/* ============================================================
   固件发布站 · 全局样式
   风格：极简 · 白底 · 淡蓝主色 · 扁平 · 紧凑
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-blue: #eef4fb;
  --text: #1c2733;
  --text-2: #5a6b7b;
  --text-3: #8a9aa8;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-soft: #e8f0fe;
  --border: #e4e9f0;
  --success: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(28, 39, 51, 0.06), 0 4px 16px rgba(28, 39, 51, 0.06);
  --font: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, "Courier New", monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; display: block; }

.container { max-width: 980px; margin: 0 auto; padding: 0 24px; }

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 980px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 16px; color: var(--text);
}
.nav-brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--primary); display: inline-block;
}
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a { color: var(--text-2); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--primary); }
.nav-links .btn { margin-left: 4px; }

@media (max-width: 640px) {
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 13px; }
  .hide-sm { display: none; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; line-height: 1.5;
  border: 1px solid transparent; cursor: pointer;
  transition: all 0.15s ease; user-select: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover:not(:disabled) { background: var(--primary-soft); }
.btn-ghost { background: var(--bg-soft); color: var(--text); border-color: var(--border); }
.btn-ghost:hover:not(:disabled) { background: var(--border); }
.btn-lg { padding: 12px 28px; font-size: 15px; border-radius: 10px; }
.btn-block { width: 100%; justify-content: center; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover:not(:disabled) { background: #15803d; }

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 56px;
  background: linear-gradient(180deg, var(--bg-blue) 0%, var(--bg) 100%);
  text-align: center;
}
.hero .kicker {
  display: inline-block; font-size: 13px; font-weight: 600;
  color: var(--primary); background: var(--primary-soft);
  padding: 4px 14px; border-radius: 999px; margin-bottom: 20px;
}
.hero h1 { font-size: 44px; font-weight: 800; letter-spacing: -0.5px; line-height: 1.25; }
.hero .sub { margin: 16px auto 32px; max-width: 560px; color: var(--text-2); font-size: 17px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero .meta { margin-top: 28px; color: var(--text-3); font-size: 13px; }

@media (max-width: 640px) {
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 32px; }
}

/* ---------- 区块 ---------- */
.section { padding: 56px 0; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 26px; font-weight: 800; letter-spacing: -0.3px; }
.section-title p { color: var(--text-2); margin-top: 8px; font-size: 15px; }

/* 特性卡片 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 768px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.feature .icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--primary-soft); color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; margin-bottom: 14px;
}
.feature h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.feature p { font-size: 13.5px; color: var(--text-2); }

/* ---------- 卡片/面板 ---------- */
.card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px;
}
.card + .card { margin-top: 16px; }

/* ---------- 刷机页 ---------- */
.flash-wrap { max-width: 720px; margin: 0 auto; padding: 48px 0 72px; }
.flash-steps {
  display: flex; gap: 8px; margin-bottom: 28px;
  counter-reset: step;
}
.flash-steps .step {
  flex: 1; text-align: center; padding: 10px 8px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg-soft); color: var(--text-3);
  font-size: 13px; font-weight: 600; position: relative;
}
.flash-steps .step.active {
  background: var(--primary-soft); border-color: var(--primary);
  color: var(--primary);
}
.flash-steps .step.done {
  background: #e7f6ec; border-color: #bbe6c8; color: var(--success);
}

/* 进度条 */
.progress-wrap { margin-top: 16px; }
.progress-bar {
  height: 8px; background: var(--bg-soft);
  border: 1px solid var(--border); border-radius: 999px; overflow: hidden;
}
.progress-bar .fill {
  height: 100%; width: 0%; border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), #60a5fa);
  transition: width 0.2s ease;
}
.progress-text { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--text-3); margin-top: 6px; }

/* 日志 */
.log {
  margin-top: 16px; background: #0f172a; color: #cbd5e1;
  border-radius: var(--radius-sm); padding: 14px 16px;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.6;
  max-height: 220px; overflow-y: auto; white-space: pre-wrap; word-break: break-all;
}
.log .ok { color: #4ade80; }
.log .err { color: #f87171; }
.log .info { color: #93c5fd; }

/* 表单 */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-2); }
.select, .input {
  width: 100%; padding: 10px 14px; font-size: 14px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--bg); color: var(--text); outline: none;
  font-family: var(--font);
}
.select:focus, .input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

/* 单选卡片 */
.radio-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.radio-card {
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 16px; cursor: pointer; transition: all 0.15s ease;
  background: var(--bg);
}
.radio-card:hover { border-color: var(--primary); }
.radio-card.selected { border-color: var(--primary); background: var(--primary-soft); }
.radio-card .t { font-weight: 700; font-size: 14px; }
.radio-card .d { font-size: 12.5px; color: var(--text-2); margin-top: 2px; }

