/* ===================================================================
   尔湾云 (ErwanCloud) - High-Converting SEO Optimized Stylesheet
   Theme: California Tech Azure (#2563EB) & Solar Amber (#F59E0B)
   Pure Native CSS | Zero External Dependencies | Ultra Fast Loading
   =================================================================== */

:root {
    /* Brand California Tech Azure & Solar Amber Palette */
    --primary-color: #2563eb;       /* California Tech Royal Blue */
    --primary-hover: #1d4ed8;       /* Deep Navy Hover */
    --primary-dark: #1e40af;        /* Border accent */
    --primary-glow: rgba(37, 99, 235, 0.28);
    
    --accent-color: #f59e0b;        /* Solar Amber CTA */
    --accent-hover: #d97706;        /* Deep Gold Hover */
    --accent-border: #b45309;       /* Distinct Button Border */
    --accent-glow: rgba(245, 158, 11, 0.35);

    /* Backgrounds */
    --bg-main: #f8fafc;            /* Crisp clean light slate */
    --bg-card: #ffffff;            /* Pure white surface */
    --bg-alt: #f1f5f9;             /* Light gray-blue alternate */
    --bg-dark: #0f172a;            /* Deep navy dark section */
    
    /* High-Contrast Typography */
    --text-main: #0f172a;          /* Rich slate black */
    --text-muted: #334155;         /* Readable mid slate */
    --text-light: #64748b;         /* Subtle secondary text */
    --text-white: #ffffff;
    
    /* Crisp Borders & Separators */
    --border-color: #e2e8f0;       /* Base soft border */
    --border-nav: #cbd5e1;         /* Clear distinct nav border */
    --border-hover: #94a3b8;
    --highlight: #f59e0b;          /* 5-star solar yellow */
    
    /* Spacing & Layout */
    --container-max: 1240px;
    --nav-height: 74px;
}

/* Reset & Defaults */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body {
    overflow-x: hidden;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

img, svg {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.section-padding {
    padding: 95px 0;
}

.text-center {
    text-align: center;
}

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

/* ===================================================================
   Buttons & Interactive Elements (Distinct, Elevated & Clickable)
   =================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 28px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    min-height: 48px; /* Mobile touch friendly target */
    text-align: center;
    white-space: nowrap;
    position: relative;
    user-select: none;
}

/* Primary Button: California Tech Blue */
.btn-primary {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #ffffff;
    border: 2px solid #1e40af;
    box-shadow: 0 4px 14px var(--primary-glow), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    border-color: #172554;
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(37, 99, 235, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

/* Accent Button: Solar Amber High-Conversion */
.btn-accent {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: #0f172a;
    border: 2px solid #b45309;
    font-weight: 800;
    box-shadow: 0 4px 16px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn-accent:hover {
    background: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
    border-color: #92400e;
    color: #000000;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.btn-accent:active {
    transform: translateY(1px);
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

/* Outline Button */
.btn-outline {
    background-color: #ffffff;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.btn-outline:hover {
    background-color: #eff6ff;
    border-color: var(--primary-hover);
    color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.16);
}

.btn-outline:active {
    transform: translateY(1px);
}

.btn-large {
    padding: 15px 42px;
    font-size: 1.15rem;
    border-radius: 12px;
}

.btn-block {
    width: 100%;
}

/* ===================================================================
   Header & Sticky Navigation (With Clear Distinct Border)
   =================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 1000;
    /* Clear distinct border between sticky nav and body */
    border-bottom: 2px solid var(--border-nav);
    box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: opacity 0.2s;
}

.brand-logo:hover {
    opacity: 0.9;
}

.brand-logo img {
    height: 38px;
    width: auto;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links > a:not(.btn) {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.98rem;
    padding: 8px 0;
    position: relative;
}

.nav-links > a:not(.btn):hover {
    color: var(--primary-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-toggle, .nav-toggle-label {
    display: none;
}

