/* ============================================================
   AINav 全局样式 · 响应式（PC / 平板 / 手机）
   ============================================================ */

:root {
  --primary: #4f46e5;
  --primary-2: #7c3aed;
  --primary-light: #eef2ff;
  --accent: #06b6d4;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --text-1: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 4px 16px rgba(15, 23, 42, .06);
  --shadow-lg: 0 8px 30px rgba(79, 70, 229, .12);
  --maxw: 1200px;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.65;
  font-size: 15px;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ================= 导航 ================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  height: 64px; display: flex; align-items: center; gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; flex-shrink: 0; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 17px; box-shadow: var(--shadow-lg);
}
.logo em { font-style: normal; background: linear-gradient(90deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.logo small { font-size: 11px; font-weight: 500; color: var(--text-3); margin-left: 2px; }

.nav-links { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav-links a {
  padding: 8px 14px; border-radius: 8px; font-size: 15px; color: var(--text-2);
  transition: .2s; white-space: nowrap;
}
.nav-links a:hover { color: var(--primary); background: var(--primary-light); }
.nav-links a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
/* 修正：防止 .nav-links a 覆盖按钮样式 */
.nav-links a.btn-primary { color: #fff; padding: 9px 18px; background: linear-gradient(135deg, var(--primary), var(--primary-2)); border: none; }
.nav-links a.btn-primary:hover { color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-2)); transform: translateY(-1px); }

.nav-search {
  position: relative; width: 240px; flex-shrink: 0;
  margin-left: auto;
}
.nav-search input {
  width: 100%; height: 38px; border: 1px solid var(--border); border-radius: 999px;
  padding: 0 38px 0 36px; font-size: 14px; background: var(--bg); outline: none;
  transition: .2s;
}
.nav-search input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.nav-search .icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--text-3); font-size: 14px; pointer-events: none; }

/* 搜索联想下拉 */
.nav-search .suggest {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-lg); overflow: hidden; display: none; z-index: 120;
}
.nav-search .suggest.open { display: block; }
.suggest-item { display: flex; gap: 10px; align-items: center; padding: 9px 14px; cursor: pointer; transition: .15s; }
.suggest-item:hover { background: var(--primary-light); }
.suggest-item .tool-logo { width: 32px; height: 32px; border-radius: 8px; font-size: 16px; }
.suggest-item .n { font-size: 14px; font-weight: 600; line-height: 1.4; }
.suggest-item .d { font-size: 12px; color: var(--text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 170px; }
.suggest-all { display: block; padding: 10px 14px; text-align: center; font-size: 13px; color: var(--primary); border-top: 1px dashed var(--border); font-weight: 600; }
.suggest-all:hover { background: var(--primary-light); }
.suggest-empty { padding: 14px; text-align: center; font-size: 13px; color: var(--text-3); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px; border-radius: 10px; font-size: 14px; font-weight: 600;
  transition: .2s; white-space: nowrap; border: 1px solid transparent;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: 0 4px 14px rgba(79,70,229,.3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(79,70,229,.4); }
.btn-ghost { border-color: var(--border); color: var(--text-2); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-danger { background: #fef2f2; color: var(--danger); border-color: #fecaca; }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }

.menu-toggle { display: none; font-size: 22px; color: var(--text-2); padding: 6px 10px; border-radius: 8px; }
.menu-toggle:hover { background: var(--primary-light); }

/* 移动端菜单 */
@media (max-width: 900px) {
  .nav-inner { height: 56px; gap: 12px; }
  .menu-toggle { display: block; margin-left: auto; }
  .nav-links {
    display: none; position: absolute; top: 56px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 32px rgba(15,23,42,.1); padding: 8px 16px 16px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 13px 10px; border-radius: 10px; font-size: 16px; }
  .nav-links a.btn-primary { padding: 12px; text-align: center; justify-content: center; }
  /* 移动端：搜索框收进菜单内，保持可用 */
  .nav-search { display: block; width: 100%; margin: 10px 0 6px; }
  .nav-search .suggest { left: 0; right: 0; }
  .suggest-item .d { max-width: none; }
  .nav-cta { margin-top: 10px; width: 100%; }
}

