:root {
    --primary: #0A2463;
    --primary-light: #1e3a8a;
    --accent: #3E92CC;
    --accent-light: #7abfff;
    --page-bg: #f3f4f6;
    --text-main: #1f2937;
    --text-muted: #64748b;
    --line: #e5eaf2;
    --shadow: 0 12px 30px rgba(10, 36, 99, .08);
    --shadow-hover: 0 22px 45px rgba(10, 36, 99, .15);
    --radius-lg: 24px;
    --radius-md: 16px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--page-bg);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}

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

button {
    font-family: inherit;
    cursor: pointer;
}

.container-custom {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 36, 99, .88);
    border-bottom: 1px solid rgba(255, 255, 255, .10);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: all .3s ease;
}

    .site-header.scrolled {
        background: rgba(10, 36, 99, .98);
        box-shadow: 0 5px 22px rgba(10, 36, 99, .28);
    }

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

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: .03em;
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 11px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    box-shadow: 0 5px 14px rgba(62, 146, 204, .35);
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 36px;
}

/* 主菜单项 */
.nav-item {
    position: relative;
    display: inline-flex;
    align-items: center;
    color: rgba(255, 255, 255, .82);
    font-size: 14px;
    font-weight: 500;
    transition: color .25s ease;
    cursor: default;
    padding: 6px 0;
}

    .nav-item > a {
        color: inherit;
        padding-right: 4px;
    }

        .nav-item > a:hover {
            color: #fff;
        }

    .nav-item .arrow {
        display: inline-block;
        margin-left: 4px;
        font-size: 11px;
        transition: transform .25s ease;
    }

    .nav-item:hover .arrow {
        transform: rotate(180deg);
    }

    /* 悬浮下拉菜单 */
    .nav-item .dropdown-menu {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%) translateY(6px);
        min-width: 180px;
        padding: 8px 0;
        margin-top: 8px;
        border-radius: 14px;
        background: rgba(255, 255, 255, .98);
        box-shadow: 0 18px 40px rgba(10, 36, 99, .2);
        border: 1px solid rgba(255, 255, 255, .4);
        backdrop-filter: blur(6px);
        -webkit-backdrop-filter: blur(6px);
        opacity: 0;
        visibility: hidden;
        transition: all .3s ease;
        z-index: 10;
    }

    .nav-item:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

.dropdown-link {
    display: block;
    padding: 8px 18px;
    color: var(--text-main);
    font-size: 13px;
    font-weight: 500;
    transition: background .2s ease, color .2s ease;
    border-radius: 6px;
    margin: 2px 6px;
    white-space: nowrap;
}

    .dropdown-link:hover {
        background: rgba(62, 146, 204, .08);
        color: var(--primary);
    }

/* 咨询按钮 */
.outline-btn {
    padding: 9px 19px;
    border: 1px solid rgba(255, 255, 255, .35);
    color: #fff;
    border-radius: 999px;
    font-size: 14px;
    transition: all .3s ease;
}

    .outline-btn:hover {
        color: var(--primary);
        background: #fff;
        border-color: #fff;
        transform: translateY(-2px);
    }

/* ========== 移动端导航 ========== */
.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    border: 0;
    color: #fff;
    background: transparent;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    padding: 14px 24px 20px;
    background: rgba(10, 36, 99, .98);
    border-top: 1px solid rgba(255, 255, 255, .08);
}

    .mobile-menu.open {
        display: block;
    }

.mobile-nav-item {
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, .06);
}

    .mobile-nav-item > a {
        color: rgba(255, 255, 255, .88);
        font-size: 15px;
    }

.mobile-dropdown {
    padding-left: 16px;
    margin-top: 6px;
}

    .mobile-dropdown a {
        display: block;
        padding: 6px 0;
        color: rgba(255, 255, 255, .7);
        font-size: 14px;
    }

        .mobile-dropdown a:hover {
            color: #fff;
        }

/* ========== Hero ========== */
.hero {
    position: relative;
    padding: 150px 0 86px;
    overflow: hidden;
    color: #fff;
    background: linear-gradient(135deg, #0A2463 0%, #16347f 42%, #1e3a8a 70%, #3E92CC 100%);
}

    .hero::before {
        content: "";
        position: absolute;
        top: -220px;
        right: -130px;
        width: 650px;
        height: 650px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(122, 191, 255, .25), transparent 68%);
    }

