/* 数友社区 · 视觉体系 v3 —— 酷炫 / 高级感 + 明暗双主题协调 */
:root {
  --brand: #4D6BFF;
  --brand-2: #7C5CFF;
  --brand-3: #2BD49B;
  --brand-strong: #3B55E6;
  --brand-soft: #EAF0FF;
  --ink: #0E1220;
  --ink-2: #161B2B;
  --text: #1F2330;
  --text-dim: #5A6472;
  --text-faint: #8F959E;
  --surface: #FFFFFF;
  --bg: #F4F6FC;
  --bg-2: #EDF0FA;
  --border: rgba(16,24,40,.08);
  --border-strong: rgba(16,24,40,.14);
  --on-accent: #FFFFFF;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.05), 0 2px 8px rgba(16,24,40,.04);
  --shadow-md: 0 10px 30px rgba(30,40,90,.10);
  --shadow-lg: 0 24px 60px rgba(30,40,90,.16);
  --glass: rgba(255,255,255,.62);
  --glass-brd: rgba(255,255,255,.5);
  --transition: 220ms cubic-bezier(.2,0,0,1);
}
[data-theme="dark"] {
  --brand: #7B8CFF; --brand-2: #9C7CFF; --brand-3: #39E0A5;
  --brand-strong: #96A8FF; --brand-soft: rgba(123,140,255,.16);
  --ink: #F0F2F7; --ink-2: #E4E7EF; --text: #E6E8EB; --text-dim: #A3ABB8; --text-faint: #6E7683;
  --surface: #171A22; --bg: #0B0D14; --bg-2: #12141C;
  --border: rgba(255,255,255,.08); --border-strong: rgba(255,255,255,.16);
  --on-accent: #0B1220;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4), 0 2px 8px rgba(0,0,0,.35);
  --shadow-md: 0 10px 30px rgba(0,0,0,.5); --shadow-lg: 0 24px 60px rgba(0,0,0,.6);
  --glass: rgba(23,26,34,.66); --glass-brd: rgba(255,255,255,.08);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(1000px 500px at 100% 0%, var(--brand-soft), transparent 60%),
    radial-gradient(800px 400px at 0% 100%, rgba(43,212,155,.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}
a { color: var(--brand); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--brand-strong); }
h1, h2, h3 { font-weight: 800; color: var(--ink); letter-spacing: -.3px; }
p { color: var(--text-dim); }
::selection { background: var(--brand-soft); }

.container { max-width: 1120px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* ---- 顶部应用栏（玻璃拟态）---- */
.app-bar {
  position: sticky; top: 0; z-index: 100;
  background: var(--glass);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom: 1px solid var(--border);
}
.app-bar-inner { display: flex; align-items: center; gap: 14px; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 800; font-size: 17px; letter-spacing: .2px; }
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; font-weight: 800; font-size: 19px;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(77,107,255,.35);
}
.brand-tagline { color: var(--text-faint); font-size: 13px; }
.app-bar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.theme-btn {
  width: 38px; height: 38px; padding: 0; border-radius: var(--radius-sm);
  background: rgba(16,24,40,.04); border: 1px solid var(--border); color: var(--text-dim); font-size: 16px;
  transition: all var(--transition);
}
[data-theme="dark"] .theme-btn { background: rgba(255,255,255,.06); }
.theme-btn:hover { background: var(--brand-soft); color: var(--brand); transform: rotate(12deg); }

