/* =========================
   THEME VARIABLES + BASE
   ========================= */
:root{
  --primary-blue:#5B8DEF;
  --accent-orange:#FF9F43;
  --background-light:#F9FAFB;
  --card-white:#FFFFFF;
  --secondary-beige:#F4EDE4;
  --text-dark:#1F2937;
  --text-muted:#6B7280;

  --border:#E5E7EB;
  --shadow:0 2px 12px rgba(0,0,0,0.04);
}

/* optional base reset */
*{ box-sizing:border-box; }
body{
  margin:0;
  font-family:'Inter', sans-serif;
  background:var(--background-light);
  color:var(--text-dark);
}

/* =========================
   HEADER LAYOUT (DESKTOP)
   ========================= */
.site-header{
  background:#fff;
  box-shadow:var(--shadow);
  padding:16px 32px;
  position:sticky;
  top:0;
  z-index:1000;

  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:16px;
}

/* Left: logo */
.header-left .logo{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
}

.logo img,
.logo-img,
.custom-logo{
  height:80px;
  width:auto;
  display:block;
}

/* Center: menu + search */
.header-center{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:28px;
  min-width:0; /* quan trọng để không đẩy layout khi hẹp */
}

/* Nav link */
.nav-link{
  text-decoration:none;
  color:#374151;
  font-size:16px;
  font-weight:500;
  white-space:nowrap;
}
.nav-link:hover{ color:var(--primary-blue); }

/* Search */
.header-search{
  display:flex;
  align-items:center;
  min-width:0;
}
.header-search input{
  width:260px;
  padding:8px 18px;
  border-radius:999px;
  border:1px solid var(--border);
  font-size:14px;
  outline:none;
}
.header-search input:focus{
  border-color:var(--primary-blue);
}

/* Right: sign in */
.header-right{
  display:flex;
  justify-content:flex-end;
  align-items:center;
}
.sign-in-btn{
  padding:8px 18px;
  border-radius:999px;
  border:1px solid var(--border);
  text-decoration:none;
  color:#374151;
  font-size:14px;
  font-weight:500;
  background:#fff;
}
.sign-in-btn:hover{ background:#F3F4F6; }

/* =========================
   MEGA DROPDOWN (DESKTOP)
   ========================= */
.mega-dropdown{
  position:relative;
  display:inline-flex;
  align-items:center;
}

/* Button "Categories" */
.dropdown-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border:0;
  background:transparent;
  cursor:pointer;

  font-size:16px;
  font-weight:500;
  color:#374151;

  padding:6px 10px;
  border-radius:10px;
  white-space:nowrap;
}
.dropdown-btn:hover{
  color:var(--primary-blue);
  background:#F3F4F6;
}
.dropdown-caret{ font-size:12px; opacity:.85; }

/* Mega menu panel */
.mega-menu{
  position:absolute;
  top:calc(100% + 12px);
  left:50%;
  transform:translateX(-50%);
  width:min(560px, 86vw);

  background:#fff;
  border:1px solid var(--border);
  border-radius:18px;
  box-shadow:0 16px 40px rgba(0,0,0,0.12);

  padding:18px 18px 16px;
  display:none;
  z-index:9999;
}

/* show on hover or keyboard focus */
.mega-dropdown:hover .mega-menu,
.mega-dropdown:focus-within .mega-menu{
  display:block;
}

.mega-title{
  font-size:16px;
  font-weight:700;
  color:#1F2937;
  margin:0 0 14px 0;
}

/* Columns */
.mega-cols{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:0;
}
.mega-col{
  list-style:none;
  margin:0;
  padding:0 18px;
}
.mega-col + .mega-col{
  border-left:1px solid var(--border);
}

/* Items */
.mega-item{
  display:flex;
  align-items:center;
  gap:10px;
  padding:8px 6px;
  border-radius:10px;
  text-decoration:none;
  color:#374151;
  font-size:18px;
}
.mega-item:hover{
  background:#F3F4F6;
  color:var(--primary-blue);
}
.mega-ico{
  width:22px;
  display:inline-flex;
  justify-content:center;
  opacity:.9;
}
.mega-text{ line-height:1.2; }

