/* === Theme Variables for Light/Dark Mode === */
:root {
  /* Theme colors */
  --bg-color: #ffffff;
  --text-color: #222222;
  --header-bg: #0055aa;
  --header-text: #ffffff;
  --page-bg: #f9f9f9;
  --form-bg: #f9f9f9;
  --input-bg: #ffffff;
  --input-border: #ccc;
  --button-bg: #0055aa;
  --button-hover: #0077dd;
  --card-border: #ccc;
  --link-color: #0055aa;
  --nav-hover-bg: #003366;
  
  /* Existing variables */
  --main-color: #0055aa;
  --accent: #00bcd4;
  --main-font: Arial, sans-serif;
}

/* Dark mode theme */
[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --header-bg: #0d3a5c;
  --header-text: #ffffff;
  --page-bg: #2a2a2a;
  --form-bg: #2a2a2a;
  --input-bg: #333333;
  --input-border: #555555;
  --button-bg: #0066cc;
  --button-hover: #0088ff;
  --card-border: #444444;
  --link-color: #5ca3ff;
  --nav-hover-bg: #1a4d7a;
  --main-color: #0066cc;
}

/* Apply theme transitions */
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* === Custom Font === */
@font-face {
  font-family: 'MainFont';
  src: url('fonts/Poppins-Regular.woff2') format('woff2');
}

/* === Base Styles === */
body {
  font-family: 'MainFont', var(--main-font, Arial, sans-serif);
  background: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
}

/* === Header === */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--header-bg);
  color: var(--header-text);
  padding: 1rem;
}

nav ul {
  display: flex;
  gap: 1rem;
  list-style: none;
  padding: 0;
}

nav a {
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  color: var(--header-text);
  text-decoration: none;
}

nav a:hover, nav a:focus {
  background: var(--nav-hover-bg);
  color: #fff;
}

:is(header, footer) a {
  color: var(--header-text);
  text-decoration: none;
}

/* === Main Content === */
main {
  padding: 2rem;
  font-size: 1rem;
}

.hero-section {
  min-height: 50dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* === Headings === */
h1, h2, h3 {
  color: var(--text-color);
  margin-top: 1rem;
}

/* === Cards and Projects === */
project-card {
  display: block;
  border: 1px solid var(--card-border);
  padding: 1rem;
  transition: transform 0.3s;
  background: var(--form-bg);
}

project-card:hover {
  transform: scale(1.02);
}

/* === Buttons === */
button {
  background: var(--button-bg);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: var(--button-hover);
}

/* === Links === */
a {
  color: var(--link-color);
}

a:hover {
  text-decoration: underline;
}

/* === Forms === */
input[type="text"],
input[type="email"],
textarea {
  background-color: var(--input-bg);
  color: var(--text-color);
  border: 2px solid var(--input-border);
}

/* === Images === */
img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  object-position: center;
}

picture, .animation-container, .image-gallery {
  background: var(--form-bg);
  padding: 0.5rem;
  border-radius: 4px;
}

svg {
  color: var(--main-color);
}

/* === Sections and Footer === */
section, footer {
  margin-bottom: 2rem;
  padding: 1rem;
}

/* === Theme Toggle Button === */
.theme-toggle {
  position: fixed;
  top: 80px;
  right: 30px;
  padding: 12px 24px;
  background-color: var(--button-bg);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 25px;
  cursor: pointer;
  font-size: 1.1rem;
  z-index: 9999;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  font-weight: 600;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.4);
}

/* No-JS fallback message */
.theme-toggle-nojs {
  display: none;
  padding: 10px;
  background: #fff3cd;
  border: 1px solid #ffc107;
  margin: 10px;
  text-align: center;
  color: #856404;
}

/* === Responsive Design === */

/* Tablet */
@media (max-width: 1024px) {
  main {
    grid-template-columns: 1fr;
    padding: 1rem;
  }
  project-card {
    margin-bottom: 1rem;
  }
}

/* Phone */
@media (max-width: 700px) {
  nav ul {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 600px) {
  header {
    align-items: flex-start;
  }

  nav ul {
    display: none;
  }

  header::after {
    content: "☰ Menu";
    color: white;
    font-size: 1.2rem;
    margin-top: 0.5rem;
  }

  .hero-section {
    min-height: 60dvh;
    padding: 1rem;
  }

  img {
    width: 100%;
    height: auto;
  }
  
  .theme-toggle {
    top: 15px;
    right: 15px;
    padding: 10px 18px;
    font-size: 1rem;
  }
}