:root{
  --red:#e5322d; --red-dark:#c9271f; --red-soft:#fdeceb;
  --ink:#1f2328; --ink-2:#5b6470; --ink-3:#8a93a0;
  --line:#e6e8ec; --bg:#f6f7f9; --card:#fff;
  --ok:#1f9d55; --warn:#d97706;
  --radius:12px; --shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px -12px rgba(16,24,40,.18);
  --sidebar-w:340px;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
.hidden{display:none!important}

/* ---------- thanh trên ---------- */
.topbar{height:60px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 24px;gap:24px;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.brand-mark{width:30px;height:30px;border-radius:8px;background:var(--red);position:relative}
.brand-mark::after{content:"";position:absolute;left:8px;top:6px;width:14px;height:18px;background:#fff;border-radius:2px;clip-path:polygon(0 0,65% 0,100% 30%,100% 100%,0 100%)}
.brand-name small{font-weight:500;color:var(--ink-3);margin-left:6px;font-size:13px}
.topnav{margin-left:auto;display:flex;gap:18px;font-size:14px;color:var(--ink-2)}
.topnav a:hover{color:var(--red)}

/* ---------- trang chủ ---------- */
.home{max-width:1180px;margin:0 auto;padding:48px 24px 80px}
.hero{text-align:center;margin-bottom:40px}
.hero h1{font-size:34px;line-height:1.2;margin:0 0 10px;letter-spacing:-.02em}
.hero p{color:var(--ink-2);font-size:17px;margin:0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:block;transition:transform .15s,box-shadow .15s,border-color .15s}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:transparent}
.tool-card .ic{width:46px;height:46px;border-radius:10px;display:grid;place-items:center;margin-bottom:14px}
.tool-card .ic svg{width:26px;height:26px}
.tool-card h3{margin:0 0 6px;font-size:17px}
.tool-card p{margin:0;color:var(--ink-2);font-size:14px}
.section-title{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-3);margin:34px 0 14px;font-weight:700}

/* ---------- trang công cụ ---------- */
.tool{min-height:calc(100vh - 60px)}
.tool-head{text-align:center;padding:48px 24px 10px}
.tool-head h1{font-size:34px;margin:0 0 8px;letter-spacing:-.02em}
.tool-head p{color:var(--ink-2);margin:0;font-size:17px}

/* upload */
.upload-wrap{max-width:760px;margin:30px auto 60px;padding:0 24px}
.dropzone{border:2px dashed #cfd4db;border-radius:16px;background:#fff;padding:56px 24px;text-align:center;transition:border-color .15s,background .15s}
.dropzone.over{border-color:var(--red);background:var(--red-soft)}
.dropzone .big{font-size:20px;font-weight:700;margin:18px 0 6px}
.dropzone .hint{color:var(--ink-3);font-size:14px}
.dropzone .dz-icon{width:72px;height:72px;margin:0 auto;border-radius:18px;background:var(--red-soft);display:grid;place-items:center}
.dropzone .dz-icon svg{width:36px;height:36px;color:var(--red)}
.reuse{margin-top:14px;text-align:center;font-size:14px;color:var(--ink-2)}
.reuse button{background:none;border:0;color:var(--red);font-weight:600;text-decoration:underline}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:10px;padding:10px 18px;font-weight:600;transition:.12s}
.btn:hover{border-color:#c5cad3;background:#fafbfc}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--red);border-color:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-dark);border-color:var(--red-dark)}
.btn-lg{font-size:18px;padding:16px 28px;border-radius:12px}
.btn-block{width:100%}
.btn-ghost{border-color:transparent;background:transparent;color:var(--ink-2)}
.btn-ghost:hover{background:#eef0f3}
.btn-icon{width:38px;height:38px;padding:0;border-radius:10px}
.btn svg{width:18px;height:18px}