/* =========================
   RESPONSIVE: TABLET/MOBILE
   Goal:
   - Row 1: logo + sign in
   - Row 2: menu (scroll) + short search
   ========================= */
@media (max-width: 900px){
  .site-header{
    padding:12px 14px;

    grid-template-columns: 1fr auto;
    grid-template-areas:
      "left right"
      "center search";
    gap:10px;
  }

  .header-left{ grid-area:left; }
  .header-right{ grid-area:right; }
  .header-center{ grid-area:center; }
  .header-search{ grid-area:search; }

  /* Logo smaller */
  .logo img,
  .logo-img,
  .custom-logo{
    height:52px;
  }

  .sign-in-btn{
    padding:8px 12px;
    font-size:13px;
  }

  /* Menu: scroll ngang */
  .header-center{
    justify-content:flex-start;
    gap:10px;

    overflow-x:auto;
    overflow-y:hidden;
    white-space:nowrap;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;

    padding-bottom:2px;
    min-width:0;
  }
  .header-center::-webkit-scrollbar{ display:none; }

  .nav-link,
  .dropdown-btn{
    font-size:14px;
    padding:10px 12px;
    border-radius:12px;
  }

  /* Search: short */
  .header-search{
    justify-self:end;
    width:auto;
    min-width:0;
  }
  .header-search input{
    width:140px;      /* 👈 chỉnh ngắn/dài */
    max-width:42vw;
    padding:8px 12px;
    font-size:14px;
  }

  /* Mega menu: full width panel on mobile */
  .mega-menu{
    left:0;
    transform:none;
    width:calc(100vw - 24px);
    margin:0 12px;

    max-height:70vh;
    overflow:auto;

    padding:14px;
    border-radius:16px;
  }

  /* Mega columns: 2 cols on tablet */
  .mega-cols{ grid-template-columns: repeat(2, 1fr); }
  .mega-col + .mega-col{ border-left:0; }
  .mega-col:nth-child(2){ border-left:1px solid var(--border); }

  .mega-item{
    font-size:16px;
    padding:10px 8px;
  }
}

/* Phones */
@media (max-width: 560px){
  .site-header{ padding:10px 12px; gap:8px; }

  .logo img,
  .logo-img,
  .custom-logo{ height:46px; }

  .sign-in-btn{
    padding:7px 10px;
    font-size:12.5px;
  }

  .nav-link,
  .dropdown-btn{
    padding:9px 10px;
    font-size:13.5px;
  }

  .header-search input{
    width:120px;
    max-width:48vw;
  }

  /* Mega: 1 col on small phones */
  .mega-cols{ grid-template-columns: 1fr; }
  .mega-col{ padding:0 6px; }
  .mega-col + .mega-col{
    border-left:0;
    border-top:1px solid var(--border);
    padding-top:10px;
    margin-top:10px;
  }
}
/* =========================
   HEADER (DESKTOP: 1 ROW)
   Logo | Nav | Search | Sign In
   ========================= */

:root{
  --primary-blue:#5B8DEF;
  --border:#E5E7EB;
  --shadow:0 2px 12px rgba(0,0,0,0.04);
}

*{ box-sizing:border-box; }

.site-header{
  background:#fff;
  box-shadow:var(--shadow);
  position:sticky;
  top:0;
  z-index:1000;

  padding:16px 32px;

  display:grid;
  grid-template-columns: auto 1fr auto auto; /* logo | nav | search | right */
  grid-template-areas: "left nav search right";
  align-items:center;
  gap:16px;
}

.header-left{ grid-area:left; }
.header-nav{ grid-area:nav; }
.header-search{ grid-area:search; }
.header-right{ grid-area:right; }

/* Logo */
.header-left .logo{ display:flex; align-items:center; text-decoration:none; }
.logo img, .logo-img, .custom-logo{ height:80px; width:auto; display:block; }

/* Right */
.header-right{ display:flex; justify-content:flex-end; }
.sign-in-btn{
  padding:8px 18px;
  border-radius:999px;
  border:1px solid var(--border);
  text-decoration:none;
  color:#374151;
  font-size:14px;
  font-weight:500;
  background:#fff;
}
.sign-in-btn:hover{ background:#F3F4F6; }

/* Nav */
.header-nav__scroll{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:28px;
  min-width:0;
}
.nav-link{
  text-decoration:none;
  color:#374151;
  font-size:16px;
  font-weight:500;
  white-space:nowrap;
}
.nav-link:hover{ color:var(--primary-blue); }

