/* =========================
   BASE / UTILS
   ========================= */
@import url('https://fonts.googleapis.com/css2?family=Zalando+Sans+Expanded:ital,wght@0,200..900;1,200..900&display=swap');
:root{
  --accent:rgb(2, 134, 61);
  --accent-dark:rgb(123, 255, 31);
  --muted:#244759;
  --bg:#d7efdf;
  --glass: rgb(48 48 48 / 70%);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family: "Zalando Sans Expanded",
    sans-serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;
  background:var(--bg);
  color:#222;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:0;
    overflow-x: hidden;
}

/* thay doi thanh scroll */
::-webkit-scrollbar {
  scroll-behavior: smooth;
  width: 3px;
  height: 5px;
  background-color: #ccc;
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(#ccc, #e0a103);
  border-radius: 3px;
  transition: .5s;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(#ccc, #ff0000);
}

img {
  object-fit: cover;
   max-width: 100%;
}
/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
 ul, li {
list-style: none;
vertical-align: baseline;
  }


/* container */
.container{
  max-width:1300px;
  margin:0 auto;
  padding:0 20px;
}

.container-full{
  width:100%;
  margin:0 auto;
  padding:0 0px;
}
.container-1600 {
  max-width: 1600px;
  margin: 0 auto;
  padding: 80px 0px;
}
/* =========================
   HEADER / NAV
   ========================= */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  transition:box-shadow .28s ease, background .28s ease, transform .28s ease;
  background:transparent;
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:80px;
}
.brand{
  padding:8px 10px;
}
.brand img{ max-width:160px }
/* desktop nav */
.nav{
  display:flex;
  gap:18px;
  margin-left:auto;
}
.nav-link{
  display:inline-block;
  color:var(--accent-dark);
  text-decoration:none;
  padding:15px 10px;
  border-radius:6px;
  transition: all .22s ease;
  opacity:0.95;
}
.nav-link:hover{ background:rgba(255,255,255,0.12); transform:translateY(-2px); padding: 15px 10px; }
.nav-link.active{ background:rgba(0,0,0,0.18); box-shadow:0 6px 18px rgba(0,0,0,0.12); padding: 15px 10px;}

/* sticky (after scrolling) */
.site-header.scrolled{
  background:var(--accent);
  box-shadow:0 6px 20px rgba(0,0,0,0.12);
  backdrop-filter: blur(6px);
}
.site-header.scrolled .brand{ color:var(--accent-dark); background:transparent; }

/* hamburger (mobile) */
.hamburger{
  display:none;
  margin-left:auto;
  background:transparent;border:0;padding:6px;cursor:pointer;
}
.hamburger span{display:block;width:22px;height:2px;background: var(--accent-dark);margin:4px 0;border-radius:2px;transition:all .2s}

/* mobile menu */
.mobile-menu{
  display:none;
  position:fixed;top:64px;right:0;left:0;
  background:rgba(255,255,255,0.98);
  z-index:900;
  box-shadow:0 8px 30px rgba(0,0,0,0.08);
}
.mobile-nav{
  display:flex;flex-direction:column;padding:14px 20px;gap:8px; height: 100vh;
    background: var(--accent);
}
.mobile-link{color:#fff;text-decoration:none;padding:10px;border-radius:6px}
.mobile-link:hover{background:#f2f2f2}

/* =========================
   HERO (video background)
   ========================= */
.hero-section{
  height:97vh;
  position:relative;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  width: 100%;
  background: linear-gradient(to bottom, #001122, #000811);
}
 /* .hero-video{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;
  filter: saturate(1.02) contrast(1.02) brightness(.95);
} */
.hero-overlay{
  position:relative;z-index:2;text-align:center;padding:40px; top: 75%;
}
.hero-title{font-size:42px;letter-spacing:1px;margin-bottom:10px;text-shadow:0 6px 30px rgba(0,0,0,0.45)}
.hero-sub{font-size:18px;margin-bottom:20px;opacity:0.95}
.hero-cta{display:inline-block; background-color: #fff;
  transition:transform .18s ease, box-shadow .18s; padding: 15px 20px; border-radius: 10px;
  box-shadow: 0 6px 75px var(--accent-dark); border: var(--accent) 1px solid;}
.hero-cta:hover{transform:translateY(-4px);}

.page-inner{
  max-height: 80px;
}
/* =========================
   PANELS / SECTIONS
   =========================
.panel{padding:110px 0;text-align:center}
.panel-alt{background:#e9e9e9}
.section-title{font-size:28px;margin-bottom:18px;color:var(--muted);letter-spacing:1px}
.panel-inner{max-width:1920px;margin:0 auto}
.image-block{
  height:320px;background:linear-gradient(180deg,#fff,#f7f7f7);
  display:flex;align-items:center;justify-content:center;font-size:48px;color:#333;border-radius:6px;
  border:1px solid #eee;box-shadow:0 8px 20px rgba(10,10,10,0.04)
}
.lead{max-width:760px;margin:22px auto 30px;color:var(--muted)}

