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

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f7f9;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

a:focus-visible {
    outline: 3px solid rgba(0, 86, 255, 0.25);
    outline-offset: 3px;
}

/* ================= Header ================= */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: #0056ff;
}

.logo img {
    width: 48px;
    height: 48px;
    margin-right: 12px;
}

nav ul {
    display: flex;
    gap: 35px;
}

nav a {
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s ease;
}

nav a:hover,
nav a.active {
    color: #0056ff;
}

/* ================= Hero ================= */
.hero {
    background: linear-gradient(135deg, #001f5c, #0056ff);
    color: #ffffff;
    text-align: center;
    padding: 120px 20px;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    font-size: 52px;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero p {
    font-size: 18px;
    max-width: 800px;
    margin: 0 auto 15px;
    line-height: 1.8;
    color: #e6f0ff;
}

.hero strong {
    color: #ffd700;
    font-weight: 600;
}

.cta-buttons {
    margin-top: 45px;
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.hero-tags {
    margin-top: 32px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
}

.hero-tags span {
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    font-size: 14px;
    backdrop-filter: blur(8px);
}

.btn-primary,
.btn-secondary,
.btn-primary-large {
    padding: 16px 36px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background: #ffffff;
    color: #0056ff;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
    background: #f0f5ff;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background: transparent;
    border: 2px solid #ffffff;
    color: #ffffff;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

/* ================= Shared Sections ================= */
section {
    padding: 90px 5%;
    text-align: center;
}

section h2 {
    font-size: 36px;
    margin-bottom: 50px;
    color: #1a1a1a;
    font-weight: 700;
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: 999px;
    background: #eaf2ff;
    color: #0056ff;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 18px;
}

/* ================= Overview Stats ================= */
.status-overview {
    background: #ffffff;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    max-width: 1140px;
    margin: 0 auto;
}

.stat-card {
    background: #f8faff;
    border-radius: 18px;
    padding: 34px 24px;
    box-shadow: 0 10px 30px rgba(0, 86, 255, 0.05);
}

.stat-card strong {
    display: block;
    margin-bottom: 12px;
    font-size: 40px;
    line-height: 1;
    color: #0056ff;
}

.stat-card p {
    color: #5f6b7a;
    font-size: 15px;
    line-height: 1.8;
}

/* ================= Features ================= */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-item {
    background: #ffffff;
    padding: 45px 30px;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 86, 255, 0.1);
}

.feature-item img {
    width: 96px;
    height: 96px;
    margin: 0 auto 25px;
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #222;
}

.feature-item p {
    color: #666;
    font-size: 15px;
    line-height: 1.7;
    text-align: justify;
}

/* ================= Preview Blocks ================= */
.preview-section,
.download-visual {
    background: #f4f7f9;
}

.preview-shell {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: 42px;
    text-align: left;
}

.preview-image img {
    width: 100%;
    border-radius: 28px;
    box-shadow: 0 22px 55px rgba(0, 31, 92, 0.14);
}

.preview-copy h2 {
    margin-bottom: 20px;
    text-align: left;
    line-height: 1.3;
}

.preview-copy p {
    color: #5f6b7a;
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 22px;
}

.check-list {
    display: grid;
    gap: 14px;
}

.check-list li {
    position: relative;
    padding-left: 28px;
    color: #4f5d6f;
    font-size: 15px;
    line-height: 1.7;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    top: 0;
    left: 0;
    color: #0056ff;
    font-weight: 700;
}

/* ================= Pricing ================= */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 40px auto 0;
    align-items: center;
}

.card {
    background: #ffffff;
    padding: 50px 30px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid #eef2f6;
}

.card.premium {
    transform: scale(1.05);
    background: #0056ff;
    color: #ffffff;
    box-shadow: 0 15px 40px rgba(0, 86, 255, 0.3);
    border: none;
    position: relative;
    z-index: 2;
}

.card h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.price {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 30px;
}

.price span {
    font-size: 16px;
    font-weight: normal;
}

.card ul {
    text-align: left;
    margin-bottom: 40px;
}

.card ul li {
    margin-bottom: 18px;
    font-size: 15px;
    padding-left: 28px;
    position: relative;
    color: #555;
}

.card.premium ul li {
    color: #e6f0ff;
}

.card ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #0056ff;
    font-weight: bold;
    font-size: 18px;
}

.card.premium ul li::before {
    color: #ffffff;
}

.btn-buy {
    display: block;
    width: 100%;
    padding: 16px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    background: #f0f5ff;
    color: #0056ff;
    transition: all 0.3s ease;
}

.btn-buy:hover {
    background: #0056ff;
    color: #ffffff;
}

.card.premium .btn-buy {
    background: #ffffff;
    color: #0056ff;
}

.card.premium .btn-buy:hover {
    background: #e6f0ff;
}

/* ================= Reviews ================= */
.reviews {
    background: #ffffff;
}

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

.review-item {
    padding: 40px 30px;
    background: #f8faff;
    border-radius: 16px;
    text-align: left;
}