/* ===================================================================
   Hero Section (2-Column Layout with Animated Vector Art)
   =================================================================== */
.hero {
    min-height: 94vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 70px;
    background: radial-gradient(circle at 30% 20%, #eff6ff 0%, #f8fafc 70%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -15%;
    width: 50vw;
    height: 50vw;
    max-width: 600px;
    max-height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -10%;
    right: -10%;
    width: 45vw;
    height: 45vw;
    max-width: 500px;
    max-height: 500px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text-col {
    text-align: left;
    opacity: 1 !important;
    transform: none !important;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: #fffbeb;
    color: #b45309;
    border: 1.5px solid #fde68a;
    padding: 8px 20px;
    border-radius: 999px;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.12);
}

.hero h1 {
    font-size: 3.25rem;
    line-height: 1.2;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.03em;
    margin-bottom: 22px;
}

.hero h1 .highlight-text {
    color: var(--primary-color);
    position: relative;
}

.hero .subtitle {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-muted);
    margin-bottom: 36px;
    max-width: 620px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 34px;
    align-items: center;
}

.hero-trust-badges {
    display: flex;
    align-items: center;
    gap: 24px;
    color: var(--text-light);
    font-size: 0.9rem;
    font-weight: 600;
    flex-wrap: wrap;
}

.hero-trust-badges span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ===================================================================
   Animated Vector Art Showcase (Transparent Background)
   =================================================================== */
.hero-art-col {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1 !important;
    transform: none !important;
}

.vector-art-wrapper {
    position: relative;
    width: 100%;
    max-width: 520px;
    height: 480px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-vector-svg {
    width: 100%;
    height: 100%;
    overflow: visible;
}

/* Vector Art Animations */
.anim-spin-slow {
    transform-origin: 270px 250px;
    transform-box: view-box;
    animation: rotateOrbit 40s linear infinite;
}

.anim-spin-reverse {
    transform-origin: 270px 250px;
    transform-box: view-box;
    animation: rotateOrbitReverse 30s linear infinite;
}

.anim-float-center {
    animation: floatCenter 4.5s ease-in-out infinite alternate;
}

.anim-pulse {
    animation: pulseDot 2.5s ease-in-out infinite;
}

@keyframes rotateOrbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes rotateOrbitReverse {
    from { transform: rotate(360deg); }
    to { transform: rotate(0deg); }
}

@keyframes floatCenter {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(-8px) scale(1.02); }
}

@keyframes pulseDot {
    0%, 100% { r: 5px; opacity: 0.8; }
    50% { r: 8px; opacity: 1; }
}

/* Floating Marketing Point Badges */
.marketing-badge {
    position: absolute;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid rgba(203, 213, 225, 0.9);
    border-radius: 14px;
    padding: 12px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
    z-index: 2;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.marketing-badge:hover {
    transform: scale(1.05) translateY(-3px);
    box-shadow: 0 16px 36px -4px rgba(37, 99, 235, 0.2);
    border-color: var(--primary-color);
}

.marketing-badge .badge-icon {
    font-size: 1.6rem;
    line-height: 1;
}

.marketing-badge .badge-content strong {
    display: block;
    font-size: 0.92rem;
    color: var(--text-main);
    font-weight: 800;
    white-space: nowrap;
}

.marketing-badge .badge-content small {
    display: block;
    font-size: 0.78rem;
    color: var(--text-light);
    font-weight: 600;
    white-space: nowrap;
}

/* Badge Absolute Coordinates */
.badge-top-left {
    top: 25px;
    left: 0;
    animation: floatBadge1 4s ease-in-out infinite alternate;
}

.badge-top-right {
    top: 40px;
    right: -10px;
    animation: floatBadge2 4.8s ease-in-out infinite alternate;
}

.badge-bottom-right {
    bottom: 45px;
    right: 5px;
    animation: floatBadge3 4.2s ease-in-out infinite alternate;
}

.badge-bottom-left {
    bottom: 30px;
    left: -15px;
    animation: floatBadge4 5.2s ease-in-out infinite alternate;
}

@keyframes floatBadge1 {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}
@keyframes floatBadge2 {
    0% { transform: translateY(-8px); }
    100% { transform: translateY(6px); }
}
@keyframes floatBadge3 {
    0% { transform: translateY(4px); }
    100% { transform: translateY(-8px); }
}
@keyframes floatBadge4 {
    0% { transform: translateY(-6px); }
    100% { transform: translateY(8px); }
}

