/* Ý 21 – Lời chào lần đầu và trang Hướng dẫn sử dụng. Hiệu ứng chỉ đổi transform và opacity. */
.fw { position: fixed; inset: 0; z-index: 1080; display: flex; align-items: center; justify-content: center; padding: 16px; }
.fw[hidden] { display: none; }
.fw-backdrop { position: absolute; inset: 0; background: rgba(74, 52, 38, .42); animation: fw-fade .35s ease both; }
.fw-card { position: relative; width: min(440px, 100%); max-height: calc(100vh - 32px); overflow-y: auto; text-align: center;
  background: var(--fa-surface); border: 1px solid var(--fa-line); border-radius: 26px; padding: 2rem 1.5rem 1.1rem;
  box-shadow: 0 30px 70px -24px rgba(120, 70, 20, .65); animation: fw-rise .55s var(--fa-ease) both; }
.fw-card::before { content: ''; position: absolute; inset: 0 0 auto; height: 120px; border-radius: 26px 26px 0 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 0%, rgba(255, 206, 110, .55), rgba(255, 248, 236, 0) 70%); }
.fw.is-closing .fw-backdrop, .fw.is-closing .fw-card { opacity: 0; transition: opacity .25s; }
.fw-sun { position: relative; width: 72px; height: 72px; margin: 0 auto .7rem; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--fa-honey), var(--fa-amber)); color: #fff; box-shadow: 0 12px 26px -10px rgba(232, 131, 58, .9); }
.fw-sun .bi-sun-fill { font-size: 2.1rem; animation: fw-spin 14s linear infinite; }
.fw-sun .bi-heart-fill { position: absolute; right: 2px; bottom: 4px; font-size: 1.1rem; color: var(--fa-coral);
  background: #fff; border-radius: 50%; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center;
  animation: fw-beat 1.6s ease-in-out infinite; }
.fw-kicker { position: relative; margin: 0 0 .2rem; font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 700; color: var(--fa-amber-dark); }
.fw-title { position: relative; font-family: 'Playfair Display', serif; font-size: 1.55rem; line-height: 1.25; margin: 0 0 .5rem; color: var(--fa-ink); }
.fw-title span { color: var(--fa-amber-dark); }
.fw-text { color: var(--fa-muted); margin: 0 0 1.1rem; }
.fw-main { margin-bottom: 1rem; }
.fw-where { display: flex; gap: .7rem; align-items: flex-start; text-align: left; background: var(--fa-soft); border-radius: 16px; padding: .75rem .85rem; margin-bottom: .7rem; }
.fw-where p { margin: 0; font-size: .86rem; color: var(--fa-ink); }
.fw-where-icon { flex: none; width: 36px; height: 36px; border-radius: 12px; background: var(--fa-surface); color: var(--fa-amber); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; }
.fw-foot { margin-top: .9rem; font-size: .82rem; color: var(--fa-muted); }
.fw-foot button { background: none; border: 0; padding: .25rem .2rem; color: var(--fa-muted); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.fw-foot button:hover { color: var(--fa-amber-dark); }

/* Mục "Hướng dẫn sử dụng" trong menu tài khoản được làm sáng khi bấm "Chỉ cho tôi chỗ tải file" */
.fa-dropdown .fw-menu-manual { position: relative; }
.fw-menu-manual .fw-here { display: none; margin-left: .4rem; font-size: .7rem; font-weight: 700; color: #fff; background: var(--fa-amber); border-radius: 999px; padding: .1rem .5rem; }
.fw-menu-manual.fw-spot { background: linear-gradient(135deg, rgba(255, 214, 120, .55), rgba(255, 217, 194, .55)); font-weight: 600; }
.fw-menu-manual.fw-spot .fw-here { display: inline-block; animation: fw-nudge 1s ease-in-out infinite; }
.fw-menu-manual.fw-spot::after { content: ''; position: absolute; inset: 0; border-radius: 10px; border: 2px solid var(--fa-honey); pointer-events: none; animation: fg-pulse 1.4s ease-out infinite; }

