:root {
    --qy-blue: #0f4c81;
    --qy-blue-dark: #073763;
    --qy-cyan: #23a6d5;
    --qy-green: #12a87a;
    --qy-ink: #172033;
    --qy-muted: #667085;
    --qy-line: #dce6f2;
    --qy-bg: #f5f8fc;
    --qy-soft: #eaf4fb;
    --qy-gold: #d69422;
    --white: #ffffff;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--qy-ink);
    background: var(--white);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.7;
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.94);
    border-bottom: 1px solid rgba(15, 76, 129, 0.12);
    backdrop-filter: blur(14px);
}

.nav {
    width: min(1180px, calc(100% - 32px));
    min-height: 68px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    color: var(--qy-blue-dark);
    white-space: nowrap;
}

.brand img {
    width: 42px;
    height: 42px;
    border-radius: 10px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 26px;
    font-size: 15px;
    color: #2b3a55;
}

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

.nav-download {
    padding: 9px 16px;
    color: var(--white);
    background: var(--qy-blue);
    border-radius: 4px;
}

.hero {
    position: relative;
    overflow: hidden;
    min-height: calc(100vh - 68px);
    background:
        linear-gradient(110deg, rgba(7, 55, 99, 0.94), rgba(15, 76, 129, 0.83) 48%, rgba(35, 166, 213, 0.62)),
        url("assets/showcase/aibizhi.jpg") center / cover;
    color: var(--white);
}

.hero-inner {
    width: min(1180px, calc(100% - 32px));
    min-height: calc(100vh - 68px);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(300px, 0.92fr);
    align-items: center;
    gap: 54px;
    padding: 64px 0 92px;
}

.eyebrow {
    margin: 0 0 14px;
    color: #bfe8f8;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0;
}

.hero h1 {
    margin: 0;
    font-size: clamp(40px, 6vw, 72px);
    line-height: 1.06;
    letter-spacing: 0;
}

.hero-copy {
    max-width: 650px;
    margin: 24px 0 0;
    color: rgba(255, 255, 255, 0.84);
    font-size: 18px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    min-height: 48px;
    padding: 0 22px;
    border: 1px solid transparent;
    border-radius: 4px;
    font-weight: 700;
    cursor: pointer;
}

.button-primary {
    background: var(--qy-green);
    color: var(--white);
    box-shadow: 0 14px 30px rgba(18, 168, 122, 0.26);
}

.button-secondary {
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
    background: rgba(255, 255, 255, 0.08);
}

.button-light {
    border-color: var(--qy-line);
    color: var(--qy-blue-dark);
    background: var(--white);
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 38px;
    color: rgba(255, 255, 255, 0.82);
    font-size: 14px;
}

.hero-meta strong {
    display: block;
    color: var(--white);
    font-size: 22px;
}

.phone {
    width: min(390px, 100%);
    margin-left: auto;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 32px;
    background: rgba(255, 255, 255, 0.14);
    box-shadow: 0 28px 70px rgba(0, 0, 0, 0.26);
}

.phone-screen,
.app-screenshot {
    overflow: hidden;
    min-height: 680px;
    border-radius: 24px;
    background: #f7f9fc;
    color: var(--qy-ink);
}

.real-app-phone {
    padding: 0;
    background: rgba(255, 255, 255, 0.22);
}

.app-screenshot {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 680px;
    border-radius: 30px;
    background: #f3f6fb;
}

.app-status {
    height: 12px;
    background: #ffffff;
}

.app-header {
    height: 62px;
    display: grid;
    grid-template-columns: 42px 1fr 42px;
    align-items: center;
    padding: 0 18px;
    border-bottom: 1px solid #dce4f0;
    background: #ffffff;
    color: #202b42;
}

.app-header strong {
    text-align: center;
    font-size: 22px;
    line-height: 1;
}

.gear {
    color: #24324b;
    text-align: right;
    font-size: 22px;
}

.app-content {
    flex: 1;
    padding: 20px 16px 132px;
}

.app-content h2 {
    margin: 0 0 14px;
    color: #25324d;
    font-size: 19px;
    font-weight: 500;
}

.group-card,
.summary-card {
    display: grid;
    grid-template-columns: 56px minmax(0, 1fr) 74px 18px;
    gap: 12px;
    align-items: center;
    margin-bottom: 18px;
    padding: 22px 16px;
    border: 1px solid #dfe7f1;
    border-radius: 18px;
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(32, 43, 66, 0.13);
}

.group-cover,
.empty-cover {
    width: 52px;
    height: 52px;
    border-radius: 15px;
}

.group-cover {
    object-fit: cover;
}

.empty-cover {
    display: grid;
    place-items: center;
    background: #edf2fa;
    color: #6c9aff;
    font-weight: 800;
}

.group-info h3 {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    margin: 0 0 4px;
    color: #26334f;
    font-size: 20px;
    line-height: 1.2;
}

.group-info small {
    color: #72809b;
    font-size: 13px;
    font-weight: 600;
}

.group-info p {
    margin: 0;
    color: #73819e;
    font-size: 15px;
    line-height: 1.35;
}

.group-info span {
    display: block;
    margin-top: 4px;
    color: #6c9aff;
    font-size: 13px;
}

.play-now {
    min-width: 64px;
    height: 52px;
    border: 0;
    border-radius: 13px;
    background: #3fbda5;
    color: #ffffff;
    font-size: 15px;
}

