/* Shared account / management surfaces; no changes to the science or game canvases. */
:root{--c-ink:#163f43;--c-muted:#617b7b;--c-accent:#167767;--c-edge:#d5e5df;--c-bg:#f2f7f3;--c-warn:#99552c}
.center-body{margin:0;background:var(--c-bg);color:var(--c-ink);font:15px/1.65 system-ui,"Microsoft YaHei",sans-serif}
.center-body *{box-sizing:border-box}.center-body [hidden],.center-tabs~[hidden]{display:none!important}
.center-body a{color:var(--c-accent)}.center-body button,.center-body input,.center-body select,.center-body textarea{font:inherit}
.center-body button,.center-body .button{cursor:pointer;border:1px solid var(--c-edge);border-radius:10px;padding:10px 16px;background:#fff;color:var(--c-ink);text-decoration:none}
.center-body button:disabled{opacity:.5;cursor:not-allowed}.center-body .primary{background:var(--c-accent);color:white;border-color:var(--c-accent)}
.center-body .danger{color:#a13532;border-color:#e9c4c0}.center-body input,.center-body select,.center-body textarea{width:100%;min-width:0;border:1px solid #b9cfca;border-radius:9px;padding:11px;background:#fff;color:var(--c-ink)}
.center-body input[type=checkbox]{width:auto;accent-color:var(--c-accent)}
.center-body label{display:grid;gap:6px;margin:12px 0}.center-body .check{display:flex;align-items:flex-start;gap:10px}
.center-body :focus-visible{outline:3px solid #b4ac58;outline-offset:3px}.center-body .eyebrow,.center-eyebrow{font-size:11px;letter-spacing:.2em;color:var(--c-accent);font-weight:700}
.center-header{max-width:1440px;margin:auto;padding:24px 4%;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--c-edge)}
.center-brand{font-weight:750;font-size:18px;display:flex;align-items:center;gap:12px;text-decoration:none}.center-brand img{width:44px;height:44px}.center-brand small{display:block;font-size:9px;letter-spacing:.16em}
.center-header nav{display:flex;gap:20px;align-items:center}.center-shell{max-width:1360px;margin:32px auto;padding:0 28px 50px;display:grid;grid-template-columns:210px minmax(0,1fr);gap:30px}
.center-sidebar{position:sticky;top:24px;align-self:start}.center-sidebar .side-label{color:var(--c-muted);font-size:11px;letter-spacing:.16em;margin:24px 14px 10px}
.center-sidebar button{display:block;width:100%;text-align:left;border:0;background:transparent;margin:5px 0;padding:14px 16px}
.center-sidebar button[aria-current=true]{background:#dceee5;color:#0a5c50;font-weight:750}.center-sidebar .side-note{font-size:12px;color:var(--c-muted);margin:24px 14px}
.center-main{min-width:0}.center-main h1{font-size:32px;letter-spacing:-.04em;margin:3px 0 12px}.center-main h2{font-size:20px;margin:2px 0 14px}.center-main h3{font-size:16px;margin:3px 0 6px}
.center-lead{color:var(--c-muted);margin-top:0;max-width:65ch}.center-card{background:#fff;border:1px solid var(--c-edge);border-radius:18px;padding:25px;margin:20px 0;min-width:0}
.center-card.tint{background:#e9f3ed}.center-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.center-grid .center-card{margin:0}
.center-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.center-stat{border:1px solid var(--c-edge);border-radius:14px;padding:18px;background:#fff}.center-stat b{display:block;font-size:22px;margin:7px 0}.muted,.center-note{color:var(--c-muted)}
.center-note{font-size:13px}.center-notice{padding:14px 18px;border:1px solid #bfdccd;border-radius:12px;background:#e9f5ee;margin:0 0 20px;overflow-wrap:anywhere}.center-notice.error{color:#8f362c;background:#fff3eb;border-color:#ebc9b6}
.center-row{display:flex;align-items:center;gap:12px;justify-content:space-between;flex-wrap:wrap}.center-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.center-search{display:grid;grid-template-columns:minmax(160px,1fr) 120px auto;gap:10px;align-items:end}
.center-search label{margin:0}.center-list{display:grid;gap:12px}.center-item{border:1px solid var(--c-edge);border-radius:12px;padding:18px;overflow-wrap:anywhere}.center-item p{margin:6px 0;color:var(--c-muted);font-size:13px}
