/* Reference-led blue-and-white identity, shared by the working coaching pages. */
:root{font-family:Inter,"Segoe UI",Arial,sans-serif;color:#0d1d46;background:#fafbff;--blue:#2357ed;--ink:#0d1d46;--soft:#edf1ff;--line:#e0e6f2}body{background:#fafbff;color:var(--ink)}a{color:#2357df}.top{background:#fff;color:var(--ink);border-bottom:1px solid #edf0f8;padding:18px max(24px,4vw);gap:26px}.top .brand{color:var(--ink);font-size:30px;gap:13px;font-weight:750}.top .brand span{font-size:23px;letter-spacing:-.04em}.top .brand b{color:#3261df}.top .brand .brand-knight{color:#3f70ff;font-size:46px;line-height:1}.brand-caption{display:block!important;font-size:9px!important;letter-spacing:.13em!important;color:#7080a5;margin-top:1px}.top nav{gap:26px;align-items:center}.top nav a{color:#172b57;font-size:14px;text-decoration:none;font-weight:550}.top nav a:hover{color:#2357ed}.top nav .nav-profile{color:#2357ed;padding-left:28px}h1,h2{font-family:Inter,"Segoe UI",Arial,sans-serif;letter-spacing:-.045em}h1{font-weight:750}h2{font-weight:700}button,.action{border-radius:10px}button.primary,.primary,.action{background:#2357ed;border-color:#2357ed;color:white}.action:hover,button.primary:hover:not(:disabled){background:#1744c9}.action{box-shadow:0 5px 14px #2357ed17}.muted,.instruction{color:#657394}.eyebrow{color:#536b9e}.panel,.coach .tutor{background:#fff;border-color:#dfe5f3;box-shadow:0 8px 30px #203c7c06}.play{background:#eef2fb;border-color:#dce4f4}.board{border-color:#5676a6;box-shadow:0 10px 25px #2342751c}.square{background:#f2f3f5}.square.dark{background:#8daacf}.square:hover:not(:disabled){background:#e1eaff}.square.dark:hover:not(:disabled){background:#789bcb}.square .coord{color:#294572}.square.dark .coord{color:#152d54}.square.last::before{background:#a8b9ff80}.square.selected{box-shadow:inset 0 0 0 4px #245cec}.player img,.bottom img{background:#e0e8fb}.player span{color:#5f7190}.badge,.title .badge,.tutor .section-head .badge{background:#edf2ff;border-color:#dce5fb;color:#526da0}.training-menu,.lesson-library{background:#f7f9ff;border-color:#e0e6f4}.training-choices button,.play>.board-tools button{background:#fff;border-color:#d4dff0;color:#253c67}.tutor #tutor-status{color:#315dd3}.tutor #board-connection{border-color:#edf0f8}.tutor .muted{color:#637594}.auto-coach input{accent-color:#2357ed}.chat-message{background:#f1f5ff;border-color:#e0e8fb}.chat-message.user{background:#e7edff;border-color:#dce4ff}.chat-message strong{color:#365aba}.chat-message span{color:#233960}.tutor textarea,select,textarea,.profile-layout input{background:#fcfdff;border-color:#c8d5ec;color:#1a3059}button{color:#254778;border-color:#cbd8ed}button:hover:not(:disabled){background:#eaf0ff}.play>details{border-color:#d5deee}#lesson-guide,#move-learning{background:#edf3ff;border-left-color:#4d7bff}.profile-layout h2{font-family:inherit;font-size:24px}.profile-layout .danger{color:#963d42}.continue-card{background:#f2f6ff;border-color:#dbe5ff}.continue-card h2{font-size:23px}.membership-page .plans article{background:white;border-color:#dfe5f2}.membership-page .plans article:first-child{background:#eef3ff;border-color:#b8cbff}.membership-page .plans .price{font:700 30px "Segoe UI",sans-serif;letter-spacing:-.04em}.membership-page .funding{border-color:#dfe5f2}footer{border-color:#e2e7f1;color:#71809b}footer a{color:#486492}a:focus-visible,button:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #3870ff;outline-offset:4px}
/* Landing page */
.landing{background:#fff}.landing .top{border:0;max-width:1536px;margin:auto}.landing .coach-home{max-width:1480px;padding:24px 4% 0}.conversation-hero{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.2fr);gap:42px;align-items:center;padding:26px 0 52px}.voice-label{display:inline-flex;align-items:center;gap:9px;border-radius:100px;background:#e9efff;color:#2256e6;font-size:12px;font-weight:750;letter-spacing:.08em;padding:10px 17px;margin:0 0 24px}.voice-label svg{width:19px;height:22px;fill:none;stroke:currentColor;stroke-width:2}.hero-copy h1{font-size:clamp(62px,7.7vw,112px);line-height:.96;margin:5px 0 25px;font-weight:800;letter-spacing:-.065em;color:#08193e}.hero-copy h1 span{color:#2457e9}.hero-description{font-size:clamp(17px,1.65vw,23px);line-height:1.55;max-width:535px;color:#42557e;letter-spacing:-.015em}.home-actions{margin:28px 0 20px;gap:24px}.home-actions .action{font-size:17px;padding:17px 24px;display:flex;gap:25px;align-items:center}.demo-link{font-weight:650;font-size:15px;text-decoration:none}.hero-note{color:#72819b;font-size:15px;margin:0 0 12px}.return-link{font-size:12px;color:#6c7d9d;text-decoration:none}.coach-demo{background:#edf1ff;border:1px solid #e8edff;border-radius:25px;padding:22px;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(180px,.9fr);gap:16px;align-items:center;box-shadow:0 16px 50px #2c54b008}.demo-topline{display:flex;align-items:center;justify-content:space-between;gap:6px;font-size:10px;color:#60749d;margin-bottom:13px}.demo-topline span:first-child{font-weight:650;color:#3d5889}.demo-topline span:last-child{letter-spacing:.1em;font-size:9px}.demo-topline i{display:inline-block;width:6px;height:6px;background:#1ba481;border-radius:50%;margin-right:5px}.demo-board{display:grid;grid-template-columns:repeat(8,1fr);aspect-ratio:1;overflow:hidden;border-radius:5px;border:1px solid #cad7ef;box-shadow:0 6px 15px #24457213}.demo-square{position:relative;aspect-ratio:1;background:#f5f5f2;display:grid;place-items:center}.demo-square.demo-dark{background:#91afd5}.demo-square.demo-highlight{background:#cdd9ff}.demo-square.demo-dark.demo-highlight{background:#718ddd}.demo-square