* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* =====================
   THEME VARIABLES
===================== */
:root {
  --bg: #aac0c9;
  --bg-soft: #c7eafb;
  --text: #000000;
  --primary: #f6c14e;
  --border: #ffffff;
  --accent: #aac6d3;

  --btn-bg: var(--primary);
  --btn-text: var(--text);
}

body.darkmode {
  --bg: #121212;
  --bg-soft: #1e1e1e;
  --text: #ffffff;
  --primary: #f78af2;
  --border: #333333;
  --accent: #2a2a2a;

  --btn-bg: var(--primary);
  --btn-text: #000000;
}

/* =====================
   BASE STYLES
===================== */
body {
  font-family: "Sour Gummy", sans-serif;
  padding: 10px;
  background: var(--bg);
  color: var(--text);
  height: 90vh;
}

main {
  background-color: var(--bg);
}

a,
p,
h1,
h2,
h3,
ol {
  color: var(--text);
  font-family: "Sour Gummy", sans-serif;
}

/* =====================
   DARK MODE BUTTON
===================== */
#change-darkmode {
  height: 50px;
  width: 50px;
  padding: 0;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg);
  position: fixed;
  top: 20px;
  right: 20px;
}

/* =====================
   HEADER & FOOTER
===================== */
header {
  background-color: var(--bg);
  color: var(--text);
  padding: 10px 0;
  text-align: center;
  font-size: 40px;
  font-family: monospace;
  margin: 0 auto;
}

footer,
.footer {
  background-color: var(--bg);
  color: var(--text);
  text-align: center;
  margin-top: 10px;
  padding: 10px;
  clear: both;
}

/* =====================
   NAVIGATION
===================== */
#navigation {
  width: 100%;
  background-color: var(--bg);
  height: 35px;
  text-align: center;
}

/* =====================
   UNIVERSAL BUTTON STYLE
   (links, nav, buttons)
===================== */
button,
.links a,
#navigation a,
.Button,
.Button2 {
  font-family: "Sour Gummy", sans-serif;
  font-size: 18px;
  color: var(--btn-text);
  background-color: var(--btn-bg);
  border: 3px solid var(--border);
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

/* Hover (shared) */
button:hover,
.links a:hover,
#navigation a:hover,
.Button:hover,
.Button2:hover {
  background-color: var(--bg);
  color: var(--text);
}

/* =====================
   LINKS GROUP
===================== */
.links {
  display: flex;
  justify-content: center;
  gap: 20px;
}

/* =====================
   CONTAINERS
===================== */
.container {
  text-align: center;
  padding: 20px;
}

.container2 {
  padding: 20px;
}

/* =====================
   COLUMNS
===================== */
.leftcolumn {
  float: left;
  width: 70%;
  border: 1px solid var(--accent);
  background-color: var(--bg-soft);
  padding: 10px;
  margin-top: 20px;
}

.rightcolumn {
  float: right;
  width: 28.5%;
  border: 1px solid var(--accent);
  background-color: var(--bg-soft);
  padding: 10px;
  margin-top: 20px;
  margin-left: 20px;
}

/* =====================
   HEADER BLOCK
===================== */
.header {
  padding: 1px;
  font-size: 40px;
  text-align: center;
  background: var(--bg);
}

/* =====================
   RESPONSIVE
===================== */
@media (max-width: 600px) {
  h1 {
    font-size: 2rem;
  }

  .links {
    flex-direction: column;
  }

  .links a {
    width: 100%;
  }
}

.note-item {
  width: 100%;
  margin: 5px 0;
  padding: 10px;
  cursor: pointer;
}

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  justify-content: center;
  align-items: center;
}

.modal-content {
  background: white;
  padding: 20px;
  max-width: 500px;
  width: 90%;
  border-radius: 12px;
}

.darkmode .modal-content {
  background: #1e1e1e;
  color: white;
}