/* Snowfield Silver-Blue Pure Style - Layered Paper Cards */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&family=Noto+Sans+SC:wght@300;400;700;900&display=swap');

:root {
    --snow-bg: #eef2f6;
    --ice-blue: #d9e6f2;
    --silver-light: #f8fafd;
    --silver-shadow: rgba(176, 190, 197, 0.25);
    --primary-blue: #1a73e8;
    --primary-hover: #1557b0;
    --text-dark: #102a43;
    --text-light: #627d98;
    --font-en: 'Inter', sans-serif;
    --font-cn: 'Noto Sans SC', sans-serif;
}

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

body {
    background-color: var(--snow-bg);
    color: var(--text-dark);
    font-family: var(--font-cn);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 50% 0%, var(--ice-blue) 0%, transparent 50%);
}

h1, h2, h3, h4, .font-en { font-family: var(--font-en); }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; height: auto; display: block; border-radius: 20px; }

/* 1. Right Floating Navigation */
.right-nav {
    position: fixed;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 1000;
}

.nav-pill {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.5);
    padding: 12px 20px;
    border-radius: 30px;
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px var(--silver-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-pill:hover, .nav-pill.active {
    background: var(--primary-blue);
    color: #fff;
    transform: translateX(-10px);
    box-shadow: 0 8px 25px rgba(26, 115, 232, 0.3);
}

.nav-brand {
    writing-mode: horizontal-tb;
    font-size: 1.2rem;
    font-weight: 900;
    color: var(--primary-blue);
    margin-bottom: 20px;
    background: #fff;
    padding: 15px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 15px var(--silver-shadow);
}

/* 2. Layered Paper Stack Layout */
.paper-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.paper-card {
    background: #ffffff;
    width: 100%;
    border-radius: 40px;
    padding: 80px;
    box-shadow: 0 -20px 50px var(--silver-shadow);
    margin-top: -40px; /* Overlap effect */
    position: relative;
    border-top: 1px solid rgba(255,255,255,0.8);
}

/* Z-index stacking so top cards cast shadow on bottom cards */
.card-1 { z-index: 10; margin-top: 0; }
.card-2 { z-index: 9; }
.card-3 { z-index: 8; }
.card-4 { z-index: 7; }
.card-5 { z-index: 6; }
.card-6 { z-index: 5; }
.card-7 { z-index: 4; }
.card-8 { z-index: 3; }

/* Buttons */
.btn-primary {
    background: var(--primary-blue);
    color: #fff;
    padding: 15px 35px;
    border-radius: 30px;
    font-weight: 600;
    display: inline-block;
    box-shadow: 0 10px 20px rgba(26, 115, 232, 0.2);
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-3px); box-shadow: 0 15px 25px rgba(26, 115, 232, 0.3); }

.btn-secondary {
    background: var(--silver-light);
    color: var(--text-dark);
    padding: 15px 35px;
    border-radius: 30px;
    font-weight: 600;
    display: inline-block;
}
.btn-secondary:hover { background: var(--ice-blue); }

/* 3. Hero Section */
.hero-layout {
    display: flex;
    align-items: center;
    gap: 60px;
}
.hero-text { flex: 1; }
.hero-text h1 {
    font-size: 4.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    font-weight: 900;
    color: var(--text-dark);
    letter-spacing: -1px;
}
.hero-text p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 40px;
}
.hero-actions { display: flex; gap: 20px; margin-bottom: 40px; }
.trust-bar {
    display: flex;
    gap: 20px;
    font-size: 0.9rem;
    color: var(--text-light);
}
.trust-bar span::before { content: '✓'; color: var(--primary-blue); margin-right: 5px; font-weight: bold; }

.hero-img { flex: 1; }
.hero-img img { box-shadow: 0 20px 40px var(--silver-shadow); }

/* 4. Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}
.stat-item h3 { font-size: 3.5rem; color: var(--primary-blue); line-height: 1; margin-bottom: 10px; }
.stat-item p { color: var(--text-light); font-weight: 600; }

/* 5. Horizontal Scroll Features */
.section-title {
    font-size: 2.5rem;
    margin-bottom: 50px;
    text-align: center;
    color: var(--text-dark);
}

.features-scroll {
    display: flex;
    gap: 30px;
    overflow-x: auto;
    padding-bottom: 20px;
    scroll-snap-type: x mandatory;
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.features-scroll::-webkit-scrollbar { display: none; }

.feature-box {
    min-width: 350px;
    background: var(--silver-light);
    padding: 40px;
    border-radius: 30px;
    scroll-snap-align: start;
    border: 1px solid var(--ice-blue);
}
.feature-box img { width: 80px; height: 80px; margin-bottom: 20px; }
.feature-box h3 { font-size: 1.5rem; margin-bottom: 15px; }
.feature-box p { color: var(--text-light); }

/* 6. Diamond Nodes */
.nodes-diamond {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}
.diamond-tag {
    background: #fff;
    border: 2px solid var(--ice-blue);
    padding: 15px 30px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: 0.3s;
}
.diamond-tag:hover { border-color: var(--primary-blue); transform: translateY(-5px); box-shadow: 0 10px 20px var(--silver-shadow); }
.dt-city { font-weight: 700; font-size: 1.1rem; }
.dt-ping { color: var(--primary-blue); font-size: 0.9rem; background: var(--silver-light); padding: 2px 10px; border-radius: 10px; }

