:root{--motion-fast:150ms;--motion-panel:160ms;--blue:#246bfd;--navy:#10275c;--muted:#7486aa;--line:#dce9f7;--surface:#fff;--canvas:#eef8ff;--shadow:0 12px 35px rgba(46,99,155,.1)}

*{box-sizing:border-box}
html{overflow-y:scroll}
body{margin:0;color:var(--navy);background:var(--canvas);font-family:Inter,"Microsoft YaHei","PingFang SC",system-ui,sans-serif}
button{font:inherit;cursor:pointer;transition:background-color var(--motion-fast) ease,border-color var(--motion-fast) ease,color var(--motion-fast) ease,transform var(--motion-fast) ease}
button:active:not(:disabled):not(.icon-button):not(.profile-button){transform:scale(.97)}
button:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
input{font:inherit}
.site-shell{min-height:100vh;background:linear-gradient(135deg,#f8fcff 0%,#eaf7ff 55%,#f5fbff 100%)}

.reaction-bar:not([hidden]){display:flex;align-items:center;gap:8px}
.reaction-button{display:inline-flex;align-items:center;gap:5px;min-height:32px;padding:5px 11px;border:1px solid #dce6f2;border-radius:18px;background:#fff;color:#7183a2;font:inherit;font-size:12px}
.reaction-button:hover{border-color:#aac4ed;color:var(--blue)}
.reaction-button.active{border-color:#b8cff5;background:#eef5ff;color:var(--blue)}
.reaction-button:disabled{cursor:wait;opacity:.65}
.reaction-button i{font-size:16px}
.reaction-button b{min-width:8px;font-size:11px;font-weight:700}

.site-header{position:relative;background:#fff;border-bottom:1px solid #e8f0fa}
.site-header-inner{position:relative;display:flex;align-items:center;justify-content:space-between;width:min(1280px,calc(100% - 48px));min-height:76px;margin:0 auto}
.site-brand{display:flex;align-items:center;gap:8px;color:var(--navy);text-decoration:none}
.site-brand-mark{display:block;flex:0 0 42px;width:42px;height:42px;object-fit:contain}
.site-brand strong{font-size:23px;letter-spacing:.05em}
.site-brand span{font-size:20px;font-weight:800}
.site-brand small{color:#8396bb;font-size:11px;font-weight:700;margin-left:3px}
.header-actions{display:flex;align-items:center;gap:18px;min-width:0}
.search-box{display:flex;align-items:center;width:clamp(230px,24vw,320px);padding:0 12px;border-radius:9px;background:#eff7ff;color:#7490c1}
.search-box input{width:100%;min-width:0;height:42px;border:0;outline:0;background:transparent;padding:0 9px;color:var(--navy)}
.icon-button{position:relative;display:grid;place-items:center;flex:0 0 42px;width:42px;height:42px;padding:0;border:0;border-radius:9px;background:transparent;color:var(--navy);font-size:23px;line-height:1;text-decoration:none}
.icon-button>img{display:block;width:22px;height:22px;filter:brightness(0) saturate(100%)}
.icon-button:hover{background:#f1f6ff}
.icon-button span{position:absolute;right:0;top:0;min-width:17px;height:17px;padding:0 4px;border-radius:10px;background:#ff3f5f;color:#fff;font-size:10px;line-height:17px}
.profile-button{display:flex;align-items:center;gap:10px;min-width:0;border:0;background:transparent;color:var(--navy);text-align:left}
.profile-button>span:nth-child(2){display:flex;flex-direction:column;min-width:0}
.profile-button strong{display:block;max-width:190px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.profile-button small{color:var(--muted)}
.profile-button b{color:var(--blue)}
.logout-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;padding:0 11px;border:1px solid #d7e3f1;border-radius:8px;background:#fff;color:#526b97;font-size:12px}
.logout-button:hover{border-color:#b8cce7;background:#f4f8ff;color:var(--navy)}
.avatar{display:grid;place-items:center;flex:0 0 auto;overflow:hidden;width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#ccdfff,#dffbf8);color:#315ba9;font-weight:800}
.avatar img{width:100%;height:100%;object-fit:cover}

