/* ============================================
   Phế Liệu Văn Cường — Mintlify-Inspired Design
   ============================================ */

/* ---- Custom Properties ---- */
:root {
  /* Colors */
  --color-canvas: #ffffff;
  --color-canvas-dark: #0a0a0b;
  --color-surface: #f7f7f8;
  --color-surface-soft: #fafafa;
  --color-hairline: #e4e4e7;
  --color-hairline-soft: #f0f0f1;
  
  --color-ink: #0a0a0b;
  --color-charcoal: #3a3a3e;
  --color-slate: #6b6b72;
  --color-steel: #8e8e96;
  --color-muted: #a1a1aa;
  --color-on-dark: #ffffff;
  --color-on-dark-muted: rgba(255,255,255,0.7);
  
  --color-primary: #0a0a0b;
  --color-on-primary: #ffffff;
  --color-brand-green: #00d4a4;
  --color-brand-green-deep: #00b88e;
  --color-brand-green-soft: rgba(0,212,164,0.1);
  --color-testimonial-orange: #f97316;
  --color-brand-error: #ef4444;
  
  --color-hero-sky-from: #dbeafe;
  --color-hero-sky-to: #fef3c7;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-subtle: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-mockup: 0 24px 48px -8px rgba(0,0,0,0.12);
  --shadow-brand: rgba(0,212,164,0.08) 0px 8px 24px;
  
  /* Spacing */
  --sp-xs: 8px;
  --sp-sm: 12px;
  --sp-md: 16px;
  --sp-lg: 20px;
  --sp-xl: 24px;
  --sp-2xl: 32px;
  --sp-3xl: 40px;
  --sp-section-sm: 48px;
  --sp-section: 64px;
  --sp-section-lg: 96px;
  --sp-hero: 120px;
  
  /* Container */
  --container-max: 1280px;
  --container-gutter: 32px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-charcoal);
  background: var(--color-canvas);
  line-height: 1.5;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ---- Cinematic Image Filter ---- */
.cinematic-wrap {
  position: relative;
  overflow: hidden;
  border-radius: inherit;
}

.cinematic-wrap img {
  filter: brightness(1.02) contrast(1.06) saturate(0.88);
  transition: filter 0.4s ease;
}

.cinematic-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(0, 40, 80, 0.07) 0%,
    rgba(140, 70, 15, 0.04) 50%,
    transparent 100%
  );
  mix-blend-mode: overlay;
  pointer-events: none;
}

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-gutter);
}

/* ---- Typography ---- */
.h-display {
  font-size: 72px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -2px;
  color: var(--color-ink);
}

.h-display-lg {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -1.5px;
  color: var(--color-ink);
}

.h1 {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--color-ink);
}

.h2 {
  font-size: 36px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--color-ink);
}

.h3 {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.25;
}

.h4 {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
}

.h5 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

.subtitle {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-slate);
}

.body-md {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
}

.body-sm {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-slate);
}

.caption {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.4;
}

.micro {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  line-height: 1;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all 150ms ease;
  white-space: nowrap;
}

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

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

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

.btn-accent:hover {
  background: var(--color-brand-green-deep);
}

.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}

.btn-secondary:hover {
  border-color: var(--color-steel);
}

.btn-phone {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  color: #fff;
  border: none;
  position: relative;
  box-shadow: 0 4px 15px rgba(249, 115, 22, 0.35);
}

.btn-phone:hover {
  background: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
  box-shadow: 0 6px 20px rgba(249, 115, 22, 0.45);
  transform: translateY(-1px);
}

.btn-phone i.ti {
  animation: phone-ring 2s ease-in-out infinite;
}

@keyframes phone-ring {
  0%, 100% { transform: rotate(0); }
  20% { transform: rotate(-15deg); }
  40% { transform: rotate(10deg); }
  60% { transform: rotate(-10deg); }
  80% { transform: rotate(5deg); }
}

.btn-phone-sm {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  color: #fff;
  border: none;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
}

.btn-phone-sm:hover {
  background: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.4);
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  padding: 8px 12px;
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ---- Section ---- */
.section {
  padding: var(--sp-section) 0;
}

.section-lg {
  padding: var(--sp-section-lg) 0;
}

.section-sm {
  padding: var(--sp-section-sm) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--sp-2xl);
}

.section-title .subtitle {
  margin-top: var(--sp-sm);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- Grid ---- */
.grid {
  display: grid;
  gap: var(--sp-xl);
}

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

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

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

.grid-6 {
  grid-template-columns: repeat(6, 1fr);
}

/* ---- Card ---- */
.card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  padding: var(--sp-xl);
  transition: box-shadow 150ms ease;
}

.card:hover {
  box-shadow: var(--shadow-card);
}

.card-featured {
  border: 2px solid var(--color-brand-green);
  box-shadow: var(--shadow-brand);
}

.card-surface {
  background: var(--color-surface);
  border: none;
}

.card-sm {
  padding: var(--sp-lg);
}

.card-lg {
  padding: var(--sp-2xl);
}

/* ---- Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-hairline-soft);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 64px;
  gap: var(--sp-2xl);
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo img {
  height: 48px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
  flex: 1;
}

