:root {
    /* Swiss Design System Colors - Light Mode */
    --bg-color: #F8FAFC;
    --text-color: #0F172A;
    --text-muted: #64748B;
    --card-bg: #FFFFFF;
    --border-color: #E2E8F0;
    --primary-color: #2563EB;
    --primary-hover: #1D4ED8;
    --nav-bg: rgba(248, 250, 252, 0.95);
    --status-green: #10B981;
    --status-green-bg: rgba(16, 185, 129, 0.1);
    --status-red: #EF4444;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 4px; /* Crisp, professional corners */
}

[data-theme="dark"] {
    /* Dark Mode Mapping */
    --bg-color: #0F172A;
    --text-color: #F8FAFC;
    --text-muted: #94A3B8;
    --card-bg: #1E293B;
    --border-color: #334155;
    --primary-color: #3B82F6;
    --primary-hover: #60A5FA;
    --nav-bg: rgba(15, 23, 42, 0.95);
    --status-green-bg: rgba(16, 185, 129, 0.15);
}

html {
    scroll-behavior: smooth;
}

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

@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pageFadeOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-8px); }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    -webkit-font-smoothing: antialiased;
    animation: pageFadeIn 0.4s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

a {
    text-decoration: none;
    color: var(--primary-color);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.uptime-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--status-green);
    background-color: var(--status-green-bg);
    padding: 4px 12px;
    border-radius: 9999px;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-dot {
    width: 6px;
    height: 6px;
    background-color: var(--status-green);
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--status-green-bg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 4px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

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

.nav-links a {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--text-color);
    border-color: var(--text-muted);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.btn-portal {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
}

.btn-portal:hover {
    background-color: var(--card-bg);
    border-color: var(--text-color);
}

/* Hero Section */
.hero {
    padding: 160px 0 100px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -1px;
    color: var(--text-color);
}

.hero-content p {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: #FFFFFF !important;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
}

.cta-btn:hover {
    background-color: var(--primary-hover);
}

/* Interactive Widget */
.widget-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
    position: relative;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
}

.widget-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.widget-status {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    background-color: var(--status-green-bg);
    color: var(--status-green);
    transition: var(--transition);
}

.widget-status.blocked {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--status-red);
}

.widget-canvas {
    height: 180px;
    position: relative;
    margin-bottom: 24px;
}

.node {
    position: absolute;
    width: 48px;
    height: 48px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    color: var(--text-color);
}

.node-client { top: 66px; left: 0; }
.node-router { top: 66px; left: 120px; }
.node-server-a { top: 0; right: 0; border-color: var(--primary-color); }
.node-server-b { top: 132px; right: 0; }

.node svg { width: 24px; height: 24px; stroke: currentColor; stroke-width: 1.5; fill: none; }

.path-line {
    position: absolute;
    z-index: 1;
    border-top: 2px dashed var(--border-color);
}

.path-1 { top: 89px; left: 48px; width: 72px; }
.path-2 { top: 23px; left: 168px; width: 140px; transform-origin: left; transform: rotate(-25deg); border-color: var(--primary-color); }
.path-3 { top: 155px; left: 168px; width: 140px; transform-origin: left; transform: rotate(25deg); }

.packet {
    position: absolute;
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%;
    z-index: 3;
    opacity: 0;
}

.btn-simulate {
    width: 100%;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Sections */
section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    margin-bottom: 48px;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* Grid & Cards */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

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

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 32px;
}

.icon-wrapper {
    width: 48px;
    height: 48px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary-color);
}

.icon-wrapper svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-color);
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Server Matrix */
.matrix-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.matrix-table th, .matrix-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.matrix-table th {
    background-color: var(--bg-color);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.matrix-table tr:last-child td {
    border-bottom: none;
}

.matrix-table td {
    font-size: 0.875rem;
    font-weight: 500;
}

.metric-bar {
    width: 100px;
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    display: inline-block;
    vertical-align: middle;
    margin-right: 12px;
}

.metric-fill {
    height: 100%;
    background-color: var(--status-green);
}

.metric-fill.warning { background-color: #F59E0B; }

/* Pricing */
.pricing-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
}

.billing-toggle {
    display: flex;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    padding: 4px;
    position: relative;
    cursor: pointer;
}

.billing-option {
    padding: 6px 16px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: 9999px;
    position: relative;
    z-index: 2;
    transition: color 0.3s;
}

.billing-option.active {
    color: var(--text-color);
}

.billing-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    z-index: 1;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.save-badge {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
}

.pricing-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
}

.pricing-card.premium {
    border-color: var(--primary-color);
    position: relative;
}

.pricing-card.premium::before {
    content: 'RECOMMENDED';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: #FFFFFF;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 9999px;
    letter-spacing: 1px;
}

