/* ============================================================
   styles.css — 智能闹钟 · 蓝牙助手
   ============================================================ */

/* ----- 全局重置 & 主题 ----- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(145deg, #f8faff 0%, #eef3fc 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.2rem;
  color: #0e1d34;
}

/* ----- 语言切换下拉框 ----- */
.lang-dropdown {
  position: relative;
  flex-shrink: 0;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid #d6e2f5;
  border-radius: 6px;
  padding: 0.45rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: #1f4e9e;
  cursor: pointer;
  transition: 0.15s ease;
  font-family: inherit;
  outline: none;
}

.lang-btn:hover {
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 4px 12px rgba(26, 62, 124, 0.1);
}

.lang-flag {
  border-radius: 2px;
  flex-shrink: 0;
}

.lang-arrow {
  font-size: 0.65rem;
  margin-left: 0.15rem;
  transition: 0.15s ease;
}

.lang-dropdown.open .lang-arrow {
  transform: rotate(180deg);
}

.lang-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 100%;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid #d6e2f5;
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 20, 50, 0.1);
  z-index: 50;
  overflow: hidden;
}

.lang-dropdown.open .lang-menu {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font-size: 0.85rem;
  color: #1f4e9e;
  transition: 0.1s ease;
  white-space: nowrap;
}

.lang-option:hover {
  background: #eef3fc;
}

.lang-option.active {
  background: #dce6f5;
  font-weight: 600;
}

.lang-option .lang-flag {
  flex-shrink: 0;
}

/* ----- 主卡片容器 ----- */
.app-card {
  max-width: 1100px;
  width: 100%;
  background: rgba(255, 255, 255, 0.70);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 56px;
  padding: 2.5rem 2.5rem 2rem;
  box-shadow: 0 30px 70px rgba(0, 20, 50, 0.12), 0 8px 24px rgba(0, 20, 50, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: all 0.2s;
}

/* ----- 头部区域 ----- */
.app-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem 1.2rem;
  margin-bottom: 2.8rem;
}

.app-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #1f4e9e, #2a6df4);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2.6rem;
  box-shadow: 0 12px 24px -8px rgba(26, 62, 124, 0.3);
  flex-shrink: 0;
}

.app-title-group {
  flex: 1;
}

.app-title-group h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #0b1a33;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.2rem 0.8rem;
}

.app-title-group h1 small {
  font-size: 1rem;
  font-weight: 500;
  background: #dce6f5;
  padding: 0.15rem 1rem;
  border-radius: 40px;
  color: #1a3e7c;
  letter-spacing: 0.02em;
}

.app-subtitle {
  display: block;
  width: 100%;
  font-size: 1.1rem;
  font-weight: 400;
  color: #3b5580;
  letter-spacing: 0.01em;
  margin-top: 0.15rem;
}

.app-title-group .subhead {
  font-size: 1rem;
  color: #3b5580;
  margin-top: 0.2rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.app-title-group .subhead i {
  color: #2a6df4;
  font-size: 0.9rem;
}

/* ----- 功能网格 ----- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1.8rem;
  margin: 2.2rem 0 2.8rem;
}

.feature-item {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 1.5rem 1.2rem;
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 0 4px 16px rgba(0, 10, 30, 0.02);
  transition: 0.15s ease;
  display: flex;
  flex-direction: column;
}

.feature-item:hover {
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 12px 28px -8px rgba(26, 62, 124, 0.08);
}

.feature-item .icon {
  font-size: 2.2rem;
  color: #1f4e9e;
  margin-bottom: 0.5rem;
}

.feature-item h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: #0a1a30;
}

.feature-item p {
  font-size: 0.9rem;
  line-height: 1.4;
  color: #3a5580;
}

/* ----- 预览区域 ----- */
.preview-section {
  background: rgba(240, 247, 255, 0.5);
  border-radius: 40px;
  padding: 1.8rem 1.8rem 1.2rem;
  margin: 1.5rem 0 2.5rem;
  border: 1px solid rgba(255, 255, 255, 0.6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.2rem;
}

.preview-text {
  flex: 1 1 200px;
}

.preview-text h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #0f2440;
  margin-bottom: 0.3rem;
}

.preview-text p {
  color: #3d5a82;
  font-size: 0.9rem;
}

.preview-thumbnails {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.thumb {
  width: 70px;
  height: 70px;
  background: linear-gradient(145deg, #c1d4f0, #e3edfe);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1f4e9e;
  font-size: 1.8rem;
  border: 1px solid white;
  box-shadow: 0 4px 12px rgba(0,0,0,0.02);
}

.thumb i {
  opacity: 0.8;
}

/* ----- 底部下载区域 ----- */
.download-section {
  margin-top: 2.2rem;
  padding-top: 1.8rem;
  border-top: 2px dashed rgba(42, 109, 244, 0.15);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.download-title {
  font-weight: 500;
  color: #1d3457;
  letter-spacing: 0.02em;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.download-title i {
  color: #2a6df4;
}

.download-buttons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.8rem;
}

/* 下载按钮通用样式 */
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 0.75rem 1.8rem 0.75rem 1.6rem;
  border-radius: 6px;
  background: white;
  border: 1px solid #d6e2f5;
  box-shadow: 0 4px 12px rgba(0, 20, 50, 0.02);
  font-weight: 500;
  font-size: 0.95rem;
  color: #0b1a33;
  text-decoration: none;
  transition: 0.15s ease;
}

