/* ============================================================
   style.css - 老伍供应链 全局样式（不含导航）
   导航样式已迁移到 nav.css
   ============================================================ */

/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    background: #f4f6fa;
    color: #1a2a3a;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    max-width: 100%;
    display: block;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Banner ===== */
.hero {
    background: linear-gradient(145deg, #0b1a2e 0%, #1a3a5c 50%, #1f4a7a 100%);
    color: #fff;
    padding: 70px 20px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -40px;
    right: -40px;
    width: 300px;
    height: 300px;
    background: rgba(45, 122, 255, 0.08);
    border-radius: 50%;
}
.hero .container {
    position: relative;
    z-index: 2;
}
.hero h1 {
    font-size: 34px;
    font-weight: 800;
    letter-spacing: 1px;
    line-height: 1.2;
}
.hero h1 .highlight {
    color: #6aafff;
}
.hero .sub-title {
    font-size: 18px;
    opacity: 0.9;
    margin-top: 12px;
    letter-spacing: 2px;
}
.hero .desc {
    font-size: 15px;
    opacity: 0.7;
    margin-top: 8px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-top: 28px;
    flex-wrap: wrap;
}
.hero-buttons .btn {
    padding: 12px 34px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.hero-buttons .btn:active {
    transform: scale(0.96);
}
.btn-primary {
    background: #2d7aff;
    color: #fff;
    box-shadow: 0 4px 20px rgba(45, 122, 255, 0.35);
}
.btn-primary:hover {
    box-shadow: 0 6px 28px rgba(45, 122, 255, 0.50);
}
.btn-outline-light {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.35);
}
.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.6);
}

/* ===== 通用标题 ===== */
.section-title {
    text-align: center;
    margin-bottom: 32px;
}
.section-title h2 {
    font-size: 26px;
    font-weight: 700;
    color: #0b1a2e;
}
.section-title p {
    color: #6b7a8a;
    font-size: 15px;
    margin-top: 4px;
}

/* ===== 通用区块 ===== */
.section {
    padding: 50px 0;
}
.section-bg-white {
    background: #fff;
}
.section-bg-gray {
    background: #f4f6fa;
}

/* ===== 卡片 ===== */
.card {
    background: #fff;
    border-radius: 16px;
    padding: 28px 32px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
    margin-bottom: 20px;
}
.card p {
    font-size: 15px;
    color: #2a3a4a;
    line-height: 1.8;
    margin-bottom: 10px;
}
.card strong {
    color: #0b1a2e;
}

/* ===== 网格 ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}
.grid-4 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 20px;
}
.grid-item {
    background: #f8faff;
    padding: 20px 18px;
    border-radius: 12px;
    border: 1px solid #eef3fa;
}
.grid-item h4 {
    font-size: 16px;
    color: #0b1a2e;
    margin-bottom: 4px;
}
.grid-item p {
    font-size: 14px;
    color: #4a5a6a;
    line-height: 1.6;
}
.grid-item .icon {
    font-size: 28px;
    display: block;
    margin-bottom: 6px;
}

/* ===== 步骤 ===== */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 16px 0 20px;
}
.steps .step {
    background: #f8faff;
    padding: 20px 16px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid #eef3fa;
}
.steps .step .num {
    font-size: 28px;
    font-weight: 800;
    color: #2d7aff;
}
.steps .step .label {
    font-size: 14px;
    font-weight: 600;
    color: #1a2a3a;
    margin-top: 4px;
}
.steps .step .desc {
    font-size: 12px;
    color: #6b7a8a;
    margin-top: 4px;
}

/* ===== 学习互动 ===== */
.learn-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
}
.learn-articles .article-item {
    padding: 14px 0;
    border-bottom: 1px solid #f0f2f5;
}
.learn-articles .article-item:last-child {
    border-bottom: none;
}
.learn-articles .article-item h4 {
    font-size: 16px;
    color: #0b1a2e;
}
.learn-articles .article-item p {
    font-size: 13px;
    color: #8895a7;
}
.learn-templates {
    background: #f8faff;
    padding: 20px 24px;
    border-radius: 12px;
    border: 1px solid #eef3fa;
}
.learn-templates h4 {
    font-size: 16px;
    color: #0b1a2e;
    margin-bottom: 12px;
}
.learn-templates .tmpl {
    padding: 10px 0;
    border-bottom: 1px solid #eef3fa;
    font-size: 14px;
}
.learn-templates .tmpl:last-child {
    border-bottom: none;
}
.learn-templates .tmpl .icon {
    margin-right: 8px;
}
.learn-templates .tmpl .download {
    color: #2d7aff;
    font-size: 13px;
    float: right;
}

