/* ===== MYTHICAL HELPER - INDEX PAGE STYLES ===== */

/* ===== FOUNDATION STYLES ===== */

/* 引入字体 */
@import url('https://fonts.googleapis.com/css2?family=Cinzel+Decorative:wght@400;600;700;900&family=Inter:wght@400;500;600;700&display=swap');

/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  background: #0b1020;
  color: #fff;
  position: relative;
  z-index: 0;
  font-family: 'Inter', sans-serif;
}

/* Keep layout width stable across pages with/without scrollbar */
html { scrollbar-gutter: stable; }
@supports not (scrollbar-gutter: stable) {
  html { overflow-y: scroll; }
}

/* 容器和分割线 */
.index .container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

.index .section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  margin: 40px auto;
  max-width: 100%;
}

/* 全站星空背景 */
/* 1) 星云层：柔和的彩色光带 */
body::before {
  content: "";
  position: fixed;
  inset: -10% -10% 0 -10%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 40% at 20% 10%, rgba(129,206,255,.22), transparent 60%),
    radial-gradient(45% 35% at 80% 0%, rgba(255,224,138,.18), transparent 65%),
    radial-gradient(35% 30% at 10% 85%, rgba(175,140,255,.12), transparent 70%);
  filter: blur(18px) saturate(115%);
  opacity: .9;
}

/* 2) 星点层：稀疏的点光，带轻微闪烁 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: rgba(255,255,255,.85);
  box-shadow:
    2vw 8vh 0 rgba(255,255,255,.85),
    12vw 24vh 0 rgba(255,255,255,.6),
    22vw 10vh 0 rgba(255,255,255,.75),
    34vw 18vh 0 rgba(255,255,255,.5),
    46vw 6vh 0 rgba(255,255,255,.7),
    58vw 22vh 0 rgba(255,255,255,.55),
    70vw 12vh 0 rgba(255,255,255,.8),
    82vw 26vh 0 rgba(255,255,255,.5),
    10vw 32vh 0 rgba(255,255,255,.65),
    28vw 38vh 0 rgba(255,255,255,.6),
    44vw 34vh 0 rgba(255,255,255,.7),
    62vw 36vh 0 rgba(255,255,255,.5),
    78vw 40vh 0 rgba(255,255,255,.6),
    90vw 28vh 0 rgba(255,255,255,.55);
  animation: starTwinkle 3s ease-in-out infinite alternate;
  opacity: .7;
}

/* 闪烁动画 */
@keyframes starTwinkle {
  from { opacity: .45; transform: translateZ(0); }
  to { opacity: .9; }
}

/* 全站流星（随机位置，30秒周期） */
.meteor {
  position: fixed;
  z-index: 1;
  pointer-events: none;
  width: 140px;
  height: 2px;
  background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,.9));
  filter: drop-shadow(0 0 6px #fff);
  transform: rotate(18deg);
  animation: shooting 30s linear infinite;
  animation-delay: 0s;
}

.meteor:nth-child(2) {
  animation-delay: 10s;
  top: 25vh;
  left: -15vw;
}

.meteor:nth-child(3) {
  animation-delay: 20s;
  top: 8vh;
  left: -25vw;
}

@keyframes shooting {
  0% { transform: translate(0,0) rotate(18deg); opacity: 0; }
  10% { opacity: 1; }
  100% { transform: translate(140vw,45vh) rotate(18deg); opacity: 0; }
}

/* ===== HEADER SECTION ===== */

/* 为固定头部留出空间 */
body {
  padding-top: 80px;
}

.index .header { 
  position: fixed;
  top: 0; 
  left: 0;
  right: 0;
  z-index: 1000;
  background: #0b1020;
  border-bottom: 1px solid #2a3a63;
  padding: calc(env(safe-area-inset-top, 0px) + 12px) 0 12px 0;
  font-family: 'Inter', sans-serif;
}

