/* 科技风格：深色 + 红/青强调 + 网格 */
:root {
  --bg: #06080c;
  --bg-card: rgba(12, 16, 24, 0.85);
  --card-border: rgba(255, 255, 255, 0.06);
  --accent: #e85c3a;
  --accent-glow: rgba(232, 92, 58, 0.35);
  --tech-cyan: #00d4ff;
  --tech-cyan-dim: rgba(0, 212, 255, 0.15);
  --text: #e8ecf0;
  --text-muted: #7a8a9a;
  --radius: 16px;
  --header-height: 64px;
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* ========== 科技感背景：网格线 ========== */
.bg-tech {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, transparent 0%, rgba(0, 212, 255, 0.03) 50%, transparent 100%),
    linear-gradient(90deg, var(--tech-cyan-dim) 1px, transparent 1px),
    linear-gradient(0deg, var(--tech-cyan-dim) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0, -1px -1px, -1px -1px;
  pointer-events: none;
}

/* ========== 顶部 Logo（GM） ========== */
.header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-height);
  padding: 0 24px;
  display: flex;
  align-items: center;
  background: rgba(6, 8, 12, 0.9);
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(12px);
}

.logo-wrap {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}

.logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 12px;
}

/* 无图片时：红渐变 GM 图标（与 GM logo 一致） */
.logo-fallback {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, #f06d4a 0%, #c0392b 100%);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-display);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: -0.05em;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

/* ========== 主内容 ========== */
.main {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.hero {
  text-align: center;
  margin-bottom: 52px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--tech-cyan);
  border: 1px solid var(--tech-cyan-dim);
  border-radius: 4px;
}

.title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.title-accent {
  color: var(--accent);
  text-shadow: 0 0 24px var(--accent-glow);
}

.desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ========== 下载卡片（科技玻璃 + 边框光） ========== */
.downloads {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
}

.download-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}

.download-card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: 0 0 32px var(--tech-cyan-dim), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transform: translateY(-3px);
}

.card-glow {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  height: 80%;
  background: radial-gradient(ellipse, var(--tech-cyan-dim) 0%, transparent 70%);
  pointer-events: none;
}

.card-icon {
  position: relative;
  font-size: 2.75rem;
  margin-bottom: 14px;
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.2));
}

.download-card h2 {
  position: relative;
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.download-card p {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* 按钮：科技感描边 + 红主色 */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.25s;
  cursor: pointer;
  font-family: var(--font-body);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid transparent;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  background: #f06d4a;
  box-shadow: 0 0 28px var(--accent-glow);
  transform: scale(1.02);
}

/* ========== 底部说明与页脚 ========== */
.footer-note {
  margin-top: 52px;
  text-align: center;
}

.footer-note p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer {
  position: relative;
  z-index: 1;
  padding: 24px;
  text-align: center;
  border-top: 1px solid var(--card-border);
}

.footer p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ========== PC：多列 ========== */
@media (min-width: 600px) {
  .downloads {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .downloads {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .download-card {
    padding: 36px 28px;
  }

  .logo-img,
  .logo-fallback {
    width: 46px;
    height: 46px;
  }

  .logo-text {
    font-size: 1.5rem;
  }
}

/* ========== 手机端 ========== */
@media (max-width: 599px) {
  .header {
    padding: 0 16px;
  }

  .main {
    padding: 40px 16px 64px;
  }

  .hero {
    margin-bottom: 40px;
  }

  .hero-badge {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
  }

  .download-card {
    padding: 28px 20px;
  }
}