:root {
  color-scheme: light;
  --color-background: #f5f7fb;
  --color-surface: #ffffff;
  --color-text: #172033;
  --color-text-muted: #61708a;
  --color-primary: #4f46e5;
  --color-primary-soft: #eef2ff;
  --color-border: #dce2ec;
  --color-error: #c03546;
  --color-error-soft: #fff1f2;
  --color-success: #087f5b;
  --color-success-soft: #e9fbf4;
  --radius-card: 8px;
  --radius-control: 4px;
  --shadow-card: 0 18px 45px #17203314;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--color-text);
  background: var(--color-background);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  display: grid;
  justify-items: center;
  min-width: 320px;
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
}

button,
input {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

[hidden] {
  display: none;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--color-primary);
  font-weight: bold;
  font-size: 1rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.event-header {
  padding: 46px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);

  .event-title {
    margin-bottom: 14px;
    font-size: 4rem;
    line-height: 1.1;
    letter-spacing: -2px;
  }

  .event-lead {
    margin-bottom: 28px;
    color: var(--color-text-muted);
    font-size: 1rem;
  }

  .event-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-control);
    background: var(--color-background);
    list-style: none;

    li {
      font-weight: bold;
      font-size: 1rem;
    }
  }
}

.section-heading {
  margin-bottom: 10px;
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -1px;
}

.section-lead {
  max-width: 680px;
  margin-bottom: 24px;
  color: var(--color-text-muted);
}

.plans {
  display: grid;
  list-style: none;

  .plan-card {
    min-width: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);

    .plan-card__label {
      display: inline-block;
      margin-bottom: 12px;
      color: var(--color-primary);
      font-weight: bold;
      font-size: 1rem;
      letter-spacing: 2px;
    }

    h3 {
      margin-bottom: 10px;
      font-size: 1.5rem;
    }

    p {
      margin-bottom: 20px;
      color: var(--color-text-muted);
    }
  }
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 2px solid transparent;
  border-radius: var(--radius-control);
  background: var(--color-primary);
  color: #ffffff;
  font-weight: bold;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 200ms, color 200ms;

  &:hover {
    border-color: var(--color-primary);
    background: var(--color-surface);
    color: var(--color-primary);
  }
}

.registration {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);

  .form-grid {
    display: grid;
    gap: 20px;

    .field {
      label {
        display: grid;
        grid-template-columns: max-content max-content;
        column-gap: 6px;
        margin-bottom: 7px;
        font-weight: bold;

        .required {
          color: var(--color-error);
          font-size: 1rem;
        }
      }

      input {
        display: block;
        width: 100%;
        height: 50px;
        padding: 0 14px;
        border: 1px solid #b9c3d3;
        border-radius: var(--radius-control);
        background: var(--color-surface);
        color: var(--color-text);

        &:focus {
          border-color: var(--color-primary);
          outline: 3px solid var(--color-primary-soft);
          outline-offset: 0;
        }
      }

      .field-error {
        min-height: 24px;
        padding-top: 6px;
        color: var(--color-error);
        font-weight: bold;
        font-size: 1rem;
      }
    }
  }
}

.success-message {
  padding: 28px;
  border: 1px solid var(--color-success);
  border-radius: 8px;
  background: var(--color-success-soft);
  color: var(--color-success);
}