.index .header .container { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
}

.index .header .brand { 
  display: flex; 
  align-items: center; 
  gap: 12px; 
  font-weight: 700; 
  letter-spacing: .2px; 
  font-size: 18px;
}

.index .header .brand .logo {
  height: 28px;
  width: auto;
  display: block;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
  border-radius: 50%;
}

.index .header .brand .name {
  font-family: 'Cinzel Decorative', serif;
  letter-spacing: .5px;
  font-weight: 700;
  background: linear-gradient(90deg, #ffffff, #ffe08a 55%, #c7e7ff 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.index .header .nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.index .header .nav a { 
  color: #fff;
  text-decoration: none; 
  padding: 6px 16px;
  border-radius: 8px; 
  transition: all 0.2s ease;
  font-weight: 500;
}

.index .header .nav a:hover {
  background: rgba(255,255,255,.08);
}

.index .header .nav a.active {
  background: #4d8dff;
  box-shadow: 0 2px 8px rgba(77,141,255,.25);
}

.index .header .lang-selector {
  margin-left: 8px;
}

.index .header .lang-selector select {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 8px;
  color: #fff;
  padding: 6px 12px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23ffffff' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 16px;
  padding-right: 32px;
}

.index .header .lang-selector select:hover {
  background-color: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.3);
}

.index .header .lang-selector select:focus {
  outline: none;
  border-color: #4d8dff;
  box-shadow: 0 0 0 3px rgba(77,141,255,.2);
}

/* ===== PAGE SECTIONS ===== */

/* Hero Section */
.index .hero {
  text-align: center;
  padding: 40px 0 0 0;
  position: relative;
  z-index: 10;
}

/* Hero Section 按钮样式 */
.index .hero .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  padding: 14px 28px;
}

.index .hero h1 {
  font-family: 'Cinzel Decorative', serif;
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, #ffffff, #ffe08a 55%, #c7e7ff 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.index .hero .lead {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1rem;
  line-height: 1.6;
  white-space: nowrap;
  margin-left: auto;
  margin-right: auto;
}

.index .hero .lead:nth-of-type(2) {
  margin-bottom: 2.5rem;
}

.index .hero .actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.index .hero .btn.primary { 
  background: linear-gradient(135deg, #8b5cf6, #7c3aed);
  color: #fff;
  font-weight: 600;
}

.index .hero .btn.primary:hover { 
  background: linear-gradient(135deg, #a855f7, #8b5cf6);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.3);
}

.index .hero .btn:not(.primary) {
  background: transparent;
  color: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.index .hero .btn:not(.primary):hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}

.index .hero .verse,
.index .hero .verse p {
  font-family: 'Inter', sans-serif;
  font-style: italic;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
  line-height: 1.4;
}

.index .hero .verse::before,
.index .hero .verse p::before {
  content: '"';
  color: #ffd700;
  font-size: 1.2em;
  margin-right: 4px;
}

.index .hero .verse::after,
.index .hero .verse p::after {
  content: '"';
  color: #ffd700;
  font-size: 1.2em;
  margin-left: 4px;
}

/* Board Section */
.index .board {
  padding: 0;
  position: relative;
}

.index .board .board-header {
  text-align: center;
  margin-bottom: 40px;
}

.index .board .board-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(22px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: .3px;
  color: #fff;
  margin: 0 0 20px;
}

.index .board .board-subtitle {
  font-size: 1.2rem;
  color: #e0e0e0;
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  margin: 0 auto 40px;
}

/* 外层两列：左=choices 右=letter（同一行，自然等高） */
.index .board .board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 20px;
  align-items: stretch;
}

/* 左列：把三张卡纵向排列 */
.index .board .board > .choices {
  grid-column: 1;
  display: grid;
  row-gap: 12px;
}

