@import url('https://fonts.googleapis.com/css2?family=Figtree:wght@400;500;600;700;800&display=swap');
:root {
  --color-primary: #6366f1;
  --color-primary-light: #c7d2fe;
  --color-primary-dark: #1e1b4b;
  --color-primary-hover: #4f46e5;
  --color-bg: #f8faff;
  --color-bg-white: #fff;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-text-dark: #475569;
  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-warning: #eab308;
  --color-success: #22c55e;
  --color-shadow: rgba(0,0,0,0.08);
  --color-header-bg: #1C2F52;
  --radius-sm: 5px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-main: 'Figtree', 'Inter', system-ui, sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
.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}
.hidden{display:none!important}
html{overflow:hidden;height:100%}
#app{display:flex;flex-direction:column;flex:1;min-height:0}
body{height:100%;overflow:hidden;display:flex;flex-direction:column;background:linear-gradient(155deg,var(--color-bg) 0%,var(--color-bg-white) 55%,var(--color-bg) 100%);font-family:var(--font-main);color:var(--color-text);font-size:16px}
::-webkit-scrollbar{width:5px}::-webkit-scrollbar-thumb{background:var(--color-primary-light);border-radius:3px}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes fu{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* ── Header ── */
#header{position:relative;display:flex;align-items:center;padding:0 24px;height:52px;gap:24px;background:var(--color-header-bg);flex-shrink:0;z-index:100;box-shadow:0 2px 12px rgba(0,0,0,0.15)}
#header a{text-decoration:none}
.logo{display:flex;align-items:center;text-decoration:none}.logo img{height:30px;width:auto;display:block}
#steps-desktop{position:absolute;left:50%;transform:translateX(-50%)}
.steps-flow{display:flex;align-items:center;gap:0}
.step{font-size:12px;color:#94a3b8;cursor:pointer;user-select:none;transition:all 0.2s;font-weight:600;
  padding:5px 13px;border-radius:20px;border:1.5px solid rgba(255,255,255,0.2);white-space:nowrap;
  position:relative;margin-right:22px}
.steps-flow .step:last-child{margin-right:0}
.step:not(.active):not(.done):hover{color:#fff;background:rgba(255,255,255,0.1);border-color:rgba(255,255,255,0.3)}
.step.done{color:#c7d2fe;background:rgba(99,102,241,0.2);border-color:rgba(99,102,241,0.4)}
.step.done:hover{background:rgba(99,102,241,0.3)}
.step.active{color:#fff;background:var(--color-primary);border-color:var(--color-primary);font-weight:700;box-shadow:0 2px 8px rgba(99,102,241,0.35)}
.steps-flow .step:not(:last-child)::after{content:'›';position:absolute;right:-17px;top:50%;transform:translateY(-50%);color:rgba(255,255,255,0.3);font-size:15px;font-weight:400;pointer-events:none}
/* Support button — always visible in header */
.support-btn{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.2);color:#fca5a5;font-size:13px;font-weight:600;padding:6px 13px;border-radius:6px;text-decoration:none;transition:all 0.15s;margin-left:auto}
.support-btn:hover{background:rgba(255,255,255,0.15);border-color:rgba(255,255,255,0.3);text-decoration:none}
/* Burger button — always visible */
.burger{background:none;border:1px solid rgba(255,255,255,.25);color:#c7d2fe;font-size:20px;padding:4px 9px;border-radius:6px;cursor:pointer;line-height:1;font-family:var(--font-main)}
.burger:hover{border-color:rgba(255,255,255,.4);color:#fff}
/* Site nav (burger dropdown) — hidden by default, shown on click */
.site-nav{display:none;position:absolute;top:52px;right:0;background:var(--color-header-bg);flex-direction:column;padding:8px 0;box-shadow:0 8px 24px rgba(0,0,0,.25);z-index:100;min-width:180px}
.site-nav.open{display:flex}
.site-nav a{color:#c7d2fe;font-size:14px;font-weight:600;padding:12px 20px;border-radius:0;transition:background .15s,color .15s;text-decoration:none}
.site-nav a:hover{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
/* Mobile steps bar (hidden on desktop) */
.steps-bar{display:none;background:var(--color-header-bg);padding:8px 14px;flex-shrink:0;box-shadow:0 2px 8px rgba(0,0,0,0.1);justify-content:center}
#kofi-popup{position:fixed;inset:0;background:rgba(12,12,20,0.55);display:flex;align-items:center;justify-content:center;z-index:800;animation:fu 0.2s ease}
#kofi-popup.hidden{display:none}
#kofi-popup-box{background:var(--color-bg-white);border-radius:16px;padding:32px 28px;max-width:320px;width:calc(100% - 48px);text-align:center;box-shadow:0 8px 40px rgba(99,102,241,0.18)}
#kofi-popup-box h3{font-size:18px;font-weight:800;color:var(--color-primary-dark);margin:0 0 10px}
#kofi-popup-box p{font-size:14px;color:var(--color-text-dark);line-height:1.6;margin:0 0 22px}
#kofi-popup-cta{display:inline-block;background:var(--color-primary);color:#fff;font-weight:700;font-size:15px;padding:11px 24px;border-radius:var(--radius-md);text-decoration:none;transition:background 0.15s;margin-bottom:14px}
#kofi-popup-cta:hover{background:var(--color-primary-hover)}
#kofi-popup-skip{display:block;width:100%;background:none;border:none;color:var(--color-text-muted);font-size:13px;cursor:pointer;padding:4px;transition:color 0.15s}
#kofi-popup-skip:hover{color:var(--color-text-dark)}

