/* 和统科技官网 · 统一样式
   设计口径：白底 + 深绿主色，工业 B2B，无渐变无动效，信息密度优先 */

:root {
    --green-900: #0d3a29;
    --green-800: #0f4430;
    --green-700: #14543c;
    --green-600: #1b6a4c;
    --green-500: #218a62;
    --green-100: #dcece3;
    --green-50: #eef5f1;

    --ink: #15201a;
    --ink-2: #46554d;
    --ink-3: #78867e;
    --ink-4: #9aa69f;

    --line: #e1e8e3;
    --line-strong: #cbd6ce;
    --bg: #ffffff;
    --bg-2: #f6f9f7;
    --bg-3: #eff4f1;

    --warm: #a8502f;
    --warm-bg: #fbf0ea;
    --warm-line: #f0d9cd;

    --radius: 4px;
    --wrap: 1160px;
}

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

html,
body {
    max-width: 100%;
    overflow-x: hidden;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

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

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

strong {
    font-weight: 600;
}

.num {
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.wrap {
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 顶栏 ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.97);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 32px;
    height: 68px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    white-space: nowrap;
}

.logo-mark {
    width: 29px;
    height: 38px;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.25;
}

.brand-text strong {
    font-size: 17px;
    letter-spacing: 1px;
    color: var(--ink);
}

.brand-text em {
    font-style: normal;
    font-size: 11px;
    color: var(--ink-3);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 4px;
    margin-left: auto;
    min-width: 0;
}

.nav a {
    padding: 6px 14px;
    font-size: 15px;
    color: var(--ink-2);
    border-radius: 3px;
}

.nav a:hover {
    color: var(--green-700);
    background: var(--green-50);
}

.nav a.active {
    color: var(--green-700);
    font-weight: 600;
    background: var(--green-50);
}

.header-cta {
    flex-shrink: 0;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 30px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn-primary {
    background: var(--green-700);
    color: #fff;
}

.btn-primary:hover {
    background: var(--green-800);
}

.btn-ghost {
    background: transparent;
    color: var(--green-700);
    border-color: var(--line-strong);
}

.btn-ghost:hover {
    border-color: var(--green-600);
    background: var(--green-50);
}

.btn-light {
    background: #fff;
    color: var(--green-800);
}

.btn-light:hover {
    background: var(--green-50);
}

.btn-outline-light {
    border-color: rgba(255, 255, 255, 0.42);
    color: #fff;
}

.btn-outline-light:hover {
    border-color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.btn-sm {
    padding: 8px 18px;
    font-size: 14px;
}

/* ---------- 首屏 ---------- */
.hero {
    background: var(--green-900);
    color: #fff;
    padding: 92px 0 84px;
}

.hero .eyebrow {
    color: rgba(255, 255, 255, 0.62);
}

.hero h1 {
    font-size: 52px;
    line-height: 1.24;
    letter-spacing: 1px;
    font-weight: 600;
    margin: 18px 0 22px;
    max-width: 900px;
}

.hero-sub {
    font-size: 18px;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.78);
    max-width: 680px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 30px;
}

.tag {
    padding: 6px 16px;
    font-size: 14px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 2px;
    color: rgba(255, 255, 255, 0.9);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 38px;
}

/* 内页头部 */
.page-head {
    background: var(--bg-3);
    border-bottom: 1px solid var(--line);
    padding: 64px 0 56px;
}

.page-head h1 {
    font-size: 40px;
    line-height: 1.3;
    letter-spacing: 0.5px;
    font-weight: 600;
    margin: 14px 0 18px;
}

.page-head .lead {
    font-size: 17px;
    color: var(--ink-2);
    max-width: 720px;
}

.eyebrow {
    font-size: 12px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--ink-3);
    font-weight: 600;
}

/* ---------- 指标 ---------- */
.metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
    margin-top: -46px;
    position: relative;
    z-index: 2;
    background-color: var(--line);
}

.metric {
    background: #fff;
    padding: 30px 28px 26px;
}

.metric-label {
    display: block;
    font-size: 13px;
    color: var(--ink-3);
    letter-spacing: 0.5px;
}

.metric-value {
    display: flex;
    align-items: baseline;
    gap: 7px;
    margin-top: 10px;
}

.metric-value b {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: -0.5px;
    line-height: 1.1;
}

.metric-value i {
    font-style: normal;
    font-size: 14px;
    color: var(--ink-3);
}

