/* ==========================================================================
   LANDING PAGE CATALOGUE LỊCH BÌNH MINH 2027 - DESIGN SYSTEM & STYLES
   ========================================================================== */

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

:root {
  /* Color Palette - Premium Corporate Tết (Gold & Imperial Crimson) */
  --bg-dark: #0b0d14;
  --bg-card: #141824;
  --bg-card-hover: #1c2234;
  --bg-glass: rgba(20, 24, 36, 0.75);
  
  --primary-red: #d92534;
  --primary-red-hover: #f03242;
  --primary-red-glow: rgba(217, 37, 52, 0.4);

  --accent-gold: #f4be38;
  --accent-gold-light: #ffe596;
  --accent-gold-dark: #c49013;
  --gold-gradient: linear-gradient(135deg, #ffe596 0%, #f4be38 50%, #c49013 100%);
  --red-gradient: linear-gradient(135deg, #ff4d5a 0%, #d92534 60%, #9e111d 100%);
  
  --text-main: #f0f3f9;
  --text-muted: #9aa4bf;
  --text-dark: #0b0d14;
  
  --border-color: rgba(244, 190, 56, 0.2);
  --border-subtle: rgba(255, 255, 255, 0.08);

  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.5);
  --shadow-gold: 0 8px 30px rgba(244, 190, 56, 0.25);
  --shadow-red: 0 8px 30px rgba(217, 37, 52, 0.3);

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

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

/* Background Atmosphere Orbs */
body::before {
  content: '';
  position: fixed;
  top: -10vw;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(217, 37, 52, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  bottom: -10vw;
  right: -10vw;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(244, 190, 56, 0.12) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
  z-index: 0;
}

/* Typography Utilities */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
}

.text-gold-gradient {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-red-gradient {
  background: var(--red-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 96px 0;
  position: relative;
  z-index: 1;
}

/* Header & Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-badge {
  background: var(--red-gradient);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.2rem;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-red);
  letter-spacing: 1px;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.logo-text span {
  color: var(--accent-gold);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gold-gradient);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--red-gradient);
  color: #fff;
  box-shadow: var(--shadow-red);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(217, 37, 52, 0.5);
  background: linear-gradient(135deg, #ff606b 0%, #e62e3d 60%, #b31623 100%);
}

.btn-gold {
  background: var(--gold-gradient);
  color: var(--text-dark);
  box-shadow: var(--shadow-gold);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(244, 190, 56, 0.4);
  filter: brightness(1.08);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  background: rgba(244, 190, 56, 0.1);
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  padding-top: 140px;
  padding-bottom: 80px;
  display: flex;
  align-items: center;
  background: radial-gradient(circle at 70% 30%, rgba(217, 37, 52, 0.12) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(244, 190, 56, 0.1);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--accent-gold);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.stat-item h4 {
  font-size: 2.2rem;
  color: var(--accent-gold);
  font-weight: 800;
}

.stat-item p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hero-preview-card {
  position: relative;
  border-radius: var(--radius-lg);
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.hero-preview-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(244, 190, 56, 0.15), transparent 50%);
  pointer-events: none;
}

.hero-preview-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.hero-preview-card:hover .hero-preview-img {
  transform: scale(1.02);
}

.hero-badge-floating {
  position: absolute;
  bottom: 30px;
  left: 30px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
}

.badge-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--red-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
}

/* Section Titles */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px auto;
}

.section-subtitle {
  color: var(--accent-gold);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Feature Grid / Strengths */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 32px 24px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(244, 190, 56, 0.1);
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}

.feature-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: #fff;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Interactive Catalogue Gallery */
.catalogue-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 36px;
  background: var(--bg-card);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: var(--gold-gradient);
  color: var(--text-dark);
  box-shadow: var(--shadow-gold);
}

