/* ============================================================
   SEO 关键词优化工作台 —— 样式
   沿用工具箱 design tokens（indigo #6366f1），纯 CSS + 媒体查询深色模式
   ============================================================ */
:root {
  --bg-a: #eef2ff;
  --bg-b: #f8fafc;
  --bg-c: #ecfeff;
  --text: #0f172a;
  --text-muted: #64748b;
  --card-bg: #ffffff;
  --card-border: rgba(15, 23, 42, 0.08);
  --card-shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 12px 32px -12px rgba(15, 23, 42, .18);
  --accent: #6366f1;
  --accent-soft: rgba(99, 102, 241, .12);
  --accent-contrast: #ffffff;
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --ring: rgba(99, 102, 241, .35);
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 16px;
  --radius-sm: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-a: #0b1020;
    --bg-b: #0d1426;
    --bg-c: #0a1a24;
    --text: #e6ebf5;
    --text-muted: #94a3b8;
    --card-bg: rgba(255, 255, 255, .055);
    --card-border: rgba(255, 255, 255, .10);
    --card-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -16px rgba(0, 0, 0, .6);
    --accent: #818cf8;
    --accent-soft: rgba(129, 140, 248, .16);
    --accent-contrast: #0b1020;
    --input-bg: #131a2c;
    --input-border: rgba(255, 255, 255, .14);
    --ring: rgba(129, 140, 248, .45);
    --ok: #4ade80;
    --warn: #fbbf24;
    --danger: #f87171;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg-b);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(60rem 40rem at 12% -10%, var(--bg-a), transparent 60%),
    radial-gradient(50rem 36rem at 92% 8%, var(--bg-c), transparent 62%),
    linear-gradient(180deg, var(--bg-b), var(--bg-b));
}
.wrap { max-width: 1080px; margin: 0 auto; padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2rem) 4rem; }

h1.page-title { margin: 1.5rem 0 .35rem; font-size: clamp(1.6rem, 4.5vw, 2.3rem); letter-spacing: -.02em; }
.subtitle { color: var(--text-muted); margin: 0 0 1.5rem; font-size: .95rem; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 1.25rem 1.25rem 1.4rem;
  margin-bottom: 1.25rem;
  backdrop-filter: blur(12px);
}
.card > h2 { margin: 0 0 1rem; font-size: 1.05rem; display: flex; align-items: center; gap: .5rem; }
.card > h2 .step { font-size: .72rem; font-weight: 700; color: var(--accent); background: var(--accent-soft); padding: .15rem .5rem; border-radius: 999px; }

.row { margin-bottom: 1rem; }
.row:last-child { margin-bottom: 0; }
label.field { display: block; margin-bottom: .45rem; font-weight: 600; font-size: .9rem; color: var(--text); }
.tip { font-size: .82rem; color: var(--text-muted); margin-top: .35rem; }

input[type=text], input[type=number], select, textarea {
  width: 100%; padding: .65rem .8rem; font: inherit; font-size: .92rem;
  color: var(--text); background: var(--input-bg);
  border: 1px solid var(--input-border); border-radius: var(--radius-sm); outline: none;
  transition: border-color .18s, box-shadow .18s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring); }
textarea { resize: vertical; line-height: 1.6; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem; }
@media (max-width: 720px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

/* 按钮 */
.btn { padding: .6rem 1.1rem; border: 1px solid transparent; border-radius: var(--radius-sm); font: inherit; font-size: .9rem; font-weight: 600; cursor: pointer; transition: transform .12s, filter .15s, background .15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { filter: brightness(1.07); }
.btn-ghost { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.btn-ghost:hover { filter: brightness(.98); }
.btn-ok { background: var(--ok); color: #fff; }
.btn-row { display: flex; gap: .7rem; flex-wrap: wrap; margin-top: .8rem; }
.btn-sm { padding: .35rem .7rem; font-size: .82rem; }

/* 上传拖拽 */
.dropzone {
  border: 2px dashed var(--input-border); border-radius: var(--radius); padding: 2rem 1rem; text-align: center;
  color: var(--text-muted); cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.dropzone strong { color: var(--text); }

/* API Key 区 */
.kv-row { display: grid; grid-template-columns: 1fr; gap: .7rem; }
.key-toggle { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-bottom: .8rem; }
.model-check { display: flex; flex-direction: column; align-items: stretch; gap: .45rem; padding: .6rem .75rem; border: 1px solid var(--input-border); border-radius: var(--radius-sm); background: var(--input-bg); }
.model-check .mc-top { display: flex; align-items: center; gap: .5rem; cursor: pointer; }
.model-check input { width: auto; margin: 0; }
.model-check .mc-name { font-weight: 600; font-size: .9rem; }
.badge-free { display: inline-block; font-size: .68rem; font-weight: 700; line-height: 1; padding: .18rem .4rem; border-radius: 999px; color: #0a7f3c; background: color-mix(in srgb, #16a34a 16%, transparent); border: 1px solid color-mix(in srgb, #16a34a 35%, transparent); transform: translateY(-1px); }
:root.dark .badge-free { color: #4ade80; background: color-mix(in srgb, #22c55e 18%, transparent); border-color: color-mix(in srgb, #22c55e 40%, transparent); }
.model-check .vc, .model-check .mi { display: flex; align-items: center; gap: .4rem; font-size: .8rem; color: var(--text-muted); white-space: nowrap; }
.model-check .vc input { width: 56px; padding: .25rem .4rem; }
.model-check .mi input { flex: 1; min-width: 0; padding: .28rem .5rem; font-size: .8rem; }

