/* 小C — the AI helper who lives in the homepage header (see assets/hc-assistant.js).
   The chat is a comic panel that drops from 小C like a speech balloon; the page stays visible and scrollable.
   Palette C: ink #111819, paper #FBFAF6, Tiffany #00D9BA, coral #FF7A6B, chat #E6ECEA. */
:root{--hca-ink:#111819;--hca-paper:#FBFAF6;--hca-tif:#00D9BA;--hca-coral:#FF7A6B;--hca-soft:#465450}

/* ---------- Header track: the strip between the logo and the nav/menu ---------- */
.hca-track{position:absolute;bottom:0;height:64px;pointer-events:none;z-index:1}
.hca-buddy{position:absolute;left:0;bottom:-3px;width:52px;height:60px;padding:0;margin:0;border:0;background:none;cursor:pointer;pointer-events:auto;
  transform:translateX(var(--hca-x,0px));transition-property:transform;transition-timing-function:linear;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
.hca-buddy:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px;border-radius:4px}
.hca-svg{display:block;width:100%;height:100%;overflow:visible;transition:transform .18s}
.hca-buddy.face-left .hca-svg{transform:scaleX(-1)}
html[data-view="desktop"] .hca-buddy{width:58px;height:66px;bottom:-4px}
body.menu-open .hca-track,body.lit .hca-track{visibility:hidden}

/* drawing */
.hca-svg .ink{fill:none;stroke:var(--hca-ink);stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.hca-shell{fill:var(--hca-tif);stroke:var(--hca-ink);stroke-width:2.6;stroke-linejoin:round}
.hca-nub{fill:var(--hca-tif);stroke:var(--hca-ink);stroke-width:2.4}
.hca-foot,.hca-eye,.hca-fill,.hca-cup{fill:var(--hca-ink)}
.hca-shine{fill:#fff}
.hca-cheek{fill:#FFA3B5}
.hca-tongue,.hca-nose{fill:var(--hca-coral)}
.hca-gloss{fill:none;stroke:#fff;stroke-width:2.4;stroke-linecap:round;opacity:.75}
.hca-belly{fill:#E4FFF8}
.hca-leaf{fill:#8EF0D6;stroke:var(--hca-ink);stroke-width:2;stroke-linejoin:round}
.hca-earin{fill:#FFB4A9}
.hca-whisker{fill:none;stroke:var(--hca-ink);stroke-width:1.5;stroke-linecap:round;opacity:.5}
.hca-bulb{fill:var(--hca-coral);stroke:var(--hca-ink);stroke-width:2}
.hca-shadow{fill:var(--hca-ink);opacity:.14}
.hca-mouth-open{fill:var(--hca-ink);opacity:0}
.hca-closed{opacity:0}
.hca-z{font:700 var(--fs-xs)/1 "Noto Sans TC",sans-serif;fill:var(--hca-ink);opacity:0}
.hca-ball{fill:var(--hca-coral);stroke:var(--hca-ink);stroke-width:2;opacity:0}

/* pivots */
.hca-rig,.hca-eyes,.hca-arm-l,.hca-arm-r,.hca-leg-l,.hca-leg-r,.hca-mouth-open,.hca-ball,.hca-bulb{transform-box:fill-box}
.hca-rig{transform-origin:50% 100%;animation:hca-breathe 2.8s ease-in-out infinite}
.hca-eyes{transform-origin:50% 50%;animation:hca-blink 5.2s infinite;transition:translate .25s}
.hca-arm-l{transform-origin:100% 20%}
.hca-arm-r{transform-origin:0% 20%}
.hca-mouth-open{transform-origin:50% 50%}
.hca-bulb{transform-origin:50% 100%;animation:hca-glow 3.6s ease-in-out infinite}

