/* --- Theming and Layout Styles --- */
:root {
    --color-background: #f8f9fa;
    --color-surface: #ffffff;
    --color-text-primary: #212529;
    --color-text-secondary: #6c757d;
    --color-border: #dee2e6;
    --color-primary: #007bff;
    --color-primary-hover: #0056b3;
    --transition-speed: 0.3s;
    --navbar-height: 70px;
    --navbar-padding: 1.5rem;
    --container-width: 1140px;
    --border-radius: 8px;
    --font-family-sans-serif: system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
    --color-background: #121212;
    --color-surface: #1e1e1e;
    --color-text-primary: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-border: #333333;
    --color-primary: #3391ff;
    --color-primary-hover: #5ca8ff;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font-family-sans-serif);
    font-size: 1rem;
    line-height: 1.6;
    background-color: var(--color-background);
    color: var(--color-text-primary);
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.content { height: 200vh; padding: 100px var(--navbar-padding); text-align: center; }
ul { list-style: none; margin: 0; padding: 0; }
a { text-decoration: none; color: var(--color-primary); }
a:hover { color: var(--color-primary-hover); }

/* --- Navbar Styles --- */
.navbar {
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    position: sticky; top: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
    z-index: 1000;
}

.navbar__container {
    display: flex; justify-content: space-between; align-items: center;
    width: 100%; max-width: var(--container-width);
    margin: 0 auto; padding: 0 var(--navbar-padding);
}

.navbar__brand {
    font-size: 1.5rem; font-weight: bold; color: var(--color-text-primary);
    text-decoration: none; transition: color var(--transition-speed) ease;
}

.navbar__toggle {
    display: block; border: none; background: transparent; cursor: pointer; padding: 0.5rem;
}

.navbar__toggle .bar {
    display: block; width: 25px; height: 3px; margin: 5px auto;
    background-color: var(--color-text-primary);
    transition: all var(--transition-speed) ease;
}

.navbar__toggle.is-active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.navbar__toggle.is-active .bar:nth-child(2) { opacity: 0; }
.navbar__toggle.is-active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.navbar__menu {
    display: none; flex-direction: column; width: 100%;
    position: absolute; top: var(--navbar-height); left: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 999;
}

.navbar__menu.is-active { display: flex; }
.navbar__item { text-align: center; border-top: 1px solid var(--color-border); }
.navbar__link { display: block; padding: 1.25rem; font-weight: bold; }

:is(.navbar__toggle, .navbar__link, #theme-toggle):focus-visible {
    outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: 4px;
}

/* --- Theme Toggle Button Styles --- */
#theme-toggle {
    background: none; border: none; cursor: pointer;
    padding: 0.5rem; border-radius: 50%; display: flex; align-items: center;
}

.theme-icon {
    width: 24px; height: 24px; color: var(--color-text-secondary);
    transition: color var(--transition-speed) ease, transform var(--transition-speed) ease;
}
#theme-toggle:hover .theme-icon, #theme-toggle:focus .theme-icon {
    color: var(--color-text-primary); transform: rotate(15deg);
}

.sun-icon { display: none; }
.moon-icon { display: block; }

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* --- Desktop Styles --- */
@media (min-width: 768px) {
    .navbar__toggle { display: none; }
    .navbar__menu {
        display: flex; flex-direction: row; align-items: center; position: static;
        width: auto; background-color: transparent; border: none;
    }
    .navbar__list { display: flex; align-items: center; gap: 1rem; }
    .navbar__item { border-top: none; }
    .navbar__link { padding: 0.5rem; }
    .navbar__item:last-child { margin-left: 1.5rem; }
}

/* --- 3D Model Viewer Styles --- */
.models {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.sketchfab-embed-wrapper {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: box-shadow var(--transition-speed);
}

.sketchfab-embed-wrapper:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.sketchfab-embed-wrapper iframe {
    width: 100%;
    height: 300px;
    border: none;
    display: block;
}

.sketchfab-embed-wrapper p {
    font-size: 13px;
    font-weight: normal;
    margin: 8px;
    color: var(--color-text-secondary);
}

.sketchfab-embed-wrapper a {
    font-weight: bold;
    color: var(--color-primary);
}

.sketchfab-embed-wrapper a:hover {
    color: var(--color-primary-hover);
}

/* --- Info Icon Styles --- */
.navbar__brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.info-icon {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color var(--transition-speed);
}
.info-icon:hover {
  color: var(--color-text-primary);
}

/* Modal styling */
.modal {
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  margin: 10% auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
}

.close {
  float: right;
  font-size: 1.5rem;
  font-weight: bold;
  cursor: pointer;
}

.hidden {
  display: none;
}