@import "https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500&family=Noto+Serif+HK:wght@500;600;700&family=Work+Sans:wght@400;500;600;700&display=swap";:root{--background:oklch(97% .012 75);--foreground:oklch(20% .02 40);--card:oklch(98% .01 75);--card-foreground:oklch(20% .02 40);--popover:oklch(98% .01 75);--popover-foreground:oklch(20% .02 40);--primary:oklch(51% .16 25);--primary-foreground:oklch(98% .01 75);--secondary:oklch(42% .08 165);--secondary-foreground:oklch(98% .01 75);--muted:oklch(93% .015 70);--muted-foreground:oklch(45% .02 50);--accent:oklch(76% .13 80);--accent-foreground:oklch(25% .03 60);--destructive:oklch(62.8% .258 29.23);--destructive-foreground:oklch(98% 0 0);--border:oklch(88% .02 60);--input:oklch(88% .02 60);--ring:oklch(51% .16 25);--font-sans:"Work Sans", "Noto Serif HK", sans-serif;--font-mono:"JetBrains Mono", monospace;--font-heading:"Noto Serif HK", serif;--radius:.625rem}.dark{--background:oklch(13% .015 45);--foreground:oklch(95% .01 70);--card:oklch(16% .018 45);--card-foreground:oklch(95% .01 70);--popover:oklch(16% .018 45);--popover-foreground:oklch(95% .01 70);--primary:oklch(62% .17 25);--primary-foreground:oklch(13% .015 45);--secondary:oklch(50% .09 165);--secondary-foreground:oklch(95% .01 70);--muted:oklch(22% .02 45);--muted-foreground:oklch(70% .02 60);--accent:oklch(78% .14 80);--accent-foreground:oklch(16% .02 45);--destructive:oklch(62.8% .258 29.23);--destructive-foreground:oklch(98% 0 0);--border:oklch(28% .02 45);--input:oklch(28% .02 45);--ring:oklch(62% .17 25)}*{box-sizing:border-box}body{background:var(--background);color:var(--foreground);font-family:var(--font-sans);margin:0;font-size:15px}button,textarea{font:inherit}button{color:inherit}.app-shell{background:var(--background);grid-template-columns:230px minmax(420px,1fr) 310px;height:100vh;display:grid;overflow:hidden}.sidebar{background:var(--card);border-right:1px solid var(--border);z-index:20;flex-direction:column;padding:22px 16px;display:flex}.brand{align-items:center;gap:10px;margin:0 8px 28px;font-size:14px;line-height:1.15;display:flex}.brand img{border-radius:10px;width:42px;height:42px}.brand strong{font-family:var(--font-heading);font-size:18px}.new-chat{background:var(--primary);color:var(--primary-foreground);cursor:pointer;box-shadow:0 4px 12px color-mix(in oklab,var(--primary) 22%,transparent);border:0;border-radius:9px;justify-content:center;align-items:center;gap:8px;padding:12px;font-weight:600;display:flex}nav{gap:6px;margin-top:22px;display:grid}.nav-item{color:var(--muted-foreground);cursor:pointer;text-align:left;background:0 0;border:1px solid #0000;border-radius:9px;align-items:center;gap:11px;padding:11px 12px;display:flex}.nav-item svg{width:18px}.nav-item:hover,.nav-item.active{background:var(--muted);color:var(--foreground)}.nav-item.active{border-color:var(--border);font-weight:600}.tone-card{background:color-mix(in oklab,var(--accent) 13%,var(--card));border:1px solid color-mix(in oklab,var(--accent) 40%,var(--border));border-radius:12px;gap:5px;margin-top:auto;padding:15px;display:grid}.eyebrow{letter-spacing:.1em;color:var(--primary);font-size:10px;font-weight:700}.tone-mark{color:var(--accent);font-size:28px;line-height:1}.tone-card small{color:var(--muted-foreground);line-height:1.4}.tone-card b{font-family:var(--font-mono);color:var(--primary)}.chat-column{background:linear-gradient(color-mix(in oklab,var(--background) 93%,transparent),color-mix(in oklab,var(--background) 93%,transparent)),repeating-linear-gradient(0deg,transparent,transparent 31px,var(--border) 32px);grid-template-rows:68px minmax(0,1fr) auto;min-width:0;display:grid}.topbar{background:color-mix(in oklab,var(--card) 92%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);z-index:5;justify-content:space-between;align-items:center;padding:0 24px;display:flex}.lesson{align-items:center;gap:11px;display:flex}.lesson div{display:grid}.lesson small{color:var(--muted-foreground);margin-top:2px;font-size:12px}.status-dot{background:var(--secondary);width:9px;height:9px;box-shadow:0 0 0 4px color-mix(in oklab,var(--secondary) 15%,transparent);border-radius:50%}.icon-button{border:1px solid var(--border);background:var(--card);cursor:pointer;border-radius:50%;place-items:center;width:39px;height:39px;display:grid}.icon-button svg{width:18px}.mobile-brand{display:none}.messages{scrollbar-width:thin;padding:26px