/* workspace */
.ws{display:flex;min-height:calc(100vh - 60px)}
.ws-main{flex:1;padding:24px 28px 110px;min-width:0}
.ws-side{width:var(--sidebar-w);background:#fff;border-left:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:60px;height:calc(100vh - 60px)}
.ws-side-body{padding:22px 22px 10px;overflow:auto;flex:1}
.ws-side h2{margin:0 0 4px;font-size:22px}
.ws-side .sub{color:var(--ink-2);font-size:13px;margin:0 0 18px}
.ws-side-foot{padding:16px 22px 22px;border-top:1px solid var(--line);background:#fff}
.ws-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.ws-bar .spacer{flex:1}
.ws-bar .count{color:var(--ink-2);font-size:14px}

.opt{margin-bottom:18px}
.opt label.t{display:block;font-weight:700;font-size:13px;margin-bottom:8px;color:var(--ink)}
.opt .help{font-size:12px;color:var(--ink-3);margin-top:6px}
.opt input[type=text],.opt input[type=number],.opt select{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font:inherit;background:#fff}
.opt input:focus,.opt select:focus{outline:2px solid var(--red-soft);border-color:var(--red)}
.seg{display:flex;flex-direction:column;gap:8px}
.seg label{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:10px 12px;cursor:pointer}
.seg label:has(input:checked){border-color:var(--red);background:var(--red-soft)}
.seg input{margin-top:4px;accent-color:var(--red)}
.seg b{display:block;font-size:14px}
.seg span{font-size:12px;color:var(--ink-2)}
.chk{display:flex;gap:10px;align-items:center;font-size:14px;cursor:pointer}
.chk input{accent-color:var(--red);width:16px;height:16px}
.btn-row{display:flex;gap:8px}
.btn-row .btn{flex:1}
.stat{background:var(--bg);border-radius:10px;padding:10px 12px;font-size:13px;color:var(--ink-2)}

/* file cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px;position:relative;transition:box-shadow .12s,border-color .12s;user-select:none}
.card:hover{box-shadow:var(--shadow)}
.card .thumb{background:#eef0f3;border-radius:8px;height:200px;display:grid;place-items:center;overflow:hidden;position:relative}
.card .thumb img,.card .thumb canvas{max-width:100%;max-height:100%;image-rendering:auto;box-shadow:0 1px 3px rgba(0,0,0,.2);background:#fff;transition:transform .2s}
.card .cap{font-size:12px;margin-top:8px;color:var(--ink-2);display:flex;justify-content:space-between;gap:6px}
.card .cap .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink);font-weight:600}
.card .acts{position:absolute;top:14px;right:14px;display:flex;gap:4px;opacity:0;transition:opacity .12s}
.card:hover .acts,.card.selected .acts{opacity:1}
.card .acts button{width:28px;height:28px;border-radius:7px;border:0;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.25);display:grid;place-items:center;color:var(--ink)}
.card .acts button:hover{background:var(--red);color:#fff}
.card .acts button svg{width:15px;height:15px}
.card.selected{border-color:var(--red);box-shadow:0 0 0 2px var(--red-soft)}
.card.removed .thumb{opacity:.35}
.card.removed::after{content:"";position:absolute;inset:10px;height:200px;background:
  linear-gradient(45deg,transparent 47%,var(--red) 47%,var(--red) 53%,transparent 53%),
  linear-gradient(-45deg,transparent 47%,var(--red) 47%,var(--red) 53%,transparent 53%);opacity:.6;border-radius:8px;pointer-events:none}
.card.blank .thumb{background:#fff;border:1px dashed #cfd4db}
.card .badge{position:absolute;left:14px;top:14px;background:rgba(31,35,40,.75);color:#fff;font-size:11px;padding:2px 7px;border-radius:999px}
.card .badge.sel{background:var(--red)}
.card .cut{position:absolute;right:-13px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:50%;background:#fff;border:1px solid var(--line);display:grid;place-items:center;z-index:2;color:var(--ink-3)}
.card .cut.on{background:var(--red);color:#fff;border-color:var(--red)}
.card .cut svg{width:14px;height:14px}
.sortable-ghost{opacity:.3}
.sortable-chosen{box-shadow:var(--shadow)}
.add-card{border:2px dashed #cfd4db;border-radius:12px;display:grid;place-items:center;min-height:240px;color:var(--ink-3);cursor:pointer;font-weight:600}
.add-card:hover{border-color:var(--red);color:var(--red);background:var(--red-soft)}
.file-sep{grid-column:1/-1;font-size:13px;color:var(--ink-3);font-weight:600;margin-top:6px}

