/* ===== 基础变量 ===== */
:root {
    --qt-green: #41CD52;
    --qt-green-dark: #2FA63D;
    --qt-green-light: #5EE36F;
    --bg-dark: #0F1B14;
    --bg-darker: #0A1410;
    --bg-card: #16241C;
    --bg-card-hover: #1B2E23;
    --text-primary: #E8F5EC;
    --text-secondary: #9CB3A4;
    --text-muted: #6B8478;
    --border: rgba(65, 205, 82, 0.15);
    --border-strong: rgba(65, 205, 82, 0.35);
    --shadow-glow: 0 0 40px rgba(65, 205, 82, 0.15);
    --radius: 14px;
    --radius-sm: 8px;
    --max-width: 1180px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ===== 布局容器 ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}
.container-narrow { max-width: 860px; }

/* ===== 顶部导航 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 27, 20, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--text-primary);
}
.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--qt-green), var(--qt-green-dark));
}
.brand-name { letter-spacing: 0.5px; }
.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-menu a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}
.nav-menu a:not(.nav-download):hover { color: var(--qt-green-light); }
.nav-menu a:not(.nav-download)::after {
    content: "";
    position: absolute;
    left: 0; bottom: -6px;
    width: 0; height: 2px;
    background: var(--qt-green);
    transition: width var(--transition);
}
.nav-menu a:not(.nav-download):hover::after { width: 100%; }
.nav-download {
    padding: 8px 20px;
    background: var(--qt-green);
    color: #06120A !important;
    border-radius: 999px;
    font-weight: 600 !important;
    transition: all var(--transition);
}
.nav-download:hover {
    background: var(--qt-green-light);
    box-shadow: 0 4px 20px rgba(65, 205, 82, 0.4);
    transform: translateY(-1px);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== 首屏 ===== */
.hero {
    position: relative;
    padding: 80px 0 120px;
    background:
        radial-gradient(ellipse 80% 60% at 20% 20%, rgba(65, 205, 82, 0.15), transparent 60%),
        radial-gradient(ellipse 70% 50% at 90% 70%, rgba(47, 166, 61, 0.12), transparent 60%),
        var(--bg-dark);
    overflow: hidden;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(65, 205, 82, 0.12);
    border: 1px solid var(--border-strong);
    color: var(--qt-green-light);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 24px;
}
.hero-text h1 {
    font-size: clamp(28px, 4vw, 48px);
    line-height: 1.25;
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #FFFFFF 0%, #5EE36F 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.lead {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}
.lead strong { color: var(--qt-green-light); font-weight: 600; }
.hero-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 36px;
    padding: 18px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.meta-item { display: flex; flex-direction: column; gap: 4px; }
.meta-label {
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
.meta-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--qt-green-light);
}
.meta-divider {
    width: 1px;
    height: 36px;
    background: var(--border-strong);
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 600;
    transition: all var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: var(--qt-green);
    color: #06120A;
    box-shadow: 0 6px 24px rgba(65, 205, 82, 0.35);
}
.btn-primary:hover {
    background: var(--qt-green-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 32px rgba(65, 205, 82, 0.5);
}
.btn-ghost {
    border: 1px solid var(--border-strong);
    color: var(--text-primary);
}
.btn-ghost:hover {
    background: rgba(65, 205, 82, 0.08);
    border-color: var(--qt-green);
}

/* 首屏截图 */
.hero-shot { position: relative; }
.shot-frame {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-glow), 0 20px 60px rgba(0, 0, 0, 0.4);
    aspect-ratio: 16 / 10;
    transition: transform var(--transition);
}
.shot-frame:hover { transform: translateY(-4px); }
.screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.shot-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
    background:
        linear-gradient(135deg, rgba(65, 205, 82, 0.05), transparent),
        repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 12px, transparent 12px 24px);
    border-radius: var(--radius);
}
.hero-wave {
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 80px;
    background: var(--bg-dark);
    clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 60%);
}

/* ===== 通用区块 ===== */
.section {
    padding: 90px 0;
}
.section-alt {
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.section-head {
    text-align: center;
    margin-bottom: 56px;
}
.section-head h2 {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800;
    margin-bottom: 14px;
}
.section-head p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 640px;
    margin: 0 auto;
}

