/* ============================================================
   shadcn/ui — pure-CSS port for PHP site
   Mirrors src/components/ui/* tokens & variants from React.
   ============================================================ */

/* === Buttons === */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-weight:500;font-size:.875rem;line-height:1.25rem;
  border-radius:.5rem;padding:.5rem 1rem;height:2.5rem;
  border:1px solid transparent;cursor:pointer;
  transition:background-color .2s,color .2s,border-color .2s,opacity .2s,transform .15s;
  white-space:nowrap;text-decoration:none;
}
.btn:focus-visible{outline:2px solid hsl(var(--ring));outline-offset:2px}
.btn:disabled{opacity:.5;pointer-events:none}
.btn svg{width:1rem;height:1rem;flex-shrink:0}

/* sizes */
.btn-sm{height:2.25rem;padding:.375rem .75rem;font-size:.8125rem;border-radius:.5rem}
.btn-lg{height:2.75rem;padding:.625rem 2rem;font-size:.95rem;border-radius:.625rem}
.btn-xl{height:3rem;padding:.75rem 2.5rem;font-size:1rem;border-radius:.625rem}
.btn-icon{height:2.5rem;width:2.5rem;padding:0}

/* variants */
.btn-default{background:hsl(var(--primary));color:hsl(var(--primary-foreground))}
.btn-default:hover{background:hsl(var(--primary)/.9)}
.btn-secondary{background:hsl(var(--secondary));color:hsl(var(--secondary-foreground))}
.btn-secondary:hover{background:hsl(var(--secondary)/.8)}
.btn-outline{background:transparent;border-color:hsl(var(--border));color:hsl(var(--foreground))}
.btn-outline:hover{background:hsl(var(--accent)/.1);border-color:hsl(var(--primary));color:hsl(var(--primary))}
.btn-ghost{background:transparent;color:hsl(var(--foreground))}
.btn-ghost:hover{background:hsl(var(--accent)/.1);color:hsl(var(--primary))}
.btn-link{background:transparent;color:hsl(var(--primary));text-decoration:underline;text-underline-offset:4px;height:auto;padding:0}
.btn-destructive{background:hsl(var(--destructive));color:hsl(var(--destructive-foreground))}
.btn-destructive:hover{background:hsl(var(--destructive)/.9)}
.btn-gradient{background:linear-gradient(135deg,hsl(var(--health-green-dark)),hsl(var(--health-green-light)));color:#fff;border:0}
.btn-gradient:hover{opacity:.92}
.btn-accent{background:hsl(var(--accent));color:hsl(var(--accent-foreground))}
.btn-accent:hover{background:hsl(var(--accent)/.9)}

/* === Card === */
.card{background:hsl(var(--card));color:hsl(var(--card-foreground));border:1px solid hsl(var(--border));border-radius:.75rem;box-shadow:0 1px 2px rgba(0,0,0,.04)}
.card-header{padding:1.25rem 1.5rem 1rem;display:flex;flex-direction:column;gap:.375rem}
.card-title{font-family:'Noto Serif TC',serif;font-weight:700;font-size:1.125rem;color:hsl(var(--foreground));line-height:1.3}
.card-description{color:hsl(var(--muted-foreground));font-size:.875rem}
.card-content{padding:1rem 1.5rem 1.25rem}
.card-footer{padding:1rem 1.5rem 1.25rem;display:flex;align-items:center;gap:.5rem;border-top:1px solid hsl(var(--border))}
.card-hoverable{transition:box-shadow .25s,transform .25s}
.card-hoverable:hover{box-shadow:0 10px 25px -5px rgba(0,0,0,.1);transform:translateY(-2px)}

/* === Form controls === */
.label{display:block;font-size:.875rem;font-weight:500;color:hsl(var(--foreground));margin-bottom:.375rem}
.label .req{color:hsl(var(--destructive));margin-left:.125rem}
.input,.textarea,.select{
  display:block;width:100%;font-size:.9rem;line-height:1.4;
  padding:.5rem .75rem;height:2.5rem;
  background:hsl(var(--background));color:hsl(var(--foreground));
  border:1px solid hsl(var(--input));border-radius:.5rem;
  transition:border-color .15s,box-shadow .15s;
}
.textarea{height:auto;min-height:6rem;padding:.625rem .75rem;line-height:1.5}
.input:focus,.textarea:focus,.select:focus{outline:none;border-color:hsl(var(--ring));box-shadow:0 0 0 3px hsl(var(--ring)/.15)}
.input::placeholder,.textarea::placeholder{color:hsl(var(--muted-foreground))}
.select{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");background-repeat:no-repeat;background-position:right .75rem center;padding-right:2rem}

