:root {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #66737f;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #e8f0fe;
  --border: #e2e8f0;
  --danger: #dc2626;
  --ok: #16a34a;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.05);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 920px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { font-weight: 700; font-size: 1.15rem; color: var(--text); }
.brand span { color: var(--primary); }
.nav a { margin-left: 18px; color: var(--muted); font-size: .92rem; }

/* Hero */
.hero { text-align: center; padding: 56px 20px 32px; }
.hero h1 { font-size: 1.9rem; margin: 0 0 12px; }
.hero p { color: var(--muted); margin: 0; font-size: 1.05rem; }

/* Tool cards */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin: 28px 0;
}
.tool-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform .12s ease, box-shadow .12s ease;
  color: var(--text);
}
.tool-card:hover { transform: translateY(-2px); text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,.08), 0 14px 32px rgba(0,0,0,.07); }
.tool-card .icon { font-size: 1.8rem; margin-bottom: 8px; }
.tool-card h3 { margin: 6px 0; font-size: 1.1rem; }
.tool-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.tool-card.soon { opacity: .55; pointer-events: none; }
.badge-soon {
  display: inline-block; font-size: .7rem; background: var(--border);
  color: var(--muted); border-radius: 999px; padding: 2px 8px; margin-left: 6px;
}

/* Generic card / tool UI */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin: 22px 0;
}

.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tab {
  flex: 1; text-align: center; padding: 10px; cursor: pointer;
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
  font-weight: 600; color: var(--muted);
}
.tab.active { background: var(--primary-soft); border-color: var(--primary);
  color: var(--primary-dark); }

.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 40px 20px; text-align: center; color: var(--muted);
  cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--primary); background: var(--primary-soft);
}
.dropzone strong { color: var(--primary); }

.file-list { list-style: none; margin: 18px 0 0; padding: 0; }
.file-item {
  display: flex; align-items: center; gap: 10px;
  background: #fafbfc; border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; margin-bottom: 8px;
}
.file-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis;
  white-space: nowrap; font-size: .92rem; }
.file-item .meta { color: var(--muted); font-size: .8rem; }
.file-item .handle { cursor: grab; color: var(--muted); }
.icon-btn {
  border: none; background: none; cursor: pointer; color: var(--muted);
  font-size: 1rem; padding: 4px 6px; border-radius: 6px;
}
.icon-btn:hover { background: var(--border); color: var(--danger); }

.btn {
  display: inline-block; background: var(--primary); color: #fff;
  border: none; border-radius: 10px; padding: 12px 22px; font-size: 1rem;
  font-weight: 600; cursor: pointer; transition: background .15s;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { background: #9db4e0; cursor: not-allowed; }
.btn-row { margin-top: 20px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

.field { margin: 16px 0; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .92rem; }
.field input[type="text"] {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 1rem;
}
.hint { color: var(--muted); font-size: .85rem; margin-top: 4px; }

.status { margin-top: 16px; font-size: .92rem; min-height: 1.4em; }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }

.note {
  background: var(--primary-soft); border: 1px solid #c7dbfd;
  border-radius: 10px; padding: 12px 16px; font-size: .88rem; color: #1e3a8a;
  margin: 16px 0;
}

/* Ad slots */
.ad-slot {
  margin: 26px 0; min-height: 90px; display: flex; align-items: center;
  justify-content: center; color: #b7c0cc; font-size: .8rem;
  background: repeating-linear-gradient(45deg, #f0f3f7, #f0f3f7 10px, #f5f7fa 10px, #f5f7fa 20px);
  border: 1px dashed var(--border); border-radius: 10px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border); margin-top: 48px;
  padding: 28px 20px; text-align: center; color: var(--muted); font-size: .85rem;
  background: var(--card);
}
.site-footer a { margin: 0 10px; color: var(--muted); }

/* Legal pages */
.prose h1 { font-size: 1.6rem; }
.prose h2 { font-size: 1.2rem; margin-top: 28px; border-left: 4px solid var(--primary);
  padding-left: 10px; }
.prose { background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); margin: 22px 0; }