:root{--blue:#1265e8;--ink:#15213a;--muted:#65738b;--line:#dfe7f2;--soft:#f7faff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font-family:Arial,"Microsoft YaHei",sans-serif}.page-shell{width:min(1440px,calc(100% - 40px));margin:auto}.band-hero{background:linear-gradient(102deg,#fff 0%,#fff 47%,#f6f9ff 100%)}.hero-layout{min-height:480px;display:grid;grid-template-columns:.9fr 1.1fr;align-items:center}.hero-copy{padding-left:35px;max-width:610px}.hero-copy h1{margin:0 0 20px;font-size:48px;line-height:1.18;letter-spacing:0}.hero-copy p{margin:0;color:#5c6b83;font-size:18px;line-height:1.9}.hero-actions{display:flex;gap:22px;margin-top:32px}.btn{height:54px;padding:0 31px;display:inline-flex;align-items:center;justify-content:center;gap:17px;border:1px solid var(--blue);border-radius:5px;font-size:17px;font-weight:700;text-decoration:none;transition:.22s}.btn:hover{transform:translateY(-3px);box-shadow:0 10px 20px #1265e828}.btn-primary{background:var(--blue);color:#fff}.btn-outline{background:#fff;color:var(--blue)}.hero-image{width:112%;max-width:760px;max-height:440px;justify-self:center;object-fit:contain;mix-blend-mode:multiply}.feature-band{padding:0 0 27px}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.feature-grid article{min-height:148px;padding:24px 22px;display:flex;align-items:center;gap:19px;border:1px solid var(--line);border-radius:7px;background:#fff;box-shadow:0 5px 18px rgba(29,70,130,.05);transition:.22s}.feature-grid article:hover,.scene-grid article:hover,.advantage-grid article:hover{transform:translateY(-4px);border-color:#9bbcf4;box-shadow:0 12px 24px rgba(25,80,165,.1)}.feature-grid img{width:76px;height:76px;flex:0 0 76px;object-fit:contain;mix-blend-mode:multiply}.feature-grid h2{margin:0 0 8px;font-size:20px}.feature-grid p{margin:0;color:var(--muted);font-size:15px;line-height:1.65}.page-section{padding:31px 0}.page-section.compact{padding-top:15px}.section-title{margin:0 0 28px;text-align:center;font-size:31px;line-height:1.25}.section-title:before,.section-title:after{content:"";display:inline-block;width:58px;margin:0 20px 8px;border-top:2px solid #3f82ed;vertical-align:middle}.plan-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}.plan-card{position:relative;min-height:350px;padding:25px 28px 23px;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:7px;background:#fff;box-shadow:0 5px 16px rgba(31,72,130,.04);transition:.22s}.plan-card:hover{transform:translateY(-4px);border-color:#88adf1;box-shadow:0 13px 26px rgba(26,78,160,.1)}.plan-card.featured{border-color:#8db4f5}.badge{position:absolute;left:-1px;top:-1px;padding:5px 12px;border-radius:7px 0 7px 0;background:#2c72e8;color:#fff;font-size:14px;font-weight:700}.plan-card h3{margin:0 0 13px;text-align:center;font-size:20px}.price{margin:0 0 16px;color:var(--blue);font-size:30px;font-weight:800}.price small{color:#4e5e76;font-size:15px;font-weight:500}.plan-card ul{flex:1;margin:0;padding:0;list-style:none}.plan-card li{padding:6px 0;color:#53647d;font-size:15px}.plan-card li:before{content:"✓";margin-right:10px;color:#1265e8;font-weight:800}.plan-card>a{height:40px;display:grid;place-items:center;border-radius:4px;background:var(--blue);color:#fff;font-size:16px;font-weight:700;text-decoration:none}.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:21px}.scene-grid article{min-height:126px;padding:20px 23px;display:flex;align-items:center;gap:18px;border:1px solid var(--line);border-radius:7px;background:#fff;transition:.22s}.scene-grid img{width:68px;height:68px;flex:0 0 68px;object-fit:contain}.scene-grid h3,.advantage-grid h3{margin:0 0 7px;font-size:19px}.scene-grid p,.advantage-grid p{margin:0;color:var(--muted);font-size:14px;line-height:1.62}.network-section{padding-bottom:25px}.advantage-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.advantage-grid article{min-height:126px;padding:18px 17px;display:flex;align-items:center;gap:13px;border:1px solid var(--line);border-radius:7px;background:#fff;transition:.22s}.advantage-grid img{width:60px;height:60px;flex:0 0 60px;object-fit:contain}.faq-section{padding-top:19px;padding-bottom:46px}.faq-grid{display:grid;grid-template-columns:repeat(2,1fr);border:1px solid var(--line);border-radius:6px;overflow:hidden}.faq-grid article{min-height:88px;padding:15px 22px;border-bottom:1px solid var(--line)}.faq-grid article:nth-child(odd){border-right:1px solid var(--line)}.faq-grid article:nth-last-child(-n+2){border-bottom:0}.faq-grid h3{margin:0 0 6px;font-size:17px}.faq-grid h3 span{font-weight:800}.faq-grid p{margin:0;color:#68768c;font-size:14px;line-height:1.55}.faq-grid p span{color:#34445e}.contact-rail{position:fixed;right:18px;top:50%;z-index:900;width:82px;overflow:hidden;border:1px solid #e0e7f1;border-radius:9px;background:#fff;box-shadow:0 8px 24px rgba(20,56,111,.12);transform:translateY(-50%)}.contact-rail a,.contact-rail button{width:100%;min-height:92px;padding:12px 5px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;border:0;border-bottom:1px solid #e9edf4;background:#fff;color:#17243a;font:600 14px Arial,"Microsoft YaHei",sans-serif;text-decoration:none;cursor:pointer}.contact-rail button{border-bottom:0}.contact-rail img{width:42px;height:42px;padding:8px;border-radius:50%;background:#1265e8}.chat-dot{width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:#1265e8;color:#fff;font-size:18px;letter-spacing:1px}.contact-rail a:hover,.contact-rail button:hover{background:#f2f7ff}@media(max-width:820px){.feature-grid,.plan-grid,.scene-grid{grid-template-columns:repeat(2,1fr)}.advantage-grid{grid-template-columns:repeat(3,1fr)}.hero-copy{padding-left:0}}@media(max-width:700px){.hero-layout{grid-template-columns:1fr;padding:45px 0 25px}.hero-copy h1{font-size:36px}.hero-image{width:100%;max-height:310px}.feature-grid,.plan-grid,.scene-grid,.advantage-grid,.faq-grid{grid-template-columns:1fr}.faq-grid article:nth-child(odd){border-right:0}.faq-grid article:nth-last-child(2){border-bottom:1px solid var(--line)}.section-title{font-size:27px}.section-title:before,.section-title:after{width:30px;margin-left:10px;margin-right:10px}.feature-grid article{min-height:125px}}




