@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Libre+Caslon+Display&display=swap');
:root{--bg:#f8f7f3;--paper:#fffefa;--ink:#263a32;--muted:#73796f;--green:#294d42;--line:#e4e5dc;--sage:#e9eee4;--serif:'Libre Caslon Display',Georgia,serif;--sans:'DM Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:14px;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{color:inherit}a{color:var(--green)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid #b46b3f;outline-offset:4px}button{border:0;background:none}button:disabled{cursor:default}svg{width:20px;height:20px;flex-shrink:0}.header{height:91px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 46px;background:var(--bg);position:sticky;top:0;z-index:5}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:var(--ink);font-size:21px;letter-spacing:-.5px;font-weight:600;line-height:1.2}.brand-icon{height:42px;width:42px;display:grid;place-items:center;background:var(--green);border-radius:12px;color:#ecefd7;font-size:36px;font-weight:400}.brand-sub{display:block;font-size:9px;font-weight:550;letter-spacing:2px;margin-top:6px;color:var(--muted)}.header-right{display:flex;align-items:center;gap:25px}.private-label{font-size:12px;color:var(--muted)}.icon-button{width:36px;height:36px;border:1px solid #d8dcd0;border-radius:50%;display:grid;place-items:center;font-family:Georgia,serif;font-size:17px}.app-shell{display:grid;grid-template-columns:259px minmax(0,1fr);max-width:1500px;margin:auto}.sidebar{border-right:1px solid var(--line);padding:40px 22px 24px;height:calc(100dvh - 91px);position:sticky;top:91px;display:flex;flex-direction:column;overflow:auto}.sidebar-label{font-size:10px;letter-spacing:1.8px;color:var(--muted);padding:0 15px;margin-bottom:20px;font-weight:550}.topic-link{width:100%;display:flex;align-items:center;text-align:left;gap:12px;min-height:47px;margin-bottom:5px;border-radius:7px;padding:9px 12px;font-size:12px;line-height:1.4;color:#636c62;transition:background .15s}.topic-link .topic-number{font-size:10px;letter-spacing:.5px;color:#8c9488;min-width:18px}.topic-link .topic-name{flex:1}.topic-link .topic-count{font-size:10px;font-weight:500}.topic-link:hover{background:#eff0e8}.topic-link.active{background:var(--sage);color:var(--green);font-weight:600}.topic-link.active .topic-number{color:var(--green)}.sidebar-bottom{margin-top:auto;padding:45px 14px 0}.progress-top{display:flex;justify-content:space-between;font-size:11px}.progress-top 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#dddfcf;border-radius:3px;background:#f0f0e5;top:13px;left:43px}.paper-back{transform:rotate(-12deg);background:#e3e8db}.paper-front{transform:rotate(8deg);padding:24px 17px;background:#f6f4e9;box-shadow:0 8px 20px #35492d09}.paper-title{font-family:var(--serif);font-size:21px;line-height:1.05;display:block}.paper-rule{height:1px;background:#cbd1bc;margin-top:16px}.paper-rule+.paper-rule{margin-top:10px}.paper-rule.short{width:70%}.paper-star{display:block;font-size:36px;line-height:1;color:#7c8c64;margin-top:8px}.paper-footer{position:absolute;bottom:13px;font-size:6px;letter-spacing:1.5px;color:#8b917d}.art-spark{position:absolute;top:0;right:0;color:#a2ae88;font-size:35px;transform:rotate(10deg)}.notes-section{padding-top:27px}.tools{display:flex;gap:12px}.search{background:var(--paper);border:1px solid #dcdfd3;border-radius:8px;display:flex;align-items:center;gap:12px;padding:0 15px;min-height:48px;flex:1;min-width:0;color:#858c7c}.search input{width:100%;min-width:0;border:0;background:transparent;outline:none;color:var(--ink);font-size:12px;height:46px}.search input:focus-visible{outline:none}.search:focus-within{outline:2px solid #8a9d7b;outline-offset:2px}.search input::placeholder{color:#93988d}.search