.nav-links > li {
  position: relative;
}

.nav-links > li > a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-slate);
  padding: 8px 4px;
  transition: color 150ms ease;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links > li > a:hover,
.nav-links > li > a.active {
  color: var(--color-ink);
}

.nav-ctas {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  flex-shrink: 0;
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--sp-xs) 0;
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all 150ms ease;
  box-shadow: var(--shadow-card);
  z-index: 10;
}

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

.nav-dropdown a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-slate);
  transition: background 150ms ease;
}

.nav-dropdown a:hover {
  background: var(--color-surface);
  color: var(--color-ink);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-ink);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-canvas);
  z-index: 200;
  padding: var(--sp-xl);
  overflow-y: auto;
}

.mobile-menu.open {
  display: block;
}

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-2xl);
}

.mobile-menu-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  color: var(--color-ink);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.mobile-nav-links > li > a {
  display: block;
  padding: 12px 0;
  font-size: 18px;
  font-weight: 500;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-hairline-soft);
}

.mobile-nav-links .sub-menu {
  padding-left: var(--sp-lg);
  margin-top: var(--sp-xs);
}

.mobile-nav-links .sub-menu a {
  font-size: 15px;
  color: var(--color-slate);
  padding: 8px 0;
  display: block;
}

/* ---- Hero Band (Sky) ---- */
.hero-band {
  background: linear-gradient(180deg, var(--color-hero-sky-from) 0%, var(--color-hero-sky-to) 100%);
  padding: var(--sp-hero) 0 var(--sp-section);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-band::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
  pointer-events: none;
}

.hero-band::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content .h-display {
  margin-bottom: var(--sp-xl);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.hero-content .subtitle {
  margin-bottom: var(--sp-2xl);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  font-size: 20px;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: var(--sp-md);
  margin-bottom: var(--sp-section);
  flex-wrap: wrap;
}

.hero-mockup {
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline-soft);
  box-shadow: var(--shadow-mockup);
  overflow: hidden;
  background: var(--color-canvas);
}

.hero-mockup img {
  width: 100%;
  height: auto;
}

/* ---- About Section ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-section);
  align-items: center;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-image img {
  width: 100%;
  height: auto;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-md);
  margin-top: var(--sp-2xl);
}

.about-feature {
  text-align: center;
  padding: var(--sp-lg);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.about-feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--sp-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-feature-icon i.ti {
  font-size: 32px;
  color: var(--color-brand-green);
}

.about-feature p {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-charcoal);
  line-height: 1.3;
}

/* ---- Service Cards ---- */
.service-card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  overflow: hidden;
  transition: box-shadow 150ms ease;
}

.service-card:hover {
  box-shadow: var(--shadow-card);
}

.service-card-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.service-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 300ms ease;
}

.service-card:hover .service-card-image img {
  transform: scale(1.05);
}

.service-card-body {
  padding: var(--sp-lg);
}

.service-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--sp-xs);
  color: var(--color-ink);
}

.service-card-body p {
  font-size: 14px;
  color: var(--color-slate);
  line-height: 1.5;
  margin-bottom: var(--sp-md);
}

.service-card-body .btn {
  font-size: 13px;
}

/* ---- Pricing Cards ---- */
.pricing-grid {
  display: grid;
  gap: var(--sp-lg);
}

.pricing-card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  overflow: hidden;
}

.pricing-card-header {
  padding: var(--sp-md) var(--sp-xl);
  background: var(--color-primary);
  color: var(--color-on-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.pricing-card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.pricing-card-body {
  padding: var(--sp-md) var(--sp-xl);
}

.pricing-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-hairline-soft);
  font-size: 14px;
}

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

.pricing-row .name {
  color: var(--color-charcoal);
}

.pricing-row .price {
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
}

.pricing-card-footer {
  padding: var(--sp-md) var(--sp-xl);
  border-top: 1px solid var(--color-hairline-soft);
}

/* ---- Process Steps ---- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-xl);
  position: relative;
}

.process-step {
  text-align: center;
  position: relative;
}

.process-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 32px;
  left: calc(50% + 40px);
  right: calc(-50% + 40px);
  height: 2px;
  background: var(--color-hairline);
}

.process-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--sp-md);
  background: var(--color-brand-green-soft);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.process-icon img, .process-icon i.ti {
  width: 36px;
  height: 36px;
  object-fit: contain;
  font-size: 36px;
  color: var(--color-brand-green);
}

.process-step h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--sp-xs);
  color: var(--color-ink);
}

.process-step p {
  font-size: 14px;
  color: var(--color-slate);
  line-height: 1.5;
  max-width: 220px;
  margin: 0 auto;
}

/* ---- Stats ---- */
.stats-bg {
  position: relative;
  background-size: cover;
  background-position: center;
  background-image: url(../../wp-content/uploads/2021/08/about-bg-handshake.jpg);
}

