/* ===== 通用标题（非首屏） ===== */
.section-head {
    text-align: center;
    padding: 80px 0 48px;
}
.section-head h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--fire-red);
    letter-spacing: 4px;
    margin-bottom: 8px;
}
.section-head p {
    color: var(--earth-brown);
    font-size: 16px;
    letter-spacing: 2px;
}
.section-head .line {
    width: 60px;
    height: 3px;
    background: var(--metal-gold);
    margin: 12px auto 0;
}

/* ===== 品牌释义 ===== */
.brand-intro {
    padding: 20px 0 80px;
}
.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.intro-text h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--dark-iron);
    margin-bottom: 16px;
}
.intro-text h3 span {
    color: var(--fire-red);
}
.intro-text p {
    color: var(--text-light);
    line-height: 1.9;
    font-size: 15px;
    margin-bottom: 16px;
}
.color-swatch {
    display: flex;
    gap: 20px;
    margin-top: 28px;
    flex-wrap: wrap;
}
.color-item {
    text-align: center;
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}
.color-block {
    width: 56px;
    height: 56px;
    border-radius: 4px;
    margin-bottom: 6px;
    border: 1px solid rgba(0, 0, 0, 0.06);
}
.intro-logo-display {
    display: flex;
    justify-content: center;
    align-items: center;
}
.banner-large-logo {
    width: 100%;
    max-width: 280px;
    height: auto;
    object-fit: contain;
}

/* ===== 业务服务 ===== */
.services {
    background: var(--white);
    padding: 20px 0 80px;
    border-top: 2px solid rgba(139, 90, 43, 0.1);
    border-bottom: 2px solid rgba(139, 90, 43, 0.1);
}
.service-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 32px;
}
.service-card {
    background: var(--gray-bg);
    padding: 36px 28px 32px;
    border-radius: 8px;
    border-left: 5px solid var(--fire-red);
    transition:
        transform 0.3s,
        box-shadow 0.3s;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(178, 34, 34, 0.08);
}
.service-card .icon {
    font-size: 36px;
    display: block;
    margin-bottom: 12px;
}
.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--fire-red);
    margin-bottom: 6px;
}
.service-card .sub {
    font-size: 13px;
    color: var(--earth-brown);
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 10px;
    display: block;
}
.service-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
}

/* ===== 关于我们 ===== */
.about-us {
    padding: 20px 0 80px;
    background: var(--white);
}
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}
.about-grid h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-iron);
    margin-bottom: 16px;
}
.about-grid h3 span {
    color: var(--fire-red);
}
.about-grid p {
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 16px;
    font-size: 15px;
}
.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 24px;
}
.stat-item {
    text-align: center;
    background: var(--gray-bg);
    padding: 20px 10px;
    border-radius: 8px;
    border-bottom: 3px solid var(--metal-gold);
}
.stat-item .num {
    font-size: 32px;
    font-weight: 700;
    color: var(--fire-red);
}
.stat-item .label {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}
.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--gray-bg);
    border-radius: 12px;
    padding: 40px;
    min-height: 240px;
    border: 1px solid rgba(139, 90, 43, 0.1);
    font-size: 18px;
    color: var(--text-light);
    letter-spacing: 2px;
}

/* ===== 成功案例 ===== */
.cases {
    padding: 20px 0 80px;
    background: var(--gray-bg);
}
.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}
.case-card {
    background: var(--white);
    border-radius: 8px;
    padding: 28px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
    border-top: 4px solid var(--fire-red);
}
.case-card:hover {
    transform: translateY(-6px);
}
.case-card .tag {
    display: inline-block;
    background: var(--fire-red);
    color: var(--white);
    font-size: 11px;
    padding: 2px 12px;
    border-radius: 20px;
    letter-spacing: 0.5px;
    font-weight: 600;
    margin-bottom: 12px;
}
.case-card h4 {
    font-size: 18px;
    margin-bottom: 8px;
}
.case-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 14px;
}
.case-card .result {
    font-weight: 600;
    color: var(--fire-red);
    font-size: 15px;
    border-top: 1px solid #eee;
    padding-top: 12px;
}

/* ===== 客户墙 ===== */
.clients {
    padding: 20px 0 80px;
    background: var(--white);
}
.client-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 30px;
    align-items: center;
    justify-items: center;
}
.client-item {
    background: var(--gray-bg);
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 2px;
    font-size: 14px;
    border: 1px solid #eee;
    transition: all 0.3s;
    opacity: 0.7;
    filter: grayscale(1);
}
.client-item:hover {
    opacity: 1;
    filter: grayscale(0);
    border-color: var(--metal-gold);
}

