/* =====================================================================
   AntiMicroX 官方网站 - 主样式表
   版本: 1.0.0
   配色: 基于 logo 提取 (深蓝灰 + 玫红/亮黄/天蓝/嫩绿)
   风格: 扁平 / 现代 / 专业
   ===================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  /* 主色调 */
  --c-primary:        #3B5E7C;
  --c-primary-dark:   #2C4A63;
  --c-primary-light:  #5B7E9C;
  --c-primary-soft:   #EAF1F7;

  /* 强调色 (来自 logo) */
  --c-pink:    #EB5A8A;
  --c-yellow:  #FFD43B;
  --c-blue:    #74C0FC;
  --c-green:   #69DB7C;

  /* 中性色 */
  --c-bg:       #FFFFFF;
  --c-surface:  #F8F9FA;
  --c-surface-2:#F1F3F5;
  --c-border:   #DEE2E6;
  --c-text:     #1A202C;
  --c-text-2:   #495057;
  --c-text-3:   #868E96;
  --c-white:    #FFFFFF;

  /* 功能色 */
  --c-success:  #2F9E44;
  --c-warning:  #F08C00;
  --c-danger:   #E03131;

  /* 字体 */
  --font-sans:  "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono:  "JetBrains Mono", "SFMono-Regular", "Consolas", "Courier New", monospace;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-pill: 999px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .04);
  --shadow:    0 2px 8px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, .10), 0 4px 8px rgba(15, 23, 42, .06);
  --shadow-xl: 0 24px 64px rgba(15, 23, 42, .14), 0 8px 16px rgba(15, 23, 42, .08);

  /* 布局 */
  --container: 1200px;
  --header-h:  72px;

  /* 动效 */
  --ease: cubic-bezier(.4, 0, .2, 1);
  --t-fast: .15s;
  --t:      .25s;
  --t-slow: .4s;
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-decoration: none; transition: color var(--t-fast) var(--ease); }
a:hover { color: var(--c-pink); }
ul, ol { padding-left: 1.25em; }
button { font-family: inherit; cursor: pointer; border: 0; background: transparent; }
:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; border-radius: 4px; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-text);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }
p  { margin: 0 0 var(--space-4); color: var(--c-text-2); }
small { color: var(--c-text-3); }
code, kbd, samp { font-family: var(--font-mono); font-size: .9em; }
code {
  background: var(--c-surface-2);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--c-pink);
}
pre {
  background: var(--c-primary-dark);
  color: #E2E8F0;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .875rem;
  line-height: 1.6;
}
pre code { background: transparent; color: inherit; padding: 0; }

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.section { padding: var(--space-9) 0; }
.section--tight { padding: var(--space-8) 0; }
.section--alt { background: var(--c-surface); }
.section--primary { background: var(--c-primary); color: var(--c-white); }
.section--primary h1, .section--primary h2, .section--primary h3,
.section--primary h4 { color: var(--c-white); }
.section--primary p { color: rgba(255,255,255,.85); }

.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}
@media (min-width: 600px) and (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--c-text);
}
.brand:hover { color: var(--c-text); }
.brand__logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}
.brand__name { letter-spacing: -0.02em; }
.brand__name span { color: var(--c-pink); }

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__link {
  color: var(--c-text-2);
  font-weight: 500;
  font-size: .95rem;
  padding: var(--space-2) 0;
  position: relative;
}
.nav__link:hover { color: var(--c-primary); }
.nav__link.is-active { color: var(--c-primary); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--c-primary);
  border-radius: 2px;
}
.nav__actions { display: flex; align-items: center; gap: var(--space-3); }

