/* ===== 云储动力 官方网站 — 样式文件 ===== */
/* GEO 优化：简洁语义化、移动优先、加载快 */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:#1a1a2e;background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* --- Utility --- */
.container{max-width:1200px;margin:0 auto;padding:0 1.25rem}
.section{padding:4rem 0}
.section-gray{background:#f8f9fb}
.section-dark{background:#1a1a2e;color:#fff}
.section-blue{background:#1a56db;color:#fff}
.text-center{text-align:center}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* --- Tagline --- */
.tagline{display:inline-block;font-size:.8125rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:#1a56db;margin-bottom:.75rem}
.tagline-white{color:rgba(255,255,255,.75)}

/* --- Headings --- */
h1{font-size:2.25rem;font-weight:800;line-height:1.2;margin-bottom:.75rem}
h2{font-size:1.75rem;font-weight:700;line-height:1.3;margin-bottom:.5rem}
h3{font-size:1.25rem;font-weight:600;line-height:1.4;margin-bottom:.5rem}
.subtitle{color:#6b7280;font-size:1.0625rem;max-width:640px;margin:0 auto 2.5rem}
.subtitle-white{color:rgba(255,255,255,.7)}
@media(min-width:768px){
  h1{font-size:3rem}
  h2{font-size:2.25rem}
  .section{padding:5rem 0}
}

/* --- Navigation --- */
nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid #eaeef2}
nav .container{display:flex;align-items:center;justify-content:space-between;height:4rem}
.nav-logo{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.125rem;color:#1a1a2e}
.nav-logo img{height:2.25rem;width:auto}
.nav-links{display:none;gap:2rem;font-size:.875rem;font-weight:500;color:#4b5563}
.nav-links a:hover,.nav-links a.active{color:#1a56db}
.nav-toggle{display:block;background:none;border:none;cursor:pointer;padding:.5rem;color:#1a1a2e}
.nav-toggle svg{width:1.5rem;height:1.5rem}
@media(min-width:768px){
  .nav-links{display:flex}
  .nav-toggle{display:none}
}
.mobile-menu{display:none;border-top:1px solid #eaeef2;background:#fff;padding:.75rem 1.25rem}
.mobile-menu.show{display:block}
.mobile-menu a{display:block;padding:.625rem 0;font-size:.875rem;font-weight:500;color:#4b5563;border-bottom:1px solid #f3f4f6}
.mobile-menu a:last-child{border-bottom:none}
.mobile-menu a:hover{color:#1a56db}

/* --- Buttons --- */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.75rem;border-radius:9999px;font-weight:600;font-size:.9375rem;transition:all .2s;border:none;cursor:pointer}
.btn-primary{background:#1a56db;color:#fff;box-shadow:0 4px 12px rgba(26,86,219,.25)}
.btn-primary:hover{background:#1648c0;transform:translateY(-1px);box-shadow:0 6px 20px rgba(26,86,219,.35)}
.btn-outline{background:transparent;color:#1a1a2e;border:2px solid #d1d5db}
.btn-outline:hover{border-color:#9ca3af}
.btn-white{background:#fff;color:#1a1a2e}
.btn-white:hover{background:#f3f4f6}
.btn-lg{padding:.875rem 2.25rem;font-size:1rem}

/* --- Hero --- */
.hero{padding:3rem 0;text-align:center}
.hero h1{margin-bottom:.5rem}
.hero p{font-size:1.125rem;color:#6b7280;margin-bottom:.25rem;max-width:720px;margin-left:auto;margin-right:auto}
.hero-cta{margin-top:2rem;display:flex;flex-wrap:wrap;justify-content:center;gap:.75rem}
.hero-trust{margin-top:1.25rem;font-size:.8125rem;color:#9ca3af;display:flex;align-items:center;justify-content:center;gap:.375rem}
.hero-trust svg{width:1rem;height:1rem;color:#10b981}
@media(min-width:768px){
  .hero{padding:5rem 0}
}

/* --- Grid Cards --- */
.card-grid{display:grid;gap:1.5rem;margin:0 auto}
.card-grid-3{grid-template-columns:1fr}
.card-grid-4{grid-template-columns:repeat(2,1fr)}
@media(min-width:768px){
  .card-grid-3{grid-template-columns:repeat(3,1fr)}
  .card-grid-4{grid-template-columns:repeat(4,1fr)}
}
.card{background:#fff;border-radius:1rem;padding:2rem;border:1px solid #eaeef2;transition:box-shadow .2s}
.card:hover{box-shadow:0 8px 24px rgba(0,0,0,.06)}
.card-icon{width:2.75rem;height:2.75rem;border-radius:.75rem;display:flex;align-items:center;justify-content:center;margin-bottom:1rem;font-size:1.25rem}
.card h3{font-size:1.125rem;margin-bottom:.5rem}
.card p{color:#6b7280;font-size:.9375rem;line-height:1.6}
.card-featured{border:2px solid #1a56db;position:relative}
.card-featured .badge{position:absolute;top:-.75rem;right:1.5rem;background:#1a56db;color:#fff;font-size:.75rem;font-weight:600;padding:.25rem .75rem;border-radius:9999px}
.card-dark{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.1)}
.card-dark h3{color:#fff}
.card-dark p{color:rgba(255,255,255,.7)}

