/* === Reset === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;-webkit-tap-highlight-color:transparent}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",system-ui,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;display:flex;flex-direction:column;height:100vh;height:100dvh;position:fixed;inset:0;overflow:hidden}

/* === Light (Morandi Purple) === */
:root{--primary:#8B7EC8;--primary-light:#EDE8F8;--primary-mid:#C5BAE0;--primary-gradient:linear-gradient(135deg,#8B7EC8,#A195D2);--surface:#FFFFFF;--bg:#F7F5FC;--text:#1C1833;--text2:#5C5278;--text3:#9890AC;--line:#E2DCF0;--radius:12px;--radius-lg:16px;--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--shadow-sm:0 1px 3px rgba(92,82,120,.08);--shadow-md:0 4px 14px rgba(92,82,120,.1);--glow-purple:rgba(139,126,200,.2)}

/* === Dark (Deep Purple) === */
@media(prefers-color-scheme:dark){
:root{--primary:#B8ADDC;--primary-light:#2D2547;--primary-mid:#7C6FAF;--primary-gradient:linear-gradient(135deg,#7C6FAF,#B8ADDC);--surface:#1C1730;--bg:#120E22;--text:#EEEBFF;--text2:#A89DC4;--text3:#716A8A;--line:#2D2547;--shadow-sm:0 1px 3px rgba(0,0,0,.3);--shadow-md:0 4px 14px rgba(0,0,0,.4);--glow-purple:rgba(139,126,200,.12)}
}

/* === Error Banner === */
.err{flex-shrink:0;font-size:13px;padding:10px 16px;text-align:center;display:none;animation:erIn .25s}
.err.show{display:block}
.err.e{background:#FCEBEB;color:#A32D2D}
@keyframes erIn{from{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}

/* === Chat Area === */
.chat{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:28px 20px 16px;scroll-behavior:smooth}
.chat::-webkit-scrollbar{width:2px}
.chat::-webkit-scrollbar-thumb{background:var(--text3);border-radius:1px}

/* === Welcome Page === */
.welcome{display:flex;flex-direction:column;align-items:center;padding:20px 0;min-height:calc(100% - 40px);animation:welcomeIn .5s cubic-bezier(.16,1,.3,1)}
@keyframes welcomeIn{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

.hero{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;padding-top:10px}
.hero-bg{position:absolute;top:-10px;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle,var(--glow-purple) 0%,transparent 70%);pointer-events:none;z-index:0;animation:heroGlow 3s ease-in-out infinite alternate}
@keyframes heroGlow{from{opacity:.6;transform:scale(1)}to{opacity:1;transform:scale(1.08)}}
.hero-img{position:relative;z-index:1;width:150px;height:auto;max-height:190px;object-fit:contain;margin-bottom:20px;animation:heroPop .6s cubic-bezier(.34,1.56,.64,1) .1s both}
@keyframes heroPop{from{opacity:0;transform:scale(.88) translateY(12px)}to{opacity:1;transform:scale(1) translateY(0)}}
.hero-title{position:relative;z-index:1;font-size:19px;font-weight:700;color:var(--text);letter-spacing:-.3px;animation:fadeUp .5s ease .25s both}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* === Guide Card === */
.guide-card{display:flex;align-items:center;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:16px 18px;width:100%;max-width:340px;box-shadow:var(--shadow-sm);margin-top:28px;animation:fadeUp .5s ease .25s both}
.guide-icon{flex-shrink:0;width:40px;height:40px;border-radius:12px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:18px}
.guice-content{flex:1;min-width:0}
.guide-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:3px}
.guide-desc{font-size:12px;color:var(--text2);line-height:1.6}

/* === Note === */
.w-note{font-size:11px;color:var(--text3);line-height:1.5;letter-spacing:.3px;margin-top:28px;animation:fadeUp .5s ease .4s both}