.metric-note {
    display: block;
    margin-top: 10px;
    font-size: 12.5px;
    color: var(--ink-4);
}

.metrics-foot {
    margin-top: 14px;
    font-size: 12.5px;
    color: var(--ink-4);
}

/* ---------- 区块 ---------- */
.section {
    padding: 78px 0;
}

.section.alt {
    background: var(--bg-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 40px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--line);
}

.section-head h2 {
    font-size: 27px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.section-head .note {
    font-size: 13.5px;
    color: var(--ink-3);
    flex-shrink: 0;
}

.section-lead {
    font-size: 16.5px;
    color: var(--ink-2);
    max-width: 760px;
    margin: -16px 0 40px;
}

/* 编号要点 */
.points {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.points.three {
    grid-template-columns: repeat(3, 1fr);
}

.point {
    background: #fff;
    padding: 32px 32px 30px;
}

.point-no {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--green-500);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.point h3 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 10px;
}

.point p {
    font-size: 15px;
    color: var(--ink-2);
    line-height: 1.8;
}

/* 卡片网格 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 32px;
}

.card h3 {
    font-size: 19px;
    font-weight: 600;
    margin: 12px 0 12px;
}

.card p {
    font-size: 15px;
    color: var(--ink-2);
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    font-size: 12px;
    letter-spacing: 1px;
    background: var(--green-50);
    color: var(--green-700);
    border-radius: 2px;
}

/* 列表条目 */
.items {
    border-top: 1px solid var(--line);
}

.item {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 32px;
    padding: 24px 0;
    border-bottom: 1px solid var(--line);
}

.item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
}

.item-desc {
    font-size: 15px;
    color: var(--ink-2);
    line-height: 1.8;
}

/* 链路 */
.chain {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin: 24px 0;
}

.chain span {
    padding: 9px 18px;
    font-size: 14px;
    background: var(--green-50);
    color: var(--green-700);
    border: 1px solid var(--green-100);
    border-radius: 2px;
}

.chain i {
    font-style: normal;
    color: var(--ink-4);
}

/* 对比表 */
.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

table.cmp {
    width: 100%;
    border-collapse: collapse;
    min-width: 720px;
    background: #fff;
}

table.cmp th,
table.cmp td {
    padding: 16px 20px;
    text-align: left;
    font-size: 14.5px;
    line-height: 1.7;
    border-bottom: 1px solid var(--line);
    vertical-align: top;
}

table.cmp thead th {
    background: var(--bg-3);
    font-weight: 600;
    font-size: 13.5px;
    color: var(--ink-2);
    letter-spacing: 0.5px;
    white-space: nowrap;
}

table.cmp tbody tr:last-child td {
    border-bottom: none;
}

table.cmp td.k {
    font-weight: 600;
    white-space: nowrap;
    color: var(--ink);
}

table.cmp td.peer {
    color: var(--warm);
    background: #fdfaf8;
}

table.cmp td.us {
    color: var(--green-700);
    background: var(--green-50);
    font-weight: 500;
}

/* 公式块 */
.formula {
    background: var(--green-900);
    color: #fff;
    padding: 32px 36px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}

.formula-line {
    font-size: 17px;
    word-break: break-word;
    color: rgba(255, 255, 255, 0.82);
    letter-spacing: 0.3px;
}

.formula-result {
    font-size: 42px;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin: 8px 0 4px;
}

.formula-result small {
    font-size: 15px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.6);
    margin-left: 8px;
}

.formula-sub {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.55);
}

/* 键值表 */
.kv {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    overflow: hidden;
}

.kv-row {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 14px 20px;
    font-size: 15px;
    border-bottom: 1px solid var(--line);
}

.kv-row:last-child {
    border-bottom: none;
}

.kv-row span:first-child {
    color: var(--ink-3);
}

.kv-row span:last-child {
    font-weight: 500;
}

/* 案例 */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.filter {
    padding: 8px 18px;
    font-size: 14px;
    border: 1px solid var(--line-strong);
    background: #fff;
    color: var(--ink-2);
    border-radius: 2px;
    cursor: pointer;
    font-family: inherit;
}

.filter:hover {
    border-color: var(--green-500);
    color: var(--green-700);
}

.filter.active {
    background: var(--green-700);
    border-color: var(--green-700);
    color: #fff;
}

.case {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 32px;
    margin-bottom: 18px;
    background: #fff;
}

