:root {
  --fg: #1f2328;
  --fg-muted: #59636e;
  --bg: #f6f8fa;
  --card: #ffffff;
  --border: #d1d9e0;
  --accent: #0969da;
  --btn: #1f883d;
  --btn-hover: #1c8139;
  --danger: #d1242f;
  --danger-bg: #ffebe9;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f0f6fc;
    --fg-muted: #9198a1;
    --bg: #010409;
    --card: #0d1117;
    --border: #3d444d;
    --accent: #4493f8;
    --btn: #238636;
    --btn-hover: #29903b;
    --danger: #f85149;
    --danger-bg: rgba(248, 81, 73, 0.1);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
}

body {
  min-height: 100vh;
  padding: 32px 16px;
}

.card {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

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

h1 {
  flex: 1;
  margin: 0;
  font-size: 24px;
}

h2 {
  margin: 0 0 8px;
  font-size: 20px;
}

.lang {
  padding: 4px 10px;
  color: var(--fg-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.lang:hover {
  color: var(--fg);
}

.intro {
  margin: 8px 0 4px;
  color: var(--fg-muted);
}

.alt {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--fg-muted);
}

.alt a,
.privacy a {
  color: var(--accent);
}

form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 520px) {
  .row {
    grid-template-columns: 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
}

.req {
  color: var(--danger);
  font-style: normal;
}

input,
select,
textarea {
  width: 100%;
  padding: 7px 10px;
  color: var(--fg);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  font-weight: 400;
}

textarea {
  resize: vertical;
  min-height: 140px;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
  border-color: transparent;
}

.hint {
  display: flex;
  gap: 8px;
  font-weight: 400;
  font-size: 12px;
  color: var(--fg-muted);
}

.counter {
  margin-left: auto;
}

.counter.over,
.counter.under {
  color: var(--danger);
}

.hp {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.turnstile {
  min-height: 65px;
}

.msg-error {
  margin: 0;
  padding: 8px 12px;
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: 6px;
  font-size: 14px;
}

.btn {
  align-self: flex-start;
  padding: 8px 20px;
  color: #fff;
  background: var(--btn);
  border: 1px solid rgba(31, 35, 40, 0.15);
  border-radius: 6px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.btn-secondary {
  color: var(--fg);
  background: var(--bg);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

.privacy {
  margin: 0;
  font-size: 12px;
  color: var(--fg-muted);
}

.done p {
  color: var(--fg-muted);
}

[hidden] {
  display: none !important;
}

.dropzone {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px dashed var(--border);
  border-radius: 6px;
  font-weight: 400;
}

.dropzone.drag {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.dropzone .hint {
  display: block;
}

.btn-small {
  flex-shrink: 0;
  align-self: center;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 500;
}

.thumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.thumbs:empty {
  display: none;
}

.thumbs li {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 96px;
  font-size: 11px;
  font-weight: 400;
  color: var(--fg-muted);
}

.thumbs img {
  width: 96px;
  height: 72px;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
}

.thumb-remove {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 22px;
  height: 22px;
  padding: 0;
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
  border: 0;
  border-radius: 50%;
  font-size: 15px;
  line-height: 22px;
  cursor: pointer;
}

.thumb-remove:hover {
  background: var(--danger);
}

@media (max-width: 520px) {
  .dropzone {
    flex-direction: column;
    align-items: flex-start;
  }
}
/* 标题下的说明行：反馈对象 · 版本 · 浏览器（只展示） */
.context {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 0;
  margin: 12px 0 4px;
  font-size: 14px;
  color: var(--fg-muted);
}

.context strong {
  color: var(--fg);
  font-weight: 600;
}

.ctx-item::before {
  content: '·';
  margin: 0 8px;
}

.ctx-item[hidden] {
  display: none !important;
}