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

:root {
    /* Light theme (default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-card: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --border-color: #e5e7eb;
    --hover-bg: #f3f4f6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #2a2a2a;
    --hover-bg: #252525;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

[data-theme="dark"] .nav {
    background-color: rgba(10, 10, 10, 0.8);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    filter: brightness(0) saturate(100%);
    transition: filter 0.2s;
}

[data-theme="dark"] .logo-icon {
    filter: brightness(0) saturate(100%) invert(100%);
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white !important;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 500;
}

/* Dark Mode Toggle */
.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    width: 40px;
    height: 40px;
}

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

.theme-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.theme-toggle:hover svg {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 160px 0 120px;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1200px;
    height: 800px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.btn {
    padding: 14px 28px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.2s;
    display: inline-block;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Hero Visual - IDE Mockup */
.hero-visual {
    position: relative;
}

.ide-mockup {
    perspective: 1200px;
}

.ide-window {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: rotateY(-3deg) rotateX(3deg);
    transition: transform 0.3s ease;
}

.ide-window:hover {
    transform: rotateY(0deg) rotateX(0deg);
}

/* IDE Header */
.ide-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.header-logo {
    width: 24px;
    height: 24px;
}

.header-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
}

.version-badge {
    font-size: 11px;
    color: var(--text-secondary);
    background: var(--bg-card);
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    font-weight: 500;
}

/* IDE Main Layout */
.ide-main {
    display: grid;
    grid-template-columns: 48px 200px 1fr;
    height: 450px;
}

/* Left Icon Panel */
.ide-left-panel {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 0;
    gap: 8px;
}

.icon-button {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.icon-button:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.icon-button.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.spacer {
    flex: 1;
    min-height: 20px;
}

.ide-left-panel > .icon-button:last-child {
    margin-bottom: 32px;
}

/* Catalog Panel */
.catalog-panel {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.catalog-header {
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

.catalog-tree {
    padding: 8px 0;
    overflow-y: auto;
}

.tree-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.tree-item:hover {
    background: var(--hover-bg);
}

.tree-item.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.tree-item.nested {
    padding-left: 32px;
}

.tree-item.nested-2 {
    padding-left: 52px;
    font-size: 0.9em;
    opacity: 0.85;
}

.tree-item.nested-3 {
    padding-left: 72px;
    font-size: 0.85em;
    opacity: 0.75;
}

.tree-item svg {
    opacity: 0.7;
    flex-shrink: 0;
}

/* Editor Area */
.editor-area {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
}

.query-tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 12px 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.query-tab {
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    background: transparent;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.query-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

.tab-close {
    opacity: 0.5;
    font-size: 16px;
    line-height: 1;
    transition: opacity 0.2s;
}

.tab-close:hover {
    opacity: 1;
}

.tab-add {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.tab-add:hover {
    background: var(--hover-bg);
}

.editor-toolbar {
    padding: 8px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-card);
}

.lang-toggle {
    display: flex;
    gap: 2px;
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 2px;
}

.lang-btn {
    padding: 4px 12px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

.lang-btn.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

.run-btn {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.run-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.code-editor {
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    padding: 12px 0;
    overflow-y: auto;
    max-height: 150px;
}

/* Results Section */
.results-section {
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px 0;
    background: var(--bg-secondary);
}

.result-tab {
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    background: transparent;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 1px solid var(--border-color);
}

.result-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
    border-bottom: 1px solid var(--bg-card);
}

.save-table-btn {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: white;
    border: none;
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.save-table-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.results-grid {
    flex: 1;
    overflow: auto;
    padding: 12px;
    border-top: 1px solid var(--border-color);
}

/* Thin black scrollbar styling */
.results-grid::-webkit-scrollbar,
.code-editor::-webkit-scrollbar,
.catalog-tree::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.results-grid::-webkit-scrollbar-track,
.code-editor::-webkit-scrollbar-track,
.catalog-tree::-webkit-scrollbar-track {
    background: transparent;
}