    .hero::after {
        content: "";
        position: absolute;
        left: -160px;
        bottom: -240px;
        width: 520px;
        height: 520px;
        border-radius: 50%;
        border: 1px solid rgba(255, 255, 255, .10);
        box-shadow: 0 0 0 38px rgba(255, 255, 255, .025), 0 0 0 76px rgba(255, 255, 255, .02);
    }

.hero-grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(360px, .88fr);
    align-items: center;
    gap: 72px;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 22px;
    color: rgba(255, 255, 255, .8);
    font-size: 13px;
    letter-spacing: .15em;
}

    .eyebrow::before {
        content: "";
        width: 32px;
        height: 2px;
        background: var(--accent-light);
    }

.hero h1 {
    margin: 0;
    max-width: 650px;
    font-size: clamp(42px, 5vw, 70px);
    line-height: 1.13;
    letter-spacing: -.04em;
    font-weight: 800;
}

    .hero h1 span {
        color: var(--accent-light);
    }

.hero-desc {
    max-width: 590px;
    margin: 25px 0 30px;
    color: rgba(255, 255, 255, .76);
    font-size: 17px;
    line-height: 1.9;
}

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

.primary-btn {
    padding: 12px 24px;
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), #2b83b7);
    box-shadow: 0 8px 20px rgba(62, 146, 204, .32);
    border-radius: 999px;
    transition: all .3s ease;
}

    .primary-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 13px 28px rgba(62, 146, 204, .45);
    }

.ghost-btn {
    padding: 11px 23px;
    color: #fff;
    border: 1px solid rgba(255, 255, 255, .38);
    border-radius: 999px;
    font-size: 14px;
    transition: all .3s ease;
}

    .ghost-btn:hover {
        background: rgba(255, 255, 255, .12);
        transform: translateY(-2px);
    }

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    margin-top: 48px;
    max-width: 680px;
}

.hero-stat {
    padding-left: 14px;
    border-left: 1px solid rgba(255, 255, 255, .24);
}

    .hero-stat strong {
        display: block;
        color: #fff;
        font-size: 22px;
        line-height: 1.3;
    }

    .hero-stat span {
        display: block;
        margin-top: 4px;
        color: rgba(255, 255, 255, .58);
        font-size: 12px;
    }

.hero-preview {
    position: relative;
    min-height: 360px;
    padding: 22px;
    border: 1px solid rgba(255, 255, 255, .24);
    border-radius: 28px;
    background: rgba(255, 255, 255, .11);
    box-shadow: 0 25px 70px rgba(4, 17, 57, .26), inset 0 1px 0 rgba(255, 255, 255, .14);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transform: rotate(1deg);
}

.preview-window {
    height: 100%;
    padding: 19px;
    border-radius: 20px;
    background: rgba(248, 250, 252, .97);
    color: var(--text-main);
    transform: rotate(-1deg);
}

.preview-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--line);
}

.preview-title {
    color: var(--primary);
    font-size: 14px;
    font-weight: 800;
}

.live-tag {
    padding: 5px 9px;
    color: #15803d;
    border-radius: 999px;
    background: #dcfce7;
    font-size: 10px;
    font-weight: 700;
}

.chart-box {
    position: relative;
    height: 112px;
    margin: 22px 0 18px;
    overflow: hidden;
    border-radius: 14px;
    background: linear-gradient(180deg, #eaf5ff, #f8fbff);
}

    .chart-box::before {
        content: "";
        position: absolute;
        left: 8%;
        right: 5%;
        bottom: 20px;
        height: 62px;
        background: linear-gradient(135deg, transparent 0 8%, var(--accent) 9% 11%, transparent 12% 24%, var(--accent) 25% 27%, transparent 28% 41%, var(--accent) 42% 44%, transparent 45% 61%, var(--accent) 62% 64%, transparent 65% 73%, var(--accent) 74% 76%, transparent 77%);
        opacity: .85;
        clip-path: polygon(0 80%, 10% 62%, 20% 70%, 30% 38%, 40% 52%, 50% 20%, 60% 43%, 70% 32%, 80% 55%, 90% 14%, 100% 34%, 100% 100%, 0 100%);
    }

.chart-label {
    position: absolute;
    left: 14px;
    top: 12px;
    color: #64748b;
    font-size: 11px;
}

.preview-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.mini-card {
    padding: 12px 9px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
}

    .mini-card small {
        display: block;
        color: #94a3b8;
        font-size: 9px;
    }

