/* ===== BCONS SAIGON – MAIN CSS ===== */
:root {
  --yellow: #F5C518;
  --yellow-dark: #D4A017;
  --yellow-light: #FFE066;
  --blue: #0057A8;
  --blue-dark: #003D7A;
  --blue-light: #E8F2FF;
  --black: #0D0D0D;
  --white: #FFFFFF;
  --gray: #6B7280;
  --gray-light: #F4F6F9;
  --text: #374151;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.15);
  --transition: all 0.3s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', 'Arial', sans-serif; color: var(--text); background: var(--white); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
select, input, textarea { font-family: inherit; }

/* ===== HOTLINE TICKER ===== */
.hotline-ticker {
  background: linear-gradient(90deg, var(--blue-dark), var(--blue));
  color: white;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 20px;
  text-align: center;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1001;
}
.hotline-ticker a { color: var(--yellow); font-weight: 700; }

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 36px; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
  border-bottom: 3px solid var(--yellow);
  transition: var(--transition);
}
.header__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.header__logo img { height: 52px; width: auto; object-fit: contain; }

/* NAV */
.header__nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: center; }
.nav__item { position: relative; }
.nav__link {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 14px;
  font-size: 14px; font-weight: 600;
  color: var(--black);
  border-radius: var(--radius);
  transition: var(--transition);
  white-space: nowrap;
}
.nav__link:hover, .nav__link.active { color: var(--blue); background: var(--blue-light); }
.nav__item:hover .nav__dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 260px;
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  border: 1px solid rgba(0,0,0,0.08);
  z-index: 100;
}
.nav__dropdown-title { font-size: 11px; font-weight: 800; color: var(--gray); text-transform: uppercase; letter-spacing: 1.5px; padding: 8px 12px 4px; }
.nav__dropdown-link { display: block; padding: 10px 12px; font-size: 14px; color: var(--text); border-radius: var(--radius); transition: var(--transition); }
.nav__dropdown-link:hover { background: var(--blue-light); color: var(--blue); }

/* HEADER CTA */
.header__cta { display: flex; align-items: center; gap: 16px; }
.header__hotline { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700; }
.header__hotline-icon { width: 32px; height: 32px; background: var(--blue); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.btn-consult {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--yellow-dark), var(--yellow));
  color: var(--black);
  font-size: 13px; font-weight: 800;
  border-radius: 50px;
  border: none; cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-consult:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245,197,24,0.4); }

/* HAMBURGER */
.header__hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.header__hamburger span { display: block; width: 24px; height: 2px; background: var(--black); border-radius: 2px; transition: var(--transition); }

/* MOBILE NAV */
.mobile-nav {
  position: fixed;
  top: 108px; left: 0; right: 0;
  background: var(--white);
  z-index: 999;
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  max-height: calc(100vh - 108px);
  overflow-y: auto;
}
.mobile-nav.open { transform: translateY(0); opacity: 1; pointer-events: all; }
.mobile-nav__link { display: block; padding: 14px 16px; font-size: 15px; font-weight: 700; color: var(--black); border-bottom: 1px solid #eee; }
.mobile-nav__sub { padding: 0 0 0 16px; background: var(--gray-light); }
.mobile-nav__sub-title { font-size: 11px; font-weight: 800; color: var(--gray); text-transform: uppercase; letter-spacing: 1px; padding: 10px 16px 4px; }
.mobile-nav__sub-link { display: block; padding: 10px 16px; font-size: 14px; color: var(--text); border-bottom: 1px solid rgba(0,0,0,0.05); }

/* ===== CONTAINER ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== SECTIONS ===== */
.section { padding: 80px 0; }
.section--dark { background: #0D1117; }
.section__header { text-align: center; margin-bottom: 48px; }
.section__tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 12px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 2px;
  border-radius: 50px;
  margin-bottom: 12px;
}
.section__tag--blue { background: rgba(0,87,168,0.15); color: var(--yellow-light); }
.section__title { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 900; color: var(--black); line-height: 1.2; }
.section__title span { color: var(--blue); }
.section__title--white { color: var(--white); }
.section__title--white span { color: var(--yellow); }
.section__desc { font-size: 15px; color: var(--gray); margin-top: 12px; max-width: 600px; margin-left: auto; margin-right: auto; }
.section__desc--white { color: rgba(255,255,255,0.7); }

