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

:root {
    --primary: #1e6fff;
    --primary-dark: #0050d0;
    --primary-light: #e8f1ff;
    --accent: #ff6a00;
    --accent-red: #e83929;
    --dark: #222;
    --text: #333;
    --text-secondary: #666;
    --text-light: #999;
    --border: #e8e8e8;
    --bg-gray: #f5f7fa;
    --bg-white: #fff;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-hover: 0 6px 24px rgba(30,111,255,0.12);
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg-white);
    color: var(--text);
    line-height: 1.6;
    font-size: 14px;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* === Top Bar === */
.top-bar {
    background: #2b3a50;
    color: #c0c8d4;
    font-size: 12px;
    height: 36px;
    line-height: 36px;
}
.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.top-bar a { color: #c0c8d4; }
.top-bar a:hover { color: #fff; }
.top-bar-right { display: flex; gap: 20px; }

/* === Main Nav === */
.main-nav {
    background: #fff;
    border-bottom: 2px solid var(--primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.main-nav .container {
    display: flex;
    align-items: center;
    height: 70px;
}
.nav-logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-right: 60px;
    white-space: nowrap;
}
.nav-logo span { color: var(--accent); }
.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
    flex: 1;
}
.nav-menu > li { position: relative; }
.nav-menu > li > a {
    display: block;
    padding: 0 22px;
    height: 70px;
    line-height: 70px;
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
}
.nav-menu > li > a:hover,
.nav-menu > li.active > a {
    color: var(--primary);
    background: var(--primary-light);
}
.nav-menu > li > a .hot-tag {
    display: inline-block;
    background: var(--accent-red);
    color: #fff;
    font-size: 10px;
    padding: 1px 4px;
    border-radius: 2px;
    margin-left: 4px;
    vertical-align: top;
    margin-top: 20px;
    line-height: 14px;
}
.nav-phone {
    font-size: 18px;
    font-weight: 700;
    color: var(--accent);
    white-space: nowrap;
}
.nav-phone small { display: block; font-size: 11px; color: var(--text-light); font-weight: 400; }

/* === Hero Banner === */
.hero-banner {
    background: linear-gradient(135deg, #0a1628 0%, #122a5c 40%, #1a3f7a 100%);
    padding: 0;
    position: relative;
    overflow: hidden;
}
.hero-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(30,111,255,0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: 10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(118,185,0,0.1) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-inner {
    display: flex;
    align-items: center;
    min-height: 420px;
    position: relative;
    z-index: 1;
}
.hero-text { flex: 1; padding: 60px 0; }
.hero-text h1 {
    font-size: 36px;
    color: #fff;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}
.hero-text h1 em {
    font-style: normal;
    color: #76b900;
}
.hero-text p {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 32px;
    max-width: 500px;
    line-height: 1.8;
}
.hero-btns { display: flex; gap: 16px; }
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
    text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: 0 4px 16px rgba(30,111,255,0.3); }
.btn-green { background: #76b900; color: #fff; }
.btn-green:hover { background: #5a8f00; color: #fff; box-shadow: 0 4px 16px rgba(118,185,0,0.3); }
.btn-outline-white { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.4); }
.btn-outline-white:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }

.hero-visual {
    width: 380px;
    text-align: center;
    position: relative;
}
.hero-gpu-icon {
    width: 260px;
    height: 180px;
    background: linear-gradient(135deg, rgba(30,111,255,0.2), rgba(118,185,0,0.2));
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    backdrop-filter: blur(10px);
}
.hero-gpu-icon svg { width: 100px; height: 100px; }

/* === Quick Entry Grid (below banner) === */
.quick-entry {
    margin-top: -40px;
    position: relative;
    z-index: 10;
    margin-bottom: 40px;
}
.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
}
.quick-item {
    padding: 28px 20px;
    text-align: center;
    border-right: 1px solid var(--border);
    transition: all 0.3s;
    cursor: pointer;
}
.quick-item:last-child { border-right: none; }
.quick-item:hover { background: var(--primary-light); }
.quick-item .qi-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    transition: all 0.3s;
}
.quick-item:hover .qi-icon { background: var(--primary); color: #fff; }
.quick-item h4 { font-size: 15px; color: var(--text); margin-bottom: 4px; }
.quick-item p { font-size: 12px; color: var(--text-light); }

/* === Section Title === */
.section-title {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 60px;
}
.section-title h2 {
    font-size: 26px;
    color: var(--dark);
    margin-bottom: 10px;
    position: relative;
    display: inline-block;
}
.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}
.section-title p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 16px;
}

/* === Services Tab Section === */
.services-section { background: var(--bg-gray); padding-bottom: 60px; }
.tab-nav {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 36px;
    background: #fff;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}
.tab-btn {
    flex: 1;
    padding: 14px 24px;
    text-align: center;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    background: none;
}
.tab-btn.active {
    color: #fff;
    background: var(--primary);
}
.tab-btn:hover:not(.active) { color: var(--primary); background: var(--primary-light); }

.tab-content { display: none; }
.tab-content.active { display: block; }

.service-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.service-item {
    background: #fff;
    border-radius: 8px;
    padding: 28px 20px;
    text-align: center;
    border: 1px solid var(--border);
    transition: all 0.3s;
    cursor: pointer;
}
.service-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}
.service-item .si-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}
.service-item:hover .si-icon { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
.service-item:hover .si-icon svg path { fill: #fff; }
.service-item h4 { font-size: 15px; color: var(--text); margin-bottom: 8px; font-weight: 600; }
.service-item p { font-size: 12px; color: var(--text-light); line-height: 1.6; }
.service-item .price-tag {
    display: inline-block;
    margin-top: 12px;
    padding: 2px 8px;
    background: #fff3e8;
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    border-radius: 3px;
}

