/* Reset and base styles */
:root {
  --color-bg-light: #f7f8fa;
  --color-bg-dark: #181a1b;
  --color-text-light: #222;
  --color-text-dark: #f7f8fa;
  --color-primary: #4f8cff;
  --color-accent: #ffb347;
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  --font-main: 'Inter', 'Segoe UI', Arial, sans-serif;
}

body {
  margin: 0;
  font-family: var(--font-main);
  background: var(--color-bg-light);
  color: var(--color-text-light);
  transition: background var(--transition), color var(--transition);
}

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

header.hero {
  padding: 2.5rem 1rem 2rem 1rem;
  text-align: center;
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff;
  border-radius: 0 0 2rem 2rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  position: relative;
  animation: fadeIn 1s;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.hero .description {
  font-size: 1.15rem;
  margin-bottom: 1.5rem;
  opacity: 0.95;
}

#age-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

#age-form label {
  font-weight: 500;
}

#age-form input[type="date"] {
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid #ccc;
  font-size: 1rem;
  transition: border var(--transition);
}

#age-form input[type="date"]:focus {
  border-color: var(--color-primary);
  outline: none;
}

#age-form button {
  padding: 0.6rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(79,140,255,0.12);
  transition: background var(--transition), transform var(--transition);
}

#age-form button:hover {
  background: var(--color-accent);
  transform: translateY(-2px) scale(1.04);
}

.result {
  font-size: 1.25rem;
  font-weight: 500;
  margin-top: 0.5rem;
  min-height: 2.2rem;
  color: var(--color-text-dark);
  transition: color var(--transition);
}

body.dark-mode .result {
  color: #ffd580;
}

#theme-toggle {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: 50%;
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  transition: background var(--transition), box-shadow var(--transition);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

#theme-toggle:hover {
  background: rgba(255,255,255,0.35);
}

body.dark-mode #theme-toggle {
  background: rgba(24,26,27,0.35);
}

main {
  padding: 2rem 1rem;
  max-width: 700px;
  margin: 0 auto;
}

.faq h2 {
  font-size: 2rem;
  margin-bottom: 1.2rem;
  text-align: center;
}

.accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.accordion-item {
  background: var(--color-bg-light);
  border-radius: 0.75rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  overflow: hidden;
  transition: background var(--transition);
}

body.dark-mode .accordion-item {
  background: #232527;
}

.accordion-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 1rem;
  cursor: pointer;
  color: var(--color-primary);
  transition: color var(--transition), background var(--transition);
}

.accordion-question:hover {
  background: rgba(79,140,255,0.08);
}

body.dark-mode .accordion-question {
  color: #ffd580;
}

.accordion-answer {
  max-height: 0;
  overflow: hidden;
  background: none;
  color: var(--color-text-light);
  padding: 0 1rem;
  font-size: 1rem;
  transition: max-height var(--transition), padding var(--transition), opacity var(--transition);
  opacity: 0;
}

body.dark-mode .accordion-answer {
  color: var(--color-text-dark);
}

.accordion-item.active .accordion-answer {
  max-height: 200px;
  padding: 1rem;
  opacity: 1;
}

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 1rem;
  color: #888;
  background: none;
}

@media (max-width: 600px) {
  header.hero {
    padding: 1.5rem 0.5rem 1.2rem 0.5rem;
    border-radius: 0 0 1.2rem 1.2rem;
  }
  .hero h1 {
    font-size: 1.5rem;
  }
  main {
    padding: 1rem 0.5rem;
  }
  .faq h2 {
    font-size: 1.3rem;
  }
}