/* ===========================
   蘑菇视频 - 主样式表
   高端女性成长社群官网
   =========================== */

/* --- CSS 变量 --- */
:root {
  --color-ivory: #faf8f4;
  --color-cream: #f5f0e8;
  --color-beige: #e8ddd0;
  --color-warm-grey: #c8bfb4;
  --color-taupe: #9e9088;
  --color-brown: #6b5c52;
  --color-dark: #2d2520;
  --color-rose: #c9a9a0;
  --color-blush: #e8d5cf;
  --color-gold: #b8a080;
  --color-text: #3a3028;
  --color-text-light: #7a6e66;
  --color-text-muted: #a09890;
  --font-serif: 'Georgia', 'Noto Serif SC', serif;
  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-xxl: 10rem;
  --border-radius: 2px;
  --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* --- 重置与基础 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-ivory);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

/* --- 排版 --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: normal;
  line-height: 1.4;
  color: var(--color-dark);
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.8rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1rem; }

p {
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 1rem;
}

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  font-family: var(--font-sans);
  margin-bottom: 1rem;
  display: block;
}

/* --- 容器 --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- 导航栏 --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 248, 244, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-beige);
  transition: var(--transition);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--color-dark);
  letter-spacing: 0.05em;
  font-weight: normal;
}

.nav-logo span {
  color: var(--color-gold);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-menu a {
  font-size: 0.875rem;
  color: var(--color-text-light);
  letter-spacing: 0.08em;
  position: relative;
  padding-bottom: 2px;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width 0.3s ease;
}

.nav-menu a:hover {
  color: var(--color-dark);
}

.nav-menu a:hover::after {
  width: 100%;
}

.nav-cta {
  background: var(--color-dark);
  color: var(--color-ivory) !important;
  padding: 0.6rem 1.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  border-radius: var(--border-radius);
}

.nav-cta::after {
  display: none !important;
}

.nav-cta:hover {
  background: var(--color-brown) !important;
}

/* --- 搜索框 --- */
.search-bar-wrapper {
  background: var(--color-cream);
  border-bottom: 1px solid var(--color-beige);
  padding: 0.6rem 2rem;
}

.search-bar-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-input {
  flex: 1;
  max-width: 400px;
  border: 1px solid var(--color-beige);
  background: var(--color-ivory);
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  color: var(--color-text);
  font-family: var(--font-sans);
  outline: none;
  border-radius: var(--border-radius);
  transition: border-color 0.3s;
}

.search-input:focus {
  border-color: var(--color-gold);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-btn {
  background: var(--color-dark);
  color: var(--color-ivory);
  border: none;
  padding: 0.45rem 1.2rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.search-btn:hover {
  background: var(--color-brown);
}

/* --- 汉堡菜单 --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--color-dark);
  transition: var(--transition);
}

/* --- 首屏 Hero --- */
.hero {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 120px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-main.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.88);
  transform: scale(1.02);
  transition: transform 8s ease;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(250,248,244,0.85) 40%, rgba(250,248,244,0.2) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
  padding: 0 2rem 0 6rem;
  animation: fadeInUp 1s ease both;
}

.hero-eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.hero-eyebrow::before {
  content: '';
  display: block;
  width: 30px;
  height: 1px;
  background: var(--color-gold);
}

.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  line-height: 1.25;
  color: var(--color-dark);
  margin-bottom: 1.5rem;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 2.5rem;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--color-dark);
  color: var(--color-ivory);
  padding: 0.9rem 2.2rem;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  border-radius: var(--border-radius);
  transition: var(--transition);
  display: inline-block;
}

.btn-primary:hover {
  background: var(--color-brown);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1px solid var(--color-dark);
  color: var(--color-dark);
  padding: 0.9rem 2.2rem;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  border-radius: var(--border-radius);
  transition: var(--transition);
  display: inline-block;
}

.btn-outline:hover {
  background: var(--color-dark);
  color: var(--color-ivory);
  transform: translateY(-2px);
}

/* --- 章节通用 --- */
.section {
  padding: var(--spacing-xl) 0;
}

.section-alt {
  background: var(--color-cream);
}

.section-dark {
  background: var(--color-dark);
  color: var(--color-ivory);
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--color-ivory);
}

.section-dark p {
  color: var(--color-beige);
}

.section-header {
  margin-bottom: 4rem;
}

.section-header.centered {
  text-align: center;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.05rem;
  max-width: 600px;
}

.section-header.centered p {
  margin: 0 auto;
}

/* --- 视频卡片 --- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.video-card {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  background: var(--color-beige);
}

.video-card-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.video-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.video-card:hover .video-card-thumb img {
  transform: scale(1.05);
}