/* ── Stages ── */
.stage{display:none}.stage.active{display:flex;flex:1}
#stage-upload{justify-content:flex-start;align-items:center;flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch}
.upload-layout{display:flex;flex-direction:column;align-items:center;gap:0;width:100%;padding:24px 32px;margin:auto 0}
.upload-tagline{color:var(--color-text-secondary);font-size:17px;margin:0 0 24px;font-weight:500;text-align:center}
.upload-card{max-width:480px;width:100%}
.demo-video-wrap{max-width:480px;width:100%;margin-top:28px;border-radius:18px;overflow:hidden;box-shadow:0 4px 32px rgba(99,102,241,0.09);border:2px solid var(--color-primary-light)}
.demo-video{display:block;width:100%;height:auto}
#stage-label{flex:1;min-height:0;overflow:hidden}
#stage-preview{justify-content:center;padding:44px 22px}

/* ── Upload card ── */
.upload-card{background:#ffffff;border:2px dashed var(--color-primary-light);border-radius:18px;padding:44px 68px;text-align:center;animation:fu 0.4s ease;max-width:480px;box-shadow:0 4px 32px rgba(99,102,241,0.09)}
.upload-card.drag{border-color:var(--color-primary);background:rgba(99,102,241,0.04)}
.upload-card h2{font-size:22px;margin-bottom:10px;color:var(--color-primary-dark);font-weight:700}
.sub{color:var(--color-text-secondary);font-size:16px;margin-bottom:26px}
.error-msg{color:var(--color-danger);font-size:13px;margin-top:14px;min-height:16px}
.try-sample-link{display:inline-block;margin-top:12px;font-size:13px;color:var(--color-primary);text-decoration:underline;opacity:0.7;transition:opacity 0.2s}
.try-sample-link:hover{opacity:1}

/* ── Buttons ── */
.btn{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-hover));color:#fff;border:none;border-radius:var(--radius-md);padding:11px 26px;font-size:16px;font-weight:600;cursor:pointer;font-family:var(--font-main);transition:opacity 0.15s}
.btn:hover{opacity:0.88}.btn.disabled,.btn:disabled{opacity:0.3;cursor:not-allowed}
.btn-ghost{background:transparent;color:var(--color-primary);border:1px solid var(--color-primary-light)}
.full-w{width:100%}