.nav__toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--radius);
  align-items: center;
  justify-content: center;
}
.nav__toggle span {
  display: block;
  width: 20px; height: 2px;
  background: var(--c-text);
  position: relative;
  transition: transform var(--t) var(--ease);
}
.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px; height: 2px;
  background: var(--c-text);
  transition: transform var(--t) var(--ease), top var(--t) var(--ease);
}
.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top:  6px; }
.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav__toggle span::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 900px) {
  .nav__menu {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--c-white);
    border-bottom: 1px solid var(--c-border);
    padding: var(--space-4) var(--space-5) var(--space-6);
    transform: translateY(-110%);
    transition: transform var(--t) var(--ease);
    box-shadow: var(--shadow-lg);
  }
  .nav.is-open .nav__menu { transform: translateY(0); }
  .nav__link { padding: var(--space-3) 0; border-bottom: 1px solid var(--c-surface-2); }
  .nav__toggle { display: inline-flex; }
  .nav__actions .btn--ghost { display: none; }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.4;
  border-radius: var(--radius);
  transition: all var(--t) var(--ease);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  text-align: center;
}
.btn--primary {
  background: var(--c-primary);
  color: var(--c-white);
  box-shadow: var(--shadow);
}
.btn--primary:hover {
  background: var(--c-primary-dark);
  color: var(--c-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}
.btn--accent {
  background: var(--c-pink);
  color: var(--c-white);
  box-shadow: 0 4px 12px rgba(235, 90, 138, .3);
}
.btn--accent:hover {
  background: #D74878;
  color: var(--c-white);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(235, 90, 138, .4);
}
.btn--ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-border);
}
.btn--ghost:hover {
  background: var(--c-primary-soft);
  border-color: var(--c-primary-light);
  color: var(--c-primary);
}
.btn--light {
  background: var(--c-white);
  color: var(--c-primary);
}
.btn--light:hover { background: var(--c-surface); color: var(--c-primary); }
.btn--lg { padding: var(--space-4) var(--space-6); font-size: 1.05rem; }
.btn--sm { padding: var(--space-2) var(--space-4); font-size: .875rem; }
.btn--block { display: flex; width: 100%; }
.btn__icon { width: 18px; height: 18px; flex: 0 0 18px; }

/* ---------- Hero 区 ---------- */
.hero {
  position: relative;
  padding: var(--space-9) 0 var(--space-8);
  background:
    radial-gradient(ellipse 80% 60% at 70% 0%, rgba(116, 192, 252, .15), transparent 60%),
    radial-gradient(ellipse 60% 40% at 0% 30%, rgba(235, 90, 138, .10), transparent 60%),
    linear-gradient(180deg, #F4F7FB 0%, #FFFFFF 100%);
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: var(--space-7);
  align-items: center;
}
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; text-align: center; }
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  color: var(--c-text-2);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: .85rem;
  font-weight: 500;
  margin-bottom: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.hero__badge .dot {
  width: 8px; height: 8px;
  background: var(--c-green);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(105, 219, 124, .2);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(105, 219, 124, .2); }
  50% { box-shadow: 0 0 0 8px rgba(105, 219, 124, .1); }
}
.hero h1 {
  margin-bottom: var(--space-5);
}
.hero h1 .accent { color: var(--c-pink); }
.hero__lead {
  font-size: 1.15rem;
  color: var(--c-text-2);
  margin-bottom: var(--space-6);
  max-width: 580px;
}
@media (max-width: 900px) { .hero__lead { margin-left: auto; margin-right: auto; } }
.hero__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
@media (max-width: 900px) { .hero__actions { justify-content: center; } }
.hero__stats {
  display: flex;
  gap: var(--space-7);
  flex-wrap: wrap;
}
@media (max-width: 900px) { .hero__stats { justify-content: center; } }
.hero__stat .num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1;
}
.hero__stat .label {
  font-size: .85rem;
  color: var(--c-text-3);
  margin-top: 4px;
}

/* Hero 视觉区 - 手柄示意 */
.hero__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero__logo {
  width: 100%;
  max-width: 460px;
  filter: drop-shadow(0 24px 48px rgba(59, 94, 124, .25));
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.hero__visual::before {
  content: "";
  position: absolute;
  inset: -10%;
  background: radial-gradient(circle at 50% 50%, rgba(116, 192, 252, .25), transparent 70%);
  z-index: -1;
  filter: blur(40px);
}

/* 浮动色块装饰 */
.hero__deco {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: .8;
  pointer-events: none;
}
.hero__deco--1 { top: 18%; left: 6%; width: 16px; height: 16px; background: var(--c-yellow); animation: float 5s ease-in-out infinite; }
.hero__deco--2 { top: 70%; left: 12%; width: 12px; height: 12px; background: var(--c-green); animation: float 4s ease-in-out infinite .5s; }
.hero__deco--3 { top: 25%; right: 8%; width: 14px; height: 14px; background: var(--c-pink); animation: float 5.5s ease-in-out infinite 1s; }
.hero__deco--4 { top: 78%; right: 14%; width: 18px; height: 18px; background: var(--c-blue); animation: float 4.5s ease-in-out infinite .3s; }

/* ---------- 通用区块 ---------- */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-7);
}
.section-head h2 { margin-bottom: var(--space-3); }
.section-head p {
  font-size: 1.05rem;
  color: var(--c-text-2);
}
.eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-pink);
  margin-bottom: var(--space-3);
}

