body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* Color themes */
:root {
  --bg: #f5f7fa;
  --text: #333;
  --card: #fff;
  --brand: #D4AF37;
  /* Classic Gold */
  --brand-dark: #B8932D;
  /* Deep Gold */
  --brand-light: #E0B84A;
  /* Bright Gold */
  --brand-earthy: #C9A038;
  /* Earthy Gold */
  --shadow: rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --text: #eee;
    --card: #232323;
    --shadow: rgba(255, 255, 255, 0.08);
  }
}

#language-selector {
  text-align: center;
  padding: 15px;
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg);
  box-shadow: 0 2px 10px var(--shadow);
  backdrop-filter: blur(10px);
  /* Modern glass effect */
}

#language-selector button {
  padding: 10px 20px;
  margin: 5px;
  border: none;
  background: var(--brand);
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.25s;
}

#language-selector button:hover {
  background: var(--brand-dark);
}

#language-selector .back-btn {
  background: #6c757d;
  margin-right: 15px;
}

#language-selector .back-btn:hover {
  background: #5a6268;
}

main {
  max-width: 800px;
  margin: auto;
  padding: 20px;
  text-align: center;
}

/* Flowchart always vertical */
.flowchart {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.step-card {
  perspective: 1000px;
  width: 100%;
  max-width: 650px;
  position: relative;
}

/* Vertical arrows */
.step-card::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -40px;
  transform: translateX(-50%);
  width: 25px;
  height: 40px;
  border-left: 3px solid var(--brand);
  border-bottom: 3px solid var(--brand);
  border-radius: 0 0 0 12px;
}

.step-card:last-child::after {
  display: none;
}

/* Step */
.step {
  width: 100%;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 4px 12px var(--shadow);
  border-top: 6px solid var(--brand);
  position: relative;
  min-height: 220px;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.6s;
}

/* Number badge */
.badge {
  position: absolute;
  top: -18px;
  left: -18px;
  background: var(--brand);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  box-shadow: 0 2px 6px var(--shadow);
}

/* Accordion behavior */
.front,
.back {
  padding: 20px;
  word-wrap: break-word;
  white-space: normal;
}

.back {
  display: none;
}

.accordion.open .front {
  display: none;
}

.accordion.open .back {
  display: block;
}

/* Hover glow for desktops */
@media (hover: hover) {
  .step-card:hover .step {
    box-shadow: 0 8px 24px rgba(0, 119, 204, 0.16);
    transform: translateY(-6px);
  }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Icon style */
.icon {
  font-size: 56px;
  color: var(--brand);
  margin-bottom: 12px;
}

/* Progress bar */
.progress-bar {
  position: fixed;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 50vh;
  background: #cbd6e8;
  border-radius: 6px;
  z-index: 9999;
}

.progress {
  width: 100%;
  background: var(--brand);
  height: 0;
  border-radius: 6px;
  transition: height 0.2s ease;
}

/* Responsive */
@media (max-width: 480px) {
  .icon {
    font-size: 48px;
  }

  .step {
    min-height: 260px;
  }

  main {
    padding: 12px;
  }

  .badge {
    width: 32px;
    height: 32px;
    top: -16px;
    left: -16px;
  }

  .progress-bar {
    left: 6px;
    height: 40vh;
  }
}