:root{--blue:#1769e0;--blue2:#0f56bd;--ink:#10213e;--muted:#61708a;--bg:#f4f7fb;--card:#fff;--line:#dce4ef;--soft:#edf4ff;--success:#27865d;--shadow:0 18px 45px rgba(30,66,120,.12)}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}button,input{font:inherit}button{cursor:pointer}.hidden{display:none!important}
.shell{min-height:100vh;display:grid;grid-template-rows:72px 1fr 78px}.topbar{background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:800}.logo{width:42px;height:42px;border-radius:14px;background:linear-gradient(145deg,var(--blue),#66a3ff);color:#fff;display:grid;place-items:center;font-weight:900;box-shadow:0 10px 22px rgba(23,105,224,.25)}.top-actions{display:flex;gap:10px}.icon-btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;padding:10px 13px;font-weight:700}
.main{padding:26px;max-width:1450px;width:100%;margin:0 auto}.page{display:none}.page.active{display:block}.home-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(390px,.95fr);gap:28px;align-items:center;min-height:calc(100vh - 210px)}.welcome h1{font-size:clamp(34px,4vw,56px);line-height:1.06;margin:6px 0 16px}.welcome p{font-size:20px;color:var(--muted);max-width:640px}.eyebrow{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);font-weight:800}.primary-card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:30px;box-shadow:var(--shadow)}.home-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.action{border:1px solid var(--line);background:#fff;border-radius:18px;padding:20px;text-align:left;min-height:122px;transition:.18s}.action:hover{transform:translateY(-2px);border-color:#aac8f6;box-shadow:0 12px 28px rgba(23,105,224,.1)}.action .emoji{font-size:28px}.action strong{display:block;font-size:18px;margin:8px 0 5px}.action span{color:var(--muted);font-size:14px}.recent{margin-top:18px;border-top:1px solid var(--line);padding-top:18px;color:var(--muted)}
.companion-stage{display:flex;align-items:center;justify-content:center;min-height:560px;position:relative}.companion-panel{width:min(470px,100%);text-align:center;background:linear-gradient(180deg,#fff,#f4f8ff);border:1px solid var(--line);border-radius:30px;padding:28px;box-shadow:var(--shadow);position:relative}.avatar-wrap{width:310px;height:310px;margin:0 auto 16px;border-radius:50%;padding:8px;background:linear-gradient(145deg,#4a91f3,#a5c8ff);box-shadow:0 22px 55px rgba(23,105,224,.28)}.avatar-wrap img{width:100%;height:100%;object-fit:cover;border-radius:50%;display:block}.status{display:inline-flex;align-items:center;gap:8px;color:var(--success);font-weight:800;font-size:14px}.dot{width:9px;height:9px;border-radius:50%;background:var(--success)}.companion-panel h2{margin:8px 0 5px;font-size:30px}.companion-panel p{margin:0;color:var(--muted);font-size:17px}.change{margin-top:18px;border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:12px;padding:11px 16px;font-weight:800}
.bottom-nav{position:fixed;left:0;right:0;bottom:0;height:78px;background:rgba(255,255,255,.98);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:30}.bottom-nav button{border:0;background:transparent;color:var(--muted);font-weight:700;font-size:13px}.bottom-nav button.active{color:var(--blue)}.bottom-nav .nav-icon{display:block;font-size:22px;margin-bottom:4px}
.help-layout{height:calc(100vh - 176px);display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:22px}.chat-card,.side-card,.content-card{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.chat-card{display:flex;flex-direction:column;min-height:0;overflow:hidden}.chat-head{padding:16px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.chat-person{display:flex;align-items:center;gap:12px}.mini-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover}.messages{flex:1;overflow:auto;padding:22px;display:flex;flex-direction:column;gap:14px}.bubble{max-width:76%;padding:14px 16px;border-radius:18px;line-height:1.45}.bubble.ai{background:var(--soft);border:1px solid #d6e6ff}.bubble.user{background:var(--blue);color:#fff;align-self:flex-end}.typing{color:var(--muted);font-style:italic}.composer{padding:14px;border-top:1px solid var(--line);display:flex;gap:10px;background:#fff;position:sticky;bottom:0}.composer input{flex:1;min-width:0;border:1px solid var(--line);border-radius:14px;padding:14px 15px;font-size:17px}.send,.mic{border:0;border-radius:14px;font-weight:800}.send{background:var(--blue);color:#fff;padding:0 20px}.mic{width:52px;background:#eef4fd;color:var(--blue);font-size:20px}.mic.listening{background:#ffe9e9;color:#b42318}.side-card{padding:20px}.side-card h3{margin-top:0}.quick{display:block;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:13px;padding:13px;margin:9px 0;color:var(--ink)}
.content-card{padding:26px}.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.section-title h1{margin:0}.device-grid,.learn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.device,.lesson{border:1px solid var(--line);border-radius:18px;padding:20px;background:#fff}.device .big,.lesson .big{font-size:32px}.device h3,.lesson h3{margin:10px 0 6px}.device p,.lesson p{color:var(--muted);margin:0}.pill{display:inline-block;margin-top:12px;padding:7px 10px;border-radius:999px;background:#e8f7ef;color:var(--success);font-size:12px;font-weight:800}.btn-primary{border:0;background:var(--blue);color:#fff;border-radius:13px;padding:12px 16px;font-weight:800}.btn-secondary{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:13px;padding:12px 16px;font-weight:800}
