:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #667085;
  --border: #dde2ea;
  --primary: #1e6fd9;
  --primary-hover: #185bb3;
  --primary-text: #ffffff;
  --accent-bg: #eaf2fd;
  --danger: #c93636;
  --alert-bg: #fdecec;
  --alert-text: #9b2323;
  --warn-bg: #fff6e0;
  --warn-text: #7a5300;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --card: #1b2129;
    --text: #e6eaf0;
    --muted: #98a2b3;
    --border: #2d3540;
    --primary: #4b92f0;
    --primary-hover: #6aa6f3;
    --primary-text: #0d1117;
    --accent-bg: #1c2a3d;
    --danger: #ef6b6b;
    --alert-bg: #3a1e1e;
    --alert-text: #ffb4b4;
    --warn-bg: #3a2f14;
    --warn-text: #ffd98a;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

.site-header {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

.logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.logo-mark { margin-right: 6px; }

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 8px 16px 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.card.narrow { max-width: 440px; margin-left: auto; margin-right: auto; }
.center { text-align: center; }

h1 { font-size: 1.35rem; margin: 0 0 8px; }

.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

code {
  background: var(--accent-bg);
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

/* ボタン */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover { border-color: var(--primary); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }

.link-btn {
  background: none;
  border: none;
  color: var(--muted);
  font: inherit;
  font-size: 0.875rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 4px;
}

.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

/* フォーム */
.login-form { display: grid; gap: 10px; margin-top: 16px; }

label, .field-label { font-weight: 600; font-size: 0.9rem; }
.field-label { display: block; margin-top: 16px; margin-bottom: 4px; }

input[type="password"], input[type="text"], textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 16px; /* iOS のズーム防止 */
}

textarea { resize: vertical; }

select { max-width: 200px; cursor: pointer; }

.field-note { margin: 4px 0 0; }

input:focus, textarea:focus, select:focus, .drop:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.logout-form { text-align: right; }

/* アップロード欄 */
.drop {
  margin-top: 16px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.drop:hover, .drop.dragover { border-color: var(--primary); background: var(--accent-bg); }
.drop.disabled { pointer-events: none; opacity: 0.5; }
.drop-icon { font-size: 1.8rem; color: var(--primary); }
.drop-main { font-weight: 600; }
.drop-sub { color: var(--muted); font-size: 0.875rem; }

.file-list, .download-list { list-style: none; margin: 16px 0 0; padding: 0; }

.file-list li, .download-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.file-info { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.file-name { overflow-wrap: anywhere; font-weight: 600; }
.file-size { color: var(--muted); font-size: 0.85rem; }
.file-state { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.file-state.ok { color: var(--primary); }

.remove-btn {
  border: none;
  background: none;
  color: var(--muted);
  font-size: 1.3rem;
  line-height: 1;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
}

.remove-btn:hover { background: var(--alert-bg); color: var(--danger); }

/* 進み具合 */
.progress-wrap { margin-top: 16px; }

.progress {
  height: 10px;
  border-radius: 999px;
  background: var(--accent-bg);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0;
  background: var(--primary);
  transition: width 0.2s;
}

/* お知らせ */
.alert {
  background: var(--alert-bg);
  color: var(--alert-text);
  padding: 10px 14px;
  border-radius: 10px;
  margin: 16px 0 0;
}

#upload-error { white-space: pre-line; }

.alert.warn { background: var(--warn-bg); color: var(--warn-text); margin: 0 0 16px; }
.alert.warn p { margin: 0 0 10px; }

.message {
  background: var(--accent-bg);
  border-radius: 10px;
  padding: 12px 14px;
  margin: 12px 0 4px;
  overflow-wrap: anywhere;
}

/* 結果 */
.url-box { display: flex; gap: 8px; margin-top: 8px; }
.url-box input { flex: 1; min-width: 0; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 15px; }

.delete-info { margin-top: 20px; }
.delete-info summary { cursor: pointer; color: var(--muted); font-size: 0.9rem; }

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 8px 16px 32px;
}

@media (max-width: 480px) {
  .card { padding: 18px; }
  .download-list li { flex-wrap: wrap; }
  .download-list .btn { width: 100%; }
  .url-box { flex-direction: column; }
}