/* ===================================================================
   Section Global Headers
   =================================================================== */
.section-header {
    text-align: center;
    max-width: 740px;
    margin: 0 auto 56px;
}

.section-header .badge-tag {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 6px 14px;
    border-radius: 6px;
    margin-bottom: 14px;
    border: 1px solid #dbeafe;
}

.section-header h2 {
    font-size: 2.35rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-header p {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ===================================================================
   Core Features & AI / Streaming Showcase
   =================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 36px;
}

.feature-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    padding: 38px 30px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.02);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary-color);
    box-shadow: 0 16px 36px rgba(37, 99, 235, 0.1);
}

.feature-card .icon-wrapper {
    width: 62px;
    height: 62px;
    border-radius: 14px;
    background: #eff6ff;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
    border: 1.5px solid #dbeafe;
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 14px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.75;
}

/* Streaming & AI Support Banner Card */
.stream-ai-card {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-radius: 20px;
    padding: 46px;
    color: #ffffff;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.18);
    border: 1.5px solid #334155;
}

.stream-ai-card h3 {
    font-size: 1.85rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: #ffffff;
}

.stream-ai-card p {
    color: #94a3b8;
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 24px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.service-tag {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.18);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.stream-perks-list {
    list-style: none;
}

.stream-perks-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 18px;
    color: #e2e8f0;
    font-size: 1.05rem;
}

.stream-perks-list li svg {
    color: #38bdf8;
    flex-shrink: 0;
    margin-top: 3px;
}

/* ===================================================================
   Pricing Section
   =================================================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    align-items: center;
}

.price-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 18px;
    padding: 42px 32px;
    position: relative;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.02);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.price-card:hover {
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.08);
}

.price-card.recommended {
    border: 2.5px solid var(--primary-color);
    box-shadow: 0 16px 42px rgba(37, 99, 235, 0.16);
    transform: scale(1.04);
    background: #ffffff;
    z-index: 2;
}

.price-card.recommended:hover {
    transform: scale(1.04) translateY(-6px);
}

.recommended-badge {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #ffffff;
    padding: 6px 20px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
    border: 1.5px solid #60a5fa;
}

.price-header {
    text-align: center;
    margin-bottom: 26px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border-color);
}

.price-header h3 {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 12px;
}

.price-header .price {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--text-main);
    line-height: 1;
}

.price-header .price .currency {
    font-size: 1.5rem;
    vertical-align: super;
    margin-right: 4px;
    color: var(--primary-color);
}

.price-header .price .period {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
}

.billing-note {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 10px;
    font-weight: 500;
}

.price-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    text-align: center;
    margin-bottom: 24px;
    min-height: 48px;
}

.price-features {
    list-style: none;
    margin-bottom: 32px;
}

.price-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 0;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.98rem;
    border-bottom: 1px solid #f1f5f9;
}

.price-features li svg {
    color: #10b981;
    flex-shrink: 0;
}

/* ===================================================================
   Supported Platforms & Download Section
   =================================================================== */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.platform-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    padding: 34px 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.platform-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 14px 30px rgba(37, 99, 235, 0.1);
}

.platform-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: #f8fafc;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    border: 1.5px solid var(--border-color);
}

.platform-card h3 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 10px;
}

.platform-clients {
    color: var(--primary-color);
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.platform-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
    line-height: 1.65;
    margin-bottom: 24px;
    flex-grow: 1;
}

/* ===================================================================
   Why Choose Section (SEO / GEO / SERP Focused)
   =================================================================== */
.why-choose-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 1040px;
    margin: 0 auto;
}

.why-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    padding: 34px;
    transition: all 0.25s ease;
}

.why-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
}

.why-card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.why-card-header .icon-emoji {
    font-size: 2rem;
    line-height: 1;
}

.why-card-header h3 {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

.why-card p {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.75;
    margin-bottom: 14px;
}

.why-card strong {
    color: var(--text-main);
    font-weight: 700;
}

.why-points {
    list-style: none;
    padding-left: 0;
}

.why-points li {
    font-size: 0.92rem;
    color: var(--text-muted);
    padding: 6px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.why-points li::before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