/* ── Sidebar (rimossa) ── */
/* #sidebar rimosso */
/* #instr-section rimosso */
#band-actions{position:absolute;inset:0;pointer-events:none;z-index:2}
.ba-btn{position:absolute;pointer-events:auto;width:22px;height:22px;background:rgba(239,68,68,0.82);border:none;border-radius:50%;color:#fff;font-size:15px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;line-height:1;transform:translateY(-50%);transition:background 0.12s;box-shadow:0 1px 4px rgba(0,0,0,0.18)}
.ba-btn:hover{background:var(--color-danger-hover)}
.sys-confirm{position:absolute;left:50%;transform:translate(-50%,-50%);pointer-events:auto;z-index:5;background:var(--color-primary);color:#fff;border:2px solid #fff;border-radius:14px;padding:4px 14px;font-size:12px;font-weight:600;cursor:pointer;font-family:var(--font-main);box-shadow:0 2px 8px rgba(0,0,0,0.2);transition:background 0.3s,transform 0.15s,box-shadow 0.3s;white-space:nowrap}
.sys-confirm:hover{background:var(--color-primary-hover);transform:translate(-50%,-50%) scale(1.05)}
.copy-prev-btn{position:static;transform:none;font-size:13px;padding:7px 15px;border-radius:6px;box-shadow:0 2px 8px rgba(99,102,241,0.25);border:1px solid var(--color-border);left:auto;white-space:nowrap;animation:copyFlash 1.2s ease}
.copy-prev-btn:hover{transform:none;background:var(--color-primary-hover)}
@keyframes copyFlash{0%{box-shadow:0 0 0 0 rgba(99,102,241,0.7)}30%{box-shadow:0 0 0 8px rgba(99,102,241,0)}60%{box-shadow:0 0 0 0 rgba(99,102,241,0.5)}100%{box-shadow:0 2px 8px rgba(99,102,241,0.25)}}
.sys-confirm.confirmed{background:var(--color-success);box-shadow:0 2px 8px rgba(34,197,94,0.35)}
.sys-confirm.confirmed:hover{background:#16a34a;transform:translate(-50%,-50%) scale(1.05)}
.sys-confirm .tick{display:inline-block;width:0;overflow:hidden;transition:width 0.3s ease;vertical-align:middle}
.sys-confirm.confirmed .tick{width:16px}
.s-title{font-size:11px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--color-text-muted);padding-bottom:8px;border-bottom:1px solid var(--color-border);margin-bottom:10px;flex-shrink:0}
.s-title-row{display:flex;justify-content:space-between;align-items:center;padding-bottom:8px;border-bottom:1px solid var(--color-border);margin-bottom:10px;flex-shrink:0}
.s-title-row span{font-size:11px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--color-text-muted)}
#instr-list{overflow-y:auto;overflow-x:hidden;flex:1;min-height:0}
.btn-clear{background:none;border:none;color:var(--color-text-muted);cursor:pointer;font-size:11px;padding:3px 6px;border-radius:4px;font-family:var(--font-main);font-weight:600;transition:all 0.15s}
.btn-clear:hover{color:var(--color-danger);background:rgba(239,68,68,0.08)}
.i-row{display:flex;align-items:center;gap:7px;padding:6px 8px;background:var(--color-border-light);border-radius:var(--radius-sm);margin-bottom:4px;border:1px solid var(--color-border);cursor:pointer;transition:border-color 0.15s,background 0.15s}
.i-row.active{background:rgba(99,102,241,0.11);border-color:rgba(99,102,241,0.35)}
.dot{width:20px;height:20px;border-radius:var(--radius-sm);flex-shrink:0;cursor:pointer}
.i-input{background:transparent;border:1px solid transparent;color:var(--color-primary-dark);font-size:13px;flex:1;min-width:0;width:0;font-family:var(--font-main);outline:none;border-radius:4px;padding:2px 4px;transition:background 0.15s,border-color 0.15s;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.i-input:focus{background:var(--color-bg-white);border-color:var(--color-primary-light);color:var(--color-primary)}
.x-btn{background:none;border:none;color:#cbd5e1;cursor:pointer;font-size:14px;padding:0 4px;transition:color 0.15s;line-height:1;flex-shrink:0}
.x-btn:hover{color:var(--color-danger)}
.x-btn:disabled{opacity:0.2;cursor:default}
.ghost-btn{background:transparent;color:var(--color-primary);border:1px solid var(--color-primary-light);border-radius:6px;padding:7px 12px;font-size:13px;cursor:pointer;font-family:var(--font-main);width:100%;margin-top:6px;margin-bottom:10px;font-weight:600;transition:all 0.15s;flex-shrink:0}
.ghost-btn:hover{border-color:var(--color-primary);background:rgba(99,102,241,0.05)}
.hint{font-size:13px;color:var(--color-text-muted);font-style:italic;line-height:1.75}

