@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600&display=swap");

:root {
  --bg: #0d0e10;
  --bg-elev: #141518;
  --card: #17191d;
  --card-2: #1b1e23;
  --text: #eceff4;
  --muted: #989eaa;
  --accent: #b8c2d8;
  --accent-soft: rgba(184, 194, 216, 0.12);
  --border-soft: #2a2e36;
  --border-hard: #3a3f48;
  --shadow-soft: 0 18px 42px rgba(0, 0, 0, 0.46);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.02);
  --highlight: #f0f3fb;
  --surface-glow: radial-gradient(circle at 20% 0%, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0));
}

body.dark {
  --bg: #08090a;
  --bg-elev: #111216;
  --card: #121419;
  --card-2: #171a20;
  --text: #f5f7fb;
  --muted: #a3abbb;
  --accent: #d2d8e5;
  --accent-soft: rgba(210, 216, 229, 0.16);
  --border-soft: #2f3440;
  --border-hard: #464d5a;
  --shadow-soft: 0 22px 52px rgba(0, 0, 0, 0.6);
  --highlight: #ffffff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--surface-glow), var(--bg);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  letter-spacing: 0.01em;
  transition: background 0.25s ease, color 0.25s ease;
}

h1,
h2,
h3,
h4,
h5,
h6,
.logo {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  letter-spacing: 0.01em;
}

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

.global-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.2rem;
  background: rgba(12, 13, 16, 0.86);
  border-bottom: 1px solid var(--border-soft);
  backdrop-filter: blur(10px);
}

.logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.header-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.header-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.header-nav a:hover {
  color: var(--text);
  border-color: var(--border-soft);
  background: var(--accent-soft);
}

.theme-toggle,
.theme-btn {
  border: 1px solid var(--border-hard);
  background: linear-gradient(180deg, var(--card-2), var(--card));
  color: var(--text);
  border-radius: 999px;
  padding: 0.48rem 0.95rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-inset);
}

.theme-toggle:hover,
.theme-btn:hover {
  border-color: var(--accent);
  color: var(--highlight);
}

.global-footer {
  margin-top: 2rem;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--border-soft);
  padding: 1.25rem;
  background: var(--bg-elev);
}

.global-footer p {
  margin: 0;
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .global-header {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 0.7rem;
    padding: 0.8rem;
  }

  .header-nav {
    width: 100%;
    justify-content: center;
  }
}