@keyframes hca-breathe{0%,100%{transform:translateY(0) scale(1,1)}50%{transform:translateY(-1px) scale(1.02,.98)}}
@keyframes hca-blink{0%,93%,100%{transform:scaleY(1)}95%{transform:scaleY(.08)}97%{transform:scaleY(1)}}
@keyframes hca-glow{0%,100%{transform:rotate(0) scale(1)}50%{transform:rotate(-8deg) scale(1.1)}}
@keyframes hca-step{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@keyframes hca-trot{0%,100%{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-2.5px) rotate(2deg)}}
@keyframes hca-wave{0%,100%{transform:rotate(-70deg)}50%{transform:rotate(-25deg)}}
@keyframes hca-hop{0%,100%{transform:translateY(0) scale(1,1)}15%{transform:translateY(0) scale(1.1,.88)}50%{transform:translateY(-16px) scale(.95,1.06)}85%{transform:translateY(0) scale(1.07,.93)}}
@keyframes hca-wiggle{0%,100%{transform:rotate(0)}25%{transform:rotate(-9deg)}75%{transform:rotate(9deg)}}
@keyframes hca-toss{0%,100%{transform:translateY(0);opacity:1}50%{transform:translateY(-20px);opacity:1}}
@keyframes hca-paw{0%,100%{transform:rotate(0)}50%{transform:rotate(-40deg)}}
@keyframes hca-zz{0%{transform:translate(0,0);opacity:0}30%{opacity:1}100%{transform:translate(8px,-16px);opacity:0}}
@keyframes hca-talk{0%,100%{transform:scaleY(.3)}50%{transform:scaleY(1)}}

.hca-buddy.is-walking .hca-rig{animation:hca-trot .36s ease-in-out infinite}
.hca-buddy.is-walking .hca-leg-l{animation:hca-step .36s ease-in-out infinite}
.hca-buddy.is-walking .hca-leg-r{animation:hca-step .36s ease-in-out -.18s infinite}
.hca-buddy.is-wave .hca-arm-r{animation:hca-wave .42s ease-in-out infinite}
.hca-buddy.is-hop .hca-rig{animation:hca-hop .5s cubic-bezier(.3,.7,.4,1) 1}
.hca-buddy.is-dance .hca-rig{animation:hca-wiggle .32s ease-in-out 4}
.hca-buddy.is-dance .hca-arm-l,.hca-buddy.is-dance .hca-arm-r{animation:hca-paw .32s ease-in-out 4}
.hca-buddy.is-ball .hca-ball{animation:hca-toss .62s cubic-bezier(.3,.6,.5,1) 3;opacity:1}
.hca-buddy.is-ball .hca-arm-r{animation:hca-paw .62s ease-in-out 3}
.hca-buddy.look-up .hca-eyes{translate:0 -2px}
.hca-buddy.look-down .hca-eyes{translate:0 2px}
.hca-buddy.look-left .hca-eyes{translate:-2.5px 0}
.hca-buddy.look-right .hca-eyes{translate:2.5px 0}
.hca-buddy.is-sleep .hca-eyes{opacity:0;animation:none}
.hca-buddy.is-sleep .hca-closed{opacity:1}
.hca-buddy.is-sleep .hca-rig{animation-duration:4.4s}
.hca-buddy.is-sleep .hca-z{animation:hca-zz 2.2s ease-out infinite}
.hca-buddy.is-sleep .hca-z.z2{animation-delay:1.1s}
.hca-buddy.is-talk .hca-mouth-open{opacity:1;animation:hca-talk .22s ease-in-out infinite}
.hca-buddy.is-talk .hca-mouth{opacity:0}