main{width:min(1280px,calc(100% - 48px));margin:0 auto;padding:24px 0 12px}
.announcement-card{display:grid;grid-template-columns:170px 1fr;gap:18px;padding:20px 26px;background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:8px;box-shadow:0 4px 18px rgba(46,99,155,.05)}
.announcement-title{display:flex;gap:12px;align-items:flex-start;font-size:19px}
.announcement-title i{font-size:27px;color:var(--blue)}
.announcement-list{min-width:0}
.announcement-list p,.announcement-list a{display:flex;align-items:center;min-width:0;margin:0 0 8px;color:inherit;font-size:14px;text-decoration:none}
.announcement-list p:last-child{margin-bottom:0}
.announcement-list a:last-child{margin-bottom:0}
.announcement-list .announcement-badge{display:inline-block;flex:0 0 auto;margin-right:12px;padding:2px 8px;border-radius:4px;background:#e6f0ff;color:var(--blue);font-weight:800}
.announcement-copy{min-width:0;font-weight:400}
.announcement-loading{color:var(--muted)}

.forum-section{margin-top:24px}
.section-heading{display:flex;align-items:center;margin-bottom:10px}
.section-heading h2{margin:0;font-size:24px}
.section-heading p{margin:2px 0 0;color:var(--muted);font-size:13px}
.section-heading:after{content:"";height:1px;flex:1;background:#cfdfef;margin-left:12px}
.section-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.section-grid.compact{grid-template-columns:repeat(3,minmax(0,1fr))}
.board-card{display:grid;grid-template-columns:auto minmax(0,1fr) minmax(190px,.8fr);align-items:center;gap:18px;min-height:92px;padding:14px 20px;border:1px solid #dfebf7;border-radius:7px;background:rgba(255,255,255,.9);box-shadow:0 3px 14px rgba(46,99,155,.05);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.board-card:hover{transform:translateY(-2px);border-color:#bed5f2;box-shadow:var(--shadow)}
.board-card.locked{opacity:.72}
.board-card.maintenance{border-color:#f0d8ae;background:#fffaf1}.board-card.maintenance:hover{border-color:#e4be7d;box-shadow:0 10px 28px rgba(177,123,39,.12)}
.board-icon{display:grid;place-items:center;width:58px;height:58px;border-radius:50%;font-size:29px;color:var(--accent);background:#e7efff}
.board-icon img{display:block;width:52px;height:52px;object-fit:contain}
.board-info h3{display:flex;align-items:center;gap:7px;margin:0 0 12px;font-size:18px}
.r-badge{padding:2px 6px;border-radius:4px;background:#ff405a;color:white;font-size:10px}
.board-meta{display:flex;gap:22px;color:#8194b7;font-size:13px}
.board-meta span{display:flex;align-items:center;gap:6px}
.latest-topic{min-height:54px;padding-left:20px;border-left:1px solid #d9e6f4}
.latest-topic small{display:block;margin-bottom:6px;color:#8ca0c3}
.latest-topic strong{display:block;overflow:hidden;color:var(--blue);font-size:13px;text-overflow:ellipsis;white-space:nowrap}
.latest-topic span{display:block;margin-top:5px;color:#8294b4;font-size:12px}
.board-empty{color:#9aabc8;font-size:13px}
.latest-topic .board-maintenance-copy{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:2px 7px;margin:0;color:#b87514}.board-maintenance-copy i{grid-row:1/3;font-size:22px}.board-maintenance-copy b{font-size:12px}.latest-topic .board-maintenance-copy small{margin:0;color:#9b7b4c;font-size:11px}
.loading-card{grid-column:1/-1;padding:34px;text-align:center;color:var(--muted)}
footer{display:flex;justify-content:space-between;align-items:center;width:min(1280px,calc(100% - 48px));margin:0 auto;padding:17px 0;color:#8190ad;font-size:12px}
footer div{display:flex;gap:12px}
footer strong{color:#2f4e89}

