/*
Theme Name: Kim Trang Nest - Custom
Theme URI: https://kimtrangnest.vn
Description: Kim Trang Nest custom theme with sticky header that changes color on scroll.
Author: Phat Le & ChatGPT
Version: 3.1
Text Domain: kimtrangnest-custom
*/

:root{
  --ktn-navy: #0a2440;
  --ktn-gold: #bfa14a;
  --ktn-bg: #ffffff;
  --ktn-text: #0f2336;
  --ktn-muted: #6b7480;
  --ktn-max-width: 1200px;
  --ktn-logo-desktop: 110px;
  --ktn-logo-mobile: 70px;
  --ktn-radius: 10px;
  --ktn-transition: 220ms ease;
}

/* Reset & base */
*,
*::before,
*::after{
  box-sizing: border-box;
}
html, body{
  margin: 0;
  padding: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  color: var(--ktn-text);
  background: var(--ktn-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.container{
  max-width: var(--ktn-max-width);
  margin: 0 auto;
  padding: 0 16px;
}

/* Typography & links */
a{
  color: var(--ktn-navy);
  text-decoration: none;
  transition: color var(--ktn-transition);
}
a:hover{
  color: var(--ktn-gold);
  text-decoration: underline;
}
h1,h2,h3,h4{
  margin: 0 0 12px 0;
  color: var(--ktn-navy);
  font-weight: 700;
}
h1{ font-size: 2rem; }
h2{ font-size: 1.6rem; }
p{ margin: 0 0 1em 0; }

/* Buttons */
.button, .btn, button{
  display: inline-block;
  background: var(--ktn-navy);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background var(--ktn-transition), transform var(--ktn-transition);
}
.button:hover, .btn:hover, button:hover{
  transform: translateY(-2px);
}
.btn.gold{
  background: var(--ktn-gold);
  color: var(--ktn-navy);
}

/* =========================
   HEADER – sticky + đổi màu
   ========================= */

.ktn-header{
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10,36,64,0.96); /* navy đậm */
  color: #fff;
  box-shadow: 0 4px 18px rgba(0,0,0,0.15);
  transition: background var(--ktn-transition), box-shadow var(--ktn-transition), padding var(--ktn-transition);
}

.ktn-header-inner{
  max-width: var(--ktn-max-width);
  margin: 0 auto;
  padding: 8px 18px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 24px;
}

/* Logo bên trái */
.ktn-branding{
  flex: 0 0 auto;
}
.ktn-branding img{
  display: block;
  max-height: var(--ktn-logo-desktop);
  width: auto;
  height: auto;
}

/* Nav bên phải */
.ktn-main-navigation{
  flex: 1 1 auto;
}
.ktn-menu{
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Màu chữ menu: TRẮNG khi ở đầu trang */
body:not(.ktn-scrolled) .ktn-menu li a{
  color: #ffffff;
}

/* Màu chữ menu: ĐEN khi kéo xuống (header trong suốt) */
body.ktn-scrolled .ktn-menu li a{
  color: #000000;
}

.ktn-menu li a{
  font-weight: 600;
  padding: 6px 8px;
  text-decoration: none !important;
}
.ktn-menu li a:hover{
  color: var(--ktn-gold);
}

/* Nút menu mobile */
.ktn-menu-toggle{
  display: none;
  background: var(--ktn-gold);
  color: var(--ktn-navy);
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 18px;
  cursor: pointer;
  margin-left: auto;
}

/* Khi cuộn xuống -> header trong suốt */
body.ktn-scrolled .ktn-header{
  background: transparent;
  box-shadow: none;
}

/* Bù khoảng header fixed */
body{
  padding-top: 90px;
}

/* =========================
   MOBILE – menu xổ xuống, logo nhỏ
   ========================= */

@media (max-width: 1024px){
  :root{ --ktn-logo-desktop: 90px; }
  .ktn-branding img{ max-height: var(--ktn-logo-desktop); }
}