kbd{font-size:10px;border:1px solid var(--line);border-radius:3px;padding:2px 5px;color:#9b9f93}.review-button{border:1px solid #dcdfd3;border-radius:8px;padding:0 15px;display:flex;align-items:center;gap:7px;font-size:11px;background:#f1f2e9;white-space:nowrap}.review-button svg{width:15px;height:15px}.review-button[aria-pressed=true]{background:var(--green);color:white}.list-bar{display:flex;align-items:center;justify-content:space-between;margin-top:25px;border-bottom:1px solid var(--line)}.view-tabs{display:flex;gap:25px}.view-tab{position:relative;padding:0 0 15px;font-size:12px;color:#858b7e;display:flex;gap:8px;align-items:center;min-height:35px}.view-tab span{font-size:9px;padding:3px 5px;border-radius:4px;background:#eceee5;color:#77816c}.view-tab.active{color:var(--green);font-weight:600}.view-tab.active:after{content:'';position:absolute;bottom:-1px;left:0;right:0;background:var(--green);height:2px}.view-tab.active span{background:#e1e8d8;color:var(--green)}.list-caption{font-size:10px;color:#969b8e;padding-bottom:15px}.results-line{display:flex;justify-content:space-between;align-items:center;padding:24px 0 16px;gap:10px}.results-line h2{font-family:var(--serif);font-weight:400;font-size:27px;margin:0;letter-spacing:-.3px}.results-line>span{font-size:10px;color:#858d7c;white-space:nowrap}.topic-section{margin-bottom:29px}.topic-heading{display:flex;align-items:center;gap:9px;margin:2px 0 12px}.topic-heading .topic-dot{width:6px;height:6px;border-radius:50%;background:var(--topic-color,#7a8f67)}.topic-heading h3{font-size:10px;font-weight:550;letter-spacing:1.2px;text-transform:uppercase;margin:0}.topic-heading .section-count{font-size:9px;color:#919789}.topic-heading:after{content:'';flex:1;height:1px;background:var(--line);margin-left:3px}.note-card{position:relative;background:var(--paper);border:1px solid #e2e5d9;border-radius:8px;margin-bottom:9px;padding:19px 19px 15px;transition:border-color .15s;scroll-margin-top:110px}.note-card:hover{border-color:#b7c4ac}.note-content{padding-right:32px}.note-card h4{font-size:14px;line-height:1.5;font-weight:600;margin:0 0 5px;letter-spacing:-.15px}.note-card .note-body{font-size:12px;line-height:1.85;color:#747c6b;margin:0;max-width:760px}.note-tip{font-size:10px;line-height:1.7;color:#6c7b5e;background:#f0f3e9;border-left:2px solid #acbd94;padding:5px 9px;margin:12px 0 0;display:inline-block;border-radius:0 3px 3px 0}.note-tip 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#cbd2bf;border-radius:8px;margin-bottom:25px}.empty-state>span{font-size:40px;color:#839670}.empty-state h3{font-family:var(--serif);font-size:30px;font-weight:400;margin:12px 0}.empty-state p{font-size:13px;color:var(--muted)}.empty-state button{padding:12px 19px;border-radius:6px;background:var(--green);color:white;margin-top:8px}.end-note{text-align:center;border-top:1px solid var(--line);padding:23px 0 28px}.end-note>span{font-size:26px;color:#93a77e}.end-note p{font-family:var(--serif);font-size:22px;margin:8px 0 14px}.end-note button{font-size:10px;color:var(--muted);padding:10px}footer{display:flex;align-items:center;flex-wrap:wrap;gap:13px;padding:20px 0 28px;border-top:1px solid var(--line);font-size:9px;color:#92998a}footer button{font-size:9px;color:#6c7b5e;padding:5px 0;margin-left:auto}#offline-status:empty{display:none}.mobile-topics{display:none}dialog{color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:14px;max-width:620px;width:calc(100% - 32px);max-height:85dvh;padding:26px;box-shadow:0 30px 100px #23392733}dialog::backdrop{background:#172d2266;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between}dialog h2{font-family:var(--serif);font-size:38px;line-height:1.1;font-weight:400;margin:20px 