/* ==========================================================================
   OfficeBox Combo Box - Flagship Landing Page Styles
   Inspirations: Dribbble E-Bike Showcase & Framer Motion
   Theme: Dark Obsidian with OfficeBox Vibrant Orange (#ff6700)
   ========================================================================== */

:root {
  --color-primary: #ff6700;
  --color-primary-hover: #ff5500;
  --color-primary-glow: rgba(255, 103, 0, 0.45);
  --color-primary-subtle: rgba(255, 103, 0, 0.12);
  --color-accent: #ff8533;
  --color-accent-amber: #f59e0b;

  --color-bg: #070b14;
  --color-bg-secondary: #0c1220;
  --color-surface: rgba(15, 23, 42, 0.65);
  --color-surface-hover: rgba(30, 41, 59, 0.85);
  --color-surface-active: rgba(255, 103, 0, 0.08);

  --color-border: rgba(255, 255, 255, 0.09);
  --color-border-glow: rgba(255, 103, 0, 0.35);

  --color-text: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 35px rgba(255, 103, 0, 0.3);
  --shadow-glow-lg: 0 0 60px rgba(255, 103, 0, 0.45);

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
}

body {
  position: relative;
  background-color: var(--color-bg);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Background Ambient Lighting (E-Bike Showcase Glow) */
.ambient-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-glow::before {
  content: '';
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(ellipse at center, rgba(255, 103, 0, 0.18) 0%, rgba(255, 103, 0, 0.04) 50%, transparent 75%);
  filter: blur(80px);
}

.ambient-glow::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 103, 0, 0.12) 0%, transparent 70%);
  filter: blur(100px);
}

/* Subtle Grid Background Pattern */
.grid-pattern {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: 0;
}

/* Global Container */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   1. NAVIGATION BAR (Glassmorphic Sticky Nav)
   ========================================================================== */
.combo-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(7, 11, 20, 0.75);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-normal);
}

.combo-nav.scrolled {
  background: rgba(7, 11, 20, 0.92);
  border-bottom-color: rgba(255, 103, 0, 0.2);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), #e05500);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
  box-shadow: 0 0 16px var(--color-primary-glow);
}

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

.brand-title {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title span {
  color: var(--color-primary);
}

.brand-badge {
  font-size: 10px;
  font-weight: 700;
  background: rgba(255, 103, 0, 0.15);
  color: var(--color-primary);
  border: 1px solid rgba(255, 103, 0, 0.3);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.brand-slogan {
  font-size: 11px;
  color: var(--color-text-secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

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

.nav-hotline {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: var(--transition-fast);
}

.nav-hotline i {
  color: var(--color-primary);
}

.nav-hotline:hover {
  border-color: var(--color-primary);
  background: rgba(255, 103, 0, 0.1);
  transform: translateY(-1px);
}

.btn-cta-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #ea580c 100%);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 20px var(--color-primary-glow);
  transition: var(--transition-normal);
  border: none;
  cursor: pointer;
}

.btn-cta-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(255, 103, 0, 0.6);
  filter: brightness(1.08);
}

/* ==========================================================================
   2. HERO SHOWCASE (Dribbble E-Bike Style + 3D Tilt Stage)
   ========================================================================== */
.hero-showcase {
  padding: 70px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 103, 0, 0.1);
  border: 1px solid rgba(255, 103, 0, 0.3);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  box-shadow: 0 0 20px rgba(255, 103, 0, 0.15);
}

.hero-pill-badge .dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 50%;
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.6); opacity: 0.5; }
}

.hero-header {
  text-align: center;
  max-width: 960px;
  margin: 0 auto 50px;
}

.hero-title {
  font-size: clamp(34px, 5.5vw, 64px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  color: #fff;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, var(--color-primary) 70%, #ff944d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: clamp(15px, 1.8vw, 19px);
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #ea580c 100%);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  padding: 15px 32px;
  border-radius: var(--radius-full);
  box-shadow: 0 8px 30px var(--color-primary-glow);
  transition: var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
}

