:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f0e2;--ink:#23264b;--ink-hover:#35396b;--paper:#fffdf7;--border:#e4d9c2;--border-hover:#c4903b;--muted:#6d6650;--muted-2:#8b8268;--muted-3:#9a9076;--link:#a34a2a;--link-hover:#7e3620;--gold:#d98e2b;--gold-hover:#e8a94a;--tan-bg:#efe5ce;--tan-border:#e0d2b2;--tan-hover-bg:#f8eed9;--canvas-bg:#fbf7ec;--canvas-border:#d8cbaa;--green:#3e7a52;--green-bg:#e7f0e4;--green-text:#2c5a3c;--red:#a93b2a;--red-bg:#f6e4de;--red-text:#8a2f21;--teal:#3e6b5e;--overlay:#13152a94;--shadow:0 18px 54px #23264b29}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#121426;--ink:#f4eedf;--ink-hover:#fff;--paper:#1c2038;--border:#343a58;--border-hover:#d9a449;--muted:#cbc2ad;--muted-2:#a9a08f;--muted-3:#8e8779;--link:#f09a73;--link-hover:#ffc0a3;--gold:#e8a94a;--gold-hover:#f4bd65;--tan-bg:#292d48;--tan-border:#3d435f;--tan-hover-bg:#303651;--canvas-bg:#181c32;--canvas-border:#414864;--green:#7fc08e;--green-bg:#193624;--green-text:#a9dfb4;--red:#f08a7a;--red-bg:#45221f;--red-text:#ffc0b6;--teal:#86c2b0;--overlay:#03040cb8;--shadow:0 18px 54px #0000006b}*{box-sizing:border-box}html{scroll-behavior:smooth}html,body{background:var(--bg);margin:0;padding:0}body{color:var(--ink);min-width:320px;font-family:Noto Sans SC,Noto Sans Lao,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,select,textarea{font:inherit}button{color:inherit}a{color:var(--link);text-decoration:none}a:hover{color:var(--link-hover);text-decoration:underline}:focus-visible{outline:3px solid var(--gold);outline-offset:3px}::selection{background:var(--gold);color:#23264b}#root{min-height:100vh}@keyframes fadeUp{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}@keyframes strokeTrace{0%{stroke-dashoffset:2600px}to{stroke-dashoffset:0}}@keyframes glyphFill{0%{fill:#23264b00}to{fill:currentColor}}:root[data-reduce-motion=true] *,:root[data-reduce-motion=true] :before,:root[data-reduce-motion=true] :after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}html{scroll-behavior:auto}}.site-logo-glyph{width:36px;height:36px;box-shadow:0 0 0 1px var(--border);background:#fff url(https://pub-b1ca55f26b8c4b68bed9070080a97700.r2.dev/wendingai.jpg) 50%/cover no-repeat;border-radius:10px;flex:0 0 36px;font-size:0;overflow:hidden}@media (width<=520px){.site-logo-glyph{flex-basis:34px;width:34px;height:34px}}.app{background:var(--bg);min-height:100vh;color:var(--ink);font-family:Noto Sans SC,Noto Sans Lao,sans-serif}.container{max-width:1080px;margin:0 auto;padding:20px}.site-header{z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);background:#f6f0e2eb;position:sticky;top:0}.site-header-inner{align-items:center;gap:14px;max-width:1080px;margin:0 auto;padding:14px 20px;display:flex}.site-logo{cursor:pointer;font:inherit;background:0 0;border:none;align-items:baseline;gap:10px;padding:0;display:flex}.site-logo-glyph{color:var(--link);font-family:Noto Serif Lao,serif;font-size:24px;font-weight:700}.site-logo-cn{color:var(--ink);font-family:Noto Serif SC,serif;font-size:18px;font-weight:700}.site-logo-en{color:var(--muted-2);letter-spacing:.04em;font-size:12px}.btn{cursor:pointer;white-space:nowrap;border:none;border-radius:999px;align-items:center;gap:7px;font-size:14px;transition:border-color .15s,background .15s,color .15s,transform .1s;display:inline-flex}.btn:disabled{cursor:default}.btn-ink{background:var(--ink);color:var(--bg);padding:10px 