/* --- Basic Reset & Global Settings --- */
:root {
    /* --- Colors --- */
    --primary-color: #f8f7ff;
    --secondary-color: #7b43d7;
    --accent-color: #f92bff;
    --accent-color-secondary: #00e0ff;
    --gradient-primary: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    --gradient-secondary: linear-gradient(135deg, #6a3ab2 0%, #8e5ae0 100%);

    --text-color-dark: #212529;
    --text-color-light: #ffffff;
    --text-color-muted: #5f6c7b;
    --heading-color-dark: #3a1c6c;
    --heading-color-light: #ffffff;

    --bg-light: #ffffff;
    --bg-dark: var(--secondary-color);
    --bg-ultra-light: var(--primary-color);

    --glow-color: rgba(249, 43, 255, 0.4);
    --border-color-soft: rgba(123, 67, 215, 0.15);
    --border-color-medium: rgba(123, 67, 215, 0.3);
    --shadow-color-light: rgba(123, 67, 215, 0.08);
    --shadow-color-medium: rgba(123, 67, 215, 0.15);

    /* --- Typography & Layout --- */
    --font-main: 'Poppins', sans-serif;
    --border-radius: 12px;
    --transition-speed: 0.3s;
    --navbar-height: 70px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--navbar-height); }
body {
    font-family: var(--font-main); background-color: var(--bg-ultra-light); color: var(--text-color-dark);
    line-height: 1.7; overflow-x: hidden; font-size: 16px;
    -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
.skip-link { position: absolute; top: -45px; left: 0; background: var(--secondary-color); color: white; padding: 8px 12px; z-index: 1100; transition: top 0.3s ease; border-bottom-right-radius: 5px; }
.skip-link:focus { top: 0; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
h1, h2, h3, h4, h5, h6 { font-weight: 700; margin-bottom: 0.7em; line-height: 1.3; }
h1 { font-size: 3.2rem; color: var(--heading-color-dark); }
h2 { font-size: 2.5rem; text-align: center; margin-bottom: 25px; color: var(--heading-color-dark); }
h3 { font-size: 1.5rem; color: var(--heading-color-dark); margin-bottom: 15px; font-weight: 600; }
p { margin-bottom: 1.2em; color: var(--text-color-muted); }
a { color: var(--secondary-color); text-decoration: none; transition: color var(--transition-speed) ease; }
a:hover { color: var(--accent-color); }
.section-padding { padding: 100px 0; }
.section-subtitle { text-align: center; color: var(--text-color-muted); margin-top: -15px; margin-bottom: 60px; font-size: 1.1rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.light-bg { background-color: var(--bg-light); }
.dark-bg { background-color: var(--bg-dark); color: var(--text-color-light); }
.dark-bg h2, .dark-bg h3 { color: var(--heading-color-light); }
.dark-bg p, .dark-bg .section-subtitle { color: rgba(255, 255, 255, 0.85); }
.dark-bg a { color: var(--accent-color-secondary); }
.dark-bg a:hover { color: #fff; }

/* --- Navbar --- */
.navbar {
    background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    padding: 0; position: fixed; width: 100%; top: 0; left: 0; z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05); border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    height: var(--navbar-height); transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.navbar.scrolled { background: rgba(255, 255, 255, 0.95); box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08); }
.navbar .container { display: flex; justify-content: space-between; align-items: center; height: 100%; }
.navbar .logo { font-size: 1.7rem; font-weight: 700; color: var(--heading-color-dark); display: flex; align-items: center; }
.beta-tag { font-size: 0.7rem; background: var(--gradient-primary); color: #fff; padding: 2px 6px; border-radius: 4px; margin-left: 8px; font-weight: 600; line-height: 1; }
.navbar .nav-links { list-style: none; display: flex; align-items: center; margin: 0; padding: 0; }
.navbar .nav-links li { margin-left: 30px; /* Adjusted */ }
.navbar .nav-links li a {
    color: var(--text-color-dark); padding: 8px 0; font-weight: 500; position: relative;
    transition: color var(--transition-speed) ease; font-size: 0.95rem; /* Adjusted */ white-space: nowrap; /* Adjusted */
}
.navbar .nav-links li a::after { content: ''; position: absolute; width: 0; height: 2px; bottom: -4px; left: 0; background-color: var(--accent-color); transition: width var(--transition-speed) ease; }
.navbar .nav-links li a:hover, .navbar .nav-links li a.active { color: var(--secondary-color); }
.navbar .nav-links li a:hover::after, .navbar .nav-links li a.active::after{ width: 100%; }
.nav-cta { margin-left: 30px; padding: 9px 22px !important; font-size: 0.85rem; font-weight: 600; border-radius: 50px; border: 2px solid var(--secondary-color); color: var(--secondary-color); background-color: transparent; transition: all var(--transition-speed) ease; }
.nav-cta:hover { background-color: var(--secondary-color); color: var(--text-color-light) !important; transform: translateY(-2px); box-shadow: 0 6px 15px var(--shadow-color-light); }

