:root{--accent-a: #ff2f6d;--accent-b: #00d4ff;--ink: #111827;--muted: #64748b;--paper: #f8fafc;--line: #d8deea;--bar-h: 92px;font-family:SF Pro Text,SF Pro Display,Avenir Next,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;color:var(--ink);background:linear-gradient(160deg,rgba(255,47,109,.16),transparent 30%),linear-gradient(20deg,rgba(0,212,255,.18),transparent 34%),#f8fafc}body.modal-open{overflow:hidden}button,input,summary{font:inherit}button{-webkit-tap-highlight-color:transparent}#app{min-height:100vh}.app{min-height:100vh;padding:14px 12px calc(var(--bar-h) + 18px + env(safe-area-inset-bottom))}.app-header{display:grid;gap:2px;margin-bottom:10px}.brand{margin:0;font-size:28px;font-weight:900;letter-spacing:0}.tagline{margin:0;color:var(--muted);font-size:13px;font-weight:700}.preview-shell{position:relative;border-radius:18px;overflow:hidden;background:#e7ecf4;border:1px solid var(--line);box-shadow:0 16px 36px #0f172a1f}.compare-stage{position:relative;min-height:min(68vh,720px);overflow:hidden;background:linear-gradient(135deg,rgba(255,255,255,.55),transparent 40%),linear-gradient(135deg,var(--accent-a),var(--accent-b));touch-action:none}.preview-canvas{width:100%;height:auto;display:block}.after-layer{position:absolute;top:0;right:0;bottom:0;left:0;clip-path:inset(0 0 0 0)}.split-line{position:absolute;top:0;bottom:0;left:100%;width:2px;background:#0f172aad;box-shadow:0 0 0 1px #ffffffd1;transform:translate(-1px);pointer-events:none;opacity:0;cursor:ew-resize}.has-image .split-line{pointer-events:auto;opacity:1}.split-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:auto;width:34px;height:34px;border-radius:999px;border:1px solid rgba(15,23,42,.2);background:#fffffff5;color:#0f172a;font-size:17px;line-height:1;cursor:ew-resize}.empty-state{position:absolute;top:0;right:0;bottom:0;left:0;z-index:8;display:grid;place-content:center;gap:14px;padding:28px;text-align:center;background:radial-gradient(circle at 20% 18%,rgba(255,255,255,.42),transparent 32%),linear-gradient(135deg,#ff2f6dd9,#00d4ffe0)}.empty-state.hidden{display:none}.empty-state p{margin:0;color:#fff;font-size:20px;font-weight:900;text-shadow:0 1px 12px rgba(15,23,42,.28)}.hero-cta{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;border-radius:16px;background:#fff;color:#111827;min-width:min(72vw,320px);height:58px;padding:0 24px;font-size:17px;font-weight:900;cursor:pointer;box-shadow:0 12px 28px #0f172a38}.art-title{position:absolute;top:10px;left:10px;right:10px;z-index:7;margin:0;font-size:12px;font-weight:800;color:#0f172a;background:#ffffffd1;border:1px solid rgba(15,23,42,.08);border-radius:10px;padding:8px 10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hidden-input{display:none}.is-hidden{display:none!important}.action-bar{position:fixed;left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom));z-index:20;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;background:#f8fafcf0;border:1px solid rgba(15,23,42,.1);border-radius:16px;padding:8px;box-shadow:0 10px 24px #0f172a24;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.action-btn,.sheet-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid rgba(15,23,42,.14);border-radius:12px;background:#fff;color:var(--ink);font-size:13px;font-weight:800;height:46px;padding:0 12px;cursor:pointer}.action-btn.primary,.sheet-btn.primary{border:none;background:linear-gradient(135deg,var(--accent-a),var(--accent-b));color:#061127}.action-btn:disabled,.sheet-btn:disabled{opacity:.45;cursor:not-allowed}.sheet-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:30;background:#0f172a5c;opacity:0;pointer-events:none;transition:opacity .16s ease}.sheet-overlay.visible{opacity:1;pointer-events:auto}.sheet{position:fixed;left:0;right:0;bottom:0;z-index:40;background:#f8fafc;border-radius:18px 18px 0 0;border-top:1px solid