/* A quiet reading surface, leaving the Three.js scene visible alongside it. */
.sutra-reader{--sutra-paper:#f8f3e8;--sutra-ink:#303c39;--sutra-muted:#7a7c6b;--sutra-line:#b6a16a42;--sutra-gold:#88703e;--sutra-chip:#ece5d5;--sutra-accent:#1c4b48;position:fixed;z-index:24;top:93px;right:24px;bottom:24px;width:min(460px,calc(100vw - 48px));display:flex;flex-direction:column;overflow:hidden;background:var(--sutra-paper);color:var(--sutra-ink);border:1px solid #d8c69788;border-radius:17px;box-shadow:0 15px 80px #001c3266;isolation:isolate;color-scheme:light;font-family:"Microsoft YaHei","PingFang SC",sans-serif;transition:background .2s,color .2s}
.sutra-reader[data-theme=night]{--sutra-paper:#173735;--sutra-ink:#e9e3d0;--sutra-muted:#b0b7a5;--sutra-line:#d5c79a35;--sutra-gold:#d5bf8b;--sutra-chip:#244844;--sutra-accent:#e3ce9c;color-scheme:dark;border-color:#cab67d66}
.sutra-reader button,.sutra-reader select{font-family:inherit;color:var(--sutra-ink);background:transparent;border:1px solid transparent;border-radius:7px;min-height:40px;line-height:1.3;cursor:pointer;box-shadow:none}
.sutra-reader button:hover{background:var(--sutra-chip)}
.sutra-reader button:disabled{opacity:.35;cursor:default}
.sutra-reader button:focus-visible,.sutra-reader select:focus-visible,.sutra-reader a:focus-visible,.sutra-viewport:focus-visible{outline:2px solid var(--sutra-gold);outline-offset:-2px}
.sutra-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:19px 20px 13px;flex-shrink:0}
.sutra-heading-group{display:flex;align-items:baseline;gap:14px}
.sutra-kicker{font-size:10px;letter-spacing:2px;color:var(--sutra-gold)}
.sutra-head h2{font-family:"Songti SC",SimSun,serif;font-size:24px;font-weight:400;letter-spacing:5px;margin:0}
.sutra-head-actions{display:flex;gap:2px}
.sutra-reader .sutra-icon{min-width:36px;min-height:36px;padding:0;font-size:24px;color:var(--sutra-muted)}
.sutra-reader .sutra-expand{font-size:20px}
.sutra-choices{display:flex;gap:6px;margin:0 18px 11px;padding-bottom:5px;flex-shrink:0;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--sutra-line) transparent;overscroll-behavior-x:contain}
.sutra-reader .sutra-choice{flex:0 0 119px;min-height:60px;padding:9px 5px;text-align:center;background:transparent;border:1px solid var(--sutra-line);border-radius:9px}
.sutra-reader .sutra-choice[aria-pressed=true]{color:var(--sutra-accent);background:var(--sutra-chip);border-color:var(--sutra-gold)}
.sutra-choice-title{display:block;font-family:"Songti SC",SimSun,serif;font-size:17px;letter-spacing:1px}
.sutra-choice small{display:block;margin-top:5px;font-size:10px;letter-spacing:0;color:var(--sutra-muted);white-space:nowrap}
.sutra-tools{display:flex;align-items:center;justify-content:space-between;gap:7px;padding:0 16px 9px;border-bottom:1px solid var(--sutra-line);flex-shrink:0}
.sutra-font-tools,.sutra-auto-tools{display:flex;align-items:center;gap:0}
.sutra-reader .sutra-tool{padding:5px 7px;font-size:12px;white-space:nowrap}
.sutra-reader .sutra-font-tools .sutra-tool{font-size:15px;min-width:35px;padding:5px}
.sutra-font-value{min-width:20px;text-align:center;color:var(--sutra-muted);font-size:11px;font-variant-numeric:tabular-nums}
.sutra-reader .sutra-auto-button[aria-pressed=true]{border-color:var(--sutra-line);background:var(--sutra-chip)}
.sutra-reader .sutra-speed{font-size:12px;min-width:37px;width:42px;padding:5px 0 5px 3px}
.sutra-reader select option{background:var(--sutra-paper);color:var(--sutra-ink)}
.sutra-media{padding:7px 18px 9px;border-bottom:1px solid var(--sutra-line);flex-shrink:0;display:grid;gap:5px}
