/* ═══════════════════════════════════════════════
   Components — Nav, Buttons, Cards, FAQ, Footer
   ═══════════════════════════════════════════════ */

/* ─── Nav ─── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 9999;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  background: rgba(5,5,5,0.6);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 0.82rem;
  font-weight: 500;
  transition: background 0.5s, border-color 0.5s;
}
.nav.scrolled {
  background: rgba(5,5,5,0.92);
  border-bottom-color: rgba(255,255,255,0.08);
}
.nav-logo {
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: -0.02em;
  color: #fff;
}
.nav a:not(.nav-logo) {
  color: var(--text3);
  transition: color 0.25s;
  position: relative;
}
.nav a:not(.nav-logo)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--violet);
  transition: width 0.3s var(--ease);
}
.nav a:not(.nav-logo):hover { color: var(--text); }
.nav a:not(.nav-logo):hover::after { width: 100%; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-pill);
  font-size: 0.92rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(255,255,255,0.15), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn:hover::before { opacity: 1; }

.btn-primary {
  background: var(--gradient);
  color: #000;
  font-weight: 600;
  box-shadow: 0 2px 20px rgba(167,139,250,0.25), 0 0 60px rgba(167,139,250,0.06);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 40px rgba(167,139,250,0.4), 0 0 80px rgba(167,139,250,0.1);
}
.btn-ghost {
  background: rgba(255,255,255,0.04);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.1);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}
.btn-success {
  background: var(--green);
  color: #000;
  font-weight: 600;
}
.btn-success:hover {
  transform: translateY(-2px) scale(1.02);
  filter: brightness(1.1);
}
.btn-sm { padding: 0.6rem 1.4rem; font-size: 0.82rem; }
.btn-lg { padding: 1rem 2.8rem; font-size: 1rem; }
.btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ─── Glass Card ─── */
.glass {
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  transition: border-color 0.4s, box-shadow 0.4s, transform 0.4s;
}
.glass:hover {
  border-color: rgba(167,139,250,0.15);
  box-shadow: 0 8px 40px rgba(0,0,0,0.2);
}

/* ─── Card ─── */
.card {
  background: var(--bg2);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all 0.4s var(--ease);
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(167,139,250,0.2);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.card-icon { font-size: 2.8rem; margin-bottom: 1rem; }
.card-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.3rem; }
.card-desc { font-size: 0.82rem; color: var(--text3); line-height: 1.6; }

/* ─── Feature Cell ─── */
.feat-cell {
  background: var(--bg1);
  padding: 2.5rem 2rem;
  transition: background 0.4s;
}
.feat-cell:hover { background: var(--bg2); }
.feat-icon { font-size: 2.2rem; margin-bottom: 1.2rem; }
.feat-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.5rem; }
.feat-desc { font-size: 0.85rem; color: var(--text3); line-height: 1.65; }

/* ─── Device Pill ─── */
.device-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 1.8rem;
  background: var(--green-dim);
  border: 1px solid rgba(52,211,153,0.2);
  border-radius: var(--radius-pill);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--green);
  transition: all 0.3s;
}
.device-pill:hover {
  background: rgba(52,211,153,0.15);
  border-color: rgba(52,211,153,0.4);
  transform: translateY(-2px);
}
.device-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 12px rgba(52,211,153,0.5);
  animation: pulse-dot 2s infinite;
}

/* ─── Tag ─── */
.tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  font-size: 0.78rem;
  color: var(--text3);
  transition: all 0.3s;
}
.tag:hover { background: rgba(255,255,255,0.08); color: var(--text2); }

/* ─── Price Card ─── */
.price-card {
  background: var(--bg2);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 3rem 2rem;
  text-align: center;
  position: relative;
  transition: all 0.4s var(--ease);
}
.price-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.price-card.hot {
  border-color: var(--violet);
  background: linear-gradient(180deg, rgba(167,139,250,0.06), var(--bg2));
}
.price-badge {
  position: absolute;
  top: -14px; left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  color: #000;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 0.35rem 1.2rem;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
}
.price-label { font-size: 0.95rem; color: var(--text2); margin-bottom: 0.6rem; }
.price-num {
  font-size: 4rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
}
.price-unit { font-size: 1rem; font-weight: 400; color: var(--text3); }
.price-desc { font-size: 0.82rem; color: var(--text3); margin-top: 1.2rem; line-height: 1.7; }