/* ================= Hero / Banner ================= */
.hero {
  background:
    radial-gradient(600px 300px at 12% 0%, rgba(124,58,237,.14), transparent 60%),
    radial-gradient(500px 300px at 88% 10%, rgba(6,182,212,.12), transparent 60%),
    linear-gradient(180deg, #f5f6ff 0%, var(--bg) 100%);
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
}
.hero h1 { font-size: clamp(26px, 4vw, 40px); font-weight: 800; line-height: 1.3; letter-spacing: -.5px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--primary), var(--primary-2), var(--accent)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero .sub { margin-top: 14px; font-size: 16px; color: var(--text-2); max-width: 640px; }

.hero-search { margin-top: 26px; max-width: 620px; position: relative; }
.hero-search input {
  width: 100%; height: 54px; border: 1px solid var(--border); border-radius: 999px;
  padding: 0 130px 0 52px; font-size: 16px; background: #fff; outline: none;
  box-shadow: var(--shadow); transition: .2s;
}
.hero-search input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(79,70,229,.12), var(--shadow); }
.hero-search .icon { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); color: var(--text-3); font-size: 18px; }
.hero-search .go {
  position: absolute; right: 6px; top: 6px; bottom: 6px;
  padding: 0 26px; border-radius: 999px; font-weight: 600; color: #fff; font-size: 15px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.hero-tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--text-3); font-size: 13px; }
.hero-tags a { padding: 4px 12px; border-radius: 999px; background: #fff; border: 1px solid var(--border); color: var(--text-2); transition: .2s; }
.hero-tags a:hover { border-color: var(--primary); color: var(--primary); }

/* ================= 通用区块 ================= */
.section { padding: 44px 0 8px; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }
.section-head h2 { font-size: 22px; font-weight: 800; display: flex; align-items: center; gap: 10px; }
.section-head h2::before { content: ""; width: 5px; height: 22px; border-radius: 3px; background: linear-gradient(180deg, var(--primary), var(--primary-2)); }
.section-head .more { color: var(--text-2); font-size: 14px; display: inline-flex; align-items: center; gap: 4px; }
.section-head .more:hover { color: var(--primary); }

/* ================= 分类入口网格 ================= */
.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.cat-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 16px; transition: .25s; display: flex; gap: 14px; align-items: flex-start;
}
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #c7d2fe; }
.cat-card .ico { font-size: 28px; line-height: 1; }
.cat-card h3 { font-size: 16px; font-weight: 700; }
.cat-card p { font-size: 13px; color: var(--text-2); margin-top: 4px; }
.cat-card .count { display: inline-block; margin-top: 8px; font-size: 12px; color: var(--primary); background: var(--primary-light); padding: 2px 10px; border-radius: 999px; }

/* ================= 工具卡片 ================= */
.tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tool-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; display: flex; flex-direction: column; gap: 10px; transition: .25s; position: relative;
}
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #c7d2fe; }
.tool-card .top { display: flex; gap: 12px; align-items: flex-start; }
.tool-logo {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  display: grid; place-items: center; font-size: 24px; color: #fff; font-weight: 700;
}
.tool-card .meta { flex: 1; min-width: 0; }
.tool-card h3 { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tool-card h3 .rate { font-size: 12px; color: var(--warning); font-weight: 700; }
.tool-card .tagline { font-size: 13px; color: var(--text-2); margin-top: 3px; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.tool-card .badges { display: flex; flex-wrap: wrap; gap: 6px; }
.tool-card .foot { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 8px; border-top: 1px dashed var(--border); font-size: 12px; color: var(--text-3); }

/* 徽标 */
.badge { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 999px; }
.badge-price-free { background: #ecfdf5; color: #059669; }
.badge-price-freemium { background: #eff6ff; color: #2563eb; }
.badge-price-paid { background: #fef3c7; color: #b45309; }
.badge-access-ok { background: #ecfdf5; color: #059669; }
.badge-access-mid { background: #fffbeb; color: #b45309; }
.badge-access-bad { background: #fef2f2; color: #dc2626; }
.badge-cn { background: var(--primary-light); color: var(--primary); }
.badge-tag { background: var(--bg); color: var(--text-2); border: 1px solid var(--border); font-weight: 500; }