@media (max-width: 768px){
  :root{ --ktn-logo-desktop: var(--ktn-logo-mobile); }

  .ktn-header-inner{
    padding: 6px 12px;
  }

  .ktn-branding img{
    max-height: var(--ktn-logo-mobile);
  }

  .ktn-menu-toggle{
    display: inline-flex;
    z-index: 150;
  }
  .ktn-main-navigation{
    flex: 0 0 auto;
  }
  .ktn-main-navigation .ktn-menu{
    display: none;
  }

  body.ktn-menu-open .ktn-main-navigation .ktn-menu{
    display: flex !important;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 8px 12px 0 12px;
    padding: 12px;
    width: calc(100% - 24px);
    max-width: 360px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.10);
  }

  body.ktn-menu-open .ktn-main-navigation{
    position: absolute;
    top: 100%;
    right: 12px;
    left: auto;
    z-index: 140;
  }

  .ktn-main-navigation .ktn-menu li a{
    color: var(--ktn-navy) !important;
    width: 100%;
    padding: 8px 10px;
  }

  body{
    padding-top: 80px;
  }
}

/* =========================
   NỘI DUNG CHÍNH
   ========================= */

.site-main{
  padding: 24px 0 40px;
}
.site-intro{
  padding: 24px 0 16px;
}
.site-intro .lead{
  color: var(--ktn-muted);
}

/* =========================
   FOOTER & HOTLINE
   ========================= */

.ktn-footer{
  background: var(--ktn-navy);
  color: #fff;
  padding: 24px 0 10px;
  margin-top: 32px;
}
.ktn-footer-inner{
  max-width: var(--ktn-max-width);
  margin: 0 auto;
  padding: 0 16px 12px;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  flex-wrap: wrap;
}
.ktn-footer-col{
  flex: 1 1 300px;
  min-width: 220px;
}
.ktn-footer-col h4{
  color: var(--ktn-gold);
  margin-bottom: 8px;
}
.ktn-footer-col p,
.ktn-footer-col a{
  color: #ffffff;
  margin: 4px 0;
}
.ktn-footer-bottom{
  text-align: center;
  padding: 8px 16px;
  font-size: 13px;
  opacity: 0.9;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.ktn-float-contact{
  position: fixed;
  right: 16px;
  bottom: 20px;
  background: var(--ktn-gold);
  color: var(--ktn-navy);
  padding: 12px 14px;
  border-radius: 50%;
  font-size: 20px;
  text-decoration: none;
  z-index: 200;
  box-shadow: 0 8px 20px rgba(0,0,0,0.18);
}

/* Helpers */
.text-center{ text-align: center; }
.m-0{ margin: 0; }
.p-0{ padding: 0; }

.ktn-branding,
.ktn-header-inner,
.ktn-main-navigation,
.ktn-menu-toggle{
  left: auto !important;
  transform: none !important;
}
/* Căn logo sát trái */
.site-header .custom-logo-link img {
    max-height: 70px;
    margin-left: 0 !important;
    padding-left: 0 !important;
}

/* Căn vị trí logo */
.site-header .custom-logo-link {
    margin-left: 0 !important;
    padding-left: 0 !important;
}

/* Menu căn sát phải, không bị xô */
.site-header .main-navigation {
    margin-right: 20px !important;
}

/* Header cố định và trong suốt khi chưa cuộn */
.site-header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 9999;
    background: rgba(0, 32, 64, 0.9); /* nền xanh đậm hơi trong */
    transition: background 0.3s ease, padding 0.3s ease;
}

/* Khi cuộn xuống header thu nhỏ và nền đặc */
.site-header.scrolled {
    background: #002040; /* màu xanh đậm của Kim Trang Nest */
    padding: 5px 0;
}

/* Chữ menu chuyển màu khi cuộn */
.site-header.scrolled .main-navigation a {
    color: #fff !important;
}