.auth-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60;display:flex;align-items:center;justify-content:center;padding:24px;background:color-mix(in srgb,var(--sumi) 42%,transparent);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.auth-card{position:relative;width:min(420px,92vw);padding:28px 26px 24px;background:var(--paper-bright);background-image:var(--paper-grain);border:1px solid var(--line-strong);border-radius:var(--radius);box-shadow:var(--shadow-lift)}.auth-close{position:absolute;top:8px;right:12px;border:0;background:transparent;color:var(--faint);font-size:22px;line-height:1;cursor:pointer}.auth-close:hover{color:var(--ink)}.auth-tabs{display:flex;gap:18px;margin-bottom:18px;border-bottom:1px solid var(--line)}.auth-tab{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;background:transparent;padding:8px 2px 10px;cursor:pointer;font-family:var(--font-display);font-size:17px;color:var(--faint);border-bottom:2px solid transparent;margin-bottom:-1px}.auth-tab.is-active{color:var(--ink-deep);border-bottom-color:var(--seal)}.auth-title{font-family:var(--font-display);font-size:19px;color:var(--ink-deep);margin:0 0 4px}.auth-sub{color:var(--muted);font-size:13px;margin:0 0 16px;line-height:1.5}.auth-field{display:block;margin-bottom:14px}.auth-field>span{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.auth-input{width:100%;box-sizing:border-box;padding:10px 12px;font-size:15px;font-family:var(--font-body);color:var(--text);background:var(--paper);border:1px solid var(--line-strong);border-radius:var(--radius)}.auth-input:focus{outline:none;border-color:var(--seal);box-shadow:0 0 0 3px var(--accent-soft)}.auth-submit{width:100%;margin-top:6px;padding:11px 14px;font-family:var(--font-display);font-size:16px;color:var(--paper-bright);background:linear-gradient(135deg,var(--brand-from),var(--brand-to));border:0;border-radius:var(--radius);cursor:pointer}.auth-submit:disabled{opacity:.6;cursor:default}.auth-error{color:var(--seal);font-size:13px;margin:4px 0 10px}.auth-info{color:var(--slate);font-size:13px;margin:4px 0 10px;line-height:1.55}.auth-foot{margin-top:14px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;align-items:center}.auth-link{color:var(--seal);cursor:pointer;border:0;background:transparent;padding:0;font-size:13px}.auth-link:hover{text-decoration:underline}.auth-trigger{margin-left:auto;-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--line-strong);background:var(--paper);color:var(--ink-deep);font-family:var(--font-display);font-size:14px;padding:7px 14px;border-radius:var(--radius);cursor:pointer}.auth-trigger:hover{border-color:var(--seal);color:var(--seal)}.usermenu{margin-left:auto;position:relative}.usermenu-trigger{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid transparent;background:transparent;color:var(--ink-deep);font-family:var(--font-display);font-size:14px;padding:7px 10px;border-radius:var(--radius);cursor:pointer;display:inline-flex;align-items:center;gap:4px}.usermenu-trigger:hover{background:var(--warm-soft)}.usermenu-caret{font-size:11px;color:var(--faint)}.usermenu-pop{position:absolute;right:0;top:calc(100% + 8px);width:240px;background:var(--paper-bright);background-image:var(--paper-grain);border:1px solid var(--line-strong);border-radius:var(--radius);box-shadow:var(--shadow-lift);padding:10px;z-index:70}.usermenu-row{font-size:13px;color:var(--muted);padding:6px 8px;line-height:1.5}.usermenu-id{color:var(--faint);border-bottom:1px solid var(--line);margin-bottom:4px}.usermenu-action{width:100%;margin-top:6px;padding:8px;border:1px solid var(--line-strong);background:var(--paper);color:var(--seal);font-size:13px;border-radius:var(--radius);cursor:pointer}.usermenu-action:hover{background:var(--accent-soft)}:root{--ink: #33333a;--ochre: #b9824f;--slate: #7c8a8d;--rice: #ede4d3;--vermilion: #a8322a;--xuan: #f2ebdd;--ink-deep: #1a1c21;--ink-wash: color-mix(in srgb, var(--ink) 55%, var(--slate));--sumi: #12141a;--paper: #f6f2e9;--paper-deep: #e8e0d0;--paper-bright: #fbf8f1;--cover: #2a2a30;--cover-deep: #14161c;--cover-edge: color-mix(in srgb, var(--ink) 82%, var(--ochre) 18%);--seal: var(--vermilion);--brand-from: color-mix(in srgb, var(--ink-deep) 72%, var(--vermilion));--brand-mid: var(--vermilion);--brand-to: color-mix(in srgb, var(--vermilion) 78%, var(--ochre));--text: var(--ink-deep);--muted: color-mix(in srgb, var(--ink) 68%, var(--slate) 32%);--faint: color-mix(in srgb, var(--ink) 40%, var(--slate) 60%);--line: color-mix(in srgb, var(--ink) 12%, transparent);--line-strong: color-mix(in srgb, var(--ink) 26%, transparent);--accent: var(--vermilion);--accent-soft: color-mix(in srgb, var(--vermilion) 12%, var(--paper));--warm-soft: color-mix(in srgb, var(--ochre) 14%, var(--paper));--mist: color-mix(in srgb, var(--slate) 20%, var(--xuan) 80%);--font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;--font-body: "Noto Serif SC", "Songti SC", serif;--radius: 2px;--paper-grain: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");--ink-bloom: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='b'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.012' numOctaves='4' seed='7' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.12  0 0 0 0 0.13  0 0 0 0 0.16  0 0 0 0.55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23b)'/%3E%3C/svg%3E");--shadow-soft: 0 1px 0 rgba(255, 253, 248, .65) inset, 0 10px 28px color-mix(in srgb, var(--ink) 8%, transparent), 0 2px 6px color-mix(in srgb, var(--ink) 5%, transparent);--shadow-lift: 0 1px 0 rgba(255, 253, 248, .75) inset, 0 18px 42px color-mix(in srgb, var(--ink) 12%, transparent), 0 6px 14px color-mix(in srgb, var(--ink) 7%, transparent);--shadow-book: 0 22px 48px color-mix(in srgb, var(--ink) 30%, transparent), 0 8px 18px color-mix(in srgb, var(--ink) 14%, transparent);--shadow-well: inset 0 2px 8px color-mix(in srgb, var(--ink) 9%, transparent), inset 0 0 0 1px var(--line);--shadow-chip: 0 1px 0 rgba(255, 255, 255, .45) inset, 0 2px 4px color-mix(in srgb, var(--ink) 8%, transparent)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{font-family:var(--font-body);color:var(--text);overflow-x:clip;background:var(--paper-grain),radial-gradient(720px 480px at 6% 8%,color-mix(in srgb,var(--ink) 14%,transparent),transparent 62%),radial-gradient(640px 420px at 92% 12%,color-mix(in srgb,var(--slate) 16%,transparent),transparent 58%),radial-gradient(520px 360px at 78% 88%,color-mix(in srgb,var(--vermilion) 8%,transparent),transparent 55%),radial-gradient(ellipse 120% 55% at 50% 110%,color-mix(in srgb,var(--ink) 9%,transparent),transparent 58%),linear-gradient(175deg,var(--paper-bright) 0%,var(--xuan) 52%,var(--rice) 100%);background-attachment:fixed}button,input,select{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;min-height:100dvh;display:grid;grid-template-rows:auto 1fr;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}.topbar{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding:1.25rem 1.5rem .75rem}.brand-mark{position:relative;display:inline-block}.brand-word{display:block;font-family:var(--font-display);font-size:clamp(1.65rem,3vw,2.25rem);letter-spacing:.05em;line-height:1.05;background:linear-gradient(105deg,var(--brand-from) 0%,var(--brand-mid) 48%,var(--brand-to) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 1px 0 color-mix(in srgb,var(--ink) 