@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap");

:root {
  color-scheme: dark;
  --main-background-start: #0d1e38;
  --main-background-end: #4493b8;
  --particle-accent: #ffc766;
  --header-color: #7dadee;
  --header-secondary: #88a4cc;
  --background-primary: #19212d;
  --background-secondary: #2d3646;
  --text-main: whitesmoke;
  --text-secondary: #c8c8c8;
  --yellow: #ffb700;
  --yellow-hover: #9d7100;
  --code-background: #19212d;
  --code-border: #1d2939;
  --card-shadow: 5px 5px 16px rgba(0, 0, 0, .2);
}

:root[data-theme="light"] {
  color-scheme: light;
  --main-background-start: #cbddf7;
  --main-background-end: #fff;
  --particle-accent: #9b9b9b;
  --header-color: #102d55;
  --header-secondary: #1a345a;
  --background-primary: whitesmoke;
  --background-secondary: #fff;
  --text-main: #000;
  --text-secondary: #373737;
  --code-background: #f4faff;
  --code-border: #ccd3e5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(var(--main-background-start), var(--main-background-end));
  color: var(--text-main);
  font-family: "Poppins", sans-serif;
}

button,
input,
textarea { font: inherit; }

.main-header {
  position: absolute;
  z-index: 100;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 15px 20px;
}

.site-logo {
  color: var(--text-main);
  font-size: 1cm;
  font-weight: 800;
  letter-spacing: -1px;
  text-decoration: none;
}

.main-header nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.main-header nav form { display: contents; }

.main-header nav a,
.main-header nav button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 6px 15px;
  border: 0;
  border-radius: 20px;
  background: transparent;
  color: var(--text-main);
  font-size: 17px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s, color .25s, background .25s;
}

.main-header nav a:hover,
.main-header nav button:hover {
  transform: translateY(-1px);
  background: lightgreen;
  color: darkgreen;
}

.main-header nav a.active {
  background: var(--yellow);
  color: #111;
}

.main-header nav a.active:hover {
  background: var(--yellow-hover);
  color: var(--text-main);
}

.main-header nav .theme-toggle {
  width: 38px;
  padding: 5px;
  background: var(--text-main);
  color: var(--main-background-start);
  font-size: 23px;
  line-height: 1;
}

.main-header nav .theme-toggle:hover {
  background: gray;
  color: var(--text-main);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 35px max(20px, calc((100% - 1000px) / 2));
  background: linear-gradient(var(--background-secondary), var(--background-primary));
  color: var(--text-secondary);
  font-size: 12px;
}

@media (max-width: 600px) {
  .main-header {
    justify-content: center;
    padding: 15px 10px;
  }

  .site-logo { display: none; }

  .main-header nav {
    max-width: 100%;
    flex-wrap: wrap;
  }

  .main-header nav a,
  .main-header nav button {
    min-height: 36px;
    padding: 5px 11px;
    font-size: 15px;
  }

  .main-header nav .theme-toggle { width: 36px; }
  .site-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}