:root{color-scheme:light;--ink:#17363a;--muted:#63777a;--teal-950:#063f44;--teal-800:#0b5e63;--teal-700:#0d7072;--teal-100:#dff2ef;--teal-50:#eff9f7;--coral:#ee785f;--paper:#fff;--canvas:#f3f7f6;--line:#dbe7e5;--shadow:0 16px 50px rgba(19,61,64,.11);font-family:"Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 8% 0%,rgba(85,181,171,.13),transparent 28rem),var(--canvas);color:var(--ink);font-size:16px;line-height:1.55}
button,input{font:inherit}button{-webkit-tap-highlight-color:transparent}
.skip-link{position:fixed;left:1rem;top:-4rem;z-index:100;padding:.7rem 1rem;border-radius:.6rem;background:var(--ink);color:#fff}.skip-link:focus{top:1rem}
.app-shell{width:min(100%,76rem);min-height:100vh;margin:0 auto;padding:0 1.5rem 8.5rem}
.topbar{display:flex;align-items:center;justify-content:space-between;height:5.2rem}
.brand{display:inline-flex;align-items:center;gap:.7rem;color:var(--teal-950);font-size:1.12rem;font-weight:800;letter-spacing:.08em;text-decoration:none}
.brand-mark{display:grid;width:2.35rem;height:2.35rem;place-items:center;border-radius:.8rem .8rem .8rem .2rem;background:var(--teal-800)}
.brand-mark svg{width:1.55rem;fill:none;stroke:#fff;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.7}
.icon-button{display:grid;width:2.7rem;height:2.7rem;padding:0;place-items:center;border:1px solid var(--line);border-radius:50%;background:rgba(255,255,255,.7);color:var(--teal-800);cursor:pointer}.icon-button svg{width:1.35rem;fill:none;stroke:currentColor;stroke-linecap:round;stroke-width:1.8}
.account-card{position:relative;display:flex;align-items:center;justify-content:space-between;min-height:12rem;overflow:hidden;padding:2rem 2.3rem;border-radius:2rem 2rem 2rem .65rem;background:var(--teal-950);box-shadow:var(--shadow);color:#fff}
.account-card:after{position:absolute;width:18rem;height:18rem;right:-6rem;bottom:-10rem;border:3rem solid rgba(255,255,255,.045);border-radius:50%;content:""}
.eyebrow{margin:0 0 .35rem;color:#a9d9d2;font-size:.82rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
h1,h2,p{margin-top:0}h1{margin-bottom:.3rem;font-size:clamp(1.7rem,4vw,2.55rem);line-height:1.22;letter-spacing:-.035em}.plan-name{margin-bottom:0;color:#b9d7d4;font-size:.94rem}
.balance{position:relative;z-index:1;display:grid;min-width:6.4rem;padding:.85rem .9rem;place-items:center;border:1px solid rgba(255,255,255,.15);border-radius:1.35rem;background:rgba(255,255,255,.08);backdrop-filter:blur(12px);color:#cce5e1;font-size:.78rem}.balance strong{margin:-.1rem 0;color:#fff;font-size:2.45rem;line-height:1.1}
.teacher-section,.schedule-section{padding-top:2.6rem}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:1rem}.section-heading>div{display:flex;align-items:center;gap:.7rem}
.step{color:var(--coral);font-size:.76rem;font-weight:900;letter-spacing:.08em}h2{margin-bottom:0;font-size:1.35rem;line-height:1.3}.section-note{margin:.35rem 0 1.1rem;color:var(--muted);font-size:.88rem}
.text-button,.reset-button{padding:.35rem .1rem;border:0;background:transparent;color:var(--teal-700);font-size:.9rem;font-weight:750;cursor:pointer}
.teacher-list{display:grid;grid-template-columns:repeat(4,1fr);gap:.8rem}
.teacher-card{position:relative;display:grid;min-height:7.7rem;padding:1rem;border:1px solid var(--line);border-radius:1.2rem;background:var(--paper);color:var(--ink);text-align:left;cursor:pointer;transition:transform 160ms ease,border-color 160ms ease,box-shadow 160ms ease}
.teacher-card:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(19,61,64,.08)}.teacher-card[aria-pressed=true]{border-color:var(--teal-700);box-shadow:inset 0 0 0 1px var(--teal-700)}
.skeleton-card{border-color:transparent;background:linear-gradient(100deg,#e7efed 20%,#f6f9f8 40%,#e7efed 60%);background-size:220% 100%;animation:skeleton 1.3s ease-in-out infinite;cursor:default}.skeleton-card:hover{transform:none;box-shadow:none}@keyframes skeleton{from{background-position:100% 0}to{background-position:-100% 0}}