/* === Message Bubbles === */
.msg{display:flex;margin-bottom:14px;align-items:flex-start}
.msg.u{justify-content:flex-end}
.msg.a{justify-content:flex-start}
.msg.s{justify-content:center}
.msg.u+.msg.u,.msg.a+.msg.a{margin-top:-10px}
.msg.u.msg-anim{animation:upUser .25s cubic-bezier(.16,1,.3,1)}
.msg.a.msg-anim{animation:upAi .4s cubic-bezier(.16,1,.3,1)}
@keyframes upUser{from{opacity:0;transform:translateY(8px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes upAi{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.msg-consec .avatar.a,.msg-consec .avatar.u{opacity:0;width:0;margin:0;overflow:hidden}
.msg-consec .bubble{border-radius:18px}
.msg.u.msg-consec .bubble{border-top-right-radius:5px}
.msg.a.msg-consec .bubble{border-top-left-radius:5px}
.avatar{width:30px;height:30px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;margin-top:4px}
.avatar.a{background:var(--primary-gradient);color:#fff;margin-right:10px;box-shadow:0 2px 6px rgba(92,82,120,.2)}
.avatar.u{background:var(--line);color:var(--text3);margin-left:10px;order:1}
.bubble{max-width:78%;padding:11px 15px;border-radius:18px;font-size:15px;line-height:1.65;word-break:break-word;white-space:pre-wrap}
.msg.u .bubble{background:var(--primary-gradient);color:#fff;border-bottom-right-radius:5px;box-shadow:var(--shadow-md)}
.msg.a .bubble{background:var(--surface);color:var(--text);border-bottom-left-radius:5px;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.msg.s .bubble{background:transparent;color:var(--text3);font-size:12px;max-width:90%;padding:6px 12px}
.ts{font-size:11px;color:var(--text3);margin-top:6px;text-align:right;line-height:1;opacity:.7}
.msg.u .ts{color:rgba(255,255,255,.45)}
.msg.u+.msg.u .ts,.msg.a+.msg.a .ts{display:none}

/* === Thinking (Typing Indicator) === */
.think{display:flex;align-items:center;gap:4px;padding:4px 0}
.think-text{font-size:13px;color:var(--text2);font-weight:500}
.think-dots{display:inline-flex;gap:2px}
.think-dots span{width:4px;height:4px;border-radius:50%;background:var(--primary);display:inline-block;animation:dotBounce 1.2s infinite ease-in-out}
.think-dots span:nth-child(2){animation-delay:.2s}
.think-dots span:nth-child(3){animation-delay:.4s}
@keyframes dotBounce{0%,60%,100%{opacity:.15;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.cursor{display:inline;animation:blink .7s infinite;color:var(--primary);opacity:.6}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}

/* === Toast === */
.toast{position:fixed;top:40%;left:50%;transform:translate(-50%,-50%);background:rgba(28,24,51,.8);color:#fff;padding:8px 20px;border-radius:8px;font-size:13px;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.toast.show{opacity:1}

/* === Input Bar === */
.input-bar{flex-shrink:0;padding:10px 16px 4px;background:var(--surface);box-shadow:0 -2px 12px rgba(92,82,120,.05)}
.input-box{display:flex;align-items:center;gap:4px;background:var(--bg);border-radius:100px;padding:4px 2px 4px 14px;transition:box-shadow .3s,background .3s,border-color .3s;border:1px solid transparent}
.input-box:focus-within{background:var(--surface);border-color:var(--primary-mid);box-shadow:0 0 0 3px rgba(139,126,200,.1),0 0 20px rgba(139,126,200,.06);animation:inputGlow .6s ease-out}
@keyframes inputGlow{0%{box-shadow:0 0 0 0 rgba(139,126,200,.25),0 0 30px rgba(139,126,200,.1)}100%{box-shadow:0 0 0 3px rgba(139,126,200,.1),0 0 20px rgba(139,126,200,.06)}}
.input-box input{flex:1;border:none;background:transparent;font-size:15px;outline:none;font-family:inherit;color:var(--text);padding:10px 4px}
.input-box input::placeholder{color:var(--text3)}
.btn-clear{width:28px;height:28px;border:none;border-radius:50%;background:transparent;color:var(--text3);cursor:pointer;display:none;align-items:center;justify-content:center;font-size:12px;flex-shrink:0;transition:transform .3s cubic-bezier(.34,1.56,.64,1),color .15s,background .15s}
.btn-clear.show{display:flex}
.btn-clear:active{background:var(--line);color:var(--text2)}
.btn-clear-spin{transform:rotate(90deg)!important}
.btn-send{width:36px;height:36px;border:none;border-radius:50%;background:var(--primary-gradient);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:opacity .2s,transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s;opacity:.3;transform:scale(.85);pointer-events:none;flex-shrink:0;will-change:transform}
.btn-send.active{opacity:1;transform:scale(1);pointer-events:auto;box-shadow:0 2px 10px rgba(92,82,120,.28)}
.btn-send:active{transform:scale(.88)!important;transition-duration:.05s!important}
.btn-send-sent{animation:sendSpring .35s cubic-bezier(.34,1.56,.64,1)!important}
@keyframes sendSpring{0%{transform:scale(.88)}40%{transform:scale(1.12)}70%{transform:scale(.95)}100%{transform:scale(1)}}

/* === Footer === */
.footer{flex-shrink:0;text-align:center;padding:6px 16px calc(6px + var(--safe-bottom));font-size:10px;background:var(--surface);line-height:1.6}
.footer a{display:inline-flex;align-items:center;gap:4px;color:var(--text3);text-decoration:none}
.footer a:active{color:var(--primary)}
.footer a img{width:12px;height:12px}
.fb{font-weight:500;color:var(--text2)}
.ft{color:var(--text3)}