img{width:88%;height:88%;z-index:1}.demo-square small{position:absolute;font:600 8px "Segoe UI",sans-serif;color:#3f5e88}.demo-rank{top:1px;left:2px}.demo-file{bottom:1px;right:2px}.demo-board-caption{display:flex;justify-content:space-between;margin-top:12px;font-size:11px;color:#7381a0}.demo-board-caption span:first-child{color:#1d449b;font-weight:700}.demo-conversation{background:#ffffffef;border:1px solid #fff;border-radius:17px;padding:17px 14px;align-self:stretch;display:flex;flex-direction:column;justify-content:center;gap:10px}.demo-coach-title{display:flex;align-items:center;gap:9px}.coach-avatar{background:#edf2ff;color:#3262ea;border-radius:10px;padding:3px 8px;font-size:27px}.demo-coach-title strong{font-size:13px;display:block}.demo-coach-title div>span{font-size:10px;color:#7483a0}.waveform{display:flex;align-items:center;justify-content:center;height:57px;gap:4px;margin:6px 0}.waveform i{display:block;width:3px;height:16px;background:#5280ff;border-radius:4px}.waveform i:nth-child(3n){height:35px}.waveform i:nth-child(4n){height:48px}.waveform i:nth-child(5n){height:24px}.waveform i:nth-child(7n){height:10px}.demo-question,.demo-answer{margin:0;padding:13px 12px;border-radius:12px;font-size:13px;line-height:1.55;color:#24365c;background:#edf2ff}.demo-answer{background:white;border:1px solid #e5ebf7;box-shadow:0 3px 8px #1f3e7805}.demo-question strong,.demo-answer strong{display:block;font-size:11px;color:#2654be;margin-bottom:4px}.demo-conversation button{font-size:11px;min-height:38px;padding:8px;background:#f6f8ff;border-color:#dfe7f8;text-align:left;margin-top:3px}.demo-disclaimer{font-size:9px;color:#7c8aa3;text-align:center}.benefits{border-top:1px solid #eff2f7;padding:48px 0 40px}.benefits>.eyebrow{text-align:center;font-size:10px;letter-spacing:.13em}.benefits>h2{text-align:center;font-size:clamp(25px,3vw,37px);margin:12px 0 38px;letter-spacing:-.045em}.benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.benefit-grid article{display:flex;gap:16px;border-right:1px solid #e6ebf4;padding-right:22px}.benefit-grid article:last-child{border-right:0}.benefit-icon{background:#e8eeff;width:55px;height:55px;display:grid;place-items:center;flex-shrink:0;border-radius:50%;color:#2e59c1;font-size:30px}.benefit-grid h3{font-size:18px;letter-spacing:-.025em;margin:3px 0 8px}.benefit-grid p{font-size:14px;color:#627395;line-height:1.75;margin:0}.training-paths{border-radius:20px;background:#f6f8ff;border:1px solid #e6ecfa;padding:30px;margin:24px 0 40px}.training-paths h2{font-size:27px}.path-links{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.path-links a{background:white;padding:18px;border:1px solid #e0e8f8;border-radius:12px;text-decoration:none;font-weight:650;color:#1d365f;font-size:15px}.path-links span{display:block;font-weight:400;color:#7383a1;font-size:12px;margin-top:6px}.landing footer{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:15px;font-size:12px;margin-top:0;padding:24px 0}.landing footer p{margin:0}.footer-name{font-weight:650;text-decoration:none}
@media(max-width:1050px){.conversation-hero{gap:24px;grid-template-columns:1fr 1.12fr}.coach-demo{padding:15px;grid-template-columns:1fr}.demo-conversation{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px}.demo-coach-title,.waveform{display:none}.demo-conversation button,.demo-disclaimer{grid-column:1/-1}.demo-disclaimer{font-size:10px}.hero-copy h1{font-size:clamp(58px,8vw,86px)}.demo-board{max-width:360px;margin:auto}.benefit-grid{gap:16px}.benefit-icon{width:42px;height:42px}.benefit-grid article{gap:12px;padding-right:12px}.top nav{gap:17px}}
@media(max-width:700px){.top{padding:15px 20px;align-items:center}.top .brand span{font-size:20px}.top .brand .brand-knight{font-size:37px}.top nav a:not(:last-child){display:none}.top nav .nav-profile{padding-left:0}.landing .coach-home{padding:14px 20px 0}.conversation-hero{grid-template-columns:1fr;padding-top:10px;gap:30px}.voice-label{font-size:10px;margin-bottom:17px}.hero-copy h1{font-size:76px}.hero-description{font-size:18px}.home-actions{flex-direction:row;align-items:center;gap:18px}.home-actions .action{font-size:15px;padding:15px 19px}.demo-link{font-size:13px}.coach-demo{grid-template-columns:1.2fr 1fr;padding:13px;gap:10px;border-radius:18px}.demo-conversation{display:flex;padding:10px;gap:8px}.demo-question,.demo-answer{font-size:11px;padding:9px}.demo-disclaimer{font-size:8px}.demo-conversation button{font-size:10px}.demo-topline{font-size:9px}.demo-topline span:last-child{display:none}.demo-board-caption{font-size:9px}.benefits{padding:30px 0}.benefit-grid,.path-links{grid-template-columns:1fr}.benefit-grid article{padding:16px 0;border-right:0;border-bottom:1px solid #e8edf7}.benefit-grid article:last-child{border:0}.benefits>h2{margin-bottom:15px}.benefit-grid p{font-size:15px}.training-paths{padding:22px}.continue-card{padding:22px}.profile-layout{grid-template-columns:1fr}.coach-demo .demo-square small{font-size:6px}.landing footer{align-items:flex-start;flex-direction:column}}
@media(max-width:390px){.coach-demo{grid-template-columns:1fr}.demo-conversation{display:grid;grid-template-columns:1fr 1fr}.hero-copy h1{font-size:66px}.home-actions{align-items:flex-start;flex-direction:column}.demo-board{max-width:290px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
body:not(.landing) .top{padding:9px 24px}body:not(.landing) .top .brand-knight{font-size:35px}body:not(.landing) .top .brand>span:not(.brand-knight){font-size:19px}body:not(.landing) .brand-caption{font-size:8px!important}body:not(.landing) .top nav{gap:17px}