/* 右列：letter 就是第二列 */
.index .board .board > .letter {
  grid-column: 2;
}

/* Choice Cards */
.index .board .choice {
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  background: rgba(255,255,255,.04);
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
  cursor: default;
  outline: none;
  position: relative;
  overflow: hidden;
}

.index .board .choice:hover {
  transform: translateY(-2px);
  background: rgba(255,255,255,.06);
  border-color: #4d8dff;
}

/* 内层内容：把原先的 padding 挪到这里 */
.index .board .choice .choice-body {
  padding: 14px;
}

.index .board .choice-title {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px 0;
  color: #fff;
  text-shadow: 0 0 8px rgba(255,255,255,0.3);
}

.index .board .choice-desc {
  display: block;
  line-height: 1.3;
  min-height: unset;
}

.index .board .choice-desc .chip-item {
  font-family: 'Inter', sans-serif;
  display: block;
  line-height: 1.2;
  margin: 0 0 2px 0;
  color: rgba(255,255,255,.75);
  font-size: 13px;
}

.index .board .choice-desc .chip-item:last-child {
  margin-bottom: 0;
}

/* Card Stamps */
.index .board .card-stamp {
  position: absolute;
  bottom: -15px;
  right: -15px;
  width: 100px;
  height: 100px;
  opacity: 0.9;
  pointer-events: none;
  transition: opacity 0.2s ease, transform .18s ease;
  transform: rotate(8deg);
}

.index .board .choice:hover .card-stamp { 
  opacity: 1;
  transform: rotate(12deg) scale(1.05);
}

.index .board .stamp {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

/* 外层只做容器：去掉边框/背景/内边距/裁剪 */
.index .board .letter {
  position: relative;
  border: none;
  background: transparent;
  border-radius: 0;
  padding: 0;
  min-height: 0;
  overflow: visible;
  height: 100%;
  display: grid;
}

/* 内层作为唯一"信件卡"外观 */
.index .board .letter-pane {
  position: relative;
  display: none;
  background: linear-gradient(180deg, var(--tint), transparent 60%);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px;
  padding: 18px 18px 22px;
  min-height: 240px;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
  overflow: hidden;
  height: 100%;
  padding-bottom: 64px;
}

/* 只要左列有任意卡处于 hover，就先把右侧所有信件隐藏 */
.index .board .board .choices:has(.choice:hover)
  ~ .letter .letter-pane { display: none; }

/* 按角色显示对应信件 */
.index .board .board .choices:has(.choice[data-role="north"]:hover)
  ~ .letter .role-north { display: block; }

.index .board .board .choices:has(.choice[data-role="tooth"]:hover)
  ~ .letter .role-tooth { display: block; }

.index .board .board .choices:has(.choice[data-role="bunny"]:hover)
  ~ .letter .role-bunny { display: block; }

/* 默认：按 data-active 显示对应信件 */
.index .board .letter[data-active="north"] .role-north { display: block; }
.index .board .letter[data-active="tooth"] .role-tooth { display: block; }
.index .board .letter[data-active="bunny"] .role-bunny { display: block; }

/* 招募信内部样式 */
.index .board .letter-head {
  font-family: 'Cinzel Decorative', serif;
  font-weight: 700;
  letter-spacing: .3px;
  font-size: 16px;
  color: #cfe2ff;
  background: #fff2;
  border: 1px solid rgba(43, 58, 99, .2);
  padding: 8px 10px;
  border-radius: 10px;
  display: inline-block;
  margin: 4px 0 10px;
}

/* 让 letter-head 的文字颜色呼应 tint 色 */
.index .board .role-north .letter-head { color: #7BC4FF; }
.index .board .role-tooth .letter-head { color: #C39BFF; }
.index .board .role-bunny .letter-head { color: #65D08A; }

.index .board .letter p {
  margin: 0 0 10px;
  color: rgba(255,255,255,.9);
  line-height: 1.6;
  font-size: 16px;
}

