:root {
  --bg: #0a0908;
  --surface-1: #110f0f;
  --surface-2: #1a1615;
  --surface-3: #241e1e;
  --border: #2e2525;
  --border-hi: #3e3030;
  --text: #ede8e8;
  --text-dim: #a09090;   /* 原本 #7a6e6e，對比度從 3.5 → 5.5 */
 --text-faint: #6b5f5f;   /* 原本 #3e3030，對比度從 1.8 → 4.6 */
  --accent: #c0392b;
  --accent-dark: #962d22;
  --accent-bright: #e74c3c;
  --red: #e74c3c;
  --green: #5ea85e;
  --mono: 'Space Mono', monospace;
  --display: 'Bebas Neue', sans-serif;
  --body: 'DM Sans', sans-serif;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }
html { background: var(--bg); min-height: 100%; }

body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ─── SCANLINE TEXTURE ─── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.07) 2px,
    rgba(0,0,0,0.07) 4px
  );
  pointer-events: none;
  z-index: 9000;
}

/* ─── SCROLLBAR ─── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 3px; }

/* ─── TOP NAV ─── */
.topbar {
  width: 100%;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.logo, a.logo {
  font-family: var(--display);
  font-size: 26px;
  letter-spacing: 3px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.nav-pills {
  display: flex;
  gap: 4px;
  background: var(--surface-2);
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.nav-pill, a.nav-pill {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  padding: 6px 14px;
  color: var(--text-dim);
  background: transparent;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.nav-pill.active, .nav-pill:hover,
a.nav-pill:hover {
  background: var(--surface-3);
  color: var(--text);
}

.nav-pill.active {
  color: var(--accent);
}

a.hamburger-item {
  text-decoration: none;
}

/* ─── TOPBAR RESPONSIVE ─── */
.topbar-sub {
  display: none;
}

/* 汉堡按钮 — 默认隐藏，移动端显示 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  padding: 8px;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 100%; height: 1.5px;
  background: var(--text-dim);
  border-radius: 1px;
  transition: all 0.2s;
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* 下拉菜单 */
.hamburger-menu {
  display: none;
  position: absolute;
  top: 57px; right: 0;
  width: 100%;
  background: var(--surface-1);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  z-index: 200;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s, transform 0.18s;
}
.hamburger-menu.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.hamburger-sub {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 2px;
  color: var(--text-faint);
  padding: 14px 20px 6px;
}
.hamburger-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}
.hamburger-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: background 0.15s, color 0.15s;
}
.hamburger-item:hover { background: var(--surface-2); color: var(--text); }
.hamburger-item.active { color: var(--accent); }


/* ─── NAV RESPONSIVE ─── */
@media (max-width: 900px) {
  .topbar-sub { display: none; }
  .topbar-nav { display: none; }
  .hamburger { display: flex; }
  .hamburger-menu { display: flex; position: fixed; top: 57px; }
}
@media (max-width: 480px) {
  .topbar { padding: 14px 16px; }
}

/* ─── SYSTEM FOOTER ─── */
.system-footer {
  border-top: 1px solid var(--border);
  padding: 20px 28px;
  text-align: center;
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text-faint);
  letter-spacing: 1px;
}
.system-footer--full { width: 100%; }

/* ─── SHARED CTA BUTTON (about / terms / privacy) ─── */
.about-cta {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent);
  padding: 10px 22px;
  border-radius: 2px;
  transition: background 0.15s, color 0.15s;
}
.about-cta:hover {
  background: var(--accent);
  color: #fff;
}