.coach-help{background:#edf2ff;border:1px solid #dce5ff;border-radius:14px;padding:12px 14px;margin:12px 0;font-size:.9rem;line-height:1.45}.coach-help p{margin:6px 0 0}.coach-help .muted{font-size:.8rem}#inline-trial{padding:12px 0}
/* Keep coordinates outside the playing surface and conversation beside it. */
.board-frame{display:grid;grid-template-columns:22px minmax(0,1fr);grid-template-rows:auto 22px;width:min(100%,calc(100dvh - 208px));margin:auto}
.board-frame .board{grid-column:2;grid-row:1;width:100%;margin:0;border:0;border-radius:0;overflow:hidden}
.board-ranks{grid-column:1;grid-row:1;display:grid;grid-template-rows:repeat(8,1fr)}
.board-files{grid-column:2;grid-row:2;display:grid;grid-template-columns:repeat(8,1fr)}
.board-ranks span,.board-files span{display:grid;place-items:center;font-size:12px;font-weight:600;color:#526789}
.coach .tutor{display:flex;flex-direction:column;position:static}
.tutor>*{order:8}.tutor .section-head{order:0}.tutor #membership-access,.tutor #tutor-status,.tutor #board-connection,.tutor #tutor-signin,.tutor #inline-trial{order:1}
.tutor #chat-log{order:2;min-height:180px;max-height:38dvh;margin:8px 0;overflow:auto}
.tutor #chat-form{order:3}.tutor .coach-help{order:4}.tutor .auto-coach{order:5}.tutor .training-menu,.tutor .lesson-library{order:6}
@media(min-width:701px){body:not(.landing) main{max-width:1500px}.layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(310px,1fr);gap:18px;align-items:start}.layout>.play{order:0;min-width:0;width:100%}.layout>.coach{display:flex;order:1;width:100%;min-width:0;max-height:calc(100dvh - 112px);overflow:auto}.coach .tutor{padding:16px}.board-frame{margin-right:0}.play{padding:12px}.tutor #chat-log{min-height:220px}}
@media(max-width:700px){.layout{display:flex;flex-direction:column}.layout>.play{order:0}.layout>.coach{order:1;width:100%;max-height:none}.board-frame{width:100%}.tutor #chat-log{max-height:300px}}
.tutor #mic-status{order:2;display:block;font-size:13px;font-weight:600;color:#254778;background:#edf3ff;border-radius:8px;padding:9px;margin:6px 0}.tutor #mic-status:empty{display:none}