/* ===================================================================
   Testimonials Marquee Section (Pure CSS Infinite Loop)
   =================================================================== */
.marquee-container {
    overflow: hidden;
    width: 100%;
    position: relative;
    padding: 24px 0;
}

.marquee-container::before,
.marquee-container::after {
    content: "";
    position: absolute;
    top: 0;
    width: 14%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.marquee-container::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-alt), transparent);
}

.marquee-container::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-alt), transparent);
}

.marquee-track {
    display: flex;
    width: fit-content;
    animation: marqueeScroll 38s linear infinite;
}

.marquee-track:hover {
    animation-play-state: paused;
}

@keyframes marqueeScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.review-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    padding: 28px 26px;
    border-radius: 16px;
    width: 360px;
    margin: 0 14px;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.03);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.stars {
    color: var(--highlight);
    margin-bottom: 14px;
    letter-spacing: 2px;
    font-size: 1.15rem;
}

.review-text {
    color: var(--text-muted);
    font-size: 0.98rem;
    line-height: 1.7;
    margin-bottom: 18px;
    font-style: normal;
    flex-grow: 1;
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid #f1f5f9;
    padding-top: 14px;
}

.reviewer-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #eff6ff;
    color: var(--primary-color);
    font-weight: 800;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #dbeafe;
}

.reviewer-details .reviewer-name {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-main);
}

.reviewer-details .reviewer-role {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ===================================================================
   FAQ Section (Native HTML5 details & summary)
   =================================================================== */
.faq-list {
    max-width: 840px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    margin-bottom: 16px;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.02);
    transition: all 0.25s ease;
    overflow: hidden;
}

.faq-item:hover {
    border-color: #cbd5e1;
}

.faq-item[open] {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.08);
}

.faq-item summary {
    padding: 22px 26px;
    font-weight: 700;
    font-size: 1.12rem;
    cursor: pointer;
    list-style: none;
    position: relative;
    color: var(--text-main);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 400;
    line-height: 1;
    transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-content {
    padding: 0 26px 24px;
    color: var(--text-muted);
    font-size: 1.02rem;
    line-height: 1.75;
    border-top: 1px solid #f8fafc;
}

/* ===================================================================
   Bottom CTA Section
   =================================================================== */
.bottom-cta {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    padding: 90px 0;
    border-top: 2px solid #334155;
    position: relative;
    overflow: hidden;
}

.bottom-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.28) 0%, transparent 70%);
    pointer-events: none;
}

.bottom-cta h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 18px;
    color: #ffffff;
}

.bottom-cta p {
    font-size: 1.2rem;
    color: #94a3b8;
    max-width: 640px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

/* ===================================================================
   Footer (Dedicated 4 Titles)
   =================================================================== */
.footer {
    border-top: 2px solid var(--border-color);
    padding: 60px 0 35px;
    background-color: #ffffff;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 28px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.footer-brand .logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 6px;
    display: inline-block;
}

.footer-brand p {
    color: var(--text-light);
    font-size: 0.95rem;
}

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

.footer-links a {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.2s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    color: var(--text-light);
    font-size: 0.88rem;
}

/* ===================================================================
   Legal & Static Subpages (About, Terms, Privacy, Sitemap)
   =================================================================== */
.legal-content {
    max-width: 860px;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 50px) 24px 80px;
    opacity: 1 !important;
    transform: none !important;
}

.legal-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-main);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 16px;
}

.legal-content h2 {
    font-size: 1.55rem;
    font-weight: 700;
    margin: 36px 0 16px;
    color: var(--text-main);
}

.legal-content p {
    margin-bottom: 18px;
    color: var(--text-muted);
    line-height: 1.8;
    font-size: 1.05rem;
}

.legal-content ul, .legal-content ol {
    margin-bottom: 24px;
    padding-left: 24px;
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.8;
}

.legal-content li {
    margin-bottom: 10px;
}

.legal-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.02);
}

.sitemap-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
    margin-top: 30px;
}

.sitemap-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 14px;
    padding: 28px;
}