0}dialog h3{font-size:14px;margin-top:25px}dialog p,dialog li{font-size:13px;line-height:1.8;color:#727c68}dialog ul{padding-left:18px}dialog a{text-underline-offset:3px}dialog .exam-facts{display:flex;justify-content:space-around;gap:12px;background:var(--sage);border-radius:8px;padding:20px 10px;margin:20px 0}.exam-facts strong{display:block;font-family:var(--serif);font-size:33px;font-weight:400}.exam-facts span{font-size:10px;color:#6f7e60}.original-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.original-grid a{display:block;text-decoration:none}.original-grid img{width:100%;aspect-ratio:3/4;object-fit:cover;object-position:top;border:1px solid var(--line);border-radius:4px}.original-grid span{font-size:10px;color:var(--muted)}#toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,15px);background:var(--green);color:#fafbf5;padding:12px 20px;border-radius:8px;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;font-size:12px;z-index:20;max-width:90vw;box-shadow:0 5px 25px #1e382b20}#toast.show{opacity:1;transform:translate(-50%,0)}.skip-link{position:fixed;top:-100px;left:15px;background:var(--green);color:white;padding:12px;z-index:30}.skip-link:focus{top:10px}mark{background:#e6edb9;color:inherit;border-radius:2px}.noscript{padding:30px}.loading{color:var(--muted);padding:20px 0;font-size:13px}[hidden]{display:none!important}
@media(min-width:1400px){main{padding:0 76px}.intro{min-height:340px;padding-top:58px}.notebook-art{right:32px;top:70px}}@media(max-width:1180px){main{padding:0 36px}.app-shell{grid-template-columns:235px minmax(0,1fr)}.sidebar{padding-left:13px;padding-right:13px}.notebook-art{right:0;transform:scale(.85);transform-origin:right center}h1{font-size:51px}.intro-description{max-width:330px}.list-caption{display:none}}@media(max-width:960px){.notebook-art{display:none}.header{padding:0 28px}.app-shell{grid-template-columns:220px minmax(0,1fr)}main{padding:0 30px}.review-button{padding:0 11px;font-size:10px}.search{padding:0 11px;gap:8px}.search input{font-size:11px}.search kbd{display:none}.intro{min-height:300px}h1{font-size:49px}.intro-meta{gap:10px;font-size:9px}.intro-meta button{font-size:9px}.sidebar-label{padding-left:10px}.topic-link{padding-left:10px;gap:6px;font-size:11px}.private-label{font-size:11px}}@media(max-width:700px){html{scroll-padding-top:90px}.header{height:78px;padding:0 21px}.brand{font-size:19px;gap:10px}.brand-icon{width:36px;height:36px;font-size:31px;border-radius:10px}.brand-sub{font-size:8px;letter-spacing:1.65px}.private-label{display:none}.icon-button{width:32px;height:32px}.app-shell{display:block}.sidebar{display:none}main{padding:0 22px;max-width:620px;margin:0 auto}.intro{padding:33px 0 26px;min-height:auto}.eyebrow{font-size:8px;letter-spacing:1.7px}h1{font-size:49px;line-height:1.02;margin:19px 0 15px;letter-spacing:-.6px}.intro-description{font-size:12px;line-height:1.9;max-width:none}.mobile-break{display:block}.intro-meta{gap:12px;margin-top:18px;line-height:1.8;font-size:9px}.intro-meta button{flex-basis:100%;text-align:left;font-size:9px;margin-top:0}.notes-section{padding-top:21px}.tools{gap:8px;align-items:stretch}.search{min-height:47px;gap:8px;padding:0 11px}.search input{height:45px;font-size:12px}.search input::placeholder{font-size:10px}.search svg{width:17px;height:17px}.review-button{font-size:10px;padding:0 9px;gap:5px}.review-button svg{width:13px;height:13px}.mobile-topics{display:flex;align-items:center;gap:12px;margin-top:12px}.mobile-topics label{font-size:10px;color:var(--muted)}.mobile-topics select{width:100%;border:1px solid #dfe3d5;border-radius:6px;min-height:42px;padding:0 