/* Coaching mode controls stay directly beside the board. */
.coach-mode-bar{display:flex;align-items:center;flex-wrap:wrap;gap:8px 12px;background:#eef3ff;border:1px solid #d4e0ff;border-radius:14px;padding:10px 12px;margin:8px 0}.coach-mode-label{font-size:14px;font-weight:700;color:#243e70}.coach-mode-buttons{display:flex;gap:4px;background:#fff;padding:3px;border-radius:11px}.coach-mode-buttons button{margin:0;padding:9px 16px;min-height:42px;border:1px solid transparent;border-radius:8px;font-size:14px}.coach-mode-buttons button[aria-pressed="true"]{background:#2056e8;color:#fff;border-color:#2056e8}.coach-mode-buttons #voice-stop:not(:disabled){border-color:transparent;color:#244377}.coach-mode-buttons #voice-stop[aria-pressed="true"]{color:white;border-color:#2056e8}.coach-mode-buttons button:focus-visible{outline:3px solid #829fff;outline-offset:2px}#coach-mode-status{font-size:12px;color:#405777}.coach-mode-bar #mic-status{flex-basis:100%;font-size:12px;margin:0;color:#405777}.coach-mode-bar #mic-status:empty{display:none}

.welcome-intro{padding:4px 6px 10px;font-size:13px}.welcome-intro>div{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.welcome-intro button{padding:7px 11px;font-size:13px}.welcome-intro span{color:#526789}.welcome-intro details{margin-top:6px}.welcome-intro summary{cursor:pointer;color:#31548e}.welcome-intro p{line-height:1.6;color:#405777;margin:8px 0}

/* Focused text view keeps the board and composer inside the visible viewport. */
body.text-workspace{overflow:hidden}
.text-workspace .layout{position:fixed;z-index:50;left:0;right:0;top:var(--coach-top,0px);height:var(--coach-vh,100dvh);box-sizing:border-box;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,1fr);grid-template-rows:36px minmax(0,1fr);gap:8px;padding:8px;background:#f6f8ff;overflow:hidden}
.text-workspace-header{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:14px}.text-workspace-header button{padding:6px 12px;font-size:13px}
.text-workspace .layout>.play{grid-row:2;grid-column:1;container-type:size;min-height:0;min-width:0;padding:4px;display:flex;flex-direction:column;justify-content:center;margin:0}
.text-workspace .play>*{display:none}.text-workspace .play>.board-frame{display:grid;width:min(100%,calc(100cqh - 62px));margin:0 auto;flex:none}.text-workspace .play>.coach-mode-bar{display:flex;flex:none;justify-content:center;margin:4px 0;padding:4px;gap:4px 8px;min-height:40px}.text-workspace .coach-mode-label,.text-workspace #coach-mode-status,.text-workspace .coach-mode-bar #mic-status{display:none}
.text-workspace .layout>.coach{grid-row:2;grid-column:2;display:flex;width:100%;min-height:0;max-height:none;overflow:hidden}.text-workspace .coach>.tutor{display:flex;width:100%;box-sizing:border-box;min-height:0;padding:10px;margin:0;overflow:hidden}.text-workspace .coach>*:not(.tutor){display:none}
.text-workspace .tutor>*{display:none!important}.text-workspace .tutor>#chat-log{display:block!important;order:1;flex:1;min-height:0;max-height:none;overflow:auto;margin:0 0 6px}.text-workspace .tutor>#chat-form{display:block!important;order:2;flex:none;margin:0}.text-workspace #chat-form label{font-size:13px;margin:0 0 3px}.text-workspace #chat-input{font-size:16px;min-height:46px;max-height:90px;height:54px;resize:none;margin:0;box-sizing:border-box;width:100%}.text-workspace #chat-form .board-tools{margin:4px 0 0}.text-workspace #chat-send{padding:8px 12px;margin:0;min-height:38px}.text-workspace .tutor>#tutor-status{display:block!important;order:3;font-size:12px;line-height:1.25;margin:4px 0 0;max-height:32px;overflow:auto}.text-workspace .tutor>#tutor-signin:not([hidden]){display:block!important;order:4;font-size:13px}.text-workspace .tutor>#inline-trial:not([hidden]){display:block!important;order:4;font-size:12px}.text-workspace #inline-trial p{margin:2px 0}
@media(max-width:700px){.text-workspace .layout{grid-template-columns:minmax(0,1fr);grid-template-rows:32px minmax(0,1.1fr) minmax(0,1fr);gap:4px;padding:4px;padding-bottom:max(4px,env(safe-area-inset-bottom))}.text-workspace .layout>.play{grid-row:2;grid-column:1}.text-workspace .layout>.coach{grid-row:3;grid-column:1}.text-workspace .play>.board-frame{width:min(100%,calc(100cqh - 52px))}.text-workspace .coach>.tutor{padding:6px}.text-workspace .chat-message{padding:7px 9px;margin:4px 0}.text-workspace .chat-message span{font-size:14px}.text-workspace #chat-form label{display:none}.text-workspace #chat-form{position:relative;padding-right:68px}.text-workspace #chat-form .board-tools{position:absolute;right:0;top:0;margin:0}.text-workspace #chat-send{width:62px;font-size:12px;min-height:46px;padding:5px}.text-workspace #chat-input{height:46px}.text-workspace .coach-mode-buttons button{min-height:34px;padding:5px 12px}}
.text-workspace .layout{align-items:stretch}.text-workspace .layout>.play,.text-workspace .layout>.coach{align-self:stretch;height:100%;box-sizing:border-box}.text-workspace .coach>.tutor{height:100%}
.text-workspace .board-ranks{min-height:0;grid-template-rows:repeat(8,minmax(0,1fr))}.text-workspace .board-ranks span{min-height:0;line-height:1}

