/* ===== Exercise 7: JavaScript & jQuery ===== */

:root{
  --bg: #fafaf9;
  --text: #1c1917;
  --muted: #78716c;
  --accent: #7f1d1d;
  --line: #e7e5e4;
  --dark: #111;
  --white: #fff;
}

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'DM Mono', monospace;
}

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

/* ===== NAV ===== */
.site-nav{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  align-items: center;
  padding: 20px 40px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  z-index: 9999;
}

.nav-name{
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
}

.nav-links{
  display: flex;
  align-items: center;
  margin-left: auto;
  gap: 26px;
}

.nav-links a{
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* Hamburger button - hidden on desktop */
.hamburger{
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}

.hamburger span{
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Mobile dropdown */
.mobile-menu{
  display: none;
  position: fixed;
  top: 62px;
  left: 0;
  width: 100%;
  background: var(--dark);
  padding: 20px 40px;
  z-index: 9998;
  flex-direction: column;
  gap: 16px;
}

.mobile-menu.open{
  display: flex;
}

.mobile-menu a{
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--white);
  text-decoration: none;
  transition: color 0.3s ease;
}

.mobile-menu a:hover{
  color: var(--accent);
}

/* ===== PAGE LAYOUT ===== */
.page-title{
  text-align: center;
  padding: 120px 20px 40px;
}

.page-title h1{
  font-family: 'Bitcount Single', sans-serif;
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.page-title p{
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.demos{
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px 80px;
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.demo{
  border-top: 1px solid var(--line);
  padding-top: 40px;
}

.demo h2{
  font-family: 'Bitcount Single', sans-serif;
  font-size: 1.6rem;
  color: var(--text);
  margin-bottom: 6px;
}

.demo .label{
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.demo-area{
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  background: var(--white);
  border: 1px solid var(--line);
  flex-wrap: wrap;
  gap: 20px;
  padding: 30px;
}

/* ===== 1. Page Load Fade-In ===== */
.fade-item{
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-item.visible{
  opacity: 1;
  transform: translateY(0);
}

/* ===== 2. Accordion ===== */
.accordion{
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
}

.accordion-item{
  border: 1px solid var(--line);
}

.accordion-header{
  width: 100%;
  padding: 16px 20px;
  background: var(--bg);
  border: none;
  text-align: left;
  font-family: 'DM Mono', monospace;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: color 0.3s ease;
}

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

.accordion-header .arrow{
  transition: transform 0.3s ease;
}

.accordion-item.open .accordion-header .arrow{
  transform: rotate(180deg);
}

.accordion-body{
  display: none;
  padding: 0 20px 16px;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

.accordion-item.open .accordion-body{
  display: block;
}

/* ===== 3. Counter ===== */
.counter-display{
  font-family: 'Bitcount Single', sans-serif;
  font-size: 5rem;
  color: var(--accent);
}

.counter-btn{
  padding: 10px 24px;
  font-family: 'DM Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--text);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.3s ease, color 0.3s ease;
}

.counter-btn:hover{
  background: var(--dark);
  color: var(--white);
}

/* ===== 4. Image Carousel ===== */
.carousel{
  width: 100%;
  position: relative;
  overflow: hidden;
}

.carousel-track{
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide{
  min-width: 100%;
  aspect-ratio: 16 / 7;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Bitcount Single', sans-serif;
  font-size: 2rem;
  color: var(--white);
}

.carousel-slide:nth-child(1){ background: var(--accent); }
.carousel-slide:nth-child(2){ background: var(--dark); }
.carousel-slide:nth-child(3){ background: var(--muted); }
.carousel-slide:nth-child(4){ background: #57534e; }

.carousel-controls{
  display: flex;
  justify-content: center;
  gap: 12px;
  padding: 16px 0 0;
}

.carousel-btn{
  padding: 8px 20px;
  font-family: 'DM Mono', monospace;
  font-size: 0.8rem;
  border: 1px solid var(--line);
  background: var(--bg);
  cursor: pointer;
  transition: background 0.3s ease;
}

.carousel-btn:hover{
  background: var(--line);
}

/* ===== 5. Toggle Dark/Light ===== */
.theme-toggle-btn{
  padding: 14px 32px;
  font-family: 'DM Mono', monospace;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 2px solid var(--text);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: all 0.4s ease;
}

body.dark-mode .theme-toggle-btn{
  border-color: var(--white);
  color: var(--white);
}

/* Dark mode overrides */
body.dark-mode{
  background: var(--dark);
  color: var(--white);
}

body.dark-mode .site-nav{
  background: var(--dark);
  border-bottom-color: #333;
}

body.dark-mode .nav-name,
body.dark-mode .nav-links a{
  color: var(--white);
}

body.dark-mode .demo-area{
  background: #1a1a1a;
  border-color: #333;
}

body.dark-mode .accordion-header{
  background: #1a1a1a;
  color: var(--white);
}

body.dark-mode .demo h2{
  color: var(--white);
}

body.dark-mode .demo{
  border-top-color: #333;
}

body.dark-mode .carousel-btn{
  background: #1a1a1a;
  border-color: #333;
  color: var(--white);
}

body.dark-mode .counter-btn{
  border-color: var(--white);
  color: var(--white);
}

body.dark-mode .counter-btn:hover{
  background: var(--white);
  color: var(--dark);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px){
  .nav-links{
    display: none;
  }
  .hamburger{
    display: block;
  }
}

@media (max-width: 480px){
  .page-title h1{
    font-size: 3rem;
  }
}