:root {
  --dark: #18181b;
  --indigo: #4f46e5;
  --indigo-pale: #eef2ff;
  --teal: #0d9488;
  --bg: #f4f4f5;
  --border: #e4e4e7;
  --radius: 14px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif; background: var(--bg); color: var(--dark); line-height: 1.65; }
.container { max-width: 1040px; margin: 0 auto; padding: 0 18px; }
.hidden { display: none !important; }

.u-header { background: var(--dark); color: #fff; padding: 24px 0; }
.u-badge { background: var(--indigo); color: #fff; font-size: .74rem; font-weight: 800; padding: 3px 10px; border-radius: 999px; }
.u-header h1 { margin: 6px 0 4px; font-size: 1.7rem; }
.u-header p { margin: 0; font-size: .88rem; color: #a1a1aa; }
.pr-tag { font-size: .68rem; background: rgba(255,255,255,.15); padding: 1px 7px; border-radius: 4px; margin-left: 6px; }

.u-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 20px; }
.u-tab {
  background: #fff; border: 2px solid var(--border); border-radius: 12px; padding: 12px;
  font-weight: 800; font-size: .92rem; cursor: pointer; color: var(--dark); transition: .15s;
}
.u-tab.active { border-color: var(--indigo); background: var(--indigo-pale); color: var(--indigo); }

.u-main { padding: 20px 18px 60px; }
.u-panel { display: none; }
.u-panel.active { display: block; }
.u-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: 0 4px 12px rgba(0,0,0,.04); }
.u-card h2 { margin: 0 0 6px; font-size: 1.25rem; }
.u-desc { margin: 0 0 16px; font-size: .86rem; color: #52525b; }

textarea {
  width: 100%; border: 2px solid var(--border); border-radius: 12px; padding: 14px;
  font-family: inherit; font-size: 1rem; resize: vertical; line-height: 1.6;
}
textarea:focus { outline: none; border-color: var(--indigo); }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 16px 0; }
.stat-box { background: #fafafa; border: 1px solid var(--border); border-radius: 10px; padding: 12px; display: flex; flex-direction: column; }
.stat-box span { font-size: .74rem; color: #71717a; font-weight: 700; }
.stat-box strong { font-size: 1.35rem; margin-top: 2px; color: var(--indigo); }

.action-bar { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-primary { background: var(--indigo); color: #fff; border: none; border-radius: 10px; padding: 11px 20px; font-weight: 800; cursor: pointer; font-size: .9rem; }
.btn-sub { background: #fff; border: 1px solid #d4d4d8; border-radius: 10px; padding: 10px 16px; font-weight: 700; cursor: pointer; }

.split-results { margin-top: 18px; display: flex; flex-direction: column; gap: 10px; }
.tweet-chunk { background: var(--indigo-pale); border: 1px solid #c7d2fe; border-radius: 10px; padding: 12px; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.tweet-chunk pre { margin: 0; white-space: pre-wrap; font-family: inherit; font-size: .9rem; flex: 1; }

.img-controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; align-items: center; }
.file-drop {
  border: 2px dashed var(--indigo); background: var(--indigo-pale); border-radius: 12px;
  padding: 16px; text-align: center; font-weight: 800; color: var(--indigo); cursor: pointer;
}
.file-drop input { display: none; }
.ctrl-item { display: flex; flex-direction: column; gap: 4px; font-size: .84rem; font-weight: 700; }
.ctrl-item select, .ctrl-item input[type=number] { padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: .9rem; }

.img-result-box { margin-top: 20px; background: #f0fdf4; border: 2px solid #86efac; border-radius: 12px; padding: 18px; text-align: center; }
.img-compare-stats { display: flex; justify-content: center; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 12px; font-size: .95rem; }
.after-stat strong { color: var(--teal); font-size: 1.2rem; }

.ratio-input-row { margin-bottom: 16px; font-weight: 800; }
.ratio-input-row input { padding: 8px 12px; border: 2px solid var(--indigo); border-radius: 8px; font-size: 1rem; font-weight: 800; width: 140px; }

.monetize-box { margin-top: 26px; background: #fff; border: 2px solid #fde68a; border-radius: var(--radius); padding: 20px; }
.monetize-box h3 { margin: 0 0 12px; font-size: 1.05rem; }
.aff-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; }
.aff-item { border: 1px solid var(--border); border-radius: 12px; padding: 14px; text-decoration: none; color: var(--dark); display: flex; flex-direction: column; gap: 5px; background: #fafafa; }
.aff-pill { align-self: flex-start; background: #fef3c7; color: #b45309; font-size: .7rem; font-weight: 800; padding: 2px 8px; border-radius: 999px; }
.aff-item p { margin: 0; font-size: .82rem; color: #52525b; flex: 1; }
.aff-link { font-size: .82rem; font-weight: 800; color: var(--indigo); }

.u-footer { text-align: center; font-size: .76rem; color: #71717a; padding: 24px 0 40px; }
@media (max-width: 720px) { .u-tabs { grid-template-columns: 1fr; } }