/* ---------- 特性卡片 ---------- */
.feature-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), border-color var(--t) var(--ease);
  height: 100%;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}
.feature-card__icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  background: var(--c-primary-soft);
  color: var(--c-primary);
}
.feature-card__icon svg { width: 28px; height: 28px; }
.feature-card--pink   .feature-card__icon { background: rgba(235, 90, 138, .12); color: var(--c-pink); }
.feature-card--yellow .feature-card__icon { background: rgba(255, 212, 59, .18); color: #B58A00; }
.feature-card--blue   .feature-card__icon { background: rgba(116, 192, 252, .18); color: #1971C2; }
.feature-card--green  .feature-card__icon { background: rgba(105, 219, 124, .18); color: #2B8A3E; }
.feature-card h3 { margin-bottom: var(--space-3); }
.feature-card p { margin: 0; font-size: .95rem; }

/* ---------- 使用场景卡片 ---------- */
.scenario {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  overflow: hidden;
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
  height: 100%;
}
.scenario:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.scenario::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-pink));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t) var(--ease);
}
.scenario:hover::before { transform: scaleX(1); }
.scenario__icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  margin-bottom: var(--space-4);
}
.scenario__icon svg { width: 26px; height: 26px; }
.scenario h3 { font-size: 1.15rem; margin-bottom: var(--space-3); }
.scenario p { margin-bottom: var(--space-3); font-size: .95rem; }
.scenario__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}
.tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--c-surface-2);
  color: var(--c-text-2);
  border-radius: var(--radius-pill);
  font-size: .75rem;
  font-weight: 500;
}

/* ---------- 用户评价 ---------- */
.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
@media (max-width: 900px) { .testimonials { grid-template-columns: 1fr; } }
@media (min-width: 600px) and (max-width: 900px) { .testimonials { grid-template-columns: repeat(2, 1fr); } }

.testimonial {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  height: 100%;
  transition: box-shadow var(--t) var(--ease), transform var(--t) var(--ease);
}
.testimonial:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.testimonial__rating {
  display: flex;
  gap: 2px;
  color: var(--c-yellow);
}
.testimonial__rating svg { width: 18px; height: 18px; }
.testimonial__quote {
  flex: 1;
  color: var(--c-text-2);
  font-size: .95rem;
  line-height: 1.65;
  margin: 0;
  font-style: italic;
}
.testimonial__author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: 1px solid var(--c-surface-2);
}
.testimonial__avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-pink));
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}
.testimonial__name { font-weight: 600; color: var(--c-text); }
.testimonial__role { font-size: .8rem; color: var(--c-text-3); }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); counter-reset: step; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .steps { grid-template-columns: 1fr; } }

.step {
  position: relative;
  padding: var(--space-6);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  counter-increment: step;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--c-primary);
  opacity: .25;
  line-height: 1;
  margin-bottom: var(--space-3);
}
.step h3 { font-size: 1.1rem; margin-bottom: var(--space-3); }
.step p { font-size: .9rem; margin: 0; }

/* ---------- 下载区卡片 ---------- */
.platform-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), border-color var(--t) var(--ease);
  height: 100%;
  display: flex;
  flex-direction: column;
}
.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}
.platform-card--featured {
  border-color: var(--c-primary);
  border-width: 2px;
  position: relative;
}
.platform-card--featured::after {
  content: "推荐";
  position: absolute;
  top: -12px;
  left: var(--space-6);
  background: var(--c-pink);
  color: var(--c-white);
  font-size: .75rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: .05em;
}
.platform-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.platform-card__icon {
  width: 56px; height: 56px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-soft);
  color: var(--c-primary);
}
.platform-card__icon svg { width: 32px; height: 32px; }
.platform-card__title h3 { margin: 0; font-size: 1.2rem; }
.platform-card__title .ver { font-size: .85rem; color: var(--c-text-3); }
.platform-card__body { flex: 1; margin-bottom: var(--space-5); }
.platform-card__body p { font-size: .9rem; margin-bottom: var(--space-3); }
.platform-card__specs {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4);
  font-size: .85rem;
}
.platform-card__specs li {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px dashed var(--c-border);
  color: var(--c-text-2);
}
.platform-card__specs li:last-child { border-bottom: 0; }
.platform-card__specs li strong { color: var(--c-text); font-weight: 600; }
.platform-card__actions { display: flex; flex-direction: column; gap: var(--space-2); }

