/* ============================================================
   沧游一粟 · 云端统一样式（暗色 GitHub 风 · 8/29 重构）
   全站共用：index / download / docs / user-guide / faq
            feedback / login / register / v2 / server-info
   ============================================================ */

:root {
  --blue: #00c2ff;
  --purple: #8a4fff;
  --grad: linear-gradient(135deg, #00c2ff, #8a4fff);
  --grad-soft: linear-gradient(135deg, rgba(0,194,255,.12), rgba(138,79,255,.12));
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-card: #161b22;
  --text: #e6edf3;
  --text-2: #8b949e;
  --text-3: #6e7681;
  --border: rgba(230,237,243,.12);
  --border-strong: rgba(138, 79, 255, .45);
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 2px 14px rgba(0,0,0,.3);
  --shadow-hover: 0 10px 30px rgba(0, 194, 255, .10), 0 4px 16px rgba(138, 79, 255, .12);
  --purple-bright: #b18cff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 20px 48px; }

/* ═══════════ 顶部导航（全站统一） ═══════════ */
.nav {
  position: sticky; top: 0; z-index: 999;
  background: rgba(13, 17, 23, .82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-brand img { width: 36px; height: 36px; border-radius: 10px; }
.nav-brand-name {
  font-size: 18px; font-weight: 800; letter-spacing: .5px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.nav-brand-sub { font-size: 11px; color: var(--text-3); margin-top: -2px; }
.nav-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-links a {
  text-decoration: none; color: var(--text-2); font-size: 14px; font-weight: 500;
  padding: 7px 14px; border-radius: 999px; transition: all .2s;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.06); }
.nav-links a.nav-cta {
  color: #fff; background: var(--grad); font-weight: 600; margin-left: 6px;
  box-shadow: 0 4px 14px rgba(138, 79, 255, .28);
}
.nav-links a.nav-cta:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(138, 79, 255, .35); }

/* ═══════════ 品牌行（旧结构兼容：brand / brand-name / back） ═══════════ */
.brand { display: flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 800;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.brand-name { font-size: 20px; font-weight: 800; background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand-sub { font-size: 12px; color: var(--text-3); }
.back {
  color: var(--text-2); text-decoration: none; font-size: 13px;
  border: 1px solid var(--border); padding: 6px 16px; border-radius: 999px; transition: all .2s;
}
.back:hover { color: var(--purple-bright); border-color: var(--border-strong); background: var(--grad-soft); }

/* ═══════════ 公告卡 ═══════════ */
.notice-card {
  background: linear-gradient(135deg, rgba(0,194,255,.08), rgba(138,79,255,.08));
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 16px 20px; margin: 26px 0 6px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.notice-ico { font-size: 24px; }
.notice-body { flex: 1; min-width: 200px; }
.notice-title { font-size: 14.5px; font-weight: 700; color: var(--purple-bright); }
.notice-content { font-size: 13px; color: var(--text-2); margin-top: 2px; white-space: pre-wrap; line-height: 1.6; }
.notice-all {
  font-size: 12.5px; color: var(--purple-bright); text-decoration: none; white-space: nowrap;
  border: 1px solid var(--border-strong); padding: 6px 15px; border-radius: 999px; transition: all .2s;
}
.notice-all:hover { background: rgba(138,79,255,.15); }
.notice-card.empty { background: var(--bg-soft); border-color: var(--border); }

