/* ============================================================
   VPNCU · base.css
   设计令牌 / Reset / 排版 / 按钮 / 头部 / 页脚 / 通用组件 / Reveal / 响应式
   冷彩青雾底 · 开发者工具风 · Inter 900 display
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 色板 */
  --bg: #E7F3F2;
  --panel: #F7FCFB;
  --panel2: #D8ECE9;
  --border: #C2DCD7;
  --accent: #19AD92;
  --accent-dark: #0D7F6A;
  --ink: #12312B;
  --muted: #52706A;
  --ok: #1E9E60;
  --warn: #C08A1E;
  --err: #C94A3D;
  --white: #FFFFFF;

  /* 国旗用色 */
  --f-red: #CE3B33;
  --f-navy: #27427D;

  /* 字体 */
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;

  /* 阴影 */
  --shadow-1: 0 1px 2px rgba(18,49,43,.04), 0 10px 24px rgba(18,49,43,.07);
  --shadow-2: 0 2px 4px rgba(18,49,43,.05), 0 16px 34px rgba(18,49,43,.10);

  /* 布局 */
  --gutter: 32px;
  --header-h: 68px;
  --max-w: 1360px;
  --radius: var(--r-md);
  --radius-lg: var(--r-lg);
  --radius-sm: var(--r-sm);

  /* 焦点环 */
  --focus-ring: 2px solid var(--accent);
  --focus-offset: 2px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font-family: var(--font-body);
  cursor: pointer;
}

input,
textarea,
select {
  font-family: var(--font-body);
}

::selection {
  background: var(--accent);
  color: var(--white);
}

/* 行内 code 防溢出 */
code {
  font-family: var(--font-mono);
  font-size: .92em;
  background: var(--panel2);
  padding: .12em .4em;
  border-radius: 4px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

pre {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

pre code {
  display: block;
  padding: 16px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow-wrap: normal;
  word-break: normal;
}

/* ---------- 排版层级 ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.2;
  letter-spacing: -.02em;
}

h1 {
  font-weight: 900;
  font-size: clamp(40px, 5vw, 72px);
}

h2 {
  font-weight: 900;
  font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing: -.02em;
}

h3 {
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 26px);
  letter-spacing: -.01em;
}

h4 {
  font-weight: 700;
  font-size: 17px;
}

p {
  color: var(--muted);
}

strong {
  color: var(--ink);
  font-weight: 600;
}

.no-break {
  white-space: nowrap;
}

/* ---------- 通用容器 ---------- */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.sec {
  padding-top: 72px;
  padding-bottom: 72px;
}

.section-head {
  margin-bottom: 40px;
}

.section-cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--accent-dark);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing: -.02em;
  color: var(--ink);
  line-height: 1.15;
}

.section-desc {
  margin-top: 10px;
  max-width: 640px;
  color: var(--muted);
  font-size: 15px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 30px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.3;
  border-radius: 11px;
  border: 1px solid transparent;
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
  min-height: 48px;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 6px 16px rgba(25,173,146,.28);
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--panel);
  color: var(--ink);
  border-color: var(--border);
  font-weight: 600;
}

.btn-secondary:hover {
  border-color: var(--accent);
  background: var(--bg);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
  min-height: 38px;
  border-radius: 9px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
  min-height: 54px;
}

/* 键盘焦点可见 */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
[role="tab"]:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

/* ---------- 头部导航 ---------- */
.site-head {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.head-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo {
  display: block;
  width: 34px;
  height: 34px;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.brand-zh {
  font-weight: 500;
  font-size: 15px;
  color: var(--muted);
  letter-spacing: .02em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

.main-nav > a,
.nav-more > button {
  display: inline-block;
  padding: 8px 13px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  border-radius: var(--r-sm);
  border: none;
  background: transparent;
  font-family: var(--font-body);
  cursor: pointer;
  line-height: 1.4;
}

.main-nav > a:hover,
.nav-more > button:hover {
  color: var(--ink);
  background: var(--panel2);
}

.main-nav > a[data-active="index"] {
  color: var(--ink);
  font-weight: 600;
}

.nav-more {
  position: relative;
}

.nav-more .caret {
  font-size: 10px;
  color: var(--muted);
  margin-left: 3px;
}

.nav-more .menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 168px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  padding: 6px;
  z-index: 60;
}

.nav-more:hover .menu,
.nav-more:focus-within .menu {
  display: block;
}

.nav-more .menu a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--muted);
  border-radius: var(--r-sm);
}

.nav-more .menu a:hover {
  color: var(--ink);
  background: var(--panel2);
}

.head-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switch {
  position: relative;
  font-size: 13px;
  color: var(--muted);
  padding: 7px 10px;
  border-radius: var(--r-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 36px;
}

.lang-switch:hover {
  color: var(--ink);
  background: var(--panel2);
}

.lang-switch .caret {
  font-size: 9px;
}

.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 148px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-2);
  padding: 6px;
  z-index: 60;
}

