/* ===================================================================
   尔湾云 (Erwann Cloud) - Premium SaaS Accelerator Stylesheet
   Theme: Electric Indigo & Royal Violet (旗舰未来紫)
   Features:
   - Tactile 3D Button Affordance
   - Clear Dividing Sticky Navbar Boundary
   - High-Speed Animated Vector Art & Radar Tunnel Keyframes
   - Scroll-Triggered Fade-In / Fade-Out Motion
   - Fluid Mobile-First Responsive Breakpoints (@media)
   =================================================================== */

:root {
    /* Theme Option 4: Electric Indigo & Royal Violet */
    --primary-color: #6366f1;         /* Electric Indigo */
    --primary-hover: #4f46e5;         /* Deep Indigo */
    --primary-active: #4338ca;
    --primary-light: #eef2ff;         /* Soft Indigo Tint */
    --primary-glow: rgba(99, 102, 241, 0.32);
    --primary-shadow: #3730a3;        /* 3D button bottom border */

    --secondary-color: #8b5cf6;       /* Royal Violet */
    --secondary-hover: #7c3aed;
    --secondary-light: #f5f3ff;
    --secondary-glow: rgba(139, 92, 246, 0.28);

    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 60%, #a855f7 100%);
    --accent-btn-gradient: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    --accent-badge-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);

    --bg-main: #ffffff;
    --bg-card: #ffffff;
    --bg-alt: #f8fafc;
    --bg-dark: #0f172a;
    --bg-dark-card: #1e293b;

    --text-main: #0f172a;
    --text-muted: #334155;
    --text-sub: #64748b;
    --text-white: #ffffff;

    --border-color: #e2e8f0;          /* Crisp clean structural border */
    --border-highlight: #c7d2fe;      /* Subtle indigo border */
    --border-active: #818cf8;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 14px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 28px -6px rgba(15, 23, 42, 0.12), 0 8px 12px -6px rgba(15, 23, 42, 0.06);
    --shadow-nav: 0 4px 20px rgba(15, 23, 42, 0.06);

    --transition-fast: 0.18s ease;
    --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, 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;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

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

/* Layout Utilities */
.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

.section-padding {
    padding: 100px 0;
}

.bg-alt {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

/* Section Header */
.section-header {
    text-align: center;
    max-width: 780px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    padding: 5px 16px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 0.8px;
    text-transform: uppercase;
}

.section-header h2 {
    font-size: 2.35rem;
    font-weight: 900;
    color: var(--text-main);
    line-height: 1.25;
    margin-bottom: 16px;
    letter-spacing: -0.6px;
}

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

/* ===================================================================
   Tactile 3D Button Affordance (Unmistakable Clickability)
   =================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 26px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.4;
    cursor: pointer;
    min-height: 48px;
    min-width: 48px;
    border: 2px solid transparent;
    user-select: none;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
    text-align: center;
    white-space: nowrap;
    position: relative;
}

/* Primary Button: 3D Depth, Gradient Fill & Bottom Border */
.btn-primary {
    background: var(--accent-btn-gradient);
    color: var(--text-white);
    border-color: #4338ca;
    box-shadow: 0 4px 0 var(--primary-shadow), 0 6px 16px var(--primary-glow);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--primary-shadow), 0 10px 24px rgba(99, 102, 241, 0.45);
    border-color: #3730a3;
}

.btn-primary:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--primary-shadow), 0 3px 8px var(--primary-glow);
}

/* Outline Button: Crisp 2px Border & Physical Bottom Plate */
.btn-outline {
    background-color: var(--bg-card);
    color: var(--primary-color);
    border: 2px solid var(--border-highlight);
    box-shadow: 0 3px 0 #c7d2fe, 0 3px 8px rgba(15, 23, 42, 0.04);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-hover);
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 5px 0 #a5b4fc, 0 6px 14px rgba(99, 102, 241, 0.18);
}

.btn-outline:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 #a5b4fc;
}

.btn-large {
    padding: 15px 36px;
    font-size: 1.15rem;
    border-radius: var(--radius-md);
}

