/* CSS Variables and Global Styles */
:root {
    --bg-gradient: linear-gradient(to right, rgb(18, 194, 233), rgb(196, 113, 237), rgb(246, 79, 89));
    --text-main: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --card-bg: rgba(15, 23, 42, 0.85); /* Dark slate with opacity */
    --card-border: rgba(255, 255, 255, 0.1);
    --accent-color: #00f2fe;
    --accent-hover: #4facfe;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.2);
}

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

body {
    font-family: 'KaiTi', '楷体', STKaiti, 'Microsoft YaHei', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.text-gradient {
    background: linear-gradient(to right, #fff, #e0e0e0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 6rem 0;
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-size: 1.1rem;
}

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

.btn-primary {
    background: linear-gradient(45deg, #00c6ff, #0072ff);
    color: white;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0, 114, 255, 0.4);
    border: none;
    cursor: pointer;
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 114, 255, 0.6);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 8rem 0;
    position: relative;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.hero p {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 800px;
    margin-inline: auto;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.btn-outline {
    background: transparent;
    border: 2px solid white;
    color: white;
    padding: 10px 25px;
    border-radius: 30px;
    font-weight: bold;
    backdrop-filter: blur(5px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Advantages */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border-color: var(--accent-color);
}

.icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

/* Pricing */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    justify-content: center;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 2.5rem 2rem;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border-color: #ff9a9e;
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(255, 154, 158, 0.2);
}

.popular-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(45deg, #ff9a9e, #fecfef);
    color: #333;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.price-title {
    font-size: 1.5rem;
    color: #fecfef;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1rem;
}

.price-amount {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 2rem;
}

.price-amount span {
    font-size: 1rem;
    color: var(--text-muted);
}

.download-hint {
    background: rgba(255, 255, 255, 0.05);
    padding: 10px;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--accent-color);
}

.features-list {
    list-style: none;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.features-list li {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
}

.features-list li.warn { color: #f6d365; }
.features-list li.cross { color: #ff0844; }

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    padding: 12px;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-block:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Download Section */
.download-section {
    text-align: center;
    background: rgba(0,0,0,0.2);
}

.platforms {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.platform {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 15px;
    min-width: 150px;
    border: 1px solid var(--card-border);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    margin-bottom: 1rem;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    color: var(--text-muted);
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem;
    max-height: 200px;
}

/* Reviews */
.reviews-scroll {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding: 1rem 0;
    scrollbar-width: none;
}

.reviews-scroll::-webkit-scrollbar {
    display: none;
}

.review-card {
    min-width: 300px;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid var(--card-border);
}

.stars {
    color: #f6d365;
    margin-bottom: 1rem;
}

/* Tags & Footer */
.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 3rem;
}

.tag {
    background: rgba(255,255,255,0.1);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.tag:hover {
    background: var(--accent-color);
    color: #111;
}

footer {
    text-align: center;
    padding: 2rem 0;
    background: rgba(0,0,0,0.5);
    color: var(--text-muted);
}

/* Articles list */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

.article-card a {
    display: block;
    padding: 1.5rem;
}

.article-card:hover {
    border-color: var(--accent-hover);
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
    .pricing-card.popular { transform: scale(1); }
}