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none; background: none; border: none; font-size: 1.8rem; color: var(--heading-color-dark);
    cursor: pointer; padding: 5px; line-height: 1; z-index: 1001; position: relative;
}
.mobile-menu-toggle .icon-close { display: none; }
.mobile-menu-toggle.active .icon-menu { display: none; }
.mobile-menu-toggle.active .icon-close { display: block; }

/* --- Hero Section --- */
.hero-section {
    min-height: 100vh; display: flex; align-items: center; padding-top: var(--navbar-height); padding-bottom: 80px;
    background-color: var(--primary-color); position: relative; overflow: hidden;
}
.hero-container { display: flex; align-items: center; gap: 40px; }
.hero-content { flex: 1; z-index: 2; padding-right: 30px; }
.hero-content h1 { font-size: 3.2rem; line-height: 1.25; margin-bottom: 25px; }
.hero-content .subtitle { font-size: 1.2rem; margin-bottom: 40px; color: var(--text-color-muted); max-width: 550px; }
.hero-cta-group { display: flex; flex-wrap: wrap; gap: 15px; align-items: center; }
.hero-visual { flex: 1; display: flex; justify-content: center; align-items: center; z-index: 1; }

/* Phone Mockup Style */
.phone-mockup {
    position: relative; max-width: 300px; margin: 0 auto; border-radius: 30px; 
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2), inset 0 2px 4px rgba(255, 255, 255, 0.1);
}
.phone-mockup::before { content: ''; position: absolute; top: 12px; left: 50%; transform: translateX(-50%); width: 60px; height: 10px; background: #000; border-radius: 5px; z-index: 2; }
.phone-mockup img { display: block; width: 100%; height: auto; border-radius: 20px; object-fit: cover; }
.phone-mockup.modern { padding: 8px; border-radius: 25px; }
.phone-mockup.modern::before { display: none; }
.phone-mockup.modern img { border-radius: 18px; }

/* Hero Shape Divider */
.hero-shape-divider { position: absolute; bottom: -1px; left: 0; width: 100%; overflow: hidden; line-height: 0; z-index: 0; }
.hero-shape-divider svg { position: relative; display: block; width: calc(100% + 1.3px); height: 80px; }
.hero-shape-divider .shape-fill { fill: var(--bg-light); }

/* --- CTA Buttons --- */
.cta-button, .cta-button-outline {
    display: inline-flex; align-items: center; justify-content: center; padding: 14px 32px; border-radius: 50px;
    font-weight: 600; font-size: 1rem; text-transform: uppercase; letter-spacing: 0.5px; border: 2px solid transparent;
    cursor: pointer; transition: all var(--transition-speed) ease; text-align: center; white-space: nowrap; line-height: 1.5;
}
.cta-button { background: var(--gradient-primary); color: var(--text-color-light); box-shadow: 0 8px 20px var(--shadow-color-medium); }
.cta-button:hover { transform: translateY(-3px); box-shadow: 0 12px 25px var(--glow-color); }
.cta-button-outline { background-color: transparent; border-color: var(--secondary-color); color: var(--secondary-color); }
.cta-button-outline:hover { background-color: var(--secondary-color); color: var(--text-color-light); transform: translateY(-2px); box-shadow: 0 6px 15px var(--shadow-color-light); }
.cta-button i, .cta-button-outline i { margin-right: 8px; font-size: 0.9em; }