.login-shell{display:grid;place-items:center;min-height:100vh;padding:24px;background:radial-gradient(circle at 25% 20%,rgba(64,146,255,.22),transparent 34%),linear-gradient(135deg,#eef8ff,#f8fbff)}
.login-card{width:min(430px,100%);padding:42px;border:1px solid #dae8f7;border-radius:18px;background:rgba(255,255,255,.94);box-shadow:0 24px 70px rgba(45,92,145,.18)}
.brand-mark{display:grid;place-items:center;width:54px;height:54px;border-radius:15px;background:var(--blue);color:white;font-size:25px;font-weight:900}
.login-brand-mark{display:grid;place-items:center;width:88px;height:88px;margin:0 auto 14px}
.login-brand-mark img{display:block;width:82px;height:82px;object-fit:contain}
.login-brand-mark+.eyebrow{margin-top:0;text-align:center}
.eyebrow{margin:25px 0 5px;color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.14em}
.login-card h1{margin:0;font-size:28px}
.login-copy{margin:8px 0 26px;color:var(--muted)}
label{display:grid;gap:7px;margin-bottom:16px;color:#455b85;font-size:13px;font-weight:700}
label input{height:44px;padding:0 13px;border:1px solid #cedded;border-radius:8px;outline:0;color:var(--navy)}
label input:focus{border-color:#6ba1ff;box-shadow:0 0 0 3px rgba(36,107,253,.1)}
.password-input{position:relative}.password-input input{box-sizing:border-box;width:100%;padding-right:44px}.password-toggle{position:absolute;top:50%;right:7px;display:grid;place-items:center;width:34px;height:34px;padding:0;border:0;border-radius:7px;background:transparent;color:#7890b4;font-size:18px;transform:translateY(-50%);cursor:pointer}.password-toggle:hover,.password-toggle:focus-visible{outline:0;background:#edf4ff;color:var(--blue)}
.primary-button{display:flex;justify-content:center;align-items:center;gap:9px;width:100%;height:46px;border:0;border-radius:8px;background:var(--blue);color:white;font-weight:800}
.form-error{padding:9px 11px;border-radius:7px;background:#fff0f3;color:#c82d49;font-size:12px}
.registered-login-button{display:flex;align-items:center;justify-content:center;gap:7px;width:100%;height:42px;margin:0 0 10px;border:1px solid #9bbcf0;border-radius:8px;background:#eef5ff;color:#2f68bd;font-weight:800}.registered-login-button[hidden]{display:none}.registered-login-button:hover{border-color:#6f9ce5;background:#e4efff}

.dialog-backdrop{opacity:1;transform:translateY(0);transition:opacity var(--motion-panel) ease,transform var(--motion-panel) ease,display var(--motion-panel) allow-discrete;position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:20px;background:rgba(11,27,53,.48);backdrop-filter:blur(5px)}
.site-shell[hidden],.login-shell[hidden]{display:none}
.dialog-backdrop[hidden],.toast[hidden]{display:none;opacity:0;transform:translateY(4px)}
.dialog-card{position:relative;width:min(430px,100%);padding:34px;border-radius:16px;background:white;box-shadow:0 28px 80px rgba(16,39,92,.28)}
.dialog-card h2{margin:8px 0}
.dialog-card>p{color:var(--muted);line-height:1.6}
.dialog-icon{font-size:34px;color:var(--blue)}
.dialog-close{position:absolute;right:18px;top:18px;border:0;background:transparent;font-size:22px;color:var(--muted)}
.search-dialog{width:min(680px,100%)}
.search-result{display:block;padding:15px 0;border-bottom:1px solid var(--line);color:var(--navy);text-decoration:none}
.search-result strong{display:block}
.search-result span{display:block;margin-top:5px;color:var(--muted);font-size:12px}
.toast{opacity:1;transform:translateY(0);transition:opacity var(--motion-panel) ease,transform var(--motion-panel) ease,display var(--motion-panel) allow-discrete;position:fixed;right:24px;bottom:24px;z-index:40;padding:12px 18px;border-radius:9px;background:#17366f;color:#fff;box-shadow:var(--shadow)}