.sitemap-card.full-width {
    grid-column: 1 / -1;
}

.sitemap-card h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 16px;
    font-weight: 700;
}

.sitemap-card ul {
    list-style: none;
    padding-left: 0;
}

.sitemap-card li {
    margin-bottom: 12px;
}

.sitemap-card a {
    color: var(--text-muted);
    font-weight: 600;
    transition: color 0.2s;
}

.sitemap-card a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* ===================================================================
   Fade-In / Fade-Out Scroll Reveal System
   =================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-100 { transition-delay: 80ms; }
.delay-200 { transition-delay: 150ms; }
.delay-300 { transition-delay: 220ms; }
.delay-400 { transition-delay: 300ms; }

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1 !important;
        transform: none !important;
        transition: none !important;
    }
}

/* ===================================================================
   Responsive Mobile Media Queries
   =================================================================== */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .hero-text-col {
        text-align: center;
    }

    .hero .subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-trust-badges {
        justify-content: center;
    }

    .hero-art-col {
        order: -1; /* Display vector art attractively above or between */
    }

    .features-grid,
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }
    
    .price-card.recommended {
        transform: scale(1);
    }
    .price-card.recommended:hover {
        transform: translateY(-5px);
    }

    .stream-ai-card {
        grid-template-columns: 1fr;
        gap: 28px;
        padding: 32px;
    }
}

@media (max-width: 768px) {
    .section-padding {
        padding: 60px 0;
    }

    .hero {
        padding-top: calc(var(--nav-height) + 20px);
        min-height: auto;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero .subtitle {
        font-size: 1.05rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }

    .vector-art-wrapper {
        height: 380px;
        max-width: 360px;
        margin: 0 auto;
    }

    .badge-top-left { top: 12px; left: 0; }
    .badge-top-right { top: 12px; right: 0; }
    .badge-bottom-right { bottom: 18px; right: 0; }
    .badge-bottom-left { bottom: 18px; left: 0; }

    .marketing-badge {
        padding: 8px 12px;
        gap: 8px;
    }

    .marketing-badge .badge-icon {
        font-size: 1.3rem;
    }

    .marketing-badge .badge-content strong {
        font-size: 0.82rem;
    }

    .marketing-badge .badge-content small {
        font-size: 0.72rem;
    }

    /* Mobile Hamburger Menu (Zero JS) */
    .nav-toggle-label {
        display: flex;
        align-items: center;
        width: 32px;
        height: 24px;
        cursor: pointer;
        position: relative;
        z-index: 1001;
    }

    .nav-toggle-label span,
    .nav-toggle-label span::before,
    .nav-toggle-label span::after {
        display: block;
        background: var(--text-main);
        height: 3px;
        width: 100%;
        position: absolute;
        transition: all 0.3s ease;
        border-radius: 2px;
    }

    .nav-toggle-label span::before { content: ""; top: -8px; }
    .nav-toggle-label span::after { content: ""; bottom: -8px; }

    .nav-links {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background-color: #ffffff;
        flex-direction: column;
        padding: 24px 20px;
        gap: 18px;
        border-bottom: 2px solid var(--border-nav);
        box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
        transform: translateY(-160%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
    }

    .nav-actions {
        width: 100%;
        flex-direction: column;
        gap: 10px;
        padding-top: 10px;
        border-top: 1px solid var(--border-color);
    }

    .nav-actions .btn {
        width: 100%;
    }

    .nav-toggle:checked ~ .nav-links {
        transform: translateY(0);
    }
    
    .nav-toggle:checked ~ .nav-toggle-label span {
        background: transparent;
    }
    .nav-toggle:checked ~ .nav-toggle-label span::before {
        transform: rotate(45deg);
        top: 0;
    }
    .nav-toggle:checked ~ .nav-toggle-label span::after {
        transform: rotate(-45deg);
        bottom: 0;
    }

    /* Grids to single column */
    .features-grid,
    .platforms-grid,
    .why-choose-cards,
    .sitemap-grid {
        grid-template-columns: 1fr;
    }

    .bottom-cta h2 {
        font-size: 1.95rem;
    }

    .footer-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 24px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 20px;
    }
}