.btn-primary-hero:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 40px rgba(255, 103, 0, 0.6);
}

.btn-secondary-hero {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(10px);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  padding: 15px 28px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  transition: var(--transition-normal);
  cursor: pointer;
}

.btn-secondary-hero:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* 3D Showcase Stage */
.stage-container {
  margin-top: 30px;
  position: relative;
  perspective: 1400px;
}

.stage-card {
  position: relative;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  background: radial-gradient(ellipse at 50% 30%, rgba(30, 41, 59, 0.7) 0%, rgba(11, 17, 32, 0.95) 80%);
  border: 1px solid var(--color-border);
  padding: 40px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transform-style: preserve-3d;
  transition: transform 0.15s ease-out;
}

.stage-light-orb {
  position: absolute;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(255, 103, 0, 0.35) 0%, transparent 65%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  filter: blur(40px);
  pointer-events: none;
  z-index: 0;
}

.stage-inner-flex {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 40px;
}

.stage-image-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  transform: translateZ(40px);
}

.stage-image-wrapper img {
  width: 100%;
  max-width: 520px;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.stage-image-wrapper:hover img {
  transform: scale(1.03);
}

/* Hotspot Pins (E-Bike Tech Callouts) */
.hotspot-pin {
  position: absolute;
  width: 32px;
  height: 32px;
  background: rgba(255, 103, 0, 0.25);
  border: 2px solid #ff6700;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  box-shadow: 0 0 20px var(--color-primary-glow);
  z-index: 10;
  transition: transform 0.25s ease, background-color 0.25s ease;
  animation: pulse-hotspot 2.5s infinite;
}

.hotspot-pin:hover {
  transform: scale(1.25);
  background: #ff6700;
}

@keyframes pulse-hotspot {
  0% { box-shadow: 0 0 0 0 rgba(255, 103, 0, 0.6); }
  70% { box-shadow: 0 0 0 16px rgba(255, 103, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 103, 0, 0); }
}

.hotspot-pin .pin-tooltip {
  position: absolute;
  bottom: 42px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border-glow);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  width: 220px;
  font-size: 12px;
  line-height: 1.4;
  color: #fff;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
  text-align: left;
}

.hotspot-pin:hover .pin-tooltip {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.pin-tooltip strong {
  display: block;
  color: var(--color-primary);
  margin-bottom: 2px;
  font-size: 13px;
}

/* Hotspot Coordinates on Box */
.pin-seal { top: 18%; left: 45%; }
.pin-box { bottom: 25%; left: 20%; }
.pin-brands { top: 38%; right: 18%; }
.pin-qr { bottom: 15%; right: 28%; }

/* Stage Info Column */
.stage-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
  transform: translateZ(30px);
}

.stage-badge-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.spec-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  color: #e2e8f0;
}

.spec-badge i {
  color: var(--color-primary);
}

.stage-headline {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.8px;
}

.stage-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stage-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.bullet-icon {
  width: 22px;
  height: 22px;
  background: rgba(255, 103, 0, 0.15);
  border: 1px solid rgba(255, 103, 0, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 10px;
  margin-top: 2px;
  flex-shrink: 0;
}

.stage-pricing-box {
  background: rgba(255, 103, 0, 0.08);
  border: 1px solid rgba(255, 103, 0, 0.25);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.price-desc {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.price-main {
  font-size: 26px;
  font-weight: 800;
  color: #fff;
}

.price-main span {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   3. FOUR COMBO TIERS (Selector / E-Bike Trim Levels)
   ========================================================================== */
.section-combos {
  padding: 100px 0;
  position: relative;
}

.section-tag {
  text-align: center;
  font-size: 12px;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-heading {
  text-align: center;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-subheading {
  text-align: center;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0 auto 50px;
  font-size: 16px;
}

/* Combo Tab Selector */
.combo-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.combo-tab-btn {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 8px;
}

.combo-tab-btn:hover {
  color: #fff;
  border-color: rgba(255, 103, 0, 0.4);
}

.combo-tab-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

/* Combo Grid Cards */
.combo-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.combo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  backdrop-filter: blur(10px);
}