/* ===== 技术洞察 ===== */
.insights {
    padding: 20px 0 80px;
    background: var(--gray-bg);
}
.insight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}
.insight-card {
    background: var(--white);
    border-radius: 8px;
    padding: 28px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}
.insight-card:hover {
    transform: translateY(-4px);
}
.insight-card .date {
    font-size: 12px;
    color: var(--metal-gold);
    font-weight: 600;
    letter-spacing: 0.5px;
}
.insight-card h4 {
    font-size: 18px;
    margin: 8px 0 10px;
}
.insight-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}
.insight-card a {
    color: var(--fire-red);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    display: inline-block;
    margin-top: 10px;
}
.insight-card a:hover {
    color: var(--earth-brown);
}

/* ===== 联系 + 招聘 ===== */
.contact-hire {
    padding: 20px 0 80px;
    background: var(--white);
    border-top: 2px solid rgba(139, 90, 43, 0.08);
}
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 6px;
    color: var(--dark-iron);
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    transition: border 0.3s;
    background: var(--gray-bg);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--fire-red);
    box-shadow: 0 0 0 3px rgba(178, 34, 34, 0.1);
}
.form-group textarea {
    min-height: 120px;
    resize: vertical;
}
.btn-submit {
    background: var(--fire-red);
    color: var(--white);
    border: none;
    padding: 14px 40px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 2px;
}
.btn-submit:hover:not(:disabled) {
    background: var(--fire-red-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(178, 34, 34, 0.25);
}
.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
#formFeedback {
    margin-top: 16px;
    font-weight: 600;
    display: none;
    padding: 12px 16px;
    border-radius: 6px;
}
#formFeedback.success {
    display: block;
    color: #1a7a3a;
    background: #e6f4ea;
    border: 1px solid #b7e1cd;
}
#formFeedback.error {
    display: block;
    color: var(--fire-red);
    background: #fde8e8;
    border: 1px solid #f5c6c6;
}
.contact-info h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--dark-iron);
}
.contact-info .info-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--text-light);
    font-size: 15px;
}
.contact-info .info-item strong {
    color: var(--dark-iron);
    min-width: 70px;
    flex-shrink: 0;
}
.wechat-area {
    background: var(--gray-bg);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    border: 2px dashed var(--metal-gold);
    margin: 20px 0 28px;
}
.wechat-area .qr-placeholder {
    width: 140px;
    height: 140px;
    background: var(--white);
    margin: 0 auto 12px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #ddd;
    font-size: 13px;
    color: var(--text-light);
    padding: 6px;
}
.wechat-area .qr-placeholder svg {
    width: 80px;
    height: 80px;
    opacity: 0.3;
}
.wechat-area .label {
    font-weight: 700;
    color: var(--dark-iron);
    font-size: 16px;
}
.wechat-area .sub-label {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 4px;
}
.wechat-area .badge-wecom {
    display: inline-block;
    background: var(--fire-red);
    color: var(--white);
    font-size: 11px;
    padding: 2px 14px;
    border-radius: 20px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-top: 8px;
}
.hire-list {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #eee;
}
.hire-list h4 {
    font-size: 20px;
    color: var(--fire-red);
    margin-bottom: 12px;
}
.hire-item {
    background: var(--gray-bg);
    padding: 14px 18px;
    border-radius: 6px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}
.hire-item .role {
    font-weight: 600;
}
.hire-item .loc {
    font-size: 13px;
    color: var(--text-light);
}
.hire-item .badge {
    background: var(--metal-gold);
    color: var(--dark-iron);
    font-size: 11px;
    font-weight: 700;
    padding: 2px 12px;
    border-radius: 20px;
}

/* ===== 模态框 ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(4px);
}
.modal-overlay.active {
    display: flex;
}
.modal-box {
    background: var(--white);
    max-width: 700px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    padding: 40px 36px;
    border-radius: 12px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    animation: modalFade 0.3s ease;
}
@keyframes modalFade {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}
.modal-box .close-btn {
    position: sticky;
    top: 0;
    float: right;
    background: var(--gray-bg);
    border: none;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
    padding: 0 10px;
    border-radius: 4px;
    color: var(--dark-iron);
}
.modal-box .close-btn:hover {
    background: #ddd;
}
.modal-box h2 {
    color: var(--fire-red);
    margin-bottom: 16px;
    border-bottom: 2px solid var(--metal-gold);
    padding-bottom: 10px;
}
.modal-box p,
.modal-box li {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
}
.modal-box ul {
    padding-left: 24px;
    margin: 12px 0;
}

