/* ==========================================================================
   Tech24h.vn — Corporate & App Portal Global Stylesheet
   Modern, responsive, high-performance styling
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,600&display=swap');

:root {
  /* Brand Palette */
  --primary: #4F46E5;
  --primary-light: #EEF2FF;
  --primary-dark: #3730A3;
  --accent-purple: #7C3AED;
  --accent-cyan: #06B6D4;
  --accent-coral: #FF7B90;

  /* Surfaces & Backgrounds */
  --bg-main: #FAFBFC;
  --bg-card: #FFFFFF;
  --bg-dark: #0B0F19;
  --bg-dark-card: #151D2F;
  --bg-surface-elevated: #FFFFFF;

  /* Text Colors */
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --text-light: #F8FAFC;

  /* Borders & Shadows */
  --border-light: #E2E8F0;
  --border-dark: #1E293B;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 12px 36px rgba(79, 70, 229, 0.2);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Layout */
  --max-width: 1200px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--text-primary);
  background-color: var(--bg-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

ul {
  list-style: none;
}

button, input, textarea {
  font-family: inherit;
  border: none;
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-primary);
}

.brand-logo img {
  height: 40px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-toggle {
  display: none;
  background: transparent;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

.mobile-toggle svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  color: #FFFFFF;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(79, 70, 229, 0.3);
  color: #FFFFFF;
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: #F8FAFC;
  border-color: #CBD5E1;
  transform: translateY(-2px);
}

.btn-coral {
  background: linear-gradient(135deg, #FF7B90 0%, #FF5A73 100%);
  color: #FFFFFF;
  box-shadow: 0 10px 24px rgba(255, 123, 144, 0.3);
}

.btn-coral:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(255, 123, 144, 0.4);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-brand {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.badge-coral {
  background: rgba(255, 123, 144, 0.12);
  color: #FF5A73;
}

.badge-success {
  background: #ECFDF5;
  color: #059669;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 100px;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 10% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 40%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 60px;
}

.hero-content {
  max-width: 600px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  margin: 20px 0;
  color: var(--text-primary);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 50%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.stat-item h4 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
}

.stat-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Hero Visual Showcase */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.hero-card-preview {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  animation: floatSubtle 6s ease-in-out infinite;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.hero-app-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.08);
}

.hero-card-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

.hero-card-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.metric-pill {
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 12px 10px;
  text-align: center;
}

.metric-pill .val {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  display: block;
}

.metric-pill .label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Floating interactive badges */
.floating-badge {
  position: absolute;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  padding: 12px 18px;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 10;
  animation: floatBadge 5s ease-in-out infinite;
}

.floating-badge.badge-top-left {
  top: -20px;
  left: -20px;
}

.floating-badge.badge-bottom-right {
  bottom: -20px;
  right: -20px;
  animation-delay: -2.5s;
}

.badge-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

/* ==========================================================================
   Section Layouts
   ========================================================================== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-light {
  background-color: #FFFFFF;
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-light);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin: 16px 0;
  line-height: 1.25;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.section-dark .section-header p {
  color: var(--text-muted);
}

/* ==========================================================================
   App Showcase Cards
   ========================================================================== */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 32px;
}

.app-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.app-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(79, 70, 229, 0.3);
}

.app-card-hero {
  padding: 36px 32px;
  background: linear-gradient(135deg, #FFF5F7 0%, #FFFBF9 100%);
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid #F8ECEE;
}

.app-card-icon {
  width: 76px;
  height: 76px;
  border-radius: 20px;
  box-shadow: 0 10px 24px rgba(255, 123, 144, 0.25);
  flex-shrink: 0;
}

.app-card-info h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.app-card-info .tagline {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.app-card-body {
  padding: 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app-features-list {
  margin: 20px 0 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.app-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.app-features-list li svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: #10B981;
  margin-top: 2px;
}

.app-card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
}

/* Coming Soon App Card */
.app-card-coming-soon {
  background: #F8FAFC;
  border: 2px dashed #CBD5E1;
  box-shadow: none;
  opacity: 0.9;
}

.app-card-coming-soon:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--primary);
}

/* ==========================================================================
   Company Values & Features
   ========================================================================== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.value-card {
  background: var(--bg-card);
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.value-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.value-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.value-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ==========================================================================
   Contact Section & Form
   ========================================================================== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 50px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
}

.contact-info h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1rem;
}

.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.channel-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.channel-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.channel-text strong {
  display: block;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.channel-text span, .channel-text a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.channel-text a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: var(--transition);
}

.form-control:focus {
  background: #FFFFFF;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-muted);
  padding: 80px 0 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand h4 {
  font-size: 1.4rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-muted);
  max-width: 320px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-col h5 {
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes floatSubtle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes floatBadge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Scroll reveal helper */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Notification toast */
.top-toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(16px);
  color: #FFFFFF;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  z-index: 99999;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.top-toast.show {
  transform: translateX(-50%) translateY(0);
}

.top-toast-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10B981;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-content {
    max-width: 100%;
    margin: 0 auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-stats {
    justify-content: center;
  }
  .contact-wrapper {
    grid-template-columns: 1fr;
    padding: 36px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .nav-menu {
    position: fixed;
    top: 76px;
    left: 0;
    width: 100%;
    background: #FFFFFF;
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    box-shadow: var(--shadow-md);
    transform: translateY(-150%);
    transition: var(--transition);
  }
  .nav-menu.open {
    transform: translateY(0);
  }
  .mobile-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}