/* ── Thumb strip ── */
#thumb-strip-wrap{border-right:1px solid var(--color-border);background:var(--color-bg);flex-shrink:0;display:none;overflow:hidden;width:120px}
#thumb-strip-wrap.visible{display:block}
#thumb-strip{display:flex;flex-direction:column;gap:8px;padding:8px;overflow-y:auto;overflow-x:hidden;scroll-behavior:smooth;-webkit-overflow-scrolling:touch;height:100%}
#thumb-strip::-webkit-scrollbar{width:8px}#thumb-strip::-webkit-scrollbar-thumb{background:var(--color-primary-light);border-radius:4px}#thumb-strip::-webkit-scrollbar-track{background:rgba(0,0,0,0.03)}
.t-item{position:relative;flex-shrink:0;cursor:pointer;border:2px solid var(--color-border);border-radius:var(--radius-sm);overflow:hidden;transition:border-color 0.15s;background:var(--color-bg-white)}
.t-item.has-bands::after{content:'';position:absolute;top:3px;right:3px;width:7px;height:7px;background:var(--color-primary);border-radius:50%;border:1.5px solid #fff}
.t-item.warning::before{content:'';position:absolute;bottom:2px;left:2px;width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-bottom:9px solid var(--color-warning);z-index:2;filter:drop-shadow(0 0 1px rgba(0,0,0,0.3))}
.t-item.active{border-color:var(--color-primary);box-shadow:0 0 0 2px rgba(99,102,241,0.2)}.t-item:hover:not(.active){border-color:var(--color-primary-light)}
.t-item img{display:block;width:100%;height:auto;pointer-events:none}
.t-bands{position:absolute;top:0;left:0;right:0;pointer-events:none;overflow:hidden}
.t-bands>div{position:absolute;left:0;right:0;opacity:0.35;border-top:1px solid rgba(255,255,255,0.6);border-bottom:1px solid rgba(255,255,255,0.6)}
.t-ph{height:120px;width:100%;background:var(--color-border);display:flex;align-items:center;justify-content:center}
.t-num{text-align:center;font-size:13px;color:var(--color-text-dark);font-weight:700;padding:4px 0;line-height:1}
/* ── Canvas area ── */
#canvas-area{flex:1;display:flex;flex-direction:row;min-height:0;overflow:hidden;position:relative}
#canvas-main{flex:1;display:flex;flex-direction:column;min-height:0;overflow:hidden}
.toolbar{display:flex;gap:9px;padding:10px 20px;flex-wrap:wrap;align-items:center;border-bottom:1px solid #dde3f0;background:var(--color-bg-white);box-shadow:0 2px 10px rgba(99,102,241,0.09);flex-shrink:0;position:relative}
#canvas-scroll{flex:1;overflow-x:hidden;overflow-y:auto;padding:20px;display:flex;flex-direction:column;align-items:flex-start;min-height:0}
#canvas-wrap{position:relative;display:inline-block;box-shadow:0 4px 32px rgba(99,102,241,0.12)}
#score-img{display:block;user-select:none;pointer-events:none;max-width:none}
#overlay{position:absolute;top:0;left:-40px;width:calc(100% + 40px);height:100%;cursor:crosshair;touch-action:none}
/* ── Instrument chip (toolbar) — removed, popover remains ── */