/* 7. Clean Quotes (Reviews) */
.quotes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}
.quote-item {
    position: relative;
    padding-top: 30px;
}
.quote-item::before {
    content: '"';
    position: absolute;
    top: -20px; left: -10px;
    font-size: 6rem;
    color: var(--ice-blue);
    font-family: serif;
    line-height: 1;
    z-index: 0;
}
.quote-text { position: relative; z-index: 1; font-size: 1.1rem; color: var(--text-dark); margin-bottom: 20px; font-style: italic; }
.quote-author { font-weight: 700; color: var(--primary-blue); }
.quote-author span { display: block; font-weight: 400; color: var(--text-light); font-size: 0.9rem; }
.quote-stars { color: #fbbc05; margin-bottom: 15px; }

/* 8. Minimal Pillars (Pricing) */
.pricing-pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.pillar {
    border: 1px solid var(--ice-blue);
    border-radius: 30px;
    padding: 50px 40px;
    text-align: center;
    transition: 0.3s;
}
.pillar.recommended {
    background: var(--primary-blue);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 20px 40px rgba(26, 115, 232, 0.2);
    border: none;
}
.pillar.recommended .text-light { color: rgba(255,255,255,0.8); }
.pillar.recommended .btn-primary { background: #fff; color: var(--primary-blue); }

.p-name { font-size: 1.2rem; font-weight: 600; margin-bottom: 20px; }
.p-price { font-size: 4rem; font-weight: 900; margin-bottom: 30px; line-height: 1; }
.p-price span { font-size: 1.2rem; font-weight: 400; }
.p-features { list-style: none; text-align: left; margin-bottom: 40px; }
.p-features li { padding: 12px 0; border-bottom: 1px solid var(--ice-blue); }
.pillar.recommended .p-features li { border-bottom-color: rgba(255,255,255,0.2); }
.p-features li::before { content: '•'; color: var(--primary-blue); margin-right: 10px; }
.pillar.recommended .p-features li::before { color: #fff; }

/* 9. FAQ List */
.faq-container { max-width: 800px; margin: 0 auto; }
.faq-box { margin-bottom: 30px; }
.faq-q { font-size: 1.2rem; font-weight: 700; color: var(--text-dark); margin-bottom: 10px; display: flex; gap: 15px; }
.faq-q::before { content: 'Q.'; color: var(--primary-blue); }
.faq-a { color: var(--text-light); padding-left: 35px; }

/* 10. Footer */
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}
.foot-brand { font-size: 1.8rem; font-weight: 900; color: var(--primary-blue); margin-bottom: 20px; }
.foot-desc { color: var(--text-light); }
.foot-col h4 { margin-bottom: 20px; color: var(--text-dark); }
.foot-col ul { list-style: none; }
.foot-col li { margin-bottom: 12px; }
.foot-col a { color: var(--text-light); }
.foot-col a:hover { color: var(--primary-blue); }
.foot-bottom { grid-column: 1 / -1; text-align: center; padding-top: 30px; border-top: 1px solid var(--ice-blue); color: var(--text-light); margin-top: 20px; }

/* Subpages */
.sub-header { text-align: center; padding: 40px 0; }
.sub-header h1 { font-size: 3.5rem; margin-bottom: 20px; }
.sub-header p { font-size: 1.2rem; color: var(--text-light); }

.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; }
.dl-box { background: var(--silver-light); border-radius: 30px; padding: 50px; text-align: center; border: 1px solid var(--ice-blue); }
.dl-icon { font-size: 4rem; margin-bottom: 20px; }
.dl-box h3 { font-size: 1.8rem; margin-bottom: 15px; }
.dl-box p { color: var(--text-light); margin-bottom: 30px; }

.help-layout { display: grid; grid-template-columns: 250px 1fr; gap: 60px; }
.help-sidebar { position: sticky; top: 40px; display: flex; flex-direction: column; gap: 10px; }
.help-sidebar a { padding: 15px 20px; border-radius: 15px; color: var(--text-light); font-weight: 600; }
.help-sidebar a.active, .help-sidebar a:hover { background: var(--ice-blue); color: var(--primary-blue); }
.help-article { margin-bottom: 50px; }
.help-article h3 { font-size: 1.8rem; color: var(--text-dark); margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--ice-blue); }
.help-article p, .help-article li { color: var(--text-light); margin-bottom: 15px; font-size: 1.05rem; }
.help-article ul { padding-left: 20px; }

/* Responsive */
@media (max-width: 1200px) {
    .right-nav { display: none; } /* Hide right nav on smaller screens */
    .paper-card { padding: 50px 30px; }
    .hero-layout { flex-direction: column; text-align: center; }
    .hero-actions, .trust-bar { justify-content: center; }
    .hero-text h1 { font-size: 3.5rem; }
}
@media (max-width: 992px) {
    .stats-grid, .quotes-grid, .pricing-pillars { grid-template-columns: repeat(2, 1fr); }
    .pillar.recommended { transform: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .help-layout { grid-template-columns: 1fr; }
    .help-sidebar { position: static; flex-direction: row; flex-wrap: wrap; }
}
@media (max-width: 768px) {
    .stats-grid, .quotes-grid, .pricing-pillars, .dl-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
    .trust-bar { flex-direction: column; gap: 10px; }
}