.btn-block {
    width: 100%;
}

/* ===================================================================
   Header & Sticky Navbar (Clear Dividing Boundary Line)
   =================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    /* Clear distinct 2px dividing border from body */
    border-bottom: 2px solid var(--border-color);
    box-shadow: var(--shadow-nav);
    transition: all var(--transition-normal);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.brand-logo:hover .brand-icon {
    transform: rotate(5deg) scale(1.05);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: 0 4px 12px var(--primary-glow);
    transition: transform var(--transition-fast);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    font-size: 0.96rem;
    font-weight: 700;
    color: var(--text-muted);
    position: relative;
    padding: 6px 0;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.nav-actions .btn {
    min-height: 42px;
    padding: 8px 20px;
    font-size: 0.925rem;
}

/* Pure CSS Mobile Hamburger Drawer */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: 10px;
}

.hamburger-line {
    display: block;
    width: 25px;
    height: 2.5px;
    background-color: var(--text-main);
    margin: 5px 0;
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ===================================================================
   Hero Section (2-Column Grid + Animated Vector Art)
   =================================================================== */
.hero {
    position: relative;
    padding-top: 155px;
    padding-bottom: 95px;
    background: radial-gradient(circle at 75% 20%, rgba(99, 102, 241, 0.08) 0%, rgba(255, 255, 255, 1) 70%);
    overflow: hidden;
}

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

.hero-content {
    text-align: left;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background-color: #ffffff;
    color: var(--primary-color);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-full);
    font-size: 0.925rem;
    font-weight: 800;
    margin-bottom: 22px;
    box-shadow: 0 2px 10px var(--primary-glow);
    animation: pulse-border 2.5s infinite;
}

@keyframes pulse-border {
    0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.35); }
    50% { box-shadow: 0 0 0 8px rgba(99, 102, 241, 0); }
}

.hero h1 {
    font-size: 2.85rem;
    font-weight: 900;
    line-height: 1.2;
    color: var(--text-main);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero h1 .highlight-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .subtitle {
    font-size: 1.18rem;
    color: var(--text-muted);
    line-height: 1.68;
    margin-bottom: 34px;
    max-width: 600px;
}

.hero-cta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.hero-trust-bar {
    display: flex;
    align-items: center;
    gap: 22px;
    flex-wrap: wrap;
    color: var(--text-sub);
    font-size: 0.88rem;
    font-weight: 700;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.trust-item svg {
    color: #10b981;
}

/* Hero Right: Transparent Animated Vector Art */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 420px;
}

.vector-art-svg {
    width: 100%;
    max-width: 480px;
    height: auto;
    filter: drop-shadow(0 15px 35px rgba(99, 102, 241, 0.15));
}

/* Keyframes for Vector Art Animations */
@keyframes pulse-ring {
    0% { transform: scale(0.92); opacity: 0.8; }
    50% { transform: scale(1.08); opacity: 0.25; }
    100% { transform: scale(0.92); opacity: 0.8; }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes spin-reverse {
    from { transform: rotate(360deg); }
    to { transform: rotate(0deg); }
}

@keyframes dash-flow {
    to { stroke-dashoffset: -32; }
}

@keyframes float-chip-1 {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

@keyframes float-chip-2 {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(8px); }
}

@keyframes float-chip-3 {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-6px); }
}

.anim-ring {
    transform-origin: 240px 210px;
    animation: pulse-ring 4s ease-in-out infinite;
}

.anim-spin {
    transform-origin: 240px 210px;
    animation: spin-slow 24s linear infinite;
}

.anim-spin-rev {
    transform-origin: 240px 210px;
    animation: spin-reverse 30s linear infinite;
}

.anim-dash {
    stroke-dasharray: 8 8;
    animation: dash-flow 1.2s linear infinite;
}

.anim-float-1 {
    animation: float-chip-1 4.5s ease-in-out infinite;
}

.anim-float-2 {
    animation: float-chip-2 5s ease-in-out infinite;
}

.anim-float-3 {
    animation: float-chip-3 4.2s ease-in-out infinite;
}

/* ===================================================================
   Dynamic Cards Section (Core Advantages)
   =================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 36px;
}

.feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 38px 30px;
    transition: all var(--transition-normal);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-highlight);
}

.feature-icon-box {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background-color: var(--primary-light);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
    border: 1px solid var(--border-highlight);
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.12);
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-main);
}

.feature-card p {
    font-size: 0.98rem;
    color: var(--text-muted);
    line-height: 1.65;
}

/* Streaming & AI Support Banner */
.stream-ai-banner {
    background: radial-gradient(circle at 10% 20%, #1e1b4b 0%, #0f172a 100%);
    border-radius: var(--radius-lg);
    padding: 40px 44px;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 36px;
    border: 1px solid #312e81;
    box-shadow: var(--shadow-md);
}

.stream-ai-info h3 {
    font-size: 1.55rem;
    font-weight: 900;
    margin-bottom: 12px;
    color: #ffffff;
}

.stream-ai-info p {
    color: #cbd5e1;
    font-size: 1rem;
    line-height: 1.6;
    max-width: 680px;
}

.stream-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.stream-pill {
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(165, 180, 252, 0.35);
    padding: 5px 15px;
    border-radius: var(--radius-full);
    font-size: 0.86rem;
    font-weight: 700;
    color: #e0e7ff;
}

/* ===================================================================
   Pricing Section (Tactile Pricing Cards)
   =================================================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: stretch;
}

.pricing-card {
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-highlight);
}

.pricing-card.recommended {
    border: 2px solid var(--primary-color);
    box-shadow: 0 10px 32px rgba(99, 102, 241, 0.2);
    background: linear-gradient(180deg, #faf5ff 0%, #ffffff 100%);
    transform: scale(1.03);
}

.pricing-card.recommended:hover {
    transform: scale(1.03) translateY(-8px);
    box-shadow: 0 14px 40px rgba(99, 102, 241, 0.3);
}

.badge-recommended {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-badge-gradient);
    color: #ffffff;
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 900;
    letter-spacing: 0.6px;
    box-shadow: 0 4px 12px var(--primary-glow);
}

.pricing-header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 24px;
    margin-bottom: 24px;
}

.pricing-header h3 {
    font-size: 1.45rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 12px;
}

.price-box {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: 6px;
}

.price-currency {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary-color);
}

.price-amount {
    font-size: 3.4rem;
    font-weight: 900;
    line-height: 1;
    color: var(--text-main);
}

.price-period {
    font-size: 1.05rem;
    color: var(--text-sub);
    font-weight: 700;
}

.pricing-billing {
    font-size: 0.88rem;
    color: var(--primary-color);
    font-weight: 800;
}

.pricing-features {
    margin-bottom: 32px;
    flex-grow: 1;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    font-size: 0.96rem;
    color: var(--text-muted);
}

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

/* ===================================================================
   Supported Platforms & Download Section
   =================================================================== */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 26px;
}

.platform-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 34px 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.platform-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-highlight);
}

.platform-icon-wrap {
    width: 66px;
    height: 66px;
    border-radius: 50%;
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    color: var(--primary-color);
    border: 1px solid var(--border-highlight);
}

.platform-card h3 {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-main);
}

.platform-clients {
    font-size: 0.875rem;
    color: var(--text-sub);
    margin-bottom: 24px;
    min-height: 42px;
    line-height: 1.5;
}

/* ===================================================================
   Why Choose Section (SEO & SERP Core)
   =================================================================== */
.why-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.why-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.why-card:hover {
    border-color: var(--border-highlight);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.why-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.why-emoji {
    font-size: 1.65rem;
    line-height: 1;
}

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

.why-card p {
    font-size: 0.96rem;
    color: var(--text-muted);
    line-height: 1.68;
}

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

/* ===================================================================
   Testimonials Marquee Section
   =================================================================== */
.testimonials-section {
    overflow: hidden;
    position: relative;
    padding: 85px 0;
}

.marquee-container {
    width: 100%;
    overflow: hidden;
    position: relative;
    mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 8%, black 92%, transparent 100%);
}

