/* ============ 基础 ============ */
:root {
  --bg: #ffffff;
  --bg-soft: #f4f6fb;
  --card: #ffffff;
  --card-border: rgba(15, 23, 42, 0.10);
  --text: #0f172a;
  --text-dim: #5b667c;
  --accent: #4f6ef7;
  --accent-2: #9a6cff;
  --accent-3: #0d9488;
  --radius: 18px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ============ 背景装饰 ============ */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(108, 140, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 140, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}
.bg-orb-1 {
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(108, 140, 255, 0.5), transparent 70%);
  top: -120px; right: -80px;
  animation: float1 14s ease-in-out infinite;
}
.bg-orb-2 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(154, 108, 255, 0.4), transparent 70%);
  bottom: -140px; left: -100px;
  animation: float2 18s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-40px, 30px) scale(1.08); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.06); }
}

header, main, footer { position: relative; z-index: 1; }

/* ============ 导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid rgba(15, 23, 42, 0.05);
}
.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-logo {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  font-size: 20px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 18px rgba(108, 140, 255, 0.35);
}
.brand-name { font-size: 21px; font-weight: 800; letter-spacing: 0.5px; }
.brand-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 26px; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

/* 语言切换：中文 / EN 双标签，当前语言高亮 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  background: rgba(15, 23, 42, 0.05);
  border: 1px solid rgba(15, 23, 42, 0.13);
  padding: 3px;
  border-radius: 999px;
  transition: all 0.25s;
}
.lang-switch:hover { border-color: rgba(108, 140, 255, 0.55); background: rgba(108, 140, 255, 0.12); }
.lang-opt {
  border: 0;
  background: transparent;
  color: var(--text-dim);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  line-height: 1.2;
  transition: all 0.2s;
}
.lang-opt:hover { color: var(--text); }
.lang-opt.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 2px 8px rgba(108, 140, 255, 0.4);
}
.nav-links .lang-switch { margin-left: 4px; }

/* 复现成功案例区块 */
.r-case {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed rgba(15, 23, 42, 0.11);
}
.r-case-hd {
  font-size: 12px;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 3px;
  letter-spacing: 0.3px;
}
.r-case-link {
  display: block;
  font-size: 12px;
  line-height: 1.65;
  color: var(--accent);
  cursor: pointer;
  transition: color 0.2s;
}
.r-case-link:hover { color: var(--accent); text-decoration: underline; }
.r-card:hover .r-case-link { opacity: 1; }
.r-case-link { opacity: 0.92; }

/* ============ Hero ============ */
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 88px 24px 64px;
  text-align: center;
  animation: fadeUp 0.7s ease both;
}
.hero-title {
  font-size: clamp(40px, 6vw, 62px);
  font-weight: 800;
  letter-spacing: -1.5px;
  background: linear-gradient(120deg, #0f172a 20%, var(--accent) 55%, var(--accent-2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 20px;
}
.search-box {
  position: relative;
  max-width: 580px;
  margin: 0 auto;
}
.search-icon {
  position: absolute;
  left: 22px; top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  color: var(--text-dim);
  pointer-events: none;
}
#searchInput {
  width: 100%;
  padding: 17px 24px 17px 56px;
  border-radius: 18px;
  border: 1px solid var(--card-border);
  background: rgba(15, 23, 42, 0.04);
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s, background 0.25s;
}
#searchInput::placeholder { color: #64748b; }
#searchInput:hover { border-color: rgba(15, 23, 42, 0.13); }
#searchInput:focus {
  border-color: rgba(108, 140, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(108, 140, 255, 0.14);
}
/* ============ 应用区 ============ */
.apps {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}
.apps-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 28px;
}
.section-title { font-size: 26px; font-weight: 700; }
/* 区块内子分类标题（如工程师工具 · 标准查阅与下载） */
.tools-subcat { margin-top: 40px; margin-bottom: 22px; }
.tools-subcat .section-title {
  font-size: 20px;
  padding-left: 15px;
  position: relative;
}
.tools-subcat .section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 18px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.tools-subcat .apps-sub { font-size: 13px; color: var(--text-dim); }
.filters { display: flex; gap: 10px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: rgba(15, 23, 42, 0.03);
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover { color: var(--text); border-color: rgba(108, 140, 255, 0.4); }
.filter-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(108, 140, 255, 0.3);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}
.app-card {
  position: relative;
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 26px 24px 22px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.28s, box-shadow 0.28s;
  animation: fadeUp 0.5s ease both;
}
.app-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0;
  transition: opacity 0.28s;
}
.app-card:hover {
  transform: translateY(-6px);
  border-color: rgba(108, 140, 255, 0.35);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.32), 0 0 0 1px rgba(108, 140, 255, 0.12);
}
.app-card:hover::before { opacity: 1; }