/* ================= 首页 tabs ================= */
.tabs { display: inline-flex; background: var(--bg); border: 1px solid var(--border); border-radius: 999px; padding: 4px; gap: 2px; }
.tabs button { padding: 7px 18px; border-radius: 999px; font-size: 14px; color: var(--text-2); font-weight: 500; transition: .2s; }
.tabs button.active { background: #fff; color: var(--primary); font-weight: 700; box-shadow: var(--shadow); }

/* ================= 专题卡片 ================= */
.topic-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.topic-card {
  border-radius: var(--radius); overflow: hidden; background: var(--bg-card);
  border: 1px solid var(--border); transition: .25s; display: flex; flex-direction: column;
}
.topic-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.topic-cover { height: 110px; display: flex; align-items: flex-end; padding: 14px 16px; color: #fff; font-weight: 800; font-size: 18px; text-shadow: 0 1px 6px rgba(0,0,0,.25); position: relative; }
.topic-cover .n { position: absolute; top: 12px; right: 14px; font-size: 12px; font-weight: 600; background: rgba(255,255,255,.22); padding: 3px 10px; border-radius: 999px; backdrop-filter: blur(4px); }
.topic-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.topic-body p { font-size: 13px; color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.topic-body .avatars { display: flex; margin-top: auto; }
.topic-body .avatars span { width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; font-size: 14px; color: #fff; border: 2px solid #fff; margin-left: -6px; }
.topic-body .avatars span:first-child { margin-left: 0; }

/* ================= 资讯 ================= */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.news-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; transition: .25s; display: flex; flex-direction: column; gap: 10px; }
.news-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.news-card .tag { align-self: flex-start; font-size: 12px; color: var(--primary); background: var(--primary-light); padding: 2px 10px; border-radius: 999px; font-weight: 600; }
.news-card h3 { font-size: 16px; font-weight: 700; line-height: 1.5; }
.news-card p { font-size: 13px; color: var(--text-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card time { margin-top: auto; font-size: 12px; color: var(--text-3); }

/* ================= 工具库页布局 ================= */
.page-head { background: linear-gradient(180deg, #f5f6ff, var(--bg)); border-bottom: 1px solid var(--border); padding: 34px 0 26px; }
.page-head h1 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; }
.page-head p { margin-top: 8px; color: var(--text-2); }

.tools-layout { display: grid; grid-template-columns: 250px 1fr; gap: 24px; padding: 28px 0 60px; align-items: start; }
.filters {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; position: sticky; top: 80px;
}
.filters .f-group { padding: 14px 0; border-bottom: 1px dashed var(--border); }
.filters .f-group:first-child { padding-top: 0; }
.filters .f-group:last-child { border-bottom: none; padding-bottom: 0; }
.filters h4 { font-size: 14px; font-weight: 700; margin-bottom: 10px; }
.filters .opt { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px; border-radius: 8px; font-size: 14px; color: var(--text-2); cursor: pointer; transition: .15s; }
.filters .opt:hover { background: var(--primary-light); color: var(--primary); }
.filters .opt.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.filters .opt .n { font-size: 12px; color: var(--text-3); }

.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.toolbar .result { font-size: 14px; color: var(--text-2); }
.toolbar .result strong { color: var(--primary); }
.sort-bar { display: flex; gap: 6px; flex-wrap: wrap; }
.sort-bar button { padding: 6px 14px; border-radius: 8px; font-size: 13px; color: var(--text-2); border: 1px solid var(--border); background: #fff; transition: .2s; }
.sort-bar button.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.sort-bar button:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

.active-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.active-tags .chip { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; background: var(--primary-light); color: var(--primary); padding: 4px 12px; border-radius: 999px; cursor: pointer; }

/* 分页 */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 30px; flex-wrap: wrap; }
.pagination button { min-width: 38px; height: 38px; padding: 0 10px; border-radius: 10px; border: 1px solid var(--border); background: #fff; color: var(--text-2); font-size: 14px; transition: .2s; }
.pagination button:hover:not(:disabled):not(.active) { border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 700; }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

.empty { text-align: center; padding: 70px 20px; color: var(--text-3); }
.empty .ico { font-size: 44px; margin-bottom: 12px; }
.empty p { font-size: 15px; }

