/* ===== 基础样式 ===== */
:root {
    --primary: #0f1f33;
    --primary-light: #1e3a5f;
    --accent: #3d8fd9;
    --accent-soft: rgba(61, 143, 217, 0.18);
    --text: #1a1f26;
    --text-light: #5c6570;
    --bg-light: #f3f5f8;
    --bg-dark: #0f1f33;
    --white: #ffffff;
    --border: #dfe3ea;
    --hero-deep: #0a121c;
    --hero-mid: #0f2238;
    --line: rgba(255, 255, 255, 0.08);
    --container: 1180px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "IBM Plex Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.65;
    color: var(--text);
    background: var(--white);
    font-feature-settings: "kern" 1;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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

/* ===== 导航栏 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

/* 为移动端下拉导航提供定位参照 */
.header .container,
.header .header-inner {
    position: relative;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    height: 72px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    background: var(--primary);
    border-radius: 8px;
    border: 1px solid transparent;
    transition: background 0.25s ease, transform 0.2s ease;
    white-space: nowrap;
}

.header-cta:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 8px;
}

.logo-icon:not(img) {
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

.nav {
    display: flex;
    gap: 28px;
    flex: 1;
    justify-content: center;
}

.nav-link {
    font-size: 15px;
    color: var(--text-light);
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: all 0.3s ease;
}

/* ===== Hero区域（To B 深色科技首屏） ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 96px;
    overflow: hidden;
}

.hero--enterprise {
    color: rgba(255, 255, 255, 0.92);
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(900px 520px at 18% 12%, rgba(61, 143, 217, 0.22), transparent 60%),
        radial-gradient(700px 480px at 88% 30%, rgba(30, 58, 95, 0.55), transparent 55%),
        linear-gradient(165deg, var(--hero-deep) 0%, var(--hero-mid) 48%, #0a1624 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.45;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, black 20%, transparent 75%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.035'/%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-layout {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(280px, 0.88fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: center;
}

.hero-copy {
    text-align: left;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 18px;
}

.hero-eyebrow::before {
    content: '';
    width: 28px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(61, 143, 217, 0.9));
}

.hero-title {
    font-size: clamp(32px, 4.2vw, 52px);
    font-weight: 700;
    line-height: 1.12;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(16px, 1.9vw, 19px);
    color: rgba(255, 255, 255, 0.72);
    margin-bottom: 32px;
    line-height: 1.75;
    max-width: 36em;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 26px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 10px;
    border: 1px solid transparent;
    transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.2s ease;
}

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

.btn-primary:hover {
    background: #2f7fc4;
    transform: translateY(-1px);
}

.btn-ghost {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--line);
    color: rgba(255, 255, 255, 0.92);
}

.btn-ghost:hover {
    border-color: rgba(61, 143, 217, 0.55);
    background: rgba(61, 143, 217, 0.12);
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    list-style: none;
    padding: 0;
    margin: 0;
    max-width: 520px;
}

.hero-metrics li {
    padding: 16px 18px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--line);
}

.hm-val {
    display: block;
    font-size: 26px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.hm-lbl {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.4;
}

.hero-panel {
    border-radius: 16px;
    border: 1px solid var(--line);
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.02) 100%);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hp-card {
    padding: 16px 18px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.22);
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.hp-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: rgba(61, 143, 217, 0.95);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.hp-text {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.55;
}

.hp-foot {
    margin-top: 4px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.45);
    line-height: 1.5;
}

/* 信任条 */
.trust-strip {
    position: relative;
    z-index: 2;
    margin-top: -48px;
    padding: 0 0 72px;
}

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

.trust-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 22px 24px;
    box-shadow: 0 12px 40px rgba(15, 31, 51, 0.06);
}

.trust-kicker {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-transform: uppercase;
    margin-bottom: 8px;
}

.trust-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.trust-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 重点行业 */
.sectors-section {
    padding: 88px 0 96px;
    background: var(--white);
}

.sectors-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.sector-card {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px 22px;
    background: var(--bg-light);
    transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.sector-card:hover {
    border-color: rgba(61, 143, 217, 0.45);
    transform: translateY(-3px);
    box-shadow: 0 14px 36px rgba(15, 31, 51, 0.08);
}

.sector-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.sector-points {
    margin: 0;
    padding: 0;
    list-style: none;
}

.sector-points li {
    position: relative;
    padding-left: 14px;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.55;
    margin-bottom: 8px;
}