rgba(15,23,42,.12);transform:translateY(108%);transition:transform .18s ease;max-height:min(86vh,760px);display:grid;grid-template-rows:auto 1fr}.color-sheet{max-height:min(82vh,620px)}.sheet.visible{transform:translateY(0)}.sheet-header{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid rgba(15,23,42,.08)}.sheet-title{margin:0;font-size:15px;font-weight:900}.sheet-close,.sns-close{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid rgba(15,23,42,.16);border-radius:999px;background:#fff;color:var(--ink);width:32px;height:32px;font-size:21px;line-height:1;cursor:pointer}.sheet-body{overflow:auto;padding:12px}.sheet-section{margin-bottom:14px}.section-title{margin:0 0 8px;font-size:12px;font-weight:800;color:#334155}.preset-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.preset-card{-webkit-appearance:none;-moz-appearance:none;appearance:none;min-height:70px;border:1px solid rgba(15,23,42,.14);border-radius:14px;background:#fff;color:var(--ink);padding:8px;display:grid;grid-template-columns:42px 1fr;gap:9px;align-items:center;text-align:left;cursor:pointer}.preset-card.active{border-color:#0f172a94;box-shadow:inset 0 0 0 2px #0f172a1f}.preset-card strong{min-width:0;font-size:14px;font-weight:900}.preset-swatch{width:42px;height:42px;border-radius:999px;background:linear-gradient(135deg,var(--swatch-a),var(--swatch-b));box-shadow:inset 0 0 0 1px #0f172a29}.advanced-panel{border-top:1px solid rgba(15,23,42,.08);margin:4px 0 12px;padding-top:10px}.advanced-panel summary{cursor:pointer;color:#334155;font-size:13px;font-weight:800;list-style-position:inside}.advanced-body{display:grid;gap:8px;margin-top:10px}.palette-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.palette-card{min-height:86px;border-radius:14px;border:1px solid rgba(15,23,42,.14);padding:10px;display:grid;grid-template-columns:1fr auto;gap:2px 8px;align-items:center}.palette-card span{font-size:12px;font-weight:800;opacity:.85}.palette-card input[type=color]{grid-row:span 2;width:38px;height:38px;border:none;padding:0;background:transparent}.palette-card strong{min-width:0;overflow-wrap:anywhere;font-size:16px;line-height:1}.row{display:flex;gap:8px;flex-wrap:wrap}.row .sheet-btn{flex:1 1 0}.sheet-btn.is-active{border:none;background:linear-gradient(140deg,#dbeafe,#bfdbfe);color:#0b1220}.slider-wrap{width:100%;display:grid;gap:4px;background:#ffffffeb;border:1px solid rgba(15,23,42,.1);border-radius:12px;padding:8px 10px}.slider-wrap span{font-size:12px;font-weight:800}.slider-wrap input[type=range]{width:100%}.status{margin:10px 2px 0;min-height:18px;font-size:12px;color:#475569}.sns-modal{position:fixed;top:0;right:0;bottom:0;left:0;display:none;align-items:center;justify-content:center;z-index:1000}.sns-modal.visible{display:flex}.sns-modal-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#07132b8f}.sns-modal-dialog{position:relative;width:min(430px,calc(100vw - 24px));background:#fff;border-radius:16px;border:1px solid rgba(15,23,42,.12);box-shadow:0 16px 42px #07132b4d;padding:16px}.sns-close{position:absolute;right:8px;top:8px}.sns-title{margin:0 38px 6px 0;font-size:18px;font-weight:900}.sns-note{margin:0 0 10px;font-size:13px;color:#475569}.copy-panel{border:1px solid rgba(15,23,42,.1);border-radius:12px;background:#f8fafc;padding:10px;margin-bottom:10px}.copy-panel p{margin:0;font-size:13px;line-height:1.6;overflow-wrap:anywhere}.sns-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}@media (min-width: 900px){:root{--bar-h: 92px}.app{max-width:980px;margin:0 auto;padding:18px 16px calc(var(--bar-h) + 28px)}.preview-shell{min-height:74vh}.compare-stage{min-height:72vh}.action-bar{left:calc(50% - 470px);right:calc(50% - 470px)}.sheet{left:50%;transform:translate(-50%,108%);width:min(620px,96vw);right:auto}.sheet.visible{transform:translate(-50%)}.preset-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}