12%,transparent))}.brand-tag{display:block;margin-top:.28rem;font-family:var(--font-body);font-size:.82rem;color:var(--ink-wash);letter-spacing:.22em}.brand-seal{position:absolute;top:.15rem;right:-2.6rem;width:2.05rem;height:2.05rem;display:grid;place-items:center;font-family:var(--font-display);font-size:1.05rem;color:var(--seal);border:1.5px solid color-mix(in srgb,var(--seal) 75%,transparent);border-radius:2px;background:color-mix(in srgb,var(--seal) 8%,transparent);transform:rotate(8deg);letter-spacing:0;opacity:.88;pointer-events:none}.source-badge{font-size:.75rem;color:var(--muted);border-bottom:1px solid color-mix(in srgb,var(--ink) 22%,transparent);padding-bottom:.15rem;letter-spacing:.06em}.app-shell.is-reading .topbar{background:linear-gradient(180deg,color-mix(in srgb,var(--xuan) 88%,transparent),transparent)}.stage{padding:.5rem 1.5rem 2rem;max-width:1100px;width:100%;margin:0 auto}.app-shell.is-brief{background:var(--sumi)}.app-shell.is-brief .stage-brief{max-width:none;padding:0;margin:0}.app-shell.is-reading .stage{max-width:1120px}.book-scene{--book-rx: 10deg;--book-ry: -5deg;position:relative;perspective:1500px;perspective-origin:50% 38%;padding:.85rem .65rem 2rem;animation:book-in .65s cubic-bezier(.22,1,.36,1) both}.book-desk-glow{position:absolute;left:8%;right:6%;bottom:.15rem;height:2.6rem;background:radial-gradient(ellipse 72% 70% at 48% 40%,color-mix(in srgb,var(--ink) 36%,transparent),color-mix(in srgb,var(--ink) 12%,transparent) 55%,transparent 72%);filter:blur(7px);pointer-events:none;z-index:0}@keyframes book-in{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.book-volume{--edge: 14px;--foot: 12px;position:relative;z-index:1;transform-style:preserve-3d;transform:rotateX(var(--book-rx)) rotateY(var(--book-ry));border-radius:1.1rem 1.55rem 1.35rem .95rem;box-shadow:none}.book-board{position:absolute;top:-8px;right:-12px;bottom:-12px;left:-10px;z-index:0;pointer-events:none;border-radius:1.35rem 1.85rem 1.6rem 1.15rem;background:radial-gradient(ellipse 55% 38% at 18% 12%,color-mix(in srgb,var(--slate) 28%,transparent),transparent 55%),radial-gradient(ellipse 48% 42% at 82% 84%,color-mix(in srgb,var(--ink) 35%,transparent),transparent 60%),linear-gradient(155deg,var(--cover) 0%,var(--ink) 42%,var(--cover-deep) 100%);box-shadow:inset 0 1px color-mix(in srgb,var(--rice) 22%,transparent),inset 0 0 0 1px color-mix(in srgb,var(--slate) 35%,transparent),0 28px 50px color-mix(in srgb,var(--ink) 34%,transparent),0 10px 18px color-mix(in srgb,var(--ink) 20%,transparent);transform:translateZ(-16px)}.book-edge-left,.book-edge-right{position:absolute;top:10px;bottom:calc(var(--foot) + 4px);width:var(--edge);z-index:3;pointer-events:none;background:linear-gradient(180deg,color-mix(in srgb,var(--paper-bright) 55%,transparent),transparent 30%,transparent 70%,color-mix(in srgb,var(--ink) 12%,transparent)),linear-gradient(90deg,var(--paper-bright),var(--rice) 28%,var(--paper-deep) 55%,color-mix(in srgb,var(--ochre) 28%,var(--rice)) 78%,color-mix(in srgb,var(--ochre) 40%,var(--slate)))}.book-edge-left{left:-3px;border-radius:1rem .2rem .35rem 1.1rem/1.4rem .3rem .4rem 1.5rem;box-shadow:inset -2px 0 5px #ffffff59,-4px 2px 12px #1c16122e;transform:translateZ(2px)}.book-edge-right{right:-4px;border-radius:.25rem 1.2rem 1.35rem .3rem/.35rem 1.5rem 1.7rem .4rem;box-shadow:inset 2px 0 5px #ffffff4d,5px 3px 14px #1c161233;transform:translateZ(4px) rotateY(6deg);transform-origin:left center}.book-edge-foot{position:absolute;left:8px;right:10px;bottom:-4px;height:var(--foot);z-index:3;pointer-events:none;border-radius:40% 45% 55% 50%/30% 35% 70% 65%;background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--paper-bright) 45%,transparent) 