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span:before{content:'';display:inline-block;width:9px;height:9px;border-radius:3px;margin-right:5px;background:#ffe7a1}.legend span:nth-child(2):before{background:#d9eafa}.legend span:nth-child(3):before{background:#f9d9d8}.evidence-switch{font-size:13px;padding:7px 12px;color:var(--blue-dark);border-color:#c9dcee}.walkthrough{background:#fffcf6;border:1px solid #ede5d7;border-radius:18px;padding:21px}.walkthrough h3{margin-bottom:3px}.step-count{font-size:12px;color:#8b8173}.reveal-step{padding:14px 0;border-bottom:1px dashed #e4ddd1}.reveal-step b{font-size:14px;color:#665743}.reveal-step p{font-size:14px;margin:7px 0 0}.step-locked{padding:14px 0;font-size:14px;color:#8a8b8f}.step-controls{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}.primary,button.primary{display:inline-block;border:1px solid #397aca;background:#3d7fcc;color:white;border-radius:12px;padding:10px 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p{font-size:13px;color:#757a81;margin:0}.exam-table{width:100%;border-collapse:collapse;font-size:14px;background:white;margin:14px 0}.exam-table th,.exam-table td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.exam-table th{background:#eff5fc;color:#456888;font-weight:600}.exam-table td small{display:block;font-size:12px}.split{display:grid;grid-template-columns:1fr 1fr;gap:20px}.pair-row{display:grid;grid-template-columns:110px 1fr 1fr;gap:14px;padding:15px 0;border-bottom:1px solid var(--line);align-items:start;font-size:14px}.pair-row .english{font-size:1rem}.pair-row b{color:#587599}.signal-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.signal-row>div{background:#f2f6fa;padding:15px;border-radius:12px;font-size:13px}.signal-row b{display:block;font-size:15px}.essay-part{margin:13px 0;padding:15px 18px;border-left:3px solid #a6c4e7;background:#f4f8fd}.essay-part:nth-child(even){background:#fff5f1;border-color:#eac5bd}.essay-part .english{font-size:1.05rem;margin-bottom:6px}.essay-part small{font-size:12px}.draft-area{width:100%;min-height:155px;resize:vertical;border:1px solid #cddae8;border-radius:12px;padding:14px;background:#fffefb;font-family:Georgia,"Microsoft YaHei",serif;line-height:1.9}.vocab-controls{display:flex;gap:12px;margin:20px 0;flex-wrap:wrap}.vocab-controls input{flex:1;min-width:180px}.vocab-controls input,.vocab-controls select{padding:10px 15px;border-radius:12px;border:1px solid #dce2e9;background:white}.vocab-list{border-top:1px solid var(--line)}.vocab-row{display:grid;grid-template-columns:1.1fr 1.3fr 90px;gap:20px;border-bottom:1px solid var(--line);padding:16px 8px;align-items:start;font-size:14px}.vocab-row .word{font-family:Georgia,serif;font-size:19px}.vocab-row small{display:block;font-size:12px}.vocab-row details{font-size:12px}.source-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.source-page{background:white;border:1px solid var(--line);border-radius:12px;padding:17px;font-size:13px}.source-page h3{font-size:14px}.source-page p{font-size:12px;color:#7b7e83}.uncertainty{padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}.uncertainty p{margin:5px 0;font-size:13px}.storage-note{font-size:12px;margin-top:10px;color:#848890}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#35475b;color:white;border-radius:12px;padding:12px 22px;z-index:50;font-size:14px;display:none;max-width:90vw}dialog{max-width:520px;width:calc(100% - 34px);border:1px solid #e4ded7;border-radius:22px;padding:30px;box-shadow:0 20px 80px #232e3b30}dialog::backdrop{background:#333e5055}.close-dialog{float:right;border:0;padding:0 5px;font-size:25px}.export-options{display:grid;gap:16px;margin:24px 0}.export-options>a{text-align:center}dialog p{font-size:14px}.skip-link{position:fixed;top:-80px;left:20px;z-index:99;background:white;padding:10px}.skip-link:focus{top:8px}[hidden]{display:none!important}#print-root{display:none}.book-toolbar{padding:15px 25px;display:flex;gap:18px;align-items:center;justify-content:center;background:white;position:sticky;top:0;z-index:20;font-size:14px}.book-body{background:#eeeae4}.book-body #print-root{display:block}.empty{padding:25px;text-align:center;color:#7a7f86}.print-answer{display:none}.no-wrap{white-space:nowrap}