.sector-points li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
}

.sector-points li:last-child {
    margin-bottom: 0;
}

/* 合作路径 */
.engagement-section {
    padding: 96px 0;
    background: linear-gradient(180deg, var(--bg-light) 0%, #eef1f6 100%);
}

.engagement-track {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    background: var(--white);
}

.eng-step {
    padding: 28px 22px;
    border-right: 1px solid var(--border);
    position: relative;
}

.eng-step:last-child {
    border-right: none;
}

.eng-step-num {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 10px;
}

.eng-step h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.eng-step p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.section-kicker {
    text-align: center;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 10px;
}

.hero-content {
    max-width: 800px;
}

.hero-badges {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.badge {
    padding: 8px 20px;
    background: var(--white);
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 24px;
    font-size: 14px;
    font-weight: 500;
}

/* ===== 通用区块样式 ===== */
.section {
    padding: 100px 0;
}

.section-gray {
    background: var(--bg-light);
}

.section-dark {
    background: var(--bg-dark);
    color: var(--white);
}

.section-dark .section-title,
.section-dark .section-desc {
    color: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-light);
}

/* ===== 关于我们 ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 16px;
}

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

.stat-item {
    text-align: center;
    padding: 24px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

/* ===== 核心业务 ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(30, 58, 95, 0.12);
}

.service-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.service-icon svg {
    width: 28px;
    height: 28px;
    color: var(--white);
}

.service-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ===== 技术优势 ===== */
.advantages-content {
    max-width: 900px;
    margin: 0 auto;
}

.advantage-item {
    display: flex;
    gap: 32px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

.advantage-item:last-child {
    border-bottom: none;
}

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.4;
    line-height: 1;
    flex-shrink: 0;
    width: 80px;
}

.advantage-text h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.advantage-text p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    color: var(--white);
}

.contact-item h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    opacity: 0.7;
}

.contact-item p {
    font-size: 16px;
}

.contact-form {
    background: rgba(255, 255, 255, 0.05);
    padding: 40px;
    border-radius: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--white);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-submit {
    width: 100%;
    padding: 14px 32px;
    background: var(--white);
    color: var(--primary);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    background: var(--accent);
    color: var(--white);
}

/* ===== 底部 ===== */
.footer {
    background: var(--primary);
    padding: 40px 0;
    color: var(--white);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo .logo-icon {
    background: var(--white);
    color: var(--primary);
}

.footer-logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 8px;
}

.footer-logo .logo-text {
    color: var(--white);
}

.footer-copy {
    font-size: 14px;
    opacity: 0.7;
}

.footer-icp {
    font-size: 12px;
    opacity: 0.6;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-copy {
        text-align: left;
    }

    .hero-panel {
        max-width: 560px;
    }

    .sectors-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .engagement-track {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .eng-step:nth-child(2) {
        border-right: none;
    }

    .eng-step {
        border-bottom: 1px solid var(--border);
    }

    .eng-step:nth-child(n + 3) {
        border-bottom: none;
    }

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

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-stats {
        max-width: 400px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        flex: unset;
        justify-content: flex-start;
    }

    .nav.active {
        display: flex;
    }

    .header-cta {
        padding: 8px 14px;
        font-size: 13px;
    }

    .trust-strip {
        margin-top: -32px;
        padding-bottom: 56px;
    }

    .trust-strip-inner {
        grid-template-columns: 1fr;
    }

    .sectors-grid {
        grid-template-columns: 1fr;
    }

    .engagement-track {
        grid-template-columns: 1fr;
    }

    .eng-step {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .eng-step:last-child {
        border-bottom: none;
    }

    .hero-metrics {
        grid-template-columns: 1fr;
        max-width: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }


    .advantage-item {
        flex-direction: column;
        gap: 16px;
    }

    .advantage-number {
        width: auto;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 20px 60px;
    }

    .section {
        padding: 60px 0;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }
}
/* ===== 解决方案区块 ===== */
.solutions-section {
    padding: 100px 0;
    background: var(--bg-light);
}

/* 标签切换 */
.solutions-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.solutions-tab {
    padding: 10px 24px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-light);
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.solutions-tab:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.solutions-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

/* 解决方案网格 */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

/* 解决方案卡片 */
.solution-card {
    background: var(--white);
    border-radius: 12px;
    padding: 28px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(30, 58, 95, 0.1);
    border-color: var(--accent);
}

.solution-card.hidden {
    display: none;
}

/* 卡片头部：图标 + 标签 */
.solution-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.solution-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.solution-icon svg {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.solution-card:hover .solution-icon {
    background: var(--primary);
}