.combo-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-border-glow);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(255, 103, 0, 0.2);
}

.combo-card.featured {
  background: linear-gradient(180deg, rgba(255, 103, 0, 0.12) 0%, rgba(15, 23, 42, 0.8) 100%);
  border-color: rgba(255, 103, 0, 0.45);
  box-shadow: 0 8px 30px rgba(255, 103, 0, 0.18);
}

.combo-card.featured::before {
  content: 'BÁN CHẠY NHẤT B2B';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #ff6700, #ff8533);
  color: #fff;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.8px;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 10px rgba(255, 103, 0, 0.5);
  white-space: nowrap;
}

.card-tier-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.card-title {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 10px;
  color: #fff;
}

.card-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
  min-height: 40px;
}

.card-pricing {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.card-price-value {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
}

.card-price-unit {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.card-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.card-specs-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: #e2e8f0;
}

.card-specs-item i {
  color: var(--color-primary);
  font-size: 12px;
  margin-top: 3px;
}

.btn-card-cta {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.combo-card.featured .btn-card-cta,
.btn-card-cta.btn-accent {
  background: linear-gradient(135deg, var(--color-primary), #ea580c);
  border: none;
  box-shadow: 0 4px 15px var(--color-primary-glow);
}

.btn-card-cta:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  border-color: var(--color-primary);
}

/* ==========================================================================
   4. INTERACTIVE BUDGET ESTIMATOR (Framer Style Slider)
   ========================================================================== */
.section-calculator {
  padding: 90px 0;
  position: relative;
  background: linear-gradient(180deg, transparent 0%, rgba(12, 18, 32, 0.8) 50%, transparent 100%);
}

.calc-wrapper {
  background: radial-gradient(circle at 50% 0%, rgba(30, 41, 59, 0.6) 0%, rgba(11, 17, 32, 0.95) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-md);
  max-width: 1040px;
  margin: 0 auto;
}

.calc-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.calc-controls {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.calc-slider-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.calc-label {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.calc-count-display {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.calc-count-display span {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* Custom Styled Range Slider */
.custom-range-slider {
  width: 100%;
  height: 10px;
  border-radius: var(--radius-full);
  background: #1e293b;
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
  position: relative;
}

.custom-range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid #fff;
  box-shadow: 0 0 18px var(--color-primary-glow);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.custom-range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.calc-ticks {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 600;
}

.calc-itemized-preview {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.itemized-col {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: #cbd5e1;
}

.itemized-col i {
  color: var(--color-primary);
}

/* Calc Result Card (Right Column) */
.calc-result-card {
  background: linear-gradient(135deg, rgba(255, 103, 0, 0.15) 0%, rgba(15, 23, 42, 0.8) 100%);
  border: 1px solid rgba(255, 103, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.calc-res-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.calc-res-price {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.calc-res-price span {
  font-size: 16px;
  color: var(--color-text-secondary);
}

.calc-res-savings {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.calc-res-features {
  text-align: left;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 13px;
  color: #e2e8f0;
}

.calc-res-features li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.calc-res-features li i {
  color: #34d399;
}

/* ==========================================================================
   5. BENTO GRID (Unboxing The Box & Showroom Reality)
   ========================================================================== */
.section-bento {
  padding: 100px 0;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-auto-rows: 240px;
  gap: 20px;
}

.bento-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  backdrop-filter: blur(12px);
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-glow);
}

.bento-card.col-8 { grid-column: span 8; }
.bento-card.col-4 { grid-column: span 4; }
.bento-card.col-6 { grid-column: span 6; }
.bento-card.row-2 { grid-row: span 2; }

.bento-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
  z-index: 0;
}

.bento-card:hover .bento-bg-img {
  transform: scale(1.05);
}

.bento-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.2) 0%, rgba(7, 11, 20, 0.85) 75%, rgba(7, 11, 20, 0.98) 100%);
  z-index: 1;
}

.bento-content {
  position: relative;
  z-index: 2;
}

.bento-tag {
  font-size: 11px;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.bento-title {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.3;
}