.center-item h3{margin:0 0 6px}.center-tag{display:inline-block;border-radius:20px;padding:3px 10px;font-size:12px;background:#e3f1e7;color:#245d42}.center-tag.off{background:#f1f0ec;color:#747065}.center-tag.caution{background:#fcf0d8;color:#886123}
.center-pager{display:flex;align-items:center;gap:14px;justify-content:flex-end;margin-top:14px}.center-rule{border-top:1px solid var(--c-edge);margin:20px 0;padding-top:18px}.center-table{width:100%;border-collapse:collapse;font-size:13px}.center-table td,.center-table th{text-align:left;padding:12px;border-bottom:1px solid var(--c-edge)}
.center-scroll{overflow:auto}.center-code-output{min-height:125px;font-family:ui-monospace,monospace!important;font-size:12px!important;white-space:pre;overflow:auto}
.center-dialog{width:min(560px,calc(100% - 32px));max-height:88vh;overflow:auto;border:1px solid var(--c-edge);border-radius:20px;padding:28px;color:var(--c-ink)}.center-dialog::backdrop{background:#15352a70;backdrop-filter:blur(3px)}
.center-empty{padding:22px;border:1px dashed #c5d5ce;border-radius:12px;color:var(--c-muted)}.center-footer{border-top:1px solid var(--c-edge);padding:20px;font-size:12px;text-align:center;color:var(--c-muted)}
/* Student center keeps existing account-security and model-record DOM contracts. */
.profile-layout.center-profile{max-width:1200px}.center-tabs{display:flex;gap:8px;border-bottom:1px solid var(--c-edge);margin:10px 0 24px;padding-bottom:12px}.center-tabs button{border:0;background:transparent;padding:12px 24px;border-radius:10px;color:var(--c-muted);font-weight:700;cursor:pointer}
.center-tabs button[aria-selected=true]{background:#1f7564;color:white}.center-profile .settings-column{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;align-items:start}.center-profile .settings-column .panel{margin:0}.center-profile .profile-hero{margin-bottom:24px}.center-profile .learning-panel{min-width:0}
.center-profile .center-item button{font:inherit;padding:8px 14px;border:1px solid var(--c-edge);border-radius:8px;background:white;color:var(--c-accent);cursor:pointer}.center-profile .center-card{box-shadow:none}.center-profile .center-item a{color:var(--c-accent)}
.center-profile .center-grid{margin:20px 0}.center-profile [hidden]{display:none!important}.center-profile .rights-code{max-width:740px}.center-profile .future-note{display:none}
.center-profile .settings-column{align-items:stretch}.personal-card,.security-card{min-width:0;display:flex;flex-direction:column}.personal-card .account-details{margin-top:12px}.account-details dd{overflow-wrap:anywhere}
.nickname-row [data-nickname-view]{display:flex;align-items:center;flex-wrap:wrap;gap:16px}.nickname-row [data-nickname-text]{font-size:20px;font-weight:750}.nickname-editor{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.nickname-editor input{flex:1 1 130px;min-width:0}.nickname-editor button{flex:none}.nickname-row fieldset{margin:0;padding:0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.profile-feedback{margin-top:auto;padding-top:22px;border-top:1px solid var(--c-edge)}.profile-feedback h3,.security-history h3{font-size:16px;margin:0 0 6px}.security-action{padding:0!important;border:0!important;border-bottom:1px solid var(--c-edge)!important;border-radius:0!important}.security-action summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 0;list-style:none;font-weight:700;cursor:pointer;color:var(--c-ink)}.security-action summary::-webkit-details-marker{display:none}.security-action summary:after{content:'+';font-size:22px;color:var(--c-accent)}.security-action[open] summary:after{content:'−'}.security-action summary span{margin-left:auto;font-size:12px;font-weight:400;color:var(--c-muted)}.security-action form{padding:0 0 20px}.security-history{margin-top:auto;padding-top:26px}.security-history .phone-events{max-height:180px;overflow:auto;padding-right:8px}.security-history .small-note{margin-bottom:14px}