/* ================= 详情页 ================= */
.detail-wrap { padding: 30px 0 60px; }
.crumbs { font-size: 13px; color: var(--text-3); margin-bottom: 18px; }
.crumbs a { color: var(--text-2); }
.crumbs a:hover { color: var(--primary); }
.detail-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.detail-head { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; }
.detail-head .tool-logo { width: 76px; height: 76px; border-radius: 18px; font-size: 38px; }
.detail-head .info { flex: 1; min-width: 240px; }
.detail-head h1 { font-size: 26px; font-weight: 800; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.detail-head .tagline { margin-top: 6px; color: var(--text-2); }
.detail-head .badges { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 8px; }
.detail-actions { display: flex; flex-direction: column; gap: 10px; }
.detail-actions .btn { padding: 11px 28px; }
.detail-stats { display: flex; gap: 22px; margin: 22px 0; padding: 16px 20px; background: var(--bg); border-radius: var(--radius-sm); flex-wrap: wrap; }
.detail-stats .st { text-align: center; min-width: 70px; }
.detail-stats .st b { display: block; font-size: 19px; font-weight: 800; color: var(--text-1); }
.detail-stats .st span { font-size: 12px; color: var(--text-3); }
.detail-sec { margin-top: 26px; }
.detail-sec h2 { font-size: 18px; font-weight: 800; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.detail-sec .box { background: var(--bg); border-radius: var(--radius-sm); padding: 16px 18px; color: var(--text-2); font-size: 14.5px; line-height: 1.8; }
.detail-sec .box.comment { border-left: 4px solid var(--primary); background: var(--primary-light); color: var(--text-1); }
.detail-sec ul.tips { background: #fffbeb; border: 1px solid #fde68a; border-radius: var(--radius-sm); padding: 14px 18px 14px 34px; position: relative; color: #713f12; font-size: 14.5px; }
.detail-sec ul.tips li { list-style: disc; margin: 4px 0; }
.feedback-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }

/* ================= 资讯详情 / 关于 ================= */
.article { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(22px, 4vw, 44px); box-shadow: var(--shadow); max-width: 860px; margin: 30px auto 60px; }
.article .n-meta { display: flex; gap: 14px; align-items: center; color: var(--text-3); font-size: 13px; margin: 12px 0 24px; }
.article h1 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; line-height: 1.4; }
.article .n-tag { display: inline-block; background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 600; padding: 3px 12px; border-radius: 999px; }
.article p { margin: 14px 0; color: var(--text-2); font-size: 15.5px; line-height: 1.9; }
.article h2 { font-size: 19px; margin: 26px 0 10px; font-weight: 700; }
.article ul { padding-left: 22px; color: var(--text-2); }
.article ul li { list-style: disc; margin: 6px 0; }
.related-tools { margin-top: 30px; padding-top: 22px; border-top: 1px dashed var(--border); }
.related-tools h2 { font-size: 17px; font-weight: 800; margin-bottom: 14px; }

/* ================= 提示词库 ================= */
.prompt-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; padding-bottom: 60px; }
.prompt-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 12px; transition: .25s; }
.prompt-card:hover { box-shadow: var(--shadow-lg); border-color: #c7d2fe; }
.prompt-card h3 { font-size: 16px; font-weight: 700; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.prompt-card .scene { font-size: 13px; color: var(--text-2); }
.prompt-card pre {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; font-size: 13px; line-height: 1.7; white-space: pre-wrap; word-break: break-word;
  color: var(--text-2); font-family: inherit; flex: 1;
}
.prompt-card .foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.prompt-card .ptools { display: flex; gap: 6px; flex-wrap: wrap; }