    .mini-card strong {
        display: block;
        margin-top: 5px;
        color: var(--primary);
        font-size: 19px;
    }

    .mini-card.warning strong {
        color: #ea580c;
    }

    .mini-card.accent strong {
        color: var(--accent);
    }

/* ========== 内容卡片 ========== */
.main-content {
    position: relative;
    z-index: 5;
    margin-top: -38px;
    padding-bottom: 70px;
}

.section-card,
.product-card {
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, .75);
    border-radius: var(--radius-lg);
    background: #fff;
    box-shadow: var(--shadow);
}

.section-card {
    padding: 38px;
}

.product-card {
    position: relative;
    overflow: hidden;
    padding: 42px;
    background: linear-gradient(135deg, rgba(255, 255, 255, .98), rgba(247, 250, 253, .94));
    transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}

    .product-card::before {
        content: "";
        position: absolute;
        top: -110px;
        right: -110px;
        width: 360px;
        height: 360px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(62, 146, 204, .12), transparent 68%);
        pointer-events: none;
    }

    .product-card:hover {
        transform: translateY(-5px);
        border-color: rgba(62, 146, 204, .35);
        box-shadow: var(--shadow-hover);
    }

.product-layout {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: center;
}

.product-code {
    display: inline-flex;
    margin-bottom: 18px;
    padding: 7px 17px;
    border: 1px solid rgba(62, 146, 204, .18);
    border-radius: 999px;
    color: var(--accent);
    background: rgba(62, 146, 204, .09);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .12em;
}

    .product-code.purple {
        color: #4f46e5;
        border-color: rgba(79, 70, 229, .16);
        background: rgba(79, 70, 229, .08);
    }

.product-title {
    margin: 0 0 15px;
    color: var(--primary);
    font-size: clamp(25px, 3vw, 35px);
    line-height: 1.35;
    font-weight: 800;
    letter-spacing: -.025em;
}

.product-desc {
    max-width: 800px;
    margin: 0;
    color: #526174;
    font-size: 15px;
    line-height: 1.9;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px 20px;
    padding: 0;
    margin: 23px 0 0;
    list-style: none;
}

    .feature-list li {
        display: flex;
        gap: 9px;
        align-items: flex-start;
        color: #334155;
        font-size: 14px;
        line-height: 1.65;
    }

        .feature-list li::before {
            content: "✓";
            display: inline-flex;
            flex: 0 0 19px;
            align-items: center;
            justify-content: center;
            width: 19px;
            height: 19px;
            margin-top: 2px;
            border-radius: 50%;
            color: #fff;
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            font-size: 11px;
            font-weight: 800;
        }

    .feature-list.purple li::before {
        background: linear-gradient(135deg, #6366f1, #818cf8);
    }

.dashboard {
    position: relative;
    padding: 22px;
    border: 1px solid #e3eaf3;
    border-radius: 20px;
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 10px 25px rgba(15, 23, 42, .06);
}

.dashboard-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    color: #94a3b8;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .08em;
}

    .dashboard-heading::before {
        content: "";
        width: 7px;
        height: 7px;
        border-radius: 50%;
        background: #22c55e;
        box-shadow: 0 0 0 4px rgba(34, 197, 94, .12);
    }

.dashboard-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid #eef2f7;
}

    .dashboard-row:last-of-type {
        border-bottom: 0;
    }

.dashboard-label {
    color: #64748b;
    font-size: 13px;
}

.dashboard-value {
    color: var(--primary);
    font-size: 23px;
    font-weight: 800;
}

    .dashboard-value.accent {
        color: var(--accent);
    }

    .dashboard-value.warning {
        color: #ea580c;
    }

    .dashboard-value.success {
        color: #16a34a;
    }

.dashboard-foot {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    padding-top: 14px;
    color: #64748b;
    font-size: 10px;
    border-top: 1px solid #eef2f7;
}

.dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-right: 4px;
    border-radius: 50%;
    background: #22c55e;
}

/* ========== 区块标题 ========== */
.section-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 25px;
}

    .section-heading h2 {
        position: relative;
        margin: 0;
        padding-bottom: 12px;
        color: var(--primary);
        font-size: 25px;
        font-weight: 800;
    }

        .section-heading h2::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 48px;
            height: 4px;
            border-radius: 99px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
        }

    .section-heading p {
        margin: 0;
        color: #94a3b8;
        font-size: 13px;
    }

