:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --surface: #ffffff;
  --panel: #f5f5f7;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --dash: #c7c7cc;
  --accent: #0071e3;
  --accent-2: #5ac8fa;
  --accent-hover: #0077ed;
  --accent-text: #ffffff;
  --accent-soft: rgba(0, 113, 227, 0.08);
  --accent-shadow: rgba(0, 113, 227, 0.35);
  --error: #d70015;
  --error-line: rgba(215, 0, 21, 0.35);
  --success: #248a3d;
  --focus: rgba(0, 113, 227, 0.45);
  --glow: rgba(0, 113, 227, 0.1);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 16px 48px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000;
    --surface: #1c1c1e;
    --panel: #2c2c2e;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --line: #38383a;
    --dash: #58585c;
    --accent: #2997ff;
    --accent-2: #64d2ff;
    --accent-hover: #409cff;
    --accent-text: #1d1d1f;
    --accent-soft: rgba(41, 151, 255, 0.14);
    --accent-shadow: rgba(41, 151, 255, 0.3);
    --error: #ff6961;
    --error-line: rgba(255, 105, 97, 0.4);
    --success: #30d158;
    --focus: rgba(41, 151, 255, 0.5);
    --glow: rgba(41, 151, 255, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 16px 48px rgba(0, 0, 0, 0.5);
  }
}

:root[data-theme="dark"] {
  --bg: #000000;
  --surface: #1c1c1e;
  --panel: #2c2c2e;
  --fg: #f5f5f7;
  --muted: #a1a1a6;
  --line: #38383a;
  --dash: #58585c;
  --accent: #2997ff;
  --accent-2: #64d2ff;
  --accent-hover: #409cff;
  --accent-text: #1d1d1f;
  --accent-soft: rgba(41, 151, 255, 0.14);
  --accent-shadow: rgba(41, 151, 255, 0.3);
  --error: #ff6961;
  --error-line: rgba(255, 105, 97, 0.4);
  --success: #30d158;
  --focus: rgba(41, 151, 255, 0.5);
  --glow: rgba(41, 151, 255, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 16px 48px rgba(0, 0, 0, 0.5);
}

body {
  margin: 0;
  padding: 40px 16px;
  background: radial-gradient(900px 500px at 50% -120px, var(--glow), transparent 70%), var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "PingFang TC", "Hiragino Sans", "Noto Sans JP", "Noto Sans KR", "Apple SD Gothic Neo", "Microsoft YaHei", "Malgun Gothic", sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  box-sizing: border-box;
  max-width: 680px;
  margin: 0 auto;
  padding: 36px 40px 40px;
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand img {
  display: block;
  width: 28px;
  height: 28px;
}

select {
  appearance: none;
  -webkit-appearance: none;
  padding: 7px 34px 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%238e8e93' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 12px center / 10px 6px;
  color: var(--fg);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

h1 {
  margin: 0;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.badge {
  padding: 5px 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: var(--accent-text);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  box-shadow: 0 6px 16px -6px var(--accent-shadow);
}

.intro {
  margin: 10px 0 0;
  color: var(--muted);
}

.drop {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  box-sizing: border-box;
  min-height: 200px;
  margin: 28px 0 20px;
  padding: 36px 20px;
  border: 1.5px dashed var(--dash);
  border-radius: 22px;
  background: var(--panel);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s, transform 0.2s;
}

.drop:hover,
.drop.over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop.over {
  transform: scale(1.01);
}

.drop:focus-within {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.drop svg {
  box-sizing: border-box;
  width: 72px;
  height: 72px;
  padding: 18px;
  border-radius: 50%;
  color: var(--accent);
  background: var(--surface);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.drop span {
  font-weight: 500;
}

/* visually hidden, but still focusable and clickable through its label */
.drop input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.option {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 15px;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}

.option:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.option input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--accent);
}

.summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: 18px;
  background: var(--panel);
}

.summary[hidden] {
  display: none;
}

.progress {
  flex: 1 1 240px;
  min-width: 0;
}

progress {
  display: block;
  width: 100%;
  height: 8px;
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}

progress::-webkit-progress-bar {
  background: var(--line);
  border-radius: 999px;
}

progress::-webkit-progress-value {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.3s ease;
}

progress::-moz-progress-bar {
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

#count {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.actions {
  display: flex;
  gap: 10px;
}

button {
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

button:hover:not(:disabled) {
  border-color: var(--dash);
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  box-shadow: 0 8px 20px -8px var(--accent-shadow);
}

button.primary:hover:not(:disabled) {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}

button:disabled {
  opacity: 0.45;
  box-shadow: none;
  cursor: default;
}

select:focus-visible,
button:focus-visible,
a:focus-visible,
.option input:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

ul {
  display: grid;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 16px;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  animation: rise 0.3s ease-out both;
}

li.error {
  border-color: var(--error-line);
}

.name {
  overflow-wrap: anywhere;
  font-weight: 600;
}

.status {
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

li:has(a) .status {
  color: var(--success);
}

.error .status {
  color: var(--error);
}

li a {
  grid-column: 2;
  grid-row: 1 / span 2;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}

li a:hover {
  background: var(--accent);
  color: var(--accent-text);
}

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

footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

@media (max-width: 480px) {
  body {
    padding: 16px;
  }

  main {
    padding: 24px 20px 28px;
    border-radius: 22px;
  }

  h1 {
    font-size: 26px;
  }

  .drop {
    min-height: 170px;
    padding: 28px 16px;
  }

  .actions {
    flex-direction: column;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .drop,
  .option,
  button,
  li a,
  progress::-webkit-progress-value {
    transition: none;
  }

  li {
    animation: none;
  }
}