.sutra-media-head{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;color:var(--sutra-muted)}
.sutra-media-credit{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sutra-media-source{flex-shrink:0;color:var(--sutra-gold);text-decoration:none}
.sutra-recording{width:100%;height:34px}
.sutra-media-actions{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.sutra-reader .sutra-instrument,.sutra-reader .sutra-guide-button,.sutra-reader .sutra-video-button{min-height:34px;padding:5px 9px;border:1px solid var(--sutra-line);background:var(--sutra-chip);color:var(--sutra-accent);font-size:11px}
.sutra-reader .sutra-instrument{border-radius:18px;font-weight:600}
.sutra-woodfish:before{content:'◖';display:inline-block;margin-right:5px;color:var(--sutra-gold);font-size:19px;vertical-align:-2px;transform:rotate(-22deg)}
.sutra-instrument-tap{animation:woodfish-tap .2s ease-out}
@keyframes woodfish-tap{50%{transform:rotate(7deg) scale(.85)}}
.sutra-recording-video{width:100%;height:170px;border:0;border-radius:7px;background:#111}
.sutra-media-note{display:block;font-size:10px;line-height:1.45;color:var(--sutra-muted)}
.sutra-media [hidden]{display:none!important}
.sutra-paragraph.sutra-current{background:color-mix(in srgb,var(--sutra-gold) 22%,transparent);border-radius:6px;box-shadow:0 0 0 5px color-mix(in srgb,var(--sutra-gold) 22%,transparent);color:var(--sutra-accent)}
.sutra-chapter-nav{display:flex;gap:5px;align-items:center;padding:5px 18px;border-bottom:1px solid var(--sutra-line);flex-shrink:0}
.sutra-reader .sutra-chapter-step{font-family:serif;font-size:26px;min-width:35px;height:36px;min-height:36px;padding:0}
.sutra-reader .sutra-chapter-select{width:0;flex:1;min-height:36px;padding:5px;font-size:13px;text-align:center;color:var(--sutra-accent)}
.sutra-page-stage{position:relative;display:flex;flex:1;min-height:0;isolation:isolate}
.sutra-viewport{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;touch-action:pan-y;scrollbar-width:thin;scrollbar-color:var(--sutra-line) transparent;-webkit-overflow-scrolling:touch}
.sutra-page-sheet{position:absolute;inset:0;z-index:2;pointer-events:none;overflow:hidden;border:1px solid var(--sutra-line);background:linear-gradient(90deg,color-mix(in srgb,var(--sutra-paper) 78%,#aa865c) 0%,var(--sutra-paper) 13%,var(--sutra-paper) 76%,color-mix(in srgb,var(--sutra-paper) 70%,#967044) 100%);box-shadow:inset 17px 0 27px #3c2b191a,inset -12px 0 21px #3c2b191c,0 3px 24px #261c163e;backface-visibility:hidden;will-change:transform}
.sutra-page-sheet[hidden]{display:none!important}
.sutra-page-sheet::before{content:"";position:absolute;inset:10% 13%;border-left:1px solid var(--sutra-line);border-right:1px solid var(--sutra-line);opacity:.8}
.sutra-page-sheet-mark{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--sutra-gold);font:normal 28px "Songti SC",SimSun,serif;opacity:.72}
.sutra-page-turn-next{animation:sutra-turn-next .52s ease-in-out both}
.sutra-page-turn-previous{animation:sutra-turn-previous .52s ease-in-out both}
@keyframes sutra-turn-next{0%{transform-origin:right center;transform:scaleX(0) skewY(-2deg)}48%{transform-origin:right center;transform:scaleX(1) skewY(0)}52%{transform-origin:left center;transform:scaleX(1) skewY(0)}100%{transform-origin:left center;transform:scaleX(0) skewY(2deg)}}
@keyframes sutra-turn-previous{0%{transform-origin:left center;transform:scaleX(0) skewY(2deg)}48%{transform-origin:left center;transform:scaleX(1) skewY(0)}52%{transform-origin:right center;transform:scaleX(1) skewY(0)}100%{transform-origin:right center;transform:scaleX(0) skewY(-2deg)}}