.lang-switch:hover .lang-menu,
.lang-switch:focus-within .lang-menu {
  display: block;
}

.lang-menu a {
  display: block;
  padding: 8px 12px;
  font-size: 13.5px;
  color: var(--muted);
  border-radius: var(--r-sm);
  white-space: nowrap;
}

.lang-menu a:hover {
  color: var(--ink);
  background: var(--panel2);
}

.lang-menu a.lang-active {
  color: var(--accent-dark);
  font-weight: 600;
}

.btn-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-dark);
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--panel);
  transition: background .18s ease, color .18s ease;
  min-height: 38px;
}

.btn-login:hover {
  background: var(--accent);
  color: var(--white);
}

/* 移动端汉堡 */
.hamburger {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--ink);
  border-radius: var(--r-sm);
}

.hamburger:hover {
  background: var(--panel2);
}

.hamburger svg {
  display: block;
  width: 22px;
  height: 22px;
}

html.nav-open {
  overflow: hidden;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--panel);
  overflow-y: auto;
  max-height: calc(100dvh - var(--header-h));
  overscroll-behavior: contain;
  z-index: 99;
  padding: 16px var(--gutter) 32px;
}

html.nav-open .mobile-menu {
  display: block;
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
}

.mobile-menu a {
  display: block;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  border-radius: var(--r-sm);
  min-height: 48px;
  display: flex;
  align-items: center;
}

.mobile-menu a:hover {
  background: var(--panel2);
}

.mobile-menu .mobile-lang {
  margin-top: 12px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.mobile-menu .mobile-lang a {
  font-size: 14px;
  color: var(--muted);
}

.mobile-menu .mobile-lang a.lang-active {
  color: var(--accent-dark);
  font-weight: 600;
}

/* ---------- Hero / Bento ---------- */
.hero {
  min-height: calc(100svh - var(--header-h));
  display: flex;
  align-items: center;
}

.hero-inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 28px var(--gutter) 36px;
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto auto auto;
  gap: 16px;
}

.cell {
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease;
  min-width: 0;
}

.cell:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.lv-a {
  background: var(--panel);
}

.lv-c {
  background: var(--panel2);
}

/* 主格 */
.c-main {
  grid-column: 1 / 8;
  grid-row: 1 / 2;
  padding: 42px 46px 38px;
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--accent-dark);
}

.kicker .k-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.hero h1 {
  margin-top: 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 4.2vw, 58px);
  line-height: 1.12;
  letter-spacing: -.025em;
  color: var(--ink);
}

.hero h1 .accent-word {
  color: var(--accent-dark);
  background: linear-gradient(transparent 68%, rgba(25,173,146,.22) 68%);
  border-radius: 2px;
}

.hero-sub {
  margin-top: 16px;
  max-width: 560px;
  font-size: 16px;
  color: var(--muted);
}

.hero-sub strong {
  color: var(--ink);
  font-weight: 600;
}

.cta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.btn-primary .arr {
  width: 15px;
  height: 15px;
  display: block;
  flex-shrink: 0;
}

.trust-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 24px;
}

.trust-row .t-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--muted);
}

.trust-row .t-item i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  flex-shrink: 0;
  font-style: normal;
}

/* 装置格 */
.c-device {
  grid-column: 8 / 13;
  grid-row: 1 / 3;
  position: relative;
  overflow: hidden;
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-svg {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 560px;
}

.dv-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  fill: var(--muted);
}

.dv-label {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--ink);
}

.dv-label-hl {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  fill: var(--accent-dark);
}

.dv-code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  fill: var(--muted);
}

.dv-status {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--muted);
}

.panel-body {
  filter: drop-shadow(0 14px 22px rgba(18,49,43,.11));
}

.glide-dot {
  animation: glide 5.6s linear infinite;
}

@keyframes glide {
  0%   { transform: translate(8px, 92px); opacity: 0; }
  7%   { opacity: 1; }
  25%  { transform: translate(45px, 104px); }
  50%  { transform: translate(75px, 130px); }
  75%  { transform: translate(104px, 156px); }
  93%  { opacity: 1; }
  100% { transform: translate(136px, 168px); opacity: 0; }
}

.pulse {
  animation: pulse 2.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: .35; }
}

@media (prefers-reduced-motion: reduce) {
  .glide-dot {
    animation: none;
    transform: translate(75px, 130px);
    opacity: 1;
  }
  .pulse {
    animation: none;
  }
  .cell,
  .btn-primary {
    transition: none;
  }
  .cell:hover {
    transform: none;
  }
}

/* 小格 */
.c-platforms { grid-column: 1 / 5; grid-row: 2 / 3; }
.c-flags     { grid-column: 5 / 8; grid-row: 2 / 3; }
.c-refund    { grid-column: 1 / 4; grid-row: 3 / 4; }
.c-coverage  { grid-column: 4 / 8; grid-row: 3 / 4; }
.c-signup    { grid-column: 8 / 13; grid-row: 3 / 4; }