/* --- Purchase Ticker --- */
.purchase-ticker-section { background-color: #ede7f6; padding: 15px 0; border-top: 1px solid var(--border-color-soft); border-bottom: 1px solid var(--border-color-soft); overflow: hidden;}
.ticker-wrap { width: 100%; }
.ticker { display: inline-block; white-space: nowrap; animation: ticker-scroll 45s linear infinite; will-change: transform; }
.ticker-item { display: inline-block; padding: 0 2rem; color: var(--text-color-muted); font-size: 0.9rem; }
.ticker-item i { color: var(--secondary-color); margin-right: 6px; font-size: 0.85rem; }
@keyframes ticker-scroll { 0% { transform: translateX(0%); } 100% { transform: translateX(-100%); } }
.ticker-wrap:hover .ticker { animation-play-state: paused; }

/* --- Features Section --- */
.features-section { background-color: var(--bg-light); }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; margin-top: 50px; }
.feature-item {
    background-color: #fff; padding: 35px; border-radius: var(--border-radius); text-align: center;
    border: 1px solid var(--border-color-soft); box-shadow: 0 6px 18px var(--shadow-color-light);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.feature-item:hover { transform: translateY(-8px); box-shadow: 0 12px 25px var(--shadow-color-medium); }
.feature-icon-wrapper { width: 65px; height: 65px; margin: 0 auto 20px; border-radius: 50%; background: var(--gradient-primary); display: flex; justify-content: center; align-items: center; box-shadow: 0 5px 10px var(--shadow-color-medium); }
.feature-icon { font-size: 1.8rem; color: var(--text-color-light); }
.feature-item h3 { font-size: 1.3rem; margin-bottom: 10px; }
.feature-item p { font-size: 0.9rem; color: var(--text-color-muted); }

/* --- Data Engine Section --- */
.data-engine-section { background-color: var(--bg-light); }
.data-engine-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 35px; margin-top: 50px; }
.engine-item {
    text-align: center; padding: 35px 30px; background-color: #fff; border-radius: var(--border-radius);
    border: 1px solid var(--border-color-soft); box-shadow: 0 5px 15px var(--shadow-color-light);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}
.engine-item:hover { transform: translateY(-6px); box-shadow: 0 10px 20px var(--shadow-color-medium); }
.engine-icon-wrapper { width: 70px; height: 70px; margin: 0 auto 25px; border-radius: 15px; background: var(--gradient-secondary); display: flex; justify-content: center; align-items: center; box-shadow: 0 4px 8px rgba(106, 58, 178, 0.2); }
.engine-icon { font-size: 2rem; color: var(--text-color-light); }
.engine-item h3 { font-size: 1.4rem; margin-bottom: 12px; color: var(--heading-color-dark); }
.engine-item p { font-size: 0.95rem; color: var(--text-color-muted); }

/* --- Showcase Section --- */
.showcase-section { background-color: var(--bg-ultra-light); }
.showcase-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 40px; margin-top: 50px; }
.showcase-item { text-align: center; }
.showcase-item .phone-mockup { max-width: 320px; margin-bottom: 20px; transition: transform var(--transition-speed) ease; box-shadow: 0 10px 30px var(--shadow-color-light); }
.showcase-item:hover .phone-mockup { transform: scale(1.03); }
.showcase-caption { color: var(--text-color-muted); font-weight: 500; margin-top: 5px; }

/* --- Pricing Section --- */
.pricing-section { background: linear-gradient(to bottom, var(--primary-color) 0%, #e8e0ff 100%); }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 50px; align-items: stretch; }
.pricing-card {
    background-color: var(--bg-light); padding: 40px 30px; border-radius: var(--border-radius);
    border: 1px solid var(--border-color-soft); box-shadow: 0 8px 25px var(--shadow-color-light);
    display: flex; flex-direction: column; transition: all var(--transition-speed) ease;
    position: relative; overflow: hidden;
}
.pricing-card:hover { transform: translateY(-10px); box-shadow: 0 15px 35px var(--shadow-color-medium); }
.pricing-card .card-header { text-align: center; margin-bottom: 30px; }
.card-icon { font-size: 2.5rem; color: var(--secondary-color); margin-bottom: 15px; display: block; }
.pricing-card h3 { font-size: 1.6rem; margin-bottom: 5px; }
.pricing-card .card-header p { font-size: 0.9rem; color: var(--text-color-muted); }
.card-price { text-align: center; margin-bottom: 30px; }
.card-price .amount { font-size: 2.8rem; font-weight: 700; color: var(--heading-color-dark); }
.card-price .duration { font-size: 1rem; color: var(--text-color-muted); }
.card-features { list-style: none; padding: 0; margin-bottom: 40px; flex-grow: 1; }
.card-features li { display: flex; align-items: center; margin-bottom: 12px; font-size: 0.95rem; color: var(--text-color-dark); }
.card-features li i { width: 20px; text-align: center; margin-right: 10px; font-size: 1.1rem; flex-shrink: 0; }
.card-features li i.fa-check { color: #28a745; }
.card-features li i.fa-times { color: #dc3545; }
.card-cta { width: 100%; margin-top: auto; }