/* --- Stats --- */
.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem;max-width:720px;margin:0 auto}
@media(min-width:768px){.stats-grid{grid-template-columns:repeat(4,1fr)}}
.stat-item{text-align:center}
.stat-number{font-size:2.25rem;font-weight:800;color:#1a56db;margin-bottom:.25rem}
.stat-label{color:#6b7280;font-size:.875rem}
.stat-item-white .stat-number{color:#fff}
.stat-item-white .stat-label{color:rgba(255,255,255,.7)}

/* --- Table --- */
.table-wrap{overflow-x:auto;border-radius:1rem;border:1px solid #eaeef2;background:#fff}
table{width:100%;border-collapse:collapse;font-size:.875rem}
thead{background:#f8f9fb}
th{padding:1rem;font-weight:600;color:#1a1a2e;text-align:left}
td{padding:.875rem 1rem;border-top:1px solid #f3f4f6;color:#4b5563}
tr:hover{background:#f8f9fb}
td.highlight{background:#eff6ff;color:#1a56db;font-weight:500}

/* --- CTA --- */
.cta-section{text-align:center;padding:4rem 0}
.cta-section h2{color:#fff;margin-bottom:.75rem}
.cta-section p{color:rgba(255,255,255,.7);margin-bottom:2rem;max-width:540px;margin-left:auto;margin-right:auto}
.cta-section .contact-meta{margin-top:1.25rem;font-size:.8125rem;color:rgba(255,255,255,.5)}

/* --- Footer --- */
footer{background:#1a1a2e;color:rgba(255,255,255,.6);padding:3rem 0 1.5rem;font-size:.875rem}
footer .container>div:first-child{display:flex;flex-direction:column;align-items:center;gap:1.5rem;padding-bottom:2rem;border-bottom:1px solid rgba(255,255,255,.08)}
footer .footer-links{display:flex;gap:1.5rem;flex-wrap:wrap;justify-content:center}
footer a:hover{color:#fff}
footer .copyright{padding-top:1.5rem;text-align:center;font-size:.8125rem;color:rgba(255,255,255,.4)}
@media(min-width:768px){
  footer .container>div:first-child{flex-direction:row;justify-content:space-between}
}

/* --- Article / Blog --- */
.article-card{display:block;border-bottom:1px solid #eaeef2;padding:1.5rem 0}
.article-card:last-child{border-bottom:none}
.article-card h3{font-size:1.125rem;margin-bottom:.375rem;color:#1a1a2e}
.article-card p{color:#6b7280;font-size:.875rem;margin-bottom:.375rem}
.article-meta{font-size:.75rem;color:#9ca3af}

/* --- Contact --- */
.contact-grid{display:grid;gap:2rem;grid-template-columns:1fr}
@media(min-width:768px){.contact-grid{grid-template-columns:1fr 1fr}}
.contact-info-item{display:flex;gap:.75rem;margin-bottom:1.25rem}
.contact-info-item .icon{width:2.5rem;height:2.5rem;background:#eff6ff;border-radius:.625rem;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#1a56db}
.contact-info-item h3{font-size:.9375rem;margin-bottom:.125rem}
.contact-info-item p{color:#6b7280;font-size:.875rem}

/* --- Form --- */
.form-group{margin-bottom:1rem}
.form-group label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.375rem;color:#374151}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:.75rem 1rem;border:1px solid #d1d5db;border-radius:.625rem;font-size:.9375rem;font-family:inherit;transition:border-color .2s;background:#fff}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:#1a56db;box-shadow:0 0 0 3px rgba(26,86,219,.1)}
.form-group textarea{min-height:120px;resize:vertical}

/* --- GEO: FAQ structured --- */
.faq-item{border-bottom:1px solid #eaeef2;padding:1rem 0}
.faq-item:first-child{border-top:1px solid #eaeef2}
.faq-q{font-weight:600;font-size:.9375rem;color:#1a1a2e;margin-bottom:.375rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-a{color:#6b7280;font-size:.875rem;line-height:1.6;display:none;padding-top:.375rem}
.faq-item.open .faq-a{display:block}
.faq-toggle{font-size:.875rem;color:#9ca3af;transition:transform .2s}
.faq-item.open .faq-toggle{transform:rotate(180deg)}

/* --- Process steps --- */
.process-steps{display:flex;flex-direction:column;gap:1.5rem;counter-reset:step}
.process-step{display:flex;gap:1rem;align-items:flex-start}
.process-step .step-num{width:2.5rem;height:2.5rem;border-radius:50%;background:#eff6ff;color:#1a56db;font-weight:700;font-size:.875rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.process-step h3{font-size:1rem;margin-bottom:.25rem}
.process-step p{color:#6b7280;font-size:.875rem}
@media(min-width:768px){
  .process-steps{flex-direction:row}
  .process-step{flex:1}
}