/* 模型选择区：默认收起，点击展开（节省首屏空间） */
.model-collapse { border: 1px solid var(--input-border); border-radius: var(--radius-sm); background: var(--input-bg); margin: 0 0 .25rem; }
.model-collapse-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .7rem .85rem; font-weight: 600; color: var(--text); cursor: pointer; list-style: none; user-select: none; }
.model-collapse-head::-webkit-details-marker { display: none; }
.model-collapse-head .chev { flex: none; font-size: 12px; color: var(--text-muted); transition: transform .2s ease; }
.model-collapse[open] .chev { transform: rotate(90deg); }
.model-collapse-body { padding: 0 .85rem .85rem; }
.model-collapse-body .tip { margin-top: .5rem; }

/* 手动 Key 下拉 + 动态字段 */
.key-entry { max-width: 440px; }
.key-entry select { max-width: 440px; }
.manual-fields { display: grid; grid-template-columns: 1fr; gap: .7rem; }
.manual-fields .kf { display: block; }
.manual-fields .kf .field { margin-bottom: .3rem; }

/* Tabs */
.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1rem; border-bottom: 1px solid var(--card-border); padding-bottom: .6rem; }
.tab {
  display: inline-flex; align-items: center; gap: .4rem; padding: .5rem .9rem; border-radius: 999px;
  border: 1px solid transparent; background: transparent; color: var(--text-muted); cursor: pointer; font: inherit; font-weight: 600; font-size: .9rem;
  transition: background .15s, color .15s;
}
.tab:hover { background: var(--accent-soft); color: var(--text); }
.tab.active { background: var(--accent); color: var(--accent-contrast); }
.tab .badge { display: inline-flex; align-items: center; font-size: .72rem; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: .05rem .5rem; min-width: 1.3rem; text-align: center; }
.tab.active .badge { background: rgba(255,255,255,.25); color: #fff; }
.tab .badge-opt { font-weight: 500; opacity: .72; margin-left: .25rem; font-size: .68rem; }

/* 本页元素计数行 */
.page-count { font-size: .85rem; color: var(--text-muted); margin: 0 0 .9rem; }
.page-count b { color: var(--text); }

/* Prompt 预览卡片 */
.prompt-box { position: relative; }
.prompt-box textarea { min-height: 150px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .82rem; }

/* 按元素类型拆分的 Prompt */
.type-prompt-card .field-sm { font-size: .82rem; margin: .9rem 0 .35rem; color: var(--text-muted); }
.type-prompt-row textarea { width: 100%; min-height: 110px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .8rem; background: var(--input-bg); border: 1px solid var(--input-border); border-radius: var(--radius-sm); padding: .6rem .7rem; color: var(--text); resize: vertical; }
.type-prompt-row .btn-row { margin-top: .35rem; }

/* 元素块 */
.el {
  border: 1px solid var(--card-border); border-radius: var(--radius-sm); padding: 1rem; margin-bottom: .9rem; background: var(--input-bg);
}
.el-head { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; margin-bottom: .5rem; }
.el-label { font-weight: 700; font-size: .95rem; }
.el-outlet { font-size: .78rem; font-weight: 700; padding: .12rem .55rem; border-radius: 999px; background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.el-type { font-size: .72rem; font-weight: 700; padding: .1rem .5rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.el-type.title { background: #fef3c7; color: #b45309; }
.el-type.h2 { background: #dbeafe; color: #1d4ed8; }
.el-type.description { background: #dcfce7; color: #15803d; }
.el-type.highlight { background: #fae8ff; color: #a21caf; }
.el-type.name { background: #e2e8f0; color: #475569; }
.el-opt { margin-left: auto; display: flex; align-items: center; gap: .35rem; font-size: .82rem; color: var(--text-muted); }
.el-opt input { width: auto; margin: 0; }

.el-orig { font-size: .85rem; color: var(--text-muted); background: color-mix(in srgb, var(--text) 4%, transparent); border-radius: 8px; padding: .5rem .65rem; margin-bottom: .5rem; white-space: pre-wrap; word-break: break-word; }
.el-kw { font-size: .8rem; color: var(--accent); margin-bottom: .6rem; }
.el-kw b { color: var(--text); font-weight: 600; }