.results-grid::-webkit-scrollbar-thumb,
.code-editor::-webkit-scrollbar-thumb,
.catalog-tree::-webkit-scrollbar-thumb {
    background: #000000;
    border-radius: 3px;
}

.results-grid::-webkit-scrollbar-thumb:hover,
.code-editor::-webkit-scrollbar-thumb:hover,
.catalog-tree::-webkit-scrollbar-thumb:hover {
    background: #333333;
}

[data-theme="dark"] .results-grid::-webkit-scrollbar-thumb,
[data-theme="dark"] .code-editor::-webkit-scrollbar-thumb,
[data-theme="dark"] .catalog-tree::-webkit-scrollbar-thumb {
    background: #666666;
}

[data-theme="dark"] .results-grid::-webkit-scrollbar-thumb:hover,
[data-theme="dark"] .code-editor::-webkit-scrollbar-thumb:hover,
[data-theme="dark"] .catalog-tree::-webkit-scrollbar-thumb:hover {
    background: #888888;
}

.results-grid table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.results-grid th {
    text-align: left;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
    position: sticky;
    top: 0;
}

.results-grid td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.results-grid tbody tr:hover {
    background: var(--hover-bg);
}

.results-footer {
    padding: 6px 12px;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.code-line {
    padding: 0 16px;
    display: flex;
    gap: 0;
}

.line-num {
    color: var(--text-muted);
    user-select: none;
    min-width: 24px;
    text-align: right;
}

.keyword {
    color: #af00db;
    font-weight: 600;
}

.function {
    color: #795e26;
}

.variable {
    color: #001080;
}

.string {
    color: #a31515;
}

.comment {
    color: #6a9955;
    font-style: italic;
}

[data-theme="dark"] .keyword {
    color: #c586c0;
}

[data-theme="dark"] .function {
    color: #dcdcaa;
}

[data-theme="dark"] .variable {
    color: #9cdcfe;
}

[data-theme="dark"] .string {
    color: #ce9178;
}

[data-theme="dark"] .comment {
    color: #6a9955;
}

/* Sections */
.section {
    padding: 120px 0;
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 48px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 64px;
}

/* Problem Section */
.problem {
    background: var(--bg-secondary);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 64px;
}

.problem-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s;
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.problem-icon {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.problem-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.problem-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Solution Section */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 48px;
    margin-top: 64px;
}

.solution-item {
    position: relative;
}

.solution-number {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-blue);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.solution-item h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 12px;
}

.solution-item p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.code-example {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 14px;
}

.code-example code {
    color: var(--accent-blue);
}

/* Features Section */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 64px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
    border-radius: 12px;
    margin-bottom: 20px;
    color: var(--accent-blue);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

/* Download Section */
.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 64px;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.download-card h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
}

.download-card > p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.download-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: all 0.3s;
}

.download-btn:hover {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-2px);
}

.download-btn svg {
    width: 32px;
    height: 32px;
    color: var(--accent-blue);
}

.download-title {
    font-size: 18px;
    font-weight: 600;
}

.download-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
}

.download-note {
    color: var(--text-muted);
    font-size: 14px;
}

/* Contact Section */
.contact {
    background: var(--bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 64px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.contact-card:hover {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-4px);
}

.contact-card svg {
    color: var(--accent-blue);
}

.contact-card h3 {
    font-size: 20px;
    font-weight: 600;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 64px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 80px;
    margin-bottom: 48px;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-description {
    color: var(--text-secondary);
    font-size: 15px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 12px;
    font-size: 15px;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-title {
        font-size: 48px;
    }

    .hero-visual {
        order: -1;
    }

    .problem-grid,
    .solution-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .nav-links {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 32px;
    }

    .section-subtitle {
        font-size: 18px;
    }

    .download-card {
        padding: 40px 24px;
    }

    .download-card h2 {
        font-size: 28px;
    }
}

/* Smooth Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.hero-visual {
    animation: fadeInUp 0.8s ease-out;
}

/* Selection */
::selection {
    background: rgba(59, 130, 246, 0.3);
    color: white;
}