/* ===== 两列块（定位） ===== */
.two-blocks {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.two-blocks .block {
    background: #f8faff;
    padding: 20px 24px;
    border-radius: 12px;
    border-left: 4px solid #2d7aff;
}
.two-blocks .block h4 {
    font-size: 16px;
    color: #0b1a2e;
}
.two-blocks .block p {
    font-size: 14px;
    color: #4a5a6a;
    margin-top: 4px;
}

/* ===== 诊断 ===== */
.diag-box {
    background: #fff;
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}
.diag-box p {
    font-size: 15px;
    color: #2a3a4a;
    line-height: 1.8;
}
.diag-box ul {
    list-style: none;
    padding: 0;
    margin: 12px 0;
}
.diag-box ul li {
    padding: 6px 0;
    font-size: 14px;
    color: #3d4a5b;
}
.diag-box ul li::before {
    content: "· ";
    color: #2d7aff;
    font-weight: 700;
}

/* ===== 系统 ===== */
.sys-box {
    background: #fff;
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}
.sys-box .highlight {
    background: #fff8e1;
    padding: 12px 16px;
    border-radius: 8px;
    border-left: 4px solid #ffa000;
    margin-bottom: 16px;
    font-size: 14px;
    color: #b76500;
}
.sys-box .sys-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 16px 0;
}
.sys-box .sys-grid .item {
    background: #f8faff;
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid #eef3fa;
}
.sys-box .sys-grid .item h4 {
    font-size: 16px;
    color: #0b1a2e;
}
.sys-box .sys-grid .item p {
    font-size: 14px;
    color: #4a5a6a;
    margin-top: 4px;
}
.sys-box .sys-grid .item .tag {
    display: inline-block;
    background: #e8f0fe;
    color: #1a3a5c;
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 12px;
    margin-top: 6px;
}

/* ===== 区别 ===== */
.diff-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}
.diff-grid .item {
    background: #fff;
    padding: 24px 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}
.diff-grid .item .icon {
    font-size: 32px;
}
.diff-grid .item h4 {
    font-size: 16px;
    color: #0b1a2e;
    margin-top: 8px;
}
.diff-grid .item p {
    font-size: 14px;
    color: #6b7a8a;
    margin-top: 4px;
}

/* ===== 工厂收获 ===== */
.harvest-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.harvest-grid .item {
    background: #fff;
    padding: 24px 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    text-align: center;
}
.harvest-grid .item .icon {
    font-size: 28px;
}
.harvest-grid .item h4 {
    font-size: 16px;
    color: #0b1a2e;
    margin-top: 8px;
}
.harvest-grid .item p {
    font-size: 14px;
    color: #6b7a8a;
    margin-top: 4px;
}

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(145deg, #0b1a2e, #1a3a5c);
    color: #fff;
    padding: 50px 20px;
    text-align: center;
}
.cta-section h2 {
    font-size: 26px;
    font-weight: 700;
}
.cta-section p {
    opacity: 0.8;
    margin-top: 10px;
    font-size: 15px;
}
.cta-section .btn-group {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-top: 24px;
    flex-wrap: wrap;
}

/* ===== 高亮 ===== */
.highlight-box {
    background: #e8f5e9;
    padding: 16px 20px;
    border-radius: 8px;
    border-left: 4px solid #22a65e;
    font-size: 14px;
    color: #1a5c2e;
    margin-bottom: 16px;
}

/* ===== 结果网格 ===== */
.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 12px 0;
}
.result-grid .item {
    background: #f8faff;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    border: 1px solid #eef3fa;
}

/* ===== 表单 ===== */
.form-box {
    background: #fff;
    border-radius: 16px;
    padding: 32px 28px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}
.form-box .form-group {
    margin-bottom: 16px;
}
.form-box .form-group label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    color: #1a2a3a;
    margin-bottom: 4px;
}
.form-box .form-group input,
.form-box .form-group select,
.form-box .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #d0dce8;
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border 0.2s;
}
.form-box .form-group input:focus,
.form-box .form-group select:focus,
.form-box .form-group textarea:focus {
    outline: none;
    border-color: #2d7aff;
    box-shadow: 0 0 0 3px rgba(45, 122, 255, 0.08);
}
.form-box .form-group textarea {
    resize: vertical;
    min-height: 80px;
}
.form-box .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-box .btn-submit {
    background: #2d7aff;
    color: #fff;
    border: none;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.form-box .btn-submit:hover {
    background: #1a5fd9;
}

/* ===== 联系信息 ===== */
.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
    margin-top: 16px;
}
.contact-info .item {
    background: #f8faff;
    padding: 20px 16px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid #eef3fa;
}
.contact-info .item .icon {
    font-size: 30px;
    display: block;
    margin-bottom: 4px;
}
.contact-info .item h4 {
    font-size: 15px;
    color: #0b1a2e;
}
.contact-info .item p {
    font-size: 14px;
    color: #4a5a6a;
}