/* small button */
.btn {
  display: inline-block;
  padding: 15px 25px;
  /*width: 380px;*/
  text-align: center;
  border-radius: 10px;
  background: var(--accent-dark);
  font-size: 30px;
  font-family: "Zalando Sans Expanded";
  position: absolute;
  bottom: 30%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
  cursor: pointer; border: none;
  transition: all 0.3s ease;
}

.btn:hover {
  background: var(--accent)
}

.btn-2 {
  display: inline-block;
  padding: 15px 25px;
  /*width: 380px;*/
  text-align: center;
  border-radius: 10px;
  background: var(--accent-dark);
  font-size: 30px;
  font-family: "Zalando Sans Expanded";
  position: absolute;
  bottom: 26%;
  left: 73%;
  transform: translateX(-50%);
  z-index: 10;
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

.btn-2:hover {
  background: var(--accent)
}
/* =========================
   FOOTER
   ========================= */
#footer{margin-top:0px;}

.footer {
    background: linear-gradient(to bottom, #001122, #000811);
    padding: 60px 20px 40px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('../images/bg-f.png') repeat;
    opacity: 0.3;
    pointer-events: none;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.footer-left {
    flex: 1;
    min-width: 300px;
}

.logo {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    font-size: 24px;
    font-weight: bold;
}

.logo img {
    width: 60px;
    margin-right: 15px;
}

address {
    font-style: normal;
    line-height: 1.8;
    color: #ccc;
}

.footer-right {
    flex: 1;
    min-width: 300px;
    text-align: right;
}
.footer-links {
  margin-left: auto;
  width: fit-content;
display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.wsb-title {
    font-size: 36px;
    color: #39ff14; /* Màu xanh neon*/
    margin-bottom: 30px;
    font-weight: bold;
}

.menu-links {
    list-style: none;
    text-align: left;
}

.menu-links li {
    margin-bottom: 30px;
}

.menu-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s ease;
}

.menu-links a:hover {
    color: #39ff14;
}

.social-icons {
    text-align: left;
    margin: 20px 0 20px;
}

.social-icons a {
    display: inline-block;
    margin: 0 5px;
    font-size: 26px;
    color: #888;
    transition: all 0.4s ease; /* Hiệu ứng mượt */
}

.social-icons a:hover {
    color: #39ff14;
    transform: scale(1.3) translateY(-5px); /* Phóng to + nhảy nhẹ lên */
}

.copyright {
    text-align: center;
    color: #666;
    font-size: 14px;
    position: relative;
    z-index: 1;
    margin: 35px 0px 0px 0;
    line-height: 1;
}

/* Responsive cho mobile */
@media (max-width: 768px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
    }

    .footer-right {
        text-align: center;
    }

    .logo {
        justify-content: center;
    }
}



/* =========================
   SIDE NAV (dots hover show text)
   ========================= */
.side-nav{
  position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:1200;
}
.side-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.side-nav a{display:block;width:14px;height:14px;background:rgba(255,255,255,0.85);border-radius:50%;position:relative;text-decoration:none;transition:all .22s;box-shadow:0 6px 18px rgba(0,0,0,0.08)}
.side-nav a:hover{transform:scale(1.08)}
.side-nav a span{
  position:absolute;right:calc(100% + 18px);top:50%;transform:translateY(-50%) scale(.95);
  background:#fff;padding:8px 14px;border-radius:999px;color:#222;font-weight:700;white-space:nowrap;
  box-shadow:0 8px 28px rgba(0,0,0,0.12);opacity:0;pointer-events:none;transition:all .28s;
}
.side-nav a:hover span{opacity:1;transform:translateY(-50%) scale(1)}
.side-nav a.active{background:var(--accent);box-shadow:0 8px 22px rgba(11,107,181,.22)}
.side-nav a.active span{opacity:1;}

/* =========================
   SIDE NAV (dots hover show text)
   ========================= */
.side-nav{
  position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:1200;
}
.side-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.side-nav a{display:block;width:14px;height:14px;background:rgba(255,255,255,0.85);border-radius:50%;position:relative;text-decoration:none;transition:all .22s;box-shadow:0 6px 18px rgba(0,0,0,0.08)}
.side-nav a:hover{transform:scale(1.08)}
.side-nav a span{
  position:absolute;right:calc(100% + 2px);top:50%;transform:translateY(-50%) scale(.95);
  background:#fff;padding:8px 14px;border-radius:999px;color:#222;font-weight:300;white-space:nowrap; font-size: 10px;
  box-shadow:0 8px 28px rgba(0,0,0,0.12);opacity:0;pointer-events:none;transition:all .28s;
}
.side-nav a:hover span{opacity:1;transform:translateY(-50%) scale(1)}
.side-nav a.active{background:var(--accent);box-shadow:0 8px 22px rgba(11,107,181,.22)}
.side-nav a.active span{opacity:1;}