/* ---- Hero（动态极光 + 玻璃徽章 + 渐变标题 + 发光按钮）---- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(150deg, #10142A 0%, #1B2140 45%, #2A2F55 75%, #1D2440 100%);
  color: #fff;
  padding: 92px 0 84px;
}
[data-theme="dark"] .hero { background: linear-gradient(150deg, #06070B 0%, #12142A 50%, #1B2050 100%); }
/* 动态光斑 */
.hero::before, .hero::after {
  content: ""; position: absolute; width: 620px; height: 480px; border-radius: 50%;
  filter: blur(90px); opacity: .55; pointer-events: none; mix-blend-mode: screen;
}
.hero::before {
  background: radial-gradient(circle, rgba(124,92,255,.65), transparent 60%);
  top: -120px; right: -80px; animation: float1 16s ease-in-out infinite alternate;
}
.hero::after {
  background: radial-gradient(circle, rgba(43,212,155,.45), transparent 60%);
  bottom: -160px; left: -60px; animation: float2 20s ease-in-out infinite alternate;
}
@keyframes float1 { to { transform: translate(-40px, 30px) scale(1.1); } }
@keyframes float2 { to { transform: translate(60px, -20px) scale(1.05); } }
.hero .inner { position: relative; max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.16);
  color: #E6E8EB; font-size: 13px; font-weight: 600;
  padding: 7px 15px; border-radius: 999px; margin-bottom: 24px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0,0,0,.2);
}
.hero h1 {
  color: transparent;
  background: linear-gradient(115deg, #fff 20%, #C9D6FF 50%, #7C8CFF 85%);
  -webkit-background-clip: text; background-clip: text;
  font-size: 54px; line-height: 1.12; margin: 0 0 18px; max-width: 820px; letter-spacing: -.8px;
  animation: reveal 0.7s ease both;
}
[data-theme="dark"] .hero h1 { background: linear-gradient(115deg, #F0F2F7 20%, #B4C1FF 55%, #9C7CFF 90%); -webkit-background-clip: text; background-clip: text; }
@keyframes reveal { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.hero .lead { color: rgba(255,255,255,.78); font-size: 19px; max-width: 660px; margin: 0 0 36px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 50px; padding: 0 28px; border-radius: 14px;
  font-size: 15px; font-weight: 700; font-family: inherit; cursor: pointer;
  transition: transform .14s, box-shadow var(--transition), background var(--transition);
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn.primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff;
  box-shadow: 0 10px 32px rgba(77,107,255,.42);
}
.btn.primary:hover { box-shadow: 0 14px 40px rgba(77,107,255,.55); transform: translateY(-2px); }
.btn.ghost-light { background: rgba(255,255,255,.10); color: #fff; border: 1px solid rgba(255,255,255,.2); backdrop-filter: blur(6px); }
.btn.ghost-light:hover { background: rgba(255,255,255,.18); }
.btn.ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn.ghost:hover { color: var(--text); border-color: var(--border-strong); }

/* ---- 主体 ---- */
main.container { padding-top: 32px; padding-bottom: 90px; }
.section-title { display: flex; align-items: baseline; gap: 10px; margin: 42px 0 20px; }
.section-title h2 { font-size: 23px; margin: 0; position: relative; }
.section-title h2::after { content: ""; position: absolute; left: 0; bottom: -7px; width: 34px; height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--brand), var(--brand-2)); }
.section-title small { color: var(--text-faint); font-size: 13px; }

.card {
  background: var(--glass);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-brd);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 24px 26px;
  margin-bottom: 20px;
}

/* ---- 价值卡片 ---- */
.value-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 14px 0 8px; }
.value-card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
  padding: 26px; overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.value-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(77,107,255,.06), transparent 55%); opacity: 0; transition: opacity var(--transition); }
.value-card:hover { box-shadow: var(--shadow-md); transform: translateY(-5px); border-color: var(--brand-soft); }
.value-card:hover::after { opacity: 1; }
.value-ico {
  width: 50px; height: 50px; border-radius: 14px; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 24px;
  box-shadow: 0 6px 20px rgba(77,107,255,.3); position: relative;
}
.value-card h3 { font-size: 16.5px; margin: 0 0 7px; position: relative; }
.value-card p { font-size: 14px; margin: 0; color: var(--text-dim); position: relative; }

/* ---- 搜索 / 认证 / 发帖 ---- */
.search-card form { display: flex; gap: 10px; }
.search-card input { flex: 1; }
.auth-fields { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.auth-fields input { flex: 1 1 170px; }
.auth-msg { color: #E5484D; font-size: 13px; margin-left: 4px; }
.login-cta { color: var(--text-dim); font-size: 14px; display: flex; align-items: center; gap: 10px; }
.composer h2 { margin-bottom: 3px; }
.composer .hint { color: var(--text-faint); font-size: 13px; display: block; margin-bottom: 14px; }
.composer form { display: flex; flex-direction: column; gap: 12px; }
.composer form button { align-self: flex-start; }

/* ---- 输入框 ---- */
input[type="text"], input[type="search"], input[type="password"], textarea {
  height: 46px; padding: 0 15px; border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); font-size: 15px; font-family: inherit; color: var(--text);
  background: var(--surface); outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
textarea { height: auto; min-height: 130px; padding: 13px 15px; resize: vertical; line-height: 1.6; }
input::placeholder, textarea::placeholder { color: var(--text-faint); }
input:focus, textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 4px var(--brand-soft); }