22px}.btn-ink:hover:not(:disabled){background:var(--ink-hover)}.btn-outline-gold{background:var(--paper);color:var(--ink);border:1px solid var(--border-hover);padding:10px 22px}.btn-outline-gold:hover:not(:disabled){background:var(--tan-hover-bg)}.btn-outline-neutral{background:var(--paper);color:var(--ink);border:1px solid var(--border);padding:8px 18px;font-size:13.5px}.btn-outline-neutral:hover:not(:disabled){border-color:var(--border-hover)}.btn-gold{background:var(--gold);color:var(--ink);padding:11px 22px;font-weight:700}.btn-gold:hover:not(:disabled){background:var(--gold-hover)}.btn-outline-dark{color:var(--bg);background:0 0;border:1px solid #f6f0e266;padding:11px 22px}.btn-outline-dark:hover:not(:disabled){border-color:var(--bg)}.btn-link-solid{background:var(--link);color:var(--bg);padding:11px 24px}.btn-link-solid:hover:not(:disabled){background:var(--link-hover)}.btn-quiz-option{cursor:pointer;text-align:center;border-radius:14px;padding:16px 12px;line-height:1.3;transition:transform .1s}.btn-quiz-option:hover{transform:translateY(-2px)}.card{background:var(--paper);border:1px solid var(--border);border-radius:16px}.card-hover{cursor:pointer;transition:transform .15s,box-shadow .15s,border-color .15s}.card-hover:hover{border-color:var(--border-hover);transform:translateY(-3px);box-shadow:0 10px 24px #23264b1a}.fade-up{animation:.5s both fadeUp}.site-footer{border-top:1px solid var(--border);text-align:center;color:var(--muted-3);padding:20px;font-size:12.5px}.site-header-inner{min-height:64px}.site-logo{min-width:0}.site-logo-copy{flex-direction:column;align-items:flex-start;min-width:0;display:flex}.site-header-actions{align-items:center;gap:8px;margin-left:auto;display:flex}.header-action{min-height:38px;padding:8px 14px}.header-action-icon{border-radius:50%;place-items:center;width:38px;height:38px;padding:0;font-size:18px;display:grid}.floating-coach{z-index:18;box-shadow:var(--shadow);position:fixed;bottom:22px;right:22px}.modal-backdrop{z-index:100;background:var(--overlay);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);place-items:center;padding:18px;display:grid;position:fixed;inset:0}.settings-panel{border:1px solid var(--border);background:var(--paper);width:min(760px,100%);max-height:min(860px,100vh - 36px);box-shadow:var(--shadow);border-radius:24px;flex-direction:column;display:flex;overflow:hidden}.panel-header,.panel-footer{justify-content:space-between;align-items:center;gap:18px;padding:22px 24px;display:flex}.panel-header{border-bottom:1px solid var(--border)}.panel-header h2,.panel-header p,.settings-section h3,.settings-section p{margin:0}.panel-header p,.settings-section-heading p,.danger-zone p{color:var(--muted);margin-top:4px;font-size:13px;line-height:1.65}.panel-kicker{color:var(--link);letter-spacing:.16em;margin-bottom:4px;font-size:11px;font-weight:800;display:block}.icon-close{border:1px solid var(--border);background:var(--bg);cursor:pointer;border-radius:50%;place-items:center;width:38px;height:38px;font-size:22px;display:grid}.panel-body{padding:22px 24px 8px;overflow-y:auto}.settings-section{border-bottom:1px solid var(--border);margin-bottom:24px;padding:0 0 24px}.settings-section:last-child{border-bottom:0}.settings-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:16px;display:grid}.settings-field{flex-direction:column;gap:7px;font-size:13px;font-weight:700;display:flex}.settings-field-wide{grid-column:1/-1}.settings-field