/* 营销首页：大气简洁，正文直出便于 SEO / GEO 抓取 */
.landing-page {
    margin: 0;
    overflow-x: hidden;
    color: #0f172a;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
    background-color: #f0f9ff;
    background-image: linear-gradient(
        180deg,
        #bfdbfe 0%,
        #dbeafe 8%,
        #eff6ff 22%,
        #f8fafc 42%,
        #f0f9ff 58%,
        #eef2ff 78%,
        #e0e7ff 92%,
        #dbeafe 100%
    );
    background-attachment: scroll;
}

.landing-page a {
    color: inherit;
}

.landing-page > main > .landing-nav {
    flex-shrink: 0;
}

.landing-hero-shell {
    position: relative;
    min-height: calc(100vh - 56px);
    min-height: calc(100dvh - 56px);
    display: flex;
    flex-direction: column;
    background: radial-gradient(ellipse 120% 80% at 50% -30%, rgba(37, 99, 235, 0.28), transparent 50%),
        radial-gradient(ellipse 80% 50% at 80% 20%, rgba(96, 165, 250, 0.15), transparent 45%),
        radial-gradient(ellipse 80% 50% at 20% 30%, rgba(147, 197, 253, 0.12), transparent 45%),
        linear-gradient(180deg, #dbeafe 0%, #eff6ff 45%, rgba(239, 246, 255, 0) 100%);
}

.landing-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    max-width: 1080px;
    margin-left: auto;
    margin-right: auto;
    padding: 16px 20px 8px;
    background: transparent;
    border-bottom: none;
}

.landing-nav.is-scrolled {
    padding: 12px 20px;
    background: transparent;
}

.landing-nav.is-scrolled::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 0;
    right: 0;
    bottom: 0;
    left: 50%;
    width: 100vw;
    margin-left: -50vw;
    background: rgba(239, 246, 255, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 rgba(37, 99, 235, 0.08);
    pointer-events: none;
}

.landing-nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 17px;
    text-decoration: none;
    color: #0f172a;
}

.landing-nav-brand img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

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

.landing-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.landing-btn:active {
    transform: scale(0.98);
}

.landing-btn-primary {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}

.landing-btn-primary:hover {
    box-shadow: 0 10px 28px rgba(37, 99, 235, 0.42);
}

.landing-btn-ghost {
    background: rgba(255, 255, 255, 0.45);
    color: #334155;
    border: 1px solid rgba(37, 99, 235, 0.12);
}

.landing-btn-ghost:hover {
    background: rgba(255, 255, 255, 0.65);
    border-color: rgba(37, 99, 235, 0.2);
}

.landing-hero {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 20px 40px;
    background: transparent;
}

.landing-hero-inner {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
}

.landing-hero-badge {
    display: inline-block;
    margin: 0 0 16px;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.15);
}

.landing-hero h1 {
    margin: 0 0 16px;
    font-size: clamp(28px, 5vw, 44px);
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-weight: 800;
    color: #0f172a;
}

.landing-hero-lead {
    margin: 0 auto 28px;
    max-width: 680px;
    font-size: clamp(16px, 2.5vw, 18px);
    color: #475569;
}

.landing-hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 36px;
}

.landing-hero-cta .landing-btn-primary {
    padding: 14px 28px;
    font-size: 16px;
}

.landing-hero-points {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 20px;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 14px;
    color: #64748b;
}

.landing-hero-points li::before {
    content: "✓ ";
    color: #2563eb;
    font-weight: 700;
}

.landing-hero-disclaimer {
    margin: 22px auto 0;
    max-width: 520px;
    font-size: 11px;
    line-height: 1.5;
    color: #94a3b8;
    text-align: center;
}

.landing-footer-disclaimer {
    margin: 0 0 8px;
    font-size: 11px;
    color: #64748b;
}

/* 全宽区块：无硬分割，靠页面纵向渐变自然过渡 */
.landing-band {
    position: relative;
    width: 100%;
    background: transparent;
}

.landing-band--paper,
.landing-band--muted,
.landing-band--cta {
    border: none;
    box-shadow: none;
}

.landing-band--paper::before,
.landing-band--muted::before {
    display: none;
}