.teacher-card[aria-pressed=true]:after{position:absolute;top:.65rem;right:.65rem;display:grid;width:1.25rem;height:1.25rem;place-items:center;border-radius:50%;background:var(--teal-700);color:#fff;content:"✓";font-size:.73rem;font-weight:900}
.teacher-avatar{display:grid;width:2.5rem;height:2.5rem;margin-bottom:.65rem;place-items:center;border-radius:.85rem .85rem .85rem .25rem;background:var(--avatar-color,var(--teal-100));color:var(--teal-950);font-size:.93rem;font-weight:900}
.teacher-name{font-size:.98rem;font-weight:800}.teacher-focus{color:var(--muted);font-size:.77rem}
.live-pill{display:inline-flex;align-items:center;gap:.42rem;color:var(--teal-700);font-size:.77rem;font-weight:800}.live-pill span{width:.45rem;height:.45rem;border-radius:50%;background:#28a77d;box-shadow:0 0 0 .25rem rgba(40,167,125,.13)}
.hold-tip{display:flex;align-items:center;gap:.45rem}.hold-tip svg{flex:0 0 auto;width:1.15rem;fill:none;stroke:var(--coral);stroke-linecap:round;stroke-linejoin:round;stroke-width:1.5}
.date-tabs{display:flex;gap:.55rem;overflow-x:auto;padding:.2rem 0 .7rem;scrollbar-width:none}.date-tabs::-webkit-scrollbar{display:none}
.date-tab{min-width:6.2rem;padding:.72rem .8rem;border:1px solid var(--line);border-radius:1rem;background:#fff;color:var(--muted);cursor:pointer}.date-tab strong,.date-tab span{display:block}.date-tab strong{color:var(--ink);font-size:.93rem}.date-tab span{font-size:.74rem}.date-tab[aria-selected=true]{border-color:var(--teal-800);background:var(--teal-800);color:#c9e8e4}.date-tab[aria-selected=true] strong{color:#fff}
.schedule-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;margin-top:.25rem}
.slot{position:relative;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:.8rem;min-height:5.4rem;padding:.85rem 1rem;overflow:hidden;border:1px solid var(--line);border-radius:1.15rem;background:#fff;color:var(--ink);text-align:left;cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none;transition:border-color 180ms ease,background 180ms ease,transform 120ms ease}
.slot:before{position:absolute;inset:0 auto 0 0;width:.25rem;background:var(--teacher-color,var(--teal-700));content:""}.slot:hover:not(:disabled){border-color:#aecac6}.slot:active:not(:disabled),.slot.is-holding{transform:scale(.985)}
.slot.is-holding:after{position:absolute;inset:auto 0 0;height:.22rem;background:var(--coral);animation:holdProgress 480ms linear both;content:"";transform-origin:left}@keyframes holdProgress{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.slot[aria-pressed=true]{border-color:var(--teal-700);background:var(--teal-50);box-shadow:inset 0 0 0 1px var(--teal-700)}.slot:disabled{opacity:.48;cursor:not-allowed}
.slot-time{font-size:1.05rem;font-weight:900;font-variant-numeric:tabular-nums}.slot-teacher strong,.slot-teacher span{display:block}.slot-teacher strong{font-size:.9rem}.slot-teacher span{color:var(--muted);font-size:.75rem}
.slot-status{min-width:3.8rem;color:var(--teal-700);font-size:.74rem;font-weight:800;text-align:right}.slot[aria-pressed=true] .slot-status{color:var(--coral)}
.empty-state{padding:3rem 1rem;border:1px dashed #b8cdca;border-radius:1.2rem;color:var(--muted);text-align:center}.empty-state span,.empty-state strong{display:block}.empty-state span{margin-bottom:.5rem;color:var(--teal-700);font-size:2rem}.empty-state strong{color:var(--ink)}.empty-state p{margin:.2rem 0 0;font-size:.88rem}
.empty-state .loading-ring{width:2rem;height:2rem;margin:0 auto .8rem;border:.2rem solid var(--teal-100);border-top-color:var(--teal-700);border-radius:50%;animation:spin .75s linear infinite}.retry-button{margin-top:.75rem}.text-button:disabled{opacity:.45;cursor:not-allowed}@keyframes spin{to{transform:rotate(360deg)}}