.play-now.disabled {
    background: #e4e9f1;
    color: #74829b;
}

.more {
    color: #75839d;
    font-size: 24px;
    line-height: 1;
}

.summary-card {
    display: block;
    padding: 20px 16px;
}

.summary-card h3 {
    margin: 0 0 4px;
    color: #26334f;
    font-size: 18px;
    font-weight: 500;
}

.summary-card p {
    margin: 0 0 12px;
    color: #677792;
    font-size: 14px;
}

.summary-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.summary-tags span {
    padding: 4px 12px;
    border: 1px solid #dbe5f2;
    border-radius: 999px;
    background: #ffffff;
    color: #26334f;
    font-size: 14px;
    font-weight: 600;
}

.new-group {
    width: 100%;
    height: 54px;
    border: 0;
    border-radius: 13px;
    background: #6b99f8;
    color: #ffffff;
    font-size: 18px;
}

.app-tabs {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 74px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    align-items: center;
    border-top: 1px solid #dbe3ee;
    background: #ffffff;
}

.app-tabs span {
    display: grid;
    place-items: center;
    gap: 1px;
    color: #7b879d;
    font-size: 20px;
}

.app-tabs b {
    font-size: 13px;
    font-weight: 500;
}

.app-tabs .selected {
    color: #6b99f8;
}

.section {
    padding: 86px 0;
}

.section.alt {
    background: var(--qy-bg);
}

.container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.section-title {
    max-width: 720px;
    margin-bottom: 40px;
}

.section-title h2 {
    margin: 0 0 12px;
    color: var(--qy-blue-dark);
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.2;
}

.section-title p {
    margin: 0;
    color: var(--qy-muted);
    font-size: 17px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.feature-card {
    min-height: 210px;
    padding: 26px;
    border: 1px solid var(--qy-line);
    border-radius: 8px;
    background: var(--white);
}

.feature-icon {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    margin-bottom: 18px;
    border-radius: 8px;
    background: var(--qy-soft);
    color: var(--qy-blue);
}

.feature-card h3 {
    margin: 0 0 10px;
    color: var(--qy-blue-dark);
    font-size: 20px;
}

.feature-card p {
    margin: 0;
    color: var(--qy-muted);
}

.download-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: center;
    gap: 36px;
    padding: 34px;
    border: 1px solid var(--qy-line);
    border-radius: 8px;
    background: var(--white);
}

.download-panel h2 {
    margin: 0 0 10px;
    color: var(--qy-blue-dark);
}

.download-panel p {
    margin: 0;
    color: var(--qy-muted);
}

.download-actions {
    display: grid;
    gap: 12px;
}

.notice {
    margin-top: 16px;
    color: var(--qy-muted);
    font-size: 14px;
}

.spec-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 26px;
}

.spec {
    padding: 16px;
    border-left: 3px solid var(--qy-cyan);
    background: #f8fbfe;
}

.spec span {
    display: block;
    color: var(--qy-muted);
    font-size: 13px;
}

.spec strong {
    color: var(--qy-blue-dark);
}

.privacy-layout {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
}

.privacy-aside {
    position: sticky;
    top: 92px;
    padding: 22px;
    border: 1px solid var(--qy-line);
    border-radius: 8px;
    background: var(--white);
}

.privacy-aside a {
    display: block;
    padding: 8px 0;
    color: var(--qy-muted);
    font-size: 14px;
}

.privacy-content {
    padding: 34px;
    border: 1px solid var(--qy-line);
    border-radius: 8px;
    background: var(--white);
}

.privacy-content h1,
.privacy-content h2 {
    color: var(--qy-blue-dark);
    line-height: 1.25;
}

.privacy-content h1 {
    margin-top: 0;
}

.privacy-content p,
.privacy-content li {
    color: #344054;
}

.privacy-content code {
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--qy-soft);
    color: var(--qy-blue-dark);
}

.site-footer {
    padding: 36px 0;
    color: rgba(255, 255, 255, 0.76);
    background: var(--qy-blue-dark);
}

.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 18px;
}

@media (max-width: 900px) {
    .nav {
        min-height: auto;
        padding: 14px 0;
        align-items: flex-start;
        flex-direction: column;
    }

    .nav-links {
        width: 100%;
        overflow-x: auto;
        gap: 18px;
        padding-bottom: 4px;
    }

    .hero-inner,
    .download-panel,
    .privacy-layout {
        grid-template-columns: 1fr;
    }

    .hero-inner {
        padding-top: 46px;
    }

    .phone {
        margin: 0;
    }

    .feature-grid,
    .spec-list {
        grid-template-columns: repeat(2, 1fr);
    }

    .privacy-aside {
        position: static;
    }
}

@media (max-width: 560px) {
    .hero {
        min-height: auto;
    }

    .hero-inner {
        min-height: auto;
        padding-bottom: 58px;
    }

    .hero-actions,
    .footer-inner {
        flex-direction: column;
        align-items: stretch;
    }

    .button {
        width: 100%;
    }

    .phone-screen {
        min-height: 530px;
    }

    .app-screenshot {
        min-height: 610px;
    }

    .app-content {
        padding: 16px 12px 102px;
    }

    .group-card {
        grid-template-columns: 48px minmax(0, 1fr) 62px 12px;
        gap: 9px;
        padding: 18px 12px;
    }

    .group-info h3 {
        font-size: 18px;
    }

    .group-info p {
        font-size: 13px;
    }

    .play-now {
        min-width: 58px;
        height: 48px;
    }

    .section {
        padding: 58px 0;
    }

    .feature-grid,
    .spec-list {
        grid-template-columns: 1fr;
    }

    .download-panel,
    .privacy-content {
        padding: 22px;
    }
}