/* CSS Variables - Dark Mode (Default) */
:root {
    --primary-color: #f57c00;
    --primary-dark: #e65100;
    --primary-light: #ffb74d;
    --bg-dark: #1a1a2e;
    --bg-darker: #0f0f1a;
    --bg-card: #16213e;
    --bg-card-hover: #1f3460;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b80;
    --border-color: #2a2a4a;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.4);
    --taskbar-width: 70px;
    --topbar-height: 40px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --login-bg: rgba(22, 33, 62, 0.8);
    --login-gradient: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 50%, #1a1a3e 100%);
    --desktop-gradient-1: rgba(245, 124, 0, 0.05);
    --desktop-gradient-2: rgba(245, 124, 0, 0.03);
    --icon-hover-bg: rgba(255, 255, 255, 0.05);
    --terminal-bg: #0d1117;
}

/* Light Mode Theme */
body.light-mode {
    --bg-dark: #e8e8f0;
    --bg-darker: #f5f5fa;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f0f5;
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a70;
    --text-muted: #8a8aa0;
    --border-color: #d0d0e0;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.15);
    --login-bg: rgba(255, 255, 255, 0.9);
    --login-gradient: linear-gradient(135deg, #f5f5fa 0%, #e8e8f0 50%, #e0e0f0 100%);
    --desktop-gradient-1: rgba(245, 124, 0, 0.08);
    --desktop-gradient-2: rgba(245, 124, 0, 0.05);
    --icon-hover-bg: rgba(0, 0, 0, 0.05);
    --terminal-bg: #1e1e2e;
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-darker);
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.hidden {
    display: none !important;
}

/* ==================== LOGIN SCREEN ==================== */
.login-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.login-background {
    position: absolute;
    inset: 0;
    background: var(--login-gradient);
    z-index: -1;
    transition: background 0.3s ease;
}

.login-background::before {
    content: "";
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(245, 124, 0, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(245, 124, 0, 0.1) 0%, transparent 50%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 48px 40px;
    background: var(--login-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease-out;
    transition: background 0.3s ease, border-color 0.3s ease;
}

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

.login-logo {
    text-align: center;
    margin-bottom: 40px;
}

.login-logo img {
    height: 60px;
    width: auto;
    filter: drop-shadow(0 4px 12px rgba(245, 124, 0, 0.3));
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    padding: 14px 18px;
    background: var(--bg-darker);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 15px;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(245, 124, 0, 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 124, 0, 0.4);
}

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

.login-btn svg {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.login-btn:hover svg {
    transform: translateX(4px);
}

.login-error {
    color: #ff6b6b;
    font-size: 14px;
    text-align: center;
    min-height: 20px;
}

.login-footer {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 13px;
}

/* ==================== DESKTOP ==================== */
.desktop {
    position: fixed;
    inset: 0;
    display: flex;
    background: var(--bg-darker);
    transition: background 0.3s ease;
}

/* Taskbar (Left Side) */
.taskbar {
    width: var(--taskbar-width);
    height: 100%;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 16px 0;
    z-index: 1000;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.taskbar-top {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.taskbar-logo {
    padding: 12px;
    margin-bottom: 16px;
}

.taskbar-logo img {
    width: 40px;
    height: auto;
}

.taskbar-apps {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    width: 100%;
}

.taskbar-app {
    width: 54px;
    height: 54px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.taskbar-app:hover {
    background: var(--bg-card-hover);
}

.taskbar-app.active {
    background: rgba(245, 124, 0, 0.2);
}

.taskbar-app.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 0 4px 4px 0;
}

.taskbar-app svg {
    width: 26px;
    height: 26px;
    stroke: var(--text-secondary);
    transition: var(--transition);
}

.taskbar-app:hover svg,
.taskbar-app.active svg {
    stroke: var(--primary-color);
}

.taskbar-app .app-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
}

.taskbar-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.taskbar-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.taskbar-btn:hover {
    background: var(--bg-card-hover);
}

.taskbar-btn svg {
    width: 22px;
    height: 22px;
    stroke: var(--text-secondary);
    transition: var(--transition);
}

.taskbar-btn:hover svg {
    stroke: var(--text-primary);
}

#logout-btn:hover svg {
    stroke: #ff6b6b;
}

/* Desktop Area */
.desktop-area {
    flex: 1;
    position: relative;
    margin-top: var(--topbar-height);
    overflow: hidden;
    background: 
        radial-gradient(ellipse at 30% 70%, var(--desktop-gradient-1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 30%, var(--desktop-gradient-2) 0%, transparent 50%),
        var(--bg-darker);
    transition: background 0.3s ease;
}

/* Top Bar */
.topbar {
    position: fixed;
    top: 0;
    left: var(--taskbar-width);
    right: 0;
    height: var(--topbar-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 999;
    transition: background 0.3s ease, border-color 0.3s ease;
}

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

.topbar-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.topbar-date,
.topbar-time {
    font-size: 13px;
    color: var(--text-secondary);
}

.topbar-time {
    font-weight: 600;
    color: var(--text-primary);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: var(--bg-darker);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.topbar-user:hover {
    background: var(--bg-card-hover);
}

.topbar-user svg {
    width: 18px;
    height: 18px;
    stroke: var(--primary-color);
}

.topbar-user span {
    font-size: 13px;
    font-weight: 500;
}

/* Desktop Icons */
.desktop-icons {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 24px;
}

.desktop-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.desktop-icon:hover {
    background: var(--icon-hover-bg);
}

.desktop-icon-img {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.desktop-icon-img svg {
    width: 26px;
    height: 26px;
    stroke: var(--primary-color);
}

.desktop-icon-label {
    font-size: 12px;
    color: var(--text-primary);
    text-align: center;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Light mode: remove text shadow on desktop icons */
body.light-mode .desktop-icon-label {
    text-shadow: none;
}

body.dark-mode .desktop-icon-label {
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* ==================== WINDOWS ==================== */
.windows-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.window {
    position: absolute;
    min-width: 400px;
    min-height: 300px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    pointer-events: all;
    overflow: hidden;
    animation: windowOpen 0.2s ease-out;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

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

.window.maximized {
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    border-radius: 0;
}

.window.minimized {
    display: none;
}

.window-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-darker);
    border-bottom: 1px solid var(--border-color);
    cursor: move;
    user-select: none;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.window-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
}

.window-title svg {
    width: 18px;
    height: 18px;
    stroke: var(--primary-color);
}

.window-controls {
    display: flex;
    gap: 8px;
}

.window-control {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.window-control:hover {
    background: var(--bg-card-hover);
}

.window-control svg {
    width: 14px;
    height: 14px;
    stroke: var(--text-secondary);
}

.window-control.close:hover {
    background: #ff4757;
}

.window-control.close:hover svg {
    stroke: white;
}

.window-content {
    flex: 1;
    overflow: auto;
    padding: 20px;
}

.window-resize {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 20px;
    height: 20px;
    cursor: se-resize;
}

/* ==================== APP-SPECIFIC STYLES ==================== */

/* Welcome App */
.welcome-content {
    text-align: center;
    padding: 40px;
}

.welcome-content h2 {
    font-size: 28px;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.welcome-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.welcome-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.stat-card {
    padding: 20px;
    background: var(--bg-darker);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.stat-card h3 {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-card p {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0;
}

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

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}