input,.settings-field select,.coach-field input,.coach-field select,.coach-field textarea{border:1px solid var(--border);background:var(--bg);width:100%;color:var(--ink);border-radius:12px;padding:11px 12px}.range-control,.secret-control,.connection-row,.panel-footer,.settings-section-heading,.danger-zone{align-items:center;gap:12px;display:flex}.range-control input{flex:1;padding:0}.range-control output{text-align:right;min-width:48px;color:var(--muted)}.secret-control input{flex:1}.secret-control button{border:1px solid var(--border);background:var(--paper);cursor:pointer;border-radius:10px;padding:9px 13px}.toggle-list{gap:10px;margin-top:16px;display:grid}.toggle-row,.remember-row{border:1px solid var(--border);background:var(--bg);border-radius:14px;justify-content:space-between;align-items:center;gap:16px;padding:13px 14px;display:flex}.toggle-row span,.remember-row span{flex-direction:column;gap:2px;display:flex}.toggle-row small,.remember-row small{color:var(--muted);font-size:12px;font-weight:400}.toggle-row input,.remember-row input{width:20px;height:20px;accent-color:var(--gold);flex:none}.settings-section-heading{justify-content:space-between;align-items:flex-start}.segmented-control{border:1px solid var(--border);background:var(--bg);border-radius:999px;flex:none;padding:3px;display:inline-flex}.segmented-control button{cursor:pointer;background:0 0;border:0;border-radius:999px;padding:8px 13px}.segmented-control button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.personal-api-fields{margin-top:16px}.remember-row{justify-content:flex-start;margin-top:12px}.connection-row{flex-wrap:wrap;margin-top:14px}.connection-row>span{color:var(--muted);font-size:13px}.danger-zone{justify-content:space-between}.btn-danger{background:var(--red-bg);color:var(--red-text);border:1px solid var(--red);padding:9px 16px}.panel-footer{border-top:1px solid var(--border);justify-content:flex-end}.coach-screen{padding-top:24px;padding-bottom:64px}.coach-hero{background:var(--ink);color:var(--bg);border-radius:24px;justify-content:space-between;align-items:flex-start;gap:24px;padding:clamp(28px,5vw,50px);display:flex;overflow:hidden}.coach-hero h1{margin:6px 0 12px;font-family:Noto Serif SC,serif;font-size:clamp(28px,4vw,42px)}.coach-hero p{max-width:660px;color:color-mix(in srgb, var(--bg) 78%, transparent);margin:0;line-height:1.8}.coach-grid{grid-template-columns:minmax(230px,.75fr) minmax(0,1.5fr);gap:18px;margin-top:18px;display:grid}.coach-prompts,.coach-card{padding:22px}.coach-prompts h2,.coach-prompts p{margin-top:0}.coach-prompts p{color:var(--muted);font-size:13px;line-height:1.65}.quick-prompt-list{gap:10px;display:grid}.quick-prompt-list button{text-align:left;border:1px solid var(--border);background:var(--bg);color:var(--ink);cursor:pointer;border-radius:13px;padding:12px 13px;line-height:1.55}.quick-prompt-list button:hover{border-color:var(--border-hover);background:var(--tan-hover-bg)}.coach-progress-note{background:var(--tan-bg);color:var(--muted);border-radius:12px;margin-top:16px;padding:12px;font-size:13px}.coach-field{gap:7px;margin-bottom:14px;font-size:13px;font-weight:700;display:grid}.coach-field textarea{resize:vertical;min-height:160px;line-height:1.7}.coach-submit-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.coach-submit-row>span{color:var(--muted-2);font-size:12px}.coach-answer{background:var(--bg);min-height:180px;color:var(--muted);border-radius:14px;margin-top:18px;padding:18px;line-height:1.8}.coach-answer