:root {
    --bg-dark: #1E1E1E;
    --bg-darker: #181818;
    --bg-panel: #252526;
    --text-main: #CCCCCC;
    --text-muted: #969696;
    --accent: #007ACC;
    --accent-hover: #005999;
    --border: #3C3C3C;
    --error: #F48771;
    --highlight: rgba(255, 255, 0, 0.2);
    --zone-bg: rgba(0, 122, 204, 0.1);
    --font-ui: 'Inter', sans-serif;
    --font-code: 'Fira Code', monospace;
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-darker);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography & General */
h1, h2, h3, h4 { color: #fff; }
.section-title { font-size: 2.2rem; margin-bottom: 2.5rem; text-align: center; }
a { text-decoration: none; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    font-family: var(--font-ui);
}

.btn:active {
    transform: translateY(0);
    box-shadow: none;
}

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero Section */
.hero-full {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(180deg, #111 0%, var(--bg-darker) 100%);
    padding-top: 80px;
}

.hero h1 { font-size: 4.5rem; margin-bottom: 10px; font-weight: 800; background: -webkit-linear-gradient(#fff, #aaa); -webkit-background-clip: text; -webkit-text-fill-color: transparent;}
.hero h2 { font-size: 2rem; color: #ddd; margin-bottom: 20px; font-weight: 600;}
.hero .subtitle { font-size: 1.2rem; color: var(--text-muted); margin: 0 auto 40px; max-width: 700px; }

/* Download Button */
.download-container {
    display: flex;
    justify-content: center;
    margin-bottom: 60px;
}

.btn-download {
    background-color: var(--accent);
    color: #fff;
    border-radius: 8px;
    padding: 14px 28px;
    gap: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    text-align: left;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-download:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 204, 0.4);
}

.btn-text-group {
    display: flex;
    flex-direction: column;
}

.btn-main-text {
    font-size: 1.1rem;
    font-weight: 600;
}

.btn-sub-text {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
    margin-top: 2px;
}

/* Hero Screenshot */
.hero-image-wrapper {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.hero-screenshot {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 24px 80px rgba(0,0,0,0.6);
    border: 1px solid #333;
    display: block;
    margin: 2rem auto 0;
}

/* Demo Section */
.demo-section { padding: 100px 0; }
.section-desc { text-align: center; color: var(--text-muted); margin-bottom: 40px; font-size: 1.1rem; max-width: 800px; margin-left: auto; margin-right: auto; }

.scenario-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.scenario-btn {
    background-color: var(--bg-panel);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 10px 20px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}
.scenario-btn:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}
.scenario-btn.active {
    background-color: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 122, 204, 0.3);
}

/* IDE Mockup */
.ide-mockup {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    height: 700px;
    background-color: var(--bg-dark);
    box-shadow: 0 12px 36px rgba(0,0,0,0.4);
}

.ide-top {
    display: flex;
    flex: 7;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

.ide-left {
    width: 40%;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
}

.ide-right {
    width: 60%;
    display: flex;
    flex-direction: column;
    position: relative;
    background-color: var(--bg-dark);
}

.panel-header, .editor-header, .test-panel-header {
    background-color: var(--bg-panel);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.panel-header {
    padding: 10px 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.problem-content {
    padding: 20px;
    overflow-y: auto;
    font-size: 0.95rem;
}
.problem-content p { margin-bottom: 15px; }

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
}
.tabs { display: flex; }
.tab {
    padding: 10px 20px;
    background-color: var(--bg-dark);
    border-right: 1px solid var(--border);
    border-top: 2px solid var(--accent);
    color: #fff;
    cursor: pointer;
}
.test-panel-header .tab {
    border-top: none;
    background-color: var(--bg-dark);
    border-right: 1px solid var(--border);
    padding: 8px 20px;
    display: inline-block;
    border-top: 1px solid var(--accent);
}

.editor-actions {
    padding-right: 15px;
}
.btn-run {
    background-color: transparent;
    color: var(--text-main);
    padding: 4px 10px;
    font-size: 0.85rem;
    gap: 6px;
}
.btn-run:hover { background-color: rgba(255,255,255,0.1); color: #fff; }

.editor-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    background-color: var(--bg-dark);
    font-family: var(--font-code);
    font-size: 14px;
    line-height: 1.6;
    padding-top: 10px;
}

.code-container {
    display: flex;
    flex-direction: column;
}

.code-line-wrapper {
    display: flex;
    width: 100%;
}

.line-number {
    width: 50px;
    min-width: 50px;
    text-align: right;
    padding-right: 15px;
    color: #858585;
    user-select: none;
}

.line-content {
    flex-grow: 1;
    white-space: pre;
    color: #9CDCFE;
    padding-left: 10px;
}

