-height: 50%;
    }
}