/*
  Chrome 安全下载站 - 组件样式表
  按钮、卡片、导航栏、折叠面板、标签切换、步骤编号、徽章
*/

/* ─── 按钮组件 ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--btn-radius);
  transition: all var(--transition-normal);
  white-space: nowrap;
  min-height: 48px;
}

.btn-primary {
  background: var(--btn-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 24px rgba(5, 150, 105, 0.4);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: #ffffff;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
  background: var(--bg-secondary);
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.15);
  transform: translateY(-2px);
}

.btn-large {
  padding: 18px 36px;
  font-size: 1.1rem;
  min-height: 56px;
}

/* ─── 卡片组件 ─── */
.card {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  border: var(--border-card);
  box-shadow: var(--card-shadow);
  padding: 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-5px);
  border: var(--border-card-hover);
  box-shadow: var(--card-shadow-hover);
}
.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--bg-secondary);
  margin-bottom: 20px;
  transition: transform var(--transition-normal);
}
.card:hover .card-icon {
  transform: scale(1.1);
}
.card-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--color-primary);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ─── 网格布局 ─── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 992px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ─── 导航栏 ─── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: transparent;
  z-index: 1000;
  transition: all var(--transition-normal);
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px rgba(5, 150, 105, 0.1);
  border-bottom: 1px solid rgba(52, 211, 153, 0.2);
}
.navbar-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
}
.nav-brand svg {
  width: 32px;
  height: 32px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-item {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all var(--transition-fast);
  position: relative;
}
.nav-item:hover {
  color: var(--color-primary);
  background: var(--bg-secondary);
}
.nav-item.active {
  color: var(--color-primary);
  font-weight: 600;
}
.nav-item.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 16px;
  right: 16px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端导航面板 */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    border-left: 4px solid transparent;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    border-left: 4px solid var(--color-accent);
  }
  .nav-item {
    width: 100%;
    padding: 14px 16px;
    border-radius: 8px;
  }
  .nav-item.active {
    background: var(--bg-secondary);
    border-left: 3px solid var(--color-primary);
  }
  .nav-item.active::after {
    display: none;
  }
}

/* ─── 折叠面板（FAQ） ─── */
.accordion-item {
  background: var(--card-bg);
  border-radius: 12px;
  border: var(--border-card);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}
.accordion-item:hover {
  border-color: var(--color-accent);
}
.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  user-select: none;
  border-left: 4px solid var(--color-accent);
}
.accordion-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}
.accordion-icon svg {
  width: 18px;
  height: 18px;
}
.accordion-item.open .accordion-icon {
  transform: rotate(45deg);
}
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}
.accordion-item.open .accordion-body {
  max-height: 500px;
  padding: 0 24px 20px;
}
.accordion-body p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ─── 标签切换 ─── */
.tab-bar {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: all var(--transition-fast);
  border-bottom: 3px solid transparent;
  cursor: pointer;
}
.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.6);
}
.tab-btn.active {
  color: var(--color-primary);
  font-weight: 600;
  background: #ffffff;
  border-bottom: 3px solid var(--color-primary);
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.1);
}
.tab-panel {
  display: none;
  animation: fadeInUp 0.4s ease-out;
}
.tab-panel.active {
  display: block;
}

/* ─── 步骤编号 ─── */
.step-number {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.1rem;
  border-radius: 50%;
  flex-shrink: 0;
  transition: transform var(--transition-slow);
}
.step-card:hover .step-number {
  transform: rotate(360deg);
}

/* ─── 徽章 ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
}
.badge-green {
  background: var(--bg-secondary);
  color: var(--color-primary);
  border: 1px solid var(--color-accent);
}
.badge-recommended {
  background: linear-gradient(135deg, var(--color-accent), #6ee7b7);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(52, 211, 153, 0.3);
}

/* ─── 版本对比卡片 ─── */
.version-card {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  border: var(--border-card);
  padding: 32px;
  text-align: center;
  position: relative;
  transition: all var(--transition-normal);
}
.version-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-accent);
}
.version-card .badge-recommended {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
}
.version-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 12px 0 8px;
}
.version-freq {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.version-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}
.version-features {
  text-align: left;
  margin-bottom: 20px;
}
.version-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.version-features li svg {
  width: 18px;
  height: 18px;
  stroke: var(--color-primary);
  flex-shrink: 0;
}

/* ─── 提示框 ─── */
.tip-box {
  background: var(--bg-secondary);
  border: 1px solid var(--color-accent);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 16px 0;
}
.tip-box-warning {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 12px;
  padding: 20px 24px;
  margin: 16px 0;
}
.tip-box-title {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── 页脚 ─── */
.footer {
  background: #ffffff;
  border-top: 1px solid #d1fae5;
  padding: 48px 0 24px;
}
.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
}
.footer-links a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  transition: all var(--transition-fast);
}
.footer-links a:hover {
  color: var(--color-primary);
  background: var(--bg-secondary);
}
.footer-divider {
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: 0 auto 20px;
}
.footer-info {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.footer-info p {
  margin-bottom: 4px;
}

/* ─── 信任背书信息板 ─── */
.trust-panel {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  border: var(--border-card);
  padding: 32px;
  position: relative;
  overflow: hidden;
}
.trust-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--color-accent);
  border-radius: 2px 0 0 2px;
}
.trust-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 12px;
  margin-bottom: 16px;
  color: var(--color-primary);
}
.trust-icon svg {
  width: 24px;
  height: 24px;
}
.trust-icon:hover {
  animation: pulseGlow 2s ease-in-out infinite;
}

/* ─── 平台小卡片 ─── */
.platform-card {
  background: var(--card-bg);
  border-radius: 16px;
  border: var(--border-card);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
}
.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
  border-color: var(--color-accent);
}
.platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  color: var(--color-primary);
}
.platform-icon svg {
  width: 100%;
  height: 100%;
}
.platform-name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 4px;
}
.platform-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ─── 文章卡片 ─── */
.article-card {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  border: var(--border-card);
  padding: 28px;
  transition: all var(--transition-normal);
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}
.article-tag {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-secondary);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 6px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.article-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
}