/* -------------------------------
   Global Styles
-------------------------------- */

:root {
  --border-radius: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);

  /* Colors */
  --background-color: #f5f5f5;
  --card-background-color: #fff;
  --text-color: #333;
  --accent-color: #006699;
  --link-hover-color: #003d4d;
  --header-p-color: #555;
  --footer-color: #777;
  --theme-button-hover-color: #004466;

  /* Dark mode colors */
  --dark-background: #1e1e1e;
  --dark-text: #eee;
  --dark-p: #ccc;
  --dark-card-background: #333;
  --dark-card-border: #444;
  --dark-link: #66ccff;
  --dark-link-hover: #9fdfff;
  --dark-footer: #aaa;
}

* {
  box-sizing: border-box;
}

/* Set base font size to 62.5% (10px) so 1rem = 10px */
html {
  font-size: 62.5%;
}

body {
  margin: 0;
  padding: 10px 20px;
  font-family: "Inter", sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

h1,
h2,
h3 {
  letter-spacing: 0.5px;
  text-align: center;
}

/* -------------------------------
   Header
-------------------------------- */

header {
  text-align: center;
  margin-bottom: 20px;
}

h1 {
  font-size: 2.3rem;
  margin-bottom: 5px;
}

header p {
  font-size: 1.4rem;
  color: var(--header-p-color);
}

/* -------------------------------
   Projects Section
-------------------------------- */

.projects {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 20px;
}

.projects h2 {
  font-size: 2rem;
  margin-bottom: 10px;
}

/* Project Cards */

.project-card {
  background-color: var(--card-background-color);
  padding: 10px;
  margin: 15px 0;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease;
}

.project-card:hover {
  transform: scale(1.01);
}

.project-card img {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  margin-bottom: 10px;
}

.project-card h3 {
  margin: 0 0 5px;
  font-size: 1.8rem;
}

.project-card h4 {
  margin: 0;
  font-size: 1.6rem;
}

.project-card p {
  font-size: 1.4rem;
  margin: 5px 0 10px 0;
}

/* Links */

.project-links a {
  display: inline-block;
  margin-right: 20px;
  text-decoration: none;
  color: var(--accent-color);
  font-weight: bold;
  transition: color 0.2s ease;
  font-size: 1.4rem;
}

.project-links a:hover {
  color: var(--link-hover-color);
}

/* -------------------------------
   Footer
-------------------------------- */

footer {
  text-align: center;
  margin-top: 30px;
  font-size: 1rem;
  color: var(--footer-color);
}

/* -------------------------------
   Scroll to Top Button
-------------------------------- */

#scrollToTopBtn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  font-size: 1.8rem;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

#scrollToTopBtn:hover {
  background-color: var(--theme-button-hover-color);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px); /* subtle lift */
}

/* -------------------------------
   Dark Mode Styles
-------------------------------- */

body,
.project-card {
  transition: background-color 0.4s ease, color 0.4s ease;
}

body.dark-mode {
  background-color: var(--dark-background);
  color: var(--dark-text);
}

body.dark-mode p {
  color: var(--dark-p);
}

body.dark-mode .project-card {
  background-color: var(--dark-card-background);
  color: var(--dark-text);
  border: 1px solid var(--dark-card-border);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
}

body.dark-mode a {
  color: var(--dark-link);
}

body.dark-mode a:hover {
  color: var(--dark-link-hover);
}

body.dark-mode footer {
  color: var(--dark-footer);
}

/* Theme Control Buttons  */

#themeControls {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

#resetThemeBtn {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

#resetThemeBtn.show {
  opacity: 1;
  visibility: visible;
}

#themeControls button {
  padding: 8px 10px;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 1.6rem;
}

#themeControls button:hover {
  background-color: var(--theme-button-hover-color);
}

/* -------------------------------
   Media Queries
-------------------------------- */

/* Tablet */

@media (min-width: 768px) {
  body {
    padding: 20px 40px;
  }

  h1 {
    font-size: 2.6rem;
  }

  header p {
    font-size: 1.6rem;
  }

  .projects {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .projects h2 {
    grid-column: 1 / -1; /* Span all columns and centers the heading */
    margin-bottom: 0;
    font-size: 2.2rem;
  }

  .project-card {
    margin-bottom: 0;
  }

  .project-card h3 {
    font-size: 2rem;
  }

  .project-card h4 {
    font-size: 1.8rem;
  }

  .project-card p {
    font-size: 1.6rem;
  }

  footer {
    font-size: 1.2rem;
  }
}

/* Desktop */

@media (min-width: 1024px) {
  .projects {
    grid-template-columns: repeat(3, 1fr);
  }

  h1 {
    font-size: 2.8rem;
  }

  header p {
    font-size: 1.8rem;
  }

  .projects h2 {
    font-size: 2.4rem;
  }

  .project-card h3 {
    font-size: 2.2rem;
  }

  .project-card h4 {
    font-size: 2rem;
  }

  .project-card p {
    font-size: 1.8rem;
  }

  footer {
    font-size: 1.4rem;
  }
}