@media(min-width:1500px){main{padding-top:34px}.example-body{padding:25px 28px}.chapter-hero img{width:170px;height:170px}}
@media(max-width:1100px){.topbar{gap:15px;padding:10px 20px}.top-links{gap:18px}.app-layout{grid-template-columns:215px minmax(0,1fr)}.brand{width:180px}.sidebar{padding:22px 12px}.example-layout{grid-template-columns:1fr}.method-intro{gap:14px}.flow{gap:12px}.flow-item{padding:14px 11px}.chapter-hero img{width:120px;height:135px}.top-links a{font-size:13px}.header-actions{gap:10px}}
@media(max-width:760px){.topbar{height:auto;min-height:79px;padding:12px 17px;flex-wrap:wrap;gap:9px}.brand{width:auto;flex:1}.brand strong{font-size:31px}.brand small{font-size:9px}.top-links{display:none}.header-actions{gap:8px}.level-toggle button{padding:5px 8px;font-size:12px}.pdf-button{padding:8px 10px;font-size:12px}.app-layout{display:block}.sidebar{position:static;height:auto;border:0;padding:9px 13px 0;background:#fffcf7}.side-heading,.side-progress,.side-note,.source-link{display:none}#chapter-nav{display:flex;overflow:auto;gap:6px;padding-bottom:10px;scrollbar-width:thin}nav a{flex-shrink:0;font-size:13px;padding:7px 11px;margin:0;background:#f0f2f5}.nav-number{font-size:13px}.nav-check{margin-left:0}.nav-number{display:none}main{padding:16px 18px 45px}.breadcrumb{font-size:11px;margin-bottom:15px}.chapter-hero{gap:9px;min-height:110px;margin-bottom:20px}.chapter-hero img{width:83px;height:104px}.chapter-hero h1{font-size:1.55rem;letter-spacing:0}.chapter-hero p{font-size:13px}.eyebrow{font-size:9px}.tags{gap:4px}.tag{font-size:10px;padding:2px 6px}.chapter-tabs{gap:20px}.duration{display:none}.method-intro,.split{grid-template-columns:1fr;gap:13px}.panel{padding:19px}.panel p{font-size:14px}.flow{grid-template-columns:1fr 1fr;gap:12px}.flow-item:nth-child(2):after{display:none}.flow-item b{font-size:14px}.flow-item small{font-size:12px}.flow-index{font-size:18px}.example-body{padding:18px}.example-head{padding:11px 16px;font-size:13px}.english{font-size:1.07rem}.tip{padding:14px;align-items:flex-start;gap:8px;flex-direction:column}.tip strong{font-size:12px}.completion{align-items:stretch;flex-direction:column}.completion-nav{justify-content:space-between}.path-list{grid-template-columns:1fr 1fr;gap:11px}.path-item{padding:15px}.path-item h3{font-size:15px}.intro-banner{padding:21px;gap:0;position:relative;overflow:hidden}.intro-banner img{width:90px;height:125px;align-self:flex-end}.intro-banner h1{font-size:1.45rem}.intro-banner p{font-size:13px}.intro-banner .primary{padding:9px 14px;font-size:12px}.exam-table{font-size:12px}.exam-table th,.exam-table td{padding:9px 7px}.pair-row{grid-template-columns:1fr 1fr}.pair-row>b{grid-column:1/-1}.signal-row{grid-template-columns:1fr}.source-grid{grid-template-columns:1fr 1fr}.vocab-row{grid-template-columns:1fr 1fr;gap:10px}.vocab-row>a{grid-column:1/-1;font-size:12px}.vocab-row .word{font-size:17px}.book-toolbar{flex-wrap:wrap;padding:12px;gap:10px}.source-page{padding:13px}.section-title h2{font-size:1.17rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* 原稿优先：口诀、原步骤、解释保持各自身份。 */
.original-method{margin:24px 0;padding:26px;border:1px solid #c6d7db;border-radius:18px;background:#f7fbfa;overflow-wrap:anywhere}
.original-method h2{line-height:1.5}.original-method h3{margin:22px 0 12px}.original-method h3 small{font-size:12px;font-weight:400;color:#637478}
.original-quotes{padding:2px 18px 12px;background:#fff;border-radius:12px}
.original-quotes blockquote{margin:12px 0;padding:8px 14px;border-left:3px solid #459c98;font-weight:600;line-height:1.9;white-space:pre-line}
.original-chain{padding-left:25px}.original-chain li{padding:7px 0}.original-chain p,.original-logic p{margin:6px 0;line-height:1.85}
.original-logic{margin:12px 0;padding:12px 16px;background:#eef2fa;border-radius:9px}
.original-uncertain{font-size:13px;line-height:1.8;color:#655c55}.original-links{font-size:14px}