.review-item img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin-bottom: 20px;
    border: 2px solid #e6f0ff;
}

.review-item p {
    font-style: italic;
    color: #444;
    margin-bottom: 25px;
    line-height: 1.8;
}

.review-item h4 {
    font-size: 15px;
    color: #111;
    text-align: right;
    font-weight: 600;
}

/* ================= FAQ ================= */
.faq-item {
    text-align: left;
    background: #ffffff;
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.faq-item h3 {
    font-size: 18px;
    color: #111;
    margin-bottom: 15px;
    font-weight: 600;
}

.faq-item p {
    color: #666;
    line-height: 1.7;
}

/* ================= Download Page ================= */
.download-guide {
    background: #ffffff;
    padding-top: 60px;
    padding-bottom: 40px;
}

.download-guide h1 {
    font-size: 44px;
    color: #111;
}

.alert-box {
    max-width: 820px;
    margin: 40px auto 0;
    background: #fff8e6;
    border-left: 6px solid #ffb800;
    padding: 35px;
    border-radius: 12px;
    text-align: left;
}

.alert-box h2 {
    font-size: 22px;
    color: #b28000;
    margin-bottom: 20px;
    text-align: left;
}

.alert-box h3 {
    font-size: 18px;
    margin: 25px 0 10px;
    color: #222;
}

.alert-box p {
    color: #555;
    margin-bottom: 20px;
    line-height: 1.7;
}

.btn-primary-large {
    background: #ff4757;
    color: #ffffff;
    padding: 16px 45px;
    font-size: 18px;
    border-radius: 10px;
    font-weight: bold;
    box-shadow: 0 6px 20px rgba(255, 71, 87, 0.3);
    border: none;
    display: inline-block;
}

.btn-primary-large:hover {
    background: #ff6b81;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 71, 87, 0.4);
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.platform-card {
    background: #ffffff;
    padding: 45px 25px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.platform-card:hover {
    box-shadow: 0 15px 35px rgba(0, 86, 255, 0.1);
    border-color: #0056ff;
    transform: translateY(-5px);
}

.platform-card img {
    width: 96px;
    height: 96px;
    margin: 0 auto 25px;
}

.platform-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #111;
}

.platform-card p {
    color: #777;
    margin-bottom: 10px;
    font-size: 14px;
}

.btn-download {
    display: inline-block;
    margin-top: 25px;
    padding: 14px 35px;
    background: #0056ff;
    color: #ffffff;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-download:hover {
    background: #0044cc;
    box-shadow: 0 6px 20px rgba(0, 86, 255, 0.4);
    transform: translateY(-2px);
}

.download-note {
    max-width: 760px;
    margin: 28px auto 0;
    color: #66758a;
    font-size: 14px;
    line-height: 1.8;
}

.setup-steps {
    background: #ffffff;
}

.setup-grid,
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    max-width: 1140px;
    margin: 0 auto;
}

.setup-card,
.tip-card {
    text-align: left;
    background: #f8faff;
    border-radius: 18px;
    padding: 30px;
    box-shadow: 0 10px 28px rgba(0, 86, 255, 0.05);
}

.setup-card span {
    width: 50px;
    height: 50px;
    border-radius: 16px;
    background: #0056ff;
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 18px;
}

.setup-card h3,
.tip-card h3 {
    font-size: 20px;
    color: #111;
    margin-bottom: 12px;
}

.setup-card p,
.tip-card p {
    color: #5f6b7a;
    line-height: 1.8;
    font-size: 15px;
}

/* ================= Footer ================= */
footer {
    background: #0f141e;
    color: #8892a0;
    padding: 80px 5% 30px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto 50px;
    gap: 50px;
}

.footer-content h4 {
    color: #ffffff;
    font-size: 18px;
    margin-bottom: 25px;
    font-weight: 500;
}

.contact-info p {
    margin-bottom: 12px;
}

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

.links-container a {
    color: #8892a0;
    transition: color 0.3s ease;
}

.links-container a:hover {
    color: #ffffff;
}

.copyright {
    text-align: center;
    border-top: 1px solid #232a35;
    padding-top: 30px;
    font-size: 14px;
}

/* ================= Responsive ================= */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        padding: 15px 20px;
    }

    nav ul {
        margin-top: 20px;
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero {
        padding: 80px 20px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .hero-tags {
        gap: 10px;
    }

    .hero-tags span {
        font-size: 13px;
    }

    section {
        padding: 60px 20px;
    }

    section h2,
    .download-guide h1 {
        font-size: 30px;
        margin-bottom: 36px;
    }

    .preview-shell {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .preview-copy h2 {
        text-align: center;
    }

    .preview-copy .section-eyebrow {
        margin-left: auto;
        margin-right: auto;
    }

    .check-list {
        text-align: left;
    }

    .card.premium {
        transform: scale(1);
    }

    .alert-box {
        padding: 20px;
    }

    .setup-card,
    .tip-card,
    .stat-card,
    .feature-item,
    .platform-card {
        padding: 26px 22px;
    }
}