.c-platforms,
.c-flags,
.c-refund,
.c-coverage,
.c-signup {
  padding: 20px 24px;
}

.cell-cap {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--accent-dark);
  text-transform: uppercase;
}

.platform-row {
  display: flex;
  align-items: center;
  gap: 8px 20px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.platform-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}

.platform-item:hover {
  color: var(--ink);
}

.pi {
  display: block;
  width: 18px;
  height: 18px;
  color: var(--accent-dark);
  flex-shrink: 0;
}

.flag-grid {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 12px 18px;
  margin-top: 14px;
}

.flag-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}

.fl {
  display: block;
  width: 26px;
  height: 18px;
  flex-shrink: 0;
  border-radius: 3px;
  overflow: hidden;
}

.fact-big {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -.01em;
  color: var(--ink);
  line-height: 1.3;
}

.fact-big .mono-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-dark);
}

.fact-sub {
  margin-top: 4px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 页脚 ---------- */
.site-foot {
  background: var(--panel);
  border-top: 1px solid var(--border);
  margin-top: 80px;
}

.foot-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 56px var(--gutter) 28px;
}

.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.foot-brand p {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--muted);
  max-width: 280px;
}

.foot-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: .02em;
}

.foot-col ul {
  list-style: none;
}

.foot-col li {
  margin-bottom: 8px;
}

.foot-col a {
  font-size: 13.5px;
  color: var(--muted);
  transition: color .15s ease;
}

.foot-col a:hover {
  color: var(--accent-dark);
}

.foot-hot {
  font-size: 13.5px;
  color: var(--muted);
}

.foot-hot a {
  display: inline-block;
  margin: 0 10px 8px 0;
  padding: 4px 10px;
  font-size: 12.5px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  color: var(--muted);
  transition: color .15s ease, border-color .15s ease;
}

.foot-hot a:hover {
  color: var(--accent-dark);
  border-color: var(--accent);
}

.foot-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.foot-copy {
  font-size: 13px;
  color: var(--muted);
}

.foot-legal {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.foot-legal a {
  font-size: 13px;
  color: var(--muted);
}

.foot-legal a:hover {
  color: var(--accent-dark);
}

/* ---------- 通用卡片 / 面板 ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease;
  min-width: 0;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.card-pad {
  padding: 24px 28px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--r-pill);
  background: var(--panel2);
  color: var(--accent-dark);
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  max-width: 100%;
  overflow: hidden;
  white-space: nowrap;
}

/* ---------- Reveal 滚动淡入 ---------- */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity .5s ease, transform .5s ease;
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.pending {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1120px) {
  :root {
    --gutter: 24px;
  }

  .hero {
    min-height: auto;
  }

  .bento {
    grid-template-columns: 1fr 1fr;
  }

  .c-main {
    grid-column: 1 / 3;
    grid-row: auto;
  }

  .c-device {
    grid-column: 1 / 3;
    grid-row: auto;
    min-height: 480px;
  }

  .c-platforms,
  .c-flags,
  .c-refund,
  .c-coverage {
    grid-column: auto;
    grid-row: auto;
  }

  .c-signup {
    grid-column: 1 / 3;
    grid-row: auto;
  }

  .hero h1 {
    font-size: 40px;
  }

  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 16px;
  }

  .main-nav,
  .nav-more {
    display: none;
  }

  .hamburger {
    display: inline-flex;
  }

  .head-right {
    margin-left: auto;
  }

  .hero h1 {
    font-size: clamp(28px, 8vw, 40px);
    line-height: 1.15;
  }

  .hero-sub {
    font-size: 15px;
  }

  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-row .btn {
    width: 100%;
  }

  .c-main {
    padding: 28px 24px;
  }

  .bento {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .c-platforms,
  .c-flags,
  .c-refund,
  .c-coverage,
  .c-signup {
    grid-column: 1 / 2;
    padding: 18px 20px;
  }

  .c-device {
    min-height: 360px;
  }

  .flag-grid {
    grid-template-columns: repeat(2, auto);
  }

  .foot-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .foot-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* 窄屏溢出防御 */
/* 1. 行内 code 已在上方 overflow-wrap:anywhere */
/* 2. 装饰性微倾斜 tilt 类在窄屏归零 */
@media (max-width: 640px) {
  .tilt {
    transform: none !important;
  }
}

/* 3. 绝对定位装饰元素防伸出视口 */
.decor-abs {
  overflow-x: clip;
}

/* 移动端防贴边 */
@media (max-width: 768px) {
  .wrap {
    padding-inline: var(--gutter);
  }
}

/* 按钮态文字垂直居中兜底 */
a[class*="btn"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* 390px 窄屏头部收纳 */
@media (max-width: 390px) {
  .head-inner {
    gap: 12px;
  }
  .brand-zh {
    display: none;
  }
  .lang-switch {
    display: none;
  }
  .btn-login {
    padding: 8px 14px;
    font-size: 13px;
    min-height: 34px;
  }
  .head-right {
    gap: 8px;
  }
}