/* okao — mobile-first. Warm, paper-like, no gradients: the product promise is
   "not over-processed", so the chrome must not look like a filter. */
:root{
  --bg:#faf7f4; --ink:#241f1c; --muted:#7d726b; --line:#e7dfd8;
  --accent:#8c5a4a; --accent-ink:#fff; --card:#fff;
  --safe-t:env(safe-area-inset-top,0px); --safe-b:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:16px/1.7 "Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",
       -apple-system,BlinkMacSystemFont,"Yu Gothic",Meiryo,sans-serif;
  padding:calc(var(--safe-t) + 0px) 0 calc(var(--safe-b) + 32px);
}
.hd{padding:28px 20px 8px;text-align:center}
.hd__logo{font-size:30px;letter-spacing:.16em;font-weight:600}
.hd__tag{margin:6px 0 0;color:var(--muted);font-size:13.5px}

main{padding:0 16px;max-width:560px;margin:0 auto}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;
      padding:16px;margin:14px 0}

/* picker */
/* Now a <button>: reset the UA styling it would otherwise impose. */
.drop{display:flex;flex-direction:column;align-items:center;gap:6px;
      width:100%;font:inherit;color:inherit;appearance:none;background:transparent;
      padding:34px 16px;border:1.5px dashed var(--line);border-radius:12px;
      cursor:pointer;text-align:center}
.drop:active{background:#f6f1ec}
.drop.over{background:#f6f1ec;border-color:var(--accent)}
/* Visually hidden but still RENDERED: a file input that is not rendered is one
   Safari will not open, so display:none is the wrong tool here. */
.vhidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;border:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.drop__icon{font-size:26px;color:var(--accent);line-height:1}
.drop__title{font-weight:600}
.drop__hint{color:var(--muted);font-size:13px}

/* preview */
.frame{position:relative;border-radius:12px;overflow:hidden;background:#f1ece7;
       display:flex;align-items:center;justify-content:center;min-height:180px}
.frame img{display:block;width:100%;height:auto}
.spinner{position:absolute;inset:0;display:grid;place-items:center;background:rgba(255,255,255,.55)}
.spinner span{width:26px;height:26px;border:2.5px solid var(--line);
              border-top-color:var(--accent);border-radius:50%;
              animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spinner span{animation-duration:2.4s}}

.compare{margin-top:10px;width:100%;padding:11px;border-radius:10px;
         border:1px solid var(--line);background:#fff;color:var(--muted);
         font:inherit;font-size:13.5px}
.compare:active{background:#f6f1ec}

/* control */
.ctrl{margin-top:18px}
.ctrl__row{display:flex;justify-content:space-between;align-items:baseline}
.ctrl__row label{font-weight:600}
.ctrl__row output{font-variant-numeric:tabular-nums;color:var(--accent);font-weight:600}
input[type=range]{width:100%;margin:12px 0 6px;-webkit-appearance:none;
                  appearance:none;background:transparent}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;
  margin-top:-12px;border-radius:50%;background:var(--accent);
  border:3px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.22)}
input[type=range]::-moz-range-track{height:4px;border-radius:2px;background:var(--line)}
input[type=range]::-moz-range-thumb{width:22px;height:22px;border:3px solid #fff;
  border-radius:50%;background:var(--accent)}
.ctrl__help{margin:0;color:var(--muted);font-size:12.5px}

.msg{margin:12px 0 0;padding:10px 12px;border-radius:10px;font-size:13.5px;
     background:#fdf2f0;color:#8a3a2c;border:1px solid #f3dcd6}

.actions{display:flex;gap:10px;margin-top:16px}
.btn{flex:1;text-align:center;padding:13px;border-radius:11px;border:1px solid var(--line);
     background:#fff;color:var(--ink);text-decoration:none;font:inherit;font-weight:600;
     cursor:pointer;-webkit-tap-highlight-color:transparent}
.btn--primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn:active{transform:translateY(1px)}

.stats{display:flex;gap:16px;margin:16px 0 0;padding-top:12px;border-top:1px solid var(--line);
       flex-wrap:wrap;font-size:12px;color:var(--muted)}
.stats div{display:flex;gap:5px;margin:0}
.stats dt,.stats dd{margin:0}
.stats dd{font-variant-numeric:tabular-nums;color:var(--ink)}

/* promise block */
.note{background:transparent;border:0;padding:8px 4px 20px}
.note h2{font-size:14px;letter-spacing:.05em;color:var(--muted);font-weight:600;margin:0 0 10px}
.note ul{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.note li{position:relative;padding-left:22px;font-size:13.5px;color:#4a423d}
.note li::before{content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:700}
.ft{text-align:center;color:#b6aaa2;font-size:11.5px;padding:8px 0 4px}