/* Recommended Card Style */
.pricing-card.recommended { border: 3px solid var(--secondary-color); transform: scale(1.05); z-index: 1; }
.pricing-card.recommended:hover { transform: scale(1.08) translateY(-10px); }
.recommended-badge { position: absolute; top: 15px; right: -35px; background: var(--gradient-primary); color: #fff; padding: 5px 30px; font-size: 0.8rem; font-weight: 600; transform: rotate(45deg); transform-origin: center center; box-shadow: 0 3px 8px rgba(0,0,0,0.1); width: 120px; text-align: center; }
.pricing-card.recommended .card-icon { color: var(--accent-color); }
.pricing-note { text-align: center; margin-top: 40px; font-size: 0.9rem; color: var(--text-color-muted); }

/* --- Experience Section --- */
.experience-section { background-color: var(--bg-light); }
.experience-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 50px; align-items: start; }
.experience-section h3 { margin-top: 15px; font-size: 1.4rem; }
.experience-icon { font-size: 3rem; color: var(--accent-color); display: block; margin-bottom: 10px; }
.link-arrow { color: var(--secondary-color); font-weight: 600; display: inline-block; margin-top: 10px; }
.link-arrow i { margin-left: 5px; transition: transform var(--transition-speed) ease; }
.link-arrow:hover i { transform: translateX(5px); }

/* --- Activation Section --- */
.activation-section { background-color: var(--bg-dark); color: var(--text-color-light); }
.activation-section h2, .activation-section .section-subtitle { color: var(--text-color-light); }
.activation-section h2::after { background: linear-gradient(90deg, transparent, var(--accent-color-secondary), transparent); }
.activation-form { display: flex; justify-content: center; align-items: center; gap: 15px; max-width: 650px; margin: 40px auto 0 auto; }
.activation-form input[type="text"] {
    flex-grow: 1; padding: 16px 25px; border: 1px solid rgba(255, 255, 255, 0.3);
    background-color: rgba(255, 255, 255, 0.1); color: var(--text-color-light);
    border-radius: 50px; font-size: 1.1rem; outline: none; transition: all var(--transition-speed) ease;
}
.activation-form input[type="text"]::placeholder { color: rgba(255, 255, 255, 0.6); }
.activation-form input[type="text"]:focus { border-color: var(--accent-color-secondary); background-color: rgba(255, 255, 255, 0.15); box-shadow: 0 0 15px rgba(0, 224, 255, 0.4); }
.activation-form button { padding: 16px 35px; flex-shrink: 0; background: var(--gradient-secondary); }
.activation-result {
    margin-bottom: 25px; /* Display result ABOVE form */
    padding: 15px 20px; background-color: rgba(255, 255, 255, 0.08); border-radius: var(--border-radius);
    text-align: center; min-height: 55px; border: 1px dashed rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.8); font-size: 1rem; transition: all var(--transition-speed) ease;
    order: -1; /* Ensure visually above form if using flex */
}
.activation-result.success { color: #a5d6a7; border-color: #a5d6a7; background-color: rgba(165, 214, 167, 0.1); }
.activation-result.error { color: #ef9a9a; border-color: #ef9a9a; background-color: rgba(239, 154, 154, 0.1); }
.activation-result.info { color: rgba(255, 255, 255, 0.8); border-color: rgba(255, 255, 255, 0.3); }
.activation-result.warning { color: #ffcc80; border-color: #ffcc80; background-color: rgba(255, 204, 128, 0.1); }