.checkbox{appearance:none;width:1rem;height:1rem;border:1px solid hsl(var(--input));border-radius:.25rem;background:hsl(var(--background));cursor:pointer;display:inline-flex;align-items:center;justify-content:center;vertical-align:middle}
.checkbox:checked{background:hsl(var(--primary));border-color:hsl(var(--primary));background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");background-size:.75rem .75rem;background-repeat:no-repeat;background-position:center}

.switch{position:relative;display:inline-block;width:2.5rem;height:1.4rem;flex-shrink:0}
.switch input{display:none}
.switch-slider{position:absolute;inset:0;background:hsl(var(--input));border-radius:9999px;transition:background .2s;cursor:pointer}
.switch-slider:before{content:"";position:absolute;top:.15rem;left:.15rem;width:1.1rem;height:1.1rem;background:#fff;border-radius:50%;transition:transform .2s;box-shadow:0 1px 2px rgba(0,0,0,.2)}
.switch input:checked + .switch-slider{background:hsl(var(--primary))}
.switch input:checked + .switch-slider:before{transform:translateX(1.1rem)}

/* === Badge === */
.badge{display:inline-flex;align-items:center;gap:.25rem;font-size:.7rem;font-weight:600;padding:.15rem .55rem;border-radius:9999px;line-height:1.25;border:1px solid transparent}
.badge-default{background:hsl(var(--primary));color:hsl(var(--primary-foreground))}
.badge-secondary{background:hsl(var(--secondary));color:hsl(var(--secondary-foreground))}
.badge-outline{background:transparent;border-color:hsl(var(--border));color:hsl(var(--foreground))}
.badge-success{background:#dcfce7;color:#166534}
.badge-warning{background:#fed7aa;color:#9a3412}
.badge-destructive{background:hsl(var(--destructive));color:hsl(var(--destructive-foreground))}
.badge-soft{background:hsl(var(--primary)/.1);color:hsl(var(--primary))}
.badge-accent{background:hsl(var(--accent)/.15);color:hsl(var(--accent))}

/* === Alert === */
.alert{position:relative;border:1px solid hsl(var(--border));border-radius:.5rem;padding:1rem 1rem 1rem 2.5rem;background:hsl(var(--background));color:hsl(var(--foreground))}
.alert > svg{position:absolute;left:1rem;top:1rem;width:1rem;height:1rem;color:hsl(var(--foreground))}
.alert-title{font-weight:600;line-height:1.25;margin-bottom:.25rem}
.alert-description{font-size:.875rem;color:hsl(var(--muted-foreground))}
.alert-success{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.alert-success > svg,.alert-success .alert-title,.alert-success .alert-description{color:#166534}
.alert-warning{background:#fffbeb;border-color:#fde68a;color:#92400e}
.alert-warning > svg,.alert-warning .alert-title,.alert-warning .alert-description{color:#92400e}
.alert-destructive{background:#fef2f2;border-color:#fecaca;color:#991b1b}
.alert-destructive > svg,.alert-destructive .alert-title,.alert-destructive .alert-description{color:#991b1b}
.alert-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}
.alert-info > svg,.alert-info .alert-title,.alert-info .alert-description{color:#1e40af}

/* === Table === */
.table-wrap{width:100%;overflow-x:auto;border:1px solid hsl(var(--border));border-radius:.75rem;background:hsl(var(--card))}
.table{width:100%;border-collapse:collapse;font-size:.875rem;caption-side:bottom}
.table thead{background:hsl(var(--muted)/.5)}
.table th{text-align:left;font-weight:600;color:hsl(var(--muted-foreground));padding:.75rem 1rem;border-bottom:1px solid hsl(var(--border));font-size:.8rem;text-transform:none}
.table td{padding:.75rem 1rem;border-bottom:1px solid hsl(var(--border));color:hsl(var(--foreground));vertical-align:middle}
.table tbody tr:last-child td{border-bottom:0}
.table tbody tr:hover{background:hsl(var(--muted)/.4)}

/* === Separator === */
.separator{background:hsl(var(--border));height:1px;width:100%;margin:1rem 0;border:0}
.separator-vertical{width:1px;height:100%;display:inline-block;background:hsl(var(--border));margin:0 .5rem}