/* crop */
.crop-wrap{display:flex;flex-direction:column;align-items:center;gap:12px}
.crop-stage{position:relative;overflow:hidden;display:inline-block;background:#fff;box-shadow:var(--shadow);user-select:none;touch-action:none}
.crop-stage canvas{display:block}
.crop-box{position:absolute;border:2px solid var(--red);box-shadow:0 0 0 9999px rgba(0,0,0,.45);cursor:move}
.crop-box .h{position:absolute;width:14px;height:14px;background:#fff;border:2px solid var(--red);border-radius:3px}
.crop-box .h.nw{left:-8px;top:-8px;cursor:nwse-resize}.crop-box .h.ne{right:-8px;top:-8px;cursor:nesw-resize}
.crop-box .h.sw{left:-8px;bottom:-8px;cursor:nesw-resize}.crop-box .h.se{right:-8px;bottom:-8px;cursor:nwse-resize}
.crop-nav{display:flex;gap:10px;align-items:center;color:var(--ink-2);font-size:14px}

/* processing / result */
.center{max-width:680px;margin:0 auto;padding:70px 24px;text-align:center}
.spinner{width:64px;height:64px;border:6px solid var(--red-soft);border-top-color:var(--red);border-radius:50%;animation:spin 1s linear infinite;margin:0 auto 22px}
@keyframes spin{to{transform:rotate(360deg)}}
.progress{height:8px;background:var(--line);border-radius:999px;overflow:hidden;margin:18px auto;max-width:420px}
.progress i{display:block;height:100%;background:var(--red);width:0;transition:width .2s}
.done-icon{width:84px;height:84px;border-radius:50%;background:#e8f7ee;color:var(--ok);display:grid;place-items:center;margin:0 auto 18px}
.done-icon svg{width:44px;height:44px}
.center h1{font-size:30px;margin:0 0 10px}
.center p{color:var(--ink-2);margin:0 0 24px}
.results{text-align:left;display:flex;flex-direction:column;gap:10px;margin:0 auto 24px;max-width:520px}
.result{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.result .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.result .sz{color:var(--ink-3);font-size:13px}
.next{margin-top:34px}
.next h3{font-size:14px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.08em;margin:0 0 12px}
.next .chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600}
.chip:hover{border-color:var(--red);color:var(--red)}
.err-box{background:#fff3f2;border:1px solid #f5c2bf;color:#9b1c16;border-radius:12px;padding:14px 16px;text-align:left;margin:0 auto 20px;max-width:520px}

/* login + toast */
.login{position:fixed;inset:0;background:rgba(246,247,249,.96);display:grid;place-items:center;z-index:50;padding:24px}
.login-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;max-width:380px;width:100%;box-shadow:var(--shadow);text-align:center}
.login-mark{width:52px;height:52px;border-radius:14px;background:var(--red);margin:0 auto 14px}
.login-box h2{margin:0 0 6px}
.login-box p{color:var(--ink-2);margin:0 0 18px;font-size:14px}
.login-box input{width:100%;border:1px solid var(--line);border-radius:10px;padding:12px;font:inherit;margin-bottom:10px;text-align:center;font-size:16px}
.login-err{color:var(--red);font-size:13px;min-height:18px;margin-top:8px}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 18px;border-radius:10px;font-size:14px;z-index:60;box-shadow:var(--shadow);max-width:90vw}
.toast.err{background:#9b1c16}