/* ─── Extras ─── */
.extras {
  max-width: 460px;
  margin: 2rem auto 0;
  background: var(--bg3);
  border-radius: var(--radius-sm);
  padding: 1.8rem;
  border: 1px solid rgba(255,255,255,0.06);
}
.extras-title { font-size: 0.85rem; font-weight: 600; color: var(--violet); margin-bottom: 1rem; }
.extras-row {
  display: flex;
  justify-content: space-between;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.extras-row:last-child { border-bottom: none; }
.extras-name { color: var(--text2); font-size: 0.9rem; }
.extras-price { color: var(--violet); font-weight: 600; font-size: 0.9rem; }

/* ─── QQ Box ─── */
.qq-box {
  background: linear-gradient(135deg, rgba(167,139,250,0.08), rgba(96,165,250,0.08));
  border: 1px solid rgba(167,139,250,0.15);
  border-radius: var(--radius);
  padding: 3.5rem 2rem;
  max-width: 480px;
  margin: 0 auto;
}
.qq-num {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  margin: 1rem 0;
}

/* ─── FAQ ─── */
.faq-list {
  max-width: 680px;
  width: 100%;
  margin: 2.5rem auto 0;
}
.faq-item {
  border-bottom: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
}
.faq-q {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 1.6rem 0;
  transition: color 0.25s;
  user-select: none;
}
.faq-q:hover { color: var(--violet); }
.faq-q::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text3);
  transition: transform 0.4s var(--ease), color 0.3s;
  flex-shrink: 0;
  margin-left: 1rem;
}
.faq-item.open .faq-q::after {
  transform: rotate(45deg);
  color: var(--violet);
}
.faq-a {
  font-size: 0.88rem;
  color: var(--text2);
  line-height: 1.75;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s var(--ease), opacity 0.35s, padding 0.35s;
  padding: 0;
}
.faq-item.open .faq-a {
  max-height: 300px;
  opacity: 1;
  padding-bottom: 1.6rem;
}

/* ─── Footer ─── */
.footer {
  padding: 4rem 2rem 2.5rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}
.footer-links {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.footer-links a {
  color: var(--text3);
  font-size: 0.85rem;
  transition: color 0.25s;
}
.footer-links a:hover { color: var(--text); }
.footer-copy {
  font-size: 0.72rem;
  color: var(--text4);
  line-height: 2;
}

/* ─── Phone Mockup ─── */
.phone-mockup {
  width: 280px;
  height: 560px;
  border-radius: 40px;
  border: 3px solid rgba(255,255,255,0.12);
  background: var(--bg2);
  position: relative;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.05),
    0 20px 80px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.08);
  flex-shrink: 0;
}
.phone-mockup::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 26px;
  background: var(--bg);
  border-radius: 20px;
  z-index: 2;
}
.phone-screen {
  position: absolute;
  inset: 3px;
  border-radius: 37px;
  overflow: hidden;
  background: linear-gradient(160deg, #1a1040, #0a0a20, #0d1b2a);
}
.phone-screen-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(167,139,250,0.2), rgba(96,165,250,0.15), rgba(244,114,182,0.1));
}
.phone-screen-content {
  position: relative;
  z-index: 2;
  padding: 60px 24px 24px;
  text-align: center;
}
.phone-screen-logo {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}
.phone-screen-text {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
}

/* ─── Magnetic Button Wrapper ─── */
.magnetic { display: inline-block; }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .nav { gap: 1rem; font-size: 0.72rem; padding: 0 1rem; }
  .btn-group { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 320px; }
  .phone-mockup { width: 220px; height: 440px; }
  .phone-mockup::before { width: 80px; height: 20px; top: 10px; }
  .qq-num { font-size: 2.5rem; }
}