.dark-header{background:rgba(10,13,20,.94);color:#fff;border-color:rgba(255,255,255,.1)}.back-link{text-decoration:none;color:#c3c9d3;font-size:.9rem}.case-loading{min-height:70vh;padding:100px 6vw}.case-hero{position:relative;overflow:hidden;background:var(--dark);color:#fff;padding:clamp(70px,10vw,130px) clamp(22px,7vw,110px) 85px}.case-hero:after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:var(--case-accent);right:-190px;top:-240px;filter:blur(160px);opacity:.34}.case-breadcrumb,.case-title,.case-summary,.case-meta{position:relative;z-index:1}.case-breadcrumb{font-size:.74rem;color:#a7afbd;text-transform:uppercase;letter-spacing:.13em}.case-title{max-width:1050px;font-size:clamp(3.5rem,9vw,8.5rem);line-height:.84;letter-spacing:-.07em;margin:40px 0 30px}.case-summary{max-width:820px;color:#c2c8d2;font-size:clamp(1.08rem,1.8vw,1.35rem)}.case-meta{display:grid;grid-template-columns:1fr 1fr;gap:30px;max-width:800px;margin-top:55px;padding-top:24px;border-top:1px solid rgba(255,255,255,.16)}.case-meta span{display:block;color:#7f8898;font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;margin-bottom:5px}.case-section{max-width:1250px;margin:auto;padding:100px clamp(22px,5vw,60px)}.case-section.intro-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,8vw,110px)}.case-section h2{font-size:clamp(2.3rem,4.7vw,4.7rem);line-height:.96;letter-spacing:-.05em;margin:0 0 24px}.case-section p{color:var(--muted);font-size:1.06rem}.case-section h3{font-size:1.25rem;margin:0 0 12px}.context-card{padding:30px;border-radius:22px;background:#fff;border:1px solid var(--line)}.context-card.problem{background:#e9edff}.built-section{background:#fff;max-width:none}.built-inner{max-width:1250px;margin:auto}.built-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:40px;counter-reset:built}.built-item{padding:24px;border:1px solid var(--line);border-radius:18px;background:var(--bg);display:grid;grid-template-columns:40px 1fr;gap:14px}.built-item:before{counter-increment:built;content:"0" counter(built);color:var(--blue);font-weight:800}.process-band{background:var(--dark);color:#fff;max-width:none}.process-inner{max-width:1250px;margin:auto}.process-flow{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-top:40px}.process-flow span{position:relative;padding:22px 14px;min-height:110px;border:1px solid rgba(255,255,255,.14);border-radius:15px;color:#d8dce4}.process-flow span:after{content:"→";position:absolute;right:-10px;top:42px;color:var(--case-accent);z-index:2}.process-flow span:last-child:after{display:none}.tech-list{display:flex;flex-wrap:wrap;gap:9px;margin-top:30px}.tech-list span{padding:.58rem .75rem;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.13);font-size:.82rem}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:38px}.result-card{min-height:210px;padding:25px;border-radius:20px;background:#fff;border:1px solid var(--line)}.result-card b{display:block;color:var(--blue);font-size:.76rem;margin-bottom:45px}.learning{padding:clamp(40px,7vw,80px);border-radius:30px;background:var(--lime);margin-top:80px}.learning blockquote{max-width:920px;margin:0;font-size:clamp(1.7rem,3.3vw,3.4rem);line-height:1.08;letter-spacing:-.04em}.case-links{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}.next-project{display:flex;justify-content:space-between;align-items:center;gap:30px;text-decoration:none;border-top:1px solid var(--line);padding-top:34px;margin-top:80px}.next-project span{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em}.next-project strong{font-size:clamp(1.4rem,3vw,2.5rem)}.case-cover{max-width:1250px;margin:-38px auto 0;padding:0 clamp(22px,5vw,60px);position:relative;z-index:2}.case-cover img{display:block;width:100%;max-height:620px;object-fit:contain;background:#fff;border-radius:24px;box-shadow:var(--shadow);border:1px solid var(--line)}
@media(max-width:850px){.case-section.intro-grid,.built-grid,.result-grid{grid-template-columns:1fr}.process-flow{grid-template-columns:repeat(2,1fr)}.process-flow span:after{display:none}.case-meta{grid-template-columns:1fr}.case-title{font-size:4.2rem}}
@media(max-width:520px){.process-flow{grid-template-columns:1fr}.case-title{font-size:3.4rem}.learning{padding:30px 24px}.next-project{align-items:flex-start;flex-direction:column}}

/* 中文备注：Case Study 以数据分析过程为主线，突出输入、方法、发现和决策。 */
.data-inputs{margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}
.data-inputs>span,.method-strip>span,.decision-callout>span,.product-callout>span{display:block;margin-bottom:14px;color:var(--blue);font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}
.data-inputs ul{margin:0;padding-left:1.2rem;color:var(--muted)}
.data-inputs li+li{margin-top:8px}
.analysis-section{max-width:none;background:var(--dark);color:#fff}
.analysis-inner{max-width:1250px;margin:auto}
.analysis-section .section-intro{max-width:760px;color:#aeb5c2}
.analysis-timeline{display:grid;gap:12px;margin-top:48px}
.analysis-timeline article{display:grid;grid-template-columns:64px minmax(0,1fr);gap:18px;padding:25px;border:1px solid rgba(255,255,255,.13);border-radius:18px;background:rgba(255,255,255,.035)}
.analysis-timeline article>b{color:var(--case-accent);font-size:.78rem;letter-spacing:.08em}
.analysis-timeline h3{color:#fff;margin-bottom:8px}
.analysis-timeline p{margin:0;color:#aeb5c2}
.contribution-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.7fr);gap:60px;align-items:start}
.method-strip{padding:28px;border:1px solid var(--line);border-radius:20px;background:#fff}
.method-strip .tech-list{margin-top:0}
.method-strip .tech-list span{color:var(--text);background:var(--bg);border-color:var(--line)}
.findings-section{padding-top:20px}
.outcome-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:70px}
.decision-callout,.product-callout{padding:clamp(30px,4vw,52px);border-radius:28px}
.decision-callout{background:var(--lime)}
.decision-callout>span{color:#26352e}
.decision-callout p,.product-callout p{margin:0;font-size:clamp(1.22rem,2vw,1.8rem);line-height:1.2;letter-spacing:-.025em}
.decision-callout p{color:#17221d}
.product-callout{background:var(--blue);color:#fff}
.product-callout>span{color:#cdd7ff}
.product-callout p{color:#fff}
.limits-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.limits-grid>div{padding:28px;border:1px solid var(--line);border-radius:20px;background:#fff}
.limits-grid p{margin-bottom:0}
@media(max-width:850px){.contribution-head,.outcome-grid,.limits-grid{grid-template-columns:1fr}.contribution-head{gap:18px}}
@media(max-width:520px){.analysis-timeline article{grid-template-columns:44px minmax(0,1fr);gap:10px}.decision-callout,.product-callout{padding:24px}}