/* ---- 按钮（通用）---- */
button {
  height: 46px; padding: 0 24px; border: none; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 700; font-family: inherit; cursor: pointer;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff;
  box-shadow: 0 6px 20px rgba(77,107,255,.22);
  transition: transform .12s, box-shadow var(--transition), background var(--transition);
}
button:hover { box-shadow: 0 8px 26px rgba(77,107,255,.32); transform: translateY(-1px); }
button:active { transform: translateY(1px); }
button:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
button.secondary { background: var(--bg-2); color: var(--ink); box-shadow: none; }
button.secondary:hover { background: rgba(16,24,40,.08); box-shadow: none; }
[data-theme="dark"] button.secondary { background: rgba(255,255,255,.08); }
[data-theme="dark"] button.secondary:hover { background: rgba(255,255,255,.14); }
button.ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); box-shadow: none; }
button.ghost:hover { color: var(--text); border-color: var(--border-strong); box-shadow: none; transform: none; }

/* ---- 帖子 ---- */
.posts { display: flex; flex-direction: column; gap: 15px; }
.post {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm); padding: 22px 24px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.post:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--brand-soft); }
.post h3 { margin: 0 0 9px; font-size: 17.5px; }
.post .body { margin: 0 0 15px; color: var(--text-dim); white-space: pre-wrap; }
.post .meta { font-size: 12.5px; color: var(--text-faint); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.tag { display: inline-flex; align-items: center; height: 27px; padding: 0 13px; border-radius: 999px; font-size: 12.5px; font-weight: 600; border: 1px solid transparent; }
.tag { background: var(--brand-soft); color: var(--brand); }
.tag.green { background: rgba(0,181,120,.12); color: #00A868; border-color: rgba(0,181,120,.2); }
.tag.orange { background: rgba(255,138,30,.12); color: #E97712; border-color: rgba(255,138,30,.2); }
.tag.purple { background: rgba(123,97,255,.12); color: #6A4DF0; border-color: rgba(123,97,255,.2); }
.tag.cyan { background: rgba(0,169,199,.12); color: #0090A8; border-color: rgba(0,169,199,.2); }
.tag.yellow { background: rgba(217,163,0,.12); color: #B98A00; border-color: rgba(217,163,0,.2); }
.tag.red { background: rgba(245,74,69,.12); color: #E5484D; border-color: rgba(245,74,69,.2); }
.tag.gray { background: rgba(100,106,115,.12); color: #646A73; border-color: rgba(100,106,115,.2); }
[data-theme="dark"] .tag { background: rgba(123,140,255,.14); color: #A0AFFF; }
[data-theme="dark"] .tag.green { background: rgba(57,224,165,.13); color: #39E0A5; border-color: rgba(57,224,165,.25); }
[data-theme="dark"] .tag.orange { background: rgba(255,176,77,.13); color: #FFB04D; border-color: rgba(255,176,77,.25); }
[data-theme="dark"] .tag.purple { background: rgba(156,124,255,.14); color: #A38CFF; border-color: rgba(156,124,255,.25); }
[data-theme="dark"] .tag.cyan { background: rgba(76,201,224,.13); color: #4CC9E0; border-color: rgba(76,201,224,.25); }
[data-theme="dark"] .tag.yellow { background: rgba(232,197,74,.13); color: #E8C54A; border-color: rgba(232,197,74,.25); }
[data-theme="dark"] .tag.red { background: rgba(255,138,138,.13); color: #FF8A8A; border-color: rgba(255,138,138,.25); }
[data-theme="dark"] .tag.gray { background: rgba(166,172,184,.13); color: #A6ACB8; border-color: rgba(166,172,184,.25); }

.empty { color: var(--text-faint); text-align: center; padding: 44px 0; }

/* ---- 页脚 ---- */
.site-footer { background: var(--surface); border-top: 1px solid var(--border); padding: 44px 0 52px; }
.site-footer .inner { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.site-footer .brand-line { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; }
.site-footer .mission { color: var(--text-faint); font-size: 14px; margin-top: 10px; }
.site-footer .foot-nav { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 18px; }
.site-footer .foot-nav a { color: var(--text-dim); font-size: 14px; }
.site-footer .copyright { color: var(--text-faint); font-size: 12.5px; margin-top: 24px; }

/* ---- 搜索结果页 ---- */
.search-head { margin-top: 30px; }

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .hero { padding: 60px 0 56px; }
  .hero h1 { font-size: 36px; }
  .hero .lead { font-size: 16px; }
  .value-row { grid-template-columns: 1fr; }
  .brand-tagline { display: none; }
}