/* mobile */
@media (max-width:860px){
  .ws{flex-direction:column}
  .ws-side{width:100%;position:static;height:auto;border-left:0;border-top:1px solid var(--line)}
  .ws-main{padding:16px 16px 20px}
  .cards{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
  .card .thumb{height:150px}
  .tool-head{padding-top:28px}.tool-head h1{font-size:26px}
  .hero h1{font-size:26px}
}

/* cảm ứng: luôn hiện nút trên thẻ, nút hành động dính đáy */
@media (hover:none){ .card .acts{opacity:1} }
.ws-side-foot{position:sticky;bottom:0}
.brand-name{white-space:nowrap}
@media (max-width:480px){ .brand-name small{display:none} .topbar{padding:0 14px;gap:10px} .topnav{font-size:13px} }

/* dải thứ tự file (Ghép / Sắp xếp) */
.file-strip{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:-6px 0 16px}
.file-strip .lbl{font-size:13px;color:var(--ink-3);font-weight:600}
.file-chips{display:flex;gap:8px;flex-wrap:wrap}
.file-chip{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 8px 6px 10px;font-size:13px;cursor:grab;max-width:260px;user-select:none}
.file-chip .dot{width:10px;height:10px;border-radius:50%;background:var(--c,#999);flex:none}
.file-chip .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.file-chip .n{color:var(--ink-3);flex:none}
.file-chip button{border:0;background:transparent;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;color:var(--ink-3);padding:0}
.file-chip button svg{width:12px;height:12px}
.file-chip button:hover{background:var(--red-soft);color:var(--red)}
.card[style*="--c"] .cap .nm{color:var(--c)}
.card[style*="--c"] .badge:not(.sel){background:var(--c)}

.file-sep{display:flex;align-items:center;gap:8px;grid-column:1/-1;font-size:13px;color:var(--ink-2);margin-top:4px}
.file-sep .dot{width:10px;height:10px;border-radius:50%;flex:none}
.file-sep .nm{font-weight:700;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:50%}
.file-sep .n{color:var(--ink-3)}

/* thumbnail tải dần */
.card .thumb img.lazy{width:70%;height:85%;background:#e3e6ea;box-shadow:none;border-radius:4px;animation:pulse 1.2s ease-in-out infinite}
.card .thumb img.lazy.ready{width:auto;height:auto;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.2);animation:none}
@keyframes pulse{0%,100%{opacity:.6}50%{opacity:1}}

/* sửa chữ */
.edit-wrap{display:flex;flex-direction:column;align-items:center;gap:12px}
.edit-stage{position:relative;background:#fff;box-shadow:var(--shadow)}
.edit-stage canvas{display:block}
.text-layer{position:absolute;inset:0}
.tbox{position:absolute;cursor:text;border-radius:3px;outline:1px dashed transparent;transition:background .1s}
.tbox:hover{background:rgba(229,50,45,.14);outline-color:var(--red)}
.tbox.edited{background:#fff;color:#1f9d55;outline:1px solid #1f9d55;white-space:nowrap;overflow:visible;font-family:inherit;line-height:1}
.tedit{position:absolute;z-index:5;border:2px solid var(--red);border-radius:6px;padding:2px 6px;font:inherit;background:#fff;box-shadow:var(--shadow);outline:none}
.edit-list{display:flex;flex-direction:column;gap:6px}
.edit-item{display:flex;align-items:center;gap:6px;background:var(--bg);border-radius:10px;padding:8px 10px;font-size:13px}
.edit-item .ei{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.edit-item .pg{font-size:11px;color:var(--ink-3);font-weight:700}
.edit-item s{color:var(--ink-3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.edit-item b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#1f9d55}

.doc-icon{width:84px;height:104px;border-radius:8px;color:#fff;font-weight:800;font-size:18px;display:grid;place-items:center;box-shadow:0 2px 8px rgba(0,0,0,.2);letter-spacing:.02em}