.marquee-track {
    display: flex;
    gap: 24px;
    width: max-content;
    animation: scroll-left 36s linear infinite;
    padding: 10px 0;
}

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

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

.testimonial-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 26px 28px;
    width: 370px;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.testimonial-card:hover {
    border-color: var(--border-highlight);
    box-shadow: var(--shadow-md);
}

.star-rating {
    color: #eab308;
    font-size: 1.15rem;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.testimonial-text {
    font-size: 0.93rem;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 18px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary-color);
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    border: 1px solid var(--border-highlight);
}

.author-info h4 {
    font-size: 0.96rem;
    font-weight: 800;
    color: var(--text-main);
}

.author-info span {
    font-size: 0.82rem;
    color: var(--text-sub);
}

/* ===================================================================
   FAQ Section (Native HTML5 Details/Summary)
   =================================================================== */
.faq-list {
    max-width: 840px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--border-highlight);
}

.faq-item[open] {
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.12);
}

.faq-question {
    padding: 22px 26px;
    font-size: 1.12rem;
    font-weight: 800;
    color: var(--text-main);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

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

.faq-arrow {
    width: 22px;
    height: 22px;
    color: var(--primary-color);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 26px 24px;
    font-size: 0.98rem;
    color: var(--text-muted);
    line-height: 1.75;
    border-top: 1px solid var(--border-color);
    padding-top: 18px;
}

/* ===================================================================
   Bottom CTA Section
   =================================================================== */
.bottom-cta {
    background: radial-gradient(circle at 50% 50%, #1e1b4b 0%, #0f172a 100%);
    color: #ffffff;
    padding: 90px 0;
    text-align: center;
    border-top: 1px solid #312e81;
}

.bottom-cta h2 {
    font-size: 2.5rem;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.bottom-cta p {
    font-size: 1.15rem;
    color: #cbd5e1;
    max-width: 660px;
    margin: 0 auto 38px;
    line-height: 1.6;
}

/* ===================================================================
   Footer (4 Titles Only)
   =================================================================== */
.site-footer {
    background-color: #090d16;
    color: #94a3b8;
    padding: 55px 0 40px;
    border-top: 1px solid #1e293b;
    font-size: 0.925rem;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 26px;
}

.footer-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 36px;
    flex-wrap: wrap;
}

.footer-nav a {
    color: #cbd5e1;
    font-weight: 700;
    transition: color var(--transition-fast);
}

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

.footer-copy {
    color: #64748b;
    font-size: 0.85rem;
    text-align: center;
}

/* ===================================================================
   Subpage Layout Styles (about, terms, privacy, sitemap)
   =================================================================== */
.subpage-hero {
    padding-top: 145px;
    padding-bottom: 60px;
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.05) 0%, rgba(255, 255, 255, 1) 100%);
    border-bottom: 1px solid var(--border-color);
}

.subpage-hero h1 {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--text-main);
    margin-bottom: 12px;
}

.breadcrumb-nav {
    font-size: 0.9rem;
    color: var(--text-sub);
    margin-bottom: 16px;
}

.breadcrumb-nav a {
    color: var(--primary-color);
    font-weight: 700;
}

.breadcrumb-nav span {
    margin: 0 8px;
}

.subpage-body {
    padding: 60px 0 100px;
    background-color: var(--bg-card);
}

.article-content {
    max-width: 860px;
    margin: 0 auto;
    font-size: 1.05rem;
    line-height: 1.8;
    color: #334155;
}

.article-content h2 {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--text-main);
    margin-top: 40px;
    margin-bottom: 16px;
    border-left: 4px solid var(--primary-color);
    padding-left: 14px;
}

.article-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
    margin-top: 28px;
    margin-bottom: 12px;
}

.article-content p {
    margin-bottom: 18px;
}

.article-content ul, .article-content ol {
    margin-bottom: 22px;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
    list-style: disc;
}