/* ===== 悬浮CTA ===== */
.floating-cta {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
    background: var(--fire-red);
    color: var(--white);
    border: none;
    padding: 14px 28px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 15px;
    box-shadow: 0 8px 30px rgba(178, 34, 34, 0.4);
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: 1px;
    text-decoration: none;
}
.floating-cta:hover {
    transform: scale(1.05);
    background: var(--fire-red-dark);
    box-shadow: 0 12px 40px rgba(178, 34, 34, 0.5);
}

/* ===== 页脚 ===== */
footer {
    background: var(--dark-iron);
    padding: 48px 24px 80px;
    text-align: center;
    border-top: 3px solid var(--fire-red);
}
footer .container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.footer-logo {
    width: 56px;
    height: 56px;
    margin-bottom: 16px;
    object-fit: contain;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 0;
    margin-bottom: 16px;
}
.footer-links a, .footer-icp a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    text-decoration: none;
    transition: color 0.3s;
    padding: 0 8px;
    cursor: pointer;
}
.footer-links a:hover, .footer-icp a:hover {
    color: var(--metal-gold);
}
.footer-links .sep {
    color: rgba(255, 255, 255, 0.2);
    font-size: 14px;
}
.footer-copy {
    color: rgba(255, 255, 255, 0.4);
    font-size: 13px;
    text-align: center;
    line-height: 1.8;
}
.footer-copy .company-full {
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
}
.footer-copy .icp {
    font-size: 12px;
    letter-spacing: 1px;
}
.footer-icp {
    padding: 12px;
}
.footer-icp .icp {
    font-size: 12px;
    letter-spacing: 1px;
}
/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition:
        opacity 0.8s ease,
        transform 0.8s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
.fade-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition:
        opacity 0.8s ease,
        transform 0.8s ease;
}
.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}
.fade-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition:
        opacity 0.8s ease,
        transform 0.8s ease;
}
.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}
@media (max-width: 900px) {
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .banner-large-logo {
        max-width: 200px;
    }
}
@media (max-width: 768px) {
    .banner-title {
        font-size: 30px;
        letter-spacing: 3px;
    }
    .banner-sub {
        font-size: 14px;
        letter-spacing: 3px;
    }
    .banner-slogan {
        font-size: 14px;
    }
    .banner::before {
        font-size: 120px;
        letter-spacing: 20px;
    }
    .section-head h2 {
        font-size: 26px;
    }
    .service-cards {
        grid-template-columns: 1fr;
    }
    .color-swatch {
        gap: 12px;
    }
    .color-block {
        width: 44px;
        height: 44px;
    }
    .about-stats {
        grid-template-columns: 1fr 1fr;
    }
    .case-grid {
        grid-template-columns: 1fr;
    }
    .insight-grid {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .floating-cta {
        padding: 12px 20px;
        font-size: 13px;
        bottom: 20px;
        right: 20px;
    }
    .client-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .wechat-area .qr-placeholder {
        width: 120px;
        height: 120px;
    }
}
@media (max-width: 480px) {
    .banner-title {
        font-size: 24px;
    }
    .banner-big-logo {
        width: 100px;
        height: 100px;
    }
    .btn-main {
        padding: 12px 32px;
        font-size: 14px;
    }
    .about-stats {
        grid-template-columns: 1fr;
    }
    .client-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-links a {
        font-size: 12px;
        padding: 0 4px;
    }
    .footer-links .sep {
        font-size: 12px;
    }
    .footer-copy {
        font-size: 11px;
    }
    .modal-box {
        padding: 28px 20px;
    }
    .wechat-area .qr-placeholder {
        width: 100px;
        height: 100px;
    }
}

/* ========== Toast 提示 ========== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: rgba(13, 27, 51, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #fff;
    padding: 12px 28px;
    border-radius: 40px;
    font-size: 14px;
    z-index: 300;
    opacity: 0;
    transition: all 0.4s ease;
    pointer-events: none;
    box-shadow: var(--shadow-heavy);
}
.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}