.sutra-page-nav{display:grid;grid-template-columns:minmax(92px,1fr) auto minmax(92px,1fr);align-items:center;gap:7px;padding:5px 15px;border-top:1px solid var(--sutra-line);background:var(--sutra-paper);flex-shrink:0}
.sutra-reader .sutra-page-button{min-height:38px;padding:5px 10px;border:1px solid var(--sutra-line);border-radius:20px;background:var(--sutra-chip);color:var(--sutra-accent);font-size:12px;white-space:nowrap}
.sutra-page-button:first-child{justify-self:start}.sutra-page-button:last-child{justify-self:end}
.sutra-page-number{min-width:85px;text-align:center;color:var(--sutra-muted);font-size:11px;font-variant-numeric:tabular-nums}
.sutra-text{padding:29px 29px 20px;font-family:"Noto Serif CJK TC","Songti TC","Songti SC","PMingLiU",SimSun,serif;font-size:22px;line-height:2.05;letter-spacing:.035em;overflow-wrap:anywhere}
.sutra-text-title{font:400 1.13em/1.75 "Noto Serif CJK TC","Songti TC","Songti SC","PMingLiU",SimSun,serif;letter-spacing:.1em;text-align:center;margin:0 0 9px;color:var(--sutra-accent)}
.sutra-text .sutra-translator{font-size:12px;text-align:center;letter-spacing:.06em;line-height:1.8;margin:0 0 7px;color:var(--sutra-muted)}
.sutra-chapter-title{font-size:.84em;line-height:1.8;font-weight:400;text-align:center;letter-spacing:.07em;margin:18px 0 0;color:var(--sutra-gold)}
.sutra-text-rule{font-size:15px;color:var(--sutra-gold);display:flex;align-items:center;justify-content:center;gap:14px;margin:17px 20px 20px;opacity:.75}
.sutra-text-rule:before,.sutra-text-rule:after{content:"";display:block;width:40px;height:1px;background:var(--sutra-line)}
.sutra-text .sutra-paragraph{font:inherit;line-height:inherit;letter-spacing:inherit;margin:0 0 1.05em;white-space:pre-line;text-align:start;color:var(--sutra-ink)}
.sutra-reading-end{font-family:"Microsoft YaHei","PingFang SC",sans-serif;font-size:12px;letter-spacing:4px;text-align:center;color:var(--sutra-muted);border-top:1px solid var(--sutra-line);padding:23px 0 14px;margin:29px 0 0}
.sutra-foot{padding:11px 23px 13px;border-top:1px solid var(--sutra-line);flex-shrink:0;background:var(--sutra-paper)}
.sutra-progress-row,.sutra-source-row{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--sutra-muted);font-size:10px;line-height:1.65}
.sutra-progress-track{height:2px;border-radius:2px;overflow:hidden;background:var(--sutra-line);margin:7px 0}
.sutra-progress-fill{display:block;width:0;height:100%;background:var(--sutra-gold)}
.sutra-reader .sutra-source{color:var(--sutra-gold);text-decoration:none;text-align:right;font-size:10px;max-width:75%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sutra-source:hover{text-decoration:underline}
.sutra-message{text-align:center;padding:46px 27px;color:var(--sutra-muted)}
.sutra-message-title{font-family:"Songti SC",SimSun,serif;font-size:21px;color:var(--sutra-ink);margin:0 0 13px}
.sutra-message-detail{font-size:13px;line-height:1.8;margin:0 0 18px}
.sutra-reader .sutra-retry{border-color:var(--sutra-line);padding:8px 20px;background:var(--sutra-chip);font-size:14px}
.sutra-resume{position:fixed;z-index:24;right:25px;top:101px;min-height:46px;padding:10px 19px;background:#193c38ed;color:#f2e3bc;border:1px solid #b8a47699;border-radius:25px;box-shadow:0 8px 30px #001c3244;font-size:14px;letter-spacing:1px}
.sutra-resume:hover{background:#28534e}
.sutra-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(min-width:761px){.sutra-reader.sutra-reader-expanded{width:min(560px,calc(100vw - 48px))}.sutra-reader-expanded .sutra-text{padding-left:40px;padding-right:40px}}