/* speech tip under the header */
.hca-tip{position:absolute;top:calc(100% + 10px);left:0;width:max-content;max-width:min(280px,calc(100vw - 24px));box-sizing:border-box;padding:0;background:var(--hca-paper);color:var(--hca-ink);border:2.5px solid var(--hca-ink);border-radius:4px;
  box-shadow:3px 3px 0 var(--hca-ink);font-size:var(--fs-sm);font-weight:700;line-height:1.45;white-space:normal;pointer-events:auto;display:grid;grid-template-columns:minmax(0,1fr) 44px;align-items:start;
  opacity:0;transform:translateY(-6px) scale(.96);transform-origin:var(--hca-tail,24px) 0;transition:opacity .2s,transform .2s;visibility:hidden}
.hca-tip::before{content:"";position:absolute;top:-9px;left:calc(var(--hca-tail,24px) - 8px);width:14px;height:14px;background:var(--hca-paper);border-left:2.5px solid var(--hca-ink);border-top:2.5px solid var(--hca-ink);transform:rotate(45deg);border-top-left-radius:0}
.hca-tip.is-on{opacity:1;transform:none;visibility:visible}
.hca-tip-chat,.hca-tip-close{position:relative;border:0;background:none;color:inherit;font:inherit;cursor:pointer;touch-action:manipulation}
.hca-tip-chat{min-width:0;padding:12px 0 8px 12px;text-align:left;line-height:1.5;overflow-wrap:anywhere;border-radius:4px}
.hca-tip-close{grid-column:2;grid-row:1;min-width:44px;min-height:44px;padding:4px;font-size:var(--fs-xl);line-height:1;border-radius:4px}
.hca-tip-chat:focus-visible,.hca-tip-close:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}
.hca-tip-voice{grid-column:1 / -1;justify-self:start;margin:0 10px 8px 12px}
.hca-tip-voice,.hca-tools button{min-height:44px;padding:6px 10px;border:2px solid var(--hca-ink);border-radius:4px;background:var(--hca-tif);color:var(--hca-ink);font:700 var(--fs-sm)/1.4 system-ui,sans-serif;cursor:pointer;touch-action:manipulation}
.hca-tip-voice:disabled,.hca-tools button:disabled{background:#d7dfdc;cursor:default}
.hca-tip-voice:focus-visible,.hca-tools button:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}
.hca-tools{display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:0 12px 8px;flex:none}
.hca-voice-note{flex-basis:100%;font-size:var(--fs-xs);line-height:1.4;color:var(--hca-soft)}

/* ---------- Comic chat panel ---------- */
.hca-panel{position:fixed;z-index:95;top:calc(var(--hca-vt,0px) + var(--hca-top,76px) + 14px);left:10px;right:10px;
  max-height:min(54vh,calc(var(--hca-vh,100vh) - var(--hca-top,76px) - 30px));display:flex;flex-direction:column;
  color:var(--hca-ink);font-size:var(--fs-base);line-height:1.6;
  opacity:0;transform:translateY(-10px) scale(.94);transform-origin:var(--hca-tx,50%) 0;transition:opacity .16s ease-out,transform .24s cubic-bezier(.2,.9,.3,1.25)}
.hca-panel[hidden]{display:none}
.hca-panel.is-open{opacity:1;transform:none}
html[data-view="desktop"] .hca-panel{right:auto;left:var(--hca-left,auto);width:min(392px,calc(100vw - 40px));max-height:min(600px,calc(100vh - var(--hca-top,86px) - 34px))}
.hca-frame{position:relative;display:flex;flex-direction:column;min-height:0;max-height:inherit;flex:1 1 auto;
  background-color:var(--hca-paper);background-image:radial-gradient(rgba(17,24,25,.07) 1px,transparent 1.3px);background-size:9px 9px;
  border:3px solid var(--hca-ink);border-radius:4px;box-shadow:5px 5px 0 var(--hca-ink);overflow-y:auto;overscroll-behavior:contain}
/* the balloon tail points up at 小C in the header */
.hca-panel::before,.hca-panel::after{content:"";position:absolute;z-index:1;left:calc(var(--hca-tx,50%) - 12px);width:0;height:0;border-style:solid;pointer-events:none}
.hca-panel::before{top:-19px;border-width:0 12px 19px;border-color:transparent transparent var(--hca-ink)}
.hca-panel::after{top:-13.5px;left:calc(var(--hca-tx,50%) - 8.5px);border-width:0 8.5px 14px;border-color:transparent transparent var(--hca-paper)}
/* Landscape phones: use the whole visible height; if it still doesn't fit, the panel scrolls instead of spilling. */
@media (max-height:500px){.hca-panel{max-height:calc(var(--hca-vh,100vh) - var(--hca-top,76px) - 18px)}.hca-log{min-height:56px}}