.search-box {
  position: relative;
  min-width: 240px;
}

.search-input {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-subtle);
  color: #fff;
  padding: 10px 16px 10px 40px;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.search-input:focus {
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(244, 190, 56, 0.15);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.gallery-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.gallery-card:hover {
  transform: translateY(-6px) scale(1.01);
  border-color: var(--border-color);
  box-shadow: var(--shadow-lg);
}

.gallery-img-wrapper {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: #000;
}

.gallery-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-card:hover .gallery-img {
  transform: scale(1.06);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 13, 20, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  opacity: 0;
  transition: var(--transition);
}

.gallery-card:hover .gallery-overlay {
  opacity: 1;
}

.gallery-card-info {
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-number-tag {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--accent-gold);
  font-size: 0.95rem;
}

.category-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.06);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 48px;
}

.page-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.page-btn:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.page-btn.active {
  background: var(--gold-gradient);
  color: var(--text-dark);
  border-color: transparent;
}

/* B2B Price & Discount Estimator Tool */
.calculator-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  position: relative;
  overflow: hidden;
}

.calculator-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gold-gradient);
}

.calc-inputs {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border-subtle);
  color: #fff;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--accent-gold);
  box-shadow: 0 0 0 3px rgba(244, 190, 56, 0.15);
}

.calc-results {
  background: var(--bg-dark);
  border-radius: var(--radius-md);
  padding: 32px;
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.calc-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.calc-row:last-child {
  border-bottom: none;
}

.calc-val-discount {
  color: #4ade80;
  font-weight: 700;
  font-size: 1.1rem;
}

.calc-val-total {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-gold);
  font-family: var(--font-heading);
}

/* Workflow Section */
.workflow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gold-gradient);
  color: var(--text-dark);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  box-shadow: var(--shadow-gold);
}

.step-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Lightbox Modal Bulletproof Positioning */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 12, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.modal-close-btn {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 100000;
  background: var(--red-gradient);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-red);
  transition: var(--transition);
}

.modal-close-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(217, 37, 52, 0.6);
}

.modal-nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 100000;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(20, 24, 36, 0.85);
  border: 2px solid var(--accent-gold);
  color: var(--accent-gold);
  font-size: 1.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.modal-nav-btn:hover {
  background: var(--gold-gradient);
  color: var(--text-dark);
  transform: translateY(-50%) scale(1.1);
}

.modal-prev-btn { left: 32px; }
.modal-next-btn { right: 32px; }

.modal-box {
  position: relative;
  max-width: 85vw;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 99999;
}

.modal-img {
  max-width: 80vw;
  max-height: 72vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.95);
  cursor: pointer;
  transition: transform 0.2s ease;
}

.modal-img:hover {
  transform: scale(1.01);
}

.modal-caption {
  margin-top: 16px;
  color: var(--accent-gold);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  text-align: center;
  background: rgba(20, 24, 36, 0.8);
  padding: 8px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

@media (max-width: 768px) {
  .modal-prev-btn { left: 12px; width: 48px; height: 48px; font-size: 1.4rem; }
  .modal-next-btn { right: 12px; width: 48px; height: 48px; font-size: 1.4rem; }
  .modal-close-btn { top: 16px; right: 16px; padding: 8px 16px; font-size: 0.9rem; }
}

/* Floating Action Bar / Zalo */
.floating-actions {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.float-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  position: relative;
}

.float-btn:hover {
  transform: scale(1.1);
}

.float-zalo {
  background: #0068ff;
  border: 2px solid rgba(255,255,255,0.3);
}

.float-call {
  background: var(--red-gradient);
  border: 2px solid rgba(255,255,255,0.3);
}

/* Footer */
footer {
  background: #07080d;
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-desc {
  color: var(--text-muted);
  margin-top: 16px;
  font-size: 0.9rem;
  max-width: 360px;
}

.footer-col h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent-gold);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid, .workflow-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .calculator-box {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .features-grid, .workflow-steps {
    grid-template-columns: 1fr;
  }
  .catalogue-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .modal-prev { left: 10px; }
  .modal-next { right: 10px; }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}