/* On phones, size the board to the screen width before allocating chat space. */
@media(max-width:700px){
 .text-workspace .layout{grid-template-rows:32px minmax(0,min(calc(100vw + 38px),calc(var(--coach-vh,100dvh) - 184px))) minmax(0,1fr)}
 .text-workspace .layout>.play{padding:0;border-radius:10px;justify-content:flex-start}
 .text-workspace .play>.board-frame{width:min(100%,calc(100cqh - 46px));grid-template-columns:16px minmax(0,1fr);grid-template-rows:auto 16px}
 .text-workspace .board-ranks span,.text-workspace .board-files span{font-size:10px;line-height:1}
 .text-workspace .play>.coach-mode-bar{margin:2px 0;padding:2px;min-height:36px;border:0;background:transparent}
 .text-workspace .coach-mode-buttons{padding:2px}.text-workspace .coach-mode-buttons button{min-height:30px;padding:4px 12px}
}

.play-coach-button{padding:8px 12px;font-weight:700}.text-workspace .coach-mode-bar .play-coach-button{display:none}.text-workspace-header strong{flex:1}.text-workspace-header button{white-space:nowrap}@media(max-width:700px){.text-workspace-header strong{font-size:12px}.text-workspace-header button{font-size:11px;padding:5px 7px}.text-workspace-header{gap:4px}}

.board-confirmation{border:1px solid #ccd7ed;border-radius:18px;padding:24px;max-width:min(460px,calc(100vw - 28px));color:#10234a;background:#fff;box-shadow:0 20px 70px #07172d55}.board-confirmation::backdrop{background:#07172d88}.board-confirmation h2{margin-top:0}.board-confirmation p{line-height:1.5}.board-confirmation button{margin:6px 8px 0 0;padding:12px;border-radius:10px}.board-confirmation button:last-child{background:#2457ed;color:white}

.home-selection{padding:8px 0 24px}.home-selection>h2{font-size:24px;margin:0 0 16px}.home-selection-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.home-selection-grid>a{display:block;padding:22px;border:1px solid #dce4f4;border-radius:16px;color:#10234a;text-decoration:none;background:#f8faff}.home-selection-grid>a:hover{border-color:#2357ed;background:#edf2ff}.home-selection-grid>a.home-selection-featured{background:#edf2ff;border-color:#a9bdf9}.home-selection-grid h3{font-size:22px;margin:10px 0}.home-selection-grid h3 span{float:right;color:#2357ed}.home-selection-grid p{font-size:15px;line-height:1.5;color:#526585;margin:0}.home-selection-grid .eyebrow{font-size:10px}.landing .top nav{flex-wrap:wrap;gap:16px}@media(max-width:700px){.home-selection-grid{grid-template-columns:1fr;gap:10px}.home-selection-grid>a{padding:16px}.home-selection-grid h3{font-size:20px;margin:6px 0}.home-selection>h2{font-size:22px}.landing .top nav .nav-profile{padding-left:0}}

.board{position:relative}.square.teaching-square{box-shadow:inset 0 0 0 4px #efa900}.teaching-overlay{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:5;overflow:hidden}.teaching-overlay line{stroke:#e89300;stroke-width:.13;stroke-linecap:round;opacity:.88}.teaching-overlay polygon{fill:#e89300;opacity:.88}#clear-teaching-marks{font-size:11px;padding:6px 8px}

.voice-playback-controls{display:flex;gap:10px;align-items:center;font-size:11px}.voice-playback-controls label{display:flex;gap:4px;align-items:center;margin:0}.voice-playback-controls button{font-size:11px;padding:5px 8px}.coach-mode-bar:has(#voice-start[aria-pressed="false"]) .voice-playback-controls{display:none}

.ask-coach-invitation{flex-basis:100%;margin:2px 0;font-size:11px;line-height:1.35;color:#49618b}.voice-playback-controls{flex-wrap:wrap}#voice-interrupt:not(:disabled){background:#2357ed;color:white;border-color:#2357ed;font-weight:650}.text-workspace .ask-coach-invitation{display:none}

#coach-plan,#coach-takeback{font-size:12px;padding:7px 9px}.chat-message button[data-review-revision]{margin:8px 6px 0 0;padding:8px;font-size:12px}@media(max-width:700px){.text-workspace #coach-plan,.text-workspace #coach-takeback,.text-workspace #clear-teaching-marks{font-size:10px;padding:5px}.text-workspace .coach-mode-buttons button{padding:5px 7px}.text-workspace .play>.coach-mode-bar{gap:4px}}

