* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-start: #0f0f1a;
  --bg-end: #1a1a2e;
  --card-bg: rgba(255, 255, 255, 0.06);
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --text: #eee;
  --text-muted: #aaa;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, var(--bg-start) 0%, var(--bg-end) 100%);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.page {
  max-width: 440px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  text-align: center;
  padding: 2rem 0 1rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
}

.slogan {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.main {
  flex: 1;
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.card-content {
  text-align: center;
}

.desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.download-area {
  margin: 1.5rem 0;
}

.btn-download {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 14px 36px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s;
  border: none;
  cursor: pointer;
}

.btn-download:hover {
  background: var(--accent-hover);
}

.btn-download.disabled {
  background: #555;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-share {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 10px 24px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 10px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.btn-share:hover {
  background: var(--accent);
  color: #fff;
}

.version {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.invite-box {
  margin-top: 1.5rem;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 12px;
  display: none;
}

.invite-box.show {
  display: block;
}

.invite-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.invite-code {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 3px;
  user-select: all;
  margin: 0.25rem 0;
}

.btn-copy-invite {
  display: inline-block;
  margin: 0.5rem 0;
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-copy-invite:hover {
  background: var(--accent-hover);
}

.invite-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tips {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer {
  text-align: center;
  padding: 2rem 0 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}