/* --- Reviews Section --- */
.reviews-section { background-color: var(--bg-ultra-light); }
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; margin-top: 50px; }
.review-item {
    background-color: var(--bg-light); padding: 30px; border-radius: var(--border-radius);
    border: 1px solid var(--border-color-soft); box-shadow: 0 8px 25px var(--shadow-color-light);
    transition: all var(--transition-speed) ease; display: flex; flex-direction: column;
}
.review-item:hover { transform: translateY(-8px); box-shadow: 0 15px 30px var(--shadow-color-medium); }
.review-header { display: flex; align-items: center; margin-bottom: 20px; flex-shrink: 0; }
.avatar { width: 55px; height: 55px; border-radius: 50%; margin-right: 15px; object-fit: cover; border: 2px solid var(--border-color-soft); }
.author { font-weight: 600; color: var(--heading-color-dark); margin-bottom: 2px; line-height: 1.2; }
.stars { color: #ffc107; font-size: 0.9rem; }
.review-item blockquote {
    font-style: italic; margin: 0; padding-left: 20px; border-left: 3px solid var(--secondary-color);
    color: var(--text-color-muted); font-size: 0.95rem; line-height: 1.6; flex-grow: 1;
}
.review-item blockquote p { margin-bottom: 0; }

/* --- Footer Section --- */
.footer-section { background-color: var(--heading-color-dark); color: rgba(255, 255, 255, 0.8); padding-top: 80px; }
.footer-container { text-align: center; }
.footer-cta { margin-bottom: 60px; padding: 40px; background-color: rgba(255,255,255, 0.05); border-radius: var(--border-radius); }
.footer-cta h2 { color: var(--text-color-light); font-size: 2.2rem; margin-bottom: 15px; }
.footer-cta p { color: rgba(255, 255, 255, 0.8); margin-bottom: 30px; font-size: 1.1rem; }
.contact-methods { display: flex; flex-direction: column; align-items: center; gap: 20px; }
.contact-button { background: var(--gradient-primary); }
.or-divider { font-weight: 600; color: rgba(255, 255, 255, 0.6); }
.wechat-info p { margin-bottom: 8px; font-size: 0.9rem; color: rgba(255, 255, 255, 0.7); }
.footer-qr-code { max-width: 120px; height: auto; background: #fff; padding: 8px; border-radius: 8px; margin-bottom: 8px; }
.wechat-id {
    font-size: 0.85rem; font-weight: 600; color: #fff; cursor: pointer; position: relative;
    background: none; border: none; padding: 5px; display: inline-block; margin-top: 5px;
}
.wechat-id::after {
    content: '点击复制'; position: absolute; bottom: 110%; left: 50%; transform: translateX(-50%);
    background-color: rgba(0,0,0,0.7); color: #fff; padding: 3px 6px; border-radius: 4px;
    font-size: 0.75rem; white-space: nowrap; opacity: 0; visibility: hidden; transition: opacity 0.2s ease; pointer-events: none;
}
.wechat-id:hover::after { opacity: 1; visibility: visible; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 30px 0; font-size: 0.85rem; color: rgba(255, 255, 255, 0.6); }
.footer-bottom p { margin-bottom: 5px; }
.footer-bottom a { color: rgba(255, 255, 255, 0.6); margin: 0 8px; }
.footer-bottom a:hover { color: var(--accent-color-secondary); }

/* --- Right Sidebar (PC) --- */
.sidebar { position: fixed; right: 25px; bottom: 30px; z-index: 999; display: flex; flex-direction: column; gap: 12px; }
.sidebar-item { position: relative; }
.sidebar-icon-btn {
    width: 52px; height: 52px; background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    border-radius: 50%; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1); display: flex; justify-content: center; align-items: center;
    cursor: pointer; border: none; transition: all var(--transition-speed) ease;
}
.sidebar-icon-btn:hover { background-color: #fff; transform: scale(1.1); box-shadow: 0 8px 20px var(--shadow-color-medium); }
.sidebar-icon-btn i { font-size: 1.5rem; color: var(--secondary-color); transition: color var(--transition-speed) ease; }
.sidebar-icon-btn:hover i { color: var(--accent-color); }