/* ── Instrument popover ── */

/* ── Band labels (left of canvas) ── */
#band-labels{position:absolute;top:0;right:calc(100% - 16px);height:100%;width:160px;pointer-events:auto;overflow:visible}
.bl-item{position:absolute;left:0;right:10px;display:flex;align-items:center;justify-content:flex-end;gap:2px;overflow:visible}
.bl-chip{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:700;font-family:var(--font-main);white-space:nowrap;padding:2px 8px 2px 5px;border-radius:5px;background:rgba(255,255,255,0.92);border:1.5px solid;line-height:1.5;cursor:pointer;outline:none;transition:box-shadow 0.12s,background 0.12s;max-width:140px;position:relative}
.bl-chip:hover{background:#fff;box-shadow:0 1px 6px rgba(99,102,241,0.15)}
.bl-chip::after{content:'';display:inline-block;width:0;height:0;border-left:3.5px solid transparent;border-right:3.5px solid transparent;border-top:4px solid currentColor;margin-left:2px;opacity:0.5}
.bl-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.bl-text{overflow:hidden;text-overflow:ellipsis}
.bl-edit{font-size:11px;font-weight:700;font-family:var(--font-main);border:1.5px solid var(--color-primary);border-radius:4px;padding:1px 5px;outline:none;width:100px;background:#fff;box-shadow:0 1px 6px rgba(99,102,241,0.2)}
.bl-dropdown{position:absolute;top:100%;right:0;margin-top:3px;min-width:150px;max-width:200px;background:#fff;border:1px solid var(--color-border);border-radius:7px;box-shadow:0 4px 16px rgba(0,0,0,0.13);z-index:200;padding:4px 0;overflow:hidden}
.bl-opt{display:flex;align-items:center;gap:6px;padding:5px 10px;cursor:pointer;font-size:11px;font-weight:600;font-family:var(--font-main);color:var(--color-text);transition:background 0.08s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bl-opt:hover{background:rgba(99,102,241,0.07)}
.bl-opt.active{background:rgba(99,102,241,0.1);color:var(--color-primary)}
.bl-opt .bl-dot{width:7px;height:7px}
.bl-sep{border:none;border-top:1px solid var(--color-border);margin:3px 0}
.bl-new{color:var(--color-primary);font-weight:700}
.bl-new::before{content:'+';margin-right:2px}
/* ── System sidebar (right of canvas) ── */
.tool-label{font-size:13px;color:var(--color-text-secondary);font-weight:600}
.tool-btn{background:var(--color-bg-white);border:1px solid var(--color-border);color:var(--color-text-secondary);font-size:13px;padding:7px 15px;border-radius:6px;cursor:pointer;font-family:var(--font-main);font-weight:600;transition:all 0.15s}
.tool-btn:hover{border-color:var(--color-primary-light);color:var(--color-primary-dark)}
.tool-btn.on{background:rgba(99,102,241,0.08);border-color:rgba(99,102,241,0.4);color:var(--color-primary-hover)}
.sep{width:1px;height:22px;background:var(--color-border);margin:0 4px}
#tool-undo,#tool-redo{width:40px;height:36px;padding:0;font-size:22px;line-height:36px;text-align:center;color:var(--color-primary);border-color:rgba(99,102,241,0.3);background:rgba(99,102,241,0.06)}
#tool-undo:not(:disabled):hover,#tool-redo:not(:disabled):hover{background:rgba(99,102,241,0.14);border-color:var(--color-primary)}
#tool-undo:disabled,#tool-redo:disabled{opacity:0.28;cursor:not-allowed}