/* Native 1055px reference proportions */
.hero-layout{min-height:292px}
.hero-copy{padding-left:24px;max-width:490px}
.hero-copy h1{margin-bottom:12px;font-size:34px}
.hero-copy p{font-size:13px;line-height:1.7}
.hero-actions{margin-top:20px;gap:14px}
.btn{height:42px;padding:0 23px;gap:12px;font-size:14px}
.hero-image{max-width:620px;max-height:285px}
.feature-band{padding-bottom:18px}
.feature-grid{gap:14px}
.feature-grid article{min-height:112px;padding:13px 15px;gap:12px}
.feature-grid img{width:58px;height:58px;flex-basis:58px}
.feature-grid h2{margin-bottom:4px;font-size:16px}
.feature-grid p{font-size:11px;line-height:1.55}
.page-section{padding:18px 0}
.page-section.compact{padding-top:8px}
.section-title{margin-bottom:17px;font-size:24px}
.section-title:before,.section-title:after{width:42px;margin:0 15px 6px;border-top-width:1px}
.plan-grid{gap:14px}
.plan-card{min-height:225px;padding:15px 18px 14px}
.plan-card h3{margin-bottom:7px;font-size:15px}
.price{margin-bottom:8px;font-size:24px}
.price small{font-size:11px}
.plan-card li{padding:2px 0;font-size:11px}
.plan-card li:before{margin-right:7px}
.plan-card>a{height:32px;font-size:12px}
.badge{padding:3px 8px;font-size:10px}
.scene-grid{gap:14px}
.scene-grid article{min-height:92px;padding:13px 15px;gap:12px}
.scene-grid img{width:52px;height:52px;flex-basis:52px}
.scene-grid h3,.advantage-grid h3{margin-bottom:3px;font-size:15px}
.scene-grid p,.advantage-grid p{font-size:10.5px;line-height:1.5}
.network-section{padding-bottom:13px}
.advantage-grid{gap:10px}
.advantage-grid article{min-height:94px;padding:11px 10px;gap:9px}
.advantage-grid img{width:48px;height:48px;flex-basis:48px}
.faq-section{padding-top:9px;padding-bottom:22px}
.faq-grid article{min-height:58px;padding:8px 14px}
.faq-grid h3{margin-bottom:2px;font-size:11.5px}
.faq-grid p{font-size:10px;line-height:1.4}
@media(max-width:820px){.hero-layout{min-height:420px}.hero-copy h1{font-size:32px}.hero-copy p{font-size:14px}.feature-grid article{min-height:130px}.feature-grid p{font-size:12px}.scene-grid p,.advantage-grid p{font-size:11px}}


