/* Base CSS Variables for Theming */
:root {
    /* Default Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --text-primary: #333333;
    --text-secondary: #666666;
    --accent-color: #4285f4;
    --card-bg: #ffffff;
    --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --toggle-bg: #e0e0e0;
    --toggle-button: #ffffff;
    
    /* Animation Duration */
    --transition-speed: 0.3s;
}

/* Light Theme Variants */
[data-theme="light-sepia"] {
    --bg-primary: #f8f1e3;
    --bg-secondary: #f0e6d2;
    --text-primary: #5c4b35;
    --text-secondary: #8a7a64;
    --card-bg: #fffaf0;
}

[data-theme="light-cool"] {
    --bg-primary: #f0f4f8;
    --bg-secondary: #e1e8ed;
    --text-primary: #2c3e50;
    --text-secondary: #546e7a;
    --card-bg: #f5f9fc;
}

/* Dark Theme Base */
[data-theme="dark-default"] {
    --bg-primary: #1f1f1f;
    --bg-secondary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --card-bg: #2d2d2d;
    --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --toggle-bg: #555555;
    --toggle-button: #1f1f1f;
}

/* Dark Theme Variants */
[data-theme="dark-oled"] {
    --bg-primary: #000000;
    --bg-secondary: #121212;
    --text-primary: #ffffff;
    --text-secondary: #bbbbbb;
    --card-bg: #121212;
}

[data-theme="dark-blue"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --card-bg: #161b22;
}

/* Accent Colors */
[data-accent="blue"] {
    --accent-color: #4285f4;
}

[data-accent="green"] {
    --accent-color: #34a853;
}

[data-accent="yellow"] {
    --accent-color: #fbbc05;
}

[data-accent="red"] {
    --accent-color: #ea4335;
}

[data-accent="purple"] {
    --accent-color: #9c27b0;
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color var(--transition-speed) ease, 
                color var(--transition-speed) ease,
                border-color var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-secondary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.theme-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Toggle Switch Styles */
.theme-toggle-container {
    position: relative;
}

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    width: 60px;
    height: 30px;
    outline: none;
}

.toggle-track {
    position: relative;
    display: block;
    width: 100%;
    height: 100%;
    background-color: var(--toggle-bg);
    border-radius: 15px;
    overflow: hidden;
}

.toggle-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all 0.4s ease;
}

.toggle-icon-light {
    left: 5px;
    opacity: 1;
    color: #fbbc05;
}

.toggle-icon-dark {
    right: 5px;
    opacity: 0.5;
    color: #c9d1d9;
}

/* Toggle Animation */
[data-theme*="dark"] .toggle-icon-light {
    opacity: 0.5;
}

[data-theme*="dark"] .toggle-icon-dark {
    opacity: 1;
}

/* Theme Selector Styles */
.theme-selector {
    position: relative;
}

#theme-options-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s ease;
}

#theme-options-toggle:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

.theme-options {
    position: absolute;
    top: 100%;
    right: 0;
    width: 250px;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    padding: 1rem;
    margin-top: 0.5rem;
    z-index: 10;
    display: none;
}

.theme-options.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

.theme-option-group, .accent-option-group {
    margin-bottom: 1rem;
}

.theme-option-group h3, .accent-option-group h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.theme-option {
    background: none;
    border: 1px solid var(--text-secondary);
    border-radius: 4px;
    padding: 0.3rem 0.6rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.theme-option:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

.theme-option.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.accent-options {
    display: flex;
    gap: 0.5rem;
}

.accent-option {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
}

.accent-option.active {
    border-color: var(--text-primary);
}

/* Main Content Styles */
main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.feature-card h2 {
    margin-bottom: 1rem;
}

/* Content Section */
.content {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 2rem;
}

.content h2 {
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.content p {
    margin-bottom: 1rem;
}

.demo-text {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--text-secondary);
}

.demo-text h3 {
    margin-bottom: 1rem;
}

blockquote {
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
}

pre {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin: 1rem 0;
}

code {
    font-family: 'Courier New', Courier, monospace;
}

/* Footer Styles */
footer {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    margin-top: auto;
}

/* Theme Notification */
.theme-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--card-bg);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 1000;
}

.theme-notification.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

#notification-undo {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
}

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

@keyframes sunRise {
    0% {
        transform: translateY(20px) scale(0.8);
        opacity: 0;
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes moonRise {
    0% {
        transform: translateY(20px) scale(0.8);
        opacity: 0;
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

/* Apply sun/moon animations when theme changes */
[data-theme*="light"] .toggle-icon-light i {
    animation: sunRise 0.5s ease forwards;
}

[data-theme*="dark"] .toggle-icon-dark i {
    animation: moonRise 0.5s ease forwards;
}

/* Responsive Styles */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .theme-options {
        width: 220px;
    }
}

/* High Contrast Mode for Accessibility */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #333333;
        --accent-color: #0000ff;
    }
    
    [data-theme*="dark"] {
        --text-primary: #ffffff;
        --text-secondary: #dddddd;
        --accent-color: #ffff00;
    }
}