/* Dear：保持斜体 + 稍加间距 */
.index .board .letter p.dear {
  font-style: italic;
  color: rgba(255,255,255,.85);
  margin-bottom: 10px;
}

/* 正文段落：首行缩进（不作用于 Dear/Sign/抬头） */
.index .board .letter-pane > p:not(.dear):not(.sign) {
  text-indent: 1.5em;
}

/* 落款固定在右下角 */
.index .board .letter p.sign {
  position: absolute;
  right: 16px;
  bottom: 16px;
  margin: 0;
  text-align: right;
  font-family: 'Great Vibes', 'Dancing Script', cursive;
  font-size: 18px;
  color: #f8d26a;
}

/* 角色色调（轻微背景晕染） */
.index .board .role-north { --tint: rgba(168,208,255,.10); }
.index .board .role-tooth { --tint: rgba(200,230,255,.10); }
.index .board .role-bunny { --tint: rgba(155, 231, 176, .12); }

.index .board .seal {
  position: absolute;
  right: 10px;
  top: 10px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(255,255,255,.3);
  box-shadow: 0 2px 6px rgba(0,0,0,.4);
}

.index .board .seal img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Responsive */
@media (max-width: 860px) {
  .index .board .board {
    grid-template-columns: 1fr;
  }
  .index .board .board > .choices,
  .index .board .board > .letter {
    grid-column: 1;
  }
}

/* 小屏去掉缩进，边缘更干净 */
@media (max-width: 420px) {
  .index .board .letter-pane > p:not(.dear):not(.sign) {
    text-indent: 0;
  }
}

/* Steps Section */
.index .steps-section {
  padding: 0;
  position: relative;
}

.index .steps-header {
  text-align: center;
  margin-bottom: 20px;
}

.index .steps-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(22px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: .3px;
  color: #fff;
  margin: 0 0 20px;
}

.index .steps-subtitle {
  font-size: 1.2rem;
  color: #e0e0e0;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
  margin: 0 auto 40px;
}

/* 网格：桌面 4 列，平板 2 列，手机 1 列 */
.index .steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 18px;
}

/* 3个步骤的布局 */
.index .steps--three {
  grid-template-columns: repeat(3, 1fr);
}

.index .step-card {
  position: relative;
  height: 100%;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  background: rgba(255,255,255,.04);
  padding: 16px 14px 16px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  display: flex;
  flex-direction: column;
}

/* Subtle hover glow without movement */
.index .step-card:hover {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.2);
  box-shadow: 0 10px 28px rgba(0,0,0,.22);
}

/* 步骤卡片头部 - 包含图标、标题和数字 */
.index .step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

/* 魔法 emoji 圆标 */
.index .step-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 18px;
  flex-shrink: 0;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.25);
}

/* 数字徽章 */
.index .step-badge {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 14px;
  color: #0b1020;
  background: linear-gradient(135deg, #ffe08a, #c7e7ff);
  box-shadow: 0 4px 10px rgba(0,0,0,.25), inset 0 1px 0 rgba(255,255,255,.5);
  flex-shrink: 0;
  margin-left: auto;
}

/* 每步不同轻微色调 */
.index .steps .step:nth-child(1) .step-icon { background: rgba(123,196,255,.15); border-color: rgba(123,196,255,.35); }
.index .steps .step:nth-child(2) .step-icon { background: rgba(195,155,255,.15); border-color: rgba(195,155,255,.35); }
.index .steps .step:nth-child(3) .step-icon { background: rgba(248,210,106,.15); border-color: rgba(248,210,106,.35); }

/* 文案 */
.index .step-title {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin: 0;
  flex: 1;
}

.index .step-desc {
  font-family: 'Inter', sans-serif;
  color: rgba(255,255,255,.75);
  line-height: 1.2;
  font-size: 13px;
  margin: 0;
}

/* Responsive */
@media (max-width: 980px) {
  .index .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .index .steps--three {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .index .steps {
    grid-template-columns: 1fr;
  }
  
