/* Theme tokens and shared site styles */
:root {
  color-scheme: light dark;

  --page-bg: #f4f7fb;
  --surface-bg: #ffffff;
  --surface-bg-alt: #f8fafc;
  --header-bg: #ffffff;
  --header-text: #1f2933;
  --header-image: url('../images/Logos/banner2_light.png');
  --footer-bg: #e8f0f8;
  --footer-text: #1f2933;
  --text-primary: #1f2933;
  --text-muted: #52606d;
  --text-subtle: #697586;
  --text-inverse: #ffffff;
  --border-color: #d8e2ee;
  --shadow-color: rgba(15, 23, 42, 0.14);
  --shadow-color-strong: rgba(15, 23, 42, 0.24);
  --accent: #2878b8;
  --accent-hover: #1f669d;
  --success: #198f55;
  --success-hover: #137944;
  --danger: #c0392b;
  --warning: #a86614;
  --input-bg: #ffffff;
  --input-text: #1f2933;
  --input-border: #c8d2df;
  --image-placeholder: #e3e8ef;
  --model-viewer-bg: #eef3f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;

    --page-bg: #242526;
    --surface-bg: #242526;
    --surface-bg-alt: #1e1e1f;
    --header-bg: #242526;
    --header-text: #ffffff;
    --header-image: url('../images/Logos/banner2.png');
    --footer-bg: #34495e;
    --footer-text: #ffffff;
    --text-primary: #ffffff;
    --text-muted: #a3a3a3;
    --text-subtle: #cccccc;
    --text-inverse: #ffffff;
    --border-color: #3a3b3c;
    --shadow-color: #3a3b3c;
    --shadow-color-strong: #57585a;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --success: #2ecc71;
    --success-hover: #27ae60;
    --danger: #e74c3c;
    --warning: #f39c12;
    --input-bg: #1e1e1f;
    --input-text: #ffffff;
    --input-border: #57585a;
    --image-placeholder: #1e1e1f;
    --model-viewer-bg: #1e1e1f;
  }
}

:root[data-theme="light"] {
  color-scheme: light;

  --page-bg: #f4f7fb;
  --surface-bg: #ffffff;
  --surface-bg-alt: #f8fafc;
  --header-bg: #ffffff;
  --header-text: #1f2933;
  --header-image: url('../images/Logos/banner2_light.png');
  --footer-bg: #e8f0f8;
  --footer-text: #1f2933;
  --text-primary: #1f2933;
  --text-muted: #52606d;
  --text-subtle: #697586;
  --text-inverse: #ffffff;
  --border-color: #d8e2ee;
  --shadow-color: rgba(15, 23, 42, 0.14);
  --shadow-color-strong: rgba(15, 23, 42, 0.24);
  --accent: #2878b8;
  --accent-hover: #1f669d;
  --success: #198f55;
  --success-hover: #137944;
  --danger: #c0392b;
  --warning: #a86614;
  --input-bg: #ffffff;
  --input-text: #1f2933;
  --input-border: #c8d2df;
  --image-placeholder: #e3e8ef;
  --model-viewer-bg: #eef3f8;
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --page-bg: #242526;
  --surface-bg: #242526;
  --surface-bg-alt: #1e1e1f;
  --header-bg: #242526;
  --header-text: #ffffff;
  --header-image: url('../images/Logos/banner2.png');
  --footer-bg: #34495e;
  --footer-text: #ffffff;
  --text-primary: #ffffff;
  --text-muted: #a3a3a3;
  --text-subtle: #cccccc;
  --text-inverse: #ffffff;
  --border-color: #3a3b3c;
  --shadow-color: #3a3b3c;
  --shadow-color-strong: #57585a;
  --accent: #3498db;
  --accent-hover: #2980b9;
  --success: #2ecc71;
  --success-hover: #27ae60;
  --danger: #e74c3c;
  --warning: #f39c12;
  --input-bg: #1e1e1f;
  --input-text: #ffffff;
  --input-border: #57585a;
  --image-placeholder: #1e1e1f;
  --model-viewer-bg: #1e1e1f;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--page-bg);
}

a {
  color: var(--accent);
}

/* --- Header --- */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--header-bg);
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
  border-radius: 10px;
  box-shadow: 0 0 20px var(--shadow-color);

  background-image: var(--header-image);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--header-text);
}

.header-top {
  width: 100%;
  display: flex;
  align-items: center;
  padding: 1rem;
}

header h1 {
  margin: auto;
  flex-grow: 1;
  text-align: center;
  font-size: 24px;
  font-weight: 600;
}

.logo-container,
.spacer {
  flex: 1;
  display: flex;
  justify-content: flex-start;
}

.logo {
  width: 150px;
  height: auto;
}

.spacer {
  justify-content: flex-end;
}

/* --- Navigation --- */
nav.nav-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.5rem 0;
}

nav.nav-links a {
  background-color: var(--accent);
  color: var(--text-inverse);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  text-decoration: none;
  font-size: 14px;
}

nav.nav-links a:hover {
  background-color: var(--accent-hover);
}

/* --- Theme Toggle --- */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--header-text);
  font-size: 1.2rem;
  cursor: pointer;
  border-radius: 50%;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin-right: 0.3rem;
  transition: background-color 0.3s;
}

.theme-toggle:hover {
  background-color: var(--surface-bg-alt);
}

.spacer {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* --- Burger Menu --- */
.burger {
  display: none;
  font-size: 2rem;
  background: none;
  border: none;
  color: var(--header-text);
  cursor: pointer;
}

@media (max-width: 768px) {
  .burger {
    display: block;
  }

  nav.nav-links {
    display: none;
    flex-direction: column;
    gap: 0.5rem;
    background-color: var(--surface-bg-alt);
    padding: 1rem;
    border-radius: 8px;
    width: 100%;
  }

  nav.nav-links.active {
    display: flex;
  }

  .logo {
    width: 100px;
  }
}

/* --- Container --- */
.container {
  max-width: 900px;
  margin: 0 auto;
}

/* --- Sections --- */
.welcome-section,
.about-section {
  background-color: var(--surface-bg);
  color: var(--text-primary);
  padding: 1.5rem;
  border-radius: 10px;
  margin-bottom: 2rem;
  box-shadow: 0 0 20px var(--shadow-color);
}

.about-section p {
  text-align: justify;
}

/* --- Footer --- */
footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}