:root {
  --bg: #f9f9f9;
  --text: #777;
  --maxw: 1100px;
  --radius: 16px;
  --shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.9;
}

/* ===== TITLE ===== */
.title-containar {
    display: flex;
    justify-content: center;
}

.title-containar .title-block {
    padding-top: 60px;
    display: flex;
    gap: 14px;
}

.title-containar .title-block .app-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    box-shadow:var(--shadow);
}

.title-containar .title-block .app-title {
    margin: 0;
    font-size: 1.3rem;
    font-weight: 700;
}

.title-containar .title-block .app-subtitle {
    margin: 0;
    font-size: 0.9rem;
}

.title-containar .title-block .rainbow-line {
    height: 2px;
    margin-top: 8px;
    width: 100%;
    background: linear-gradient(
        90deg,
        #ff4d4d,
        #ffd607,
        #52ff63,
        #0bd3ff,
        #7f5dff,
        #ff4df0
    );
    border-radius: 999px;
}

/* ===== CONTENT MAIN ===== */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  margin-top: 20px;
  padding: 10px 16px 60px;
}

section {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 18px;
  margin: 16px 0;
}

section p {
  margin-top: 0;
  font-weight: 300;
  font-size: 15px;
}

section span.howto {
  font-weight: bold;
}

.detail-section {
  margin-top: 40px;
  background: #fff;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}

.detail-section h3 {
  margin: 0 0 16px;
  font-size: 22px;
  font-weight: 700;
}