/* ── Preview ── */
.preview-wrap{max-width:660px;width:100%;animation:fu 0.4s ease}
.prev-h{font-size:32px;color:var(--color-primary-dark);margin-bottom:8px;font-weight:800}
.prev-sub{color:var(--color-text-secondary);font-size:15px;margin-bottom:16px;line-height:1.8}
#stage-space{justify-content:center;padding:44px 22px;overflow-y:auto}
.space-wrap{max-width:860px;width:100%}
#space-preview-grid{display:flex;flex-direction:column;gap:20px;margin:16px 0 24px}
.sp-card{background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:10px;overflow:hidden;box-shadow:0 1px 4px rgba(99,102,241,0.06)}
.sp-card-header{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--color-border-light)}
.sp-card-bar{width:10px;height:22px;border-radius:3px;flex-shrink:0}
.sp-card-name{font-size:13px;font-weight:700;color:var(--color-primary-dark);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sp-card-pages{font-size:11px;color:var(--color-text-muted);white-space:nowrap}
.sp-card-body canvas{width:100%;display:block}
.sp-card-loading{height:80px;display:flex;align-items:center;justify-content:center;color:var(--color-text-muted);font-size:13px}
.sp-card-nav{display:flex;align-items:center;justify-content:center;gap:12px;padding:10px 14px;border-top:1px solid var(--color-border-light)}
.sp-card-nav.hidden{display:none}
.sp-nav-btn{background:none;border:1px solid var(--color-border);border-radius:6px;padding:4px 10px;font-size:14px;color:var(--color-primary);cursor:pointer;transition:background 0.12s,border-color 0.12s}
.sp-nav-btn:hover:not(:disabled){background:#eef2ff;border-color:var(--color-primary-light)}
.sp-nav-btn:disabled{opacity:0.3;cursor:not-allowed}
.sp-nav-lbl{font-size:12px;font-weight:700;color:var(--color-text-muted);min-width:44px;text-align:center}
.align-row{display:flex;align-items:center;gap:9px;margin-bottom:20px;font-size:14px;color:var(--color-text-secondary);cursor:pointer;user-select:none;font-weight:500}
.align-row input{accent-color:var(--color-primary);width:15px;height:15px;cursor:pointer}
#part-list{display:flex;flex-direction:column;gap:10px}
.p-card{display:flex;align-items:center;gap:14px;background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:14px 18px;transition:border-color 0.15s;box-shadow:0 1px 6px rgba(99,102,241,0.05)}
.p-card:hover{border-color:var(--color-primary-light)}
.p-bar{width:5px;height:40px;border-radius:3px;flex-shrink:0}
.p-info{flex:1}.p-name{font-weight:700;font-size:16px;color:var(--color-primary-dark)}.p-meta{font-size:13px;color:var(--color-text-secondary);margin-top:2px}

/* ── Loading overlay ── */
#loading-overlay{position:fixed;inset:0;background:rgba(238,242,255,0.85);display:flex;align-items:center;justify-content:center;z-index:999;backdrop-filter:blur(4px)}
.load-box{background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:14px;padding:28px 44px;text-align:center;box-shadow:0 8px 32px rgba(99,102,241,0.12)}
.spinner{width:34px;height:34px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;margin:0 auto;animation:spin 0.7s linear infinite}
.load-box p{margin-top:14px;font-size:14px;color:var(--color-text-secondary);font-weight:500}
#load-progress-wrap{margin-top:14px;display:none}
#load-bar-track{background:var(--color-border);border-radius:99px;height:5px;overflow:hidden}
#load-bar{background:linear-gradient(90deg,var(--color-primary),#818cf8);height:100%;width:0%;border-radius:99px;transition:width 0.35s ease}
#load-progress-txt{font-size:12px;color:var(--color-text-muted);margin-top:6px;font-weight:600;text-align:center}
/* Background load bar (after first page) */
#bg-load-wrap{height:3px;background:transparent;overflow:hidden;flex-shrink:0;display:none}
#bg-load-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),#818cf8);width:0%;transition:width 0.35s ease}


/* ── Spacing control ── */
#spacing-control{background:var(--color-bg);border:1px solid var(--color-border);border-radius:10px;padding:14px 16px;margin-bottom:14px}
.spacing-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.spacing-header>span{font-size:13px;font-weight:600;color:var(--color-text-dark)}
#spacing-val{font-size:12px;font-weight:700;color:var(--color-primary);background:#eef2ff;padding:2px 9px;border-radius:10px}
#gap-slider{width:100%;accent-color:var(--color-primary);cursor:pointer;margin-bottom:12px;display:block}