.solution-card:hover .solution-icon svg {
    color: var(--white);
}

/* 卡片标签 */
.solution-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-light);
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.solution-tag.ai {
    background: rgba(74, 144, 217, 0.1);
    color: var(--accent);
}

.solution-tag.space {
    background: rgba(30, 58, 95, 0.08);
    color: var(--primary);
}

.solution-tag.security {
    background: rgba(15, 31, 51, 0.08);
    color: var(--primary);
}

.solution-tag.data {
    background: rgba(61, 143, 217, 0.12);
    color: #1e5a94;
}

/* 卡片标题 */
.solution-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

/* 卡片描述 */
.solution-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
    flex-grow: 1;
}

/* 卡片数据指标 */
.solution-stats {
    display: flex;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    margin-bottom: 16px;
}

.solution-stat {
    text-align: center;
    flex: 1;
}

.solution-stat-value {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 4px;
}

.solution-stat-label {
    font-size: 11px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

/* 卡片链接 */
.solution-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.solution-link svg {
    width: 14px;
    height: 14px;
    transition: transform 0.3s ease;
}

.solution-card:hover .solution-link svg {
    transform: translateX(3px);
}

/* 动画 - 卡片入场 */
.solutions-grid .solution-card {
    opacity: 0;
    transform: translateY(20px);
    animation: solutionCardIn 0.5s ease forwards;
}

.solutions-grid .solution-card:nth-child(1) { animation-delay: 0.05s; }
.solutions-grid .solution-card:nth-child(2) { animation-delay: 0.1s; }
.solutions-grid .solution-card:nth-child(3) { animation-delay: 0.15s; }
.solutions-grid .solution-card:nth-child(4) { animation-delay: 0.2s; }
.solutions-grid .solution-card:nth-child(5) { animation-delay: 0.25s; }
.solutions-grid .solution-card:nth-child(6) { animation-delay: 0.3s; }

@keyframes solutionCardIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 解决方案详情弹窗 */
.solution-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 58, 95, 0.6);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.solution-modal.active {
    opacity: 1;
    visibility: visible;
}

.solution-modal-content {
    background: var(--white);
    border-radius: 12px;
    max-width: 720px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: all 0.3s ease;
    position: relative;
}

.solution-modal.active .solution-modal-content {
    transform: translateY(0);
}

.solution-modal-header {
    padding: 32px 32px 24px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--white);
    z-index: 1;
}

.solution-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-light);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.solution-modal-close:hover {
    background: var(--primary);
    color: var(--white);
}

.solution-modal-close svg {
    width: 18px;
    height: 18px;
}

.solution-modal-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-light);
    color: var(--accent);
    font-size: 11px;
    font-weight: 600;
    border-radius: 4px;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.solution-modal-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}

.solution-modal-subtitle {
    font-size: 15px;
    color: var(--text-light);
}

.solution-modal-body {
    padding: 28px 32px 32px;
}

.solution-modal-section {
    margin-bottom: 28px;
}

.solution-modal-section:last-child {
    margin-bottom: 0;
}

.solution-modal-section h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 14px;
}

.solution-modal-section p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

.solution-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.solution-feature {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px;
    background: var(--bg-light);
    border-radius: 8px;
}

.solution-feature-icon {
    width: 20px;
    height: 20px;
    color: var(--accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.solution-feature-text {
    font-size: 13px;
    color: var(--text);
    line-height: 1.5;
}

.solution-cta {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.solution-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    background: var(--primary);
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.solution-cta-btn:hover {
    background: var(--primary-light);
}

/* 核心亮点列表 */
.solution-highlights {
    list-style: none;
    padding: 0;
    margin: 0;
}

.solution-highlights li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 10px;
    font-size: 14px;
    color: var(--text);
    line-height: 1.6;
}

.solution-highlights li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    background: var(--accent);
    border-radius: 50%;
}

.solution-highlights li:last-child {
    margin-bottom: 0;
}

/* 适用场景标签 */
.solution-scenarios {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.solution-scenario-tag {
    display: inline-block;
    padding: 5px 12px;
    background: var(--bg-light);
    color: var(--text);
    font-size: 12px;
    font-weight: 500;
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* 响应式 */
@media (max-width: 1024px) {
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .solutions-section {
        padding: 60px 0;
    }

    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .solution-card {
        padding: 28px 24px;
    }

    .solution-modal-header {
        padding: 28px 24px 20px;
    }

    .solution-modal-body {
        padding: 24px 24px 32px;
    }

    .solution-modal-title {
        font-size: 24px;
    }

    .solution-features {
        grid-template-columns: 1fr;
    }
}