/* Search */
.header-search{ display:flex; justify-content:flex-end; }
.header-search input{
  width:260px;
  height:38px;
  line-height:38px;
  padding:0 18px;
  border-radius:999px;
  border:1px solid var(--border);
  font-size:14px;
  outline:none;
}
.header-search input:focus{ border-color:var(--primary-blue); }

/* =========================
   Mega dropdown
   ========================= */
.mega-dropdown{ position:relative; display:inline-flex; align-items:center; }

.dropdown-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  border:0;
  background:transparent;
  cursor:pointer;
  font-size:16px;
  font-weight:500;
  color:#374151;
  padding:6px 10px;
  border-radius:10px;
  white-space:nowrap;
}
.dropdown-btn:hover{ color:var(--primary-blue); background:#F3F4F6; }
.dropdown-caret{ font-size:12px; opacity:.85; }

.mega-menu{
  position:absolute;
  top:calc(100% + 12px);
  left:50%;
  transform:translateX(-50%);
  width:min(560px, 86vw);
  background:#fff;
  border:1px solid var(--border);
  border-radius:18px;
  box-shadow:0 16px 40px rgba(0,0,0,0.12);
  padding:18px 18px 16px;
  display:none;
  z-index:9999;
}
.mega-dropdown:hover .mega-menu,
.mega-dropdown:focus-within .mega-menu{ display:block; }

.mega-title{ font-size:16px; font-weight:700; margin:0 0 14px; color:#1F2937; }
.mega-cols{ display:grid; grid-template-columns:repeat(3,1fr); gap:0; }
.mega-col{ list-style:none; margin:0; padding:0 18px; }
.mega-col + .mega-col{ border-left:1px solid var(--border); }

.mega-item{
  display:flex; align-items:center; gap:10px;
  padding:8px 6px; border-radius:10px;
  text-decoration:none; color:#374151; font-size:18px;
}
.mega-item:hover{ background:#F3F4F6; color:var(--primary-blue); }
.mega-ico{ width:22px; display:inline-flex; justify-content:center; opacity:.9; }

/* =========================
   MOBILE: 3 ROWS
   Row1: logo + sign in
   Row2: menu scroll only
   Row3: search full (or short)
   ========================= */
@media (max-width: 900px){
  .site-header{
    padding:12px 14px;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "left right"
      "nav  nav"
      "search search";
    gap:10px;
  }

  .logo img, .logo-img, .custom-logo{ height:52px; }
  .sign-in-btn{ padding:8px 12px; font-size:13px; }

  /* menu scroll - only nav scrolls */
  .header-nav__scroll{
    justify-content:flex-start;
    gap:10px;
    overflow-x:auto;
    overflow-y:visible; /* tránh cut */
    white-space:nowrap;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
    padding-bottom:2px;
  }
  .header-nav__scroll::-webkit-scrollbar{ display:none; }

  .nav-link, .dropdown-btn{
    font-size:14px;
    padding:10px 12px;
    border-radius:12px;
  }

  /* search row */
  .header-search{ justify-content:flex-start; }
  .header-search input{
    width:100%;
    max-width:100%;
    height:38px;
    line-height:38px;
    padding:0 14px;
  }

  /* mega full width on mobile */
  .mega-menu{
    left:0;
    transform:none;
    width:calc(100vw - 24px);
    margin:0 12px;
    max-height:70vh;
    overflow:auto;
    padding:14px;
    border-radius:16px;
  }
  .mega-cols{ grid-template-columns:repeat(2,1fr); }
  .mega-col + .mega-col{ border-left:0; }
  .mega-col:nth-child(2){ border-left:1px solid var(--border); }
  .mega-item{ font-size:16px; padding:10px 8px; }
}

@media (max-width: 560px){
  .site-header{ padding:10px 12px; gap:8px; }
  .logo img, .logo-img, .custom-logo{ height:46px; }
  .sign-in-btn{ padding:7px 10px; font-size:12.5px; }

  .mega-cols{ grid-template-columns:1fr; }
  .mega-col{ padding:0 6px; }
  .mega-col + .mega-col{
    border-left:0;
    border-top:1px solid var(--border);
    padding-top:10px;
    margin-top:10px;
  }
}