/* Homepage installation invitation */
.landing .home-install{display:flex;align-items:center;gap:22px;padding:24px 28px;margin:0 0 28px;border:1px solid #bdcdff;border-radius:22px;background:linear-gradient(115deg,#edf2ff,#f8faff);box-shadow:0 8px 28px #174bf50a}
.landing .home-install>img{flex:none;border-radius:16px;box-shadow:0 5px 16px #2054f526}
.landing .home-install-copy{flex:1;min-width:0}.landing .home-install .eyebrow{margin:0 0 6px;color:#2054f5;font-size:11px;letter-spacing:.12em}.landing .home-install h2{font:700 clamp(22px,2.4vw,30px)/1.2 system-ui;margin:0 0 8px;color:#07183c}.landing .home-install p{font-size:15px;line-height:1.5;margin:0;color:#36466b}.landing .home-install .install-detail{font-size:12px;margin-top:8px;color:#536483}
.landing .install-cta,.landing .top nav .nav-install{display:inline-flex;align-items:center;justify-content:center;gap:12px;background:#2054f5;color:#fff;border-radius:12px;font-weight:700;text-decoration:none;padding:14px 20px;white-space:nowrap}.landing .top nav .nav-install{padding:9px 13px;font-size:13px}.landing .install-cta:hover,.landing .top nav .nav-install:hover{background:#123dd0;color:#fff}.landing .install-cta:focus-visible,.landing .nav-install:focus-visible{outline:3px solid #081b47;outline-offset:4px}
@media(max-width:700px){.landing .home-install{display:grid;grid-template-columns:48px minmax(0,1fr);gap:14px;padding:20px;margin-bottom:22px}.landing .home-install>img{width:48px;height:48px;border-radius:12px;align-self:start}.landing .home-install h2{font-size:23px}.landing .home-install .install-cta{grid-column:1/-1;width:100%;box-sizing:border-box}.landing .home-install p{font-size:14px}.landing .home-install .install-detail{font-size:11px}.landing .top nav .nav-install{display:inline-flex}}

/* Installation is promoted on the website, never inside the installed app. */
.installed-app .home-install,.installed-app [data-install-app],.installed-app [data-install-promo],.installed-app #install-app{display:none!important}
@media(display-mode:standalone),(display-mode:fullscreen),(display-mode:minimal-ui){.home-install,[data-install-app],[data-install-promo],#install-app{display:none!important}}

#connection-notice{padding:8px 10px;border:1px solid #e6bf71;border-radius:8px;background:#fff6df;color:#624817;font-size:12px;line-height:1.4}.text-workspace .tutor>#connection-notice:not([hidden]){display:block!important;order:0;flex:none;margin:0 0 5px}

/* Shared navigation for browser and installed app, including focused chat. */
.has-site-menu .top>nav{display:none!important}.has-site-menu .top{display:flex;justify-content:space-between}.site-menu-toggle{flex:none;white-space:nowrap;padding:10px 16px;background:#edf2ff;border:1px solid #cfdbfa;color:#173b87;font-weight:700}.site-menu{box-sizing:border-box;width:min(480px,calc(100vw - 28px));max-height:calc(100dvh - 32px);overflow:auto;border:1px solid #dbe4f8;border-radius:22px;padding:22px;color:#10234d;background:#fff;box-shadow:0 24px 90px #08183840}.site-menu::backdrop{background:#10204480}.site-menu-heading{display:flex;align-items:center;gap:12px;margin-bottom:14px}.site-menu h2{font-size:22px;margin:0;flex:1}.site-menu-close{padding:8px 12px}.site-menu nav{display:grid;gap:6px}.site-menu nav a{display:block;padding:12px 14px;border-radius:12px;text-decoration:none;color:#173b87;font-size:16px;font-weight:700;background:#f5f7ff}.site-menu nav a span{display:block;margin-top:4px;font-size:12px;font-weight:400;color:#596b8e}.site-menu nav a:hover{background:#e7eeff}.site-menu a:focus-visible,.site-menu button:focus-visible,.site-menu-toggle:focus-visible{outline:3px solid #2357ed;outline-offset:2px}.text-workspace-header .site-menu-toggle{padding:5px 9px}@media(max-width:700px){.site-menu{padding:17px}.site-menu h2{font-size:19px}.site-menu nav a{padding:10px 12px}}

.top .brand .brand-logo{display:block;width:56px;height:56px;object-fit:contain;flex:none;border-radius:12px}.coach-logo-avatar{object-fit:contain;background:transparent!important;border-radius:10px}.landing .home-install>img{object-fit:contain;background:#fff}@media(max-width:700px){.top .brand .brand-logo{width:44px;height:44px;border-radius:9px}}

.lesson-overview{padding:48px 0;border-top:1px solid #e2e8f5}.lesson-overview>p{max-width:780px;line-height:1.7;color:#465879}.lesson-overview h2{font-size:clamp(26px,3vw,38px);color:#07183c}.lesson-overview-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin:28px 0}.lesson-overview-grid article{padding:22px;border:1px solid #e2e8f5;border-radius:16px;background:#f7f9ff}.lesson-overview-grid h3{margin:0 0 12px;color:#10234d}.lesson-overview-grid p{margin:0;color:#465879;line-height:1.65}@media(max-width:800px){.lesson-overview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:520px){.lesson-overview-grid{grid-template-columns:1fr}.lesson-overview{padding:30px 0}}