/* Final native-height alignment */
.feature-grid article{min-height:94px;padding:10px 13px}
.feature-grid img{width:52px;height:52px;flex-basis:52px}
.feature-grid h2{font-size:15px}
.feature-grid p{font-size:10px}
.page-section{padding:13px 0}
.section-title{margin-bottom:12px;font-size:22px}
.plan-card{min-height:172px;padding:10px 14px}
.plan-card h3{margin-bottom:3px;font-size:14px}
.price{margin-bottom:4px;font-size:21px}
.plan-card li{padding:0;font-size:10px;line-height:1.55}
.plan-card>a{height:27px;font-size:11px}
.scene-grid article{min-height:69px;padding:8px 11px}
.scene-grid img{width:44px;height:44px;flex-basis:44px}
.scene-grid h3,.advantage-grid h3{font-size:14px}
.scene-grid p,.advantage-grid p{font-size:9.5px}
.advantage-grid article{min-height:68px;padding:7px 8px}
.advantage-grid img{width:40px;height:40px;flex-basis:40px}
.faq-grid article{min-height:36px;padding:4px 10px}
.faq-grid h3{font-size:10px}
.faq-grid p{font-size:9px}
.faq-section{padding-top:5px;padding-bottom:14px}


/* Body typography +2px and roomier spacing; shared header/footer stay untouched. */
.hero-copy h1{font-size:36px}
.hero-copy p{font-size:15px;line-height:1.78}
.hero-actions{margin-top:24px;gap:18px}
.btn{font-size:16px;height:46px;padding-left:27px;padding-right:27px}
.feature-band{padding-bottom:24px}
.feature-grid{gap:20px}
.feature-grid article{min-height:112px;padding:15px 17px;gap:15px}
.feature-grid h2{font-size:17px}
.feature-grid p{font-size:12px;line-height:1.62}
.page-section{padding:19px 0}
.page-section.compact{padding-top:13px}
.section-title{margin-bottom:18px;font-size:24px}
.plan-grid{gap:20px}
.plan-card{min-height:208px;padding:15px 18px}
.plan-card h3{margin-bottom:6px;font-size:16px}
.price{margin-bottom:7px;font-size:23px}
.price small{font-size:13px}
.plan-card li{padding:2px 0;font-size:12px;line-height:1.55}
.plan-card>a{height:32px;font-size:13px}
.badge{font-size:12px;padding:4px 10px}
.scene-grid{gap:20px}
.scene-grid article{min-height:92px;padding:13px 16px;gap:15px}
.scene-grid h3,.advantage-grid h3{font-size:16px}
.scene-grid p,.advantage-grid p{font-size:11.5px;line-height:1.58}
.advantage-grid{gap:15px}
.advantage-grid article{min-height:91px;padding:12px 11px;gap:11px}
.faq-section{padding-top:12px;padding-bottom:26px}
.faq-grid article{min-height:54px;padding:8px 14px}
.faq-grid h3{margin-bottom:3px;font-size:12px}
.faq-grid p{font-size:11px;line-height:1.5}