/* ========== 产品简介 ========== */
.intro-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.intro-item {
    padding: 23px;
    border: 1px solid #e3edf7;
    border-left: 4px solid var(--accent);
    border-radius: 15px;
    background: linear-gradient(135deg, #f1f8ff, #fbfdff);
    transition: all .3s ease;
}

    .intro-item:hover {
        transform: translateY(-4px);
        border-color: var(--accent);
        box-shadow: 0 10px 22px rgba(62, 146, 204, .10);
    }

    .intro-item strong {
        display: block;
        margin-bottom: 8px;
        color: var(--primary);
        font-size: 16px;
    }

    .intro-item span {
        color: #64748b;
        font-size: 13px;
        line-height: 1.8;
    }

/* ========== 核心能力 ========== */
.ability-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.ability-card {
    padding: 25px 16px;
    border: 1px solid #dcecff;
    border-radius: 17px;
    text-align: center;
    background: linear-gradient(180deg, #f0f7ff, #eaf4ff);
    transition: all .3s ease;
}

    .ability-card:hover {
        transform: translateY(-6px);
        border-color: var(--accent);
        box-shadow: 0 14px 28px rgba(62, 146, 204, .13);
    }

.ability-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    margin-bottom: 12px;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 6px 15px rgba(10, 36, 99, .07);
    font-size: 25px;
}

.ability-card h3 {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 16px;
}

.ability-card p {
    margin: 0;
    color: #64748b;
    font-size: 12px;
    line-height: 1.75;
}

/* ========== 系统架构 ========== */
.architecture {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.architecture-item {
    position: relative;
    padding: 25px;
    border-radius: 17px;
    background: #f8fafc;
    border: 1px solid #e7edf4;
}

    .architecture-item:not(:last-child)::after {
        content: "→";
        position: absolute;
        top: 50%;
        right: -25px;
        z-index: 2;
        color: var(--accent);
        font-size: 24px;
        font-weight: 800;
        transform: translateY(-50%);
    }

.architecture-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    margin-bottom: 15px;
    border-radius: 10px;
    color: #fff;
    background: var(--primary);
    font-size: 13px;
    font-weight: 800;
}

.architecture-item h3 {
    margin: 0 0 8px;
    color: var(--primary);
    font-size: 17px;
}

.architecture-item p {
    margin: 0;
    color: #64748b;
    font-size: 13px;
    line-height: 1.8;
}

.badge-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 9px;
    margin-top: 25px;
}

.badge {
    padding: 6px 13px;
    border-radius: 999px;
    color: #fff;
    background: var(--accent);
    font-size: 11px;
}

/* ========== AI学习平台 ========== */
.category-area {
    padding-top: 28px;
    margin-top: 30px;
    border-top: 1px solid #e8edf3;
}

.sub-heading {
    margin: 0 0 14px;
    color: var(--primary);
    font-size: 17px;
    font-weight: 800;
}

.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.category-tag {
    padding: 8px 15px;
    border: 1px solid rgba(62, 146, 204, .18);
    border-radius: 999px;
    color: var(--primary);
    background: rgba(62, 146, 204, .08);
    font-size: 12px;
    transition: all .25s ease;
}

    .category-tag:hover {
        color: #fff;
        background: var(--accent);
        transform: translateY(-2px);
    }

.course-area {
    margin-top: 28px;
}

.course-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.course-list {
    display: grid;
    gap: 11px;
}

.course-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 16px;
    border: 1px solid #e9eef5;
    border-radius: 15px;
    background: #fff;
    transition: all .25s ease;
}

    .course-item:hover {
        border-color: var(--accent);
        box-shadow: 0 8px 18px rgba(10, 36, 99, .07);
        transform: translateY(-2px);
    }

.course-name {
    color: #1e293b;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.55;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-top: 6px;
    color: #94a3b8;
    font-size: 11px;
}

.course-tag {
    flex: 0 0 auto;
    padding: 5px 9px;
    border-radius: 999px;
    color: #1e293b;
    background: #eef2f6;
    font-size: 10px;
    font-weight: 700;
}

    .course-tag.free {
        color: #166534;
        background: #dcfce7;
    }

    .course-tag.points {
        color: #1e4a8a;
        background: #dbeafe;
    }

    .course-tag.hot {
        color: #991b1b;
        background: #fee2e2;
    }

.membership-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-top: 25px;
    padding: 24px;
    border: 1px solid #cfe4ff;
    border-radius: 18px;
    background: linear-gradient(135deg, #eef7ff, #f0f0ff);
}