/* ═══════════ 首页 Hero ═══════════ */
.hero { text-align: center; padding: 74px 0 36px; position: relative; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(600px 260px at 20% 0%, rgba(0,194,255,.08), transparent 60%),
    radial-gradient(600px 260px at 80% 0%, rgba(138,79,255,.08), transparent 60%);
}
.hero-badge {
  display: inline-block; font-size: 12.5px; font-weight: 600; color: var(--purple-bright);
  background: var(--grad-soft); border: 1px solid var(--border-strong);
  padding: 5px 16px; border-radius: 999px; margin-bottom: 20px;
}
.hero h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 800; letter-spacing: 1px; line-height: 1.3; }
.hero .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin: 16px auto 0; max-width: 560px; font-size: 15.5px; color: var(--text-2); line-height: 1.9; }
.hero-cta { margin-top: 30px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  font-size: 15px; font-weight: 600; padding: 12px 28px; border-radius: 999px;
  background: var(--grad); color: #fff; box-shadow: 0 6px 20px rgba(138, 79, 255, .30);
  transition: all .2s; border: none; cursor: pointer;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(138, 79, 255, .38); }
.btn.ghost { background: var(--bg-soft); color: var(--purple-bright); border: 1.5px solid var(--border-strong); box-shadow: none; }
.btn.ghost:hover { background: var(--grad-soft); }

/* ═══════════ 分区标题 ═══════════ */
.section-title {
  font-size: 13px; font-weight: 700; color: var(--purple-bright); letter-spacing: 2px;
  margin: 52px 0 6px; display: flex; align-items: center; gap: 10px;
}
.section-title::before { content: ""; width: 26px; height: 3px; border-radius: 3px; background: var(--grad); }
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.section-name { font-size: 26px; font-weight: 800; margin-bottom: 20px; }
.section-name .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ═══════════ 卡片网格（通用） ═══════════ */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 22px; text-decoration: none; color: var(--text);
  transition: all .22s; display: block; box-shadow: var(--shadow);
}
.card:hover { border-color: transparent; box-shadow: var(--shadow-hover); transform: translateY(-3px);
  background: linear-gradient(var(--bg-card), var(--bg-card)) padding-box, var(--grad) border-box; }
.card .icon { font-size: 26px; }
.card .name { font-size: 16px; font-weight: 700; margin-top: 10px; }
.card .desc { font-size: 13px; color: var(--text-2); margin-top: 6px; line-height: 1.7; }
.card .tag2 {
  display: inline-block; margin-top: 12px; font-size: 11.5px; font-weight: 600;
  color: var(--purple-bright); background: var(--grad-soft); border: 1px solid var(--border-strong);
  padding: 2px 12px; border-radius: 999px;
}
.card.soon { opacity: .55; cursor: default; }
.card.soon:hover { border-color: var(--border); box-shadow: var(--shadow); transform: none; background: var(--bg-card); }
.soon-tag { display: inline-block; margin-top: 8px; font-size: 11px; color: var(--text-3);
  border: 1px dashed var(--border-strong); padding: 1px 10px; border-radius: 10px; }

/* ═══════════ 首页：产品能力区（1 大 + 2 小） ═══════════ */
.feature-grid { display: grid; grid-template-columns: 1.35fr 1fr 1fr; gap: 16px; }
.feature-card {
  border-radius: var(--radius-lg); padding: 30px 28px; position: relative; overflow: hidden;
  text-decoration: none; display: block; transition: all .22s;
}
.feature-card.main {
  background: linear-gradient(135deg, #00c2ff, #5b8cff 55%, #8a4fff); color: #fff;
  box-shadow: 0 14px 36px rgba(0, 194, 255, .25), 0 8px 24px rgba(138, 79, 255, .20);
}
.feature-card.main::after {
  content: ""; position: absolute; right: -40px; top: -40px; width: 180px; height: 180px;
  border-radius: 50%; background: rgba(255,255,255,.14); filter: blur(2px);
}
.feature-card.main::before {
  content: ""; position: absolute; right: 20px; bottom: -70px; width: 150px; height: 150px;
  border-radius: 50%; background: rgba(255,255,255,.10);
}
.feature-card .f-ico { font-size: 30px; }
.feature-card .f-name { font-size: 19px; font-weight: 800; margin-top: 14px; }
.feature-card .f-desc { font-size: 13.5px; line-height: 1.8; margin-top: 8px; }
.feature-card .f-steps { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; position: relative; z-index: 1; }
.feature-card .f-step {
  font-size: 12px; font-weight: 600; padding: 4px 14px; border-radius: 999px;
  background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.35);
}
.feature-card.sub {
  background: var(--bg-card); border: 1px solid var(--border); box-shadow: var(--shadow); color: var(--text);
}
.feature-card.sub:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: transparent;
  background: linear-gradient(var(--bg-card), var(--bg-card)) padding-box, var(--grad) border-box; }
.feature-card.sub .f-name { color: var(--text); }
.feature-card.sub .f-desc { color: var(--text-2); }
.feature-card .f-link { display: inline-block; margin-top: 16px; font-size: 13px; font-weight: 600; color: var(--purple-bright); }
.feature-card.main .f-link { color: rgba(255,255,255,.95); font-weight: 700; }

