/* ==========================================================================
   IT CONNECT (suamayvitinh.vn) - MODERN SEO DESIGN SYSTEM
   ========================================================================== */

:root {
  /* Brand Palette */
  --primary: #0284c7;         /* Sky 600 - Dynamic modern tech blue */
  --primary-dark: #0369a1;    /* Sky 700 */
  --primary-darker: #0c4a6e;  /* Sky 900 */
  --primary-light: #e0f2fe;   /* Sky 100 */
  --primary-subtle: #f0f9ff;  /* Sky 50 */
  
  --accent: #06b6d4;          /* Cyan 500 */
  --accent-hover: #0891b2;    /* Cyan 600 */
  --accent-light: #ecfeff;    /* Cyan 50 */
  
  --secondary: #2563eb;       /* Blue 600 */
  --success: #10b981;         /* Emerald 500 */
  --success-light: #ecfdf5;
  --warning: #f59e0b;         /* Amber 500 */
  --danger: #ef4444;          /* Red 500 */

  /* Neutral Shades */
  --bg-body: #ffffff;
  --bg-surface: #f8fafc;     /* Slate 50 */
  --bg-surface-2: #f1f5f9;   /* Slate 100 */
  --bg-dark: #0f172a;        /* Slate 900 */
  --bg-dark-surface: #1e293b;/* Slate 800 */
  --bg-dark-card: #334155;   /* Slate 700 */

  --text-main: #1e293b;      /* Slate 800 */
  --text-muted: #64748b;     /* Slate 500 */
  --text-light: #94a3b8;     /* Slate 400 */
  --text-inverse: #ffffff;
  --text-inverse-muted: #cbd5e1;

  --border-color: #e2e8f0;    /* Slate 200 */
  --border-color-dark: #334155;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.25);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1240px;
  --header-height: 76px;
  --topbar-height: 40px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-body);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img, svg, picture, video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 3.8vw, 2.75rem); letter-spacing: -0.025em; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.25rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); letter-spacing: -0.01em; }
h4 { font-size: 1.15rem; font-weight: 600; }
h5 { font-size: 1rem; font-weight: 600; }

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}
p:last-child {
  margin-bottom: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.section {
  padding: 5rem 0;
  position: relative;
}

.section-sm {
  padding: 3rem 0;
}

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

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
}
.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--text-inverse);
}
.section-dark p {
  color: var(--text-inverse-muted);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 3.5rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background-color: var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.section-tag.dark {
  background: rgba(2, 132, 199, 0.2);
  color: var(--accent);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.section-title {
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.125rem;
  line-height: 1.6;
}

/* Grid System */
.grid {
  display: grid;
  gap: 1.75rem;
}

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

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 992px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.8rem 1.6rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-darker) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
  color: #ffffff;
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent) 0%, #0891b2 100%);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.35);
}
.btn-accent:hover {
  background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.45);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--bg-surface-2);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background-color: var(--border-color);
  color: var(--primary-dark);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.7);
}
.btn-outline-white:hover {
  background-color: #ffffff;
  color: var(--bg-dark);
  border-color: #ffffff;
}

.btn-hotline {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.35);
  animation: pulse-light 2.5s infinite;
}
.btn-hotline:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  transform: translateY(-2px);
  color: #ffffff;
}

@keyframes pulse-light {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
}

/* Header & Topbar */
.topbar {
  background-color: var(--bg-dark);
  color: var(--text-inverse-muted);
  font-size: 0.85rem;
  height: var(--topbar-height);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
}

.topbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-inverse-muted);
}
.topbar-item:hover {
  color: var(--accent);
}
.topbar-item strong {
  color: #ffffff;
}

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo-wrap {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.3rem;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-darker);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.brand-name span {
  color: var(--primary);
}

.brand-tagline {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

/* Nav Menu */
.nav-menu {
  display: none;
  align-items: center;
  gap: 0.25rem;
}

@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem 0.9rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary);
  background-color: var(--primary-subtle);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 700;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 270px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 0.6rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: background-color var(--transition-fast);
}

.nav-dropdown-item:hover {
  background-color: var(--primary-subtle);
  color: var(--primary-dark);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  background-color: var(--bg-surface);
}

@media (min-width: 1024px) {
  .mobile-toggle {
    display: none;
  }
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 85%;
  max-width: 380px;
  height: 100%;
  background-color: #ffffff;
  z-index: 999;
  box-shadow: var(--shadow-xl);
  padding: 1.5rem;
  overflow-y: auto;
  transition: right var(--transition-slow);
  display: flex;
  flex-direction: column;
}

.mobile-drawer.open {
  right: 0;
}

.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.drawer-nav .nav-link {
  padding: 0.8rem 1rem;
  font-size: 1rem;
  border-radius: var(--radius-md);
  border-bottom: 1px solid var(--bg-surface);
}

/* Footer */
.footer {
  background-color: var(--bg-dark);
  color: var(--text-inverse-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: auto;
}

.footer-top {
  padding: 4.5rem 0 3rem 0;
}

.footer-brand p {
  color: var(--text-inverse-muted);
  margin-top: 1rem;
  font-size: 0.92rem;
  line-height: 1.6;
}

.footer-title {
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.6rem;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links a {
  color: var(--text-inverse-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.footer-contact-item svg {
  flex-shrink: 0;
  color: var(--accent);
  margin-top: 3px;
}

.footer-bottom {
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  text-align: center;
}

.footer-bottom .container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 768px) {
  .footer-bottom .container {
    flex-direction: row;
  }
}

/* Breadcrumbs */
.breadcrumb-wrap {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
  font-size: 0.875rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  color: var(--text-muted);
}

.breadcrumbs a {
  color: var(--text-muted);
}
.breadcrumbs a:hover {
  color: var(--primary);
}

.breadcrumbs .separator {
  color: var(--text-light);
  font-size: 0.8rem;
}

.breadcrumbs .current {
  color: var(--primary-dark);
  font-weight: 600;
}

/* Floating Actions */
.floating-actions {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  z-index: 900;
}

.floating-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  text-decoration: none;
}

.floating-btn:hover {
  transform: scale(1.12);
  color: #ffffff;
}

/* Zalo Floating Button with Blinking & Pulsing Waves */
.floating-btn.zalo {
  background: #0068ff;
  box-shadow: 0 4px 20px rgba(0, 104, 255, 0.45);
  animation: zalo-blink 2s infinite ease-in-out;
}

@keyframes zalo-blink {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.7);
  }
  30% {
    transform: scale(1.1);
    box-shadow: 0 0 0 14px rgba(0, 104, 255, 0);
  }
  60% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0);
  }
}

.zalo-pulse-ring {
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  border: 2px solid #0068ff;
  animation: zalo-wave 2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
  pointer-events: none;
}

.zalo-pulse-ring-2 {
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  border-radius: 50%;
  border: 2px solid rgba(0, 104, 255, 0.5);
  animation: zalo-wave 2s cubic-bezier(0.24, 0, 0.38, 1) 0.5s infinite;
  pointer-events: none;
}

@keyframes zalo-wave {
  0% {
    transform: scale(0.9);
    opacity: 0.9;
  }
  70% {
    transform: scale(1.4);
    opacity: 0;
  }
  100% {
    transform: scale(1.45);
    opacity: 0;
  }
}

.floating-btn.hotline {
  background: #ef4444;
  animation: pulse-light 2.2s infinite;
}

.floating-tooltip {
  position: absolute;
  right: 68px;
  background-color: #0f172a;
  color: #ffffff;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateX(6px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.floating-btn:hover .floating-tooltip {
  opacity: 1;
  transform: translateX(0);
}