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

.article-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--text-sub);
    font-size: 0.9rem;
    margin-top: 14px;
    flex-wrap: wrap;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.callout {
    background-color: var(--primary-light);
    border-left: 4px solid var(--primary-color);
    padding: 20px 24px;
    border-radius: var(--radius-sm);
    margin: 28px 0;
    font-size: 0.98rem;
    color: #1e1b4b;
    line-height: 1.7;
}

.callout strong {
    color: var(--primary-color);
}

.article-faq {
    margin-top: 50px;
    border-top: 2px solid var(--border-color);
    padding-top: 36px;
}

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

.sitemap-group {
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 26px;
}

.sitemap-group h3 {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: var(--text-main);
    border-bottom: 2px solid var(--border-highlight);
    padding-bottom: 8px;
}

.sitemap-group ul li {
    margin-bottom: 10px;
    list-style: none;
}

.sitemap-group a {
    color: var(--text-main);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.sitemap-group a:hover {
    color: var(--primary-color);
}

/* ===================================================================
   Articles Section & Blog Cards
   =================================================================== */
.articles-preview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 40px;
}

.article-preview-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px 26px;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.article-preview-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-highlight);
}

.article-preview-card .article-tag {
    font-size: 0.8rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    letter-spacing: 0.3px;
}

.article-preview-card h3 {
    font-size: 1.22rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.45;
    margin-bottom: 12px;
}

.article-preview-card h3 a {
    color: inherit;
    transition: color var(--transition-fast);
}

.article-preview-card h3 a:hover {
    color: var(--primary-color);
}

.article-preview-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 22px;
    flex-grow: 1;
}

.article-preview-card .article-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.article-preview-card .article-meta-date {
    font-size: 0.82rem;
    color: var(--text-sub);
}

.article-preview-card .read-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--primary-color);
    transition: all var(--transition-fast);
}

.article-preview-card .read-more-btn:hover {
    color: var(--primary-hover);
    transform: translateX(4px);
}

/* ===================================================================
   Fade In and Out Effects (Scroll-Driven Transitions)
   =================================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s 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: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }

/* ===================================================================
   Responsive Mobile Optimization (@media)
   =================================================================== */
@media (max-width: 1080px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero .subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-trust-bar {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .articles-preview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .pricing-card.recommended {
        transform: none;
    }
    
    .pricing-card.recommended:hover {
        transform: translateY(-8px);
    }
    
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section-padding {
        padding: 64px 0;
    }
    
    .hero {
        padding-top: 115px;
        padding-bottom: 60px;
    }
    
    .hero h1 {
        font-size: 2.15rem;
    }
    
    .hero .subtitle {
        font-size: 1.05rem;
    }

    /* Mobile Navigation Drawer */
    .nav-toggle-label {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        border-bottom: 2px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 20px 24px;
        transform: translateY(-150%);
        opacity: 0;
        pointer-events: none;
        transition: transform var(--transition-normal), opacity var(--transition-normal);
    }
    
    .nav-toggle:checked ~ .nav-links {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    
    .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(1) {
        transform: translateY(7.5px) rotate(45deg);
    }
    
    .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(3) {
        transform: translateY(-7.5px) rotate(-45deg);
    }
    
    .nav-links a {
        padding: 15px 0;
        border-bottom: 1px solid var(--border-color);
        font-size: 1.05rem;
    }
    
    .nav-actions {
        flex-direction: column;
        gap: 12px;
        margin-left: 0;
        margin-top: 18px;
    }
    
    .nav-actions .btn {
        width: 100%;
        min-height: 48px;
    }

    /* Features Grid */
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .articles-preview-grid {
        grid-template-columns: 1fr;
    }
    
    .stream-ai-banner {
        flex-direction: column;
        align-items: flex-start;
        padding: 30px 24px;
    }

    /* Platforms Grid */
    .platforms-grid {
        grid-template-columns: 1fr;
    }

    /* Why Choose */
    .why-grid {
        grid-template-columns: 1fr;
    }
    
    .sitemap-links-grid {
        grid-template-columns: 1fr;
    }

    .footer-nav {
        gap: 20px;
    }
    
    .bottom-cta h2 {
        font-size: 1.85rem;
    }
}