/* Reset and box-sizing */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid #e5e7eb;
}

/* Root colors */
:root {
  --color-primary: #0f172a;
  --color-secondary: #334155;
  --color-accent: #7c3aed;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-error: #dc2626;
}

/* Base HTML */
html {
  scroll-behavior: smooth;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  line-height: 1.6;
}

/* Body */
body {
  background-color: #ffffff;
  color: var(--color-primary);
  font-size: 16px;
  line-height: 1.6;
}

/* Headings */
h1 {
  color: var(--color-primary);
  font-size: 48px;
  line-height: 1.1;
  font-family: 'Shrikhand', 'Inter', system-ui, Arial, sans-serif;
  letter-spacing: -0.025em;
  text-align: center;
}

h2 {
  color: #111827;
  font-size: 32px;
  line-height: 1.25;
  font-family: 'Inter', system-ui, Arial, sans-serif;
}

/* Links and buttons */
a {
  color: var(--color-accent);
  text-decoration: none;
}

button {
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: 0.5rem;
  cursor: pointer;
}

/* Containers */
.background-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: linear-gradient(to bottom right, #00ffff, #1f1f1f);
}

.content-card {
  width: 100%;
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.card-surface {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  border-radius: 1rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  padding: 3.5rem;
  transition: all 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.header-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.subtle-divider {
  width: 5rem;
  height: 1px;
  background-color: #e2e8f0;
}

.body-copy {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  color: #334155;
}

.subtitle-line-1,
.subtitle-line-2,
.placeholder-line {
  font-size: 1.125rem;
  line-height: 1.75rem;
}

.footer-hint {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
}

.hint-text {
  font-size: 0.875rem;
  line-height: 1.25rem;
  color: #64748b;
  text-align: center;
}

/* Responsive */
@media (max-width: 992px) {
  h1 {
    font-size: 40px;
  }

  h2 {
    font-size: 28px;
  }

  .card-surface {
    padding: 3rem 2.5rem;
  }

  .subtitle-line-1,
  .subtitle-line-2,
  .placeholder-line {
    font-size: 1rem;
    line-height: 1.5rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 32px;
  }

  h2 {
    font-size: 24px;
  }

  .card-surface {
    padding: 2.5rem 2rem;
  }

  .subtitle-line-1,
  .subtitle-line-2,
  .placeholder-line {
    font-size: 1rem;
    line-height: 1.5rem;
  }
}