.original-page{margin:28px 0;scroll-margin-top:95px}.original-page img{width:100%;height:auto;border:1px solid #dde2e3;background:white}
.original-page-nav{display:flex;flex-wrap:wrap;gap:12px}.original-page-nav a{padding:7px}
@media(max-width:600px){.original-method{padding:16px}.original-quotes{padding:2px 10px 10px}.original-quotes blockquote{padding:6px 9px}}

/* 账户、同步与掌握状态 */
#sync-status{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);white-space:nowrap}#sync-status i{width:8px;height:8px;border-radius:50%;background:#5aaa68}#sync-status[data-state=saving] i{background:#dfa33c;animation:pulse 1s infinite}#sync-status[data-state=error] i{background:#d64b4b}#sync-status[data-state=saving] span{font-size:0}#sync-status[data-state=saving] span:after{content:'保存中'}#sync-status[data-state=error] span{font-size:0}#sync-status[data-state=error] span:after{content:'保存失败'}
.user-chip{display:flex;align-items:center;gap:8px;padding:5px 11px 5px 5px;border-radius:30px;background:#fff6f3}.user-chip img{width:38px;height:38px;border-radius:50%;object-fit:cover;background:var(--sky)}.user-chip span{display:grid;text-align:left;line-height:1.2}.user-chip small{font-size:10px}.login-button{color:var(--blue-dark);font-weight:700}.account-dialog{width:min(440px,calc(100vw - 28px));border:0;border-radius:24px;padding:32px;text-align:center;box-shadow:0 20px 70px #17212b44}.account-dialog::backdrop{background:#26344277;backdrop-filter:blur(3px)}.account-dialog .close-dialog{position:absolute;right:14px;top:14px}.login-avatar{width:125px;height:125px;object-fit:contain}.form-error{min-height:1.4em;color:#b33939;margin:0}.mastery-card{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:28px 0;padding:22px;background:linear-gradient(135deg,#fdf5f3,#f2f8ff);border:1px solid #e5dfe0;border-radius:18px}.mastery-card h3{margin-bottom:3px}.mastery-options{display:flex;gap:8px;flex-wrap:wrap}.mastery-options button[aria-pressed=true]{border-color:#4c83c3;background:#e3effc;color:#1f5795;font-weight:700}.site-footer{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;padding:22px;background:#f4f4f1;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.confetti-layer{position:fixed;inset:0;z-index:1000;pointer-events:none;overflow:hidden}.confetti-layer i{position:absolute;left:calc(var(--x)*1%);top:-20px;width:10px;height:18px;background:hsl(calc(var(--i)*47deg) 75% 65%);animation:confetti 2.8s var(--d) cubic-bezier(.15,.75,.35,1) forwards;transform:rotate(calc(var(--i)*21deg))}.welcome-bubble{position:absolute;left:50%;top:20%;transform:translate(-50%,-50%);background:white;border:3px solid #f2b6b0;border-radius:24px;padding:18px 28px;text-align:center;font-size:1.7rem;font-weight:800;box-shadow:0 15px 55px #18283935;animation:welcome 3.3s forwards}.welcome-bubble small{display:block;margin-top:5px;font-weight:400}@keyframes confetti{to{top:110%;transform:translateX(calc((var(--i) - 20)*1px)) rotate(900deg)}}@keyframes welcome{0%{opacity:0;transform:translate(-50%,-60%) scale(.8)}12%,78%{opacity:1;transform:translate(-50%,-50%) scale(1)}100%{opacity:0;transform:translate(-50%,-45%) scale(.96)}}@keyframes pulse{50%{opacity:.35}}

/* Apple Pencil / 手写标注层 */
#main{position:relative}#ink-canvas{position:absolute;left:0;top:0;z-index:8;pointer-events:none;touch-action:auto}#ink-canvas[data-active=true]{pointer-events:auto;touch-action:none;cursor:crosshair}#ink-toolbar{position:fixed;right:14px;top:112px;z-index:30;width:190px;padding:8px;background:#fffffff2;border:1px solid #d9dee6;border-radius:17px;box-shadow:0 12px 38px #1f304025;backdrop-filter:blur(12px)}#ink-toolbar[data-dock=left]{right:auto;left:14px}#ink-toolbar[data-dock=top]{top:98px;right:50%;width:min(680px,calc(100vw - 24px));transform:translateX(50%)}.ink-handle{width:100%;display:flex;justify-content:space-between;border:0;background:#f3f6fa;font-weight:700}.ink-controls{display:grid;gap:9px;padding-top:8px}.collapsed .ink-controls{display:none}.ink-tools,.ink-actions,.ink-colors{display:flex;gap:5px;flex-wrap:wrap}.ink-tools button,.ink-actions button{padding:6px 8px;font-size:12px}.ink-tools button[aria-pressed=true]{background:#e3effc;border-color:#5792d4}.ink-colors button{width:25px;height:25px;padding:0;border-radius:50%;background:var(--ink);border:3px solid white;box-shadow:0 0 0 1px #bbc4ce}.ink-colors button.selected{box-shadow:0 0 0 3px #6f92bc}.ink-controls label{display:flex;gap:8px;align-items:center;font-size:12px}.ink-controls input{min-width:0;flex:1}.ink-status{font-size:11px}.ink-status[data-state=error]{color:#ba3636}
