:root {
    --brand: #1d6fd8;
    --brand-dark: #1258b0;
    --brand-soft: #eaf3fc;
    --brand-line: rgba(29, 111, 216, 0.16);
    --text: #111827;
    --muted: #4b5563;
    --line: #e6edf5;
    --bg: #ffffff;
    --panel: #f6fafe;
    --shadow: 0 8px 28px rgba(17, 52, 96, 0.06);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
}

a {
    color: var(--brand);
    text-decoration: none;
}

a:hover {
    color: var(--brand-dark);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(10px);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text);
}

.brand img {
    height: 44px;
    width: auto;
    display: block;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-text strong {
    color: var(--brand);
    font-size: 18px;
    letter-spacing: 1px;
}

.brand-text span {
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 1.5px;
}

.nav-main {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.nav-main a {
    color: var(--text);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 15px;
}

.nav-main a:hover,
.nav-main a.active {
    color: var(--brand);
    background: var(--brand-soft);
}

.page {
    min-height: calc(100vh - 168px);
}

.hero {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(circle at 12% 18%, rgba(29, 111, 216, 0.12), transparent 38%),
        radial-gradient(circle at 88% 8%, rgba(29, 111, 216, 0.08), transparent 32%),
        linear-gradient(180deg, #f4f9fe 0%, #ffffff 72%);
    border-bottom: 1px solid var(--line);
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(29, 111, 216, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(29, 111, 216, 0.06) 1px, transparent 1px);
    background-size: 28px 28px;
    mask-image: radial-gradient(ellipse at 30% 30%, #000 20%, transparent 72%);
    pointer-events: none;
}

.hero-inner {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
    padding: 68px 24px 56px;
}

.kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    color: var(--brand);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
}

.kicker::before {
    content: "";
    width: 18px;
    height: 2px;
    background: var(--brand);
}

.hero-brand {
    font-size: clamp(36px, 5.4vw, 58px);
    line-height: 1.12;
    color: var(--brand);
    margin: 0 0 12px;
    letter-spacing: 2px;
}

.hero-en {
    display: block;
    margin-top: 8px;
    font-size: clamp(13px, 1.8vw, 16px);
    color: var(--muted);
    font-weight: 500;
    letter-spacing: 3px;
}

.hero h2 {
    margin: 0 0 14px;
    font-size: clamp(20px, 2.8vw, 30px);
    font-weight: 600;
}

.hero-lead {
    max-width: 760px;
    color: var(--muted);
    font-size: 16px;
    margin: 0 0 26px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    max-width: 920px;
}

.stat {
    padding: 16px 0 4px;
    border-top: 2px solid var(--brand);
}

.stat strong {
    display: block;
    font-size: 26px;
    color: var(--brand);
}

.stat span {
    color: var(--muted);
    font-size: 13px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    cursor: pointer;
    border-radius: 6px;
    padding: 10px 18px;
    font-size: 14px;
    transition: 0.2s ease;
}

.btn-primary {
    background: var(--brand);
    color: #fff;
}

.btn-primary:hover {
    background: var(--brand-dark);
    color: #fff;
}

.btn-outline {
    background: #fff;
    color: var(--brand);
    border: 1px solid var(--brand);
}

.btn-outline:hover {
    background: var(--brand-soft);
}

.section {
    max-width: 1180px;
    margin: 0 auto;
    padding: 48px 24px;
}

.section-head {
    margin-bottom: 28px;
}

.section-head h2 {
    margin: 0 0 8px;
    font-size: 28px;
}

.section-head p {
    margin: 0;
    color: var(--muted);
}

.band {
    background: var(--panel);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.band .section {
    padding-top: 44px;
    padding-bottom: 44px;
}

.industry-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
}

.industry-card,
.feature-item,
.algo-card,
.step-card,
.contact-card,
.quote,
.scene-item,
.highlight {
    position: relative;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 12px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.industry-card,
.feature-item,
.algo-card,
.step-card,
.contact-card,
.highlight {
    padding: 22px 20px;
}

.industry-card:hover,
.feature-item:hover,
.algo-card:hover,
.contact-card:hover {
    border-color: rgba(29, 111, 216, 0.35);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.industry-card::before,
.algo-card::before,
.feature-item::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 8px;
    width: 10px;
    height: 10px;
    border-top: 1.5px solid var(--brand);
    border-left: 1.5px solid var(--brand);
    opacity: 0.7;
}

.icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    color: var(--brand);
    background: var(--brand-soft);
    border: 1px solid var(--brand-line);
}

.industry-card h3,
.feature-item h3,
.algo-card h3,
.step-card h3,
.contact-card h3,
.highlight h3,
.scene-item h3 {
    margin: 0 0 8px;
    font-size: 17px;
}