.hca-top{display:flex;align-items:center;gap:8px;padding:8px 8px 0 12px;flex:none}
.hca-cap{margin:0;display:inline-flex;align-items:baseline;gap:8px;padding:3px 10px 4px;background:var(--hca-tif);border:2.5px solid var(--hca-ink);border-radius:4px;transform:rotate(-2deg);
  font-size:var(--fs-base);line-height:1.3;font-weight:800;letter-spacing:.04em;color:var(--hca-ink);outline:none;box-shadow:2px 2px 0 var(--hca-ink)}
.hca-cap span{font-size:var(--fs-xs);font-weight:700;letter-spacing:0}
.hca-cap:focus-visible{outline:3px solid var(--hca-ink);outline-offset:3px}
.hca-close{margin-left:auto;flex:none;width:44px;height:44px;display:grid;place-items:center;border:2.5px solid var(--hca-ink);border-radius:999px;background:var(--hca-paper);color:var(--hca-ink);cursor:pointer;box-shadow:2px 2px 0 var(--hca-ink)}
.hca-close svg{width:18px;height:18px;stroke:currentColor;stroke-width:3;stroke-linecap:round;fill:none}
.hca-close:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}

.hca-log{flex:1 1 auto;min-height:72px;overflow-y:auto;overscroll-behavior:contain;display:flex;flex-direction:column;gap:14px;padding:12px 14px 8px;-webkit-overflow-scrolling:touch}
.hca-log{-webkit-mask-image:linear-gradient(to bottom,transparent 0,#000 16px,#000 calc(100% - 6px),transparent 100%);mask-image:linear-gradient(to bottom,transparent 0,#000 16px,#000 calc(100% - 6px),transparent 100%)}
.hca-log>:first-child{margin-top:12px}
.hca-panel .hca-log:focus-visible{outline:3px solid var(--hca-ink)!important;outline-offset:-6px!important;border-radius:4px}
.hca-msg{position:relative;max-width:88%;padding:9px 14px;border:2.5px solid var(--hca-ink);white-space:pre-wrap;overflow-wrap:anywhere;font-weight:500}
.hca-msg.bot{align-self:flex-start;background:#fff;border-radius:4px;margin-top:6px;transform:rotate(-.4deg)}
.hca-msg.me{align-self:flex-end;background:var(--hca-tif);border-radius:4px;margin-bottom:8px;transform:rotate(.5deg)}
/* balloon tails: 小C's point up-left towards him, yours point down-right towards you */
.hca-msg.bot::before,.hca-msg.bot::after,.hca-msg.me::before,.hca-msg.me::after{content:"";position:absolute;width:0;height:0;border-style:solid}
.hca-msg.bot::before{left:16px;top:-14px;border-width:0 0 14px 14px;border-color:transparent transparent var(--hca-ink) transparent}
.hca-msg.bot::after{left:19px;top:-8.5px;border-width:0 0 10px 9px;border-color:transparent transparent #fff transparent}
.hca-msg.me::before{right:18px;bottom:-14px;border-width:14px 14px 0 0;border-color:var(--hca-ink) transparent transparent transparent}
.hca-msg.me::after{right:21px;bottom:-8.5px;border-width:10px 9px 0 0;border-color:var(--hca-tif) transparent transparent transparent}
.hca-msg a{color:inherit;font-weight:700;text-decoration:underline;text-underline-offset:2px}
.hca-msg.is-thinking{background:#fff;border-radius:999px;padding:8px 16px}
.hca-msg.is-thinking::before{left:10px;top:-12px;width:10px;height:10px;border:2.5px solid var(--hca-ink);border-radius:999px;background:#fff}
.hca-msg.is-thinking::after{left:4px;top:-22px;width:6px;height:6px;border:2px solid var(--hca-ink);border-radius:999px;background:#fff}
.hca-typing{display:inline-flex;gap:5px;padding:4px 0}
.hca-typing i{width:7px;height:7px;border-radius:999px;background:var(--hca-ink);animation:hca-dot 1s ease-in-out infinite}
.hca-typing i:nth-child(2){animation-delay:.15s}.hca-typing i:nth-child(3){animation-delay:.3s}
@keyframes hca-dot{0%,60%,100%{transform:translateY(0);opacity:.35}30%{transform:translateY(-4px);opacity:1}}