/* ── Tips widget ── */
#ctx-banner{position:absolute;top:12px;left:50%;transform:translateX(-50%);background:rgba(99,102,241,0.92);color:#fff;border-radius:10px;padding:10px 40px 10px 16px;font-size:13px;font-weight:500;line-height:1.5;z-index:480;box-shadow:0 4px 16px rgba(99,102,241,0.25);white-space:nowrap;animation:fu 0.3s ease;pointer-events:auto}
#ctx-banner.hidden{display:none}
#ctx-banner-close{position:absolute;top:6px;right:8px;background:none;border:none;color:rgba(255,255,255,0.7);font-size:16px;cursor:pointer;line-height:1;padding:2px 4px}
#ctx-banner-close:hover{color:#fff}
/* ── Clear dropdown ── */
.clear-wrap{position:relative}
.clear-dropdown{position:fixed;background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:0 4px 20px rgba(99,102,241,0.12);z-index:200;min-width:180px;overflow:hidden}
.clear-dropdown.hidden{display:none}
.clear-dropdown button{display:block;width:100%;text-align:left;padding:9px 14px;background:none;border:none;font-size:13px;font-weight:600;color:var(--color-text-secondary);cursor:pointer;font-family:var(--font-main);transition:background 0.1s}
.clear-dropdown button:hover{background:#fef2f2;color:var(--color-danger)}
/* ── Undo/Redo ── */
#tool-undo:disabled,#tool-redo:disabled{opacity:0.3;cursor:not-allowed}
/* ── Generic dialog ── */
#dlg-modal{display:none;position:fixed;inset:0;background:rgba(99,102,241,0.15);z-index:1010;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
#dlg-modal.open{display:flex}
#dlg-box{background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:14px;padding:24px 28px;max-width:340px;width:calc(100% - 40px);box-shadow:0 8px 40px rgba(99,102,241,0.14)}
#dlg-msg{font-size:15px;color:var(--color-primary-dark);line-height:1.6;margin:0 0 4px}
#dlg-input{width:100%;border:1px solid var(--color-primary-light);border-radius:6px;padding:8px 10px;font-size:14px;font-family:var(--font-main);color:var(--color-primary-dark);margin-top:12px;box-sizing:border-box;outline:none;transition:border-color 0.15s}
#dlg-input:focus{border-color:var(--color-primary)}


/* ── Responsive: steps to secondary bar (≤ 900px) ── */
@media(max-width:900px){
  #steps-desktop{display:none}
  .steps-bar{display:flex;justify-content:center}
  .steps-bar .step.active{box-shadow:none}
}

/* ── Responsive: tablet (≤ 768px) ── */
@media(max-width:768px){
  #header{padding:0 16px}
  .toolbar{padding:8px 14px;gap:7px}
  .tool-btn{padding:6px 11px;font-size:12px}
  .upload-card{padding:32px 28px}
  #stage-preview{padding:28px 16px}
  .prev-h{font-size:26px}
}

/* ── Responsive: mobile (≤ 600px) ── */
@media(max-width:600px){
  /* Header */
  #header{padding:0 14px;height:46px}
  .logo img{height:26px}
  .support-btn span{display:none}
  .support-btn{padding:5px 8px;font-size:16px;gap:0}
  .site-nav{top:46px;left:0;right:0;min-width:auto}

  /* Mobile steps bar */
  .steps-bar .step{font-size:11px;padding:5px 10px;margin-right:14px}
  .steps-bar .step:last-child{margin-right:0}
  .steps-bar .steps-flow .step:not(:last-child)::after{right:-11px;font-size:12px}