/* === Tabs === */
.tabs-list{display:inline-flex;align-items:center;background:hsl(var(--muted));border-radius:.5rem;padding:.25rem;gap:.25rem;flex-wrap:wrap}
.tabs-trigger{display:inline-flex;align-items:center;justify-content:center;padding:.4rem .9rem;font-size:.875rem;font-weight:500;color:hsl(var(--muted-foreground));border-radius:.375rem;cursor:pointer;background:transparent;border:0;transition:background .15s,color .15s}
.tabs-trigger:hover{color:hsl(var(--foreground))}
.tabs-trigger.is-active{background:hsl(var(--background));color:hsl(var(--foreground));box-shadow:0 1px 2px rgba(0,0,0,.06)}
.tabs-content{display:none;margin-top:1rem;animation:fadein .25s ease}
.tabs-content.is-active{display:block}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* === Accordion === */
.accordion{border-bottom:1px solid hsl(var(--border))}
.accordion-item{border-top:1px solid hsl(var(--border))}
.accordion-trigger{width:100%;display:flex;justify-content:space-between;align-items:center;padding:1rem 0;background:transparent;border:0;cursor:pointer;font-weight:500;color:hsl(var(--foreground));text-align:left;font-size:.95rem}
.accordion-trigger:hover{text-decoration:underline}
.accordion-trigger .chev{transition:transform .2s;width:1rem;height:1rem}
.accordion-trigger[aria-expanded="true"] .chev{transform:rotate(180deg)}
.accordion-content{display:none;padding:0 0 1rem;color:hsl(var(--muted-foreground));font-size:.9rem;line-height:1.6}
.accordion-trigger[aria-expanded="true"] + .accordion-content{display:block}

/* === Dialog / Sheet === */
.dialog-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:80;opacity:0;pointer-events:none;transition:opacity .2s;backdrop-filter:blur(2px)}
.dialog-overlay.is-open{opacity:1;pointer-events:auto}
.dialog{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%) scale(.96);background:hsl(var(--background));border:1px solid hsl(var(--border));border-radius:.75rem;box-shadow:0 25px 50px -12px rgba(0,0,0,.25);z-index:90;width:92vw;max-width:32rem;max-height:90vh;overflow-y:auto;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}
.dialog.is-open{opacity:1;pointer-events:auto;transform:translate(-50%,-50%) scale(1)}
.dialog-header{padding:1.25rem 1.5rem 1rem;border-bottom:1px solid hsl(var(--border))}
.dialog-title{font-family:'Noto Serif TC',serif;font-size:1.125rem;font-weight:700;color:hsl(var(--foreground))}
.dialog-description{color:hsl(var(--muted-foreground));font-size:.875rem;margin-top:.25rem}
.dialog-body{padding:1.25rem 1.5rem}
.dialog-footer{padding:1rem 1.5rem;display:flex;justify-content:flex-end;gap:.5rem;border-top:1px solid hsl(var(--border))}
.dialog-close{position:absolute;right:1rem;top:1rem;background:transparent;border:0;color:hsl(var(--muted-foreground));cursor:pointer;padding:.25rem;border-radius:.25rem}
.dialog-close:hover{color:hsl(var(--foreground));background:hsl(var(--muted))}

/* Sheet (side drawer) */
.sheet{position:fixed;top:0;bottom:0;background:hsl(var(--background));border:1px solid hsl(var(--border));z-index:90;width:min(360px,90vw);transition:transform .25s;box-shadow:-4px 0 20px rgba(0,0,0,.15)}
.sheet-right{right:0;transform:translateX(100%)}
.sheet-left{left:0;transform:translateX(-100%)}
.sheet.is-open.sheet-right,.sheet.is-open.sheet-left{transform:translateX(0)}

/* === Dropdown === */
.dropdown{position:relative;display:inline-block}
.dropdown-menu{position:absolute;top:calc(100% + 4px);right:0;min-width:11rem;background:hsl(var(--popover));color:hsl(var(--popover-foreground));border:1px solid hsl(var(--border));border-radius:.5rem;box-shadow:0 10px 25px -5px rgba(0,0,0,.1);padding:.25rem;z-index:60;opacity:0;pointer-events:none;transform:translateY(-4px);transition:opacity .15s,transform .15s}
.dropdown.is-open .dropdown-menu{opacity:1;pointer-events:auto;transform:none}
.dropdown-item{display:flex;align-items:center;gap:.5rem;padding:.45rem .65rem;border-radius:.375rem;font-size:.875rem;color:hsl(var(--foreground));cursor:pointer;text-decoration:none}
.dropdown-item:hover{background:hsl(var(--accent)/.1);color:hsl(var(--primary))}
.dropdown-separator{height:1px;background:hsl(var(--border));margin:.25rem 0}
.dropdown-label{padding:.4rem .65rem;font-size:.75rem;color:hsl(var(--muted-foreground));font-weight:600}

