:root {
    --primary-color: #0066ff;
    --primary-hover: #0052cc;
    --bg-dark: #0b0f19;
    --bg-darker: #06090f;
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --bg-light: #f5f7fa;
    --white: #ffffff;
    --nav-height: 70px;
}

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

body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

/* Navigation - Transparent to Solid */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--nav-height);
    background-color: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    z-index: 9999;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo img {
    height: 32px;
}

.logo-text {
    font-size: 22px;
    font-weight: bold;
    color: var(--white);
    letter-spacing: 1px;
}

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

.nav-links a {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--white);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 102, 255, 0.4);
    border: none;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.6);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.3);
}

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

/* Big Screen Hero Section */
.hero-screen {
    min-height: 100vh;
    background: radial-gradient(circle at top center, #1a233a 0%, var(--bg-darker) 100%);
    padding-top: calc(var(--nav-height) + 60px);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(0, 102, 255, 0.15);
    color: #4da6ff;
    border-radius: 20px;
    font-size: 14px;
    margin-bottom: 20px;
    border: 1px solid rgba(0, 102, 255, 0.3);
}

.hero-screen h1 {
    font-size: 56px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-screen p {
    font-size: 20px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
}

.hero-downloads {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
}

.hero-image {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    transform: perspective(1000px) rotateX(2deg);
    box-shadow: 0 -20px 60px rgba(0,0,0,0.5);
    border-radius: 12px 12px 0 0;
}

.hero-image img {
    width: 100%;
    display: block;
    border-radius: 12px 12px 0 0;
}

/* User Reviews Section */
.reviews-section {
    padding: 100px 20px;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--text-main);
}

.section-subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 50px;
}

.reviews-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    background: var(--bg-light);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #eaeaec;
}

.stars {
    color: #ffb400;
    font-size: 18px;
    margin-bottom: 15px;
}

.review-text {
    font-size: 16px;
    color: var(--text-main);
    margin-bottom: 20px;
    line-height: 1.6;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.user-details h4 {
    font-size: 15px;
    margin: 0;
}

.user-details span {
    font-size: 12px;
    color: var(--text-muted);
}

/* Common Page Header */
.page-header {
    background: var(--bg-dark);
    padding: 120px 20px 60px;
    text-align: center;
    color: var(--white);
}

.page-header h1 {
    font-size: 40px;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
}

/* Standard Content Section */
.content-section {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

/* Features Grid */
.feature-box {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 80px;
}

.feature-box:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-text h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.feature-text p {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.feature-img {
    flex: 1;
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.feature-img img {
    width: 100%;
    border-radius: 8px;
}

/* Pricing */
.price-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.price-card {
    background: var(--white);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    border: 1px solid #eaeaea;
}

.price-card.hot {
    border: 2px solid var(--primary-color);
    position: relative;
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

.hot-tag {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary-color);
    color: white;
    padding: 4px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.price-card h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.price-num {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
    margin: 20px 0;
}

.price-num span {
    font-size: 16px;
    color: var(--text-muted);
    font-weight: normal;
}

.price-card ul {
    text-align: left;
    margin: 30px 0;
}

.price-card ul li {
    margin-bottom: 15px;
    padding-left: 25px;
    position: relative;
}

.price-card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Download Page */
.dl-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.dl-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid #eaeaea;
}

.dl-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.dl-card h3 {
    font-size: 22px;
    margin-bottom: 10px;
}

.dl-card p {
    color: var(--text-muted);
    margin-bottom: 25px;
    font-size: 14px;
}

/* News & Help */
.list-item {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #eaeaea;
}

.list-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.list-item p {
    color: var(--text-muted);
}

.date-tag {
    display: inline-block;
    background: var(--bg-light);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 15px;
}

/* Footer */
.footer {
    background: var(--bg-darker);
    color: rgba(255,255,255,0.6);
    padding: 60px 20px 30px;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer p {
    margin-bottom: 10px;
    font-size: 14px;
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero-screen h1 { font-size: 36px; }
    .hero-downloads { flex-direction: column; }
    .feature-box { flex-direction: column !important; }
    .price-card.hot { transform: none; }
}