.membership-title {
    display: block;
    margin-bottom: 7px;
    color: var(--primary);
    font-size: 18px;
    font-weight: 800;
}

.membership-desc {
    color: #64748b;
    font-size: 13px;
}

.benefit-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    margin-top: 14px;
    color: #475569;
    font-size: 12px;
}

/* ========== CTA ========== */
.cta-card {
    position: relative;
    overflow: hidden;
    padding: 62px 30px;
    margin-bottom: 0;
    border-radius: var(--radius-lg);
    text-align: center;
    color: #fff;
    background: linear-gradient(135deg, #0A2463 0%, #1e3a8a 65%, #286f9f 100%);
}

    .cta-card::before {
        content: "";
        position: absolute;
        top: -150px;
        right: 8%;
        width: 340px;
        height: 340px;
        border: 1px solid rgba(255, 255, 255, .12);
        border-radius: 50%;
        box-shadow: 0 0 0 35px rgba(255, 255, 255, .035), 0 0 0 70px rgba(255, 255, 255, .025);
    }

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-card h2 {
    margin: 0 0 12px;
    color: #fff;
    font-size: 30px;
    font-weight: 800;
}

.cta-card p {
    margin: 0 0 24px;
    color: rgba(255, 255, 255, .73);
    font-size: 14px;
}

.white-btn {
    padding: 12px 23px;
    color: var(--primary);
    background: #fff;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 700;
    transition: all .3s ease;
}

    .white-btn:hover {
        background: #eef7ff;
        transform: translateY(-2px);
    }

.contact-line {
    margin-top: 26px;
    color: rgba(255, 255, 255, .62);
    font-size: 12px;
}

    .contact-line span {
        display: inline-block;
        margin: 0 4px;
    }

/* ========== 页脚 ========== */
.site-footer {
    padding: 34px 0 24px;
    color: #94a3b8;
    background: #0b1738;
}

.footer-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 25px;
}

.footer-brand {
    color: #fff;
    font-size: 17px;
    font-weight: 800;
}

.footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    font-size: 12px;
}

    .footer-nav a:hover {
        color: #fff;
    }

.copyright {
    padding-top: 20px;
    margin-top: 22px;
    border-top: 1px solid rgba(255, 255, 255, .08);
    text-align: center;
    font-size: 11px;
    line-height: 1.8;
}

/* ========== 返回顶部按钮 ========== */
.float-tools {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 90;
    display: grid;
    gap: 10px;
}

.float-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: 0;
    border-radius: 50%;
    color: #fff;
    background: var(--primary);
    box-shadow: 0 8px 22px rgba(10, 36, 99, .28);
    cursor: pointer;
    transition: all .3s ease;
}

    .float-btn:hover {
        background: var(--accent);
        transform: scale(1.08);
    }

.back-top {
    visibility: hidden;
    opacity: 0;
    transform: translateY(12px);
    transition: all .3s ease;
}

    .back-top.show {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

/* ========== 响应式 ========== */
@media (max-width: 1000px) {
    .desktop-nav {
        gap: 20px;
    }

    .hero-grid {
        gap: 35px;
    }

    .product-layout {
        gap: 25px;
    }

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

@media (max-width: 780px) {
    .container-custom {
        padding-left: 18px;
        padding-right: 18px;
    }

    .desktop-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .nav-inner {
        height: 64px;
    }

    .hero {
        min-height: 0;
        padding: 116px 0 80px;
    }

    .hero-grid,
    .product-layout,
    .course-columns {
        grid-template-columns: 1fr;
    }

    .hero-grid {
        gap: 42px;
    }

    .hero h1 {
        font-size: 43px;
    }

    .hero-desc {
        font-size: 15px;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px 14px;
        margin-top: 35px;
    }

    .hero-preview {
        max-width: 510px;
        min-height: 320px;
        margin: 0 auto;
        width: 100%;
    }

    .main-content {
        margin-top: -25px;
        padding-bottom: 45px;
    }

    .section-card,
    .product-card {
        padding: 25px 20px;
        border-radius: 20px;
    }

