/* 
  =========================================
  WEBSITE DOANH NGHIỆP - PREMIUM STYLING
  Author: Antigravity Front-End Developer
  =========================================
*/

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* --- Reset & Variables --- */
:root {
  --font-primary: 'Outfit', sans-serif;
  
  /* Color Palette - Premium Corporate (Slate & Sky Blue & Gold Accent) */
  --color-primary: #0f172a;        /* Deep Slate Blue */
  --color-primary-light: #1e293b;  /* Lighter Slate Blue */
  --color-secondary: #0284c7;      /* Sky Blue Accent */
  --color-secondary-hover: #0369a1;/* Darker Sky Blue */
  --color-accent: #f59e0b;         /* Amber Accent (Gold) */
  --color-accent-hover: #d97706;   /* Darker Amber */
  --color-bg-light: #f8fafc;       /* Clean Light Neutral */
  --color-bg-white: #ffffff;       /* Pure White */
  --color-text-dark: #1e293b;      /* Dark Slate for typography */
  --color-text-muted: #64748b;     /* Muted Grey */
  --color-border: #e2e8f0;         /* Light Grey Border */
  --color-success: #10b981;        /* Emerald Green */
  --color-error: #ef4444;          /* Soft Red */
  
  /* Shadows & Radius */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Container width */
  --max-width: 1280px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-light);
  color: var(--color-text-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; position: relative; margin-bottom: 2.5rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--color-secondary-hover);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-bg {
  background-color: var(--color-bg-white);
}

.section-title-wrapper {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem auto;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  margin: 0.75rem auto 0 auto;
  border-radius: var(--radius-full);
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .section { padding: 3.5rem 0; }
}

/* --- Components & UI --- */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-bg-white);
}

.btn-primary:hover {
  background-color: var(--color-secondary-hover);
  color: var(--color-bg-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-bg-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

.btn-accent:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-dark);
}

.btn-outline:hover {
  background-color: var(--color-bg-light);
  border-color: var(--color-text-dark);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* Header & Navigation (Injected by JS) */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition-normal);
}

header.scrolled {
  padding: 0.5rem 0;
  box-shadow: var(--shadow-lg);
  background-color: rgba(15, 23, 42, 0.98);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  transition: var(--transition-normal);
}

header.scrolled .header-container {
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-bg-white);
}

.logo-dot {
  color: var(--color-secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: #cbd5e1;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.25rem;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-bg-white);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-secondary);
  transition: var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* Dropdown Menu */
.nav-item-dropdown {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background-color: var(--color-primary);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  min-width: 200px;
  padding: 0.75rem 0;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-fast);
  z-index: 100;
}

.nav-item-dropdown:hover .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-link {
  display: block;
  padding: 0.5rem 1.25rem;
  color: #cbd5e1;
  font-size: 0.9rem;
  font-weight: 500;
}

.dropdown-link:hover {
  background-color: rgba(255,255,255,0.05);
  color: var(--color-bg-white);
  padding-left: 1.5rem;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-bg-white);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 992px) {
  .mobile-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--color-primary);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem;
    gap: 1.5rem;
    overflow-y: auto;
    transition: var(--transition-normal);
  }
  
  header.scrolled .nav-menu {
    top: 64px;
    height: calc(100vh - 64px);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-item-dropdown {
    width: 100%;
  }
  
  .nav-dropdown {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    box-shadow: none;
    background-color: rgba(255,255,255,0.03);
    border: none;
    margin-top: 0.5rem;
    width: 100%;
  }
  
  .nav-item-dropdown:hover .nav-dropdown {
    transform: none;
  }
}

/* Footer (Injected by JS) */
footer {
  background-color: var(--color-primary);
  color: #cbd5e1;
  padding: 5rem 0 2rem 0;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-info .logo {
  margin-bottom: 1.25rem;
}

.footer-info p {
  color: #94a3b8;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.footer-socials {
  display: flex;
  gap: 1rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255,255,255,0.05);
  border-radius: var(--radius-full);
  color: var(--color-bg-white);
  transition: var(--transition-fast);
}

.social-btn:hover {
  background-color: var(--color-secondary);
  transform: translateY(-3px);
}

.footer-title {
  color: var(--color-bg-white);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  position: relative;
}

.footer-title::after {
  content: '';
  display: block;
  width: 30px;
  height: 2px;
  background-color: var(--color-secondary);
  margin-top: 0.5rem;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: #94a3b8;
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--color-bg-white);
  padding-left: 0.25rem;
}

.footer-newsletter p {
  font-size: 0.95rem;
  color: #94a3b8;
  margin-bottom: 1.25rem;
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
}

.newsletter-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.15);
  background-color: rgba(255,255,255,0.05);
  color: var(--color-bg-white);
  font-family: var(--font-primary);
  outline: none;
}

.newsletter-form input::placeholder {
  color: #64748b;
}

.newsletter-form input:focus {
  border-color: var(--color-secondary);
}

.newsletter-form button {
  background-color: var(--color-secondary);
  border: none;
  color: var(--color-bg-white);
  width: 50px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.newsletter-form button:hover {
  background-color: var(--color-secondary-hover);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #64748b;
}

@media (max-width: 768px) {
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Breadcrumb Header */
.breadcrumb-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  padding: 8rem 0 4rem 0;
  text-align: center;
  color: var(--color-bg-white);
}

.breadcrumb-hero h1 {
  color: var(--color-bg-white);
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
}

.breadcrumbs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: #94a3b8;
}

.breadcrumbs a {
  color: #cbd5e1;
}

.breadcrumbs a:hover {
  color: var(--color-bg-white);
}

.breadcrumbs span {
  color: var(--color-secondary);
  font-weight: 500;
}

/* --- Content Cards --- */

/* Product & Project Cards */
.card {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
  border: 1px solid var(--color-border);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(2, 132, 199, 0.3);
}

.card-img-wrapper {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  background-color: #cbd5e1;
}

.card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-slow);
}

.card:hover .card-img-wrapper img {
  transform: scale(1.08);
}

.card-content {
  padding: 1.5rem;
}

.card-tag {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--color-secondary);
  background-color: rgba(2, 132, 199, 0.08);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.card-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  transition: var(--transition-fast);
}

.card-title a {
  color: var(--color-primary);
}

.card-title a:hover {
  color: var(--color-secondary);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.card-price {
  font-weight: 700;
  color: var(--color-secondary);
}

/* Back to Top */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--color-secondary);
  color: var(--color-bg-white);
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
  z-index: 999;
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
}

#back-to-top:hover {
  background-color: var(--color-secondary-hover);
  transform: translateY(-3px);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Lightbox styles */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15,23,42,0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-normal);
  z-index: 2000;
}

.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 85%;
  transform: scale(0.9);
  transition: var(--transition-normal);
}

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

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xl);
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: var(--color-bg-white);
  font-size: 2rem;
  cursor: pointer;
}

.lightbox-caption {
  color: #cbd5e1;
  text-align: center;
  margin-top: 1rem;
  font-size: 1.1rem;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(255,255,255,0.1);
  border: none;
  color: var(--color-bg-white);
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.lightbox-prev { left: -70px; }
.lightbox-next { right: -70px; }
.lightbox-nav:hover { background-color: var(--color-secondary); }

@media (max-width: 768px) {
  .lightbox-prev { left: 10px; }
  .lightbox-next { right: 10px; }
}