/* ===================================================================
   Blog Hub & Article Pages (推荐资讯 & 文章详情)
   =================================================================== */
.blog-header {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 50px;
    text-align: center;
    background: radial-gradient(circle at 50% 10%, #eff6ff 0%, #f8fafc 70%);
    position: relative;
    border-bottom: 1.5px solid var(--border-color);
    opacity: 1 !important;
    transform: none !important;
}

.blog-header h1 {
    font-size: 2.85rem;
    color: var(--text-main);
    margin-bottom: 18px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.blog-header p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 780px;
    margin: 0 auto;
    line-height: 1.8;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    padding: 60px 0 90px;
    opacity: 1 !important;
    transform: none !important;
}

.article-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 26px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 10px rgba(15, 23, 42, 0.02);
    opacity: 1 !important;
    transform: none !important;
}

.article-card:hover {
    transform: translateY(-6px) !important;
    box-shadow: 0 16px 36px rgba(37, 99, 235, 0.1);
    border-color: var(--primary-color);
}

.article-card .tag {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 14px;
    align-self: flex-start;
    border: 1px solid #dbeafe;
}

.article-card h2 {
    font-size: 1.28rem;
    margin-bottom: 14px;
    color: var(--text-main);
    font-weight: 800;
    line-height: 1.5;
}

.article-card p {
    color: var(--text-muted);
    flex-grow: 1;
    margin-bottom: 22px;
    line-height: 1.7;
    font-size: 0.95rem;
}

.article-card .read-more {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s;
}

.article-card:hover .read-more {
    gap: 8px;
    color: var(--primary-hover);
}

.breadcrumbs {
    padding: 18px 0;
    font-size: 0.95rem;
    color: var(--text-muted);
    border-bottom: 1.5px solid var(--border-color);
    background: #ffffff;
    margin-top: var(--nav-height);
}

.breadcrumbs a {
    color: var(--primary-color);
    font-weight: 600;
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.article-content {
    max-width: 840px;
    margin: 0 auto;
    padding: 50px 24px 100px;
    opacity: 1 !important;
    transform: none !important;
}

.article-content h1 {
    font-size: 2.6rem;
    color: var(--text-main);
    margin-bottom: 20px;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -0.02em;
}

.article-content .meta {
    color: var(--text-light);
    margin-bottom: 40px;
    font-size: 0.95rem;
    padding-bottom: 20px;
    border-bottom: 1.5px solid var(--border-color);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.article-content h2 {
    font-size: 1.75rem;
    margin: 48px 0 20px;
    color: var(--text-main);
    font-weight: 800;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
    font-size: 1.35rem;
    margin: 32px 0 14px;
    color: var(--text-main);
    font-weight: 700;
}

.article-content p {
    font-size: 1.12rem;
    line-height: 1.85;
    margin-bottom: 24px;
    color: var(--text-muted);
}

.article-content a {
    color: var(--primary-color);
    text-decoration: underline;
    font-weight: 600;
}

.article-content a:hover {
    color: var(--primary-hover);
}

.article-content ul, .article-content ol {
    margin-bottom: 26px;
    padding-left: 26px;
    font-size: 1.12rem;
    color: var(--text-muted);
    line-height: 1.85;
}

.article-content li {
    margin-bottom: 10px;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    background: #f8fafc;
    padding: 18px 24px;
    border-radius: 0 12px 12px 0;
    margin: 28px 0;
    font-style: normal;
    color: var(--text-main);
    font-size: 1.08rem;
    line-height: 1.75;
}

.article-content .cta-box {
    background: linear-gradient(135deg, #eff6ff 0%, #fffbeb 100%);
    border: 2px solid #bfdbfe;
    border-radius: 16px;
    padding: 32px;
    margin: 45px 0;
    text-align: center;
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.08);
}

.article-content .cta-box h3 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--text-main);
}

.article-content .cta-box p {
    font-size: 1.05rem;
    margin-bottom: 20px;
}

@media (max-width: 1024px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
    .blog-header h1 {
        font-size: 2.15rem;
    }
    .article-content h1 {
        font-size: 2rem;
    }
    .article-content h2 {
        font-size: 1.45rem;
    }
}