/* 文件清单 */
.file-list { border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; margin-top: 12px; }
.file-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; font-size: 13.5px; border-bottom: 1px solid var(--border);
}
.file-row:last-child { border-bottom: none; }
.file-row .off { font-family: var(--mono); color: var(--text-3); font-size: 12.5px; }
.file-row .sz { font-family: var(--mono); color: var(--text-3); font-size: 12px; }

/* 徽章 */
.badge {
  display: inline-block; font-size: 12px; font-weight: 600;
  padding: 2px 10px; border-radius: 999px;
}
.badge-blue { background: var(--primary-soft); color: var(--primary); }
.badge-green { background: #e7f6ec; color: var(--success); }
.badge-gray { background: var(--bg-soft); color: var(--text-2); border: 1px solid var(--border); }

/* ---------- 下载表 ---------- */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
  text-align: left; padding: 12px 14px; font-size: 13.5px;
  border-bottom: 1px solid var(--border);
}
.table th { font-weight: 700; color: var(--text-2); background: var(--bg-soft); font-size: 12.5px; }
.table tr:hover td { background: var(--bg-soft); }
.mono { font-family: var(--mono); font-size: 12.5px; color: var(--text-2); }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0; margin-top: 48px;
  color: var(--text-3); font-size: 13px; text-align: center;
}
.footer .links { margin-bottom: 8px; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.footer .links a { color: var(--text-2); }
.footer .links a:hover { color: var(--primary); }

/* ---------- FAQ ---------- */
.faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 15px; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: "+"; color: var(--text-3); font-size: 18px; }
.faq-item[open] summary::after { content: "−"; }
.faq-item .ans { margin-top: 10px; color: var(--text-2); font-size: 14px; padding-right: 24px; }

/* ---------- 提示条 ---------- */
.notice {
  display: flex; gap: 10px; align-items: flex-start;
  background: #fff8ec; border: 1px solid #f3d9a4;
  color: #8a5a00; border-radius: var(--radius-sm);
  padding: 12px 16px; font-size: 13.5px; margin: 16px 0;
}
.notice.info { background: var(--primary-soft); border-color: #bcd3f7; color: #1d4ed8; }
.notice.danger { background: #fef2f2; border-color: #f5c2c2; color: #b91c1c; }

/* ---------- 文档 ---------- */
.doc h1 { font-size: 28px; font-weight: 800; margin: 40px 0 16px; }
.doc h2 { font-size: 20px; font-weight: 700; margin: 32px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.doc h3 { font-size: 16px; font-weight: 700; margin: 20px 0 8px; }
.doc p, .doc li { color: var(--text-2); font-size: 14.5px; }
.doc ul, .doc ol { padding-left: 22px; margin: 8px 0; }
.doc code {
  font-family: var(--mono); font-size: 13px;
  background: var(--bg-soft); border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 5px;
}
.doc pre {
  background: #0f172a; color: #cbd5e1; padding: 16px;
  border-radius: var(--radius-sm); overflow-x: auto;
  font-family: var(--mono); font-size: 13px; margin: 12px 0;
}
.doc table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px; }
.doc table th, .doc table td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.doc table th { background: var(--bg-soft); }

/* ---------- 下载列表 ---------- */
.dl-item {
  display: flex; align-items: center; gap: 16px;
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; margin-bottom: 12px;
}
.dl-item .meta { flex: 1; }
.dl-item .meta .v { font-weight: 700; font-size: 15px; }
.dl-item .meta .d { font-size: 12.5px; color: var(--text-3); margin-top: 2px; }
.dl-item .actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* 提示气泡（毛玻璃） */
.modal-mask {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15, 23, 42, 0.4);
  display: none; align-items: center; justify-content: center;
}
.modal-mask.show { display: flex; }
.modal {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-radius: 16px; border: 1px solid rgba(255,255,255,0.6);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25);
  padding: 28px; width: min(420px, calc(100vw - 48px));
  text-align: center;
}
.modal h3 { font-size: 17px; margin-bottom: 8px; }
.modal p { color: var(--text-2); font-size: 14px; }
.modal .actions { display: flex; gap: 10px; justify-content: center; margin-top: 20px; }

/* 加载动画 */
.spinner {
  width: 20px; height: 20px; border-radius: 50%;
  border: 3px solid var(--primary-soft); border-top-color: var(--primary);
  animation: spin 0.8s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 空态 */
.empty { text-align: center; padding: 40px 0; color: var(--text-3); font-size: 14px; }