.industry-card p,
.feature-item p,
.algo-card p,
.step-card p,
.contact-card p,
.highlight p,
.scene-item p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.7;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 14px;
}

.tag {
    font-size: 12px;
    color: var(--brand);
    background: var(--brand-soft);
    border-radius: 999px;
    padding: 3px 10px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.page-banner {
    background:
        linear-gradient(180deg, #f3f8fd, #ffffff);
    border-bottom: 1px solid var(--line);
    padding: 42px 0 28px;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(29, 111, 216, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(29, 111, 216, 0.05) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}

.page-banner-inner {
    position: relative;
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 24px;
}

.page-banner h1 {
    margin: 0 0 8px;
    color: var(--brand);
    font-size: 32px;
    letter-spacing: 1px;
}

.page-banner p {
    margin: 0;
    color: var(--muted);
    max-width: 720px;
}

.algo-cats {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 28px;
    padding: 14px;
    border: 1px solid var(--brand-line);
    border-radius: 14px;
    background:
        linear-gradient(180deg, #f3f8fe 0%, #ffffff 70%);
    box-shadow: var(--shadow);
}

.algo-cat {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin: 0;
    padding: 16px 8px 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font-family: inherit;
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.algo-cat::after {
    content: "";
    position: absolute;
    left: 18%;
    right: 18%;
    bottom: 0;
    height: 3px;
    border-radius: 3px 3px 0 0;
    background: transparent;
}

.algo-cat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--brand);
    background: var(--brand-soft);
    border: 1px solid var(--brand-line);
}

.algo-cat-name {
    font-size: 15px;
    font-weight: 700;
    line-height: 1.3;
}

.algo-cat-en {
    font-size: 10px;
    letter-spacing: 1.4px;
    color: var(--muted);
    font-weight: 700;
}

.algo-cat:hover {
    border-color: rgba(29, 111, 216, 0.4);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    color: var(--brand);
}

.algo-cat.active {
    border-color: var(--brand);
    background: linear-gradient(180deg, #eaf3fc, #ffffff);
    color: var(--brand);
    box-shadow: 0 8px 20px rgba(29, 111, 216, 0.14);
    transform: translateY(-2px);
}

.algo-cat.active::after {
    background: var(--brand);
}

.algo-cat.active .algo-cat-icon {
    background: var(--brand);
    color: #fff;
    border-color: var(--brand);
}

.algo-cat.active .algo-cat-en {
    color: var(--brand);
}

.algo-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.algo-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 10px;
}

.algo-type {
    font-size: 11px;
    letter-spacing: 1px;
    color: var(--brand);
    font-weight: 700;
}

.algo-acc {
    font-size: 12px;
    color: var(--muted);
}

.highlights {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.highlight {
    border-top: 2px solid var(--brand);
    background: linear-gradient(180deg, #f7fbff, #ffffff);
}

.num {
    display: block;
    margin-bottom: 10px;
    color: var(--brand);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.step-no {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    background: var(--brand);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
}

.scenes {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.scene-item {
    padding: 18px 18px 18px 20px;
    border-left: 3px solid var(--brand);
    background: linear-gradient(90deg, var(--brand-soft), #ffffff 68%);
}

.quotes {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.quote {
    padding: 20px;
    background: linear-gradient(180deg, #f8fbfe, #ffffff);
}

.quote p {
    margin: 0 0 12px;
    font-size: 14px;
}

.quote span {
    color: var(--brand);
    font-size: 13px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.contact-card strong {
    display: block;
    margin-top: 4px;
    font-size: 20px;
    color: var(--text);
    letter-spacing: 0.3px;
}

.contact-intro {
    max-width: 760px;
    margin: 0 0 24px;
    color: var(--muted);
}

.site-footer {
    border-top: 1px solid var(--line);
    background: #f8fafc;
    padding: 28px 24px;
    color: var(--muted);
    font-size: 13px;
}

.footer-inner {
    max-width: 1180px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-brand {
    color: var(--brand);
    font-weight: 700;
    margin-bottom: 4px;
}

@media (max-width: 1100px) {
    .industry-grid,
    .feature-list,
    .algo-grid,
    .highlights,
    .steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .algo-cats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 960px) {
    .stats,
    .quotes,
    .scenes,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .header-inner {
        flex-wrap: wrap;
    }

    .nav-main {
        width: 100%;
    }
}

@media (max-width: 640px) {
    .industry-grid,
    .feature-list,
    .algo-grid,
    .highlights,
    .steps {
        grid-template-columns: 1fr;
    }

    .algo-cats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        padding: 10px;
        gap: 8px;
    }
}