clamp(20px,5vw,72px) 30px;overflow-y:auto}.day-label{text-align:center;color:var(--muted-foreground);letter-spacing:.12em;margin:0 0 26px;font-size:10px;font-weight:700}.message-row{align-items:flex-start;gap:11px;margin:0 0 24px;animation:.3s both arrive;display:flex}.bot-avatar,.user-avatar{border-radius:50%;flex:0 0 34px;width:34px;height:34px}.bot-avatar{object-fit:cover;border:1px solid var(--border)}.user-avatar{background:var(--primary);color:var(--primary-foreground);place-items:center;font-size:10px;font-weight:700;display:grid}.assistant-wrap{max-width:min(520px,80%)}.assistant-bubble{background:var(--card);border:1px solid var(--border);box-shadow:0 8px 25px color-mix(in oklab,var(--foreground) 5%,transparent);border-radius:5px 15px 15px;padding:17px 50px 17px 19px;position:relative}.chinese{font-family:var(--font-heading);margin:0 0 5px;font-size:23px;font-weight:600}.jyutping{font-family:var(--font-mono);color:var(--accent-foreground);margin:0;font-size:12px;line-height:1.6}.tone-1{color:#c8383a}.tone-2{color:#d86732}.tone-3{color:#b98b2d}.tone-4{color:#748b3a}.tone-5{color:#3c8260}.tone-6{color:#1f6f5c}.dark .tone-1{color:#ff7275}.dark .tone-2{color:#f69459}.dark .tone-3{color:#e8b23b}.dark .tone-4{color:#b3c75a}.dark .tone-5{color:#61b98c}.dark .tone-6{color:#55a994}.french{border-top:1px solid var(--border);color:var(--muted-foreground);margin:10px 0 0;padding-top:10px;font-style:italic;line-height:1.45}.speak{background:var(--muted);width:32px;height:32px;color:var(--secondary);cursor:pointer;border:0;border-radius:50%;place-items:center;display:grid;position:absolute;top:13px;right:13px}.coach-note{color:var(--secondary);align-items:center;gap:7px;margin:8px 6px 0;font-size:12px;display:flex}.user-row{justify-content:flex-end}.user-bubble{background:color-mix(in oklab,var(--primary) 14%,var(--card));border:1px solid color-mix(in oklab,var(--primary) 38%,var(--border));border-radius:15px 5px 15px 15px;max-width:70%;padding:13px 16px;line-height:1.45}.starters{flex-wrap:wrap;gap:8px;margin:0 0 10px 45px;display:flex}.starters button{border:1px solid var(--border);background:var(--card);color:var(--muted-foreground);cursor:pointer;border-radius:999px;align-items:center;gap:5px;padding:9px 11px;display:flex}.typing{background:var(--card);border:1px solid var(--border);color:var(--muted-foreground);border-radius:5px 15px 15px;align-items:center;gap:5px;padding:13px 16px;font-size:12px;display:flex}.typing i{background:var(--secondary);border-radius:50%;width:6px;height:6px;animation:1s infinite bounce}.typing i:nth-child(2){animation-delay:.12s}.typing i:nth-child(3){animation-delay:.24s}.typing span{margin-left:5px}.composer-area{background:linear-gradient(transparent,var(--background) 18%);padding:10px clamp(20px,5vw,72px) 14px}.mode-hint{color:var(--muted-foreground);align-items:center;gap:6px;margin:0 0 7px 3px;font-size:11px;display:flex}.composer{background:var(--card);border:1px solid var(--input);box-shadow:0 8px 30px color-mix(in oklab,var(--foreground) 8%,transparent);border-radius:14px;align-items:flex-end;gap:10px;padding:8px 8px 8px 14px;display:flex}.composer:focus-within{border-color:var(--ring);box-shadow:0 0 0 3px color-mix(in oklab,var(--ring) 15%,transparent)}.composer textarea{resize:none;min-height:38px;max-height:100px;color:var(--foreground);background:0 0;border:0;outline:0;flex:1;padding:9px 0}.composer button{cursor:pointer;border:0;border-radius:10px;flex:0 0 40px;place-items:center;width:40px;height:40px;display:grid}.composer .send-button{background:var(--primary);color:var(--primary-foreground)}.composer .mic-button{background:var(--muted);color:var(--secondary);border:1px solid var(--border)}.composer .mic-button[aria-pressed=true]{background:var(--primary);color:var(--primary-foreground);border-color:var(--primary);animation:1.2s ease-in-out infinite mic-pulse}.composer.is-listening{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in oklab,var(--primary) 18%,transparent)}.composer button:disabled{opacity:.35;cursor:not-allowed}.privacy{text-align:center;color:var(--muted-foreground);margin-top:7px;font-size:10px;display:block}.learning-panel{border-left:1px solid var(--border);background:var(--card);padding:24px 20px;overflow-y:auto}.progress-block{border-bottom:1px solid var(--border);padding-bottom:20px}.progress-head{justify-content:space-between;margin-bottom:9px;font-size:12px;display:flex}.progress-head