@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Outfit:wght@300;400;500;700;900&display=swap');

/* ==========================================
   Design System: Neumorphism & Minimalism
   Brand: 忍者云 (renzheyun.homes)
   Updated Palette: 银灰 (#E4E8ED), 蓝灰 (#8499A1 / #3E5A66), 锈玫瑰 (#A47B82), 浅灰 (#9B9696)
   ========================================== */

:root {
    /* Updated Color Swatches */
    --color-bg-base: #E4E8ED;        /* 银灰 Base Neumorphic Background */
    --color-surface: #E4E8ED;        /* Surface matching background */
    --color-brand-primary: #3E5A66;  /* Deep 蓝灰 Blue-Gray for Headings & Primary Buttons */
    --color-brand-secondary: #8499A1;/* 蓝灰 Soft Blue-Gray */
    --color-light-gray: #9B9696;     /* 浅灰 Light Gray */
    --color-rust-rose: #A47B82;      /* 锈玫瑰 Rust Rose Accent */
    --color-terracotta: #A47B82;     /* Warm Accent Badge */
    
    --color-text-main: #232E37;      /* Deep contrast text */
    --color-text-muted: #5E6E78;     /* Secondary text */
    --color-text-light: #8E9CA6;     /* Soft text */
    
    /* Neumorphic Dual Shadow Specs (Calibrated for 银灰 Base) */
    --shadow-convex: 8px 8px 18px #c0c8d2, -8px -8px 18px #ffffff;
    --shadow-convex-sm: 4px 4px 10px #c5cdd7, -4px -4px 10px #ffffff;
    --shadow-convex-hover: 12px 12px 26px #b6bfcb, -12px -12px 26px #ffffff;
    --shadow-concave: inset 4px 4px 10px #c0c8d2, inset -4px -4px 10px #ffffff;
    --shadow-concave-deep: inset 6px 6px 14px #b8c0ca, inset -6px -6px 14px #ffffff;
    
    --border-radius-sm: 12px;
    --border-radius-md: 20px;
    --border-radius-lg: 30px;
    --border-radius-pill: 50px;
    
    --transition-smooth: all 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--color-bg-base);
    color: var(--color-text-main);
    line-height: 1.75;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Custom Neumorphic Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--color-bg-base);
}
::-webkit-scrollbar-thumb {
    background: var(--color-brand-secondary);
    border-radius: var(--border-radius-pill);
    border: 2px solid var(--color-bg-base);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-brand-primary);
}

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

/* ==========================================
   Navbar Section
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(228, 232, 237, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    transition: var(--transition-smooth);
}
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    max-width: 1240px;
    margin: 0 auto;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-size: 1.45rem;
    font-weight: 900;
    color: var(--color-brand-primary);
    letter-spacing: -0.5px;
}
.logo-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    font-size: 1.2rem;
}
.logo span {
    display: none;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
    align-items: center;
}
.nav-links a {
    color: var(--color-text-main);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 14px;
    border-radius: var(--border-radius-pill);
    transition: var(--transition-smooth);
}
.nav-links a:hover {
    color: var(--color-brand-primary);
    box-shadow: var(--shadow-convex-sm);
}

.nav-cta {
    background: var(--color-brand-primary);
    color: #ffffff !important;
    box-shadow: var(--shadow-convex-sm);
    padding: 10px 22px !important;
    border-radius: var(--border-radius-pill) !important;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.nav-cta:hover {
    background: #2b3f48 !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-convex-hover) !important;
}

.mobile-toggle {
    display: none;
    background: var(--color-bg-base);
    border: none;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    box-shadow: var(--shadow-convex-sm);
    color: var(--color-brand-primary);
    font-size: 1.2rem;
    cursor: pointer;
}

