header {
  position: sticky; top: 0; z-index: 200;
  background: var(--header-bg); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; height: 54px;
  transition: background .25s, border-color .25s;
}
.logo {
  font-size: 15px; font-weight: 700; letter-spacing: -.02em; color: var(--text);
  display: flex; align-items: center; gap: 10px; user-select: none;
}
.logo-icon {
  width: 28px; height: 28px; flex-shrink: 0;
}
.logo-wordmark { display: flex; align-items: baseline; gap: 6px; }
.logo-name { font-size: 15px; font-weight: 700; letter-spacing: -.03em; }
.logo-ver { font-size: 10px; font-weight: 500; color: var(--text3); font-family: var(--mono);
  background: var(--bg4); border: 1px solid var(--border2); border-radius: 4px; padding: 1px 5px; }

.header-right { display: flex; align-items: center; gap: 4px; }
nav { display: flex; gap: 2px; }
.nav-btn {
  background: none; border: none; color: var(--text2); cursor: pointer;
  padding: 6px 14px; border-radius: 7px; font-size: 13px; font-weight: 500;
  transition: background .15s, color .15s; letter-spacing: -.01em;
}
.nav-btn:hover { background: var(--bg3); color: var(--text); }
.nav-btn.active { background: var(--bg4); color: var(--text); }

.theme-btn {
  width: 32px; height: 32px; border-radius: 8px; border: 1px solid var(--border2);
  background: var(--bg3); color: var(--text2); cursor: pointer; font-size: 15px;
  display: flex; align-items: center; justify-content: center; margin-left: 8px;
  transition: background .15s, border-color .15s, color .15s, transform .15s;
  flex-shrink: 0;
}
.theme-btn:hover { background: var(--bg4); color: var(--text); border-color: var(--accent); transform: scale(1.05); }

.page { display: none; }
.page.visible { display: block; }

#results { display: none; }
#results.show { display: block; }
.results-wrap { max-width: 1100px; margin: 0 auto; padding: 28px 24px 60px; }

.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 10px; }
.result-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text3); }
.result-file { font-family: var(--mono); font-size: 14px; color: var(--text); font-weight: 600; }

.atab-bar {
  display: flex; gap: 2px; margin-bottom: 18px;
  border-bottom: 1px solid var(--border); padding-bottom: 0;
}
.atab-btn {
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--text2); cursor: pointer; padding: 8px 16px 10px;
  font-size: 13px; font-weight: 500; letter-spacing: -.01em;
  transition: color .15s, border-color .15s; margin-bottom: -1px;
  white-space: nowrap;
}
.atab-btn:hover { color: var(--text); }
.atab-btn.active { color: var(--text); border-bottom-color: var(--accent); }
.atab-panel { display: none; }
.atab-panel.active { display: block; }

/* ── User account menu ────────────────────────────────────────────────────── */
.user-menu { position: relative; margin-left: 4px; }
.user-btn {
  display: flex; align-items: center; gap: 6px;
  background: none; border: 1px solid var(--border2); border-radius: 7px;
  color: var(--text2); cursor: pointer; padding: 5px 10px;
  font-size: 12px; font-weight: 500;
  transition: border-color .15s, color .15s, background .15s;
}
.user-btn:hover { border-color: var(--accent); color: var(--text); background: var(--bg3); }
.user-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: var(--bg2); border: 1px solid var(--border2); border-radius: 9px;
  padding: 4px; min-width: 148px; z-index: 300;
  box-shadow: 0 8px 24px rgba(0,0,0,.25);
}
.user-dropdown.open { display: block; }
.user-dropdown-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 8px 12px; border-radius: 6px;
  background: none; border: none; color: var(--text2);
  font-size: 13px; cursor: pointer; text-align: left;
  transition: background .12s, color .12s; white-space: nowrap;
}
.user-dropdown-item:hover { background: var(--bg3); color: var(--text); }
.signout-btn:hover { color: var(--red); }
.user-dropdown-item.danger-item {
  text-decoration: none;
  border-top: 1px solid var(--border);
  margin-top: 4px; padding-top: 10px;
  color: var(--text3);
}
.user-dropdown-item.danger-item:hover {
  background: rgba(240,96,96,.10);
  color: var(--red);
}
.user-dropdown-divider {
  height: 1px; background: var(--border); margin: 4px 8px;
}
.user-dropdown-item.legal-item {
  color: var(--text3); font-size: 12px; text-decoration: none;
}
.user-dropdown-item.legal-item:hover { color: var(--text); background: var(--bg3); }

@media (max-width: 768px) {
  header { padding: 0 14px; }
  nav { gap: 0; }
  .nav-btn { padding: 6px 9px; font-size: 12px; }
  .results-wrap { padding: 16px 12px 40px; }
  .atab-bar { gap: 0; overflow-x: auto; }
  .atab-btn { padding: 8px 10px 10px; font-size: 12px; }
  .result-header { flex-direction: column; align-items: flex-start; }
  .user-btn span { display: none; } /* show icon only on mobile */
}

/* ── Guest mode ───────────────────────────────────────────────────────────── */
.guest-signin-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--accent);
  color: #fff;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity .15s;
}
.guest-signin-btn:hover { opacity: .85; color: #fff; }

.guest-cta-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; background: var(--accent); color: #fff;
  border: none; border-radius: 8px;
  font-size: 13px; font-weight: 600; text-decoration: none;
  white-space: nowrap;
  transition: opacity .15s, transform .1s;
  box-shadow: 0 2px 8px rgba(96, 165, 250, .25);
}
.guest-cta-btn:hover { opacity: .92; color: #fff; transform: translateY(-1px); }
.guest-cta-btn:active { transform: translateY(0); }
.guest-cta-btn-lg { padding: 11px 20px; font-size: 14px; gap: 8px; }

.guest-cta-banner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
  padding: 16px 22px; margin: 14px 0 8px;
  background: linear-gradient(135deg, rgba(96, 165, 250, .12), rgba(96, 165, 250, .04));
  border: 1px solid rgba(96, 165, 250, .35);
  border-radius: 12px;
}
.guest-cta-text { flex: 1; min-width: 220px; }
.guest-cta-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 3px; }
.guest-cta-sub { font-size: 12.5px; color: var(--text2); line-height: 1.5; }