.app-icon {
  width: 54px; height: 54px;
  display: grid; place-items: center;
  font-size: 28px;
  border-radius: 14px;
  margin-bottom: 16px;
  background: rgba(108, 140, 255, 0.12);
  border: 1px solid rgba(108, 140, 255, 0.18);
}

/* ============ 卡片项目图片 · 活动动效 ============ */
.r-card .r-icon {
  position: relative;
  width: 100%;
  height: 150px;
  border-radius: 14px;
  overflow: hidden;
  margin-bottom: 16px;
  display: block;
  background: linear-gradient(135deg, rgba(108, 140, 255, 0.10), rgba(46, 230, 200, 0.06));
  border: 1px solid var(--card-border);
}
.r-card .r-icon img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.55s cubic-bezier(0.2, 0.8, 0.2, 1), filter 0.55s;
}
/* flash 式扫光：周期光带扫过 */
.r-card .r-icon::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(115deg, transparent 32%, rgba(15, 23, 42, 0.11) 50%, transparent 68%);
  transform: translateX(-130%);
  animation: iconShine 3.6s ease-in-out infinite;
  pointer-events: none;
}
@keyframes iconShine {
  0% { transform: translateX(-130%); }
  55%, 100% { transform: translateX(130%); }
}
/* hover：扫光加速 + 图片放大 */
.r-card:hover .r-icon::after { animation-duration: 1s; }
.r-card:hover .r-icon img { transform: scale(1.09); filter: brightness(1.12); }
/* 卡片 hover 时图片容器流光边框 */
.r-card:hover .r-icon {
  border-color: rgba(108, 140, 255, 0.55);
  box-shadow: 0 0 0 1px rgba(108, 140, 255, 0.18), 0 8px 24px rgba(15, 23, 42, 0.26);
}
/* 弹窗内项目图标 */
.r-icon.proj-icon {
  width: 76px; height: 76px;
  border-radius: 16px;
  margin-bottom: 0;
  display: grid; place-items: center;
  font-size: 34px;
  flex-shrink: 0;
}
.r-icon.proj-icon img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: 16px;
}
.r-icon.proj-icon span { display: none; }
.app-name { font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.app-desc {
  color: var(--text-dim);
  font-size: 14px;
  min-height: 44px;
  margin-bottom: 14px;
}
.app-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.app-tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--accent-3);
  background: rgba(46, 230, 200, 0.08);
  border: 1px solid rgba(46, 230, 200, 0.18);
}
.app-open {
  position: absolute;
  right: 22px; bottom: 22px;
  display: flex; align-items: center; gap: 4px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.25s;
}
.app-card:hover .app-open { opacity: 1; transform: translateX(0); }

.empty-tip {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 0;
  font-size: 15px;
}

/* ============ 会员系统 ============ */
.nav-user { display: flex; align-items: center; gap: 10px; }
.btn-member {
  background: rgba(108, 140, 255, 0.12);
  border: 1px solid rgba(108, 140, 255, 0.35);
  color: var(--accent);
  padding: 7px 14px;
  border-radius: 9px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: all 0.25s;
  white-space: nowrap;
}
.btn-member:hover { background: rgba(108, 140, 255, 0.25); }
.btn-upgrade {
  background: linear-gradient(135deg, #ffd76c, #ff9a5a);
  border: none;
  color: #1a150a;
  font-weight: 700;
}
.btn-upgrade:hover { filter: brightness(1.1); }
.btn-logout { opacity: 0.7; }
.btn-logout:hover { opacity: 1; }
.user-chip {
  display: flex; align-items: center; gap: 7px;
  font-size: 13px;
  color: var(--text);
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid rgba(15, 23, 42, 0.08);
  padding: 5px 12px;
  border-radius: 9px;
  white-space: nowrap;
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.badge {
  font-size: 11px;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 700;
  flex-shrink: 0;
}
.badge-free { background: rgba(120, 140, 180, 0.15); color: #64748b; }
.badge-pro { background: linear-gradient(135deg, #ffd76c, #ff9a5a); color: #1a150a; }
.badge-trial { background: rgba(46, 230, 200, 0.16); color: var(--accent-3); }

.auth-gift {
  margin: 4px 0 10px; padding: 8px 12px; border-radius: 10px; font-size: 12.5px;
  background: rgba(46, 230, 200, 0.10); border: 1px dashed rgba(46, 230, 200, 0.45);
  color: var(--accent-3);
}

