/* ── 全局变量 & Reset ───────────────────────────────────── */
:root {
  --bg:        #0a0a0a;
  --surface:   #111111;
  --surface2:  #1a1a1a;
  --border:    #2a2a2a;
  --text:      #f0f0f0;
  --text-dim:  #888;
  --accent:    #f5c842;
  --radius:    12px;
  --radius-sm: 8px;
}

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

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── 导航 ───────────────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--accent);
}

.btn-nav-cta {
  padding: 8px 18px;
  background: var(--accent);
  color: #000;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: opacity 0.15s;
}
.btn-nav-cta:hover { opacity: 0.85; }

.nav-user { display: flex; align-items: center; gap: 10px; margin-left: 12px; }

.btn-nav-signin {
  padding: 7px 16px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.15s;
}
.btn-nav-signin:hover { border-color: var(--accent); color: var(--accent); }

/* ── 按钮 ───────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  padding: 14px 28px;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: 15px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s;
}
.btn-primary:hover:not(:disabled) { opacity: 0.88; }
.btn-primary:disabled { opacity: 0.35; cursor: not-allowed; }

/* ── Footer ──────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 40px;
  color: var(--text-dim);
  font-size: 13px;
  border-top: 1px solid var(--border);
}

/* ── Loading dots ────────────────────────────────────────── */
.loading-dots::after {
  content: '...';
  animation: blink 1.2s steps(3, end) infinite;
}
@keyframes blink {
  0%, 100% { content: '.'; }
  33%       { content: '..'; }
  66%       { content: '...'; }
}

.hidden { display: none !important; }