/* === GPU Models Section === */
.models-section { padding-bottom: 60px; }
.models-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.model-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px 16px;
    text-align: center;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.model-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}
.model-card .mc-arch {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--primary);
    color: #fff;
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 2px;
}
.model-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}
.model-card .mc-spec { font-size: 12px; color: var(--text-light); margin-bottom: 10px; }
.model-card .mc-link {
    font-size: 12px;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}
.model-card .mc-link::after { content: '→'; }

/* === Process Section === */
.process-section { background: var(--bg-gray); padding-bottom: 60px; }
.process-flow {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    max-width: 1000px;
    margin: 0 auto;
}
.pf-step {
    flex: 1;
    text-align: center;
    position: relative;
    padding: 0 10px;
}
.pf-step::after {
    content: '';
    position: absolute;
    top: 28px;
    right: -5%;
    width: 30%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--border));
}
.pf-step:last-child::after { display: none; }
.pf-num {
    width: 56px;
    height: 56px;
    margin: 0 auto 14px;
    background: #fff;
    border: 2px solid var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    position: relative;
    z-index: 1;
}
.pf-step h4 { font-size: 14px; color: var(--text); margin-bottom: 6px; font-weight: 600; }
.pf-step p { font-size: 12px; color: var(--text-light); line-height: 1.6; }

/* === Advantages === */
.adv-section { padding-bottom: 60px; }
.adv-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.adv-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px 24px;
    display: flex;
    gap: 20px;
    transition: all 0.3s;
}
.adv-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}
.adv-icon {
    width: 52px;
    height: 52px;
    min-width: 52px;
    background: var(--primary-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}
.adv-card:hover .adv-icon { background: var(--primary); }
.adv-info h4 { font-size: 15px; color: var(--text); margin-bottom: 8px; font-weight: 600; }
.adv-info p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* === Trust Section (Certifications) === */
.trust-section {
    background: var(--bg-gray);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.trust-items {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
    max-width: 900px;
    margin: 0 auto;
}
.trust-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.trust-icon {
    width: 48px;
    height: 48px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}
.trust-item span { font-size: 11px; color: var(--text-light); }

/* === CTA Banner === */
.cta-banner {
    background: linear-gradient(135deg, #0a1628 0%, #1a3f7a 100%);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-banner::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='20' cy='20' r='1' fill='rgba(255,255,255,0.05)'/%3E%3C/svg%3E");
}
.cta-content { position: relative; z-index: 1; }
.cta-content h2 { font-size: 28px; color: #fff; margin-bottom: 12px; }
.cta-content p { color: rgba(255,255,255,0.7); font-size: 15px; margin-bottom: 30px; }
.cta-contacts {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 36px;
    flex-wrap: wrap;
}
.cta-contact-item { text-align: center; }
.cta-contact-item .cci-label { font-size: 12px; color: rgba(255,255,255,0.5); margin-bottom: 4px; }
.cta-contact-item .cci-value { font-size: 20px; color: #fff; font-weight: 700; }

/* === Footer === */
.footer {
    background: #1e2a3a;
    padding: 48px 0 0;
    color: #a0aab8;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 40px;
    padding-bottom: 36px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand h3 { font-size: 20px; color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.8; color: #8899aa; }
.footer-col h4 { font-size: 14px; color: #fff; margin-bottom: 16px; font-weight: 600; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #8899aa; font-size: 13px; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 12px;
    color: #667788;
}

/* === Right Floating Bar === */
.float-bar {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 1px;
    background: var(--border);
    border-radius: 6px 0 0 6px;
    overflow: hidden;
    box-shadow: -2px 0 12px rgba(0,0,0,0.1);
}
.float-item {
    width: 54px;
    height: 54px;
    background: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 10px;
    color: var(--text-secondary);
    gap: 2px;
}
.float-item:hover { background: var(--primary); color: #fff; }
.float-item .fi-icon { font-size: 18px; }

/* === Responsive === */
@media (max-width: 1024px) {
    .service-grid { grid-template-columns: repeat(2, 1fr); }
    .models-grid { grid-template-columns: repeat(3, 1fr); }
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-visual { display: none; }
}
@media (max-width: 768px) {
    .quick-grid { grid-template-columns: repeat(2, 1fr); }
    .service-grid { grid-template-columns: 1fr; }
    .models-grid { grid-template-columns: repeat(2, 1fr); }
    .adv-grid { grid-template-columns: 1fr; }
    .process-flow { flex-direction: column; align-items: center; }
    .pf-step::after { display: none; }
    .nav-menu { display: none; }
    .hero-text h1 { font-size: 26px; }
    .float-bar { display: none; }
    .footer-grid { grid-template-columns: 1fr; }
    .cta-contacts { flex-direction: column; gap: 20px; }
}

.chip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
}

.chip-item {
    background: #f5faff;
    border-radius: 40px;
    padding: 0.7rem 1.2rem;
    font-weight: 500;
    color: #193456;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid #dfebfd;
    transition: 0.15s;
    font-size: 0.95rem;
}

.chip-item i {
    color: #1f5f9e;
    font-size: 1rem;
}

.chip-item:hover {
    background: #e3efff;
    border-color: #76b900;
    transform: translateY(-2px);
}