/* ===== Design tokens ===== */
:root {
  --accent: #2f6feb;
  --accent-hover: #1f5bd6;
  --accent-soft: #eaf1ff;
  --danger: #d1483a;
  --success: #2f9e5c;

  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-alt: #f0f1f4;
  --border: #e2e4e9;
  --text: #16181d;
  --text-muted: #5b6169;
  --shadow: 0 1px 2px rgba(16, 20, 30, 0.04), 0 8px 24px rgba(16, 20, 30, 0.06);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --logo-filter: none;
}

:root[data-theme="dark"] {
  --accent: #7fa8ff;
  --accent-hover: #9bbcff;
  --accent-soft: #1c2a47;
  --danger: #ff7a6d;
  --success: #57cf91;

  --bg: #0c0e12;
  --surface: #171b23;
  --surface-alt: #1e2430;
  --border: #333b4a;
  --text: #f3f5f9;
  --text-muted: #aeb6c4;
  --shadow: 0 0 0 1px rgba(255, 255, 255, 0.045), 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 12px 32px rgba(0, 0, 0, 0.55);
  --logo-filter: invert(1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #7fa8ff;
    --accent-hover: #9bbcff;
    --accent-soft: #1c2a47;
    --danger: #ff7a6d;
    --success: #57cf91;

    --bg: #0c0e12;
    --surface: #171b23;
    --surface-alt: #1e2430;
    --border: #333b4a;
    --text: #f3f5f9;
    --text-muted: #aeb6c4;
    --shadow: 0 0 0 1px rgba(255, 255, 255, 0.045), 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 12px 32px rgba(0, 0, 0, 0.55);
    --logo-filter: invert(1);
  }
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

body {
  margin: 0;
  overflow-x: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Noto Sans SC", "PingFang SC", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: var(--accent); }

button {
  font: inherit;
  cursor: pointer;
}

/* ===== Layout shell ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand img {
  height: 28px;
  width: auto;
  filter: var(--logo-filter);
}

.brand-name {
  font-weight: 700;
  font-size: 1.02rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.icon-btn:hover { background: var(--surface-alt); }
.icon-btn svg { width: 18px; height: 18px; }

.select-wrap {
  position: relative;
}
.select-wrap select {
  appearance: none;
  font: inherit;
  padding: 8px 30px 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  height: 38px;
}
.select-wrap::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}

.hero {
  position: relative;
  text-align: center;
  padding: 28px 12px 8px;
}
.hero::before {
  content: "";
  position: absolute;
  top: -60px;
  left: 10%;
  right: 10%;
  height: 280px;
  background:
    radial-gradient(45% 70% at 30% 20%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 70%),
    radial-gradient(40% 60% at 75% 35%, color-mix(in srgb, var(--success) 14%, transparent), transparent 70%);
  filter: blur(20px);
  z-index: -1;
  pointer-events: none;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  color: var(--text);
}
@supports (background-clip: text) or (-webkit-background-clip: text) {
  .hero h1 {
    background: linear-gradient(100deg, var(--text) 30%, var(--accent) 90%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}
.hero p {
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.55;
}
.hero .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
}

/* ===== Tool grid ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}
@media (max-width: 820px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
  text-align: left;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow), 0 0 0 1px var(--accent);
}
.tool-card .tool-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
.tool-card:hover .tool-icon {
  background: var(--accent);
  color: #fff;
  transform: scale(1.06);
}
.tool-card .tool-icon svg { width: 22px; height: 22px; }
.tool-card h3 {
  margin: 0;
  font-size: 1.02rem;
}
.tool-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.4;
}

/* ===== Tool panels ===== */
.panel {
  display: none;
  margin-top: 26px;
  padding: 22px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.panel.active { display: block; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.panel-header h2 {
  margin: 0;
  font-size: 1.2rem;
}
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  background: none;
  color: var(--accent);
  font-weight: 600;
  padding: 6px 4px;
}
.back-btn svg { width: 16px; height: 16px; }

.dropzone {
  display: block;
  border: 2px dashed color-mix(in srgb, var(--border) 70%, var(--text-muted) 30%);
  border-radius: var(--radius-md);
  padding: 30px 16px;
  text-align: center;
  color: var(--text-muted);
  font-weight: 500;
  background: var(--surface-alt);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.dropzone:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.dropzone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}
.dropzone strong { color: var(--text); }
.dropzone input { display: none; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.12s ease, transform 0.08s ease, border-color 0.12s ease;
}
.btn:hover { background: var(--surface-alt); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-primary:disabled { background: var(--accent); }
.btn-sm { padding: 6px 10px; font-size: 0.8rem; }
.btn svg { width: 16px; height: 16px; }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 16px 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
}
.field label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}
.field input[type="text"],
.field input[type="number"],
.field select {
  font: inherit;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
  max-height: 420px;
  overflow-y: auto;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-alt);
  flex-wrap: wrap;
}
.file-row .file-icon {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.file-row .file-icon svg { width: 16px; height: 16px; }
.file-meta {
  flex: 1;
  min-width: 120px;
}
.file-meta .name {
  font-weight: 600;
  font-size: 0.9rem;
  word-break: break-all;
}
.file-meta .sub {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.file-row .row-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

.rename-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
}
.new-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--success);
  word-break: break-all;
}
.new-name.conflict { color: var(--danger); }

table.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.86rem;
}
table.data-table th, table.data-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.hash-value {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  word-break: break-all;
}
.copy-btn {
  border: none;
  background: none;
  color: var(--text-muted);
  padding: 2px;
  flex-shrink: 0;
}
.copy-btn:hover { color: var(--accent); }
.copy-btn svg { width: 14px; height: 14px; }

.metadata-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  padding: 14px 16px;
  margin-top: 12px;
}
.metadata-card h4 {
  margin: 0 0 8px;
  font-size: 0.92rem;
  word-break: break-all;
}
.metadata-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px 16px;
}
.metadata-grid div span {
  display: block;
}
.metadata-grid .k {
  font-size: 0.74rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.metadata-grid .v {
  font-size: 0.88rem;
  font-weight: 600;
  word-break: break-word;
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
  padding: 18px 0;
}

.progress {
  height: 6px;
  border-radius: 999px;
  background: var(--surface-alt);
  overflow: hidden;
  margin-top: 12px;
  display: none;
}
.progress.active { display: block; }
.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.15s ease;
}

.status-msg {
  font-size: 0.84rem;
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  display: none;
}
.status-msg.active { display: block; }
.status-msg.info { background: var(--accent-soft); color: var(--accent); }
.status-msg.error { background: color-mix(in srgb, var(--danger) 15%, transparent); color: var(--danger); }
.status-msg.success { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

footer.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 24px 20px 40px;
}

@media (max-width: 540px) {
  .site-header { padding: 10px 14px; }
  .brand-name { display: none; }
  main { padding: 20px 14px 60px; }
  .panel { padding: 16px; }
  .file-row { flex-direction: column; align-items: stretch; }
  .row-actions { justify-content: flex-end; }
}