@media(max-width:760px){.sutra-reader{top:auto;left:0;right:0;bottom:0;width:100%;height:70dvh;max-height:calc(100dvh - 79px);border-radius:19px 19px 0 0;border-bottom:0;box-shadow:0 -8px 70px #001c3250}.sutra-reader.sutra-reader-expanded{height:90dvh;max-height:calc(100dvh - 72px)}.sutra-head{padding:13px 17px 10px}.sutra-heading-group{gap:12px}.sutra-head h2{font-size:21px}.sutra-reader .sutra-icon{min-width:40px;min-height:40px}.sutra-choices{margin:0 14px 7px;gap:5px}.sutra-reader .sutra-choice{min-height:52px;padding:7px 3px}.sutra-choice-title{font-size:16px}.sutra-choice small{font-size:10px;margin-top:4px}.sutra-tools{padding:0 11px 5px;gap:2px}.sutra-reader .sutra-tool{min-height:40px;padding:5px;font-size:12px}.sutra-reader .sutra-font-tools .sutra-tool{font-size:15px;min-width:33px}.sutra-font-value{min-width:16px}.sutra-reader .sutra-speed{min-height:40px;width:40px}.sutra-chapter-nav{padding:2px 13px}.sutra-text{padding:23px 25px 20px}.sutra-page-nav{padding:4px 12px}.sutra-reader .sutra-page-button{min-height:38px}.sutra-foot{padding:8px 20px max(10px,env(safe-area-inset-bottom))}.sutra-progress-track{margin:5px 0}.sutra-progress-row,.sutra-source-row,.sutra-reader .sutra-source{font-size:10px}.sutra-resume{top:auto;right:16px;bottom:calc(83px + env(safe-area-inset-bottom));min-height:46px}}

/* Reading controls and source notes must not shrink into faint 10px text. */
.sutra-kicker,.sutra-choice small,.sutra-media-note,.sutra-progress-row,.sutra-source-row,.sutra-reader .sutra-source{font-size:12px}
.sutra-media-head,.sutra-page-number,.sutra-font-value{font-size:12px}
@media(max-width:760px){.sutra-choice small,.sutra-progress-row,.sutra-source-row,.sutra-reader .sutra-source{font-size:11px}}
@media(max-width:760px) and (max-height:700px){.sutra-reader{height:calc(100dvh - 56px);max-height:none}.sutra-head{padding-top:8px;padding-bottom:6px}.sutra-kicker{display:none}.sutra-head h2{font-size:19px;white-space:nowrap}.sutra-choices{margin-bottom:4px}.sutra-reader .sutra-choice{flex-basis:104px;height:46px;min-height:46px;padding-top:4px;padding-bottom:4px;overflow:hidden}.sutra-choice-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sutra-choice small{display:none}.sutra-media{padding-top:3px;padding-bottom:3px}.sutra-media-actions{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin}.sutra-media-actions>*{flex:0 0 auto}.sutra-media-note{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sutra-foot{padding-top:3px;padding-bottom:max(4px,env(safe-area-inset-bottom))}.sutra-progress-track{margin:3px 0}}
@media(max-height:560px) and (min-width:761px){.sutra-reader{top:78px;bottom:12px}.sutra-head{padding-top:8px;padding-bottom:6px}.sutra-choices{margin-bottom:5px}.sutra-reader .sutra-choice{min-height:48px;padding:5px}.sutra-tools{padding-bottom:3px}.sutra-text{padding-top:18px}.sutra-foot{padding-top:6px;padding-bottom:7px}}
@media(max-width:760px) and (max-height:500px){.sutra-reader{left:auto;right:10px;top:69px;bottom:8px;width:min(460px,65vw);height:auto;max-height:none;border-radius:12px}.sutra-reader.sutra-reader-expanded{height:auto;max-height:none;width:calc(100vw - 20px)}.sutra-head{padding:4px 12px}.sutra-head h2{font-size:18px}.sutra-choices{margin:0 10px 4px}.sutra-reader .sutra-choice{min-height:37px;padding:4px}.sutra-choice small{display:none}.sutra-tools{padding-bottom:2px}.sutra-reader .sutra-tool,.sutra-reader .sutra-speed{min-height:33px}.sutra-foot{padding:5px 14px}.sutra-source-row{display:none}.sutra-text{padding:16px 23px}}
@media(prefers-reduced-motion:reduce){.sutra-reader,.sutra-reader button{transition:none}}
@media(prefers-reduced-motion:reduce){.sutra-instrument-tap{animation:none}}
@media(prefers-reduced-motion:reduce){.sutra-page-turn-next,.sutra-page-turn-previous{animation:none}}