/* ============================================================
   HEU KMS Activator 下载站 - 主样式表
   风格：清爽简约 / 浅色为主 / 绿色主色 / 橙色下载强调
   v2：绿色配色 / 适度渐变 / 弱化阴影
   ============================================================ */

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 主色（emerald 绿） */
  --color-primary: #059669;
  --color-primary-hover: #047857;
  --color-primary-soft: #ecfdf5;
  --color-primary-border: #a7f3d0;
  --color-accent: #f59e0b;
  --color-accent-hover: #ea8a06;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #10b981 0%, #047857 100%);
  --gradient-accent: linear-gradient(135deg, #fbbf24 0%, #f59e0b 55%, #ea8a06 100%);
  --gradient-hero: linear-gradient(180deg, #ecfdf5 0%, #f7fef9 45%, #ffffff 100%);
  --gradient-dark: linear-gradient(150deg, #064e3b 0%, #022c22 60%, #01201a 100%);

  /* 文字 */
  --color-text: #10241c;
  --color-text-secondary: #45604f;
  --color-text-tertiary: #8fa89a;

  /* 背景 */
  --color-bg: #ffffff;
  --color-bg-soft: #f6faf7;
  --color-bg-muted: #eef5f0;
  --color-bg-dark: #0a1f16;

  /* 边框 */
  --color-border: #dce9e0;
  --color-border-dark: #bcd4c5;

  /* 状态 */
  --color-success: #059669;
  --color-warning: #d97706;
  --color-danger: #dc2626;

  /* 阴影（弱化） */
  --shadow-sm: 0 1px 2px rgba(6, 78, 59, 0.03);
  --shadow-md: 0 1px 4px rgba(6, 78, 59, 0.04);
  --shadow-lg: 0 2px 8px rgba(6, 78, 59, 0.05);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* 容器 */
  --container: 1200px;

  /* 过渡 */
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-hover);
}

ul {
  list-style: none;
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

/* 下载主按钮：暖橙渐变 */
.btn-primary {
  background-image: var(--gradient-accent);
  color: #ffffff;
}

.btn-primary:hover {
  color: #ffffff;
  filter: brightness(0.96);
  transform: translateY(-1px);
}

/* 次按钮：绿色渐变 */
.btn-secondary {
  background-image: var(--gradient-primary);
  color: #ffffff;
}

.btn-secondary:hover {
  color: #ffffff;
  filter: brightness(0.96);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-dark);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 深色区内的描边按钮 */
.section-dark .btn-outline {
  background-color: transparent;
  color: #d1fae5;
  border-color: #2b6b52;
}

.section-dark .btn-outline:hover {
  border-color: #34d399;
  color: #6ee7b7;
}

.btn-icon {
  width: 18px;
  height: 18px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.brand-logo {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: var(--gradient-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.nav-cta {
  margin-left: 12px;
  padding: 10px 18px;
  font-size: 14px;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 80px 0 64px;
  background-image: var(--gradient-hero);
  overflow: hidden;
}

/* 顶部细渐变饰线 */
.hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-image: linear-gradient(90deg, #10b981 0%, #34d399 35%, #fbbf24 100%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 540px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary-hover);
  background-color: var(--color-primary-soft);
  border: 1px solid var(--color-primary-border);
  border-radius: 100px;
  margin-bottom: 20px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-title .highlight {
  color: var(--color-primary);
}

.hero-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  line-height: 1.6;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.hero-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.hero-meta-item strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-actions .btn {
  padding: 14px 24px;
}

.hero-trust {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.hero-trust-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-trust-item svg {
  width: 14px;
  height: 14px;
  stroke: var(--color-success);
}

/* Hero 截图 */
.hero-preview {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.hero-preview img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-preview-caption {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
}

.hero-preview-dot {
  width: 10px;
  height: 10px;
  background-color: var(--color-success);
  border-radius: 50%;
}

/* ---------- 数据条 ---------- */
.stat-bar {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-top: 4px;
}

/* ---------- Section 通用 ---------- */
.section {
  padding: 80px 0;
}

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

.section-dark {
  background-image: var(--gradient-dark);
  color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section-dark .section-title {
  color: #ffffff;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.section-dark .section-desc {
  color: #a7c3b5;
}

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--color-primary);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.feature-icon img {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- 支持系统 ---------- */
.system-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.system-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.system-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
  background-color: var(--color-bg-muted);
  border-bottom: 1px solid var(--color-border);
}

.system-card-header img {
  width: 28px;
  height: 28px;
}

.system-card-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
}

.system-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.system-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.system-list li:nth-child(odd) {
  border-right: 1px solid var(--color-border);
}