    .product-title {
        font-size: 26px;
    }

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

    .dashboard {
        max-width: none;
    }

    .section-heading {
        display: block;
    }

        .section-heading p {
            margin-top: 10px;
        }

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

    .architecture-item:not(:last-child)::after {
        content: "↓";
        top: auto;
        right: 50%;
        bottom: -29px;
        transform: translateX(50%);
    }

    .membership-box {
        display: block;
    }

        .membership-box .primary-btn {
            margin-top: 18px;
        }

    .footer-top {
        display: block;
    }

    .footer-nav {
        margin-top: 16px;
    }

    .float-tools {
        right: 15px;
        bottom: 15px;
    }
}

@media (max-width: 480px) {
    .brand {
        font-size: 17px;
    }

    .brand-mark {
        width: 32px;
        height: 32px;
    }

    .hero h1 {
        font-size: 38px;
    }

    .preview-cards {
        gap: 6px;
    }

    .mini-card {
        padding: 10px 6px;
    }

        .mini-card strong {
            font-size: 16px;
        }

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

    .course-item {
        align-items: flex-start;
        flex-direction: column;
    }

    .cta-card h2 {
        font-size: 25px;
    }

    .contact-line span {
        display: block;
        margin: 5px 0;
    }
}



/* ========== 服务页面专属样式 ========== */

/* 服务卡片网格 */
.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

@media (max-width: 1000px) {
    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 780px) {
    .service-grid {
        grid-template-columns: 1fr;
    }
}

.service-card {
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform .35s ease, box-shadow .35s ease;
    display: flex;
    flex-direction: column;
}

    .service-card:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-hover);
    }

    .service-card img {
        width: 100%;
        height: 200px;
        object-fit: cover;
    }

    .service-card .body {
        padding: 24px;
        flex: 1;
    }

        .service-card .body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 12px;
        }

        .service-card .body p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
            margin: 0 0 16px;
        }

        .service-card .body ul {
            list-style: none;
            padding: 0;
            margin: 0 0 16px;
        }

            .service-card .body ul li {
                font-size: 12px;
                color: #64748b;
                padding: 4px 0;
                display: flex;
                align-items: flex-start;
                gap: 6px;
            }

                .service-card .body ul li::before {
                    content: "•";
                    color: var(--accent);
                    font-weight: 700;
                }

    .service-card .footer {
        padding: 0 24px 24px;
    }

        .service-card .footer a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--accent);
            font-weight: 600;
            font-size: 14px;
            transition: color .2s ease;
        }

            .service-card .footer a:hover {
                color: var(--primary);
            }

/* 流程步骤 */
.process-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

@media (max-width: 1000px) {
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 780px) {
    .process-grid {
        grid-template-columns: 1fr;
    }
}

.step-card {
    background: #fff;
    padding: 24px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform .3s ease, box-shadow .3s ease;
}

    .step-card:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-hover);
    }

.step-number {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 800;
}

.step-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 8px;
}

.step-card p {
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.7;
    margin: 0;
}

/* 优势卡片 */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 1000px) {
    .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 780px) {
    .advantage-grid {
        grid-template-columns: 1fr;
    }
}

.advantage-card {
    background: #fff;
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform .3s ease, box-shadow .3s ease;
}

    .advantage-card:hover {
        transform: scale(1.03);
        box-shadow: var(--shadow-hover);
    }

.advantage-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: 14px;
    background: rgba(62, 146, 204, .10);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 8px;
}

.advantage-card p {
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.7;
    margin: 0;
}

/* 咨询区域 */
.consult-section {
    background: rgba(10, 36, 99, .04);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
}

    .consult-section h2 {
        font-size: 26px;
        font-weight: 700;
        color: var(--primary);
        margin: 0 0 12px;
    }

    .consult-section p {
        color: var(--text-muted);
        max-width: 600px;
        margin: 0 auto 24px;
        font-size: 15px;
        line-height: 1.8;
    }


/* ========== 服务页面专属 · 去AI味重构（保留图片） ========== */

/* ---- Hero 区域 ---- */
.hero-service .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.hero-service .hero-sub {
    font-size: 15px;
    color: rgba(255,255,255,.7);
    line-height: 1.9;
    max-width: 540px;
    margin-top: 16px;
}

.hero-service .hero-badge-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 28px;
}

.hero-service .hero-badge {
    padding: 6px 18px;
    border-radius: 999px;
    background: rgba(255,255,255,.12);
    backdrop-filter: blur(4px);
    font-size: 12px;
    color: rgba(255,255,255,.85);
    border: 1px solid rgba(255,255,255,.08);
}