/* ===== 功能特性 ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-card {
    padding: 28px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.feature-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-glow);
}
.feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    background: rgba(65, 205, 82, 0.12);
    border-radius: 12px;
    margin-bottom: 18px;
}
.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 用户评价 ===== */
.review-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.review-card {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.review-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-2px);
}
.review-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}
.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--qt-green), var(--qt-green-dark));
    color: #06120A;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}
.review-head > div:nth-child(2) { flex: 1; }
.review-name { font-weight: 700; font-size: 16px; }
.review-role { font-size: 13px; color: var(--text-muted); }
.stars { color: #FFB400; font-size: 14px; letter-spacing: 1px; }
.review-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.75;
}

/* ===== 常见问题 ===== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}
.faq-item.active { border-color: var(--border-strong); }
.faq-question {
    width: 100%;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    transition: color var(--transition);
}
.faq-question:hover { color: var(--qt-green-light); }
.faq-question span:first-child { flex: 1; padding-right: 16px; }
.faq-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--qt-green);
    transition: transform var(--transition);
    flex-shrink: 0;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}
.faq-answer p {
    padding: 0 24px 22px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
}

/* ===== 下载区域 ===== */
.download-section {
    background:
        radial-gradient(ellipse 60% 80% at 50% 50%, rgba(65, 205, 82, 0.12), transparent 70%),
        var(--bg-darker);
}
.download-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-darker) 100%);
    border: 1px solid var(--border-strong);
    border-radius: 24px;
    padding: 56px 40px;
    text-align: center;
    box-shadow: var(--shadow-glow);
}
.download-head h2 {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #FFFFFF 0%, #5EE36F 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.download-head p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 36px;
}
.download-platforms {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}
.platform {
    padding: 16px 24px;
    background: rgba(65, 205, 82, 0.06);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    min-width: 160px;
}
.platform-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--qt-green-light);
    margin-bottom: 4px;
}
.platform-desc {
    font-size: 13px;
    color: var(--text-muted);
}
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 18px 48px;
    background: linear-gradient(135deg, var(--qt-green) 0%, var(--qt-green-dark) 100%);
    color: #06120A;
    border-radius: 999px;
    font-size: 18px;
    font-weight: 700;
    transition: all var(--transition);
    box-shadow: 0 8px 32px rgba(65, 205, 82, 0.4);
}
.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 40px rgba(65, 205, 82, 0.6);
}
.btn-download-icon { font-size: 22px; }
.download-note {
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-muted);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border);
    padding: 56px 0 32px;
}
.footer-inner { text-align: center; }
.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 14px;
}
.footer-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--qt-green), var(--qt-green-dark));
}
.footer-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color var(--transition);
}
.footer-links a:hover { color: var(--qt-green-light); }
.footer-copy {
    font-size: 13px;
    color: var(--text-muted);
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

/* ===== 响应式 ===== */
@media (max-width: 980px) {
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    .hero-text { order: 1; }
    .hero-shot { order: 2; }
    .hero { padding: 56px 0 90px; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0; right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(10, 20, 16, 0.98);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        padding: 12px 24px 24px;
        transform: translateY(-150%);
        transition: transform var(--transition);
        align-items: stretch;
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-menu a {
        padding: 14px 0;
        border-bottom: 1px solid var(--border);
        font-size: 16px;
    }
    .nav-menu a:not(.nav-download)::after { display: none; }
    .nav-download {
        margin-top: 12px;
        text-align: center;
        border-bottom: none !important;
    }
    .nav-toggle { display: flex; }
    .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; }
    .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    .review-grid { grid-template-columns: 1fr; }
    .section { padding: 64px 0; }
    .hero-meta { flex-direction: column; align-items: flex-start; gap: 16px; }
    .meta-divider { width: 100%; height: 1px; }
    .download-platforms { gap: 16px; }
    .platform { min-width: 140px; flex: 1 1 140px; }
    .download-card { padding: 40px 24px; }
    .btn-download { padding: 16px 36px; font-size: 16px; }
}

@media (max-width: 520px) {
    .feature-grid { grid-template-columns: 1fr; }
    .container { padding: 0 18px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .btn { width: 100%; }
    .footer-links { gap: 18px; }
}