#best-moves-toggle{font-size:12px;padding:7px 9px}#best-moves-toggle[aria-pressed="true"]{background:#2054f5;color:white}#best-moves-panel:not([hidden]){display:flex;order:20;flex-basis:100%;align-items:center;justify-content:center;gap:8px;font-size:11px}#best-moves-list{display:flex;gap:5px}#best-moves-list button{padding:5px 9px;font-size:12px;background:#edf2ff;color:#173b87;min-height:30px}.text-workspace.show-best-moves .play>.board-frame{width:min(100%,calc(100cqh - 108px))}@media(max-width:700px){.text-workspace #best-moves-toggle{font-size:10px;padding:5px}.text-workspace.show-best-moves .play>.board-frame{width:min(100%,calc(100cqh - 112px))}#best-moves-panel:not([hidden]){gap:5px}#best-moves-status{font-size:10px}}
/* Blue-and-white visual refinement: depth, rhythm and clear interactive states. */
:root{--ink:#10234b;--blue:#2457ed;--line:#dce5f5;--soft:#f0f5ff}
body{background:radial-gradient(ellipse at 90% 0%,#eaf1ff 0,transparent 48%),#f8faff}
.top{background:#ffffffed;border-bottom:1px solid #dfe7f5;box-shadow:0 3px 20px #17387505}.top .brand .brand-logo{box-shadow:0 3px 10px #10234b12}.brand-caption{color:#52688d}
button,.action,summary,a{touch-action:manipulation}button,.action,.home-selection-grid>a,.lesson-overview-grid article{transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease}
button{font-weight:600}button:disabled{cursor:not-allowed}button.primary,.action,.install-cta{background:linear-gradient(135deg,#3169ff,#204cdc);border-color:#2457ed;box-shadow:0 5px 14px #2457ed24}.action:hover,button.primary:hover:not(:disabled){background:linear-gradient(135deg,#255cf1,#183ec2);box-shadow:0 7px 20px #2457ed30}
.site-menu-toggle{background:#fff;box-shadow:0 2px 6px #16387108;border-color:#dbe5f6}.site-menu nav a{border:1px solid transparent}.site-menu nav a:hover{border-color:#c9d9fb;background:#edf3ff}
.landing{background:radial-gradient(ellipse at 85% 10%,#eef4ff,transparent 45%),#fff}.landing .top{background:transparent}.landing .home-install{background:linear-gradient(115deg,#f4f8ff,#eaf1ff);border-color:#d8e4fb;box-shadow:0 6px 22px #234e9b06}.landing .home-install .install-detail{color:#506487}
.home-selection-grid>a{position:relative;background:#fff;border:1px solid #dfe7f5;border-radius:20px;box-shadow:0 5px 18px #24457207;overflow:hidden}.home-selection-grid>a::before{content:'';display:block;width:32px;height:4px;background:#88aaff;border-radius:4px;margin-bottom:18px}.home-selection-grid>a.home-selection-featured{background:linear-gradient(130deg,#edf4ff,#f9fbff);border-color:#c5d7ff}.home-selection-grid>a.home-selection-featured::before{background:#2457ed}.home-selection-grid h3{letter-spacing:-.025em}.home-selection-grid p{line-height:1.65;color:#4c6082}
.conversation-hero{padding-top:40px}.hero-copy h1 span{color:#2457ed}.voice-label{border:1px solid #d5e2ff;background:#edf3ff;box-shadow:inset 0 1px #fff}.hero-note{color:#536687}.return-link{color:#506587}.coach-demo{background:linear-gradient(140deg,#eaf1ff,#f7faff);border-color:#dbe6ff;box-shadow:0 22px 60px #244c9b12,inset 0 1px #fff}.demo-conversation{box-shadow:0 8px 28px #244c9b09;border-color:#e8eefb}.demo-board{box-shadow:0 8px 22px #18386b1c}.demo-answer{border-color:#dce7fb}
.benefits{border-top:1px solid #e4ebf7}.benefit-icon{background:linear-gradient(140deg,#edf3ff,#dfeaff);color:#2457ed;box-shadow:inset 0 1px #fff}.lesson-overview-grid article{background:linear-gradient(145deg,#fff,#f7faff);border-color:#e0e8f6;box-shadow:0 4px 16px #24457204}
body:not(.landing) .title h1{color:#10234b}.title .badge{background:#fff;border:1px solid #dce6f7;color:#345587}.play{background:linear-gradient(150deg,#f2f6ff,#eaf0fa);border:1px solid #dce5f4;border-radius:20px;box-shadow:0 10px 30px #19386609}.board{border:1px solid #7999c3;box-shadow:0 10px 24px #1c3c701f;border-radius:6px;overflow:hidden}.square{background:#f5f7fb}.square.dark{background:#8daed7}.square.last::before{background:#afc5ff80}.board-ranks span,.board-files span{color:#4e678d}.player strong,.bottom strong{color:#18325d}
.coach .tutor{border-radius:20px;box-shadow:0 10px 30px #19386609}.tutor .section-head{padding-bottom:10px;border-bottom:1px solid #edf1f8}.tutor #tutor-status{color:#244fc1}.chat-message{border:1px solid #e5ebf6;background:#f8faff;border-radius:14px;padding:13px 15px;line-height:1.65}.chat-message.user{background:#edf3ff;border-color:#dce7ff;border-left:3px solid #7098fa}.chat-message strong{font-size:10px;letter-spacing:.09em;color:#45628e}.chat-message span{color:#1f365d}.tutor textarea,select,textarea,.profile-layout input{border-radius:12px;border-color:#cbd9ef;background:#fff;box-shadow:inset 0 1px 3px #203d7004}.tutor textarea:focus{border-color:#5485f5}
.coach-mode-bar{background:#ffffffd9;border-color:#d9e4f6;box-shadow:0 3px 12px #24457205}.coach-mode-buttons{background:#edf2fc;border:1px solid #e1e8f5}.coach-mode-buttons button[aria-pressed="true"]{box-shadow:0 2px 6px #2357ed24}#best-moves-panel:not([hidden]){border-top:1px solid #e6edf9;padding-top:6px}#best-moves-list button{border-color:#cfddfa;background:#edf3ff}
#lesson-guide{border-radius:12px;border:1px solid #d9e5fb;border-left:3px solid #4f7ff0;padding:12px}#lesson-title{color:#1d4796}.membership-page .plans article{border-radius:20px;box-shadow:0 10px 30px #19386608}.membership-page .plans article:first-child{background:linear-gradient(145deg,#eef4ff,#fff)}
.text-workspace .layout{background:linear-gradient(135deg,#f4f8ff,#ecf2fc)}.text-workspace .play,.text-workspace .coach>.tutor{box-shadow:none}.text-workspace .chat-message{padding:8px 11px}.text-workspace #best-moves-panel:not([hidden]){padding-top:2px}
@media(hover:hover) and (prefers-reduced-motion:no-preference){.home-selection-grid>a:hover{transform:translateY(-3px);border-color:#b5ccfb;box-shadow:0 12px 28px #244c9b12}.lesson-overview-grid article:hover{border-color:#cbdcfa}}
@media(max-width:700px){.conversation-hero{padding-top:22px}.home-selection-grid>a{border-radius:16px}.home-selection-grid>a::before{margin-bottom:12px}.play,.coach .tutor{border-radius:16px}.chat-message{padding:10px 12px}.coach-demo{border-radius:20px}.text-workspace .play{border-radius:10px}.text-workspace .coach>.tutor{border-radius:12px}.text-workspace .chat-message{padding:7px 9px}}
@media(prefers-reduced-motion:reduce){button,.action,.home-selection-grid>a,.lesson-overview-grid article{transition:none}}

