/* ─────────────────────────────────────────────────────
   minidrop — minimalist cloud storage
   モノクロを基調としたシンプルなデザイン
   ───────────────────────────────────────────────────── */

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e5e5;
  --border-strong: #1a1a1a;
  --text: #1a1a1a;
  --text-muted: #707070;
  --text-faint: #a0a0a0;
  --accent: #1a1a1a;
  --danger: #c0392b;
  --success: #2d8659;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: 'JetBrains Mono', 'Menlo', 'Consolas', monospace;
  letter-spacing: 0.02em;
}

/* ─── Loading ─── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: var(--text-faint);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ─── Auth Screen ─── */
.auth-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 360px;
}

.brand {
  text-align: center;
  margin-bottom: 48px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.brand-dot {
  width: 8px;
  height: 8px;
  background: var(--text);
  border-radius: 50%;
}

.brand-tagline {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.tab {
  flex: 1;
  background: none;
  border: none;
  padding: 10px 0;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  font-family: inherit;
  border-bottom: 1px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--text);
  border-bottom-color: var(--text);
  font-weight: 500;
}

.form-group {
  margin-bottom: 16px;
}

.label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  border-radius: 0;
}

.input:focus {
  border-color: var(--text);
}

.input.mono {
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.05em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 11px 16px;
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--surface);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  letter-spacing: 0.02em;
}

.btn:hover:not(:disabled) {
  background: transparent;
  color: var(--text);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--text);
  color: var(--surface);
}

.btn-ghost {
  border: none;
  background: none;
  color: var(--text-muted);
  width: auto;
  padding: 4px 8px;
}

.btn-ghost:hover {
  color: var(--text);
  background: none;
}

.btn-icon {
  width: auto;
  padding: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
}

.btn-icon:hover {
  color: var(--text);
}

.btn-icon.danger:hover {
  color: var(--danger);
}

.message {
  padding: 10px 12px;
  font-size: 12px;
  margin-bottom: 16px;
  border-left: 2px solid var(--text);
  background: #f5f5f5;
}

.message.error {
  border-color: var(--danger);
  color: var(--danger);
}

.message.success {
  border-color: var(--success);
  color: var(--success);
}

.hint {
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 6px;
  line-height: 1.5;
}

/* ─── ID Display (after register) ─── */
.id-display {
  text-align: center;
  padding: 32px 16px;
}

.id-display-label {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.id-display-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 28px;
  font-weight: 500;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
  padding: 12px;
  border: 1px dashed var(--border);
  user-select: all;
}

.id-display-warning {
  font-size: 12px;
  color: var(--danger);
  margin-top: 16px;
  margin-bottom: 24px;
  line-height: 1.6;
}

/* ─── Main App Layout ─── */
.app-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-id {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.user-id strong {
  color: var(--text);
  font-weight: 500;
}

.storage-info {
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

.storage-bar {
  width: 120px;
  height: 2px;
  background: var(--border);
  margin-top: 4px;
  overflow: hidden;
}

.storage-bar-fill {
  height: 100%;
  background: var(--text);
  transition: width 0.3s;
}

/* ─── Main Content ─── */
.main {
  flex: 1;
  padding: 32px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

/* ─── Upload Area ─── */
.upload-area {
  border: 1px dashed var(--border);
  padding: 48px 24px;
  text-align: center;
  margin-bottom: 32px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--text);
  background: #f5f5f5;
}

.upload-area-icon {
  width: 32px;
  height: 32px;
  margin: 0 auto 12px;
  display: block;
  color: var(--text-faint);
}

.upload-area-text {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.upload-area-hint {
  font-size: 11px;
  color: var(--text-faint);
}

.upload-progress {
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-muted);
}

#file-input {
  display: none;
}

/* ─── File List ─── */
.files-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.files-title {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.files-count {
  font-size: 11px;
  color: var(--text-faint);
  font-family: 'JetBrains Mono', monospace;
}

.file-list {
  background: var(--surface);
  border: 1px solid var(--border);
}

.file-item {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

.file-item:last-child {
  border-bottom: none;
}

.file-item:hover {
  background: #fafafa;
}

.file-name {
  font-size: 13px;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon {
  width: 14px;
  height: 14px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.file-size {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-muted);
  min-width: 64px;
  text-align: right;
}

.file-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--text-faint);
  min-width: 100px;
  text-align: right;
}

.file-actions {
  display: flex;
  gap: 2px;
}

.empty {
  padding: 64px 16px;
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.empty-icon {
  width: 32px;
  height: 32px;
  margin: 0 auto 12px;
  display: block;
  opacity: 0.5;
}

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 18px;
  background: var(--text);
  color: var(--surface);
  font-size: 12px;
  letter-spacing: 0.03em;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  opacity: 1;
}

.toast.error {
  background: var(--danger);
}

/* ─── Footer ─── */
.footer {
  text-align: center;
  padding: 24px;
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .header { padding: 14px 16px; }
  .header-left { gap: 12px; }
  .main { padding: 16px; }
  .upload-area { padding: 32px 16px; }
  .file-item {
    grid-template-columns: 1fr auto;
    gap: 8px;
  }
  .file-date { display: none; }
  .storage-bar { width: 80px; }
  .user-id { font-size: 11px; }
}