.download-btn:not(.disabled) {
  cursor: pointer;
}

.download-btn i {
  font-size: 1.4rem;
  color: #1a3e7c;
}

.download-btn .btn-label {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.download-btn .btn-label small {
  font-weight: 400;
  font-size: 0.6rem;
  letter-spacing: 0.03em;
  opacity: 0.7;
  text-transform: uppercase;
}

.download-btn .btn-label span {
  font-weight: 600;
  font-size: 0.95rem;
}

/* 主要品牌按钮 */
.download-btn.primary {
  background: #0b1a33;
  border-color: #0b1a33;
  color: white;
  box-shadow: 0 8px 20px -6px rgba(26, 62, 124, 0.25);
}

.download-btn.primary i {
  color: #b6d0ff;
}

.download-btn.primary .btn-label small {
  color: #a0bce6;
}

.download-btn.primary .btn-label span {
  color: white;
}

/* 次要按钮 */
.download-btn.secondary {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(4px);
}

.download-btn.secondary i {
  color: #2a4b7a;
}

/* 禁用按钮 */
.download-btn.disabled {
  cursor: default;
}

/* 按下效果 */
.download-btn:active {
  transform: scale(0.97);
}

/* ----- 版本信息（header 下方） ----- */
.app-meta {
  width: 100%;
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.app-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(240, 245, 255, 0.7);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.72rem;
  color: #3a5580;
}

.app-meta-item i {
  font-size: 0.7rem;
  color: #1f4e9e;
}

/* 底部小字 */
.bottom-note {
  margin-top: 1.2rem;
  font-size: 0.65rem;
  color: #8ba0c0;
  text-align: center;
  border-top: 1px solid #eaf0fa;
  padding-top: 1.2rem;
  letter-spacing: 0.02em;
}

/* ----- 下载页标语 ----- */
.tagline {
  text-align: center;
  font-size: 1.15rem;
  color: #3b5580;
  line-height: 1.6;
  margin: 0.5rem 0 1rem;
  font-weight: 400;
}

/* ============================================================
   响应式
   ============================================================ */
.download-page-card {
   min-height: 100vh;
   display: flex;
   flex-direction: column;
   justify-content: center;
 }

@media (max-width: 700px) {
  body { padding: 0.8rem; }
  .app-card { padding: 1.5rem 1rem; border-radius: 32px; }
  .app-title-group h1 { font-size: 1.5rem; }
  .app-title-group .subhead { font-size: 0.85rem; }
  .app-icon { width: 56px; height: 56px; font-size: 1.8rem; border-radius: 18px; }
  .features-grid { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
  .feature-item { padding: 1rem 0.9rem; border-radius: 24px; }
  .feature-item .icon { font-size: 1.6rem; }
  .feature-item h3 { font-size: 1rem; }
  .feature-item p { font-size: 0.8rem; }
  .download-section { margin-top: 1rem; padding-top: 1.2rem; }
  .download-title { font-size: 0.85rem; }
  .download-buttons { flex-direction: column; align-items: stretch; }
  .download-btn { justify-content: center; padding: 0.65rem 1.2rem; font-size: 0.85rem; }
  .download-btn i { font-size: 1.2rem; }
  .preview-section { padding: 1.2rem 1rem; border-radius: 28px; }
  .preview-text h4 { font-size: 0.95rem; }
  .preview-text p { font-size: 0.8rem; }
  .thumb { width: 52px; height: 52px; font-size: 1.4rem; border-radius: 14px; }
  .app-meta-item { font-size: 0.65rem; padding: 0.2rem 0.6rem; }
  .bottom-note { font-size: 0.6rem; padding-top: 0.8rem; margin-top: 0.8rem; }
  .tagline { font-size: 1rem; }
}

@media (max-width: 480px) {
  body { padding: 0.4rem; }
  .app-card { padding: 1.2rem 0.8rem; border-radius: 24px; }
  .app-header { flex-direction: column; align-items: flex-start; gap: 0.8rem; margin-bottom: 1.5rem; }
  .app-title-group h1 { font-size: 1.25rem; }
  .app-title-group h1 small { font-size: 0.75rem; padding: 0.1rem 0.6rem; }
  .app-title-group .subhead { font-size: 0.75rem; flex-direction: column; align-items: flex-start; gap: 0.3rem; }
  .features-grid { grid-template-columns: 1fr; gap: 0.7rem; }
  .feature-item { padding: 0.9rem 0.8rem; border-radius: 20px; }
  .download-section { margin-top: 0.6rem; padding-top: 1rem; gap: 0.8rem; }
  .download-title { font-size: 0.8rem; }
  .download-btn { padding: 0.6rem 1rem; font-size: 0.8rem; }
  .download-btn .btn-label span { font-size: 0.85rem; }
  .preview-section { flex-direction: column; align-items: flex-start; padding: 1rem 0.8rem; border-radius: 24px; margin: 1rem 0 1.5rem; }
  .preview-thumbnails { justify-content: center; width: 100%; }
  .app-meta { gap: 0.3rem; }
  .lang-btn { padding: 0.35rem 0.6rem; font-size: 0.75rem; }
  .lang-menu { right: auto; left: 0; }
  .tagline { font-size: 0.9rem; }
  .download-page-card .app-header { flex-direction: row; align-items: center; }
}