/* Flat Vector Illustration Style (Corporate Memphis / Modern Flat) */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;600;800&family=Noto+Sans+SC:wght@400;700;900&display=swap');

:root {
    --flat-bg: #F4F7F6;
    --flat-text: #1E1E2F;
    --flat-primary: #4353FF;
    --flat-secondary: #FF6B6B;
    --flat-accent: #FFD93D;
    --flat-green: #00C896;
    --flat-white: #FFFFFF;
    
    --font-head: 'Outfit', 'Noto Sans SC', sans-serif;
    --font-body: 'Outfit', 'Noto Sans SC', sans-serif;
}

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

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

h1, h2, h3, h4 {
    font-family: var(--font-head);
    font-weight: 800;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Floating Pill Navigation */
.nav-wrapper {
    position: fixed;
    top: 20px;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
}
.pill-nav {
    background: var(--flat-white);
    padding: 12px 32px;
    border-radius: 100px;
    display: flex;
    align-items: center;
    gap: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.nav-brand {
    font-size: 24px;
    font-weight: 900;
    color: var(--flat-primary);
    letter-spacing: -1px;
}
.nav-links {
    display: flex;
    gap: 24px;
}
.nav-links a {
    font-weight: 600;
    font-size: 16px;
    color: var(--flat-text);
    transition: color 0.3s;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--flat-secondary);
}
.nav-tools {
    display: flex;
    align-items: center;
    gap: 16px;
}
.lang-tag {
    background: var(--flat-bg);
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
}

/* Buttons */
.btn-flat {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 100px;
    font-weight: 800;
    font-size: 16px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
}
.btn-flat:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}
.btn-primary {
    background: var(--flat-primary);
    color: var(--flat-white);
}
.btn-secondary {
    background: var(--flat-accent);
    color: var(--flat-text);
}

/* Hero Section - Centered with Blob */
.hero-section {
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
}
.hero-content {
    max-width: 800px;
    margin: 0 auto 60px;
}
.hero-title {
    font-size: 72px;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
}
.hero-title span {
    color: var(--flat-secondary);
    position: relative;
    display: inline-block;
}
.hero-title span::after {
    content: '';
    position: absolute;
    bottom: 8px; left: 0; width: 100%; height: 12px;
    background: var(--flat-accent);
    z-index: -1;
    border-radius: 10px;
}
.hero-desc {
    font-size: 20px;
    color: #555;
    margin-bottom: 40px;
}
.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}
.trust-tags {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}
.trust-tags span {
    background: var(--flat-white);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    color: var(--flat-green);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.hero-visual {
    display: flex;
    justify-content: center;
}
.blob-img {
    width: 100%;
    max-width: 800px;
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
    overflow: hidden;
    animation: blob-anim 8s ease-in-out infinite alternate;
    box-shadow: 0 20px 40px rgba(67, 83, 255, 0.15);
}
@keyframes blob-anim {
    0% { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
    100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
}

/* Metrics - Infinite Marquee Ticker */
.metrics-ticker {
    background: var(--flat-primary);
    color: var(--flat-white);
    padding: 30px 0;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    transform: rotate(-2deg);
    margin: 40px -20px;
    width: calc(100% + 40px);
}
.ticker-track {
    display: inline-block;
    animation: ticker 20s linear infinite;
}
.ticker-item {
    display: inline-block;
    font-size: 32px;
    font-weight: 800;
    margin: 0 40px;
}
.ticker-item span {
    color: var(--flat-accent);
}
@keyframes ticker {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Features - Sticky Stacking Cards */
.features-section {
    padding: 100px 0;
}
.sec-header {
    text-align: center;
    margin-bottom: 60px;
}
.sec-title {
    font-size: 48px;
    margin-bottom: 16px;
}
.sticky-stack {
    position: relative;
}
.sticky-card {
    position: sticky;
    top: 120px;
    background: var(--flat-white);
    border-radius: 40px;
    padding: 60px;
    margin-bottom: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    transition: transform 0.3s;
}
.sticky-card:nth-child(1) { top: 120px; background: #E8F0FE; }
.sticky-card:nth-child(2) { top: 140px; background: #FFF0F0; }
.sticky-card:nth-child(3) { top: 160px; background: #F0FAF5; }
.f-icon {
    width: 80px; height: 80px;
    background: var(--flat-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    margin-bottom: 24px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}
.f-content h3 {
    font-size: 36px;
    margin-bottom: 20px;
}
.f-content p {
    font-size: 18px;
    color: #555;
    margin-bottom: 24px;
}
.f-list {
    list-style: none;
}
.f-list li {
    font-size: 16px;
    font-weight: 600;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}
.f-list li::before {
    content: '';
    width: 8px; height: 8px;
    background: var(--flat-primary);
    border-radius: 50%;
}

/* Nodes - Flat Tag Grid */
.nodes-section {
    padding: 100px 0;
    background: var(--flat-white);
    border-radius: 60px;
    margin: 0 20px;
}
.nodes-wrap {
    text-align: center;
}
.tag-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 40px;
}
.node-tag {
    background: var(--flat-bg);
    padding: 16px 32px;
    border-radius: 100px;
    font-size: 20px;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background 0.3s;
}
.node-tag:hover {
    background: var(--flat-primary);
    color: var(--flat-white);
}
.node-tag .speed {
    font-size: 14px;
    background: var(--flat-accent);
    color: var(--flat-text);
    padding: 4px 10px;
    border-radius: 20px;
}