/* ---------- 二维码弹窗 ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
.modal.is-open { display: flex; }
.modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, .55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn var(--t) var(--ease);
}
.modal__panel {
  position: relative;
  background: var(--c-white);
  border-radius: var(--radius-xl);
  max-width: 760px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: slideUp var(--t-slow) var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px) scale(.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--t) var(--ease), transform var(--t) var(--ease);
}
.modal__close:hover { background: var(--c-surface-2); transform: rotate(90deg); }
.modal__close svg { width: 18px; height: 18px; color: var(--c-text-2); }
.modal__body { padding: var(--space-7); }
.modal__title { font-size: 1.6rem; margin-bottom: var(--space-2); text-align: center; }
.modal__subtitle { text-align: center; color: var(--c-text-2); margin-bottom: var(--space-6); }

.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 600px) { .qr-grid { grid-template-columns: 1fr; } }

.qr-item {
  text-align: center;
  padding: var(--space-5);
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
}
.qr-item__img {
  width: 200px;
  height: 200px;
  margin: 0 auto var(--space-4);
  background: var(--c-white);
  border-radius: var(--radius);
  padding: var(--space-2);
  box-shadow: var(--shadow);
}
.qr-item__img img { width: 100%; height: 100%; object-fit: contain; }
.qr-item__title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--space-2);
  color: var(--c-text);
}
.qr-item__title svg { width: 18px; height: 18px; vertical-align: -3px; margin-right: 6px; }
.qr-item__desc {
  font-size: .85rem;
  color: var(--c-text-3);
  margin: 0;
}
.qr-item__extra {
  margin-top: var(--space-3);
  font-size: .8rem;
  color: var(--c-text-2);
}
.qr-item__extra a { font-weight: 600; }

.modal__alt {
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--c-border);
  text-align: center;
  font-size: .9rem;
  color: var(--c-text-2);
}
.modal__alt a { font-weight: 600; }

/* ---------- CTA 区块 ---------- */
.cta-band {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%);
  color: var(--c-white);
  padding: var(--space-8) 0;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}
.cta-band::before, .cta-band::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  opacity: .12;
}
.cta-band::before {
  top: -100px; right: -50px;
  width: 320px; height: 320px;
  background: var(--c-pink);
}
.cta-band::after {
  bottom: -120px; left: -40px;
  width: 280px; height: 280px;
  background: var(--c-yellow);
}
.cta-band__inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.cta-band h2 { color: var(--c-white); margin-bottom: var(--space-4); }
.cta-band p { color: rgba(255,255,255,.85); margin-bottom: var(--space-6); font-size: 1.1rem; }
.cta-band__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--c-primary-dark);
  color: rgba(255,255,255,.85);
  padding: var(--space-8) 0 var(--space-5);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand .brand { color: var(--c-white); margin-bottom: var(--space-4); }
.footer-brand .brand__name span { color: var(--c-pink); }
.footer-brand p { color: rgba(255,255,255,.65); font-size: .9rem; max-width: 280px; }
.footer-col h4 {
  color: var(--c-white);
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  letter-spacing: .02em;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: var(--space-3); }
.footer-col a { color: rgba(255,255,255,.7); font-size: .9rem; }
.footer-col a:hover { color: var(--c-white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: .85rem;
  color: rgba(255,255,255,.6);
}
.footer-bottom a { color: rgba(255,255,255,.6); }
.footer-bottom a:hover { color: var(--c-white); }
.footer-social { display: flex; gap: var(--space-3); }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--t) var(--ease);
}
.footer-social a:hover { background: var(--c-pink); color: var(--c-white); }
.footer-social svg { width: 18px; height: 18px; }

/* ---------- 通用工具类 ---------- */
.text-center { text-align: center; }
.text-pink { color: var(--c-pink); }
.text-primary { color: var(--c-primary); }
.text-muted { color: var(--c-text-3); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mb-6 { margin-bottom: var(--space-6); }
.mx-auto { margin-left: auto; margin-right: auto; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.flex-wrap { flex-wrap: wrap; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: .75rem;
  font-weight: 600;
  background: var(--c-primary-soft);
  color: var(--c-primary);
}
.badge--pink { background: rgba(235, 90, 138, .12); color: var(--c-pink); }
.badge--green { background: rgba(105, 219, 124, .15); color: #2B8A3E; }
.badge--yellow { background: rgba(255, 212, 59, .18); color: #B58A00; }