/* ---------- Trang Hướng dẫn sử dụng ---------- */
.mn-hero { display: flex; gap: 1.2rem; align-items: center; margin-bottom: 1.5rem; }
.mn-hero-icon { flex: none; width: 76px; height: 76px; border-radius: 24px; display: flex; align-items: center; justify-content: center; font-size: 2.2rem; color: #fff;
  background: linear-gradient(135deg, var(--fa-honey), var(--fa-amber)); box-shadow: var(--fa-shadow); }
.mn-download { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: center; background: var(--fa-surface); border: 1px solid var(--fa-line);
  border-radius: 24px; padding: 1.4rem; box-shadow: var(--fa-shadow); margin-bottom: 2rem; scroll-margin-top: 90px; }
.mn-download h2 { font-size: 1.15rem; font-weight: 700; }
.mn-btns { display: flex; flex-wrap: wrap; gap: .5rem; margin: .9rem 0 .4rem; }
/* Hình minh hoạ menu tài khoản, vẽ bằng HTML/CSS (không cần ảnh) */
.mn-mock { position: relative; background: var(--fa-bg-2); border-radius: 18px; padding: 1rem; font-size: .82rem; }
.mn-mock-bar { display: flex; justify-content: flex-end; align-items: center; gap: .4rem; background: var(--fa-surface); border-radius: 12px; padding: .4rem .6rem; box-shadow: var(--fa-shadow); }
.mn-mock-bar .fa-avatar { width: 26px; height: 26px; font-size: .75rem; }
.mn-mock-menu { margin: .5rem 0 0 auto; width: min(230px, 100%); background: var(--fa-surface); border: 1px solid var(--fa-line); border-radius: 14px; padding: .35rem; box-shadow: var(--fa-shadow-lg); }
.mn-mock-menu div { padding: .3rem .55rem; border-radius: 9px; color: var(--fa-muted); }
.mn-mock-menu div i { margin-right: .35rem; }
.mn-mock-menu .on { position: relative; color: var(--fa-ink); font-weight: 600; background: linear-gradient(135deg, rgba(255, 214, 120, .55), rgba(255, 217, 194, .55)); }
.mn-mock-menu .on::after { content: ''; position: absolute; inset: 0; border-radius: 9px; border: 2px solid var(--fa-honey); animation: fg-pulse 1.6s ease-out infinite; }
.mn-mock-hand { position: absolute; right: 18px; bottom: 6px; font-size: 1.6rem; color: var(--fa-amber); animation: fw-nudge 1.2s ease-in-out infinite; }
.mn-mock-tag { position: absolute; left: 1rem; top: 1rem; font-size: .7rem; font-weight: 700; color: var(--fa-amber-dark); text-transform: uppercase; letter-spacing: .1em; }
.mn-toc { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 1.2rem; }
.mn-toc a { text-decoration: none; font-size: .82rem; background: var(--fa-surface); border: 1px solid var(--fa-line); border-radius: 999px; padding: .25rem .75rem; color: var(--fa-ink); }
.mn-toc a:hover { border-color: var(--fa-honey); color: var(--fa-amber-dark); }
.mn-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.mn-sec { background: var(--fa-surface); border: 1px solid var(--fa-line); border-radius: 20px; padding: 1.1rem 1.2rem; scroll-margin-top: 90px; }
.mn-sec h2 { display: flex; align-items: center; gap: .55rem; font-size: 1.02rem; font-weight: 700; margin-bottom: .6rem; }
.mn-sec h2 .mn-n { flex: none; width: 30px; height: 30px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-size: .85rem;
  background: var(--fa-soft); color: var(--fa-amber-dark); }
.mn-sec ol, .mn-sec ul { padding-left: 1.15rem; margin-bottom: .6rem; font-size: .9rem; }
.mn-sec li { margin-bottom: .25rem; }
.mn-sec .mn-go { font-size: .85rem; font-weight: 600; text-decoration: none; }
.mn-more { text-align: center; margin: 2rem 0 1rem; color: var(--fa-muted); }
@media (max-width: 767px) {
  .mn-download, .mn-list { grid-template-columns: 1fr; }
  .mn-hero { gap: .9rem; } .mn-hero-icon { width: 60px; height: 60px; font-size: 1.7rem; border-radius: 18px; }
  .fw-title { font-size: 1.35rem; }
}

@keyframes fw-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes fw-rise { from { opacity: 0; transform: translateY(26px) scale(.96); } to { opacity: 1; transform: none; } }
@keyframes fw-spin { to { transform: rotate(360deg); } }
@keyframes fw-beat { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.15); } }
@keyframes fw-nudge { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(-5px); } }
@media (prefers-reduced-motion: reduce) {
  .fw-backdrop, .fw-card, .fw-sun i, .fw-menu-manual .fw-here, .fw-menu-manual.fw-spot::after, .mn-mock-menu .on::after, .mn-mock-hand { animation: none !important; }
}