/* ═══════════ 下载区大卡 ═══════════ */
.dl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.dl-card {
  display: flex; gap: 18px; align-items: center; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 26px;
  text-decoration: none; color: var(--text); transition: all .22s; box-shadow: var(--shadow);
}
.dl-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: transparent;
  background: linear-gradient(var(--bg-card), var(--bg-card)) padding-box, var(--grad) border-box; }
.dl-ico {
  width: 56px; height: 56px; border-radius: 16px; flex-shrink: 0;
  background: var(--grad-soft); display: flex; align-items: center; justify-content: center; font-size: 26px;
}
.dl-name { font-size: 17px; font-weight: 700; }
.dl-desc { font-size: 12.8px; color: var(--text-2); margin-top: 4px; line-height: 1.7; }
.dl-pwd { display: inline-block; margin-top: 8px; font-size: 11.5px; font-weight: 600; color: #fbbf24;
  background: rgba(245,158,11,.12); border: 1px solid rgba(245,158,11,.35); padding: 2px 10px; border-radius: 999px; }

/* ═══════════ 页面标题（内容页） ═══════════ */
.page-title { font-size: 24px; font-weight: 800; margin: 34px 0 6px; }
.page-title .grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.page-sub { color: var(--text-2); font-size: 14px; margin-bottom: 26px; }

/* ═══════════ 内容卡片（user-guide / manual / faq / server-info） ═══════════ */
.card-box {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 34px 40px; box-shadow: var(--shadow);
}
.card-box h1 { font-size: 22px; margin-bottom: 14px; }
.card-box h2 { font-size: 17px; margin: 24px 0 10px; color: var(--purple-bright); }
.card-box h3 { font-size: 15px; margin: 18px 0 8px; color: var(--cyan); }
.card-box h4 { font-size: 14px; margin: 14px 0 6px; }
.card-box p { margin: 8px 0; color: var(--text-2); }
.card-box ul, .card-box ol { margin: 8px 0 8px 24px; color: var(--text-2); }
.card-box li { margin: 5px 0; }
.card-box strong { color: var(--text); }
.card-box blockquote {
  border-left: 3px solid var(--purple); background: var(--grad-soft);
  padding: 10px 16px; margin: 12px 0; border-radius: 0 10px 10px 0; color: var(--purple-bright);
}
.card-box blockquote p { color: inherit; }
.card-box code { background: rgba(138,79,255,.15); color: var(--purple-bright); padding: 2px 7px; border-radius: 5px; font-size: 13px; }
.card-box pre { background: #0f172a; color: #e2e8f0; padding: 14px 16px; border-radius: 12px; overflow-x: auto; margin: 12px 0; font-size: 13px; }
.card-box table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px; }
.card-box th, .card-box td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.card-box th { background: var(--grad-soft); color: var(--purple-bright); font-weight: 600; }
.card-box hr { border: none; border-top: 1px solid var(--border); margin: 22px 0; }