.modal{position:fixed;inset:0;background:rgba(8,22,42,.58);display:grid;place-items:center;padding:20px;z-index:100}.modal-card{width:min(900px,100%);max-height:90vh;overflow:auto;background:#fff;border-radius:24px;padding:24px}.modal-head{display:flex;justify-content:space-between;align-items:center}.avatar-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:18px}.avatar-choice{border:2px solid transparent;background:#f8faff;border-radius:18px;padding:12px;text-align:center}.avatar-choice.selected{border-color:var(--blue);background:#eef5ff}.avatar-choice img{width:100%;aspect-ratio:1;border-radius:50%;object-fit:cover}.avatar-choice strong{display:block;margin-top:8px}.close{border:0;background:#eef2f7;width:40px;height:40px;border-radius:50%;font-size:20px}
.toast{position:fixed;right:24px;bottom:96px;background:#10213e;color:#fff;padding:13px 16px;border-radius:12px;box-shadow:var(--shadow);z-index:110}
@media(max-width:980px){.home-grid{grid-template-columns:1fr}.companion-stage{min-height:auto}.companion-panel{width:min(520px,100%)}.help-layout{grid-template-columns:1fr;height:calc(100vh - 176px)}.side-card{display:none}.device-grid,.learn-grid{grid-template-columns:1fr 1fr}.home-actions{grid-template-columns:1fr 1fr}.main{padding:20px 16px 100px}.topbar{padding:0 16px}}
@media(max-width:640px){.shell{grid-template-rows:64px 1fr 72px}.topbar{height:64px}.brand{font-size:19px}.top-actions .label{display:none}.home-grid{display:flex;flex-direction:column-reverse;gap:18px}.companion-panel{padding:18px}.avatar-wrap{width:210px;height:210px}.companion-stage{min-height:auto}.welcome h1{font-size:34px}.welcome p{font-size:17px}.home-actions{grid-template-columns:1fr}.action{min-height:auto}.help-layout{height:calc(100vh - 156px)}.messages{padding:15px}.bubble{max-width:88%}.composer{padding:10px}.send{padding:0 14px}.device-grid,.learn-grid,.avatar-grid{grid-template-columns:1fr 1fr}.main{padding-top:14px}.primary-card{padding:22px}}
.home-chat{margin-top:20px;padding-top:18px;border-top:1px solid var(--line);text-align:left}.home-chat label{display:block;font-weight:800;font-size:18px;margin-bottom:10px}.home-composer{display:flex;gap:8px}.home-composer input{flex:1;min-width:0;border:1px solid var(--line);border-radius:14px;padding:14px;font-size:16px}.example{font-size:13px;color:var(--muted);margin-top:8px}.embedded-section{margin-top:22px;border-top:1px solid var(--line);padding-top:22px;display:flex;align-items:center;justify-content:space-between;gap:18px}.embedded-section h2{margin:0 0 6px}.embedded-section p{margin:0;color:var(--muted)}.learn-intro{background:var(--soft);border:1px solid #d6e6ff;border-radius:20px;padding:24px;margin-bottom:20px}.learn-intro h2{margin:0 0 8px}.learn-intro p{color:var(--muted);max-width:700px}.learn-grid.compact .lesson{min-height:180px}.avatar-choice{padding:10px}.avatar-main{border:0;background:transparent;width:100%;padding:0;color:var(--ink)}.avatar-main span{display:block;color:var(--muted);font-size:12px;margin-top:4px}.voice-preview{margin-top:9px;border:1px solid var(--line);background:#fff;color:var(--blue);border-radius:10px;padding:8px;width:100%;font-weight:800}.modal-card.small{width:min(520px,100%)}.modal-input{width:100%;border:1px solid var(--line);border-radius:13px;padding:13px;font-size:16px;margin:14px 0}.modal-input.tall{min-height:130px;resize:vertical}.full{width:100%}
@media(max-width:640px){.embedded-section{align-items:flex-start;flex-direction:column}.home-composer .send{padding:0 12px}.home-chat{margin-top:16px}.companion-panel{width:100%}}
/* V6.3 refinements */
.brand>span{color:#7d8da5;font-weight:600}.ready{color:#27865d;font-size:13px}.companion-panel .change{display:none}.bottom-nav{height:64px}.shell{grid-template-rows:72px 1fr 64px}.bottom-nav .nav-icon{font-size:18px;margin-bottom:2px}.bottom-nav button{font-size:11px}.home-grid{align-items:start}.welcome{padding-top:12px}.companion-stage{padding-top:46px;align-items:flex-start}.device-actions{margin-top:14px}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:20px 0}.detail-item{border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:6px}.detail-item span{color:var(--muted)}.detail-help{background:var(--soft);border:1px solid #d6e6ff;border-radius:16px;padding:18px}.detail-help h3{margin:0 0 6px}.detail-help p{margin:0;color:var(--muted)}.modal-actions{display:flex;gap:10px;margin-top:18px}.settings-list{display:grid;gap:12px;margin:18px 0}.setting-row,.setting-block,.toggle-row{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:15px;display:flex;align-items:center;justify-content:space-between;text-align:left}.setting-row span,.toggle-row span{display:flex;flex-direction:column;gap:4px}.setting-row small,.toggle-row small{color:var(--muted)}.setting-block{display:grid;gap:10px}.setting-block select{border:1px solid var(--line);border-radius:10px;padding:10px;background:#fff}.toggle-row input{width:22px;height:22px}.tour p{padding:12px;border-bottom:1px solid var(--line)}
@media(max-width:640px){.shell{grid-template-rows:64px 1fr 60px}.bottom-nav{height:60px}.bottom-nav .nav-icon{font-size:17px}.bottom-nav button{font-size:10px}.home-grid{display:flex;flex-direction:column}.welcome{order:1;width:100%;padding-top:0}.companion-stage{order:2;padding-top:0;width:100%}.detail-grid{grid-template-columns:1fr}.modal-actions{flex-direction:column}}