/* ---------- FAQ 手风琴 ---------- */
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: box-shadow var(--t) var(--ease);
}
.faq-item.is-open { box-shadow: var(--shadow); }
.faq-item__q {
  width: 100%;
  text-align: left;
  padding: var(--space-5);
  font-weight: 600;
  font-size: 1rem;
  color: var(--c-text);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}
.faq-item__q:hover { color: var(--c-primary); }
.faq-item__icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--t) var(--ease);
  color: var(--c-primary);
}
.faq-item.is-open .faq-item__icon { transform: rotate(45deg); }
.faq-item__a {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t-slow) var(--ease);
}
.faq-item.is-open .faq-item__a { max-height: 600px; }
.faq-item__a-inner {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--c-text-2);
  font-size: .95rem;
  line-height: 1.7;
}

/* ---------- 教程页 ---------- */
.tutorial-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-7);
  align-items: start;
}
@media (max-width: 900px) { .tutorial-grid { grid-template-columns: 1fr; } }
.toc {
  position: sticky;
  top: calc(var(--header-h) + var(--space-5));
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}
@media (max-width: 900px) { .toc { position: static; } }
.toc h4 { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--c-text-3); margin-bottom: var(--space-4); }
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { margin-bottom: var(--space-2); }
.toc a { display: block; padding: 6px 10px; border-radius: var(--radius-sm); color: var(--c-text-2); font-size: .9rem; }
.toc a:hover { background: var(--c-white); color: var(--c-primary); }

.tutorial-content h2 { margin-top: var(--space-7); margin-bottom: var(--space-4); padding-bottom: var(--space-3); border-bottom: 2px solid var(--c-surface-2); }
.tutorial-content h2:first-child { margin-top: 0; }
.tutorial-content h3 { margin-top: var(--space-6); margin-bottom: var(--space-3); }
.tutorial-content img { border-radius: var(--radius-lg); border: 1px solid var(--c-border); margin: var(--space-5) 0; box-shadow: var(--shadow); }
.tutorial-content ul, .tutorial-content ol { color: var(--c-text-2); }
.tutorial-content li { margin-bottom: var(--space-2); }

.callout {
  background: var(--c-primary-soft);
  border-left: 4px solid var(--c-primary);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius);
  margin: var(--space-5) 0;
}
.callout--warning { background: rgba(255, 212, 59, .12); border-color: #B58A00; }
.callout--tip { background: rgba(105, 219, 124, .12); border-color: #2B8A3E; }
.callout strong { display: block; margin-bottom: var(--space-2); }

/* ---------- 关于页 ---------- */
.about-hero { background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-dark) 100%); color: var(--c-white); padding: var(--space-9) 0; }
.about-hero h1 { color: var(--c-white); }
.about-hero p { color: rgba(255,255,255,.85); font-size: 1.1rem; max-width: 720px; }

.timeline { position: relative; max-width: 720px; margin: 0 auto; padding-left: var(--space-6); }
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--c-border);
}
.timeline-item { position: relative; padding-bottom: var(--space-6); }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c-pink);
  border: 3px solid var(--c-white);
  box-shadow: 0 0 0 2px var(--c-pink);
}
.timeline-item__date { font-size: .85rem; color: var(--c-pink); font-weight: 700; margin-bottom: var(--space-2); }
.timeline-item h3 { margin-bottom: var(--space-2); }
.timeline-item p { margin: 0; font-size: .95rem; }

/* ---------- 工具栏 / 面包屑 ---------- */
.breadcrumb {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  font-size: .85rem;
  color: var(--c-text-3);
  margin-bottom: var(--space-5);
}
.breadcrumb a { color: var(--c-text-3); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb__sep { color: var(--c-text-3); }

/* ---------- 页面标题区 ---------- */
.page-hero {
  background: linear-gradient(180deg, var(--c-primary-soft) 0%, var(--c-white) 100%);
  padding: var(--space-8) 0 var(--space-7);
  text-align: center;
}
.page-hero h1 { margin-bottom: var(--space-3); }
.page-hero p { font-size: 1.1rem; max-width: 720px; margin: 0 auto; color: var(--c-text-2); }

/* ---------- 表格 ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.table th, .table td { padding: var(--space-4); text-align: left; border-bottom: 1px solid var(--c-border); }
.table th { background: var(--c-surface); font-weight: 600; color: var(--c-text); font-size: .9rem; }
.table td { color: var(--c-text-2); font-size: .9rem; }
.table tr:last-child td { border-bottom: 0; }
.table tr:hover td { background: var(--c-surface); }

/* ---------- 适配 prefers-reduced-motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}