:root{
  --bg:#f8fafc;--surface:#fff;--surface-2:#f1f5f9;--text:#0f172a;--muted:#64748b;
  --line:#e2e8f0;--brand:#2563eb;--brand-2:#0f172a;--ok:#0f766e;--danger:#b91c1c;
  --shadow:0 18px 50px rgba(15,23,42,.08);--radius:20px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{cursor:pointer}
img{max-width:100%}
.container{width:min(1180px,calc(100% - 32px));margin:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-wrap{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#2563eb,#0f172a);color:#fff;font-weight:900}
.brand strong{display:block;font-size:16px}.brand small{display:block;color:var(--muted);font-size:12px}
.top-nav{display:flex;gap:20px;color:#334155;font-size:14px}
.hero{padding:72px 0 42px;background:
  radial-gradient(circle at top right,rgba(37,99,235,.12),transparent 34%),
  linear-gradient(180deg,#fff,#f8fafc)}
.hero-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:36px;align-items:center}
.eyebrow{display:inline-block;color:var(--brand);font-size:12px;font-weight:800;letter-spacing:.14em;margin-bottom:10px}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(38px,6vw,66px);line-height:1.05;letter-spacing:-.045em;max-width:850px;margin-bottom:22px}
.hero p{font-size:18px;color:#475569;max-width:780px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0 20px}
.btn{border:1px solid transparent;border-radius:12px;padding:11px 16px;font-weight:750;background:#fff;color:var(--text);transition:.18s ease}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(37,99,235,.24)}
.btn.ghost,.btn.secondary{border-color:var(--line);background:#fff}
.btn.danger-lite{background:#fff;border-color:#fecaca;color:var(--danger)}
.btn.full{width:100%}.btn.mini{font-size:13px;padding:9px 10px;border-color:var(--line)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.trust-row{display:flex;gap:16px;flex-wrap:wrap;color:#475569;font-size:13px;font-weight:700}
.hero-card{background:var(--brand-2);color:#fff;border-radius:28px;padding:30px;box-shadow:var(--shadow)}
.hero-card p{color:#cbd5e1;font-size:15px;margin-bottom:0}.hero-card h2{font-size:24px}
.privacy-badge{display:inline-block;background:rgba(255,255,255,.1);padding:7px 10px;border-radius:999px;font-size:12px;margin-bottom:18px}
.ad-slot{padding:16px 0 28px}.ad-placeholder{min-height:92px;border:1px dashed #cbd5e1;border-radius:16px;background:#fff;display:grid;place-items:center;text-align:center;color:#94a3b8}.ad-placeholder small{display:block}
.tools-section{padding:44px 0 72px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:24px}.section-heading h2{font-size:36px;margin-bottom:0}.section-heading p{max-width:560px;color:var(--muted);margin-bottom:0}
.workspace{display:grid;grid-template-columns:330px 1fr;gap:22px;align-items:start}
.control-panel,.results-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.control-panel{padding:18px;position:sticky;top:92px}
.dropzone{border:2px dashed #bfdbfe;background:#eff6ff;border-radius:16px;padding:24px 14px;text-align:center;display:block;color:#1e3a8a;cursor:pointer}
.dropzone.dragover{background:#dbeafe;border-color:#2563eb}
.drop-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:#2563eb;color:#fff;font-size:28px;margin:0 auto 10px}
.dropzone strong,.dropzone small{display:block}.dropzone small{color:#64748b;margin-top:6px}
.panel-block{padding:18px 0;border-bottom:1px solid var(--line)}.panel-block h3{font-size:14px;margin-bottom:10px}.panel-block small{display:block;color:var(--muted);font-size:12px;margin-top:8px}
.label-row{display:flex;align-items:center;justify-content:space-between}.label-row h3{margin-bottom:0}.label-row output{color:var(--brand);font-weight:800}
select,input[type=number]{width:100%;border:1px solid #cbd5e1;border-radius:10px;padding:10px 11px;background:#fff;color:var(--text)}
input[type=range]{width:100%;accent-color:var(--brand)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:10px}.grid-2 label{font-size:12px;color:#475569}
.checkline{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:13px;color:#475569}
.button-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.transform-state{font-size:12px;color:var(--muted);margin-top:10px}
.panel-actions{display:grid;gap:9px;padding-top:18px}