10px;color:var(--green);background:#f0f2e9;font-size:12px}.list-bar{margin-top:21px}.view-tabs{gap:25px}.view-tab{font-size:12px}.results-line{padding:21px 0 16px}.results-line h2{font-size:27px}.results-line>span{font-size:9px}.note-card{padding:16px 15px 11px;margin-bottom:10px}.note-content{padding-right:24px}.note-card h4{font-size:14px;line-height:1.5}.note-card .note-body{font-size:12px;line-height:1.85}.bookmark-button{right:6px;top:9px}.note-tip{font-size:10px;margin-top:10px}.note-bottom{margin-top:10px}.source-link{font-size:9px}.learn-button{font-size:10px;min-height:34px}.topic-heading h3{font-size:9px;letter-spacing:1px}.topic-section{margin-bottom:25px}.end-note p{font-size:22px}.end-note{padding-top:19px}footer{font-size:8px;line-height:1.7;gap:4px}footer button{font-size:8px;padding:10px 0}dialog{padding:20px}dialog h2{font-size:33px}.original-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:360px){main{padding:0 16px}.header{padding:0 16px}h1{font-size:43px}.search input::placeholder{font-size:9px}.review-button{font-size:9px;padding:0 7px;gap:3px}.review-button svg{display:none}.view-tabs{gap:20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}@media print{.header,.sidebar,.tools,.list-bar,.mobile-topics,.bookmark-button,.learn-button,.end-note,footer,.intro-meta button,.notebook-art{display:none}.app-shell{display:block}main{padding:0}.intro{padding-top:0}.note-card{break-inside:avoid}.note-body{color:#333!important}.intro{min-height:auto}body{background:white}.topic-section{margin-bottom:20px}.note-card{border:1px solid #ddd}.results-line{padding:16px 0}}
/* Comfortable reading sizes for quick revision. */
.note-card h4{font-size:16px}.note-card .note-body{font-size:14px;line-height:1.75;color:#65705d}.note-tip{font-size:11px}.source-link{font-size:10px}.learn-button{font-size:11px}.mobile-progress{display:none!important}@media(max-width:700px){.note-card h4{font-size:16px}.note-card .note-body{font-size:14px;line-height:1.8}.note-tip{font-size:11px}.learn-button{min-height:40px;font-size:11px}.bookmark-button{height:40px;width:40px;right:5px;top:7px}.note-content{padding-right:29px}.mobile-progress{display:flex!important;color:#627651}.source-link{font-size:10px}.intro-meta{column-gap:12px}}
@media(max-width:700px){.intro{padding-top:27px;padding-bottom:22px}h1{font-size:39px;line-height:1.05;margin-top:17px;margin-bottom:13px}.intro-meta{margin-top:14px}.mobile-break{display:none}.intro-description{max-width:340px}}@media(max-width:360px){h1{font-size:35px}}
/* Keep each Traditional Chinese translation immediately below its English text. */
[lang="zh-Hant"]{font-family:-apple-system,BlinkMacSystemFont,"PingFang TC","Microsoft JhengHei","Noto Sans CJK TC",sans-serif;letter-spacing:.02em}
.note-title-zh{display:block;margin-top:3px;color:#596b50;font-size:14px;font-weight:500;line-height:1.65}
.note-card .note-body-zh{margin-top:8px;color:#56664d;font-size:14px;line-height:1.85;overflow-wrap:anywhere}
.note-tip-zh{display:block;margin-top:5px;line-height:1.85}
.topic-title-zh{display:block;margin-top:4px;font-size:11px;line-height:1.6;font-weight:400;letter-spacing:.04em;text-transform:none;color:#687b59}
.sidebar-title-zh{display:block;font-size:10px;line-height:1.7;margin-top:2px;font-weight:400;color:#687b59}
@media(max-width:700px){.note-title-zh{font-size:14px}.note-card .note-body-zh{font-size:14px;line-height:1.9}.note-tip-zh{font-size:12px}.note-content{padding-right:0}.note-card h4{padding-right:28px}}
@media print{.note-title-zh,.note-card .note-body-zh{color:#333}}
/* Shared page navigation and the bilingual history timeline. */