.landing-band--cta {
    padding: 56px 20px 72px;
    background: linear-gradient(180deg, rgba(224, 231, 255, 0) 0%, rgba(199, 210, 254, 0.35) 100%);
}

.landing-section {
    max-width: 1080px;
    margin: 0 auto;
    padding: 56px 20px 72px;
}

.landing-band--cta .landing-section {
    padding: 0;
    max-width: none;
}

.landing-section-head {
    margin-bottom: 40px;
    padding-bottom: 0;
    border-bottom: none;
}

.landing-section-head--center {
    text-align: center;
}

.landing-section-head--center .landing-section-desc {
    margin-left: auto;
    margin-right: auto;
}

.landing-section-title {
    margin: 0 0 8px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #2563eb;
}

.landing-section h2 {
    margin: 0 0 12px;
    font-size: clamp(22px, 3.5vw, 30px);
    letter-spacing: -0.02em;
}

.landing-section-desc {
    margin: 0;
    max-width: 720px;
    color: #64748b;
    font-size: 16px;
}

/* 特性列表：上下逐块；每块内部再左右分文案与图 */
.landing-features-list {
    display: flex;
    flex-direction: column;
    gap: 40px;
    width: 100%;
}

article.landing-feature-card {
    position: relative;
    z-index: 0;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: 20px;
    width: 100%;
    box-sizing: border-box;
    margin: 0;
    padding: 36px 0;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
}

article.landing-feature-card::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 100vw;
    margin-left: -50vw;
    pointer-events: none;
}

article.landing-feature-card:not(.is-reverse)::before {
    background: linear-gradient(
        90deg,
        rgba(186, 230, 253, 0.55) 0%,
        rgba(219, 234, 254, 0.38) 28%,
        rgba(239, 246, 255, 0.22) 52%,
        rgba(248, 250, 252, 0.08) 78%,
        rgba(255, 255, 255, 0) 100%
    );
}

article.landing-feature-card.is-reverse::before {
    background: linear-gradient(
        270deg,
        rgba(199, 210, 254, 0.5) 0%,
        rgba(224, 231, 255, 0.34) 28%,
        rgba(238, 242, 255, 0.2) 52%,
        rgba(248, 250, 252, 0.08) 78%,
        rgba(255, 255, 255, 0) 100%
    );
}

article.landing-feature-card:nth-of-type(odd):not(.is-reverse)::before {
    background: linear-gradient(
        90deg,
        rgba(191, 219, 254, 0.48) 0%,
        rgba(224, 242, 254, 0.32) 30%,
        rgba(241, 245, 249, 0.12) 65%,
        rgba(255, 255, 255, 0) 100%
    );
}

article.landing-feature-card:nth-of-type(even).is-reverse::before {
    background: linear-gradient(
        270deg,
        rgba(196, 181, 253, 0.42) 0%,
        rgba(221, 214, 254, 0.28) 30%,
        rgba(241, 245, 249, 0.1) 65%,
        rgba(255, 255, 255, 0) 100%
    );
}

article.landing-feature-card:last-child {
    margin-bottom: 0;
}

.landing-feature-copy {
    padding: 12px 8px;
    min-width: 0;
    background: none;
    border: none;
    box-shadow: none;
}

.landing-feature-copy h3 {
    margin: 0 0 16px;
    padding: 0;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
    border: none;
}

@media (min-width: 768px) {
    .landing-features-list {
        gap: 48px;
    }

    article.landing-feature-card {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto;
        gap: 32px 48px;
        align-items: center;
        padding: 44px 0;
    }

    article.landing-feature-card.is-reverse .landing-feature-copy {
        grid-column: 2;
        grid-row: 1;
    }

    article.landing-feature-card.is-reverse .landing-feature-media {
        grid-column: 1;
        grid-row: 1;
    }

    .landing-feature-copy {
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}

.landing-feature-copy p {
    margin: 0 0 12px;
    color: #475569;
    font-size: 15px;
}

.landing-feature-list {
    margin: 16px 0 0;
    padding-left: 18px;
    color: #475569;
    font-size: 14px;
}