.hca-chips{display:flex;flex-wrap:nowrap;gap:8px;padding:4px 12px 8px;flex:none;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none;-webkit-overflow-scrolling:touch}
.hca-chips::-webkit-scrollbar{display:none}
.hca-chips[hidden]{display:none}
.hca-chip{flex:none;white-space:nowrap;min-height:44px;padding:5px 12px;border:2px solid var(--hca-ink);border-radius:4px;background:#fff;color:var(--hca-ink);font:inherit;font-size:var(--fs-sm);font-weight:700;line-height:1.35;cursor:pointer;box-shadow:2px 2px 0 var(--hca-ink)}
.hca-chip:nth-child(odd){transform:rotate(-1deg)}.hca-chip:nth-child(even){transform:rotate(1deg)}
.hca-chip:active{box-shadow:none;translate:2px 2px}
.hca-chip:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}

.hca-form{display:flex;align-items:flex-end;gap:8px;padding:6px 10px 4px 12px;flex:none}
.hca-input{flex:1;min-width:0;min-height:44px;max-height:104px;resize:none;margin:0;padding:10px 14px;border:2.5px solid var(--hca-ink)!important;border-radius:4px;background:#fff;color:var(--hca-ink);font:inherit;font-size:var(--fs-base);line-height:1.45;box-shadow:none!important;-webkit-appearance:none;appearance:none}
.hca-input::placeholder{color:#6b7773}
.hca-panel .hca-input:focus-visible{outline:3px solid var(--hca-ink)!important;outline-offset:-1px!important;box-shadow:0 0 0 4px rgba(0,217,186,.55)!important}
.hca-send{flex:none;width:44px;height:44px;display:grid;place-items:center;border:2.5px solid var(--hca-ink);border-radius:999px;background:var(--hca-tif);color:var(--hca-ink);cursor:pointer;box-shadow:2px 2px 0 var(--hca-ink)}
.hca-send svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.hca-send:disabled{background:#d7dfdc;cursor:default;box-shadow:none}
.hca-send:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}
.hca-bottom{display:flex;align-items:center;gap:10px;padding:2px 12px 9px;flex:none}
.hca-human{flex:none;display:inline-flex;align-items:center;min-height:44px;padding:0 11px;border:2px solid var(--hca-ink);border-radius:999px;background:var(--hca-tif);color:var(--hca-ink)!important;font-size:var(--fs-sm);font-weight:800;text-decoration:none!important;white-space:nowrap}
.hca-human:focus-visible{outline:3px solid var(--hca-ink);outline-offset:2px}
.hca-foot{margin:0;min-width:0;font-size:var(--fs-xs);line-height:1.45;color:var(--hca-soft)}
.hca-foot a{color:var(--hca-soft);text-decoration:underline}

html.hca-motion-off :is(.hca-rig,.hca-eyes,.hca-bulb,.hca-leg-l,.hca-leg-r,.hca-arm-r,.hca-arm-l,.hca-ball,.hca-mouth-open,.hca-typing i){animation:none!important}
html.hca-motion-off .hca-buddy{transition:none}
@media (prefers-reduced-motion:reduce){
  html:not(.hca-motion-on) :is(.hca-rig,.hca-eyes,.hca-bulb,.hca-leg-l,.hca-leg-r,.hca-arm-r,.hca-arm-l,.hca-ball,.hca-mouth-open,.hca-typing i){animation:none!important}
  html:not(.hca-motion-on) .hca-buddy{transition:none}
  .hca-buddy.is-sleep .hca-z{animation:none;opacity:1}
  .hca-panel{transform:none;transition:opacity .15s}
  .hca-tip{transform:none;transition:opacity .2s}
}