/* =========================
   SIDE NAV (dots hover show text)
   ========================= */
.side-Highlights-side-nav {
  position: fixed;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1200;
}

.side-Highlights-side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px
}
.side-Highlights-side-nav ul li {
  position: relative;
  background: none ;
  color: var(--accent);
  border: 3px solid var(--accent);
  border-radius: 5px;
}
.side-Highlights-side-nav a {
  display: block;
  width: 100px;
  height: 50px;
  border-radius: 3px;
  position: relative;
  text-decoration: none;
  transition: all .22s;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08)
}

.side-Highlights-side-nav a:hover {
  transform: scale(1.08)
}

.side-Highlights-side-nav  a span {
  position: absolute;
  right: 25%;
  top: 50%;
  transform: translateY(-50%) scale(.95);
  background: none;
  padding: 8px 0px;
  text-align: center;
  border-radius: 999px;
  color: var(--accent);
  font-weight: 700;
  white-space: nowrap;
  opacity: 1;
  pointer-events: none;
  transition: all .28s;
}

.side-Highlights-side-nav a:hover span {
  opacity: 1;
  transform: translateY(-50%) scale(1)
}

.side-Highlights-side-nav a.active {
  background: var(--accent);
  box-shadow: 0 8px 22px rgba(11, 107, 181, .22)
}

.side-Highlights-side-nav a.active span {
  opacity: 1;
}

/* =========================
   TO TOP
   ========================= */
.to-top{position:fixed;right:20px;bottom:20px;background:#111;color:#fff;border:0;padding:10px 12px;border-radius:50%;display:none;z-index:1300;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,0.18)}
.to-top.show{display:block;transform:translateY(0);transition:transform .3s}

/* =========================
   Fade-in helper (initial hidden state)
   ========================= */
.fade-in{opacity:0;transform:translateY(30px);transition:opacity .8s ease, transform .8s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}


/* =========================
   RESPONSIVE
   ========================= */
@media (max-width: 980px){
  .nav{display:none}
  .hamburger{display:block; margin-right: 15px}
  .brand{color:#fff}
}
@media (max-width: 640px){
  .hero-title{font-size:28px}
  .hero-sub{font-size:15px}
  .header-inner{height:64px}
  .logo {
        justify-content: left;
    }
  .footer-links{ display: inline-flex;   align-items: flex-start; width:100% }
  .footer-left { text-align:left; }
}




/* ============================= */
/* THUMBNAIL GALLERY             */
/* ============================= */

.thumb-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.thumb-item {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
}

.thumb-item img {
  width: 100%;
  display: block;
  transition: .3s ease;
}

.thumb-item:hover img {
  transform: scale(1.05);
}

/* icon play cho video */
.icon-play {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  color: white;
  background: rgba(0,0,0,.5);
  padding: 10px 14px;
  border-radius: 50%;
  font-size: 18px;
}

/* ============================= */
/* LIGHTBOX POPUP (mượt hơn)     */
/* ============================= */

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .35s ease, visibility .35s ease;
  z-index: 999;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90%;
  opacity: 0;
  transform: scale(.8);
  transition: opacity .35s ease, transform .35s ease;
}

.lightbox.active .lightbox-content {
  opacity: 1;
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 40px;
  right: 50px;
  font-size: 40px;
  color: white;
  cursor: pointer;
  transition: .2s;
}

.lightbox-close:hover {
  transform: scale(1.2);
}

/* ============================= */
/* SUB CONTENT     */
/* ============================= */
.sub-content {
  margin-top: 80px;
  color: #fff;
  text-align: center;
}
.sub-section {
  margin-top: 40px;
}
.sub-section ul {
  list-style: disc inside;
  display: grid;
  /* align-items: center; */
grid-template-columns: 50% 50%;
  gap: 0px;
}
.sub-section li {
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
}
.sub-section li img
{
  width: 100%;
  margin-top: 8px;
}

/* ============================= */
/* DUAL SLIDER DESKTOP           */
/* ============================= */

.dual-slider {
  position: relative;
  width: 100%;
  overflow: hidden;
  margin-bottom: 40px;
  margin-top: 40px;
  box-shadow: 0 6px 75px #8a9388;
  border-radius: 30px;
}