.system-list li:nth-last-child(-n+2) {
  border-bottom: none;
}

.system-list li:nth-last-child(2):nth-child(odd) {
  border-bottom: none;
}

.system-list .check {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  stroke: var(--color-success);
}

/* ---------- 截图展示 ---------- */
.screenshot-block {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.screenshot-main {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.screenshot-main img {
  width: 100%;
  height: auto;
}

.screenshot-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.screenshot-feature {
  padding: 20px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  gap: 14px;
}

.screenshot-feature-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-sm);
}

.screenshot-feature-icon img {
  width: 22px;
  height: 22px;
}

.screenshot-feature h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.screenshot-feature p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ---------- 参数 ---------- */
.param-table {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.param-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
}

.param-row:last-child {
  border-bottom: none;
}

.param-row:nth-child(odd) {
  background-color: var(--color-bg-soft);
}

.param-name {
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-hover);
  background-color: var(--color-primary-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  text-align: center;
  display: inline-block;
  width: fit-content;
}

.param-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.param-example {
  margin-top: 16px;
  padding: 16px 20px;
  background-color: var(--color-bg-dark);
  color: #d1fae5;
  border-radius: var(--radius-md);
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  font-size: 14px;
}

.param-example .label {
  display: block;
  color: #6b917d;
  font-size: 12px;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---------- 下载卡片 ---------- */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.download-card {
  padding: 28px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.download-card:hover {
  border-color: var(--color-primary);
}

.download-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.download-icon-quark {
  background-image: linear-gradient(135deg, #10b981 0%, #047857 100%);
}

.download-icon-baidu {
  background-image: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
}

.download-icon-xunlei {
  background-image: linear-gradient(135deg, #fbbf24 0%, #ea8a06 100%);
}

.download-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.download-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  flex-grow: 1;
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.download-meta code {
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  background-color: var(--color-bg-muted);
  padding: 2px 8px;
  border-radius: 4px;
  color: var(--color-text-secondary);
}

.download-card .btn {
  width: 100%;
}

/* ---------- 使用教程 ---------- */
.step-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 28px 24px 24px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  counter-increment: step;
}

.step-number {
  position: absolute;
  top: -14px;
  left: 24px;
  width: 32px;
  height: 32px;
  background-image: var(--gradient-primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
}

.step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  margin-top: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  background-color: var(--color-bg-muted);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
  background-color: var(--color-primary);
  color: #ffffff;
}

.faq-item p {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 注意事项 ---------- */
.notice-block {
  background-color: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  padding: 28px;
}

.notice-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

/* 修复：图标以 img 引用，需约束尺寸，防止 SVG 撑满屏幕 */
.notice-header img {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.notice-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.notice-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.notice-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.notice-list li::before {
  content: "•";
  position: absolute;
  left: 8px;
  top: 0;
  color: var(--color-warning);
  font-size: 18px;
  line-height: 1.4;
}

.notice-list strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ---------- 信任标识 ---------- */
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.trust-item {
  text-align: center;
  padding: 24px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.trust-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: var(--color-primary-soft);
  border-radius: 50%;
  margin-bottom: 12px;
}

.trust-icon img {
  width: 24px;
  height: 24px;
}

.trust-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

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

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-bg-dark);
  color: #a7c3b5;
  padding: 48px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-about {
  font-size: 13px;
  color: #6b917d;
  line-height: 1.6;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.footer-list li {
  margin-bottom: 10px;
}

.footer-list a {
  color: #6b917d;
  font-size: 13px;
}

.footer-list a:hover {
  color: #6ee7b7;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #16382a;
  font-size: 12px;
  color: #4f7a63;
  text-align: center;
  line-height: 1.8;
}

.footer-bottom a {
  color: #6b917d;
}

.footer-bottom a:hover {
  color: #6ee7b7;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 36px;
  }
  .feature-grid,
  .download-grid {
    grid-template-columns: 1fr 1fr;
  }
  .system-grid {
    grid-template-columns: 1fr;
  }
  .step-list {
    grid-template-columns: 1fr 1fr;
  }
  .screenshot-block {
    grid-template-columns: 1fr;
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .trust-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 56px 0;
  }
  .section-title {
    font-size: 28px;
  }
  .hero {
    padding: 56px 0 48px;
  }
  .hero-title {
    font-size: 30px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .feature-grid,
  .download-grid,
  .step-list,
  .trust-grid {
    grid-template-columns: 1fr;
  }
  .system-list {
    grid-template-columns: 1fr;
  }
  .system-list li:nth-child(odd) {
    border-right: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none;
  }
  .param-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}