.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 340px;
}

    .hero-visual .orb {
        width: 280px;
        height: 280px;
        border-radius: 50%;
        background: radial-gradient(circle at 30% 30%, rgba(62,146,204,.5), rgba(10,36,99,.2));
        position: relative;
        animation: orbPulse 6s ease-in-out infinite alternate;
    }

        .hero-visual .orb::after {
            content: '';
            position: absolute;
            inset: 20px;
            border-radius: 50%;
            border: 1px solid rgba(255,255,255,.15);
            animation: orbSpin 20s linear infinite;
        }

    .hero-visual .orb-inner {
        position: absolute;
        inset: 50px;
        border-radius: 50%;
        background: radial-gradient(circle at 60% 40%, rgba(122,191,255,.3), transparent 70%);
    }

@keyframes orbPulse {
    0% {
        transform: scale(1) rotate(0deg);
    }

    100% {
        transform: scale(1.06) rotate(8deg);
    }
}

@keyframes orbSpin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* ---- 服务卡片 · 交错瀑布流（图片保留） ---- */
.service-masonry {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    align-items: start;
}

.service-card-v2 {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all .4s cubic-bezier(.25,.46,.45,.94);
    display: flex;
    flex-direction: column;
}

    .service-card-v2:hover {
        transform: translateY(-8px) scale(1.005);
        box-shadow: var(--shadow-hover);
    }

    .service-card-v2 .card-media {
        height: 180px;
        overflow: hidden;
        background: #eef3f9;
        position: relative;
    }

        .service-card-v2 .card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            transition: transform .5s ease;
        }

    .service-card-v2:hover .card-media img {
        transform: scale(1.04);
    }

    .service-card-v2 .card-body {
        padding: 22px 24px 20px;
        flex: 1;
    }

        .service-card-v2 .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 8px;
            letter-spacing: -.02em;
        }

        .service-card-v2 .card-body p {
            color: var(--text-muted);
            font-size: 13px;
            line-height: 1.8;
            margin: 0 0 14px;
        }

        .service-card-v2 .card-body ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

            .service-card-v2 .card-body ul li {
                font-size: 12px;
                color: #475569;
                padding: 3px 0 3px 20px;
                position: relative;
                line-height: 1.6;
            }

                .service-card-v2 .card-body ul li::before {
                    content: '◆';
                    position: absolute;
                    left: 0;
                    top: 3px;
                    color: var(--accent);
                    font-size: 9px;
                }

    .service-card-v2 .card-foot {
        padding: 0 24px 20px;
    }

        .service-card-v2 .card-foot a {
            color: var(--accent);
            font-weight: 600;
            font-size: 13px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap .25s ease;
        }

            .service-card-v2 .card-foot a:hover {
                gap: 12px;
                color: var(--primary);
            }

    /* 卡片大小变体（AI 服务突出展示） */
    .service-card-v2.span-2 {
        grid-column: span 2;
    }

        .service-card-v2.span-2 .card-media {
            height: 220px;
        }

        .service-card-v2.span-2 .card-body h3 {
            font-size: 22px;
        }

    .service-card-v2.featured .card-media {
        position: relative;
    }

        .service-card-v2.featured .card-media::after {
            content: '✦ 重点推荐';
            position: absolute;
            top: 14px;
            right: 14px;
            background: var(--primary);
            color: #fff;
            font-size: 11px;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 999px;
            letter-spacing: .04em;
        }

@media (max-width: 1024px) {
    .service-masonry {
        grid-template-columns: repeat(2, 1fr);
    }

    .service-card-v2.span-2 {
        grid-column: span 2;
    }
}

@media (max-width: 640px) {
    .service-masonry {
        grid-template-columns: 1fr;
    }

    .service-card-v2.span-2 {
        grid-column: span 1;
    }

        .service-card-v2.span-2 .card-media {
            height: 180px;
        }

    .hero-service .hero-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-visual {
        min-height: 200px;
    }

        .hero-visual .orb {
            width: 180px;
            height: 180px;
        }
}

/* ---- 服务流程 · 时间线 ---- */
.process-timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    padding-left: 40px;
}

    .process-timeline::before {
        content: '';
        position: absolute;
        left: 12px;
        top: 20px;
        bottom: 20px;
        width: 2px;
        background: linear-gradient(180deg, var(--accent), var(--primary), var(--accent-light));
        border-radius: 2px;
    }