/* ==========================================
   Hero Visual Section
   ========================================== */
.hero {
    padding: 150px 0 90px;
    position: relative;
    overflow: hidden;
}
.hero-content {
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: var(--border-radius-pill);
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    color: var(--color-brand-primary);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 28px;
}
.hero-badge i {
    color: var(--color-rust-rose);
}
.hero-title {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.25;
    color: var(--color-brand-primary);
    margin-bottom: 24px;
    letter-spacing: -1px;
}
.hero-title span {
    color: var(--color-rust-rose);
    position: relative;
    display: inline-block;
}
.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 720px;
    margin: 0 auto 36px;
    line-height: 1.8;
}
.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 36px;
    border-radius: var(--border-radius-pill);
    font-weight: 700;
    font-size: 1.05rem;
    text-decoration: none;
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
}
.btn-primary {
    background: var(--color-brand-primary);
    color: #ffffff;
    box-shadow: var(--shadow-convex);
}
.btn-primary:hover {
    background: #2b3f48;
    transform: translateY(-3px);
    box-shadow: var(--shadow-convex-hover);
}
.btn-secondary {
    background: var(--color-bg-base);
    color: var(--color-brand-primary);
    box-shadow: var(--shadow-convex);
}
.btn-secondary:hover {
    color: var(--color-rust-rose);
    transform: translateY(-3px);
    box-shadow: var(--shadow-convex-hover);
}

.hero-trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}
.trust-item {
    background: var(--color-bg-base);
    padding: 22px 18px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    text-align: center;
    transition: var(--transition-smooth);
}
.trust-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-convex-hover);
}
.trust-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    font-size: 1.3rem;
}
.trust-item h4 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 6px;
}
.trust-item p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==========================================
   Section Layout & Headings
   ========================================== */
.section {
    padding: 90px 0;
}
.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}
.section-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--border-radius-pill);
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    color: var(--color-brand-primary);
    font-size: 0.85rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}
.section-title {
    font-size: 2.3rem;
    font-weight: 900;
    color: var(--color-brand-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}
.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
}

/* ==========================================
   Core Advantages Grid
   ========================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.feature-card {
    background: var(--color-bg-base);
    padding: 32px 28px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    transition: var(--transition-smooth);
    position: relative;
    display: flex;
    flex-direction: column;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-convex-hover);
}
.feature-icon-wrapper {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    font-size: 1.5rem;
    margin-bottom: 22px;
}
.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 12px;
}
.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 18px;
}
.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: auto;
}
.feature-tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: var(--border-radius-pill);
    background: var(--color-bg-base);
    box-shadow: var(--shadow-concave);
    color: var(--color-brand-primary);
    font-weight: 600;
}

/* ==========================================
   Brand Features Banner (Image 2 Data)
   ========================================== */
.brand-intro-box {
    background: var(--color-bg-base);
    padding: 44px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    margin-top: 50px;
}
.brand-intro-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
}
.brand-intro-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.brand-intro-icon {
    width: 52px;
    height: 52px;
    min-width: 52px;
    border-radius: 14px;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-rust-rose);
    font-size: 1.4rem;
}
.brand-intro-text h4 {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 8px;
}
.brand-intro-text p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ==========================================
   Pricing Cards (Exact Image 1 Data)
   ========================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.pricing-card {
    background: var(--color-bg-base);
    padding: 36px 30px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    position: relative;
}
.pricing-card.popular {
    box-shadow: var(--shadow-convex-hover);
    border: 2px solid var(--color-brand-primary);
}
.pricing-badge {
    position: absolute;
    top: -14px;
    right: 24px;
    background: var(--color-rust-rose);
    color: #ffffff;
    padding: 4px 14px;
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    font-weight: 800;
}
.pricing-header {
    margin-bottom: 24px;
    text-align: center;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(62, 90, 102, 0.1);
}
.pricing-name {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--color-brand-primary);
    margin-bottom: 10px;
}
.pricing-price {
    font-size: 2.6rem;
    font-weight: 900;
    color: var(--color-brand-primary);
    line-height: 1;
}
.pricing-price span {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 500;
}
.pricing-features {
    list-style: none;
    margin-bottom: 30px;
    flex-grow: 1;
}
.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--color-text-main);
    margin-bottom: 14px;
}
.pricing-features li i {
    color: var(--color-brand-primary);
    font-size: 0.9rem;
}
.pricing-btn {
    width: 100%;
    text-align: center;
}

/* Special full-width plan container */
.pricing-full-banner {
    grid-column: 1 / -1;
    background: var(--color-bg-base);
    padding: 30px 36px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-top: 10px;
}
.pricing-full-info h4 {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 6px;
}
.pricing-full-info p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

