:root{--ink:#162233;--muted:#667284;--line:#dbe1e9;--blue:#2456db;--canvas:#f3f5f8;--white:#fff;--red:#ab2635;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);font-size:16px;line-height:1.65;background:var(--canvas)}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}a{color:var(--blue)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #789aff;outline-offset:3px}[hidden]{display:none!important}.app-shell{max-width:1440px;margin:0 auto;display:grid;grid-template-columns:290px minmax(0,1fr);min-height:100vh}.sidebar{background:#142238;color:#fff;padding:38px 28px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:650;letter-spacing:.04em}.brand-mark{width:44px;height:44px;border:1px solid #66768d;display:grid;place-items:center;border-radius:10px;font-size:23px}.brand-sub{display:block;font-size:13px;font-weight:400;color:#bac9dd;letter-spacing:.06em}.side-intro{font-size:23px;line-height:1.6;font-weight:500;margin:45px 0 34px}.step{display:flex;gap:13px;align-items:center;text-align:left;width:100%;border:0;background:transparent;color:#b3c3d9;padding:13px 12px;border-radius:8px;margin:5px 0;font-size:15px}.step.current{background:#293e5e;color:#fff}.step-number{width:28px;height:28px;display:grid;place-items:center;border:1px solid #69809e;border-radius:50%;font-size:13px;flex-shrink:0}.step.current .step-number{background:#fff;border-color:#fff;color:#142238}.side-foot{margin-top:auto;padding-top:35px;font-size:13px;color:#b3c3d9}.side-foot p{margin:8px 0}.app-shell main{min-width:0;padding:30px 56px 20px}.topbar{display:flex;justify-content:space-between;gap:12px;font-size:14px;color:var(--muted);padding-bottom:25px;border-bottom:1px solid var(--line);margin-bottom:32px}#save-status{font-size:13px}.eyebrow{font-size:13px;letter-spacing:.14em;color:var(--blue);font-weight:650;margin:0 0 8px}.section-title{font-size:32px;line-height:1.3;letter-spacing:-.03em;margin:0 0 12px}h1{font-size:32px;line-height:1.3;margin:5px 0 12px}h2{font-size:21px;line-height:1.5}.section-description{color:var(--muted);margin:0 0 22px;font-size:16px}.intro-note{font-size:14px;color:var(--muted);margin-bottom:26px;max-width:670px}.question{margin:0 0 20px;background:var(--white);padding:25px 27px;border:1px solid var(--line);border-radius:12px}.question-title{font-weight:650;font-size:18px;line-height:1.6;margin:0 0 7px}.question-number{font-size:13px;font-weight:600;color:var(--blue);margin-right:10px}.hint{font-size:14px;color:var(--muted);line-height:1.75;margin:0 0 20px}.field{margin:18px 0 0}.field>label,.field>legend{display:block;font-size:15px;font-weight:500;margin-bottom:9px}.field>legend{padding:0}fieldset.field{border:0;padding:0;min-width:0}.required{color:var(--red);font-size:13px;font-weight:400;margin-left:7px}.optional{font-weight:400;color:var(--muted);font-size:13px;margin-left:7px}input[type=text],input[type=password],textarea,select{display:block;width:100%;border:1px solid #cbd4df;border-radius:7px;background:#fff;padding:11px 13px;font-size:16px;color:var(--ink);min-height:47px}textarea{min-height:108px;resize:vertical;line-height:1.75}input::placeholder,textarea::placeholder{color:#7b8795;font-size:14px}select{padding-right:25px}.choices{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.choice{display:flex;align-items:flex-start;gap:9px;border:1px solid var(--line);border-radius:7px;padding:12px 13px;min-height:49px;font-size:15px;cursor:pointer;line-height:1.6;background:#fff}.choice:has(input:checked){background:#eef3ff;border-color:#8ba7ed}.choice input{accent-color:var(--blue);width:17px;height:17px;flex-shrink:0;margin:4px 0 0}.error{color:var(--red);font-size:14px;margin:6px 0 0}.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:var(--red)}.actions{position:sticky;bottom:0;background:rgba(243,245,248,.98);display:flex;gap:12px;align-items:center;padding:20px 0 16px;border-top:1px solid var(--line);margin-top:30px;z-index:5}.actions #save{margin-left:auto}.primary,.secondary,.text-button,.button{border-radius:7px;padding:11px 22px;border:1px solid transparent;font-weight:550;font-size:15px;min-height:46px;text-align:center;text-decoration:none;display:inline-flex;justify-content:center;align-items:center}.primary{background:var(--blue);color:#fff}.primary:hover{background:#1944b7}.secondary{background:#fff;border-color:#ccd5e1;color:var(--ink)}.secondary:hover{background:#eef2f8}.text-button{background:transparent;color:var(--muted);padding-left:12px;padding-right:12px}.text-button:hover{color:var(--blue)}.privacy-foot{font-size:12px;color:var(--muted);margin-top:15px}.notice{padding:14px 0;color:var(--red);font-size:15px}.mobile-progress{display:none}.success{padding:45px 