.study-nav{display:flex;align-items:center;gap:10px}.study-nav a{display:block;padding:8px 14px;text-decoration:none;font-size:12px;color:#6e7a62;border-radius:6px;line-height:1.35;text-align:center}.study-nav a>span{display:block;font-size:10px;margin-top:2px}.study-nav a[aria-current=page]{background:var(--sage);color:var(--green);font-weight:600}.study-nav a:hover{background:#edf0e5}.header-right{gap:18px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.timeline-main{max-width:1080px;padding:0 48px;margin:0 auto}.timeline-intro{padding:45px 0 30px;border-bottom:1px solid var(--line)}.timeline-intro h1{margin:21px 0 12px}.timeline-intro-zh{font-size:24px;line-height:1.6;margin:0 0 16px;color:#637953}.timeline-subtitle-zh{font-size:13px;color:#68775e;line-height:1.9;margin:6px 0 0}.timeline-overview{display:flex;flex-wrap:wrap;gap:22px;color:#808975;font-size:11px;margin-top:23px}.timeline-overview>span{display:flex;align-items:baseline;gap:5px}.timeline-overview strong{font-weight:600;color:var(--green)}.timeline-overview span[lang]{font-size:10px}.timeline-controls{position:sticky;top:91px;z-index:3;background:var(--bg);display:flex;gap:10px;padding:20px 0 15px}.timeline-controls .search{min-width:0}.period-picker{display:block;max-width:292px;min-width:0;flex:0 1 292px}.period-picker select{height:48px;width:100%;border:1px solid #dce1d2;border-radius:8px;background:#f0f2e9;color:var(--green);font-size:11px;padding:0 30px 0 12px;text-overflow:ellipsis}.key-dates-button{display:flex;align-items:center;justify-content:center;gap:9px;padding:6px 15px;border:1px solid #dce1d2;border-radius:8px;background:#f1f2e9;font-size:11px;white-space:nowrap}.key-dates-button>span:first-child{font-size:24px;color:#80936b}.key-dates-button>span>span{display:block;margin-top:2px;font-size:10px}.key-dates-button[aria-pressed=true]{background:var(--green);color:#fff}.key-dates-button[aria-pressed=true]>span:first-child{color:#d5e1ba}.era-jumps{display:flex;gap:7px;flex-wrap:wrap;padding:0 0 18px;border-bottom:1px solid var(--line)}.era-jumps:empty{display:none}.era-jumps a{border:1px solid #e0e5d5;border-radius:6px;padding:8px 11px;text-decoration:none;font-size:10px;color:#768368;background:#f5f6ef;line-height:1.4}.era-jumps a>span{display:block;font-size:10px;margin-top:4px;color:#647855}.era-jumps a:hover{background:var(--sage);border-color:#b5c3a5}.timeline-results-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:21px 0 27px;min-height:28px}.timeline-results-bar p{font-size:11px;color:#7b8670;margin:0;line-height:1.7}.timeline-results-bar p>span{margin-left:10px;font-size:10px}.timeline-results-bar button{font-size:10px;color:#6b7f58;padding:7px 0 7px 7px}.timeline-results-bar button>span{margin-left:3px}.history-period{margin-bottom:36px;scroll-margin-top:173px}.history-period-heading{display:grid;grid-template-columns:124px minmax(0,1fr);column-gap:32px;align-items:center;margin-bottom:20px;padding-bottom:15px;border-bottom:1px solid #e0e5d5}.period-range{font-size:14px;font-weight:500;line-height:1.5;color:#6c805a}.period-range-zh{display:block;font-size:10px;line-height:1.7;color:#87947a;margin-top:3px}.history-period-heading h2{font-family:var(--serif);font-size:31px;font-weight:400;line-height:1.2;letter-spacing:-.2px;margin:0}.history-period-heading h2>span{display:block;margin-top:6px;font-size:14px;font-weight:400;line-height:1.8;color:#627655}.history-events{list-style:none;padding:0;margin:0}.history-event{display:grid;grid-template-columns:124px minmax(0,1fr);gap:32px;position:relative;padding-bottom:17px;scroll-margin-top:180px}.history-event:before{content:'';position:absolute;left:139px;top:0;bottom:0;border-left:1px solid #d7dfca}.history-event:after{content:'';position:absolute;left:135px;top:21px;width:7px;height:7px;background:#9aac85;border:2px solid