/* 兼容旧类名 .card（内容页曾用 .card 当内容容器） */
.wrap > .card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 34px 40px; box-shadow: var(--shadow); }
.wrap > .card h1 { font-size: 22px; margin-bottom: 14px; }
.wrap > .card h2 { font-size: 17px; margin: 24px 0 10px; color: var(--purple-bright); }
.wrap > .card h3 { font-size: 15px; margin: 18px 0 8px; color: var(--cyan); }
.wrap > .card h4 { font-size: 14px; margin: 14px 0 6px; }
.wrap > .card p { margin: 8px 0; color: var(--text-2); }
.wrap > .card ul, .wrap > .card ol { margin: 8px 0 8px 24px; color: var(--text-2); }
.wrap > .card li { margin: 5px 0; }
.wrap > .card strong { color: var(--text); }
.wrap > .card blockquote { border-left: 3px solid var(--purple); background: var(--grad-soft);
  padding: 10px 16px; margin: 12px 0; border-radius: 0 10px 10px 0; color: var(--purple-bright); }
.wrap > .card blockquote p { color: inherit; }
.wrap > .card code { background: rgba(138,79,255,.15); color: var(--purple-bright); padding: 2px 7px; border-radius: 5px; font-size: 13px; }
.wrap > .card table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px; }
.wrap > .card th, .wrap > .card td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.wrap > .card th { background: var(--grad-soft); color: var(--purple-bright); font-weight: 600; }
.wrap > .card hr { border: none; border-top: 1px solid var(--border); margin: 22px 0; }

/* ═══════════ 流程图（quick-setup） ═══════════ */
.step {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 26px 22px; box-shadow: var(--shadow); position: relative;
}
.step.optional { border: 1.5px dashed var(--border-strong); background: var(--bg-soft); }
.step-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.badge { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; color: #fff; flex-shrink: 0; }
.badge.b1 { background: linear-gradient(135deg, #22c55e, #16a34a); }
.badge.b2 { background: linear-gradient(135deg, #00c2ff, #2563eb); }
.badge.b3 { background: linear-gradient(135deg, #f59e0b, #d97706); }
.badge.b4 { background: linear-gradient(135deg, #8a4fff, #6d28d9); }
.step-title { font-size: 17px; font-weight: 700; }
.step-tag { font-size: 11.5px; padding: 2px 12px; border-radius: 999px; margin-left: auto; flex-shrink: 0; font-weight: 600; }
.tag-required { background: var(--grad-soft); color: var(--purple-bright); border: 1px solid var(--border-strong); }
.tag-optional { background: var(--bg-soft); color: var(--text-3); border: 1px solid var(--border); }
.step-desc { font-size: 13px; color: var(--text-2); margin-bottom: 12px; }
.step ol { margin: 0 0 0 22px; color: var(--text-2); }
.step li { margin: 7px 0; font-size: 14px; }
.step li b { color: var(--text); }
.alert { margin-top: 14px; padding: 10px 16px; border-radius: 12px; font-size: 13px; line-height: 1.8; }
.alert.warn { background: rgba(245,158,11,.10); border: 1px solid rgba(245,158,11,.30); color: #fbbf24; }
.alert.info { background: rgba(0,194,255,.10); border: 1px solid rgba(0,194,255,.32); color: #67e8f9; }
.alert.gray { background: var(--bg-soft); border: 1px solid var(--border); color: var(--text-2); }
.arrow { text-align: center; padding: 12px 0; color: var(--purple); font-size: 20px; opacity: .7; }
.arrow::before { content: "↓"; }

.sub-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.sub-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; box-shadow: var(--shadow); }
.sub-card h3 { font-size: 14.5px; margin-bottom: 10px; color: var(--purple-bright); }
.sub-card table { border-collapse: collapse; width: 100%; font-size: 12.5px; }
.sub-card th, .sub-card td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; }
.sub-card th { background: var(--grad-soft); color: var(--purple-bright); font-weight: 600; }
.sub-card ul { margin: 4px 0 0 18px; color: var(--text-2); font-size: 12.5px; }
.sub-card li { margin: 4px 0; }