.process-step {
    position: relative;
    padding: 16px 0 16px 40px;
    border-bottom: 1px solid rgba(0,0,0,.04);
}

    .process-step:last-child {
        border-bottom: 0;
    }

    .process-step .step-dot {
        position: absolute;
        left: -34px;
        top: 22px;
        width: 18px;
        height: 18px;
        border-radius: 50%;
        background: var(--primary);
        border: 3px solid #fff;
        box-shadow: 0 0 0 3px var(--accent), var(--shadow);
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 10px;
        font-weight: 800;
    }

    .process-step .step-content {
        display: flex;
        flex-wrap: wrap;
        align-items: baseline;
        gap: 8px 20px;
    }

        .process-step .step-content h3 {
            margin: 0;
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
        }

        .process-step .step-content p {
            margin: 0;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
            flex: 1;
            min-width: 200px;
        }

/* ---- 优势 · 非对称网格 ---- */
.advantage-asym {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 18px;
}

.adv-item {
    background: #fff;
    border-radius: var(--radius-md);
    padding: 28px 20px;
    box-shadow: var(--shadow);
    transition: all .3s ease;
    text-align: center;
    border: 1px solid rgba(255,255,255,.6);
}

    .adv-item:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-hover);
        border-color: var(--accent);
    }

    .adv-item .adv-icon {
        font-size: 32px;
        margin-bottom: 12px;
        display: block;
    }

    .adv-item h4 {
        font-size: 16px;
        font-weight: 700;
        color: var(--primary);
        margin: 0 0 6px;
    }

    .adv-item p {
        font-size: 12px;
        color: var(--text-muted);
        line-height: 1.7;
        margin: 0;
    }

    .adv-item.span-2 {
        grid-column: span 2;
    }

    .adv-item.span-3 {
        grid-column: span 3;
    }

    .adv-item.span-4 {
        grid-column: span 4;
    }

    .adv-item.span-6 {
        grid-column: span 6;
    }

@media (max-width: 1024px) {
    .advantage-asym {
        grid-template-columns: repeat(4, 1fr);
    }

    .adv-item.span-2 {
        grid-column: span 2;
    }

    .adv-item.span-3 {
        grid-column: span 3;
    }

    .adv-item.span-4 {
        grid-column: span 4;
    }

    .adv-item.span-6 {
        grid-column: span 4;
    }
}

@media (max-width: 640px) {
    .advantage-asym {
        grid-template-columns: 1fr;
    }

    .adv-item.span-2,
    .adv-item.span-3,
    .adv-item.span-4,
    .adv-item.span-6 {
        grid-column: span 1;
    }
}

/* ---- CTA 区域 ---- */
.cta-soft {
    background: linear-gradient(135deg, rgba(10,36,99,.04), rgba(62,146,204,.06));
    border-radius: var(--radius-lg);
    padding: 52px 40px;
    text-align: center;
    border: 1px solid rgba(62,146,204,.12);
    position: relative;
    overflow: hidden;
}

    .cta-soft::before {
        content: '✦';
        position: absolute;
        top: -20px;
        right: 30px;
        font-size: 120px;
        color: rgba(62,146,204,.06);
    }

    .cta-soft h2 {
        font-size: 28px;
        font-weight: 800;
        color: var(--primary);
        margin: 0 0 12px;
        letter-spacing: -.02em;
    }

    .cta-soft p {
        color: var(--text-muted);
        font-size: 15px;
        max-width: 520px;
        margin: 0 auto 24px;
        line-height: 1.8;
    }

    .cta-soft .cta-actions {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 14px;
    }

    .cta-soft .contact-mini {
        margin-top: 20px;
        color: var(--text-muted);
        font-size: 13px;
    }

        .cta-soft .contact-mini a {
            color: var(--accent);
            font-weight: 600;
        }

/* ---- 装饰分隔 ---- */
.section-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 99px;
    margin: 0 0 20px;
}

    .section-divider.center {
        margin: 0 auto 20px;
    }

@media (max-width: 480px) {
    .process-timeline {
        padding-left: 28px;
    }

    .process-step .step-dot {
        left: -26px;
        width: 14px;
        height: 14px;
        font-size: 8px;
        top: 20px;
    }

    .process-step {
        padding-left: 28px;
    }

    .cta-soft {
        padding: 32px 20px;
    }

        .cta-soft h2 {
            font-size: 22px;
        }
}