/* WeChat Popup in Sidebar */
.wechat-popup {
    position: absolute; bottom: 100%; right: 0; margin-bottom: 10px; background-color: #fff; padding: 15px;
    border-radius: var(--border-radius); box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15); width: 180px; text-align: center;
    opacity: 0; visibility: hidden; transform: translateY(10px);
    transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease, transform var(--transition-speed) ease;
    border: 1px solid var(--border-color-soft); pointer-events: none;
}
.sidebar-item.wechat-contact.active .wechat-popup { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.wechat-popup img { max-width: 130px; height: auto; display: block; margin: 0 auto 10px auto; }
.wechat-popup span { display: block; font-size: 0.8rem; color: var(--text-color-muted); margin-bottom: 10px; }
.quick-add-btn {
    display: inline-flex; align-items: center; justify-content: center; font-size: 0.85rem; padding: 6px 12px;
    background: var(--gradient-primary); color: #fff; border-radius: 5px; text-decoration: none; width: 100%;
    border: none; cursor: pointer; transition: background 0.3s ease;
}
.quick-add-btn:hover { background: var(--gradient-secondary); }
.quick-add-btn i { margin-right: 5px; }

/* Back to Top Button */
.back-to-top { opacity: 0; visibility: hidden; transform: translateY(15px); transition: all var(--transition-speed) ease; }
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top[hidden] { display: none !important; }

/* --- Promo Popup --- */
.promo-popup {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); display: flex; justify-content: center; align-items: center;
    z-index: 1010; opacity: 0; visibility: hidden; transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease;
    padding: 20px; /* Add padding for smaller screens */
}
.promo-popup[hidden] { display: none !important; }
.promo-popup.active { opacity: 1; visibility: visible; }
.popup-content {
    position: relative; background-color: transparent; padding: 0; border-radius: var(--border-radius);
    max-width: 500px; /* Max width on larger screens */
    width: auto; /* Let image determine width, up to max-width */
    max-height: 90vh; /* Prevent vertical overflow */
    text-align: center; transform: scale(0.8);
    transition: transform 0.35s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    overflow: hidden; /* Hide potential image overflow before animation */
    display: inline-block; /* Allow centering */
}
.promo-popup.active .popup-content { transform: scale(1); }
.popup-content img { display: block; max-width: 100%; height: auto; border-radius: var(--border-radius); object-fit: contain; max-height: calc(90vh - 80px); }
.popup-close-btn {
    position: absolute; top: -10px; right: -10px; width: 35px; height: 35px; background-color: rgba(0,0,0,0.7);
    color: #fff; border: none; border-radius: 50%; font-size: 1.8rem; line-height: 1; cursor: pointer;
    transition: background-color var(--transition-speed) ease, transform 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3); display: flex; justify-content: center; align-items: center; padding: 0;
    z-index: 1011;
}
.popup-close-btn:hover { background-color: rgba(0,0,0,0.9); transform: scale(1.1); }
.popup-cta { margin-top: -50px; position: relative; z-index: 2; }


/* --- Activity/Gift Button (Sidebar Item) --- */
#floating-action-btn {
    /* Inherits .sidebar-item and .sidebar-icon-btn styles */
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8); /* Initial hidden state */
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
    background: var(--gradient-primary); /* Distinct background */
}
#floating-action-btn i {
    color: #fff; /* Icon color on gradient */
}
#floating-action-btn[hidden] { display: none !important; }
#floating-action-btn.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1); /* Visible state */
}
/* Hover state is handled by .sidebar-icon-btn:hover */


/* --- Responsive Popup Adjustments --- */
@media (max-width: 768px) {
    .promo-popup .popup-content {
        max-width: calc(100% - 30px); /* Ensure padding */
        /* width: auto; */ /* Already default */
        max-height: 85vh; /* Adjust max height */
    }
     .promo-popup .popup-content img {
        max-height: calc(85vh - 80px); /* Adjust image max height */
    }
    .promo-popup .popup-close-btn {
        top: 5px; right: 5px; /* Position inside padding */
        width: 30px; height: 30px; font-size: 1.5rem; line-height: 1;
        background-color: rgba(255, 255, 255, 0.8); /* Lighter close button */
        color: #333;
        box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    }
    .promo-popup .popup-close-btn:hover {
        background-color: #fff;
    }
    .promo-popup .popup-cta {
        font-size: 0.9rem; padding: 12px 25px; margin-top: -30px; /* Adjust overlap */
    }
}
/* --- Responsive Design --- */
@media (max-width: 1200px) {
    .container { max-width: 960px; }
    .navbar .nav-links li { margin-left: 25px; }
    .navbar .nav-links li a { font-size: 0.9rem; }
    .nav-cta { margin-left: 25px; padding: 8px 20px !important; font-size: 0.8rem; }
}