/* Reviews - Masonry Layout */
.reviews-section {
    padding: 100px 0;
}
.masonry-grid {
    column-count: 3;
    column-gap: 24px;
}
.review-card {
    background: var(--flat-white);
    border-radius: 24px;
    padding: 32px;
    margin-bottom: 24px;
    break-inside: avoid;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}
.r-stars {
    color: var(--flat-accent);
    font-size: 24px;
    margin-bottom: 16px;
}
.r-text {
    font-size: 18px;
    line-height: 1.5;
    margin-bottom: 24px;
    font-weight: 600;
}
.r-user {
    display: flex;
    align-items: center;
    gap: 12px;
}
.r-avatar {
    width: 48px; height: 48px;
    background: var(--flat-primary);
    color: var(--flat-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 20px;
}
.r-info h4 { font-size: 16px; }
.r-info span { font-size: 14px; color: #888; }

/* Pricing - Overlapping Cards */
.pricing-section {
    padding: 100px 0;
}
.pricing-flex {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
}
.price-card {
    background: var(--flat-white);
    border-radius: 40px;
    padding: 48px;
    flex: 1;
    max-width: 380px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    position: relative;
}
.price-card.pro {
    background: var(--flat-primary);
    color: var(--flat-white);
    transform: scale(1.05);
    z-index: 2;
    box-shadow: 0 20px 50px rgba(67, 83, 255, 0.3);
}
.p-badge {
    position: absolute;
    top: -16px; left: 50%;
    transform: translateX(-50%);
    background: var(--flat-accent);
    color: var(--flat-text);
    padding: 8px 24px;
    border-radius: 100px;
    font-weight: 800;
    font-size: 14px;
}
.p-title { font-size: 24px; margin-bottom: 8px; }
.p-desc { font-size: 16px; opacity: 0.8; margin-bottom: 32px; }
.p-price { font-size: 64px; font-weight: 900; margin-bottom: 32px; line-height: 1; }
.p-price span { font-size: 18px; font-weight: 600; opacity: 0.8; }
.p-feat { list-style: none; margin-bottom: 40px; }
.p-feat li { padding: 12px 0; font-weight: 600; border-bottom: 1px solid rgba(0,0,0,0.05); display: flex; align-items: center; gap: 12px; }
.price-card.pro .p-feat li { border-bottom-color: rgba(255,255,255,0.1); }
.p-feat li::before { content: '✓'; color: var(--flat-green); font-weight: 900; }

/* FAQ - Flat Accordion */
.faq-section {
    padding: 100px 0;
}
.faq-wrap {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    background: var(--flat-white);
    border-radius: 24px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}
.faq-q {
    font-size: 20px;
    font-weight: 800;
    color: var(--flat-primary);
    margin-bottom: 16px;
}
.faq-a {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
}

/* Footer */
.flat-footer {
    background: var(--flat-text);
    color: var(--flat-white);
    padding: 80px 0 40px;
    border-radius: 60px 60px 0 0;
    margin-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 60px;
}
.f-brand { font-size: 32px; font-weight: 900; color: var(--flat-accent); margin-bottom: 16px; }
.f-desc { color: #aaa; }
.f-links-group { display: flex; gap: 60px; }
.f-col h4 { font-size: 18px; margin-bottom: 24px; color: var(--flat-white); }
.f-col a { display: block; color: #aaa; margin-bottom: 12px; font-weight: 600; transition: color 0.3s; }
.f-col a:hover { color: var(--flat-accent); }
.f-bottom { text-align: center; padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.1); color: #888; font-weight: 600; }

/* Subpages */
.page-header {
    padding: 160px 0 80px;
    text-align: center;
}
.page-title { font-size: 64px; margin-bottom: 24px; }
.page-desc { font-size: 20px; color: #555; max-width: 600px; margin: 0 auto; }

.dl-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    padding-bottom: 100px;
}
.dl-card {
    background: var(--flat-white);
    border-radius: 40px;
    padding: 48px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}
.dl-card:hover { transform: translateY(-10px); }
.dl-icon { font-size: 64px; margin-bottom: 24px; }
.dl-card h3 { font-size: 28px; margin-bottom: 16px; }
.dl-card p { color: #555; margin-bottom: 32px; }

.help-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    padding-bottom: 100px;
}
.help-nav { position: sticky; top: 120px; }
.help-nav a {
    display: block;
    padding: 16px 24px;
    background: var(--flat-white);
    border-radius: 16px;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--flat-text);
    transition: all 0.3s;
}
.help-nav a:hover, .help-nav a.active {
    background: var(--flat-primary);
    color: var(--flat-white);
}
.help-content {
    background: var(--flat-white);
    border-radius: 40px;
    padding: 60px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}
.help-content h2 { font-size: 36px; color: var(--flat-primary); margin-bottom: 32px; }
.help-content h3 { font-size: 24px; margin: 32px 0 16px; }
.help-content p, .help-content li { font-size: 16px; color: #555; margin-bottom: 16px; line-height: 1.8; }
.help-content ul { padding-left: 24px; }

/* Responsive */
@media (max-width: 1024px) {
    .pill-nav { display: none; }
    .sticky-card { grid-template-columns: 1fr; text-align: center; }
    .f-icon { margin: 0 auto 24px; }
    .f-list li { justify-content: center; }
    .masonry-grid { column-count: 2; }
    .pricing-flex { flex-direction: column; }
    .price-card { max-width: 100%; width: 100%; }
    .price-card.pro { transform: none; }
    .footer-grid, .dl-grid, .help-layout { grid-template-columns: 1fr; }
    .help-nav { position: static; display: flex; flex-wrap: wrap; gap: 12px; }
    .help-nav a { margin-bottom: 0; }
}
@media (max-width: 768px) {
    .hero-title { font-size: 48px; }
    .hero-actions { flex-direction: column; }
    .masonry-grid { column-count: 1; }
    .f-links-group { flex-direction: column; gap: 32px; }
    .dl-card { padding: 32px; }
    .help-content { padding: 32px; }
}