.landing-feature-media {
    margin: 0;
    border-radius: 16px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.55);
    box-shadow: 0 10px 32px rgba(37, 99, 235, 0.07);
}

.landing-feature-media img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: linear-gradient(145deg, #f1f5f9, #e2e8f0);
}

.landing-feature-media figcaption {
    padding: 12px 16px;
    font-size: 12px;
    color: #94a3b8;
    border-top: 1px solid #f1f5f9;
}

.landing-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.landing-stat-card {
    padding: 24px 20px;
    border-radius: 16px;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.85), rgba(239, 246, 255, 0.6));
    border: 1px solid rgba(255, 255, 255, 0.9);
    text-align: center;
    box-shadow: 0 10px 32px rgba(37, 99, 235, 0.08);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.landing-stat-card > strong {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    margin: 0 auto 12px;
    border-radius: 50%;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    flex-shrink: 0;
}

.landing-stat-card span {
    display: block;
    font-size: 14px;
    line-height: 1.65;
    color: #475569;
}

.landing-stat-card span strong,
.landing-stat-card span b {
    display: inline;
    width: auto;
    height: auto;
    margin: 0;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
    font-weight: 700;
    color: #1d4ed8;
    background: none;
}

.landing-stat-card span a {
    color: #2563eb;
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

#faq .landing-section-head {
    text-align: left;
}

.landing-faq {
    max-width: 720px;
    margin: 0;
    padding: 0;
    text-align: left;
}

.landing-faq-item {
    margin: 0;
    padding: 16px 0;
    border: none;
    border-radius: 0;
    background: transparent;
    border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.landing-faq-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.landing-faq-question {
    margin: 0;
    font-weight: 600;
    font-size: 15px;
    line-height: 1.5;
    color: #0f172a;
}

.landing-faq-answer {
    margin: 10px 0 0;
    font-size: 14px;
    line-height: 1.65;
    color: #475569;
}

.landing-cta-band {
    max-width: 1040px;
    margin: 0 auto;
    padding: 48px 32px;
    border-radius: 24px;
    text-align: center;
    background: linear-gradient(135deg, #1e40af, #2563eb);
    color: #fff;
    box-shadow: 0 24px 56px rgba(37, 99, 235, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.landing-cta-band h2 {
    margin: 0 0 8px;
    font-size: 24px;
}

.landing-cta-band p {
    margin: 0 0 20px;
    opacity: 0.92;
    font-size: 15px;
}

.landing-cta-band .landing-btn-primary {
    background: #fff;
    color: #1d4ed8;
    box-shadow: none;
}

.landing-footer {
    padding: 32px 20px calc(28px + env(safe-area-inset-bottom, 0));
    text-align: center;
    font-size: 12px;
    color: #94a3b8;
    background: #0f172a;
    color: #94a3b8;
    border-top: none;
}

.landing-footer a {
    color: #cbd5e1;
}

.landing-footer a {
    text-decoration: none;
}

.landing-footer a:hover {
    text-decoration: underline;
}

.landing-footer p {
    margin: 0 0 6px;
}

.landing-footer-sep {
    margin: 0 6px;
    color: #475569;
}

/* —— 手机端 —— */
@media (max-width: 767px) {
    .landing-nav {
        flex-wrap: nowrap;
        max-width: none;
        padding: calc(10px + env(safe-area-inset-top, 0)) 14px 10px;
        gap: 12px;
    }

    .landing-nav.is-scrolled {
        padding: calc(8px + env(safe-area-inset-top, 0)) 14px;
    }

    .landing-nav-brand {
        flex: 1;
        font-size: 15px;
        min-width: 0;
    }

    .landing-nav-brand span {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .landing-nav-brand img {
        width: 28px;
        height: 28px;
        flex-shrink: 0;
    }

    .landing-nav-actions {
        width: auto;
        flex-shrink: 0;
        gap: 0;
    }

    .landing-nav-actions .landing-btn-ghost {
        display: none;
    }

    .landing-nav-actions .landing-btn-primary {
        flex: none;
        padding: 10px 16px;
        font-size: 13px;
        white-space: nowrap;
    }

    .landing-hero-shell {
        min-height: auto;
    }

    .landing-hero {
        align-items: flex-start;
        padding: 4px 16px 28px;
    }

