/* ============================================
   NAV.CSS - Menu 9 nút
   ============================================ */

#main-nav {
  display: flex;
  background: var(--bg2);
  border-color: var(--border);
  border-style: solid;
  z-index: 100;
  gap: 2px;
  padding: 4px;
  flex-shrink: 0; /* ← không bị nén bởi flex parent */
}

/* ===== DESKTOP: dọc bên trái ===== */
@media (min-width: 768px) {
  #main-nav {
    flex-direction: column;
    width: 80px;
    height: 100%;
    border-right-width: 1px;
    border-top-width: 0;
    border-bottom-width: 0;
    border-left-width: 0;
    padding: 8px 4px;
    overflow-y: auto;
  }
}

/* ===== MOBILE: ngang dưới ===== */
@media (max-width: 767px) {
  #main-nav {
    flex-direction: row;
    width: 100%;
    height: 60px;
    border-top-width: 1px;
    border-right-width: 0;
    border-bottom-width: 0;
    border-left-width: 0;
    padding: 4px;
    overflow-x: auto;
    overflow-y: hidden;
    /* Đặt ở dưới cùng — game-screen là flex-col nên nav tự xuống đáy */
    order: 2;
  }

  /* Ẩn scrollbar ngang nhưng vẫn scroll được */
  #main-nav::-webkit-scrollbar { display: none; }
}

/* ===== NAV BUTTON ===== */
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: transparent;
  border: none;
  border-radius: 10px;
  color: var(--text-dim);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  position: relative;
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .nav-btn {
    width: 100%;
    padding: 10px 4px;
  }
}

@media (max-width: 767px) {
  .nav-btn {
    flex: 1;
    min-width: 52px;
    padding: 4px 2px;
  }
}

.nav-btn:hover {
  background: var(--bg3);
  color: var(--text);
}

/* ===== ACTIVE STATE chung ===== */
.nav-btn.active {
  color: var(--text-bright);
  background: #2a3040; /* xám xanh nhạt */
}

/* Indicator line */
.nav-btn.active::before {
  content: '';
  position: absolute;
  border-radius: 2px;
  background: var(--accent);
}

@media (min-width: 768px) {
  .nav-btn.active::before {
    left: 0; top: 20%; bottom: 20%;
    width: 3px;
  }
}

@media (max-width: 767px) {
  .nav-btn.active::before {
    top: 0; left: 20%; right: 20%;
    height: 3px;
  }
}

/* ===== HOME BUTTON — nổi bật hơn ===== */
.nav-btn[data-page="home"] {
  background: #1a2e1a;           /* xám xanh lá khi không active */
  border: 1px solid rgba(0,180,60,0.15);
}

.nav-btn[data-page="home"]:hover {
  background: #1e3a1e;
  color: #66dd66;
}

.nav-btn[data-page="home"].active {
  background: #0d2e0d;
  color: #00e64d;
  border: 1px solid rgba(0,230,77,0.4);
  box-shadow: 0 0 12px rgba(0,200,60,0.25);
}

.nav-btn[data-page="home"].active::before {
  background: #00e64d;
}

/* ===== ICON & LABEL ===== */
.nav-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.nav-label {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  line-height: 1;
}

@media (min-width: 768px) {
  .nav-label {
    font-size: 0.6rem;
    letter-spacing: 0.5px;
  }
}

@media (max-width: 767px) {
  .nav-label {
    font-size: 0.55rem;
  }
}

/* ===== CASINO BUTTON — gold tint ===== */
.nav-btn[data-page="casino"] {
  background: rgba(40,30,5,0.6);
}
.nav-btn[data-page="casino"]:hover {
  background: rgba(50,38,8,0.8);
  color: #ddaa22;
}
.nav-btn[data-page="casino"].active {
  background: linear-gradient(135deg, #1a1205, #0d0a02);
  color: var(--gold);
  border: 1px solid rgba(200,160,20,0.3);
  box-shadow: 0 0 12px rgba(180,140,10,0.2);
}
.nav-btn[data-page="casino"].active::before {
  background: var(--gold);
}

/* ===== UNDERGROUND BUTTON — red danger ===== */
.nav-btn[data-page="underground"] {
  background: rgba(30,5,5,0.6);
}
.nav-btn[data-page="underground"]:hover {
  background: rgba(50,8,8,0.8);
  color: #cc3333;
}
.nav-btn[data-page="underground"].active {
  background: linear-gradient(135deg, #1a0404, #0d0202);
  color: #ff3333;
  border: 1px solid rgba(180,20,20,0.35);
  box-shadow: 0 0 12px rgba(180,0,0,0.2);
  text-shadow: 0 0 8px rgba(255,30,30,0.4);
}
.nav-btn[data-page="underground"].active::before {
  background: #ff2222;
}