.booking-bar{position:fixed;z-index:20;right:max(1rem,calc((100vw - 73rem)/2));bottom:max(1rem,env(safe-area-inset-bottom));left:max(1rem,calc((100vw - 73rem)/2));display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:.9rem 1rem .9rem 1.25rem;border:1px solid rgba(255,255,255,.1);border-radius:1.35rem;background:rgba(19,54,58,.95);box-shadow:0 15px 45px rgba(8,42,46,.25);backdrop-filter:blur(16px);color:#fff}
.booking-summary{display:flex;align-items:center;gap:1.5rem}.lesson-count span,.lesson-count strong{display:block}.lesson-count>span,.remaining-preview{color:#b9d3d1;font-size:.78rem}.lesson-count strong{margin-top:-.08rem;font-size:1.2rem}.remaining-preview{padding-left:1.5rem;border-left:1px solid rgba(255,255,255,.17)}.remaining-preview strong{color:#fff}
.primary-button,.secondary-button{display:inline-flex;min-height:3.25rem;align-items:center;justify-content:center;gap:.4rem;padding:.8rem 1.35rem;border:0;border-radius:.95rem;background:var(--coral);color:#fff;font-weight:850;cursor:pointer}.primary-button svg{width:1.1rem;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2}.primary-button:disabled{background:#607174;color:#a9b9ba;cursor:not-allowed}.secondary-button{width:100%;background:var(--teal-800)}.full-width{width:100%}
.modal{width:min(calc(100% - 2rem),27rem);padding:0;border:0;border-radius:1.7rem;color:var(--ink);box-shadow:0 30px 90px rgba(6,40,43,.28)}.modal::backdrop{background:rgba(6,40,43,.55);backdrop-filter:blur(5px)}.dialog-body{position:relative;padding:2rem;background:#fff;text-align:center}
.dialog-close{position:absolute;top:.8rem;right:.8rem;width:2.2rem;height:2.2rem;border:0;border-radius:50%;background:var(--canvas);color:var(--muted);font-size:1.4rem;cursor:pointer}.dialog-icon{display:grid;width:3.6rem;height:3.6rem;margin:0 auto 1rem;place-items:center;border-radius:1.15rem 1.15rem 1.15rem .35rem}
.help-icon{background:var(--teal-100);color:var(--teal-800);font-size:1.5rem;font-weight:900}.help-steps{display:grid;gap:.7rem;margin:1.3rem 0 1.5rem;padding:0;list-style:none;text-align:left}.help-steps li{display:flex;align-items:center;gap:.75rem;color:var(--muted);font-size:.9rem}.help-steps li span{display:grid;flex:0 0 1.75rem;width:1.75rem;height:1.75rem;place-items:center;border-radius:50%;background:var(--canvas);color:var(--teal-800);font-size:.78rem;font-weight:900}
.success-icon{background:var(--teal-100)}.success-icon svg{width:2rem;fill:none;stroke:var(--teal-700);stroke-linecap:round;stroke-linejoin:round;stroke-width:2.2}.success-modal .eyebrow{color:var(--teal-700)}.success-detail{margin:.8rem 0 1rem;color:var(--muted);font-size:.9rem}.success-balance{display:flex;align-items:center;justify-content:space-between;margin:1.2rem 0;padding:1rem;border-radius:1rem;background:var(--canvas);font-size:.9rem}.success-balance strong{color:var(--teal-800);font-size:1.1rem}.reset-button{margin-top:.7rem;color:var(--muted)}
.toast{position:fixed;z-index:50;top:1rem;left:50%;max-width:calc(100% - 2rem);padding:.7rem 1rem;border-radius:.8rem;background:var(--ink);color:#fff;font-size:.86rem;opacity:0;pointer-events:none;transform:translate(-50%,-1rem);transition:opacity 180ms ease,transform 180ms ease}.toast.is-visible{opacity:1;transform:translate(-50%,0)}
:focus-visible{outline:3px solid rgba(238,120,95,.45);outline-offset:3px}
@media(max-width:740px){.app-shell{padding:0 1rem 9.5rem}.topbar{height:4.6rem}.account-card{min-height:10.8rem;padding:1.45rem;border-radius:1.55rem 1.55rem 1.55rem .55rem}.balance{min-width:5.6rem}.balance strong{font-size:2.05rem}.teacher-list{grid-template-columns:repeat(2,1fr)}.teacher-card{min-height:7rem}.schedule-grid{grid-template-columns:1fr}.booking-bar{align-items:stretch;gap:.75rem;padding:.75rem}.booking-summary{flex:1;gap:.85rem}.remaining-preview{padding-left:.85rem}.primary-button{min-height:3.45rem}}
@media(max-width:470px){.booking-bar{flex-wrap:wrap}.booking-bar>.primary-button{width:100%}.booking-summary{justify-content:space-between;padding:0 .3rem}.date-tab{min-width:5.7rem}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}