:root {
  --page-background: #f5f7fb;
  --surface: #ffffff;
  --surface-alt: #eef2ff;
  --surface-border: rgba(148, 163, 184, 0.18);
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-contrast: #f8fafc;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition-base: 0.25s ease;
  --top-button-container-bg: rgba(255, 255, 255, 0.9);
  --top-button-container-border: rgba(148, 163, 184, 0.35);
  --top-button-container-shadow: 0 24px 48px rgba(15, 23, 42, 0.08);
  --top-button-bg: rgba(37, 99, 235, 0.12);
  --top-button-bg-hover: rgba(37, 99, 235, 0.18);
  --top-button-border: rgba(37, 99, 235, 0.24);
  --top-button-border-hover: rgba(37, 99, 235, 0.35);
  --top-button-text: #1e293b;
  --top-button-text-hover: #0f172a;
  --top-button-shadow: 0 10px 26px rgba(37, 99, 235, 0.15);
  --top-button-shadow-hover: 0 16px 36px rgba(37, 99, 235, 0.2);
  --identity-bg: rgba(255, 255, 255, 0.92);
  --identity-border: rgba(148, 163, 184, 0.35);
  --identity-text: #0f172a;
  --identity-shadow: 0 24px 46px rgba(15, 23, 42, 0.12);
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Poppins', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--page-background);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--accent-strong);
}

.top-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 auto 2.5rem;
  padding: 0.75rem 1rem;
  max-width: min(960px, calc(100% - 2rem));
  border-radius: 999px;
  background: var(--top-button-container-bg);
  border: 1px solid var(--top-button-container-border);
  box-shadow: var(--top-button-container-shadow);
  backdrop-filter: blur(12px);
}

.top-buttons a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.01em;
  background: var(--top-button-bg);
  color: var(--top-button-text);
  border: 1px solid var(--top-button-border);
  box-shadow: var(--top-button-shadow);
  transition: transform var(--transition-base),
    background var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base);
}

.top-buttons a:hover {
  transform: translateY(-2px);
  background: var(--top-button-bg-hover);
  box-shadow: var(--top-button-shadow-hover);
  border-color: var(--top-button-border-hover);
  color: var(--top-button-text-hover);
}

body:not(.landing) .top-buttons {
  padding: 0;
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

body:not(.landing) .top-buttons a {
  box-shadow: none;
}

body.theme-dark {
  position: relative;
  overflow-x: hidden;
  --page-background: radial-gradient(140% 140% at 16% 0%, #1c2640 0%, #0b1220 55%, #05070c 100%);
  --surface: rgba(17, 24, 39, 0.75);
  --surface-alt: rgba(30, 41, 59, 0.85);
  --surface-border: rgba(148, 163, 184, 0.24);
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --accent: #22d3ee;
  --accent-strong: #38bdf8;
  --accent-contrast: #04111d;
  --top-button-container-bg: rgba(15, 23, 42, 0.65);
  --top-button-container-border: rgba(94, 234, 212, 0.35);
  --top-button-container-shadow: 0 30px 60px rgba(7, 11, 23, 0.55);
  --top-button-bg: rgba(34, 211, 238, 0.18);
  --top-button-bg-hover: rgba(56, 189, 248, 0.28);
  --top-button-border: rgba(45, 212, 191, 0.45);
  --top-button-border-hover: rgba(56, 189, 248, 0.6);
  --top-button-text: #e2e8f0;
  --top-button-text-hover: #f8fafc;
  --top-button-shadow: 0 24px 54px rgba(8, 15, 35, 0.45);
  --top-button-shadow-hover: 0 32px 68px rgba(8, 15, 35, 0.6);
  --identity-bg: rgba(15, 23, 42, 0.7);
  --identity-border: rgba(148, 163, 184, 0.32);
  --identity-text: #e2e8f0;
  --identity-shadow: 0 36px 68px rgba(5, 10, 25, 0.65);
}

body.theme-dark::before,
body.theme-dark::after {
  content: '';
  position: fixed;
  width: min(55vw, 620px);
  height: min(55vw, 620px);
  filter: blur(120px);
  opacity: 0.45;
  z-index: 0;
  pointer-events: none;
}

body.theme-dark::before {
  top: -18vh;
  left: -12vw;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.4), transparent 60%);
}

body.theme-dark::after {
  bottom: -22vh;
  right: -12vw;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.32), transparent 60%);
}

.floating-identity {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--identity-bg);
  border: 1px solid var(--identity-border);
  border-radius: var(--radius-md);
  box-shadow: var(--identity-shadow);
  color: var(--identity-text);
  backdrop-filter: blur(18px);
  z-index: 1000;
}

.floating-identity__stats {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.95rem;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.floating-identity__label {
  font-weight: 600;
}

.floating-identity__value {
  opacity: 0.8;
}

.floating-identity__stats:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.floating-identity__button {
  border: none;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: transform var(--transition-base),
    box-shadow var(--transition-base),
    background var(--transition-base);
  box-shadow: 0 16px 32px rgba(37, 99, 235, 0.25);
}

.floating-identity__button:hover {
  transform: translateY(-1px);
  box-shadow: 0 24px 44px rgba(37, 99, 235, 0.3);
  background: var(--accent-strong);
}

@media (max-width: 640px) {
  .floating-identity {
    position: static;
    margin: 1rem auto 0;
    width: min(100%, 420px);
    justify-content: space-between;
  }

  .top-buttons {
    flex-direction: column;
    align-items: stretch;
    width: min(100%, 420px);
    padding: 1rem;
    gap: 0.65rem;
    margin-bottom: 2rem;
    border-radius: var(--radius-lg);
  }

  .top-buttons a {
    width: 100%;
  }
}