:root {
  --accent: #72f1b8;
  --accent-rgb: 114, 241, 184;
}

[data-bs-theme="dark"] {
  --bs-body-bg: #07111f;
  --bs-body-color: #eef4ff;
  --bs-secondary-color: #a8b6cb;
  --bs-border-color: rgba(114, 241, 184, 0.22);
  --card-bg: rgba(8, 15, 28, 0.76);
  --bg-gradient: linear-gradient(145deg, #07111f, #11243b);
}

[data-bs-theme="light"] {
  --bs-body-bg: #f4f7fb;
  --bs-body-color: #1a2332;
  --bs-secondary-color: #5a6a7a;
  --bs-border-color: rgba(114, 241, 184, 0.35);
  --card-bg: rgba(255, 255, 255, 0.85);
  --bg-gradient: linear-gradient(145deg, #e8eef5, #f4f7fb);
  --accent: #0d9668;
  --accent-rgb: 13, 150, 104;
}

* {
  user-select: none;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(var(--accent-rgb), 0.16), transparent 28%),
    radial-gradient(circle at 80% 0%, rgba(94, 168, 255, 0.18), transparent 25%),
    var(--bg-gradient);
}

.card-main {
  width: min(92vw, 720px);
  padding: 52px 34px;
  border: 1px solid var(--bs-border-color);
  border-radius: 28px;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.tag {
  display: inline-block;
  margin-bottom: 18px;
  padding: 7px 14px;
  border: 1px solid var(--bs-border-color);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.3rem, 6vw, 4.4rem);
  line-height: 0.95;
  letter-spacing: 0.03em;
}

.text-muted-custom {
  color: var(--bs-secondary-color);
  font-size: 1.06rem;
  line-height: 1.75;
}

.menu-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1050;
}

.menu-left {
  position: relative;
}

.menu-btn,
.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--card-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: 12px;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: border-color 0.2s, box-shadow 0.2s;
  color: var(--accent);
}

.menu-btn:hover,
.theme-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 16px rgba(var(--accent-rgb), 0.25);
}

.menu-btn {
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}

.menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.theme-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.menu-panel {
  position: absolute;
  top: 54px;
  left: 0;
  min-width: 160px;
  padding: 8px 0;
  background: var(--card-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: 14px;
  backdrop-filter: blur(12px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}

.menu-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.menu-panel a {
  display: block;
  padding: 12px 20px;
  color: var(--bs-body-color);
  text-decoration: none;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s;
}

.menu-panel a:hover {
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent);
}