.case-head {
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 6px;
}

.case-head h3 {
    font-size: 19px;
    font-weight: 600;
}

.case-scene {
    display: block;
    font-size: 13.5px;
    color: var(--ink-3);
    margin-bottom: 20px;
}

.case-row {
    display: grid;
    grid-template-columns: 116px 1fr;
    gap: 20px;
    padding: 12px 0;
    border-top: 1px dashed var(--line);
    font-size: 14.5px;
    line-height: 1.8;
}

.case-row span:first-child {
    color: var(--ink-3);
    font-size: 13.5px;
    padding-top: 1px;
}

.case-row.pain span:first-child {
    color: var(--warm);
}

.case-row.result span:last-child {
    color: var(--green-700);
    font-weight: 500;
}

/* 行动区 */
.cta-band {
    background: var(--green-900);
    color: #fff;
    padding: 64px 0;
}

.cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    flex-wrap: wrap;
}

.cta-band h2 {
    font-size: 27px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.cta-band p {
    font-size: 15.5px;
    color: rgba(255, 255, 255, 0.72);
    max-width: 620px;
}

.cta-actions {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

/* 联系方式 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.contact-cell {
    background: #fff;
    padding: 28px 30px;
}

.contact-cell dt {
    font-size: 13px;
    color: var(--ink-3);
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.contact-cell dd {
    font-size: 17px;
    font-weight: 500;
    line-height: 1.6;
    word-break: break-all;
}

.contact-cell dd a:hover {
    color: var(--green-600);
}

/* 页脚 */
.site-footer {
    background: var(--bg-2);
    border-top: 1px solid var(--line);
    padding: 56px 0 32px;
    font-size: 14px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--line);
}

.footer-top h4 {
    font-size: 13px;
    color: var(--ink-3);
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 14px;
}

.footer-top ul {
    list-style: none;
}

.footer-top li {
    margin-bottom: 8px;
    color: var(--ink-2);
}

.footer-top li a:hover {
    color: var(--green-600);
}

.footer-desc {
    color: var(--ink-3);
    font-size: 13.5px;
    line-height: 1.9;
    margin-top: 14px;
    max-width: 320px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    padding-top: 24px;
    color: var(--ink-3);
    font-size: 13px;
}

.footer-bottom a:hover {
    color: var(--green-600);
}

/* 提示条 */
.notice {
    background: var(--warm-bg);
    border: 1px solid var(--warm-line);
    color: var(--warm);
    font-size: 13.5px;
    padding: 12px 18px;
    border-radius: var(--radius);
    margin-bottom: 32px;
    line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
    .header-inner {
        height: 62px;
        gap: 16px;
    }

    .nav {
        gap: 0;
        overflow-x: auto;
    }

    .nav a {
        padding: 6px 10px;
        font-size: 14px;
        white-space: nowrap;
    }

    .header-cta {
        display: none;
    }

    .hero {
        padding: 66px 0 62px;
    }

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

    .hero-sub {
        font-size: 16.5px;
    }

    .metrics {
        grid-template-columns: 1fr;
        margin-top: -34px;
    }

    .section {
        padding: 56px 0;
    }

    .section-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        margin-bottom: 28px;
    }

    .points,
    .points.three,
    .grid-2,
    .grid-3,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .item {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .case-row {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .page-head {
        padding: 46px 0 40px;
    }

    .page-head h1 {
        font-size: 30px;
    }

    .cta-band {
        padding: 48px 0;
    }
}

@media (max-width: 620px) {
    .wrap {
        padding: 0 18px;
    }

    /* 窄屏：顶栏改为两行，导航独占一行，避免出现半截菜单 */
    .header-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 10px 18px 0;
        gap: 0;
    }

    .brand {
        width: 100%;
    }

    .nav {
        width: 100%;
        margin: 8px 0 0;
        padding: 8px 0;
        border-top: 1px solid var(--line);
        justify-content: space-between;
        gap: 0;
        overflow-x: visible;
    }

    .nav a {
        padding: 4px 6px;
        font-size: 13px;
    }

    .hero h1 {
        font-size: 29px;
    }

    .hero {
        padding: 52px 0 54px;
    }

    .brand-text em {
        display: none;
    }

    .metric-value b {
        font-size: 30px;
    }

    .formula {
        padding: 24px;
    }

    .formula-result {
        font-size: 32px;
    }

    .case {
        padding: 24px 20px;
    }

    .footer-top {
        grid-template-columns: 1fr;
    }
}