/* ===================================
   COLOR VARIABLES
   =================================== */

:root {
  color-scheme: dark;

  --background: #141619;
  --surface: #141619;
  --card: #1d2228;

  --text: #f5f5f5;
  --muted: #a8adb5;

  --border: #292e34;
  --accent: #ff2020;
  --accent-hover: #c90000;

  --nav-background: rgba(20, 22, 25, 0.88);
  --shadow: rgba(0, 0, 0, 0.35);
}

body.light-mode {
  color-scheme: light;

  --background: #ffffff;
  --surface: #ffffff;
  --card: #f5f5f5;

  --text: #111111;
  --muted: #555555;

  --border: #d8d8d8;
  --accent: #d90000;
  --accent-hover: #a90000;

  --nav-background: rgba(255, 255, 255, 0.9);
  --shadow: rgba(0, 0, 0, 0.12);
}

/* ===================================
   PAGE THEME
   =================================== */

body {
  background-color: var(--background);
  color: var(--text);

  transition:
    background-color 0.35s ease,
    color 0.35s ease;
}

.home,
.about,
.education-section,
.projects-section,
.site-footer {
  background-color: var(--surface);
  color: var(--text);

  transition:
    background-color 0.35s ease,
    color 0.35s ease,
    border-color 0.35s ease;
}

/*
  Do not add .navbar or .container here.

  Leapheng.css controls the connected and separated
  navbar backgrounds.
*/

/* ===================================
   TEXT COLORS
   =================================== */

.name,
.welcome,
.skill-title,
.skill-headline,
.education-heading h2,
.education-card h3,
.nav_link {
  color: var(--text);
}

.description,
.skill-description,
.education-heading > p:last-child,
.education-card p,
.footer-content p,
.footer-bottom {
  color: var(--muted);
}

.skill,
.skill span,
.section-label,
.education-year {
  color: var(--accent);
}

/* ===================================
   CARDS
   =================================== */

.skill-set,
.education-card {
  background-color: var(--card);
  border-color: var(--border);

  transition:
    background-color 0.35s ease,
    color 0.35s ease,
    border-color 0.35s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

/* ===================================
   NAVIGATION THEME
   =================================== */

.nav_link {
  color: var(--text);
}

.nav_link:hover {
  color: var(--accent);
}

/* Red loading line under navigation links */

.nav_link::after {
  background-color: var(--accent);
}

.nav_link:hover::after,
.nav_link:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav_button {
  background-color: var(--accent);
  color: #ffffff;
}

.nav_button:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
}

.navbar_toggle .bar {
  background-color: var(--text);
}

/* Logo background */

#nav_logo {
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background-color: #111315;
  object-fit: contain;

  transition:
    transform 0.3s ease,
    border-color 0.35s ease,
    background-color 0.35s ease;
}

body.light-mode #nav_logo {
  background-color: #111111;
  border-color: #222222;
}

/* ===================================
   FLOATING THEME BUTTON
   =================================== */

#theme-toggle {
  position: fixed;
  right: 25px;
  bottom: 25px;
  z-index: 2000;

  display: grid;
  place-items: center;

  width: 54px;
  height: 54px;
  margin: 0;
  padding: 0;

  border: 1px solid var(--border);
  border-radius: 50%;

  background-color: var(--card);
  color: var(--text);

  cursor: pointer;
  font-size: 22px;
  line-height: 1;

  box-shadow: 0 8px 20px var(--shadow);

  transition:
    background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

#theme-toggle:hover {
  background-color: var(--accent);
  color: #ffffff;
  transform: translateY(-5px) rotate(15deg);
  box-shadow: 0 12px 25px rgba(255, 32, 32, 0.35);
}

#theme-toggle:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

/* ===================================
   NAME TYPING ANIMATION
   =================================== */

#typing-name {
  display: block;
  width: max-content;
  min-width: 0;
  min-height: 1.05em;
  padding-right: 5px;
  color: var(--accent) !important;
  border-right: 4px solid var(--accent);

  animation: typing-cursor 0.75s step-end infinite;
}

@keyframes typing-cursor {
  0%,
  100% {
    border-color: var(--accent);
  }

  50% {
    border-color: transparent;
  }
}

/* ===================================
   FOOTER
   =================================== */

.site-footer {
  width: 100%;
  margin-top: 80px;
  padding: 55px 8% 25px;

  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;

  padding-bottom: 35px;
}

.footer-content h2 {
  margin-bottom: 10px;

  color: var(--accent);
  font-size: 26px;
}

.footer-content p,
.footer-bottom {
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 25px;
}

.footer-links a {
  color: var(--text);
  font-size: 14px;
  text-decoration: none;

  transition: color 0.3s ease;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;

  padding-top: 22px;
  border-top: 1px solid var(--border);

  font-size: 12px;
}

/* ===================================
   MOBILE
   =================================== */

@media (max-width: 600px) {
  #theme-toggle {
    right: 18px;
    bottom: 18px;

    width: 48px;
    height: 48px;

    font-size: 19px;
  }

  .footer-content,
  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 18px;
  }
}

/* Center typing name on phones */

/* Center typing name on phones */

@media (max-width: 550px) {
  .name {
    display: flex;
    flex-direction: column;
    align-items: center;

    width: 100%;
    text-align: center;
  }

  #typing-name {
    display: block;

    width: max-content;
    max-width: 100%;
    min-width: 0;

    margin: 5px 0 0;

    text-align: center;
  }
}

/* ===================================
   REDUCED MOTION
   =================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  #typing-name {
    width: max-content;
    max-width: 100%;
    border-right: none;
  }
}