/* CSS Variables */
:root {
    --primary-color: #0078D7;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --text-primary: #222222;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #e0e0e0;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --sidebar-width: 280px;
    --header-height: 60px;
    --footer-height: 40px;
    --transition-speed: 0.3s;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    --border-color: #404040;
    --shadow-light: rgba(0, 0, 0, 0.2);
    --shadow-medium: rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(245, 245, 245, 0.9);
    transition: background-color var(--transition-speed);
}

[data-theme="dark"] .header {
    background-color: rgba(45, 45, 45, 0.9);
}

.header-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
    flex: 1;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: all var(--transition-speed);
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    transition: background-color var(--transition-speed);
    color: var(--text-primary);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
}

.sun-icon, .moon-icon {
    transition: opacity var(--transition-speed);
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .moon-icon {
    display: none;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height) - var(--footer-height));
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    transition: transform var(--transition-speed);
    z-index: 999;
}

.sidebar-content {
    padding: 20px;
}

/* DealeGear Button */
.dealegear-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    margin-bottom: 24px;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.dealegear-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-medium);
}

/* Language Selector */
.language-selector {
    margin-bottom: 24px;
}

.language-selector label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.language-selector select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: border-color var(--transition-speed);
}

.language-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Navigation Menu */
.nav-menu ul {
    list-style: none;
}

.nav-item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: none;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: left;
}

.nav-item:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(4px);
}

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

.nav-item svg {
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    margin-bottom: var(--footer-height);
    min-height: calc(100vh - var(--header-height) - var(--footer-height));
    transition: margin-left var(--transition-speed);
}

.content-wrapper {
    padding: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.content {
    animation: fadeIn 0.5s ease-in-out;
}

.content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

.content-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.content-text p {
    margin-bottom: 16px;
}

.content-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 24px 0 12px;
    color: var(--text-primary);
}

.content-text ul {
    margin: 16px 0;
    padding-left: 24px;
}

.content-text li {
    margin-bottom: 8px;
}

.content-text code {
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
}

/* Custom Scrollbar */
.sidebar::-webkit-scrollbar,
.content-text::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track,
.content-text::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.sidebar::-webkit-scrollbar-thumb,
.content-text::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.content-text::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--footer-height);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 998;
}

.footer-link {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-speed);
}

.footer-link:hover {
    color: var(--primary-color);
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility var(--transition-speed);
    z-index: 997;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .content-wrapper {
        padding: 20px;
    }

    .content h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 1.25rem;
    }

    .content-wrapper {
        padding: 16px;
    }

    .content h2 {
        font-size: 1.25rem;
    }
}