:root {
  --aero-bg-top: #eaf6ff;
  --aero-bg-mid: #c9e6ff;
  --aero-bg-bottom: #ffffff;

  --aero-glass-top: rgba(255,255,255,0.7);
  --aero-glass-bottom: rgba(255,255,255,0.45);
  --aero-border: rgba(255,255,255,0.8);

  --text-main: #1b2a33;
  --link-blue: #1b5fa7;
}

/* RESET BUT POLITE */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(
      circle at top,
      var(--aero-bg-top),
      var(--aero-bg-mid) 60%,
      var(--aero-bg-bottom)
    );
}

/* AERO PANEL */
.aero {
  background: linear-gradient(
    180deg,
    var(--aero-glass-top),
    var(--aero-glass-bottom)
  );
  backdrop-filter: blur(22px);
  border-radius: 12px;
  border: 1px solid var(--aero-border);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.8),
    0 10px 30px rgba(0,0,0,0.12);
}

/* TOP BAR / NAV */
.topbar {
  position: sticky;
  top: 0;
  padding: 14px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.65),
    rgba(255,255,255,0.35)
  );
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.7);
}

.topbar a {
  margin-left: 22px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 0.95rem;
}

/* HEADERS */
h1, h2, h3 {
  font-weight: 500;
}

/* LINKS */
a {
  color: var(--link-blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* BUTTONS */
.btn,
button,
a.btn {
  display: inline-block;
  padding: 12px 26px;
  margin: 6px;
  border-radius: 6px;
  border: 1px solid rgba(0,0,0,0.15);
  background: linear-gradient(180deg, #ffffff, #cfe8ff);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.9),
    0 2px 6px rgba(0,0,0,0.15);
  cursor: pointer;
  color: var(--text-main);
  text-decoration: none;
}

.btn:hover,
button:hover {
  background: linear-gradient(180deg, #ffffff, #b6dcff);
}

/* SECTIONS */
.section {
  max-width: 1000px;
  margin: 40px auto;
  padding: 36px;
}

/* HERO */
.hero {
  padding: 90px 24px 60px;
  display: flex;
  justify-content: center;
  text-align: center;
}

.hero .aero {
  max-width: 760px;
  padding: 48px;
}

/* FEATURES / CARDS */
.features {
  display: flex;
  gap: 28px;
  justify-content: center;
  padding: 40px 24px;
  flex-wrap: wrap;
}

.feature,
.project {
  padding: 24px;
}

/* PROJECT GRID */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

/* ARTICLE LIST */
.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-list li {
  padding: 14px 16px;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-list li + li {
  border-top: 1px solid rgba(255,255,255,0.4);
}

.article-list li:hover {
  background: rgba(255,255,255,0.35);
}

.article-list span {
  font-size: 0.85rem;
  opacity: 0.6;
}

/* CENTERED PAGE (404 ETC) */
.centered {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* FOOTER */
footer {
  margin-top: 80px;
  padding: 24px;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.65;
}


/* ---------------------------------------------------
  HOW TO USE THIS STYLE.CSS
---------------------------------------------------
1. Link it in the <head> of every HTML page:

    <link rel="stylesheet" href="/style.css">

2. Wrap panels/content with the class "aero":

    <div class="aero">
      ...your content...
    </div>

3. Use .section for page sections with padding/margins:

    <section class="section aero">
      ...section content...
    </section>

4. Buttons: <button class="btn">Click</button> or <a class="btn" href="#">Link</a>

5. Lists of articles: use <ul class="article-list"><li>...</li></ul>

6. Links: <a href="mailto:you@example.com">Email me</a> or <a href="https://github.com">GitHub</a>

7. Footer: <footer class="aero">...</footer>

This keeps a **consistent Windows 7 Aero theme** across your portfolio, 404 pages, projects, and any other content.
*/