span{color:var(--muted-foreground)}.progress{background:var(--muted);border-radius:99px;height:6px;overflow:hidden}.progress span{background:var(--secondary);border-radius:inherit;height:100%;transition:width .3s;display:block}.segmented{background:var(--muted);border-radius:9px;grid-template-columns:1fr 1fr;margin:20px 0;padding:3px}.segmented button{cursor:pointer;background:0 0;border:0;border-radius:7px;padding:8px;font-size:12px}.segmented .selected{background:var(--card);box-shadow:0 1px 5px color-mix(in oklab,var(--foreground) 10%,transparent);font-weight:600}.panel-title{justify-content:space-between;align-items:center;display:flex}.panel-title h2{font-family:var(--font-heading);font-size:17px}.panel-title span{background:var(--muted);border-radius:99px;padding:3px 8px;font-size:11px}.learned-list{gap:8px;display:grid}.learned-list>button{text-align:left;border:1px solid var(--border);background:var(--background);cursor:pointer;border-radius:10px;justify-content:space-between;align-items:center;width:100%;padding:11px;display:flex}.learned-list strong{font-family:var(--font-heading);font-size:16px}.learned-list svg{color:var(--secondary)}.empty-card{text-align:center;border:1px dashed var(--border);color:var(--muted-foreground);border-radius:12px;padding:26px 14px}.empty-icon{font-family:var(--font-heading);color:var(--primary);margin-bottom:8px;font-size:30px}.empty-card strong{color:var(--foreground);display:block}.empty-card p{font-size:12px;line-height:1.5}.tip{background:color-mix(in oklab,var(--secondary) 10%,var(--card));border:1px solid color-mix(in oklab,var(--secondary) 30%,var(--border));border-radius:10px;gap:10px;margin-top:20px;padding:13px;display:flex}.tip svg{color:var(--secondary);flex:none}.tip p{color:var(--muted-foreground);margin:4px 0 0;font-size:12px;line-height:1.45}.bottom-nav{display:none}.toast{z-index:50;background:var(--foreground);color:var(--background);border-radius:10px;align-items:center;gap:15px;padding:11px 12px 11px 16px;animation:.2s toast;display:flex;position:fixed;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 10px 35px #0003}.toast button{color:inherit;cursor:pointer;background:0 0;border:0;place-items:center;display:grid}button:not(:disabled):hover{filter:brightness(.97);transform:translateY(-1px)}button:not(:disabled):active{transform:translateY(0)}button:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in oklab,var(--ring) 40%,transparent);outline-offset:2px}@keyframes arrive{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@keyframes bounce{50%{transform:translateY(-3px)}}@keyframes mic-pulse{50%{box-shadow:0 0 0 7px color-mix(in oklab,var(--primary) 18%,transparent)}}@keyframes toast{0%{opacity:0;transform:translate(-50%,8px)}}.backdrop{display:none}@media (width<=1050px){.app-shell{grid-template-columns:210px 1fr}.learning-panel{display:none}}@media (width<=700px){.app-shell{grid-template-columns:1fr;height:100dvh}.sidebar{width:270px;transition:transform .2s;position:fixed;inset:0 auto 0 0;transform:translate(-100%)}.sidebar.open{transform:none;box-shadow:20px 0 50px #0004}.backdrop{z-index:15;background:#0005;border:0;display:block;position:fixed;inset:0}.chat-column{grid-template-rows:58px minmax(0,1fr) auto}.topbar{padding:0 14px}.lesson{display:none}.mobile-brand{cursor:pointer;background:0 0;border:0;align-items:center;gap:9px;padding:0;font-weight:700;display:flex}.mobile-brand img{border-radius:8px;width:34px;height:34px}.messages{padding:20px 13px 25px}.assistant-wrap{max-width:calc(100% - 46px)}.user-bubble{max-width:78%}.composer-area{padding:8px 12px 72px}.privacy{display:none}.starters{margin-left:45px;display:grid}.starters button{justify-content:space-between}.bottom-nav{background:color-mix(in oklab,var(--card) 96%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border);z-index:10;grid-template-columns:repeat(3,1fr);height:58px;margin:0;display:grid;position:fixed;bottom:0;left:0;right:0}.bottom-nav button{color:var(--muted-foreground);background:0 0;border:0;align-content:center;place-items:center;gap:2px;font-size:10px;display:grid}.bottom-nav svg{width:18px}.bottom-nav .active{color:var(--primary);border-top:2px solid var(--primary);font-weight:700}.toast{width:max-content;max-width:90%;bottom:70px}.chinese{font-size:21px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}