/* AI 建议区 */
.suggestions { margin: .6rem 0; border-top: 1px dashed var(--card-border); padding-top: .6rem; }
.suggestions:empty { display: none; }
.sug-group { margin-bottom: .7rem; }
.sug-group > .sg-title { font-size: .82rem; font-weight: 700; color: var(--text-muted); margin-bottom: .35rem; }
.sug-group > .sg-title .sg-count { font-weight: 500; color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); border-radius: 999px; padding: .05rem .4rem; font-size: .74rem; margin-left: .3rem; }
/* 上次生成结果状态卡（逐模型成功/失败） */
.status-card { margin-bottom: 1rem; }
.status-card .field { margin-bottom: .5rem; }
.gs-row { font-size: .86rem; line-height: 1.7; padding: .15rem 0; }
.gs-row.gs-ok { color: var(--text); }
.gs-row.gs-fail { color: var(--danger, #c0392b); }
.gs-warn { color: #b7791f; font-weight: 600; }
.gs-mid { font-size: .76rem; font-weight: 500; color: var(--text-muted); background: var(--input-bg); border: 1px solid var(--input-border); border-radius: 4px; padding: .05rem .3rem; }
/* 植入的关键词：加粗 + 淡色底，便于审核一眼看出 */
.sug-item .sug-text strong, .alloc-text strong { font-weight: 800; color: var(--accent); background: color-mix(in srgb, var(--accent) 13%, transparent); border-radius: 3px; padding: 0 .18rem; }
.status-card .tip { margin: .5rem 0 0; }
.sug-item { display: flex; gap: .5rem; align-items: flex-start; padding: .5rem .6rem; border: 1px solid var(--card-border); border-radius: 8px; margin-bottom: .4rem; background: color-mix(in srgb, var(--accent) 4%, transparent); }
.sug-item .sug-text { flex: 1; font-size: .86rem; white-space: pre-wrap; word-break: break-word; }
.alloc-card { margin-top: 1rem; }
.alloc-card .field { margin-bottom: .4rem; }
.alloc-text { white-space: pre-wrap; word-break: break-word; line-height: 1.65; color: var(--text); background: var(--input-bg); border: 1px solid var(--input-border); border-radius: var(--radius-sm); padding: .6rem .8rem; margin-top: .4rem; font-size: .88rem; }
.sug-item .sug-fill { flex: 0 0 auto; }
.sug-item.sug-warn { background: color-mix(in srgb, var(--danger) 8%, transparent); border-color: color-mix(in srgb, var(--danger) 50%, transparent); }
.sug-warn-tag { display: inline-block; margin-left: .3rem; font-size: .72rem; font-weight: 700; color: var(--danger); background: color-mix(in srgb, var(--danger) 12%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent); border-radius: 4px; padding: .05rem .35rem; vertical-align: middle; cursor: help; }

/* 编辑框 + 计数 */
.el-edit { position: relative; }
.counter { position: absolute; right: .6rem; top: .5rem; font-size: .78rem; font-variant-numeric: tabular-nums; color: var(--text-muted); pointer-events: none; background: var(--input-bg); padding: 0 .25rem; border-radius: 4px; }
.counter.over { color: var(--danger); font-weight: 700; }
.el textarea.final { min-height: 70px; padding-right: 4rem; }
.el textarea.final[data-type="description"] { min-height: 130px; }
.el textarea.final[data-type="highlight"] { min-height: 100px; }
.el textarea.final.over { border-color: var(--danger); box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 25%, transparent); }
.warn-line { font-size: .82rem; color: var(--warn); margin-top: .4rem; font-weight: 600; }
.warn-line.danger { color: var(--danger); }

/* 隐藏区 */
[hidden] { display: none !important; }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%) translateY(20px); background: var(--text); color: var(--bg-b); padding: .7rem 1.2rem; border-radius: 10px; font-size: .88rem; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 80; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 恢复横幅 */
.restore-banner { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); color: var(--text); border-radius: var(--radius-sm); padding: .7rem .9rem; margin-bottom: 1rem; font-size: .88rem; }
.restore-banner .spacer { flex: 1; }

/* 解析摘要 */
.summary { display: flex; gap: 1.2rem; flex-wrap: wrap; font-size: .88rem; color: var(--text-muted); margin-top: .6rem; }
.summary b { color: var(--text); }

.muted { color: var(--text-muted); font-size: .85rem; }
.code-inline { font-family: ui-monospace, Menlo, Consolas, monospace; background: color-mix(in srgb, var(--text) 6%, transparent); padding: .05rem .35rem; border-radius: 5px; font-size: .85em; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* 回到顶部浮动按钮（右侧固定，滚动超过阈值后淡入） */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-size: .85rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--card-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s, filter .15s ease;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover { filter: brightness(1.08); }
.back-to-top:active { transform: translateY(0) scale(.97); }
@media (max-width: 640px) {
  .back-to-top { right: 12px; bottom: 16px; padding: 9px 13px; }
}