  .index .steps--three {
    grid-template-columns: 1fr;
  }
}

/* Features Section */
.index .features {
  padding: 0;
  position: relative;
}

.index .features-header {
  text-align: center;
  margin-bottom: 24px;
}

.index .features-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(22px, 3.6vw, 28px);
  font-weight: 700;
  letter-spacing: .3px;
  color: #fff;
  margin: 0 0 20px;
}

.index .features-subtitle {
  font-size: 1.2rem;
  color: #e0e0e0;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
  margin: 0 auto 40px;
}

/* 三列布局：桌面=3，手机=1（跳过平板2列） */
.index .features ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 18px;
  padding: 0;
}

/* Responsive */
@media (max-width: 560px) {
  .index .features ul {
    grid-template-columns: 1fr;
  }
}

/* 给每张卡顶部添加封条色带 */
.index .feature-card {
  position: relative;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  background: rgba(255,255,255,.04);
  padding: 18px 16px 20px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease, box-shadow .18s ease;
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  overflow: hidden;
}

/* Subtle hover glow without movement */
.index .feature-card:hover {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.2);
  box-shadow: 0 10px 28px rgba(0,0,0,.22);
}

.index .feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, #7BC4FF, #cfe2ff); /* 默认蓝 */
}

.index .features ul .feature:nth-child(2) .feature-card::before {
  background: linear-gradient(90deg, #C39BFF, #ead8ff); /* 第二张紫 */
}

.index .features ul .feature:nth-child(3) .feature-card::before {
  background: linear-gradient(90deg, #65D08A, #c9f0d7); /* 第三张绿 */
}

/* 不再显示图标 */
.index .feature-icon { display: none; }

/* 每条的文字 */
.index .feature-title {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin: 4px 0 6px;
}

.index .feature-desc {
  font-family: 'Inter', sans-serif;
  color: rgba(255,255,255,.75);
  line-height: 1.2;
  font-size: 13px;
  margin: 0;
}

/* CTA Section */
.index .cta-section {
  padding: 0 0 40px;
  position: relative;
  isolation: isolate;
}

/* 轻微光晕背景，呼应全站星空但不喧宾夺主 */
.index .cta-section::before {
  content: "";
  position: absolute;
  inset: -10% -10% 0 -10%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(40% 30% at 20% 20%, rgba(123,196,255,.18), transparent 60%),
    radial-gradient(35% 30% at 80% 10%, rgba(195,155,255,.14), transparent 65%),
    radial-gradient(30% 25% at 50% 85%, rgba(248,210,106,.12), transparent 70%);
  filter: blur(16px) saturate(110%);
  opacity: .9;
}

.index .cta-header { 
  text-align: center; 
  margin-bottom: 22px; 
}

.index .cta-title {
  font-family: 'Cinzel Decorative', serif;
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 700;
  letter-spacing: .4px;
  background: linear-gradient(90deg, #ffffff, #ffe08a 55%, #c7e7ff 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0 0 10px;
}

.index .cta-subtitle {
  font-family: 'Inter', sans-serif;
  color: #e0e0e0;
  font-size: 1.1rem;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
  margin: 0 auto;
}

.index .cta-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-top: 40px;
  flex-wrap: wrap;
}

/* CTA Section 按钮样式 */
.index .cta-actions .btn {
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.index .cta-actions .btn.primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  box-shadow: 
    0 8px 32px rgba(102, 126, 234, 0.4),
    0 4px 16px rgba(102, 126, 234, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transform: translateY(0);
}

.index .cta-actions .btn.primary:hover {
  background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
  box-shadow: 
    0 12px 40px rgba(102, 126, 234, 0.5),
    0 6px 20px rgba(102, 126, 234, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
}

