:root {
  --bg-primary: #0a0b10;
  --bg-surface: #13151f;
  --bg-surface-elevated: #1a1d2b;
  --bg-card: rgba(23, 26, 38, 0.72);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.16);
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #7f00ff;
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-sans: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
}

/* 预留背景图层与质感光晕 */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.bg-image {
  position: absolute;
  inset: 0;
  background-image: url('img/bg.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  opacity: 0.38;
  filter: saturate(1.15) brightness(0.9);
  transition: opacity 0.5s ease;
}

.bg-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 15%, rgba(79, 172, 254, 0.15), transparent 55%),
              radial-gradient(circle at 85% 60%, rgba(127, 0, 255, 0.12), transparent 50%),
              linear-gradient(180deg, rgba(10, 11, 16, 0.6) 0%, rgba(10, 11, 16, 0.95) 75%, #0a0b10 100%);
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at 50% 40%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, black 30%, transparent 80%);
}

/* 主容器 */
.app-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 24px 20px 48px;
  display: flex;
  flex-direction: column;
}

/* 顶部导航 */
.header-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.status-dot {
  width: 7px;
  height: 7px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.brand-status-text {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #cbd5e1;
}

.device-indicator {
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 5px 12px;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
}

/* 核心 Hero 区域 */
.hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 32px;
}

.app-logo-wrap {
  position: relative;
  width: 88px;
  height: 88px;
  margin-bottom: 18px;
}

.app-logo-wrap::before {
  content: '';
  position: absolute;
  inset: -4px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 24px;
  filter: blur(14px);
  opacity: 0.55;
  z-index: -1;
  animation: logoGlow 4s infinite alternate ease-in-out;
}

@keyframes logoGlow {
  0% { opacity: 0.4; filter: blur(12px); }
  100% { opacity: 0.7; filter: blur(18px); }
}

.app-logo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  background: #141724;
}

.app-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  background: linear-gradient(180deg, #ffffff 10%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.app-tagline {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 380px;
  line-height: 1.6;
}

.feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 14px;
}

.pill {
  font-size: 11px;
  font-weight: 500;
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 4px 10px;
  border-radius: 999px;
}

/* 下载版本堆叠区域 (上下布局) */
.download-sections {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

/* 单个下载卡片通用 */
.download-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 22px 20px;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.download-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

.download-card.highlight {
  border-color: rgba(79, 172, 254, 0.4);
  background: linear-gradient(180deg, rgba(26, 32, 53, 0.8) 0%, rgba(18, 21, 34, 0.8) 100%);
}

.card-ribbon {
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.card-ribbon.android-ribbon {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.card-ribbon.ios-ribbon {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.os-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.os-icon-wrap.android {
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.2);
}

.os-icon-wrap.ios {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.2);
}

.os-icon-wrap svg {
  width: 24px;
  height: 24px;
}

.os-details {
  display: flex;
  flex-direction: column;
}

.os-title {
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.os-sub {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.version-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 11px;
  color: var(--text-muted);
}

.version-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.version-meta span strong {
  color: #cbd5e1;
  font-weight: 600;
}

/* 下载主按钮 */
.btn-download {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  outline: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-android {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

.btn-android:hover {
  box-shadow: 0 10px 28px rgba(16, 185, 129, 0.45);
  transform: translateY(-1px);
}

.btn-android:active {
  transform: translateY(1px) scale(0.99);
}

.btn-ios {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.28);
}

.btn-ios:hover {
  box-shadow: 0 10px 28px rgba(56, 189, 248, 0.4);
  transform: translateY(-1px);
}

.btn-ios:active {
  transform: translateY(1px) scale(0.99);
}

.btn-download svg {
  width: 19px;
  height: 19px;
  flex-shrink: 0;
}

/* iOS 专属提示说明条 */
.ios-tf-tip {
  margin-top: 12px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.06);
  border: 1px dashed rgba(56, 189, 248, 0.25);
  font-size: 12px;
  color: #93c5fd;
  line-height: 1.5;
}

.ios-tf-tip svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  color: #38bdf8;
}

.ios-tf-tip .highlight-tag {
  color: #ffffff;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

/* 底部说明与支持 */
.footer-info {
  margin-top: auto;
  text-align: center;
  padding-top: 20px;
}

.safe-guarantee {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 12px;
  margin-bottom: 14px;
}

.safe-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.safe-item svg {
  width: 14px;
  height: 14px;
  color: #10b981;
}

.copyright {
  font-size: 11px;
  color: #475569;
}

/* ================= 引导弹窗 Modal ================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(5, 7, 12, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  padding: 0;
}

@media (min-width: 640px) {
  .modal-overlay {
    align-items: center;
    padding: 20px;
  }
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-sheet {
  width: 100%;
  max-width: 480px;
  background: #151722;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 28px 28px 0 0;
  padding: 26px 22px 34px;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.6);
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

@media (min-width: 640px) {
  .modal-sheet {
    border-radius: 24px;
    transform: translateY(20px) scale(0.96);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.7);
  }
}

.modal-overlay.active .modal-sheet {
  transform: translateY(0) scale(1);
}

.modal-handle {
  width: 36px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
  margin: 0 auto 16px;
}

@media (min-width: 640px) {
  .modal-handle {
    display: none;
  }
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title-group h3 {
  font-size: 19px;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-title-group p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.btn-close-modal {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-close-modal:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.15);
}

/* 步骤条目 */
.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.step-card {
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 16px;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.step-number {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #0b0f19;
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-title {
  font-size: 14px;
  font-weight: 600;
  color: #f1f5f9;
}

.step-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

/* 步骤内的快捷行动区 */
.step-action-row {
  display: flex;
  gap: 8px;
}

.btn-step-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-step-action.primary {
  background: #38bdf8;
  color: #04101e;
}

.btn-step-action.primary:hover {
  background: #7dd3fc;
}

.btn-step-action.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-step-action.secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

/* 搜索复制卡片 */
.search-copy-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.search-name {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: #38bdf8;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy:hover {
  background: rgba(56, 189, 248, 0.25);
}

.btn-copy.copied {
  background: rgba(16, 185, 129, 0.2);
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

/* 弹窗底部主CTA */
.modal-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-tf-direct {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.25);
  transition: var(--transition);
}

.btn-tf-direct:hover {
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.35);
  transform: translateY(-1px);
}

.btn-tf-dismiss {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 13px;
  padding: 8px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-tf-dismiss:hover {
  color: var(--text-secondary);
}

/* Toast 提示 */
.toast-notice {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.5);
  z-index: 10000;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.3s ease;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast-icon {
  width: 16px;
  height: 16px;
  color: #10b981;
}