    .landing-hero-inner {
        text-align: left;
    }

    .landing-hero-badge {
        display: block;
        max-width: 100%;
        font-size: 11px;
        line-height: 1.45;
        text-align: center;
        margin-bottom: 14px;
    }

    .landing-hero h1 {
        font-size: 22px;
        line-height: 1.3;
        margin-bottom: 14px;
    }

    .landing-hero-lead {
        font-size: 14px;
        line-height: 1.65;
        margin-bottom: 20px;
        text-align: left;
    }

    .landing-hero-cta {
        flex-direction: column;
        align-items: stretch;
        margin-bottom: 24px;
        gap: 10px;
    }

    .landing-hero-cta .landing-btn {
        width: 100%;
        box-sizing: border-box;
    }

    .landing-hero-cta .landing-btn-primary {
        padding: 13px 20px;
        font-size: 15px;
    }

    .landing-hero-points {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        font-size: 13px;
    }

    .landing-hero-disclaimer {
        text-align: left;
        font-size: 10px;
    }

    .landing-section {
        padding: 36px 16px 44px;
    }

    .landing-section-head {
        margin-bottom: 24px;
    }

    .landing-section h2 {
        font-size: 20px;
    }

    .landing-section-desc {
        font-size: 14px;
    }

    .landing-features-list {
        gap: 28px;
    }

    article.landing-feature-card {
        padding: 28px 0;
    }

    .landing-feature-copy {
        padding: 8px 4px;
    }

    article.landing-feature-card.is-reverse .landing-feature-copy,
    article.landing-feature-card.is-reverse .landing-feature-media {
        grid-column: auto;
        grid-row: auto;
    }

    .landing-feature-copy h3 {
        font-size: 18px;
        display: block;
    }

    .landing-feature-copy p,
    .landing-feature-list {
        font-size: 14px;
    }

    article.landing-feature-card:not(.is-reverse)::before,
    article.landing-feature-card.is-reverse::before,
    article.landing-feature-card:nth-of-type(odd):not(.is-reverse)::before,
    article.landing-feature-card:nth-of-type(even).is-reverse::before {
        background: linear-gradient(
            180deg,
            rgba(219, 234, 254, 0.42) 0%,
            rgba(239, 246, 255, 0.22) 42%,
            rgba(248, 250, 252, 0.06) 72%,
            rgba(255, 255, 255, 0) 100%
        );
    }

    .landing-feature-media {
        border-radius: 12px;
    }

    .landing-feature-media img {
        max-height: 200px;
        aspect-ratio: auto;
        object-fit: contain;
        background: #f1f5f9;
    }

    .landing-feature-media figcaption {
        display: none;
    }

    .landing-section-head--center {
        text-align: left;
    }

    .landing-section-head--center .landing-section-desc {
        margin-left: 0;
        margin-right: 0;
    }

    .landing-stats {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .landing-stat-card {
        text-align: left;
        padding: 18px 16px 18px 18px;
        display: grid;
        grid-template-columns: 44px 1fr;
        grid-template-rows: auto;
        column-gap: 14px;
        align-items: start;
    }

    .landing-stat-card > strong {
        margin: 2px 0 0;
        grid-row: 1;
        align-self: start;
        width: 36px;
        height: 36px;
        font-size: 16px;
    }

    .landing-stat-card span {
        grid-column: 2;
        font-size: 13px;
    }

    .landing-faq-item {
        padding: 14px 0;
    }

    .landing-cta-band {
        padding: 32px 20px;
        border-radius: 18px;
    }

    .landing-cta-band h2 {
        font-size: 20px;
    }

    .landing-band--cta {
        padding: 36px 16px 48px;
    }

    .landing-cta-band .landing-btn-primary {
        display: block;
        width: 100%;
        box-sizing: border-box;
    }

    .landing-footer {
        padding-bottom: calc(20px + env(safe-area-inset-bottom, 0));
        font-size: 11px;
    }

    .landing-footer-beian {
        line-height: 1.7;
        word-break: break-all;
    }
}

@media (max-width: 380px) {
    .landing-hero h1 {
        font-size: 20px;
    }
}