.index .cta-actions .btn.primary:active {
  transform: translateY(0);
  box-shadow: 
    0 4px 16px rgba(102, 126, 234, 0.3),
    0 2px 8px rgba(102, 126, 234, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.index .cta-actions .btn:not(.primary) {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.index .cta-actions .btn:not(.primary):hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

/* 按钮光效动画 */
.index .cta-actions .btn.primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.index .cta-actions .btn.primary:hover::before {
  left: 100%;
}

/* 小一行"安心声明" */
.index .cta-footnote {
  margin-top: 16px;
  text-align: center;
  color: rgba(255,255,255,.7);
  font-size: 13px;
  letter-spacing: .2px;
}

/* 响应式 */
@media (max-width: 560px) {
  .index .cta-actions { 
    flex-direction: column; 
  }
  .index .cta-actions .btn { 
    width: 100%; 
  }
}

/* Footer */
.index .footer {
  border-top: 1px solid rgba(255,255,255,.12);
  background: #0b1020;
  padding: 32px 0 28px;
  color: rgba(255,255,255,.75);
  font-size: 14px;
  margin-top: 0;
}

.index .footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.index .footer-brand {
  display: flex;
  justify-content: center;
}

.index .footer-brand .logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  filter: drop-shadow(0 0 6px rgba(248,210,106,.25));
}

.index .footer-copy {
  font-size: 13px;
  color: rgba(255,255,255,.55);
}

.index .footer-contact {
  font-size: 13px;
  color: rgba(255,255,255,.65);
  margin-top: 4px;
}

.index .footer-contact a {
  color: rgba(248,210,106,.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

.index .footer-contact a:hover {
  color: #f8d26a;
  text-decoration: underline;
}

/* 小屏对齐 */
@media (max-width: 560px) {
  .index .footer-brand .logo { 
    width: 72px; 
    height: 72px; 
  }
}

/* ===== RESPONSIVE DESIGN ===== */

/* 大屏幕 (1200px+) */
@media (min-width: 1200px) {
  .index .container {
    max-width: 1200px;
  }
}

/* 中等屏幕 (900px - 1199px) */
@media (min-width: 900px) and (max-width: 1199px) {
  .index .container {
    max-width: 900px;
  }
}

/* 平板屏幕 (768px - 899px) */
@media (min-width: 768px) and (max-width: 899px) {
  .index .container {
    max-width: 768px;
    padding: 0 20px;
  }
}

/* 小屏幕 (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
  .index .container {
    max-width: 100%;
    padding: 0 20px;
  }
  
  .index .board .board {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .index .board .board > .choices,
  .index .board .board > .letter {
    grid-column: 1;
  }
  
  .index .steps {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .index .steps--three {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .index .features ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .index .container {
    padding: 0 15px;
  }

  .index .header .nav {
    gap: 20px;
  }

  .index .hero h1 {
    font-size: 2.5rem;
  }

  .index .hero .lead {
    font-size: 1.1rem;
  }

  .index .hero .actions {
    flex-direction: column;
    align-items: center;
  }

  .index .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .index .feature-card {
    padding: 1.5rem;
  }
}

/* 手机屏幕 (320px - 479px) */
@media (max-width: 479px) {
  .index .container {
    max-width: 100%;
    padding: 0 15px;
  }
  
  .index .board .board {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  
  .index .board .board > .choices,
  .index .board .board > .letter {
    grid-column: 1;
  }
  
  .index .steps {
    grid-template-columns: 1fr;
  }
  
  .index .steps--three {
    grid-template-columns: 1fr;
  }
  
  .index .features ul {
    grid-template-columns: 1fr;
  }
  
  .index .hero h1 {
    font-size: 2.5rem;
  }
  
  .index .hero .lead {
    font-size: 1.1rem;
  }
  
  .index .header .brand {
    font-size: 16px;
  }

  .index .header .nav {
    gap: 15px;
  }
  
  .index .cta-actions {
    flex-direction: column;
  }
  
  .index .cta-actions .btn {
    width: 100%;
  }
}