:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #16181d;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-soft: #eef0fe;
  --danger: #ef4444;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #1a1d24;
    --text: #f3f4f6;
    --text-muted: #9ca3af;
    --border: #2b2f38;
    --accent-soft: #262a4a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; }

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.upload-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}
.upload-btn:hover { background: var(--accent-hover); }
.upload-btn svg { width: 16px; height: 16px; }

.topbar-actions { display: flex; align-items: center; gap: 12px; }

.logout-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.logout-btn:hover { color: var(--text); border-color: var(--text-muted); }

.content {
  flex: 1;
  padding: 32px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  box-sizing: border-box;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 20px 16px;
}

.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(16, 24, 40, 0.12);
}

.card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 24px 14px 16px;
  text-decoration: none;
  color: inherit;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.card-name {
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-meta {
  font-size: 11px;
  color: var(--text-muted);
}

.card-delete {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--bg);
  background: var(--danger);
  color: white;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: transform 0.15s ease;
}
.card-delete:hover { transform: scale(1.15); }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 100px 20px;
  color: var(--text-muted);
  text-align: center;
}
.empty-state p { margin: 10px 0 0; font-weight: 600; color: var(--text); }
.empty-state span { font-size: 13px; }
.empty-state[hidden] { display: none; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--surface);
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: var(--shadow);
  max-width: calc(100vw - 40px);
}
.toast-error { background: var(--danger); color: white; }

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  box-sizing: border-box;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 40px 32px;
  width: 100%;
  max-width: 340px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-sizing: border-box;
}

.brand-center { justify-content: center; margin-bottom: 8px; }

.login-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.login-card input {
  font: inherit;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.login-card input:focus { outline: none; border-color: var(--accent); }

.login-submit { justify-content: center; border: none; margin-top: 8px; }

.login-error { color: var(--danger); font-size: 13px; text-align: center; margin: 0; }