/* === Toast / Sonner === */
.toaster{position:fixed;bottom:1.25rem;right:1.25rem;z-index:100;display:flex;flex-direction:column;gap:.5rem;pointer-events:none}
.toast{background:hsl(var(--background));color:hsl(var(--foreground));border:1px solid hsl(var(--border));border-radius:.5rem;padding:.75rem 1rem;box-shadow:0 10px 25px -5px rgba(0,0,0,.15);min-width:18rem;max-width:24rem;pointer-events:auto;animation:toast-in .25s ease;display:flex;align-items:flex-start;gap:.5rem}
.toast-success{border-color:#bbf7d0;background:#f0fdf4}
.toast-error{border-color:#fecaca;background:#fef2f2}
.toast-info{border-color:#bfdbfe;background:#eff6ff}
.toast-title{font-weight:600;font-size:.9rem}
.toast-description{font-size:.8rem;color:hsl(var(--muted-foreground));margin-top:.125rem}
@keyframes toast-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* === Skeleton === */
.skeleton{background:hsl(var(--muted));border-radius:.5rem;animation:skeleton-pulse 1.6s ease-in-out infinite}
@keyframes skeleton-pulse{0%,100%{opacity:.6}50%{opacity:.3}}

/* === Carousel === */
.carousel{position:relative;overflow:hidden}
.carousel-viewport{overflow:hidden}
.carousel-track{display:flex;transition:transform .6s ease}
.carousel-slide{flex:0 0 100%;min-width:0;position:relative}
.carousel-arrow{position:absolute;top:50%;transform:translateY(-50%);width:2.5rem;height:2.5rem;border-radius:9999px;background:rgba(0,0,0,.25);color:#fff;border:0;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:30;transition:background .2s}
.carousel-arrow:hover{background:rgba(0,0,0,.45)}
.carousel-prev{left:1rem}
.carousel-next{right:1rem}
.carousel-dots{position:absolute;bottom:1.5rem;left:50%;transform:translateX(-50%);display:flex;gap:.5rem;z-index:30}
.carousel-dot{width:.65rem;height:.65rem;border-radius:50%;background:rgba(255,255,255,.4);border:0;cursor:pointer;transition:background .2s,transform .2s}
.carousel-dot.is-active{background:#fff;transform:scale(1.15)}

/* === Lightbox === */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:120;display:none;align-items:center;justify-content:center;padding:2rem}
.lightbox.is-open{display:flex}
.lightbox img{max-width:100%;max-height:90vh;border-radius:.5rem}
.lightbox-close{position:absolute;top:1rem;right:1rem;width:2.5rem;height:2.5rem;border-radius:9999px;background:rgba(255,255,255,.15);color:#fff;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-arrow{position:absolute;top:50%;transform:translateY(-50%);width:3rem;height:3rem;border-radius:9999px;background:rgba(255,255,255,.15);color:#fff;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox-arrow.prev{left:1.5rem}
.lightbox-arrow.next{right:1.5rem}

/* === Tooltip (CSS-only) === */
.tip{position:relative}
.tip[data-tip]:hover::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 6px);left:50%;transform:translateX(-50%);background:hsl(var(--foreground));color:hsl(var(--background));font-size:.75rem;padding:.25rem .5rem;border-radius:.25rem;white-space:nowrap;z-index:50;pointer-events:none}

/* === Avatar === */
.avatar{display:inline-flex;align-items:center;justify-content:center;border-radius:50%;background:hsl(var(--muted));color:hsl(var(--muted-foreground));overflow:hidden;font-weight:600;font-size:.875rem;width:2.5rem;height:2.5rem;flex-shrink:0}
.avatar img{width:100%;height:100%;object-fit:cover}

/* === Pagination === */
.pagination{display:inline-flex;gap:.25rem;align-items:center}
.pagination a,.pagination span{display:inline-flex;align-items:center;justify-content:center;min-width:2.25rem;height:2.25rem;padding:0 .65rem;border:1px solid hsl(var(--border));border-radius:.5rem;font-size:.875rem;color:hsl(var(--foreground));text-decoration:none;background:hsl(var(--background))}
.pagination a:hover{background:hsl(var(--accent)/.1);color:hsl(var(--primary));border-color:hsl(var(--primary))}
.pagination .is-active{background:hsl(var(--primary));color:hsl(var(--primary-foreground));border-color:hsl(var(--primary))}
.pagination .disabled{opacity:.4;pointer-events:none}

/* === Helpers === */
.line-clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.line-clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}