/* ===== HERO ===== */
.hero__badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--yellow);
  font-size: 13px; font-weight: 700;
  border-radius: 50px;
  margin-bottom: 20px;
  backdrop-filter: blur(4px);
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero__title span { color: var(--yellow); }
.hero__subtitle { font-size: clamp(1rem, 2vw, 1.2rem); color: rgba(255,255,255,0.9); margin-bottom: 32px; max-width: 600px; line-height: 1.7; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.btn-primary {
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--yellow-dark), var(--yellow));
  color: var(--black);
  font-size: 15px; font-weight: 800;
  border-radius: 50px;
  border: none; cursor: pointer;
  transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(245,197,24,0.5); }
.btn-secondary {
  padding: 14px 28px;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  font-size: 15px; font-weight: 700;
  border-radius: 50px;
  border: 2px solid rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex; align-items: center; gap: 8px;
  backdrop-filter: blur(4px);
}
.btn-secondary:hover { background: rgba(255,255,255,0.25); transform: translateY(-3px); }
.hero__stats { display: flex; gap: 32px; flex-wrap: wrap; }
.hero__stat { text-align: center; }
.hero__stat-number { display: block; font-size: 1.8rem; font-weight: 900; color: var(--yellow); line-height: 1; }
.hero__stat-label { display: block; font-size: 11px; color: rgba(255,255,255,0.7); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== STATS BANNER ===== */
.stats-banner { background: linear-gradient(135deg, var(--blue-dark), var(--blue)); padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; }
.stat-item__number { display: block; font-size: 2.2rem; font-weight: 900; color: var(--yellow); }
.stat-item__label { display: block; font-size: 13px; color: rgba(255,255,255,0.8); margin-top: 4px; }

/* ===== PROJECTS GRID ===== */
.projects-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.project-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.project-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.project-card__img { position: relative; height: 200px; overflow: hidden; }
.project-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.project-card:hover .project-card__img img { transform: scale(1.08); }
.project-card__badge { position: absolute; top: 12px; left: 12px; padding: 4px 12px; background: var(--yellow); color: var(--black); font-size: 11px; font-weight: 800; border-radius: 50px; }
.project-card__badge--blue { background: var(--blue); color: var(--white); }
.project-card__body { padding: 20px; }
.project-card__type { font-size: 11px; font-weight: 700; color: var(--blue); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }
.project-card__name { font-size: 1.05rem; font-weight: 800; color: var(--black); margin-bottom: 8px; }
.project-card__location { font-size: 12px; color: var(--gray); display: flex; align-items: center; gap: 4px; margin-bottom: 12px; }
.project-card__info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 12px; padding: 12px; background: var(--gray-light); border-radius: var(--radius); }
.project-card__info-item { text-align: center; font-size: 11px; color: var(--gray); }
.project-card__info-item strong { display: block; font-size: 13px; color: var(--black); margin-bottom: 2px; }
.project-card__price { font-size: 13px; font-weight: 700; color: var(--blue); margin-bottom: 14px; padding: 8px; background: var(--blue-light); border-radius: var(--radius); text-align: center; }
.project-card__btn { display: block; text-align: center; padding: 10px; background: linear-gradient(135deg, var(--yellow-dark), var(--yellow)); color: var(--black); font-size: 13px; font-weight: 800; border-radius: var(--radius); transition: var(--transition); }
.project-card__btn:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(245,197,24,0.4); }

/* ===== WHY GRID ===== */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.why-card { background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg); padding: 28px 24px; transition: var(--transition); }
.why-card:hover { background: rgba(255,255,255,0.1); transform: translateY(-4px); }
.why-card__icon { font-size: 40px; margin-bottom: 16px; }
.why-card__title { font-size: 1rem; font-weight: 800; color: var(--yellow); margin-bottom: 10px; }
.why-card__desc { font-size: 13.5px; color: rgba(255,255,255,0.75); line-height: 1.7; }

/* ===== NEWS GRID ===== */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card { background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.news-card__img { height: 200px; overflow: hidden; }
.news-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.news-card:hover .news-card__img img { transform: scale(1.06); }
.news-card__body { padding: 20px; }
.news-card__date { font-size: 12px; color: var(--gray); margin-bottom: 8px; }
.news-card__title { font-size: 15px; font-weight: 700; color: var(--black); margin-bottom: 10px; line-height: 1.5; }
.news-card__excerpt { font-size: 13px; color: var(--gray); line-height: 1.6; }