/* ==========================================
   User Group / Audience Matrix
   ========================================== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.audience-card {
    background: var(--color-bg-base);
    padding: 30px 24px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    text-align: center;
    transition: var(--transition-smooth);
}
.audience-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-convex-hover);
}
.audience-icon {
    width: 54px;
    height: 54px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    font-size: 1.4rem;
}
.audience-card h4 {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 10px;
}
.audience-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ==========================================
   Testimonial Carousel (3-5 Items Neumorphic)
   ========================================== */
.carousel-wrapper {
    position: relative;
    max-width: 840px;
    margin: 0 auto;
    padding: 0 50px;
}
.carousel-container {
    overflow: hidden;
    border-radius: var(--border-radius-md);
}
.carousel-track {
    display: flex;
    transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.carousel-slide {
    min-width: 100%;
    padding: 10px;
}
.testimonial-card {
    background: var(--color-bg-base);
    padding: 40px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    text-align: center;
}
.testimonial-quote {
    font-size: 1.1rem;
    color: var(--color-text-main);
    line-height: 1.8;
    margin-bottom: 24px;
    font-style: italic;
}
.testimonial-rating {
    color: var(--color-rust-rose);
    font-size: 1.1rem;
    margin-bottom: 16px;
}
.testimonial-user {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}
.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    font-weight: 800;
    font-size: 1.1rem;
}
.user-info h5 {
    font-size: 1rem;
    font-weight: 800;
    color: var(--color-brand-primary);
}
.user-info span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    border: none;
    color: var(--color-brand-primary);
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    z-index: 10;
}
.carousel-btn:hover {
    color: var(--color-rust-rose);
    box-shadow: var(--shadow-convex-hover);
}
.carousel-btn.prev { left: 0; }
.carousel-btn.next { right: 0; }

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 24px;
}
.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    cursor: pointer;
    transition: var(--transition-smooth);
}
.dot.active {
    background: var(--color-brand-primary);
    box-shadow: var(--shadow-concave);
    width: 28px;
    border-radius: 10px;
}

/* ==========================================
   Knowledge Base Grid (Article Cards - 独立模块)
   ========================================== */
.kb-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}
.kb-card {
    background: var(--color-bg-base);
    padding: 30px 28px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    text-decoration: none;
}
.kb-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-convex-hover);
}
.kb-card h4 {
    font-size: 1.12rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 10px;
    line-height: 1.45;
}
.kb-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

/* ==========================================
   FAQ Section (独立模块)
   ========================================== */
.faq-container {
    max-width: 860px;
    margin: 0 auto;
}
.faq-item {
    background: var(--color-bg-base);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-convex);
    margin-bottom: 20px;
    overflow: hidden;
    transition: var(--transition-smooth);
}
.faq-question {
    padding: 24px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-brand-primary);
}
.faq-toggle-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-bg-base);
    box-shadow: var(--shadow-convex-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}
.faq-item.active .faq-toggle-icon {
    transform: rotate(180deg);
    box-shadow: var(--shadow-concave);
    color: var(--color-rust-rose);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 28px;
}
.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 28px 24px;
}
.faq-answer p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.75;
}

/* ==========================================
   Footer Section
   ========================================== */
.footer {
    background: var(--color-bg-base);
    padding: 80px 0 30px;
    border-top: 1px solid rgba(62, 90, 102, 0.08);
    margin-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 60px;
}
.footer-col h4 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    margin-bottom: 20px;
}
.footer-col p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}
.footer-links {
    list-style: none;
}
.footer-links li {
    margin-bottom: 12px;
}
.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}
.footer-links a:hover {
    color: var(--color-brand-primary);
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(62, 90, 102, 0.08);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ==========================================
   Responsive Adjustments
   ========================================== */
@media (max-width: 1024px) {
    .features-grid, .pricing-grid, .kb-grid, .audience-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-trust-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-bg-base);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }
    .nav-links.active {
        display: flex;
    }
    .mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .features-grid, .pricing-grid, .kb-grid, .audience-grid, .hero-trust-grid, .brand-intro-grid {
        grid-template-columns: 1fr;
    }
    .pricing-full-banner {
        flex-direction: column;
        text-align: center;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}