40%,transparent),linear-gradient(180deg,var(--rice),var(--paper-deep) 40%,color-mix(in srgb,var(--ochre) 22%,var(--rice)) 75%,color-mix(in srgb,var(--slate) 35%,var(--rice)));box-shadow:0 8px 16px color-mix(in srgb,var(--ink) 20%,transparent);transform:translateZ(-2px) rotateX(48deg);transform-origin:top center}.book-folio-crease{position:absolute;top:12px;bottom:calc(var(--foot) + 6px);left:50%;width:28px;margin-left:-14px;z-index:4;pointer-events:none;border-radius:40%;background:radial-gradient(ellipse 80% 50% at 50% 20%,rgba(255,252,246,.35),transparent 55%),linear-gradient(90deg,#33333a1f,#33333a0a 38%,#fffcf680,#33333a0a 62%,#33333a1f);filter:blur(.2px)}.book-block{position:relative;z-index:2;margin:0 calc(var(--edge) + 2px) calc(var(--foot) + 2px);min-height:12rem;transform:rotateX(calc(var(--book-rx) * -1)) rotateY(calc(var(--book-ry) * -1)) translateZ(18px);transform-style:preserve-3d;border-radius:.85rem 1.2rem 1.05rem .75rem;overflow:hidden;background:var(--paper-grain),radial-gradient(ellipse 90% 60% at 50% 0%,color-mix(in srgb,var(--paper-bright) 80%,transparent),transparent 55%),linear-gradient(180deg,var(--paper-bright),var(--paper) 40%,var(--paper-deep));box-shadow:inset 0 1px color-mix(in srgb,var(--paper-bright) 75%,transparent),inset 0 0 0 1px color-mix(in srgb,var(--paper-bright) 40%,transparent),0 12px 28px color-mix(in srgb,var(--ink) 12%,transparent)}.book-block-inner{min-height:inherit}.book-curl{position:absolute;right:10px;bottom:calc(var(--foot) + 6px);width:58px;height:58px;z-index:5;pointer-events:none;background:linear-gradient(225deg,color-mix(in srgb,var(--paper-bright) 95%,transparent) 0%,color-mix(in srgb,var(--rice) 90%,transparent) 42%,color-mix(in srgb,var(--slate) 35%,var(--rice)) 70%,transparent 72%);border-radius:0 0 0 100%;box-shadow:-6px -4px 14px #1c16121f,inset 2px 2px #ffffff59;transform:translateZ(20px);opacity:.9}.book-ribbon{position:absolute;top:-14px;right:18%;width:15px;height:62px;z-index:7;pointer-events:none;background:linear-gradient(90deg,rgba(0,0,0,.18),transparent 42%),linear-gradient(180deg,#d65548,var(--vermilion) 70%,#8f2a22);clip-path:polygon(0 0,100% 0,100% 100%,50% 86%,0 100%);border-radius:2px 2px 0 0;box-shadow:3px 8px 14px #1c161252;transform:translateZ(28px) rotate(2deg)}.book-page-flat.panel,.book-block .panel{background:transparent;border:none;box-shadow:none}.book-page-flat.panel:after,.book-block .panel:after{display:none}.book-spread{display:grid;grid-template-columns:1fr 22px 1fr;gap:0;min-height:0;height:100%}.book-binding{position:relative;z-index:2;border-radius:40%;background:radial-gradient(ellipse 120% 40% at 50% 0%,rgba(255,252,246,.35),transparent 50%),linear-gradient(90deg,#33333a29,#33333a0d 32%,#fffcf68c,#33333a0d 68%,#33333a29);box-shadow:inset 0 0 18px #33333a14}.book-binding:before{content:"";position:absolute;top:12%;bottom:12%;left:50%;width:2px;margin-left:-1px;border-radius:2px;background:repeating-linear-gradient(to bottom,rgba(168,50,42,.4) 0 4px,transparent 4px 11px);opacity:.65}.book-page{min-width:0;min-height:0;position:relative;background:var(--paper)}.book-page-left{border-radius:.7rem .15rem .15rem .55rem;background:var(--paper-grain),radial-gradient(ellipse 70% 80% at 100% 50%,rgba(51,51,58,.1),transparent 55%),linear-gradient(90deg,color-mix(in srgb,var(--paper-bright) 55%,transparent) 0%,transparent 22%,transparent 70%,color-mix(in srgb,var(--ink) 7%,transparent) 100%),linear-gradient(180deg,var(--paper-bright),var(--paper-deep));box-shadow:inset -26px 0 36px color-mix(in srgb,var(--ink) 8%,transparent)}.book-page-right{border-radius:.15rem .85rem .7rem .15rem;background:var(--paper-grain),radial-gradient(ellipse 70% 80% at 0% 50%,color-mix(in