/* Enlarge smallest body copy and all small module icons. */
.feature-grid img{width:68px;height:68px;flex-basis:68px}
.feature-grid p{font-size:14px}
.feature-grid article{min-height:138px;padding:17px 18px;gap:17px}
.plan-card{min-height:232px}
.price small{font-size:15px}
.plan-card li{font-size:14px}
.plan-card>a{font-size:15px}
.badge{font-size:14px}
.scene-grid img{width:57px;height:57px;flex-basis:57px}
.scene-grid p,.advantage-grid p{font-size:13.5px}
.scene-grid article{min-height:112px;padding:15px 17px;gap:16px}
.advantage-grid img{width:52px;height:52px;flex-basis:52px}
.advantage-grid article{min-height:112px;padding:14px 12px;gap:12px}
.faq-grid h3{font-size:14px}
.faq-grid p{font-size:13px}
.faq-grid article{min-height:72px;padding:11px 15px}


/* FAQ +2px; visually enlarge icons without changing card geometry. */
.faq-grid h3{font-size:16px}
.faq-grid p{font-size:15px}
.feature-grid img,.scene-grid img,.advantage-grid img{transform:scale(1.3);transform-origin:center}


/* IDC3 bandwidth plans: wider three-card layout with hover-switched regions. */
.plans-shell{width:min(1440px,calc(100% - 40px));margin:auto}
.region-tabs{width:min(760px,100%);margin:0 auto 24px;padding:6px;display:grid;grid-template-columns:repeat(2,1fr);gap:8px;border:1px solid #dbe6f7;border-radius:7px;background:#f5f8fd}
.region-tab{height:48px;border:1px solid transparent;border-radius:5px;background:transparent;color:#34445e;font:700 17px Arial,"Microsoft YaHei",sans-serif;cursor:pointer;transition:.2s}
.region-tab:hover,.region-tab.active{border-color:var(--blue);background:var(--blue);color:#fff;box-shadow:0 7px 16px rgba(18,101,232,.18)}
.region-panel[hidden]{display:none}
.plans-shell .plan-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}
.plans-shell .plan-card{min-height:300px;padding:25px 30px 24px}
.plans-shell .plan-card h3{min-height:26px;margin-bottom:11px;font-size:20px}
.plans-shell .price{margin-bottom:13px;text-align:center;font-size:30px}
.plans-shell .price small{margin-left:4px;font-size:16px}
.plans-shell .plan-card li{padding:5px 0;font-size:16px}
.plans-shell .plan-card>a{height:42px;font-size:16px}
@media(max-width:980px){.plans-shell .plan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.plans-shell .plan-grid{grid-template-columns:1fr}.region-tab{font-size:15px}.plans-shell .plan-card{min-height:280px}}


/* Refined bandwidth module proportions. */
.region-tabs{width:min(480px,100%);margin-bottom:26px}
.plans-shell .plan-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
.plans-shell .plan-card{min-height:360px;padding:28px 25px 25px}
.plans-shell .plan-card h3{min-height:52px;margin-bottom:13px;font-size:20px;line-height:1.4}
.plans-shell .price{margin-bottom:16px;font-size:30px}
.plans-shell .plan-card ul{padding-top:3px}
.plans-shell .plan-card li{padding:7px 0;font-size:16px;line-height:1.55}
.plans-shell .plan-card>a{height:44px;font-size:16px}
.scene-grid article{min-height:150px;padding:22px 24px;gap:22px}
.scene-grid img{width:64px;height:64px;flex-basis:64px}
.scene-grid h3{margin-bottom:8px;font-size:19px}
.scene-grid p{font-size:16px;line-height:1.72}
.advantage-grid article{min-height:150px;padding:21px 18px;gap:17px}
.advantage-grid img{width:60px;height:60px;flex-basis:60px}
.advantage-grid h3{margin-bottom:8px;font-size:19px}
.advantage-grid p{font-size:15px;line-height:1.72}
.faq-grid article{min-height:104px;padding:18px 22px}
.faq-grid h3{margin-bottom:10px;font-size:17px;line-height:1.55}
.faq-grid p{font-size:16px;line-height:1.75}
@media(max-width:820px){.plans-shell .plan-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.plans-shell .plan-grid{grid-template-columns:1fr}.scene-grid,.advantage-grid{grid-template-columns:1fr}}