.keyword { color: #569CD6; }
.type { color: #4EC9B0; }
.string { color: #CE9178; }
.comment { color: #6A9955; }
.function { color: #DCDCAA; }
.number { color: #B5CEA8; }
.operator { color: #D4D4D4; }

.highlight-bg {
    background-color: var(--highlight);
}

.zone-widget {
    width: 100%;
    background-color: var(--zone-bg);
    border-top: 1px solid var(--accent);
    border-bottom: 1px solid var(--accent);
    padding: 10px 40px;
    margin-top: 2px;
    margin-bottom: 2px;
    display: flex;
    overflow: hidden;
    font-family: var(--font-ui);
    color: #fff;
    font-size: 0.95rem;
    animation: slideDown 0.3s ease-out forwards;
}
@keyframes slideDown {
    from { max-height: 0; opacity: 0; padding-top: 0; padding-bottom: 0; border-width: 0; }
    to { max-height: 150px; opacity: 1; padding-top: 10px; padding-bottom: 10px; border-width: 1px; }
}

.zone-content {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.zone-icon svg {
    color: var(--accent);
}

.zone-text {
    line-height: 1.5;
}

/* Test Cases Panel */
.ide-bottom {
    flex: 3;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
}

.test-panel-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    padding: 15px;
    overflow-y: auto;
}

.test-case-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.test-case-tab {
    padding: 6px 12px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    cursor: pointer;
}
.test-case-tab.active {
    background-color: rgba(0, 122, 204, 0.2);
    border-color: var(--accent);
    color: #fff;
}

.test-case-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    flex-grow: 1;
}

.test-col {
    display: flex;
    flex-direction: column;
    background-color: #1e1e1e;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
}

.col-title {
    background-color: var(--bg-panel);
    padding: 6px 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.col-content {
    padding: 10px;
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: var(--text-main);
    flex-grow: 1;
}
.col-content.verdict {
    font-weight: 600;
    display: flex;
    align-items: center;
}
.verdict-wa, .verdict-error { color: var(--error); }
.verdict-tle { color: #DCDCAA; }
.verdict-pending { color: var(--text-muted); font-style: italic; }

/* How it Works */
.how-it-works { padding: 100px 0; }
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.step-card {
    background-color: var(--bg-panel);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s ease;
}
.step-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0, 122, 204, 0.15);
}
.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    background-color: var(--accent);
    border-radius: 50%;
    margin-bottom: 20px;
    font-weight: 800;
}
.step-card h4 { margin-bottom: 15px; }
.step-card p { font-size: 0.95rem; color: var(--text-muted); }

/* Features */
.features-section { padding: 100px 0; background-color: var(--bg-panel); }
.feature-row {
    display: flex;
    align-items: center;
    gap: 60px;
    margin-bottom: 80px;
}
.feature-row.reverse {
    flex-direction: row-reverse;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-text { flex: 1; }
.feature-text h4 { font-size: 1.8rem; margin-bottom: 20px; color: #fff; }
.feature-text p { font-size: 1.1rem; color: var(--text-muted); }
.feature-image { flex: 1; }
.feature-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}
.feature-row:hover .feature-image img {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}
.feature-row:hover .feature-text {
    transform: translateY(-2px);
    transition: transform 0.3s ease;
}

/* Performance */
.performance-section { padding: 100px 0; }
.perf-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.perf-card {
    background-color: var(--bg-dark);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
}
.perf-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0, 122, 204, 0.15);
}
.perf-card h4 { color: var(--accent); margin-bottom: 15px; }

/* Comparison Table */
.comparison-section { padding: 100px 0; }
.table-responsive { overflow-x: auto; }
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-panel);
    border-radius: 8px;
    overflow: hidden;
}
.comparison-table th, .comparison-table td {
    padding: 18px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.comparison-table tbody tr {
    transition: background-color 0.2s ease;
}
.comparison-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.03);
}
.comparison-table th { background-color: #181818; }
.highlight-col { background-color: rgba(0, 122, 204, 0.1); }

/* FAQ */
.faq-section { padding: 100px 0; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { margin-bottom: 30px; border-bottom: 1px solid var(--border); padding-bottom: 20px; }
.faq-question { font-weight: 600; margin-bottom: 10px; color: #fff; }
.faq-answer { font-size: 0.95rem; color: var(--text-muted); }

/* Bottom CTA */
.cta-section {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-darker) 0%, #111 100%);
}
.cta-section .section-title {
    margin-bottom: 2rem;
}

footer {
    text-align: center;
    padding: 30px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
}

/* RWD */
@media (max-width: 900px) {
    .steps-grid, .perf-grid { grid-template-columns: 1fr; }
    .feature-row, .feature-row.reverse { flex-direction: column; text-align: center; }
    .hero h1 { font-size: 3rem; }
}