.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background 0.3s ease;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .video-play-btn {
  opacity: 1;
  background: rgba(0,0,0,0.25);
}

.play-icon {
  width: 60px;
  height: 60px;
  background: rgba(250,248,244,0.92);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: transform 0.3s ease;
}

.video-card:hover .play-icon {
  transform: scale(1);
}

.play-icon::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--color-dark);
  margin-left: 4px;
}

.video-card-info {
  padding: 1.2rem;
  background: var(--color-ivory);
}

.video-card-info h4 {
  font-size: 0.95rem;
  color: var(--color-dark);
  margin-bottom: 0.4rem;
  font-family: var(--font-sans);
  font-weight: 500;
}

.video-card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.video-card-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* --- 社群模块 --- */
.community-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.community-image {
  border-radius: 4px;
  overflow: hidden;
}

.community-image img {
  width: 100%;
  height: 500px;
  object-fit: cover;
}

.keyword-matrix {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 2rem 0;
}

.keyword-tag {
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-beige);
  font-size: 0.82rem;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  border-radius: 20px;
  transition: var(--transition);
}

.keyword-tag:hover {
  border-color: var(--color-gold);
  color: var(--color-dark);
  background: var(--color-cream);
}

/* --- 理念模块 --- */
.philosophy-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 6rem;
  align-items: start;
}

.philosophy-quote {
  position: sticky;
  top: 140px;
}

.philosophy-quote blockquote {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  line-height: 1.7;
  color: var(--color-dark);
  border-left: 2px solid var(--color-gold);
  padding-left: 1.5rem;
}

.philosophy-items {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.philosophy-item {
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--color-beige);
}

.philosophy-item:last-child {
  border-bottom: none;
}

.philosophy-item h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--color-dark);
}

/* --- 成长路径 --- */
.growth-stages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.growth-stage {
  padding: 2.5rem;
  background: var(--color-ivory);
  border: 1px solid var(--color-beige);
  border-radius: 4px;
  transition: var(--transition);
}

.growth-stage:hover {
  border-color: var(--color-gold);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.stage-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  color: var(--color-beige);
  line-height: 1;
  margin-bottom: 1rem;
}

.growth-stage h3 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}

/* --- 成员卡片 --- */
.members-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.member-card {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  animation: fadeInUp 0.6s ease both;
}

.member-card-image {
  aspect-ratio: 3/4;
  overflow: hidden;
}

.member-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.member-card:hover .member-card-image img {
  transform: scale(1.04);
}

.member-card-info {
  padding: 1.5rem;
  background: var(--color-ivory);
  border: 1px solid var(--color-beige);
  border-top: none;
}

.member-card-info h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
  font-family: var(--font-sans);
  font-weight: 500;
}

.member-card-info .role {
  font-size: 0.8rem;
  color: var(--color-gold);
  margin-bottom: 0.8rem;
  letter-spacing: 0.05em;
}

.member-card-info p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-light);
  margin: 0;
}

/* --- 内容文章卡片 --- */
.content-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  border-radius: 4px;
  overflow: hidden;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
}

.article-card-image {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.article-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-card-image img {
  transform: scale(1.05);
}

.article-card-body {
  padding: 1.5rem;
  background: var(--color-ivory);
  border: 1px solid var(--color-beige);
  border-top: none;
}

.article-card-category {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 0.6rem;
  display: block;
}

.article-card-body h3 {
  font-size: 1rem;
  font-family: var(--font-sans);
  font-weight: 500;
  margin-bottom: 0.6rem;
  color: var(--color-dark);
  line-height: 1.5;
}

.article-card-body p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.7;
}

/* --- 评价模块 --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.testimonial-card {
  padding: 2.5rem;
  background: var(--color-ivory);
  border: 1px solid var(--color-beige);
  border-radius: 4px;
  position: relative;
}

.testimonial-card::before {
  content: '\201C';
  font-family: var(--font-serif);
  font-size: 5rem;
  color: var(--color-beige);
  position: absolute;
  top: 1rem;
  left: 2rem;
  line-height: 1;
}

.testimonial-text {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  padding-top: 1.5rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-beige);
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-taupe);
}

.testimonial-author-info h5 {
  font-size: 0.9rem;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--color-dark);
}

.testimonial-author-info span {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

/* --- FAQ --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-beige);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 1.5rem 0;
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: color 0.3s;
}

.faq-question:hover {
  color: var(--color-brown);
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: '';
  position: absolute;
  background: var(--color-gold);
  transition: transform 0.3s ease;
}