var(--bg);box-sizing:content-box;border-radius:50%}.history-event:last-child{padding-bottom:0}.history-event:last-child:before{bottom:auto;height:24px}.history-date{padding-top:18px;text-align:right;font-size:15px;font-weight:600;color:#657b50;line-height:1.5}.history-date>span{display:block;overflow-wrap:anywhere}.history-date .history-date-zh{font-size:11px;color:#879575;font-weight:400;line-height:1.8;margin-top:3px}.history-date .key-label{display:inline-block;font-size:9px;font-weight:500;color:#9a714b;margin-top:8px;background:#f1eadd;padding:3px 7px;border-radius:4px}.key-label>span{margin-left:3px}.key-event:after{background:#a88757}.history-card{min-width:0;border:1px solid #e1e5d9;background:var(--paper);border-radius:8px;padding:20px 23px 15px;transition:border-color .15s}.history-card:hover{border-color:#bbc9ab}.history-card h3{font-size:16px;font-weight:600;line-height:1.5;margin:0 0 10px}.history-card p{font-size:14px;color:#65705d;line-height:1.8;margin:0}.history-card .history-body-zh{font-size:14px;color:#56664d;line-height:1.9;margin-top:8px}.history-links{display:flex;flex-wrap:wrap;gap:12px 18px;margin-top:16px;border-top:1px solid #eef0e7;padding-top:11px}.history-links a{font-size:10px;color:#859276;line-height:1.9;text-decoration:none}.history-links a:first-child{color:#5a7549}.history-links a:hover{text-decoration:underline;text-underline-offset:3px}.history-links a>span{margin-left:3px}.history-correction{font-size:11px;line-height:1.8;color:#94754c;background:#f5f0e4;border-left:2px solid #c2aa7d;padding:8px 10px;margin-top:13px}.history-correction>span{display:block;margin-top:3px}.history-correction strong{font-weight:600}.timeline-sources{border-top:1px solid var(--line);padding-top:27px;margin-top:25px}.timeline-sources h2{font-family:var(--serif);font-size:29px;line-height:1.2;font-weight:400;margin:0 0 18px}.timeline-sources h2>span{display:block;font-size:15px;line-height:1.9;color:#6b805c;margin-top:8px}.timeline-sources p{font-size:12px;line-height:1.9;color:#7b866e;margin:10px 0}.timeline-sources .history-photo-links{display:flex;flex-wrap:wrap;gap:10px 18px;margin:19px 0 22px}.history-photo-links a{font-size:11px;text-underline-offset:3px}.timeline-sources details{border:1px solid var(--line);background:#f4f5ed;border-radius:8px;padding:15px 18px;margin-bottom:30px}.timeline-sources summary{font-size:12px;line-height:1.8;cursor:pointer;color:#5c724d}.timeline-sources summary>span{margin-left:5px;font-size:11px}.timeline-sources ul{padding-left:18px}.timeline-sources li{font-size:11px;line-height:1.9;padding:4px 0}.timeline-sources li a{overflow-wrap:anywhere}.timeline-main footer>a{font-size:11px;text-decoration:none;line-height:1.8}.timeline-main footer>a>span{margin-left:5px}.note-card:focus{outline:2px solid #8b9e78;outline-offset:4px}
@media(max-width:960px){.timeline-main{padding:0 30px}.period-picker{flex-basis:230px;max-width:230px}.timeline-controls{gap:8px}.key-dates-button{padding:6px 11px}.history-period-heading,.history-event{grid-template-columns:108px minmax(0,1fr);gap:29px}.history-event:before{left:121px}.history-event:after{left:117px}.history-period-heading h2{font-size:29px}}
@media(max-width:700px){.header{padding-left:16px;padding-right:16px}.header .brand{font-size:16px;gap:8px}.header .brand-icon{width:32px;height:32px;font-size:28px}.header .brand-sub{font-size:6.5px;letter-spacing:1.1px}.header-right{gap:9px}.study-nav{gap:3px}.study-nav a{font-size:11px;padding:6px 8px}.study-nav a>span{font-size:9px}.timeline-main{padding:0 22px;max-width:620px}.timeline-intro{padding:28px 0 22px}.timeline-intro .eyebrow{font-size:7px;letter-spacing:1.1px}.timeline-intro h1{font-size:40px;margin:20px 0 9px}.timeline-intro-zh{font-size:20px;margin-bottom:13px}.timeline-intro .intro-description{font-size:12px}.timeline-subtitle-zh{font-size:12px}.timeline-overview{gap:8px 16px;font-size:10px;margin-top:17px}.timeline-overview span[lang]{font-size:9px}.timeline-controls{top:78px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:9px;padding-top:17px;padding-bottom:13px}.timeline-controls .search{grid-column:1/-1;min-height:46px}.timeline-controls .search input{font-size:12px}.timeline-controls .search input::placeholder{font-size:11px}.period-picker{max-width:none;min-width:0;width:100%}.period-picker select{height:46px;font-size:11px;padding-left:10px}.key-dates-button{min-height:46px;padding:5px 10px;gap:7px}.key-dates-button>span:first-child{font-size:21px}.key-dates-button>span>span{font-size:9px}.era-jumps{flex-wrap:nowrap;overflow-x:auto;padding-bottom:12px;scrollbar-width:thin}.era-jumps a{flex-shrink:0;font-size:9px;padding:7px 10px}.era-jumps a>span{font-size:10px}.timeline-results-bar{margin-top:17px;margin-bottom:20px;align-items:start}.timeline-results-bar p{font-size:10px}.timeline-results-bar p>span{display:block;margin-left:0;margin-top:2px;font-size:10px}.timeline-results-bar button{font-size:9px;white-space:nowrap}.timeline-results-bar button>span{display:none}.history-period{scroll-margin-top:220px;margin-bottom:27px}.history-period-heading{display:block;margin-bottom:19px;padding-bottom:15px}.history-period-heading>div{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap;margin-bottom:9px}.period-range{font-size:12px}.period-range-zh{font-size:10px;margin-top:0}.history-period-heading h2{font-size:28px;line-height:1.15}.history-period-heading h2>span{font-size:13px;margin-top:6px}.history-event{display:block;padding-left:21px;padding-bottom:19px;scroll-margin-top:220px}.history-event:before{left:3px}.history-event:after{left:-1px;top:7px}.history-date{padding:0 0 10px;text-align:left;font-size:16px;display:flex;align-items:baseline;flex-wrap:wrap;gap:3px 10px}.history-date .history-date-zh{font-size:11px;margin-top:0}.history-date .key-label{font-size:8px;margin-top:0;padding:2px 6px}.history-card{padding:16px 15px 12px}.history-card h3{font-size:16px;margin-bottom:10px}.history-card .history-body-zh{font-size:14px;line-height:1.9}.history-links{gap:7px 13px;margin-top:13px;padding-top:10px}.history-links a{font-size:10px}.history-links a>span{font-size:9px;margin-left:2px}.history-correction{font-size:11px}.timeline-sources{padding-top:22px}.timeline-sources h2{font-size:26px}.timeline-sources h2>span{font-size:14px}.timeline-sources p{font-size:12px}.history-photo-links a{font-size:11px}.timeline-sources details{padding:12px}.timeline-sources summary>span{display:block;margin-left:16px;font-size:11px}.timeline-main footer>a{font-size:10px}}
@media(max-width:360px){.header{padding-left:12px;padding-right:12px}.header .brand{font-size:15px}.header .brand-icon{width:29px;height:29px;font-size:25px}.header .brand-sub{font-size:6px;letter-spacing:1px}.header-right{gap:5px}.study-nav a{padding:6px;font-size:10px}.study-nav a>span{font-size:9px}.header .icon-button{width:28px;height:28px}.timeline-main{padding:0 16px}.timeline-intro h1{font-size:37px}.timeline-overview{gap:8px 12px}.timeline-overview span[lang]{font-size:8px}.history-card{padding:14px 12px 11px}.history-links a>span{display:none}.history-period-heading h2{font-size:26px}}
@media print{.study-nav,.timeline-controls,.era-jumps,.timeline-results-bar,.history-links,.timeline-sources,footer{display:none}.timeline-main{max-width:none;padding:0}.timeline-intro{padding-top:0}.history-event{break-inside:avoid}.history-period{break-inside:auto}.history-card{background:white}.history-card p,.history-card .history-body-zh{color:#333}}