pre{white-space:pre-wrap;word-break:break-word;color:var(--ink);margin:0;font-family:inherit}.coach-error{color:var(--red-text)}.site-footer{background:var(--paper)}.footer-product{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}@media (width<=760px){.site-header-inner{gap:9px;padding:10px 14px}.site-logo-en{display:none}.site-logo-cn{font-size:15px}.header-action-label{display:none}.header-action{justify-content:center;width:38px;padding:0}.settings-panel{border-radius:20px;width:100%;max-height:calc(100vh - 20px)}.panel-header,.panel-body,.panel-footer{padding-left:16px;padding-right:16px}.settings-grid,.coach-grid{grid-template-columns:1fr}.settings-field-wide{grid-column:auto}.settings-section-heading,.danger-zone,.coach-hero{flex-direction:column}.segmented-control{width:100%}.segmented-control button{flex:1}.coach-hero .btn{color:var(--bg)}.floating-coach{bottom:14px;right:14px}}.letter-screen{padding-top:24px;padding-bottom:64px}.letter-screen-top,.letter-navigation,.letter-identity,.letter-tags,.example-panel,.example-word,.writing-tabs,.stroke-player-toolbar,.stroke-player-actions,.trace-actions,.stroke-step-copy,.practice-status{align-items:center;display:flex}.letter-screen-top{flex-wrap:wrap;justify-content:space-between;gap:14px;margin-bottom:18px}.letter-position{color:var(--muted-2);font-size:13.5px}.letter-position span{color:var(--muted-3);margin-left:8px}.letter-navigation{flex-wrap:wrap;gap:8px}.letter-layout{grid-template-columns:minmax(300px,.9fr) minmax(360px,1.1fr);align-items:start;gap:18px;display:grid}.letter-info-card,.writing-card{padding:26px}.letter-identity{flex-wrap:wrap;gap:24px}.letter-large{min-width:120px;color:var(--ink);text-align:center;font-family:Noto Serif Lao,serif;font-size:clamp(96px,12vw,140px);line-height:1.05}.letter-meta{gap:9px;display:grid}.letter-meta>strong{font-size:27px}.letter-tags{flex-wrap:wrap;gap:8px}.letter-tags span{background:var(--tan-bg);color:var(--muted);border-radius:999px;padding:5px 11px;font-size:12.5px}.letter-detail-stack{gap:12px;margin-top:20px;display:grid}.detail-panel{background:var(--bg);border-radius:13px;padding:13px 15px}.detail-panel p{color:var(--muted);margin:5px 0 0;font-size:13.5px;line-height:1.7}.detail-label{color:var(--link);letter-spacing:.08em;font-size:11.5px;font-weight:800}.tone-panel{justify-content:space-between;align-items:center;gap:14px;display:flex}.tone-panel svg{flex:none;width:120px;height:48px}.tone-panel line{stroke:var(--tan-border);stroke-width:1px;stroke-dasharray:3 3}.tone-panel path{fill:none;stroke:var(--link);stroke-width:3.5px;stroke-linecap:round}.similar-list{flex-wrap:wrap;gap:8px;margin-top:9px;display:flex}.similar-list button{gap:8px;padding:8px 13px}.similar-list button span{font-family:Noto Serif Lao,serif;font-size:25px;line-height:1}.similar-list small,.example-word small{color:var(--muted-2)}.detail-help{font-size:12px!important}.example-panel{flex-wrap:wrap;justify-content:space-between;gap:12px}.example-word{flex-wrap:wrap;gap:9px;margin-top:5px}.example-word strong{font-family:Noto Serif Lao,serif;font-size:25px}.letter-audio-button{justify-self:start}.writing-tabs{flex-wrap:wrap;gap:8px;margin-bottom:18px}.stroke-player{gap:14px;display:grid}.stroke-player-toolbar{justify-content:space-between;gap:12px}.stroke-mode-switch