srgb,var(--ink) 11%,transparent),transparent 55%),linear-gradient(270deg,color-mix(in srgb,var(--paper-bright) 50%,transparent) 0%,transparent 22%,transparent 70%,color-mix(in srgb,var(--ink) 8%,transparent) 100%),linear-gradient(180deg,var(--paper-bright),var(--paper-deep));box-shadow:inset 26px 0 36px color-mix(in srgb,var(--ink) 8%,transparent)}.book-scene--walk .book-block{background:var(--paper-grain),radial-gradient(ellipse 80% 50% at 50% 0%,color-mix(in srgb,var(--paper-bright) 70%,transparent),transparent 55%),linear-gradient(180deg,var(--paper-bright),var(--paper-deep))}.book-scene--walk .walk-stage{padding:.55rem .45rem .6rem;min-height:0;gap:.65rem}@media(prefers-reduced-motion:reduce){.book-volume{--book-rx: 0deg;--book-ry: 0deg}.book-block,.book-edge-right,.book-edge-foot,.book-board,.book-curl,.book-ribbon{transform:none}}.brief-stage{position:relative;min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;overflow:hidden;color:var(--ink);animation:brief-fade .7s ease both}@keyframes brief-fade{0%{opacity:0}to{opacity:1}}.brief-visual{position:relative;min-height:100vh;background:radial-gradient(ellipse 70% 50% at 35% 25%,color-mix(in srgb,var(--slate) 28%,transparent),transparent 70%),radial-gradient(ellipse 45% 40% at 75% 65%,color-mix(in srgb,var(--vermilion) 10%,transparent),transparent 65%),linear-gradient(168deg,#1e2229 0%,var(--ink-deep) 42%,var(--sumi) 100%);box-shadow:inset -28px 0 48px color-mix(in srgb,var(--sumi) 55%,transparent),12px 0 40px color-mix(in srgb,var(--sumi) 40%,transparent)}.brief-ink-wash{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--ink-bloom),radial-gradient(ellipse 50% 40% at 20% 70%,color-mix(in srgb,var(--ink) 35%,transparent),transparent 70%);opacity:.45;mix-blend-mode:soft-light;pointer-events:none;z-index:1}.brief-skyline{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block;z-index:2;filter:drop-shadow(0 20px 28px rgba(0,0,0,.4))}.brief-buildings path{transform-origin:bottom center;animation:brief-rise 1.1s cubic-bezier(.22,1,.36,1) both}.brief-buildings path:nth-child(1){animation-delay:.05s}.brief-buildings path:nth-child(2){animation-delay:.12s}.brief-buildings path:nth-child(3){animation-delay:.18s}.brief-buildings path:nth-child(4){animation-delay:.24s}.brief-buildings path:nth-child(5){animation-delay:.3s}.brief-buildings path:nth-child(6){animation-delay:.36s}.brief-buildings path:nth-child(7){animation-delay:.42s}@keyframes brief-rise{0%{transform:translateY(28px);opacity:0}to{transform:translateY(0);opacity:1}}.brief-road{stroke-dasharray:1400;stroke-dashoffset:1400;animation:brief-draw 1.6s .35s ease forwards}@keyframes brief-draw{to{stroke-dashoffset:0}}.brief-balcony{animation:brief-pulse 2.8s 1s ease-in-out infinite}@keyframes brief-pulse{0%,to{opacity:.55}50%{opacity:1}}.brief-visual-veil{position:absolute;top:0;right:0;bottom:0;left:0;z-index:3;background:linear-gradient(90deg,transparent 48%,color-mix(in srgb,var(--xuan) 35%,transparent) 78%,var(--xuan) 100%);pointer-events:none}.brief-copy{position:relative;z-index:2;display:flex;flex-direction:column;justify-content:center;padding:clamp(1.5rem,4vw,3.5rem) clamp(1.25rem,3.5vw,3rem);background:var(--paper-grain),radial-gradient(ellipse 55% 40% at 90% 8%,color-mix(in srgb,var(--ink) 7%,transparent),transparent 70%),radial-gradient(ellipse 40% 35% at 10% 90%,color-mix(in srgb,var(--slate) 10%,transparent),transparent 65%),linear-gradient(105deg,color-mix(in srgb,var(--paper-bright) 75%,transparent),transparent 45%),linear-gradient(180deg,var(--paper-bright) 0%,var(--xuan) 55%,var(--paper) 100%);min-height:100vh;box-shadow:-18px 0 48px color-mix(in 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