/* ═══════════ 表单（feedback） ═══════════ */
.form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 30px 34px; box-shadow: var(--shadow); max-width: 640px; }
.f-item { margin-bottom: 20px; }
.f-label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.f-label .req { color: #f87171; }
.f-input, .f-textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 12px;
  padding: 11px 14px; font-size: 14px; font-family: inherit; color: var(--text);
  background: var(--bg); transition: all .2s; outline: none;
}
.f-input:focus, .f-textarea:focus { border-color: var(--purple); box-shadow: 0 0 0 3px rgba(138,79,255,.15); }
.f-input::placeholder, .f-textarea::placeholder { color: var(--text-3); }
.f-textarea { min-height: 140px; resize: vertical; }
.f-submit { background: var(--grad); color: #fff; border: none; font-size: 15px; font-weight: 600;
  padding: 12px 34px; border-radius: 999px; cursor: pointer; box-shadow: 0 6px 18px rgba(138,79,255,.28); transition: all .2s; }
.f-submit:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(138,79,255,.35); }
.f-submit:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.f-msg { margin-top: 14px; font-size: 13.5px; border-radius: 10px; padding: 10px 14px; display: none; }
.f-msg.ok { display: block; background: rgba(34,197,94,.10); border: 1px solid rgba(34,197,94,.32); color: #4ade80; }
.f-msg.err { display: block; background: rgba(225,29,72,.08); border: 1px solid rgba(225,29,72,.28); color: #f87171; }

/* ═══════════ 公告列表 ═══════════ */
.ntc { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 24px; margin-bottom: 14px; box-shadow: var(--shadow); }
.ntc-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.ntc-title { font-size: 15.5px; font-weight: 700; }
.ntc-time { font-size: 12px; color: var(--text-3); }
.ntc-body { font-size: 13.5px; color: var(--text-2); margin-top: 8px; white-space: pre-wrap; line-height: 1.8; }
.ntc-link { display: inline-block; margin-top: 10px; font-size: 13px; font-weight: 600;
  color: var(--purple-bright); text-decoration: none; }
.ntc-link:hover { text-decoration: underline; }

/* ═══════════ server-info ═══════════ */
.sub { font-size: 14px; color: var(--text-2); margin: 6px 0 16px; }
.tag { display: inline-block; font-size: 12px; font-weight: 600; margin: 4px 6px 4px 0;
  background: var(--grad-soft); color: var(--purple-bright); border: 1px solid var(--border-strong);
  padding: 4px 14px; border-radius: 999px; }

/* ═══════════ 免责声明 + 页脚 ═══════════ */
.disclaimer {
  margin-top: 46px; background: rgba(245,158,11,.06); border: 1px solid rgba(245,158,11,.22);
  border-radius: 14px; padding: 13px 20px; font-size: 12.8px; color: var(--text-3); line-height: 1.8; text-align: center;
}
.foot { text-align: center; margin-top: 28px; font-size: 12px; color: var(--text-3); line-height: 1.8; }
.foot a { color: var(--text-3); text-decoration: none; }
.foot a:hover { color: var(--purple-bright); text-decoration: underline; }

/* ═══════════ 侧边悬浮：问题反馈 ═══════════ */
.fb-float {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 999;
  display: flex; flex-direction: column; align-items: center; gap: 5px; padding: 13px 12px;
  background: rgba(22, 27, 34, .92); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-strong); border-radius: 16px; color: var(--purple-bright); text-decoration: none;
  font-size: 13px; font-weight: 600; box-shadow: 0 8px 28px rgba(0,0,0,.4); transition: all .2s;
}
.fb-float:hover { background: var(--grad-soft); border-color: var(--purple); transform: translateY(-50%) translateX(-2px); }
.fb-float .fb-ico { font-size: 20px; line-height: 1; }

/* ═══════════ 响应式 ═══════════ */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-card.main { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .sub-grid { grid-template-columns: 1fr; }
  .card-box, .wrap > .card { padding: 24px 20px; }
  .hero { padding: 48px 0 24px; }
  .fb-float { right: 10px; padding: 10px 8px; font-size: 12px; }
}