.results-panel{min-height:650px;padding:20px}.results-head{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-bottom:16px;border-bottom:1px solid var(--line)}.results-head h3{margin-bottom:2px}.results-head p{margin:0;color:var(--muted);font-size:13px}
.empty-state{text-align:center;padding:100px 20px;color:var(--muted)}.empty-visual{font-size:56px}.empty-state h3{color:var(--text)}
.image-list{display:grid;gap:14px;padding-top:16px}
.image-card{display:grid;grid-template-columns:108px 1fr auto;gap:14px;align-items:center;border:1px solid var(--line);border-radius:16px;padding:12px;background:#fff}
.thumb{width:108px;height:84px;border-radius:12px;background:#f1f5f9;object-fit:cover;border:1px solid var(--line)}
.file-info h4{font-size:14px;margin:0 0 6px;word-break:break-all}.file-meta{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:12px}.pill{background:var(--surface-2);padding:3px 7px;border-radius:999px}
.size-good{color:var(--ok);font-weight:800}.size-bad{color:#a16207;font-weight:800}
.card-actions{display:flex;gap:8px;flex-direction:column}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:10px 0 72px}.feature-grid article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.feature-grid article span{font-size:24px}.feature-grid h3{font-size:16px;margin:10px 0 6px}.feature-grid p{font-size:13px;color:var(--muted);margin:0}
.privacy-section{background:#0f172a;color:#fff;padding:72px 0}.privacy-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:50px}.privacy-grid h2{font-size:38px}.privacy-grid p{color:#cbd5e1}
.seo-copy{padding:68px 0}.seo-copy h2{font-size:30px}.seo-copy p{max-width:880px;color:#475569}
.site-footer{background:#fff;border-top:1px solid var(--line);padding:34px 0 24px}.footer-grid{display:flex;justify-content:space-between;gap:24px}.footer-grid p{color:var(--muted);font-size:13px}.footer-links{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:#475569}.footer-bottom{border-top:1px solid var(--line);padding-top:20px;margin-top:22px;color:#94a3b8;font-size:12px}
.toast{position:fixed;right:18px;bottom:18px;background:#0f172a;color:#fff;padding:12px 16px;border-radius:12px;box-shadow:var(--shadow);z-index:50;max-width:320px}
@media (max-width:900px){
  .top-nav{display:none}.hero{padding-top:42px}.hero-grid,.privacy-grid{grid-template-columns:1fr}.workspace{grid-template-columns:1fr}.control-panel{position:static}.feature-grid{grid-template-columns:repeat(2,1fr)}.section-heading{display:block}.section-heading p{margin-top:10px}.image-card{grid-template-columns:84px 1fr}.thumb{width:84px;height:72px}.card-actions{grid-column:1/-1;flex-direction:row}.card-actions .btn{flex:1}
}
@media (max-width:560px){
  .container{width:min(100% - 20px,1180px)}h1{font-size:40px}.hero-card{padding:22px}.feature-grid{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr 1fr}.results-panel{padding:12px}.results-head{align-items:flex-start}.results-head .btn{font-size:12px;padding:9px 10px}.image-card{grid-template-columns:72px 1fr;padding:10px}.thumb{width:72px;height:66px}.file-meta{gap:5px}.footer-grid{display:block}.footer-links{margin-top:16px}
}

/* V1.1 */
.new-tag{font-size:10px;font-weight:800;color:#1d4ed8;background:#dbeafe;padding:3px 7px;border-radius:999px}
.target-row{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}.target-row span{font-size:13px;color:var(--muted);font-weight:700}
.stack-label{display:grid;gap:7px;font-size:12px;color:#475569;margin-bottom:10px}
input[type=text]{width:100%;border:1px solid #cbd5e1;border-radius:10px;padding:10px 11px;background:#fff;color:var(--text)}
.watermark-grid{margin-top:10px;align-items:end}.watermark-grid input[type=range]{margin-top:13px}
.exif-note{background:#f8fafc;margin:12px -8px 0;padding:14px 8px;border-radius:12px;border-bottom:0}.exif-note p{font-size:12px;color:var(--muted);margin:0}


/* V1.2 mobile-first UX */
.quick-tools{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;padding:8px 0 34px}
.quick-tool{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px;text-align:left;display:grid;grid-template-columns:auto 1fr;column-gap:10px;row-gap:1px;align-items:center;color:var(--text);box-shadow:0 8px 24px rgba(15,23,42,.04)}
.quick-tool>span{grid-row:1/3;font-size:26px}.quick-tool strong{font-size:14px}.quick-tool small{font-size:11px;color:var(--muted)}
.quick-tool:hover{border-color:#bfdbfe;background:#f8fbff}