.bento-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   6. B2B COMPARISON MATRIX
   ========================================================================== */
.section-comparison {
  padding: 90px 0;
}

.comparison-table-wrapper {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-md);
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.comp-table th, .comp-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
}

.comp-table th {
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  background: rgba(15, 23, 42, 0.9);
}

.comp-table th.highlight-col {
  background: rgba(255, 103, 0, 0.15);
  color: var(--color-primary);
  border-left: 1px solid rgba(255, 103, 0, 0.3);
  border-right: 1px solid rgba(255, 103, 0, 0.3);
}

.comp-table td.highlight-col {
  background: rgba(255, 103, 0, 0.05);
  border-left: 1px solid rgba(255, 103, 0, 0.2);
  border-right: 1px solid rgba(255, 103, 0, 0.2);
  font-weight: 600;
  color: #fff;
}

.comp-table tr:last-child td {
  border-bottom: none;
}

.badge-bad {
  color: #f87171;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-good {
  color: #34d399;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   7. B2B QUOTE FORM SECTION (15-Minute Guarantee)
   ========================================================================== */
.section-quote {
  padding: 100px 0;
  position: relative;
}

.quote-box {
  background: radial-gradient(circle at 100% 0%, rgba(255, 103, 0, 0.15) 0%, rgba(15, 23, 42, 0.9) 70%);
  border: 1px solid var(--color-border-glow);
  border-radius: var(--radius-lg);
  padding: 50px;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 48px;
  align-items: center;
  box-shadow: var(--shadow-glow-lg);
}

.quote-left h2 {
  font-size: 34px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
}

.quote-left p {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}

.quote-sla-chips {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sla-chip {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: #e2e8f0;
}

.sla-chip i {
  color: var(--color-primary);
  font-size: 16px;
}

/* Form Styles */
.quote-form {
  background: rgba(11, 17, 32, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group-combo {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group-combo label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-secondary);
}

.form-control-combo {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: #fff;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
  font-family: inherit;
}

.form-control-combo:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 12px var(--color-primary-glow);
}

.btn-submit-combo {
  background: linear-gradient(135deg, var(--color-primary) 0%, #ea580c 100%);
  color: #fff;
  border: none;
  padding: 14px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: 0 6px 20px var(--color-primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.btn-submit-combo:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 10px 28px rgba(255, 103, 0, 0.6);
}

/* ==========================================================================
   8. FAQ ACCORDION
   ========================================================================== */
.section-faq {
  padding: 80px 0 120px;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(255, 103, 0, 0.4);
}

.faq-header {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  user-select: none;
}

.faq-header i {
  color: var(--color-primary);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-header i {
  transform: rotate(180deg);
}

.faq-body {
  padding: 0 24px 20px;
  display: none;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.faq-item.active .faq-body {
  display: block;
}

/* ==========================================================================
   9. FOOTER
   ========================================================================== */
.combo-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
  background: #040810;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

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

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

/* Floating Fast Contact Widget */
.floating-contact-pill {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 99;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pill-zalo, .pill-hotline {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-normal);
}

.pill-zalo {
  background: #0068ff;
  color: #fff;
}

.pill-hotline {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 6px 20px var(--color-primary-glow);
}

.pill-zalo:hover, .pill-hotline:hover {
  transform: translateY(-3px) scale(1.05);
}

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (Mobile & Tablet Optimization)
   ========================================================================== */
@media (max-width: 1024px) {
  .stage-inner-flex {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .stage-bullets {
    align-items: center;
  }
  .stage-bullet-item {
    text-align: left;
  }
  .combo-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .quote-box {
    grid-template-columns: 1fr;
  }
  .bento-card.col-8,
  .bento-card.col-4,
  .bento-card.col-6 {
    grid-column: span 12;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-showcase {
    padding: 40px 0 60px;
  }
  .combo-cards-grid {
    grid-template-columns: 1fr;
  }
  .calc-wrapper {
    padding: 24px;
  }
  .quote-box {
    padding: 24px;
  }
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}