@media (max-width: 992px) {
    .container { max-width: 720px; }
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2.2rem; }
    .hero-container { flex-direction: column; text-align: center; padding-top: 40px;}
    .hero-content { padding-right: 0; order: 2; }
    .hero-visual { order: 1; margin-bottom: 30px; }
    .hero-content .subtitle { margin-left: auto; margin-right: auto; font-size: 1.1rem; }
    .hero-cta-group { justify-content: center; }
    .features-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .data-engine-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .showcase-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .pricing-grid { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
    .experience-container { grid-template-columns: 1fr; text-align: center; }
    .reviews-grid { grid-template-columns: 1fr; }
}

/* Mobile Styles */
@media (max-width: 768px) {
    :root { --navbar-height: 60px; }
    .container { padding: 0 15px; }
    h1 { font-size: 2.4rem; }
    h2 { font-size: 2rem; margin-bottom: 40px; }
    .section-padding { padding: 70px 0; }
    .section-subtitle { font-size: 1rem; margin-bottom: 40px; }

    /* Mobile Menu Styles */
    .nav-links {
        position: fixed; top: var(--navbar-height); left: 0; width: 100%; height: calc(100vh - var(--navbar-height));
        background-color: rgba(255, 255, 255, 0.98); backdrop-filter: blur(5px); -webkit-backdrop-filter: blur(5px);
        display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
        padding-top: 40px; transform: translateX(100%); transition: transform 0.35s ease-in-out;
        z-index: 999; overflow-y: auto; gap: 15px;
    }
    .nav-links.mobile-active { transform: translateX(0); }
    .nav-links li { margin-left: 0; width: 85%; text-align: center; }
    .nav-links li a { display: block; padding: 18px 0; font-size: 1.15rem; font-weight: 500; border-bottom: 1px solid var(--border-color-soft); }
    .nav-links li a::after { display: none; }
    .nav-links .nav-cta { margin-left: 0; margin-top: 25px; width: 85%; padding: 16px 20px !important; }
    .mobile-menu-toggle { display: block; }
    body.no-scroll { overflow: hidden; }

    .hero-section { min-height: auto; padding-bottom: 60px; }
    .phone-mockup { max-width: 260px; }
    .hero-shape-divider svg { height: 60px; }

    .activation-form { flex-direction: column; gap: 15px; }
    .activation-form input[type="text"] { width: 100%; font-size: 1rem; padding: 14px 20px;}
    .activation-form button { width: 100%; }

    .footer-cta { padding: 30px 20px; }
    .footer-cta h2 { font-size: 1.8rem; }
    .contact-methods { width: 100%; }
    .contact-button { width: 100%; max-width: 300px; }
    .wechat-info { width: 100%; }

    .sidebar { display: none; } /* Hide PC sidebar */

    /* Popup Adjustments for mobile */
    .promo-popup .popup-content {
        max-width: calc(100% - 30px); /* Ensure padding */
        width: auto; /* Let content determine width */
        max-height: 85vh; /* Adjust max height */
    }
     .promo-popup .popup-content img {
        max-height: calc(85vh - 80px); /* Adjust image max height */
    }
    .promo-popup .popup-close-btn {
        top: 10px; right: 10px; /* Position inside padding */
        width: 30px; height: 30px; font-size: 1.5rem; line-height: 1;
        background-color: rgba(255, 255, 255, 0.8); /* Lighter close button on mobile */
        color: #333;
        box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    }
    .promo-popup .popup-close-btn:hover {
        background-color: #fff;
    }
    .promo-popup .popup-cta { font-size: 0.9rem; padding: 12px 25px; margin-top: -30px; /* Adjust overlap */ }