.slider-viewport {
  overflow: hidden;
  width: 100%;

}

.slider-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(.4,0,.2,1);
}

.slide {
  flex: 0 0 50%;
  padding: 0;
}

.slide img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

/* arrows */
.dual-slider .nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.85);
  cursor: pointer;
  font-size: 18px;
  transition: .2s;
}

.dual-slider .nav:hover {
  background: #fff;
  transform: translateY(-50%) scale(1.1);
}

.dual-slider .nav.prev { left: 10px; }
.dual-slider .nav.next { right: 10px; }
.dual-slider .nav.prev i{ position: absolute; left: 10px; top: 13px}
.dual-slider .nav.next i{ position: absolute; left: 10px; top: 13px}

/* ============================= */
/* project-highlight DESKTOP           */
/* ============================= */

.project-highlight {
  width: 100%;
  background: linear-gradient(#ABFFB8, #C8FFD7);
  display: flex; justify-content: center;
  padding: 60px 0;

}

.ph-container {
  position: relative;
  width: 1300px;
  max-width: 100%;
  text-align: left;
}
.box-hight-left{
  position: absolute;
  left: 0;
  top: 0;
}
.ph-title {
  max-width: 800px;
  margin-bottom: 20px;
}
.ph-title img{ width:100% }
.ph-sub {
    font-size: 24px;
    max-width: 580px;
    line-height: 1.5;
    margin-bottom: 40px;
}

.ph-btn {
  background: var(--accent);
  color: white;
  border: none;
  font-size: 22px;
  padding: 14px 35px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.ph-btn:hover {
  background: #045e2c;
}


.stairs-wrap {
  position: relative;
  width: 700px;
  margin-left: auto;
}

.stairs-base {
  width: 100%;
  display: block;
}

/* POSITION FIX: pixel theo scale gốc */
.year {
  position: absolute;
  cursor: pointer;
  transition: transform .2s;
}

.year:hover {
  transform: scale(1.08);
}

/* CÁC VỊ TRÍ (theo 1920 width, sẽ scale theo %) */
.y2012 { left: 86px;  top: 675px; width: 120px; }
.y2014 { left: 140px; top: 590px; width: 120px; }
.y2016 { left: 205px; top: 500px; width: 120px; }
.y2018 { left: 270px; top: 410px; width: 120px; }
.y2020 { left: 340px; top: 324px; width: 120px; }
.y2023 { left: 408px; top: 236px; width: 120px; }
.y2025 { left: 473px; top: 147px; width: 120px; }

/* BOX THÔNG TIN */
.year-info {
  position: absolute;
  left: -600px;
  top: 500px;
  width: 440px;
  height: 140px;
  background: none;
  padding: 25px;
  border-radius: 8px;
  border: 3px solid var(--muted);
  opacity: 0;
  pointer-events: auto;
  transition: opacity .35s ease;
  color: var(--muted);
}

.year-info h3{ display: block; padding: 20px 5px; font-size: 34px;
}
.year-info p{ display: block; padding: 15px 5px;

}
.year-info.show {
  opacity: 1;
}



.stairs-wrap, .year-info {
  cursor: default;
}

.year:hover {
  filter: brightness(1.2);
}
.show-mb{ display:none; }
.hid-mb{ display:block; }
.mb-h{ display:none; }

/* MOBILE */
@media(max-width: 768px){
  .stairs-wrap { width: 100%; }
  .year-info { display: none !important; }
  .ph-title, .ph-sub { text-align:center; margin:auto; }
  .ph-btn { display:block; margin:20px auto; }
}
@media(max-width: 500px){
.stairs-wrap { width: 100%; display:none; }
.box-hight-left{ position:relative; }
.mb-h{ display:block; }
.show-mb{ display:block; }
.hid-mb{ display:none; }

.side-Highlights-side-nav{ display:none; }

.hero-section{ height:65vh }
.side-nav{ display:none; }

.ph-btn{ background: var(--accent);
    font-size: 21px;
    padding: 25px 30px;
    max-width: 220px; }
    .ph-sub{
          font-size: 20px;
    max-width: 580px;
    margin-bottom: 40px;
    padding: 20px 20px;
    }
    .ph-title{ padding: 10px 20px;}
    .project-highlight {padding: 0}
    .btn-2{
      display: inline-block;
    padding: 15px 25px;
    /* width: 380px; */
    text-align: center;
    position: absolute;
    bottom: 10%;
    left: 48%;
    font-size: 18px;

    }
}

/* ============================= */
/* MOBILE MODE (STACK IMAGES)    */
/* ============================= */

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .slider-track {
    flex-direction: column;
    transform: none !important;
  }

  .slide {
    flex: 1 0 auto;
    margin-bottom: 16px;
  }
}