@media(max-width:900px){.topbar{gap:10px;padding:8px 12px}.top-links{display:none}.header-actions{gap:7px}#sync-status span{display:none}.pdf-button span{display:none}.user-chip span{display:none}.user-chip{padding:4px}.brand{width:auto}.brand strong{font-size:29px}.mastery-card{align-items:flex-start;flex-direction:column}#ink-toolbar{top:auto;bottom:16px;right:10px}.site-footer{padding-bottom:85px}}

/* 蓉宝一键进入与真实学习日历 */
html[data-authenticated=false] .topbar,html[data-authenticated=false] .app-layout,html[data-authenticated=false] .site-footer,html[data-authenticated=false] #ink-toolbar,html[data-authenticated=false] .skip-link{display:none!important}
.login-gate{position:fixed;inset:0;z-index:1200;display:grid;place-items:center;overflow:auto;padding:24px;background:radial-gradient(circle at 20% 10%,#e8f3ff 0,transparent 34%),radial-gradient(circle at 90% 85%,#ffe7e2 0,transparent 37%),#fffaf5}.login-gate[hidden]{display:none}.gate-card{width:min(520px,100%);padding:32px clamp(24px,6vw,56px);text-align:center;background:#ffffffd9;border:1px solid #efe3dc;border-radius:34px;box-shadow:0 24px 80px #6d574726;backdrop-filter:blur(10px)}.gate-card img{display:block;width:min(260px,70vw);height:min(260px,70vw);object-fit:contain;margin:-12px auto 3px}.gate-card h1{font-size:clamp(2.1rem,7vw,3.4rem);margin-bottom:7px}.gate-card>p:not(.eyebrow):not(.form-error){color:#6d6864}.gate-button{min-width:220px;margin-top:8px;padding:13px 24px!important;font-size:16px!important}.user-chip{padding:3px;border-color:#e4d6d0;background:#fff8f4;box-shadow:0 3px 12px #6c4c3a18}.user-chip img{width:44px;height:44px;object-fit:cover;object-position:center 23%;background:#eaf3ff}.welcome-bubble{display:flex;align-items:center;gap:12px;min-width:min(390px,calc(100vw - 28px));text-align:left}.welcome-bubble img{width:72px;height:72px;object-fit:contain}.welcome-bubble span{display:block}.welcome-bubble small{font-size:.82rem}.study-calendar-card{margin:0 0 30px;padding:25px 28px;border:1px solid #dfe8e1;border-radius:22px;background:linear-gradient(135deg,#f8fbf6,#fff8f4);box-shadow:0 8px 30px #3851380c}.calendar-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:18px}.calendar-heading h2,.calendar-heading p{margin-bottom:0}.calendar-nav{display:flex;align-items:center;gap:8px}.calendar-nav button{width:38px;height:38px;padding:0}.calendar-nav strong{min-width:112px;text-align:center;font-size:14px}.study-calendar{display:grid;grid-template-columns:repeat(7,minmax(38px,1fr));gap:8px}.calendar-week{text-align:center;font-size:12px;color:#8a8e91}.calendar-day{position:relative;display:flex;align-items:center;justify-content:center;min-height:52px;border:1px solid #e3e6e1;border-radius:12px;background:#fff;color:#6e7475}.calendar-day b{font-size:13px}.calendar-day i{position:absolute;right:6px;bottom:3px;color:#4c8b62;font-size:12px;font-style:normal}.calendar-day.studied{border-color:#a9cbb1;background:#eaf5e9;color:#315c3d}.calendar-day.today{box-shadow:inset 0 0 0 2px #e4a8a0}.calendar-day.empty{border-color:transparent;background:transparent}.calendar-loading{grid-column:1/-1;margin:12px;text-align:center;color:var(--muted)}.calendar-loading.error{color:#b33939}
@media(max-width:600px){.gate-card{padding:24px 20px}.gate-card img{width:210px;height:210px}.calendar-heading{align-items:flex-start;flex-direction:column}.study-calendar-card{padding:20px 14px}.study-calendar{gap:5px}.calendar-day{min-height:43px;border-radius:9px}.welcome-bubble{top:18%;padding:12px 15px;font-size:1.25rem}.welcome-bubble img{width:58px;height:58px}}