.promo-row { display: flex; gap: 8px; margin: 12px 0 4px; }
.promo-row .promo-input {
  flex: 1; background: var(--bg-soft); border: 1px solid var(--card-border); color: var(--text);
  border-radius: 10px; padding: 9px 12px; font-size: 13px; outline: none;
}
.promo-row .promo-input:focus { border-color: var(--accent); }
.promo-btn {
  background: var(--card); border: 1px solid var(--card-border); color: var(--text);
  border-radius: 10px; padding: 9px 14px; font-size: 13px; cursor: pointer; transition: all .2s;
}
.promo-btn:hover { border-color: var(--accent); color: var(--accent); }
.promo-status { font-size: 12px; min-height: 16px; margin: 4px 0 2px; }
.promo-status.ok { color: var(--accent-3); }
.promo-status.err { color: #d92d3f; }

.modal-mask {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.32);
  backdrop-filter: blur(8px);
  z-index: 1000;
}
.modal-mask:not([hidden]) {
  display: flex; align-items: center; justify-content: center;
}
.modal {
  background: #f1f4fa;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 18px;
  padding: 26px 26px 22px;
  width: 380px;
  max-width: 92vw;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  position: relative;
  animation: fadeUp 0.25s ease both;
}
.modal-close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none;
  color: var(--text-dim);
  font-size: 22px; line-height: 1;
  cursor: pointer;
  transition: color 0.2s;
}
.modal-close:hover { color: var(--text); }
.modal-title { font-size: 18px; font-weight: 800; margin-bottom: 16px; }
.auth-tabs {
  display: flex;
  background: rgba(15, 23, 42, 0.05);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 16px;
}
.auth-tab {
  flex: 1;
  padding: 8px;
  border: none;
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
}
.auth-tab.active { background: rgba(108, 140, 255, 0.2); color: var(--accent); font-weight: 700; }
.auth-input {
  width: 100%; box-sizing: border-box;
  padding: 11px 13px;
  margin-bottom: 12px;
  border-radius: 10px;
  border: 1px solid rgba(15, 23, 42, 0.11);
  background: rgba(15, 23, 42, 0.04);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.auth-input:focus { border-color: var(--accent); }
.auth-msg { color: #d92d3f; font-size: 12.5px; min-height: 18px; margin-bottom: 8px; }
.auth-msg.warn { color: #b45309; }
.btn-primary {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #6c8cff, #9a6cff);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: filter 0.25s;
}
.btn-primary:hover { filter: brightness(1.15); }
.benefit-list {
  margin: 4px 0 14px;
  display: flex; flex-direction: column; gap: 8px;
  font-size: 13.5px;
  color: var(--text-dim);
}
.benefit-list .ok { color: var(--text); }
.plan-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 12px; }
.plan-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 13px 16px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid rgba(15, 23, 42, 0.10);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  transition: all 0.25s;
}
.plan-item:hover { border-color: var(--accent); background: rgba(108, 140, 255, 0.1); }
.plan-price { color: #b45309; font-weight: 800; font-size: 16px; }

/* 支付方式选择（国内 / 国际） */
.channel-label { font-size: 12px; color: var(--text-dim); margin: 2px 0 6px; }
.channel-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.channel-btn {
  display: flex; flex-direction: column; gap: 2px; align-items: flex-start;
  background: var(--bg-soft); border: 1px solid var(--card-border); color: var(--text);
  border-radius: 10px; padding: 8px 12px; font-size: 13px; cursor: pointer;
  transition: all 0.2s; text-align: left;
}
.channel-btn:hover { border-color: var(--accent); }
.channel-btn.active { border-color: var(--accent); background: rgba(108, 140, 255, 0.14); }
.channel-tag { font-size: 11px; color: var(--text-dim); }

/* 支付结果面板（扫码 / 收款码 / 人工确认） */
.pay-box { text-align: center; padding: 4px 0 2px; }
.pay-title { font-size: 15px; font-weight: 700; margin: 0 0 4px; }
.pay-amount { font-size: 22px; font-weight: 800; color: #b45309; margin: 4px 0 2px; }
.pay-qr {
  /* object-fit:contain 必不可少：宽高被框成正方形，若上传的是非方形收款码截图，
     默认 fill 会把它压扁变形，二维码形变后直接扫不出来（等于收不到钱） */
  width: 260px; height: 260px; border-radius: 10px; background: #fff;
  padding: 6px; margin: 10px auto; display: block; object-fit: contain;
}
.pay-dim { font-size: 12px; color: var(--text-dim); margin: 4px 0 0; word-break: break-all; }
.pay-box .btn-primary { margin-top: 12px; }

