:root {
  --primary-green:#50c878;
  --primary-silver:#c0c0c0;
  --primary-dark:#0a2540;
  --background-light:#f5f7fa;
  --background-dark:#0f121a;
  --accent-light:#a6deb9;
  --accent-dark:#3e8e41;

  --font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --border-radius:8px;
  --transition-speed:.25s ease-in-out;
  --box-shadow:0 2px 8px rgba(80,200,120,.3);

  --max-width:1120px;
  --gutter:20px;

  --heading-color:var(--primary-green);
  --text-color:var(--primary-dark);
  --text-muted:#666
}

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

body {
  margin:0;
  font-family:var(--font-family);
  background:var(--background-light);
  color:var(--text-color);
  line-height:1.6;
  min-height:100vh;
  transition:background var(--transition-speed),color var(--transition-speed)
}

.dark-theme {
  background:var(--background-dark);
  color:var(--primary-silver)
}

a {
  color:var(--primary-green);
  text-decoration:none;
  transition:color var(--transition-speed)
}

a:hover,a:focus {
  color:var(--accent-dark);
  outline:none;
  text-decoration:underline
}

.container {
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 var(--gutter)
}

header {
  background:var(--primary-green);
  color:#fff;
  padding:1.8rem var(--gutter);
  text-align:center;
  box-shadow:var(--box-shadow);
  user-select:none
}

header h1 {
  margin:0;
  font-weight:700;
  font-size:2.8rem;
  text-transform:uppercase;
  letter-spacing:2px;
  line-height:1.1
}

header p {
  font-weight:400;
  font-size:1.2rem;
  opacity:.85;
  margin-top:.4rem
}

.nav-menu {
  list-style:none;
  padding:0;
  margin-top:1rem;
  display:flex;
  gap:15px;
  justify-content:center
}

.nav-menu li a {
  color:#fff;
  font-weight:600;
  padding:6px 12px;
  border-radius:4px;
  transition:background-color .3s ease
}

.nav-menu li a:hover,
.nav-menu li a[aria-current="page"] {
  background-color:var(--accent-dark);
  outline:none;
  text-decoration:none
}

section {
  background:#fff;
  border-radius:var(--border-radius);
  box-shadow:var(--box-shadow);
  margin:2rem 0;
  transition:background-color var(--transition-speed),color var(--transition-speed);
  padding:1.5rem 2rem;
  color:var(--primary-dark)
}

.dark-theme section {
  background:#1a2538;
  color:var(--primary-silver)
}

.section-header {
  display:flex;
  justify-content:space-between;
  align-items:center;
  cursor:pointer;
  user-select:none;
  background:var(--primary-green);
  padding:12px 18px;
  border-radius:var(--border-radius) var(--border-radius) 0 0;
  color:#fff;
  box-shadow:var(--box-shadow);
  transition:background-color .3s ease,transform .3s ease;
  font-weight:600
}

.section-header:hover {
  transform:scale(1.03);
  background-color:var(--accent-dark)
}

.section-header:focus {
  outline:2px dashed #fff;
  outline-offset:4px
}

.see-more {
  font-size:0.9rem;
  font-weight:500;
  color:#dadedfdd;
  transition:color .3s ease
}

.section-header:hover .see-more {
  color:#a8e6a8dd
}

.section-content {
  background:var(--background-light);
  border-radius:0 0 var(--border-radius) var(--border-radius);
  padding:1rem 1.2rem 1.5rem 1.2rem;
  display:none;
  line-height:1.5;
  box-shadow:inset 0 1px 3px #eee;
  transition:max-height .35s ease;
  color:var(--primary-dark)
}

.section-content.active {
  display:block
}

button,
a.btn {
  background:var(--primary-green);
  color:#fff;
  border:none;
  border-radius:6px;
  padding:.7rem 1.4rem;
  font-size:1rem;
  cursor:pointer;
  box-shadow:var(--box-shadow);
  transition:background-color var(--transition-speed),transform .2s ease;
  text-align:center;
  display:inline-block;
  user-select:none
}

button:hover,
a.btn:hover,
button:focus,
a.btn:focus {
  background-color:var(--accent-dark);
  outline:none;
  transform:scale(1.07)
}

form input[type="text"],
form input[type="email"],
form textarea {
  width:100%;
  padding:.7rem 1rem;
  margin-bottom:1rem;
  border:2px solid var(--primary-green);
  border-radius:5px;
  font-size:1rem;
  color:var(--text-color);
  background:#fff;
  transition:border-color var(--transition-speed);
  font-family:var(--font-family)
}

.dark-theme form input[type="text"],
.dark-theme form input[type="email"],
.dark-theme form textarea {
  background:#2a3b5c;
  border-color:var(--accent-light);
  color:var(--primary-silver)
}

form input[type="text"]:focus,
form input[type="email"]:focus,
form textarea:focus {
  outline:none;
  border-color:var(--accent-dark)
}

form textarea {
  resize:vertical;
  min-height:120px
}

footer {
  text-align:center;
  padding:1.4rem 0;
  background:var(--primary-green);
  color:#fff;
  user-select:none;
  font-weight:600;
  font-size:1rem;
  box-shadow:var(--box-shadow)
}

.theme-toggle-box {
  position:fixed;
  top:16px;
  left:16px;
  background:var(--primary-green);
  color:#fff;
  border-radius:6px;
  padding:6px 12px;
  box-shadow:var(--box-shadow);
  cursor:pointer;
  user-select:none;
  z-index:1000;
  font-family:var(--font-family);
  display:flex;
  align-items:center;
  gap:8px;
  transition:background-color var(--transition-speed)
}

.theme-toggle-box:hover {
  background-color:var(--accent-dark)
}

#accentPicker {
  width:26px;
  height:22px;
  border:none;
  cursor:pointer;
  border-radius:4px;
  box-shadow:0 0 8px var(--primary-green);
  outline-offset:2px
}

@media (max-width:768px) {
  .container {
    padding:0 12px
  }
  header h1 {
    font-size:2rem
  }
  section {
    padding:1.5rem 1.6rem
  }
  .section-header h2 {
    font-size:1.5rem
  }
  button,
  a.btn {
    font-size:0.9rem;
    padding:.6rem 1.1rem
  }
  .nav-menu {
    flex-direction:column;
    gap:8px
  }
}

body.user-is-tabbing :focus-visible {
  outline:2px dashed var(--primary-green);
  outline-offset:3px;
  transition:outline-offset .2s ease
}

.profile-card:hover,
.product-card:hover,
button:hover,
a.btn:hover {
  transform:scale(1.06);
  transition:transform .2s ease
}