    /* Activity/Gift button is hidden via sidebar */
}

@media (max-width: 576px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.8rem; }
    .hero-content .subtitle { font-size: 0.95rem; }
    .cta-button, .cta-button-outline { padding: 12px 25px; font-size: 0.9rem;}
    .features-grid, .data-engine-grid, .showcase-grid, .pricing-grid { grid-template-columns: 1fr; }
    .pricing-card.recommended { transform: scale(1); }
    .pricing-card.recommended:hover { transform: translateY(-10px); }
    .review-item { padding: 25px; }
    .review-header { flex-direction: column; align-items: flex-start; }
    .avatar { margin-bottom: 10px; }
    .footer-cta h2 { font-size: 1.6rem; }
    .experience-container div { text-align: center; }
}
/* --- Right Sidebar (PC) --- */
.sidebar {
    position: fixed; right: 25px; bottom: 30px; z-index: 999;
    display: flex; flex-direction: column; gap: 12px;
}
.sidebar-item { position: relative; }
.sidebar-icon-btn {
    width: 52px; height: 52px; background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    border-radius: 50%; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    display: flex; justify-content: center; align-items: center;
    cursor: pointer; border: none; transition: all var(--transition-speed) ease;
}
.sidebar-icon-btn:hover { background-color: #fff; transform: scale(1.1); box-shadow: 0 8px 20px var(--shadow-color-medium); }
.sidebar-icon-btn i { font-size: 1.5rem; color: var(--secondary-color); transition: color var(--transition-speed) ease; }
.sidebar-icon-btn:hover i { color: var(--accent-color); }

/* Back to Top Button specific styles */
.back-to-top { opacity: 0; visibility: hidden; transform: translateY(15px); transition: all var(--transition-speed) ease; }
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top[hidden] { display: none !important; }


/* --- Promo Popup --- */
.promo-popup {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); display: flex; justify-content: center; align-items: center;
    z-index: 1010; opacity: 0; visibility: hidden; transition: opacity var(--transition-speed) ease, visibility var(--transition-speed) ease;
    padding: 20px;
}
.promo-popup[hidden] { display: none !important; }
.promo-popup.active { opacity: 1; visibility: visible; }
.popup-content {
    position: relative; background-color: transparent; padding: 0; border-radius: var(--border-radius);
    max-width: 500px; width: auto; max-height: 90vh; text-align: center; transform: scale(0.8);
    transition: transform 0.35s cubic-bezier(0.18, 0.89, 0.32, 1.28); overflow: hidden; display: inline-block;
}
.promo-popup.active .popup-content { transform: scale(1); }
.popup-content img { display: block; max-width: 100%; height: auto; border-radius: var(--border-radius); object-fit: contain; max-height: calc(90vh - 80px); }
.popup-close-btn {
    position: absolute; top: -10px; right: -10px; width: 35px; height: 35px; background-color: rgba(0,0,0,0.7);
    color: #fff; border: none; border-radius: 50%; font-size: 1.8rem; line-height: 1; cursor: pointer;
    transition: background-color var(--transition-speed) ease, transform 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3); display: flex; justify-content: center; align-items: center; padding: 0;
    z-index: 1011;
}
.popup-close-btn:hover { background-color: rgba(0,0,0,0.9); transform: scale(1.1); }
.popup-cta { margin-top: -50px; position: relative; z-index: 2; }

/* --- Activity/Gift Button (Sidebar Item) --- */
#floating-action-btn { /* This ID identifies the button */
    /* Inherits .sidebar-item and .sidebar-icon-btn styles */
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8); /* Initial hidden state */
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
    background: var(--gradient-primary); /* Distinct background */
}
#floating-action-btn i { color: #fff; }
#floating-action-btn[hidden] { display: none !important; }
#floating-action-btn.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1); /* Visible state */
}
/* Hover state is inherited from .sidebar-icon-btn:hover */

/* --- Responsive Popup Adjustments --- */
@media (max-width: 768px) {
    .promo-popup .popup-content { max-width: calc(100% - 30px); max-height: 85vh; }
    .promo-popup .popup-content img { max-height: calc(85vh - 80px); }
    .promo-popup .popup-close-btn { top: 5px; right: 5px; width: 30px; height: 30px; font-size: 1.5rem; background-color: rgba(255, 255, 255, 0.8); color: #333; box-shadow: 0 1px 4px rgba(0,0,0,0.2); }
    .promo-popup .popup-close-btn:hover { background-color: #fff; }
    .promo-popup .popup-cta { font-size: 0.9rem; padding: 12px 25px; margin-top: -30px; }
    .sidebar { display: none; } /* Hides sidebar and thus the activity button on mobile */
}

/* Other styles... */
.review-item .review-header img {
  width: 50px;         /* 设置期望的宽度 (或只设置 height) */
  height: auto;        /* 让高度自动计算 */
  aspect-ratio: 1 / 1; /* 强制宽高比为 1:1，即正方形 */
  border-radius: 50%;  /* 设置圆角半径为圆形 */
  object-fit: cover;   /* 同样重要，裁剪图片以适应圆形 */
  display: block;
}