  /* Upload */
  #stage-upload{padding:20px 16px;align-items:stretch;justify-content:flex-start}
  .upload-layout{padding:16px 0}
  .demo-video-wrap{max-width:100%}
  .upload-card{padding:28px 20px;border-radius:14px;max-width:100%}
  .upload-card h2{font-size:18px}
  .sub{font-size:14px;margin-bottom:20px}

  /* Stage label — portrait layout */
  #stage-label{position:relative}
  #canvas-area{flex-direction:column}
  #thumb-strip-wrap.visible{display:flex;width:auto;border-right:none;border-top:1px solid var(--color-border);order:2;height:72px;overflow:hidden}
  #thumb-strip{flex-direction:row;overflow-x:auto;overflow-y:hidden;height:100%;gap:6px;padding:6px}
  .t-item{width:52px;flex-shrink:0}
  .t-num{font-size:10px;padding:2px 0}
  .toolbar{padding:5px 8px;gap:4px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .toolbar::-webkit-scrollbar{display:none}
  .tool-btn{padding:5px 8px;font-size:11px}
  .tool-label{display:none}
  .sep{margin:0 1px;height:18px}

  /* Preview */
  #stage-preview{padding:20px 14px}
  .prev-h{font-size:22px}
  .prev-sub{font-size:14px}
  .p-card{padding:12px 14px;gap:10px}
  .p-name{font-size:14px}

  /* Modals */
  #dlg-box{padding:20px 18px}
}
/* ── Help modal ── */
#help-modal{display:none;position:fixed;inset:0;background:rgba(99,102,241,0.15);z-index:1010;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
#help-modal.open{display:flex}
#help-box{background:var(--color-bg-white);border:1px solid var(--color-border);border-radius:14px;padding:24px 28px;max-width:480px;width:calc(100% - 40px);box-shadow:0 8px 40px rgba(99,102,241,0.14);position:relative;max-height:90vh;overflow-y:auto}
#help-box h3{font-size:16px;font-weight:700;color:var(--color-primary-dark);margin:0 0 16px}
.help-row{display:flex;align-items:center;gap:14px;padding:8px 0;border-bottom:1px solid var(--color-border-light)}
.help-row:last-child{border-bottom:none}
.help-icon{flex-shrink:0;min-width:76px;display:flex;align-items:center;gap:4px}
.help-icon .tool-btn{pointer-events:none;font-size:12px;padding:5px 9px}
.help-kbd{display:inline-block;background:var(--color-border-light);border:1px solid var(--color-primary-light);border-radius:4px;font-size:12px;font-weight:700;color:var(--color-primary-dark);padding:2px 7px;font-family:monospace}
.help-desc{font-size:13px;color:var(--color-text-dark);line-height:1.5;flex:1}
/* ── Site footer (removed) ── */
#canvas-scroll{padding-bottom:10px}
.stage{padding-bottom:34px}
#stage-label{padding-bottom:0}
/* ── Changelog modal ── */
#changelog-modal{display:none;position:fixed;inset:0;background:rgba(99,102,241,0.15);z-index:1010;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
#changelog-modal.open{display:flex}
#changelog-box{background:var(--color-bg-white);border-radius:16px;padding:28px 32px;max-width:540px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:0 8px 40px rgba(99,102,241,0.18);position:relative}
#changelog-box h3{font-size:20px;font-weight:800;color:var(--color-primary-dark);margin:0 0 20px;padding-right:32px}
.cl-version{margin-bottom:22px}.cl-version:last-child{margin-bottom:0}
.cl-ver-header{display:flex;align-items:baseline;gap:10px;margin-bottom:8px}
.cl-ver-num{font-size:13px;font-weight:800;color:var(--color-primary);background:#eef2ff;padding:2px 10px;border-radius:20px}
.cl-ver-date{font-size:12px;color:var(--color-text-muted);font-weight:500}
.cl-items{list-style:none;padding:0;margin:0}
.cl-items li{font-size:13px;color:var(--color-text-dark);line-height:1.7;padding:2px 0 2px 16px;position:relative}
.cl-items li::before{content:'·';position:absolute;left:4px;color:var(--color-primary);font-weight:700}
}