/* 自愿捐献（与会员档位并列，虚线边框区分；金额自定） */
.plan-donate { border-style: dashed; }
.plan-donate .plan-price { font-size: 13px; font-weight: 700; color: var(--text-dim); }
.plan-donate:disabled { opacity: 0.5; cursor: not-allowed; }
.plan-donate:disabled:hover { border-color: rgba(15, 23, 42, 0.10); background: rgba(15, 23, 42, 0.04); }
.donate-box { text-align: center; padding: 4px 0 2px; }
.donate-amounts { justify-content: center; margin-top: 10px; }
.donate-input {
  width: 100%; box-sizing: border-box;
  padding: 11px 14px; margin: 6px 0 0;
  border-radius: 10px;
  background: var(--bg-soft); border: 1px solid var(--card-border);
  color: var(--text); font-size: 15px; font-family: inherit;
  text-align: center; transition: border-color 0.2s;
  /* 数字输入框的上下箭头在居中排版里很难看，且和预设金额按钮重复，去掉 */
  -moz-appearance: textfield; appearance: textfield;
}
.donate-input:focus { outline: none; border-color: var(--accent); }
.donate-input::-webkit-outer-spin-button,
.donate-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.donate-back { width: 100%; margin-top: 8px; }

.fav-btn {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 17px;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.45);
  z-index: 5;
  transition: transform 0.2s, color 0.2s;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}
.fav-btn:hover { transform: scale(1.2); color: #b45309; }
.fav-btn.on { color: #b45309; }

.toast {
  position: fixed;
  bottom: 28px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #e9edf6;
  border: 1px solid rgba(15, 23, 42, 0.13);
  color: var(--text);
  padding: 11px 20px;
  border-radius: 12px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 1200;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  .nav-user { gap: 6px; }
  .user-chip { max-width: 130px; }
  .btn-member { padding: 6px 10px; font-size: 12px; }
}

/* ============ 页脚 ============ */
.site-footer {
  text-align: center;
  padding: 28px 24px 40px;
  color: #6b7280;
  font-size: 14px;
  border-top: 1px solid rgba(15, 23, 42, 0.04);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ 响应式 ============ */
@media (max-width: 640px) {
  .hero { padding: 64px 20px 44px; }
  .app-grid { grid-template-columns: 1fr; }
  .nav-links a { font-size: 14px; }
}

/* ============ 分类筛选计数徽标 ============ */
.f-count {
  display: inline-block; min-width: 18px; margin-left: 6px; padding: 0 5px;
  font-size: 11px; line-height: 16px; text-align: center;
  border-radius: 999px; background: rgba(15, 23, 42, 0.06); color: var(--text-dim);
  transition: all 0.2s;
}
.filter-btn:hover .f-count { color: var(--accent); background: rgba(108, 140, 255, 0.15); }
.filter-btn.active .f-count { color: #fff; background: rgba(255, 255, 255, 0.22); }

/* ============ 卡片 TOP 热门徽章 ============ */
.r-top {
  position: absolute; top: 10px; left: 10px; z-index: 3;
  font-size: 11px; font-weight: 800; letter-spacing: 0.5px;
  color: #fff; padding: 3px 10px; border-radius: 999px;
  background: linear-gradient(135deg, #ffd76c, #ff9a5a);
  box-shadow: 0 2px 10px rgba(255, 180, 80, 0.45);
  animation: topPulse 2.6s ease-in-out infinite;
}
@keyframes topPulse {
  0%, 100% { box-shadow: 0 2px 10px rgba(255, 180, 80, 0.35); }
  50% { box-shadow: 0 2px 16px rgba(255, 180, 80, 0.7); }
}

/* ============ 搜索框清除按钮 ============ */
.search-clear {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  width: 26px; height: 26px; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(15, 23, 42, 0.06); color: var(--text-dim);
  font-size: 15px; line-height: 1;
  display: none; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.search-clear:hover { background: rgba(15, 23, 42, 0.13); color: var(--text); }
#searchInput.has-value { padding-right: 50px; }

/* ============ 回到顶部按钮 ============ */
.back-top {
  position: fixed; right: 22px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%; border: 0; cursor: pointer;
  font-size: 20px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 22px rgba(108, 140, 255, 0.4);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all 0.3s;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { filter: brightness(1.12); transform: translateY(-2px); }

/* ============ 导航滚动高亮 ============ */
.nav-links a.active { color: var(--text); position: relative; }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px; height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
}

/* ============ 移动端汉堡菜单 ============ */
.nav-toggle {
  display: none; border: 0; background: rgba(15, 23, 42, 0.05);
  color: var(--text); width: 38px; height: 38px; border-radius: 10px;
  font-size: 18px; cursor: pointer; align-items: center; justify-content: center;
}
@media (max-width: 820px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
    padding: 8px 24px 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; border-bottom: 1px dashed rgba(15, 23, 42, 0.05); }
  .nav-links .lang-switch { margin-top: 12px; align-self: flex-start; }
}
@media (max-width: 640px) {
  .back-top { right: 14px; bottom: 18px; width: 42px; height: 42px; }
}