0}.success-symbol{height:64px;width:64px;border-radius:50%;display:grid;place-items:center;background:#e2edff;color:var(--blue);font-size:32px;margin-bottom:28px}.receipt{font-size:14px;color:var(--muted)}.review-block{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 24px;margin:15px 0}.review-block h2{margin:0 0 12px}.answer-row{border-bottom:1px solid #edf0f4;padding:10px 0}.answer-row:last-child{border:0}.answer-label{font-size:13px;color:var(--muted);margin-bottom:5px}.answer-value{font-size:15px;white-space:pre-wrap;overflow-wrap:anywhere}.review-edit{margin-top:15px}.review-consent{font-size:14px;padding:14px 0}.access-message{margin:60px 0;max-width:580px}.muted{color:var(--muted)}.admin-main{max-width:1040px;margin:auto;padding:44px 32px}.admin-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:36px}.login-panel{max-width:480px;padding:30px;background:#fff;border:1px solid var(--line);border-radius:12px;margin-top:40px}.login-panel h2{margin-top:0}.login-panel label{display:block;margin-bottom:8px}.login-panel button{margin-top:20px;width:100%}.admin-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:22px;flex-wrap:wrap}.admin-toolbar .button,.admin-toolbar button{font-size:14px;padding:9px 15px}.response{background:#fff;border:1px solid var(--line);border-radius:10px;margin:16px 0;overflow:hidden}.response>summary{cursor:pointer;padding:22px;display:flex;justify-content:space-between;gap:20px;list-style:none}.response>summary::after{content:'展开';font-size:13px;color:var(--blue)}.response[open]>summary::after{content:'收起'}.response-name{font-weight:650}.response-meta{color:var(--muted);font-size:13px}.response-body{padding:0 25px 25px}.response-body h3{font-size:17px;border-top:1px solid var(--line);padding-top:25px;margin-top:15px}.empty{padding:55px 25px;text-align:center;background:#fff;border:1px dashed var(--line);border-radius:10px;color:var(--muted)}
@media(min-width:1440px){body{background:#e8edf3}.app-shell main{background:var(--canvas)}}
@media(max-width:1050px){.app-shell{grid-template-columns:240px minmax(0,1fr)}.sidebar{padding:30px 20px}.app-shell main{padding:25px 30px 16px}.side-intro{font-size:20px}.choices{grid-template-columns:1fr}}
@media(max-width:700px){.app-shell{display:block}.sidebar{position:static;height:auto;padding:18px 20px;display:block}.brand{font-size:18px}.brand-mark{width:36px;height:36px;font-size:20px}.brand-sub{font-size:12px}.side-intro,.side-foot,#steps{display:none}.app-shell main{padding:19px 18px 12px}.topbar{font-size:13px;padding-bottom:14px;margin-bottom:15px}.mobile-progress{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:25px}.mobile-progress progress{accent-color:var(--blue);width:100%;height:5px}.mobile-progress label{white-space:nowrap}.section-title,h1{font-size:27px}.section-description{font-size:15px}.question{padding:21px 18px;border-radius:9px;margin-bottom:15px}.question-title{font-size:17px}.question-number{margin-right:6px}.hint{font-size:14px}.choice{font-size:15px;padding:12px}.choices{gap:8px}.actions{gap:8px;padding:15px 0}.primary,.secondary{padding:11px 14px;font-size:14px}.text-button{font-size:13px;padding:10px 7px}.privacy-foot{font-size:12px}.review-block{padding:19px}.admin-main{padding:26px 18px}.admin-heading{align-items:flex-start}.admin-toolbar{display:block}.admin-toolbar>div{display:flex;gap:6px;flex-wrap:wrap}.response>summary{padding:18px;gap:8px}.response-body{padding:0 18px 20px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.actions,.privacy-foot,.admin-toolbar,#logout,.mobile-progress{display:none}.app-shell{display:block}.app-shell main,.admin-main{padding:0}.question,.review-block,.response{break-inside:avoid}.response-body{display:block}}

/* 由来科技品牌配色；保留现有问卷与后台的结构样式。 */
:root{--ink:#202731;--muted:#64748a;--line:#dce6f5;--blue:#1764e8;--canvas:#f5f8ff}
body{background:var(--canvas)}
.sidebar{background:#fff;color:var(--ink);border-right:1px solid var(--line)}
.brand{display:block}
.brand-logo{display:block;width:260px;height:85px;object-fit:cover;object-position:center;margin-left:-11px}
.side-intro{font-size:22px;line-height:1.5;margin:30px 0 28px}
.step{color:#526781}
.step:hover{background:#f3f8ff;color:#135ad4}
.step.current{background:#edf4ff;color:#135ad4}
.step-number{border-color:#b0c7e9}
.step.current .step-number{background:var(--blue);border-color:var(--blue);color:#fff}
.side-foot{color:#65758c}
.choice:hover{border-color:#7ea9ef}
.choice:has(input:checked){background:#edf4ff;border-color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}
.primary:hover{background:#0e4fcc}
.actions{background:rgba(245,248,255,.98)}
.topbar span:first-child{font-weight:650;color:#345578}
@media(max-width:700px){.sidebar{border-right:0;border-bottom:1px solid var(--line);padding:14px 20px}.brand-logo{width:225px;height:74px;margin-left:-9px}.topbar span:first-child{max-width:190px}}