.coach-mode-bar #voice-connection-status{flex-basis:100%;font-size:13px;line-height:1.5;margin:0;color:#244377}.coach-mode-bar #voice-connection-status:empty{display:none}.text-workspace .coach-mode-bar #voice-connection-status{display:none}


/* Nested lesson navigation stays immediately below the tapped heading. */
.site-menu .menu-branch{margin:0;border:0;padding:0;background:transparent;min-width:0}
.site-menu .menu-branch>summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;min-height:44px;border-radius:12px;background:#edf3ff;color:#173b87;cursor:pointer;font-size:16px;font-weight:700}
.site-menu .menu-branch>summary::-webkit-details-marker{display:none}
.site-menu .menu-branch>summary::after{content:'+';flex:none}
.site-menu .menu-branch[open]>summary::after{content:'−'}
.site-menu .menu-children{display:grid;gap:5px;margin:5px 0 8px 12px;padding-left:8px;border-left:2px solid #c9daf3}
.site-menu .menu-category>summary{font-size:14px;background:#f5f8fd;padding:10px}
.site-menu nav a.menu-lesson-link{font-size:13px;font-weight:500;line-height:1.35;padding:10px;min-height:40px;background:#fff;border:1px solid #e4ebf6;overflow-wrap:anywhere}
.site-menu summary:focus-visible{outline:3px solid #2357ed;outline-offset:2px}
#lesson-menu.lesson-setup-only{width:min(520px,calc(100vw - 24px))}
#lesson-menu.lesson-setup-only .lesson-search-row,#lesson-menu.lesson-setup-only #lesson-categories,#lesson-menu.lesson-setup-only .lesson-browser{display:none}
#lesson-menu.lesson-setup-only .lesson-menu-layout{display:block}
#lesson-menu.lesson-setup-only #lesson-detail{position:static;max-height:none;width:100%}

.lesson-progress-count{display:block;margin-top:3px;font-size:11px;font-weight:500;color:#46648d;line-height:1.3}.lesson-complete-badge{display:block;margin-top:3px;font-size:11px;font-weight:700;color:#176345}.lesson-complete-badge[hidden]{display:none}

.menu-shop-disclosure{font-size:11px;line-height:1.4;color:#46648d;margin:8px 4px}