.faq-icon::before {
  width: 12px;
  height: 1px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  width: 1px;
  height: 12px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item.active .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 1.5rem;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.9;
  margin: 0;
}

/* --- 联系/加入模块 --- */
.join-section {
  position: relative;
  overflow: hidden;
}

.join-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/join-bg.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.6);
}

.join-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 8rem 2rem;
  color: var(--color-ivory);
}

.join-content h2 {
  color: var(--color-ivory);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  margin-bottom: 1.5rem;
}

.join-content p {
  color: rgba(250,248,244,0.85);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 2.5rem;
}

.btn-light {
  background: var(--color-ivory);
  color: var(--color-dark);
  padding: 1rem 2.5rem;
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  border-radius: var(--border-radius);
  transition: var(--transition);
  display: inline-block;
}

.btn-light:hover {
  background: var(--color-cream);
  transform: translateY(-2px);
}

/* --- 页脚 --- */
.site-footer {
  background: var(--color-dark);
  color: var(--color-beige);
  padding: 5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand h3 {
  font-size: 1.4rem;
  color: var(--color-ivory);
  margin-bottom: 1rem;
  font-family: var(--font-serif);
}

.footer-brand p {
  font-size: 0.88rem;
  color: var(--color-taupe);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.footer-col h4 {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-warm-grey);
  margin-bottom: 1.5rem;
  font-family: var(--font-sans);
  font-weight: normal;
}

.footer-col ul li {
  margin-bottom: 0.8rem;
}

.footer-col ul li a {
  font-size: 0.88rem;
  color: var(--color-taupe);
  transition: color 0.3s;
}

.footer-col ul li a:hover {
  color: var(--color-ivory);
}

.footer-qr-group {
  display: flex;
  gap: 1.5rem;
}

.footer-qr {
  text-align: center;
}

.footer-qr-box {
  width: 80px;
  height: 80px;
  background: var(--color-ivory);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.footer-qr-box svg {
  width: 60px;
  height: 60px;
}

.footer-qr p {
  font-size: 0.72rem;
  color: var(--color-taupe);
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-taupe);
  margin: 0;
}

.footer-bottom a {
  color: var(--color-taupe);
  transition: color 0.3s;
}

.footer-bottom a:hover {
  color: var(--color-ivory);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--color-taupe);
  transition: var(--transition);
}

.footer-social a:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* --- 动画 --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- 内页通用 --- */
.page-hero {
  padding: 160px 0 80px;
  background: var(--color-cream);
  text-align: center;
}

.page-hero .section-label {
  justify-content: center;
  display: flex;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  justify-content: center;
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: color 0.3s;
}

.breadcrumb a:hover {
  color: var(--color-dark);
}

.breadcrumb span {
  color: var(--color-beige);
}

/* --- 响应式 --- */
@media (max-width: 1024px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .growth-stages {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .philosophy-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .philosophy-quote {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-ivory);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    z-index: 999;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu a {
    font-size: 1.1rem;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero-content {
    padding: 0 1.5rem;
    max-width: 100%;
  }

  .community-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .members-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .growth-stages {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .members-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-outline {
    text-align: center;
  }
}

/* ===========================
   申请表单样式
   =========================== */
.join-form {
  max-width: 760px;
  margin: 0 auto;
  background: var(--color-ivory);
  padding: 3rem;
  border: 1px solid var(--color-beige);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.form-group label {
  font-size: 0.9rem;
  color: var(--color-brown);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.form-group .required {
  color: var(--color-rose);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-beige);
  background: #fff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  border-radius: var(--border-radius);
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(184, 160, 128, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
  line-height: 1.7;
}

.form-submit {
  text-align: center;
  margin-top: 2rem;
}

.form-errors {
  max-width: 760px;
  margin: 0 auto 2rem;
  padding: 1.5rem;
  background: #fff5f5;
  border: 1px solid #f5c6c6;
  border-radius: var(--border-radius);
}

.form-errors p {
  color: #c0392b;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.join-form-success {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 4rem 2rem;
  background: var(--color-cream);
  border: 1px solid var(--color-beige);
}

.join-form-success h3 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--color-dark);
  margin-bottom: 1rem;
}

.join-form-success p {
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ===========================
   色块书单卡片
   =========================== */
.article-card-image[style*="background"] {
  min-height: 180px;
}

/* ===========================
   共学日历活动卡片颜色
   =========================== */
.growth-stage .stage-number[style] {
  background: transparent;
  border: 2px solid var(--color-gold);
  color: var(--color-gold);
}

/* ===========================
   响应式补充
   =========================== */
@media (max-width: 768px) {
  .join-form {
    padding: 2rem 1.5rem;
  }
}