.faq-section{padding:70px 0}.faq-heading{margin-bottom:22px}.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.faq-list details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 16px;overflow:hidden}
.faq-list summary{list-style:none;cursor:pointer;padding:16px 28px 16px 0;font-weight:800;font-size:14px;position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary:after{content:"＋";position:absolute;right:2px;top:15px;color:var(--brand);font-size:19px}
.faq-list details[open] summary:after{content:"−"}
.faq-list details p{color:var(--muted);font-size:13px;padding:0 0 16px;margin:0}
.crop-modal{position:fixed;inset:0;background:rgba(15,23,42,.72);z-index:100;display:none;align-items:center;justify-content:center;padding:20px}
.crop-modal.open{display:flex}.crop-dialog{width:min(760px,100%);max-height:92vh;overflow:auto;background:#fff;border-radius:20px;box-shadow:0 30px 80px rgba(0,0,0,.28)}
.crop-dialog-head{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}
.crop-dialog-head strong,.crop-dialog-head small{display:block}.crop-dialog-head small{font-size:11px;color:var(--muted);margin-top:2px}
.icon-btn{border:0;background:#f1f5f9;border-radius:10px;width:40px;height:40px;font-weight:900}
.crop-ratio-bar{display:flex;gap:8px;overflow:auto;padding:12px 16px;border-bottom:1px solid var(--line)}
.ratio-btn{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 14px;font-weight:750;white-space:nowrap}
.ratio-btn.active{background:#0f172a;color:#fff;border-color:#0f172a}
.crop-canvas-wrap{position:relative;background:#0f172a;display:grid;place-items:center;min-height:360px;touch-action:none;overflow:hidden}
#cropCanvas{display:block;max-width:100%;max-height:65vh;touch-action:none}
.crop-help{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);background:rgba(15,23,42,.78);color:#fff;border-radius:999px;padding:5px 10px;font-size:11px;pointer-events:none}
.crop-dialog-actions{display:grid;grid-template-columns:1fr 2fr;gap:10px;padding:14px 16px}
.mobile-action-bar{display:none}
.visual-crop-ready{color:#0f766e;font-weight:800}
body.modal-open{overflow:hidden}

@media (max-width:900px){
  .quick-tools{grid-template-columns:repeat(2,1fr)}
  .faq-list{grid-template-columns:1fr}
  .control-panel{padding:14px}
  .panel-block{padding:15px 0}
  select,input[type=number],input[type=text]{min-height:46px;font-size:16px}
  .btn{min-height:44px}
  .dropzone{padding:20px 12px}
}
@media (max-width:560px){
  body{padding-bottom:72px}
  .site-header .nav-wrap{min-height:62px}.brand-mark{width:36px;height:36px}.brand strong{font-size:14px}
  .hero{padding:32px 0 20px}.hero h1{font-size:34px;line-height:1.08}.hero p{font-size:15px}.hero-card{display:none}
  .hero-actions .btn{flex:1;text-align:center}.trust-row{font-size:11px;gap:8px}
  .ad-slot{padding-bottom:16px}.quick-tools{gap:8px;padding-bottom:22px}.quick-tool{padding:12px 10px;border-radius:13px}.quick-tool>span{font-size:22px}.quick-tool strong{font-size:13px}
  .tools-section{padding-top:26px}.section-heading h2{font-size:27px}.section-heading p{font-size:13px}
  .workspace{gap:12px}.control-panel,.results-panel{border-radius:14px}
  .button-grid{gap:6px}.button-grid .btn{padding:9px 6px;font-size:12px}
  .panel-actions{padding-top:14px}
  .results-panel{min-height:430px}.empty-state{padding:55px 15px}
  .image-card{grid-template-columns:72px 1fr;gap:10px}.file-info h4{font-size:13px}.pill{font-size:10px}
  .card-actions{display:grid;grid-template-columns:repeat(2,1fr);gap:6px}.card-actions .btn{width:100%;padding:8px 6px;font-size:12px}
  .mobile-action-bar{position:fixed;display:grid;grid-template-columns:1fr 1.3fr;left:0;right:0;bottom:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding:8px max(10px,env(safe-area-inset-right)) calc(8px + env(safe-area-inset-bottom)) max(10px,env(safe-area-inset-left));gap:8px}
  .mobile-action-bar button{border:1px solid var(--line);background:#fff;border-radius:12px;min-height:48px;font-weight:850;color:#0f172a}
  .mobile-action-bar button:last-child{background:#2563eb;color:#fff;border-color:#2563eb}
  .crop-modal{padding:0;align-items:flex-end}.crop-dialog{width:100%;max-height:94vh;border-radius:20px 20px 0 0}.crop-canvas-wrap{min-height:310px}.crop-dialog-actions{padding-bottom:calc(14px + env(safe-area-inset-bottom))}
  .faq-section{padding:52px 0}.faq-list summary{font-size:13px}.privacy-section{padding:52px 0}.privacy-grid h2{font-size:30px}
}