.rights-services{align-items:stretch}.rights-services .service-card{padding:28px;display:flex;flex-direction:column;min-height:210px;border-radius:20px}.service-card h3{font-size:23px;margin:8px 0 6px}.service-card .service-kicker{font-size:10px;letter-spacing:.18em;color:var(--c-muted);font-weight:750}.service-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:auto;padding-top:20px}
.center-profile .access-button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:12px 10px;border:1px solid #a9ccc0;border-bottom:4px solid #89b9a8;border-radius:12px;background:linear-gradient(#fff,#e2f3ea);color:#1a6656;font-weight:700;font-size:14px;text-decoration:none;text-align:center;box-shadow:0 4px 8px #1d625916;transition:transform .15s,box-shadow .15s}.center-profile a.access-button:hover{transform:translateY(-2px);box-shadow:0 7px 12px #1d625925}.center-profile a.access-button:active{transform:translateY(1px)}.center-profile .access-button:disabled{border:1px solid #dce3df;background:#edf1ee;color:#87958f;box-shadow:none;cursor:not-allowed;opacity:1}.access-button:disabled small{font-size:10px;font-weight:400}.service-card .center-note{margin:3px 0 0}.service-card.models-card .service-buttons,.service-card.ark-card .service-buttons,.service-card.shop-card .service-buttons{grid-template-columns:1fr}
.rights-services .ark-card{color:#e9ddb7;border:1px solid #bda569;border-radius:18px 4px 18px 4px;background:linear-gradient(95deg,#051923ef,#0519238f),url('/assets/life-ark-nav.png') center 57%/cover no-repeat;position:relative;overflow:hidden}.ark-card:before{content:'';position:absolute;right:24px;top:22px;width:35px;height:2px;background:#82ded6;box-shadow:0 0 10px #82ded6}.ark-card h3{color:#f4e4b4;letter-spacing:.08em}.ark-card .service-kicker,.ark-card .center-note{color:#b4c9c8}.center-profile .ark-card .access-button{background:linear-gradient(#efdfb2,#c4af73);border-color:#ddcb97;border-bottom-color:#927f4f;color:#132f36}.center-profile .ark-card .access-button:disabled{background:#183039;border:1px solid #36515b;color:#7f989e;box-shadow:none}.shop-card{background:#f8faf7}.center-profile .rights-code{max-width:none;margin-top:22px}.redemption-history{margin-top:22px}.redemption-history section{padding-top:20px}
@media(max-width:540px){.nickname-editor button{padding:10px 12px}.security-action summary span{max-width:130px;text-align:right}.rights-services .service-card{padding:22px}.service-buttons{gap:10px}.center-profile .access-button{font-size:13px}.profile-feedback{margin-top:22px}}
@media(max-width:540px){.center-header{flex-direction:column;align-items:flex-start;gap:12px}.center-header .center-brand{white-space:nowrap}.center-header nav{width:100%;flex-wrap:wrap;justify-content:flex-start}.center-header nav>span{flex-basis:100%}.center-dialog p,.center-note{overflow-wrap:anywhere}}
@media(max-width:800px){.center-shell{grid-template-columns:1fr;padding:0 16px;margin:20px auto;gap:18px}.center-sidebar{position:static;display:flex;overflow-x:auto;gap:6px;padding-bottom:6px}.center-sidebar .side-label,.center-sidebar .side-note{display:none}.center-sidebar button{width:auto;flex:none;margin:0;padding:10px 13px}.center-header{padding:18px 16px}.center-header nav{gap:10px;font-size:12px}.center-brand{font-size:14px}.center-brand img{width:34px;height:34px}.center-three{grid-template-columns:1fr}.center-main h1{font-size:27px}.center-grid,.center-profile .settings-column{grid-template-columns:1fr}.center-search{grid-template-columns:1fr 100px}.center-search button{grid-column:1/-1}.center-card{padding:20px}.center-tabs button{padding:11px 15px}.center-profile .profile-hero{align-items:flex-start;gap:14px}.center-dialog{padding:22px}.center-pager{justify-content:flex-start;flex-wrap:wrap}}