:root {
    --bg-color: #ffffff;
    --surface: #ffffff;
    /* Added surface */
    --text-color: #111111;
    --accent-color: #000000;
    --border-color: #e5e5e5;
    --code-bg: #e8e8e8;
    /* Darker grey for light mode contrast */
    --code-text: #000000;
    --demo-bg: #fafafa;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html.dark body {
    --bg-color: #0a0a0a;
    --surface: #111111;
    /* Added surface */
    --text-color: #ededed;
    --accent-color: #ffffff;
    --border-color: #333333;
    --code-bg: #161616;
    --code-text: #e1e4e8;
    --demo-bg: #111111;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 80px 24px;
}

header {
    margin-bottom: 80px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.version {
    display: inline-block;
    background: var(--text-color);
    color: var(--bg-color);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 99px;
    vertical-align: middle;
    margin-left: 12px;
}

.subtitle {
    font-size: 1.125rem;
    color: #666;
    max-width: 480px;
}

section {
    margin-bottom: 64px;
}

.feature {
    margin-bottom: 64px;
}

.feature-header {
    margin-bottom: 24px;
}

h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

p {
    color: #666;
    font-size: 0.95rem;
}

.demo-box {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 32px;
    background: var(--demo-bg);
    transition: all 0.2s ease;
}

.demo-box:focus-within {
    border-color: var(--accent-color);
    background: var(--bg-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.input-group {
    margin-bottom: 0;
}

label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #888;
    margin-bottom: 12px;
}

input {
    width: 100%;
    padding: 12px 0;
    font-size: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    /* Monospace for data entry feel */
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-color);
    border-radius: 0;
    transition: border-color 0.2s ease;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
}

input::placeholder {
    color: #777;
}

/* Code Snippet Styling */
/* Code Snippet Styling */
.code-snippet {
    margin-top: 24px;
    background: var(--code-bg);
    padding: 16px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-color);
    overflow-x: auto;
    border: 1px solid transparent;
}

.attr {
    color: #d00000;
    /* Darker red */
}

.val {
    color: #0044cc;
    /* Brighter blue */
}

.tag {
    color: #006600;
    /* Standard green */
}

/* Dark mode overrides for code highlighting */
.dark .attr {
    color: #ff7b72;
}

.dark .val {
    color: #a5d6ff;
}

.dark .tag {
    color: #7ee787;
}

.dark .subtitle {
    color: #aaa;
}

.dark p {
    color: #bbb;
}

footer {
    margin-top: 120px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: #888;
    display: flex;
    justify-content: space-between;
}

a {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
}

a:hover {
    border-bottom-color: var(--accent-color);
}

/* Specific demo adjustments */
input[data-pass] {
    transition: border-color 0.3s ease;
}

/* Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

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

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Hide/Show icons based on theme */
html.dark .icon-moon {
    display: none;
}

html.dark .icon-sun {
    display: block;
}

html:not(.dark) .icon-sun {
    display: none;
}

html:not(.dark) .icon-moon {
    display: block;
}

/* Version Nav & Download */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 8px;
}

.controls-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px;
    margin-top: 24px;
}

.version-toggle-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.download-container {
    display: flex;
    gap: 10px;
}

/* Search Bar */
.search-container {
    margin-top: 24px;
    position: relative;
    max-width: 100%;
}

.search-input {
    width: 100%;
}

#feature-search {
    width: 100%;
    padding: 12px 16px 12px 42px;
    /* Left padding for icon */
    font-size: 0.95rem;
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    transition: all 0.2s ease;
    font-family: var(--font-main);
}

#feature-search:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
    pointer-events: none;
}

.hidden-search {
    display: none !important;
}

.nav-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
}

.version-link {
    font-size: 0.85rem;
    color: #666;
    border-bottom: 1px solid var(--border-color);
}

.version-link:hover {
    color: var(--text-color);
    border-bottom-color: var(--text-color);
}

.current-ver {
    font-size: 0.85rem;
    font-weight: 600;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-color);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all 0.2s ease;
    text-decoration: none;
    border-bottom: 1px solid var(--border-color);
    /* Override default link border */
}


/* Segmented Control & Badges */
.toggle-label {
    font-size: 0.85em;
    color: #999;
    font-weight: 500;
}

.segmented-control {
    background: var(--surface);
    /* Fallback */
    background: rgba(0, 0, 0, 0.05);
    /* Light bg */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 4px;
    display: inline-flex;
    gap: 4px;
}

.dark .segmented-control {
    background: rgba(255, 255, 255, 0.05);
}

.seg-btn {
    background: transparent;
    border: none;
    color: #666;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.seg-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}

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

.seg-btn.active {
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.seg-btn.active[data-value="1.4.0"] {
    background-color: #0070f3;
}

.seg-btn.active[data-value="1.3.0"] {
    background-color: #f57c00;
}

.badge-new,
.badge-legacy {
    font-size: 0.7em;
    padding: 2px 5px;
    border-radius: 4px;
    text-transform: uppercase;
}

.badge-new {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.badge-legacy {
    background: rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.9);
}

/* Banner */
#v1-3-banner {
    display: none;
    background: rgba(255, 152, 0, 0.1);
    color: #bd7306;
    border: 1px solid rgba(255, 152, 0, 0.3);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 30px;
    font-size: 0.9em;
    align-items: center;
    gap: 10px;
}

html.dark #v1-3-banner {
    background: rgba(255, 152, 0, 0.15);
    color: #ffb74d;
}

/* Download Buttons overrides */
.btn-download.primary {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

.btn-download.secondary {
    background: transparent;
    color: var(--text-color);
}

/* Mobile Responsive */
@media (max-width: 600px) {
    .controls-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .version-toggle-container,
    .download-container {
        width: 100%;
        justify-content: flex-start;
    }

    .segmented-control {
        width: 100%;
    }

    .seg-btn {
        flex: 1;
        justify-content: center;
    }
}