label textarea{min-height:110px;padding:11px 13px;border:1px solid #cedded;border-radius:8px;outline:0;color:var(--navy);font:inherit;resize:vertical}
label textarea:focus{border-color:#6ba1ff;box-shadow:0 0 0 3px rgba(36,107,253,.1)}
.primary-button[hidden],.secondary-button[hidden]{display:none}
.secondary-button{height:46px;padding:0 18px;border:1px solid #b9d1f1;border-radius:8px;background:#fff;color:#4770ac;font-weight:800}
.quiz-navigation{display:flex;gap:10px}
.quiz-navigation .primary-button{flex:1}
.text-button{display:block;margin:16px auto 0;padding:0;border:0;background:none;color:var(--blue);font-size:13px}
.approval-card .brand-mark{font-size:28px}
.maintenance-card{text-align:center}.maintenance-brand-mark{display:grid;place-items:center;width:100px;height:100px;margin:0 auto 12px}.maintenance-brand-mark img{display:block;width:94px;height:94px;object-fit:contain}.maintenance-card .eyebrow{margin-top:0}.maintenance-card .login-copy{margin-bottom:24px;line-height:1.8;white-space:pre-wrap}.maintenance-note{padding:19px 0;border-top:1px solid #e3edf8;color:#91a4c2;font-size:13px}.maintenance-card .text-button{margin-top:2px}
.rejection-note{margin:-8px 0 18px;padding:12px;border:1px solid #ffd3db;border-radius:8px;background:#fff3f5;color:#bd3350;font-size:13px;line-height:1.6}
.approval-card input[type="file"]{width:100%;min-height:50px;padding:6px;border:1px dashed #9bbdf0;border-radius:8px;background:#f7fbff;color:#627a9f;cursor:pointer}
.approval-card input[type="file"]::file-selector-button{height:36px;margin-right:10px;padding:0 13px;border:0;border-radius:6px;background:#e8f1ff;color:var(--blue);font:700 13px Inter,"Microsoft YaHei",sans-serif;cursor:pointer}
.approval-card input[type="file"]:hover{border-color:#5b95f3;background:#f2f8ff}
.approval-card input[type="file"]:focus{border-color:#5b95f3;box-shadow:0 0 0 3px rgba(36,107,253,.1)}
.quiz-upload-status,.text-length-hint{display:block;margin-top:7px;color:#7891b5;font-size:12px}
.optional-page-copy{margin:0 0 18px;padding:11px 13px;border-radius:8px;background:#f0f6ff;color:#6983ad;font-size:13px;line-height:1.5}
.optional-badge{display:inline-block;margin-left:7px;padding:1px 6px;border-radius:4px;background:#edf3ff;color:#6688c2;font-size:11px;font-weight:700}
.approval-card .quiz-field-invalid{border-color:#e65367;box-shadow:0 0 0 3px rgba(230,83,103,.13);animation:quiz-invalid-shake 360ms ease-in-out}
.approval-card input[type="file"].quiz-field-invalid{border-color:#e65367;background:#fff4f6}
@keyframes quiz-invalid-shake{0%,100%{transform:translateX(0)}
20%,60%{transform:translateX(-6px)}
40%,80%{transform:translateX(6px)}
}

@starting-style{.dialog-backdrop,.toast{opacity:0;transform:translateY(4px)}
}

@media(prefers-reduced-motion:reduce){:root{--motion-fast:0ms;--motion-panel:0ms}
.board-card{transition:none}
.board-card:hover,button:active:not(:disabled){transform:none}
}

@media(max-width:1024px){main{width:100%;padding:18px}
.announcement-card{grid-template-columns:1fr}
.announcement-list p,.announcement-list a{white-space:nowrap;overflow:hidden}
.announcement-copy{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.section-grid,.section-grid.compact{grid-template-columns:1fr}
.board-card{grid-template-columns:auto minmax(0,1fr)}
.latest-topic{grid-column:1/-1;padding:10px 0 0;border-left:0;border-top:1px solid var(--line)}
footer{width:100%;padding:16px 20px}
}

@media(max-width:520px){main{padding-left:12px;padding-right:12px}
.board-card{grid-template-columns:46px minmax(64px,.65fr) minmax(0,1.35fr);align-items:start;gap:10px;padding:14px}
.board-icon{width:46px;height:46px;background:transparent;font-size:28px}
.board-icon img{width:46px;height:46px}
.board-info h3{margin-bottom:7px;font-size:17px}
.board-meta{gap:12px}
.latest-topic{grid-column:auto;min-height:46px;padding:0 0 0 10px;border-top:0;border-left:1px solid var(--line)}
.login-card{padding:30px 24px}
.announcement-card{padding:18px}
.section-heading h2{font-size:21px}
}