button{padding:7px 13px}.stroke-count{color:var(--muted-2);font-size:12.5px}.stroke-stage{aspect-ratio:1;border:1px dashed var(--canvas-border);background:linear-gradient(90deg,transparent calc(50% - .5px),color-mix(in srgb,var(--canvas-border) 55%,transparent) 50%,transparent calc(50% + .5px)),linear-gradient(0deg,transparent calc(50% - .5px),color-mix(in srgb,var(--canvas-border) 55%,transparent) 50%,transparent calc(50% + .5px)),repeating-linear-gradient(0deg,var(--bg) 0,var(--bg) 1px,transparent 1px,transparent 40px),repeating-linear-gradient(90deg,var(--bg) 0,var(--bg) 1px,transparent 1px,transparent 40px),var(--canvas-bg);border-radius:16px;width:min(360px,100%);margin:0 auto;overflow:hidden}.stroke-svg{width:100%;height:100%;display:block}.stroke-glyph{dominant-baseline:alphabetic;font-family:Noto Serif Lao,serif;font-size:200px;font-weight:400}.stroke-glyph-ghost{fill:color-mix(in srgb,var(--ink) 8%,transparent)}.stroke-glyph-reveal,.stroke-glyph-final{fill:var(--ink)}.stroke-glyph-final{opacity:0}.stroke-centerline-guide{fill:none;stroke:color-mix(in srgb,var(--gold) 70%,transparent);stroke-width:2.5px;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:5 6}.stroke-start{opacity:.58}.stroke-start.active{opacity:1}.stroke-start circle{fill:var(--gold);stroke:var(--paper);stroke-width:2px}.stroke-start text{fill:var(--ink);font-family:inherit;font-size:10px;font-weight:800}.stroke-start line{stroke:var(--gold);stroke-width:2px}.stroke-player-actions{flex-wrap:wrap;justify-content:center;gap:8px}.stroke-step-copy,.practice-status{background:var(--tan-bg);border-radius:12px;flex-direction:column;align-items:flex-start;gap:5px;padding:12px 14px}.stroke-step-copy strong,.practice-status strong{font-size:13px}.stroke-step-copy span,.practice-status span{color:var(--muted);font-size:12.5px;line-height:1.6}.trace-practice{justify-items:center;gap:14px;display:grid}.trace-practice canvas{aspect-ratio:1;border:1px dashed var(--canvas-border);background:linear-gradient(90deg,transparent calc(50% - .5px),color-mix(in srgb,var(--canvas-border) 55%,transparent) 50%,transparent calc(50% + .5px)),linear-gradient(0deg,transparent calc(50% - .5px),color-mix(in srgb,var(--canvas-border) 55%,transparent) 50%,transparent calc(50% + .5px)),var(--canvas-bg);touch-action:none;cursor:crosshair;border-radius:16px;width:min(360px,100%)}.trace-actions{flex-wrap:wrap;justify-content:center;gap:8px}.practice-status{width:100%}.practice-status.done{background:var(--green-bg)}.practice-status.done strong{color:var(--green-text)}@keyframes centerline-write{0%{stroke-dashoffset:1px}to{stroke-dashoffset:0}}@keyframes stroke-finalize{0%{opacity:0}to{opacity:1}}html[data-reduce-motion=true] .stroke-centerline-guide{stroke-dasharray:none}html[data-reduce-motion=true] .stroke-glyph-final{opacity:1!important;animation:none!important}@media (prefers-reduced-motion:reduce){.stroke-centerline-guide{stroke-dasharray:none}}@media (width<=860px){.letter-layout{grid-template-columns:1fr}}@media (width<=560px){.letter-screen{padding-top:15px}.letter-info-card,.writing-card{padding:18px}.letter-position span{display:none}.letter-navigation{width:100%}.letter-navigation .btn{flex:1;justify-content:center}.stroke-player-toolbar,.tone-panel{flex-direction:column;align-items:flex-start}.stroke-stage,.trace-practice canvas{width:100%}}