/* ================= 表单页 ================= */
.form-wrap { max-width: 680px; margin: 30px auto 60px; }
.form-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(22px, 4vw, 36px); box-shadow: var(--shadow); }
.form-card h1 { font-size: 24px; font-weight: 800; margin-bottom: 6px; }
.form-card .lead { color: var(--text-2); font-size: 14px; margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.field label .req { color: var(--danger); margin-left: 2px; }
.field input, .field select, .field textarea {
  width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 11px 14px; font-size: 14.5px; background: #fff; outline: none; transition: .2s;
}
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.field .hint { font-size: 12.5px; color: var(--text-3); margin-top: 5px; }
.field .err { font-size: 12.5px; color: var(--danger); margin-top: 5px; display: none; }
.field.invalid input, .field.invalid select, .field.invalid textarea { border-color: var(--danger); }
.field.invalid .err { display: block; }
.form-success {
  display: none; text-align: center; padding: 40px 20px;
}
.form-success .ico { font-size: 52px; }
.form-success h2 { margin: 14px 0 8px; }
.form-success p { color: var(--text-2); font-size: 14.5px; }

/* ================= 中转页 ================= */
.redirect-body { min-height: 100vh; display: grid; place-items: center; background: linear-gradient(180deg, #f5f6ff, var(--bg)); }
.redirect-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow-lg); padding: 44px 40px; text-align: center; max-width: 460px; width: calc(100% - 40px); }
.redirect-card .ring { width: 84px; height: 84px; margin: 0 auto 20px; border-radius: 50%; display: grid; place-items: center; font-size: 26px; font-weight: 800; color: var(--primary); border: 4px solid var(--primary-light); position: relative; }
.redirect-card .ring::after { content: ""; position: absolute; inset: -4px; border-radius: 50%; border: 4px solid transparent; border-top-color: var(--primary); animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.redirect-card h1 { font-size: 19px; margin-bottom: 10px; }
.redirect-card .url-box { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; font-size: 13px; color: var(--text-2); word-break: break-all; margin: 14px 0; }
.redirect-card .notice { font-size: 12.5px; color: var(--text-3); text-align: left; background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px; padding: 10px 14px; margin: 14px 0; }
.redirect-card .actions { display: flex; gap: 10px; justify-content: center; margin-top: 8px; }

/* ================= 页脚 ================= */
.site-footer { background: #0f172a; color: #94a3b8; margin-top: 40px; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 48px 20px 0; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-inner .brand p { font-size: 13px; margin-top: 12px; line-height: 1.8; color: #64748b; }
.footer-inner h4 { color: #e2e8f0; font-size: 15px; margin-bottom: 14px; }
.footer-inner li { margin: 8px 0; }
.footer-inner li a { font-size: 13.5px; color: #94a3b8; transition: .2s; }
.footer-inner li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; margin-top: 36px; padding: 18px 20px; text-align: center; font-size: 12.5px; color: #64748b; max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.footer-bottom a { color: #94a3b8; }
.footer-bottom a:hover { color: #fff; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: rgba(15,23,42,.92); color: #fff; padding: 10px 22px; border-radius: 999px;
  font-size: 14px; opacity: 0; pointer-events: none; transition: .3s; z-index: 999;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* back to top */
.back-top {
  position: fixed; right: 22px; bottom: 28px; width: 44px; height: 44px; border-radius: 50%;
  background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow);
  display: grid; place-items: center; font-size: 18px; color: var(--primary);
  opacity: 0; pointer-events: none; transition: .3s; z-index: 90;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--primary); color: #fff; }

/* ================= 响应式 ================= */
@media (max-width: 1024px) {
  .cat-grid { grid-template-columns: repeat(3, 1fr); }
  .tool-grid, .topic-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-layout { grid-template-columns: 220px 1fr; }
}

@media (max-width: 768px) {
  .hero { padding: 36px 0 30px; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); }
  .tools-layout { grid-template-columns: 1fr; }
  .filters { position: static; }
  .prompt-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: repeat(2, 1fr); }
  .detail-card { padding: 20px; }
  .detail-actions { width: 100%; flex-direction: row; }
  .detail-actions .btn { flex: 1; padding: 11px 12px; }
}

@media (max-width: 560px) {
  .tool-grid, .topic-grid, .news-grid { grid-template-columns: 1fr; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .cat-card { padding: 14px 12px; }
  .cat-card p { display: none; }
  .hero-search input { padding-right: 100px; height: 50px; }
  .hero-search .go { padding: 0 18px; }
  .section { padding-top: 32px; }
  .footer-inner { grid-template-columns: 1fr 1fr; padding-top: 36px; gap: 24px; }
  .detail-stats { gap: 14px; }
  .toolbar .result { width: 100%; }
}