/* ===== 页脚 ===== */
.footer {
    background: #0b1a2e;
    color: rgba(255, 255, 255, 0.6);
    padding: 30px 20px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.footer .footer-links {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.footer .footer-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
}
.footer .footer-links a:hover {
    color: #fff;
}
.footer .copy {
    font-size: 13px;
}

/* ===== 按钮通用 ===== */
.btn-primary {
    display: inline-block;
    padding: 10px 28px;
    background: #2d7aff;
    color: #fff;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-primary:hover {
    background: #1a5fd9;
}

/* ===== 页面标题（内页用） ===== */
.page-hero {
    background: linear-gradient(145deg, #0b1a2e 0%, #1a3a5c 50%, #1f4a7a 100%);
    color: #fff;
    padding: 50px 20px 60px;
    text-align: center;
}
.page-hero h1 {
    font-size: 32px;
    font-weight: 800;
}
.page-hero p {
    opacity: 0.85;
    margin-top: 8px;
    font-size: 16px;
}

/* ============================================================
   移动端响应式
   ============================================================ */

/* 平板及以下 */
@media (max-width: 768px) {
    .hero {
        padding: 50px 20px 60px;
    }
    .hero h1 {
        font-size: 24px;
    }
    .hero .sub-title {
        font-size: 16px;
    }
    .hero .desc {
        font-size: 14px;
    }
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    .hero-buttons .btn {
        padding: 14px 20px;
        font-size: 16px;
        width: 100%;
        text-align: center;
    }

    .section-title h2 {
        font-size: 22px;
    }
    .section-title p {
        font-size: 14px;
    }
    .section {
        padding: 30px 0;
    }

    .card {
        padding: 20px 16px;
    }
    .card p {
        font-size: 16px;
        line-height: 1.8;
    }
    .container {
        padding: 0 16px;
    }

    .grid-2,
    .grid-3,
    .grid-4,
    .two-blocks,
    .diff-grid,
    .harvest-grid,
    .sys-box .sys-grid,
    .result-grid,
    .contact-info,
    .learn-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .steps {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    .steps .step {
        padding: 16px 12px;
    }
    .steps .step .num {
        font-size: 24px;
    }

    .form-box {
        padding: 20px 16px;
    }
    .form-box .form-row {
        grid-template-columns: 1fr;
    }
    .form-box .btn-submit {
        width: 100%;
        text-align: center;
    }

    .learn-templates .tmpl {
        font-size: 15px;
    }
    .learn-templates .tmpl .download {
        font-size: 14px;
    }

    .sys-box {
        padding: 20px 16px;
    }

    .footer .footer-links {
        gap: 16px;
    }
    .footer .footer-links a {
        font-size: 14px;
    }

    .btn-primary,
    .btn-submit {
        display: block;
        width: 100%;
        text-align: center;
        padding: 14px 20px;
        font-size: 16px;
    }

    .cta-section {
        padding: 40px 20px;
    }
    .cta-section h2 {
        font-size: 22px;
    }
    .cta-section .btn-group {
        flex-direction: column;
        align-items: stretch;
    }
    .cta-section .btn-group .btn {
        width: 100%;
        text-align: center;
    }

    .diag-box {
        padding: 20px 16px;
    }

    .page-hero {
        padding: 40px 20px 50px;
    }
    .page-hero h1 {
        font-size: 24px;
    }

    /* 文章页面调整 */
    .article-list .article-item {
        padding: 18px 16px;
    }
    .article-list .article-item h3 {
        font-size: 16px;
    }
    .article-list .article-item .summary {
        font-size: 14px;
    }
    .download-section {
        padding: 20px 16px;
    }
    .download-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 20px;
    }
    .hero .sub-title {
        font-size: 14px;
    }
    .section-title h2 {
        font-size: 20px;
    }
    .steps {
        grid-template-columns: 1fr;
    }
    .steps .step {
        padding: 14px 12px;
    }
    .grid-item {
        padding: 16px 14px;
    }
    .card {
        padding: 16px 14px;
    }
    .card p {
        font-size: 15px;
    }
    .form-box {
        padding: 16px 14px;
    }
    .form-box .form-group input,
    .form-box .form-group select,
    .form-box .form-group textarea {
        font-size: 16px;
        padding: 12px 14px;
    }
    .sys-box .sys-grid .item {
        padding: 14px 16px;
    }
    .diff-grid .item {
        padding: 18px 16px;
    }
    .harvest-grid .item {
        padding: 18px 16px;
    }
    .contact-info .item {
        padding: 16px 14px;
    }
    .page-hero h1 {
        font-size: 20px;
    }
}