/* ===== CONTACT SECTION ===== */
.contact-section { padding: 80px 0; background: linear-gradient(135deg, #0D1117, #0D2140); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: start; }
.contact-info__title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 900; color: var(--white); margin-bottom: 16px; }
.contact-info__title span { color: var(--yellow); }
.contact-info__desc { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.8; margin-bottom: 28px; }
.contact-detail { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 20px; }
.contact-detail__icon { font-size: 24px; width: 44px; height: 44px; background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-detail__label { font-size: 12px; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.contact-detail__value { font-size: 15px; font-weight: 700; color: var(--white); }
.contact-detail__value a { color: var(--yellow); }

/* FORM */
.contact-form { background: var(--white); border-radius: var(--radius-lg); padding: 36px 32px; box-shadow: var(--shadow-lg); }
.contact-form__title { font-size: 1.1rem; font-weight: 800; color: var(--black); margin-bottom: 24px; padding-bottom: 16px; border-bottom: 2px solid var(--yellow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 700; color: var(--black); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #E5E7EB;
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text);
  transition: var(--transition);
  background: var(--white);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-light); }
.form-group textarea { height: 90px; resize: vertical; }
.btn-submit {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--yellow-dark), var(--yellow));
  color: var(--black);
  font-size: 16px; font-weight: 800;
  border: none; border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 8px;
}
.btn-submit:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(245,197,24,0.5); }
.btn-submit:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

/* ===== FOOTER ===== */
.footer { background: #0A0A0A; padding: 60px 0 0; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; padding-bottom: 40px; }
.footer__logo img { height: 48px; width: auto; margin-bottom: 16px; }
.footer__desc { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.8; }
.footer__socials { display: flex; gap: 10px; margin-top: 16px; }
.footer__social { width: 36px; height: 36px; background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; transition: var(--transition); }
.footer__social:hover { background: var(--yellow); }
.footer__col-title { font-size: 13px; font-weight: 800; color: var(--white); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 2px solid var(--yellow); }
.footer__links { display: flex; flex-direction: column; gap: 8px; }
.footer__link { font-size: 13px; color: rgba(255,255,255,0.55); transition: var(--transition); }
.footer__link:hover { color: var(--yellow); }
.footer__bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }
.footer__copyright { font-size: 12px; color: rgba(255,255,255,0.35); }
.footer__bottom-links { display: flex; gap: 20px; }
.footer__bottom-link { font-size: 12px; color: rgba(255,255,255,0.35); transition: var(--transition); }
.footer__bottom-link:hover { color: var(--yellow); }

/* ===== FLOATING BUTTONS ===== */
.floating-btns { position: fixed; bottom: 28px; right: 20px; display: flex; flex-direction: column; gap: 12px; z-index: 500; }
.float-btn {
  width: 52px; height: 52px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}
.float-btn:hover { transform: scale(1.1); }
.float-btn--call { background: linear-gradient(135deg, #27AE60, #2ECC71); }
.float-btn--zalo { background: linear-gradient(135deg, #0057A8, #0068FF); }
.float-btn--top { background: var(--yellow); transition: opacity 0.3s ease, transform 0.3s ease; }

/* ===== MODAL ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 2000; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: var(--transition); }
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal { background: var(--white); border-radius: var(--radius-lg); padding: 48px 40px; text-align: center; max-width: 420px; width: 90%; box-shadow: var(--shadow-lg); }
.modal__icon { width: 72px; height: 72px; background: linear-gradient(135deg, #27AE60, #2ECC71); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 32px; color: white; margin: 0 auto 20px; font-weight: 900; }
.modal__title { font-size: 1.4rem; font-weight: 900; color: var(--black); margin-bottom: 12px; }
.modal__desc { font-size: 14px; color: var(--gray); line-height: 1.7; margin-bottom: 24px; }
.modal__close { padding: 12px 32px; background: var(--blue); color: white; font-size: 14px; font-weight: 700; border: none; border-radius: 50px; cursor: pointer; transition: var(--transition); }
.modal__close:hover { background: var(--blue-dark); }

/* ===== SCROLL ANIMATIONS ===== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1200px) {
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1024px) {
  .header__nav { display: none; }
  .header__cta { display: none; }
  .header__hamburger { display: flex; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .projects-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 20px; }
  .hero__stat-number { font-size: 1.4rem; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px 20px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero__actions { flex-direction: column; }
  .btn-primary, .btn-secondary { text-align: center; justify-content: center; }
}