.plan-name {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.plan-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: -1px;
    margin-bottom: 24px;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.plan-price .price-val {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-color);
    line-height: 1;
}

.plan-price .price-period {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
}

.plan-features {
    list-style: none;
    margin-bottom: 32px;
    flex-grow: 1;
}

.plan-features li {
    font-size: 0.875rem;
    color: var(--text-muted);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.plan-features li svg {
    width: 16px;
    height: 16px;
    stroke: var(--primary-color);
    stroke-width: 2;
    fill: none;
}

.plan-features li:last-child {
    border-bottom: none;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 12px 0;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
}

.btn-block:hover {
    border-color: var(--text-color);
}

.pricing-card.premium .btn-block {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border-color: var(--primary-color);
}

.pricing-card.premium .btn-block:hover {
    background-color: var(--primary-hover);
}

/* FAQ */
.faq-list {
    max-width: 800px;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 24px 0;
}

.faq-item:first-child {
    border-top: 1px solid var(--border-color);
}

.faq-q {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.faq-a {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 64px 0 32px;
    background-color: var(--bg-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

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

.copyright {
    color: var(--text-muted);
    font-size: 0.75rem;
    text-align: left;
    border-top: 1px solid var(--border-color);
    padding-top: 32px;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero { grid-template-columns: 1fr; text-align: center; }
    .hero-content p { margin: 0 auto 40px; }
    .nav-links { display: none; }
}

@media (max-width: 768px) {
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .matrix-table { display: block; overflow-x: auto; }
    .footer-content { flex-direction: column; gap: 24px; text-align: center; }
    .footer-links { flex-wrap: wrap; justify-content: center; }
}

/* SEO Article Styles */
.seo-article { line-height: 1.8; color: var(--text-color); }
.seo-article h1 { font-size: 2.2rem; margin-bottom: 16px; line-height: 1.3; font-weight: 800; letter-spacing: -0.5px;}
.article-meta { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 32px; border-bottom: 1px solid var(--border-color); padding-bottom: 16px; }
.toc { background-color: var(--card-bg); border: 1px solid var(--border-color); padding: 24px; border-radius: var(--radius); margin-bottom: 40px; box-shadow: 0 2px 4px rgba(0,0,0,0.02);}
.toc h2 { margin-bottom: 16px; margin-top: 0; font-size: 1.25rem; font-weight: 700;}
.toc ul { list-style: none; padding-left: 0; margin-bottom: 0;}
.toc li { margin-bottom: 10px; }
.toc li:last-child { margin-bottom: 0; }
.toc a { color: var(--primary-color); font-weight: 600; font-size: 0.95rem; }
.toc a:hover { text-decoration: underline; }
.seo-article h2 { font-size: 1.75rem; margin: 48px 0 24px; color: var(--text-color); border-bottom: 1px solid var(--border-color); padding-bottom: 8px;}
.seo-article h3 { font-size: 1.3rem; margin: 32px 0 16px; font-weight: 700; color: var(--text-color);}
.seo-article p { margin-bottom: 20px; font-size: 1.05rem; color: var(--text-color); }
.seo-article ul, .seo-article ol { margin-bottom: 24px; padding-left: 24px; color: var(--text-color); }
.seo-article li { margin-bottom: 8px; font-size: 1.05rem; }
.related-links { list-style: circle; padding-left: 24px; }
.related-links a { font-weight: 600; }
.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 32px; margin-top: 40px; }
.news-card { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 24px; transition: var(--transition); display: flex; flex-direction: column; }
.news-card:hover { border-color: var(--primary-color); transform: translateY(-3px); box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05); }
.news-card .date { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 12px; }
.news-card h3 { font-size: 1.2rem; margin-bottom: 12px; color: var(--text-color); line-height: 1.4; }
.news-card p { font-size: 0.95rem; color: var(--text-muted); flex-grow: 1; margin-bottom: 24px; }
.news-card .read-more { font-size: 0.875rem; font-weight: 600; color: var(--primary-color); }

/* Click / Active Transitions */
a, button, .card, .pricing-card, .news-card, .billing-toggle {
    -webkit-tap-highlight-color: transparent;
}
.cta-btn:active, .btn-portal:active, .btn-block:active, .btn-simulate:active, .theme-toggle:active, .billing-toggle:active {
    transform: scale(0.96);
    transition: transform 0.1s ease-out !important;
}
.card:active, .pricing-card:active, .news-card:active {
    transform: scale(0.98);
    transition: transform 0.1s ease-out !important;
}

/* Hover Transitions for Cards */
.card, .pricing-card {
    transition: var(--transition);
}
.card:hover, .pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(0,0,0,0.08);
    border-color: var(--primary-color);
}
[data-theme="dark"] .card:hover, [data-theme="dark"] .pricing-card:hover {
    box-shadow: 0 16px 32px rgba(0,0,0,0.4);
}