.stats-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 11, 0.7);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-xl);
  position: relative;
  z-index: 1;
}

.stat-item {
  text-align: center;
  padding: var(--sp-xl);
}

.stat-item .stat-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--sp-md);
}

.stat-item .stat-icon img,
.stat-item .stat-icon i.ti {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  font-size: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-number {
  font-size: 48px;
  font-weight: 600;
  color: var(--color-on-dark);
  line-height: 1.1;
}

.stat-label {
  font-size: 15px;
  color: var(--color-on-dark-muted);
  margin-top: var(--sp-xs);
}

/* ---- Logo Wall ---- */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--sp-xl);
  align-items: center;
}

.logo-item {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-lg);
  opacity: 0.6;
  transition: opacity 150ms ease;
}

.logo-item:hover {
  opacity: 1;
}

.logo-item img {
  max-height: 50px;
  width: auto;
  object-fit: contain;
}

/* ---- Location Cards ---- */
.location-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-hairline);
  transition: box-shadow 150ms ease;
}

.location-card:hover {
  box-shadow: var(--shadow-card);
}

.location-card img {
  width: 100%;
  aspect-ratio: 16/12;
  object-fit: cover;
}

.location-card-body {
  padding: var(--sp-md) var(--sp-lg);
}

.location-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--sp-xs);
}

.location-card-body p {
  font-size: 14px;
  color: var(--color-slate);
  line-height: 1.5;
}

/* ---- Testimonials ---- */
.testimonial-card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  padding: var(--sp-2xl);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card.featured {
  background: var(--color-testimonial-orange);
  border-color: transparent;
  color: var(--color-on-dark);
}

.testimonial-card.featured .testimonial-text {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
}

.testimonial-card.featured .testimonial-author-name {
  color: var(--color-on-dark);
}

.testimonial-card.featured .testimonial-author-title {
  color: var(--color-on-dark-muted);
}

.testimonial-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-charcoal);
  margin-bottom: var(--sp-xl);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.testimonial-author img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-author-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.testimonial-author-title {
  font-size: 13px;
  color: var(--color-steel);
}

/* ---- Blog Cards ---- */
.blog-card {
  background: var(--color-canvas);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
  overflow: hidden;
  transition: box-shadow 150ms ease;
}

.blog-card:hover {
  box-shadow: var(--shadow-card);
}

.blog-card-image {
  aspect-ratio: 16/10;
  overflow: hidden;
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 300ms ease;
}

.blog-card:hover .blog-card-image img {
  transform: scale(1.05);
}

.blog-card-body {
  padding: var(--sp-lg);
}

.blog-card-body .blog-date {
  font-size: 12px;
  color: var(--color-steel);
  font-weight: 500;
  margin-bottom: var(--sp-xs);
}

.blog-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--sp-xs);
  line-height: 1.4;
}

.blog-card-body p {
  font-size: 14px;
  color: var(--color-slate);
  line-height: 1.5;
  margin-bottom: var(--sp-md);
}

/* ---- CTA Band ---- */
.cta-band {
  background: var(--color-canvas-dark);
  padding: var(--sp-section-lg) 0;
  text-align: center;
}

.cta-band h2 {
  color: var(--color-on-dark);
  margin-bottom: var(--sp-sm);
}

.cta-band .subtitle {
  color: var(--color-on-dark-muted);
  margin-bottom: var(--sp-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-form {
  display: flex;
  gap: var(--sp-sm);
  max-width: 480px;
  margin: 0 auto;
  justify-content: center;
}

.cta-form input {
  flex: 1;
  height: 48px;
  padding: 0 var(--sp-md);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.1);
  color: var(--color-on-dark);
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  transition: border-color 150ms ease;
}

.cta-form input::placeholder {
  color: var(--color-on-dark-muted);
}

.cta-form input:focus {
  border-color: var(--color-brand-green);
}

/* ---- Footer ---- */
.footer {
  background: var(--color-canvas);
  border-top: 1px solid var(--color-hairline);
  padding: var(--sp-section) 0 var(--sp-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 2fr 2fr 2fr;
  gap: var(--sp-2xl);
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--sp-lg);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-col p {
  font-size: 14px;
  color: var(--color-steel);
  line-height: 1.6;
  margin-bottom: var(--sp-sm);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--color-steel);
  padding: 4px 0;
  transition: color 150ms ease;
}

.footer-col a:hover {
  color: var(--color-ink);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-sm);
  font-size: 14px;
  color: var(--color-steel);
}

.footer-contact li strong {
  color: var(--color-charcoal);
  font-weight: 600;
}

.footer-subscribe {
  display: flex;
  gap: var(--sp-xs);
  margin-top: var(--sp-md);
}

.footer-subscribe input {
  flex: 1;
  height: 40px;
  padding: 0 var(--sp-sm);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
}

.footer-subscribe input:focus {
  border-color: var(--color-brand-green);
}

.footer-bottom {
  margin-top: var(--sp-2xl);
  padding-top: var(--sp-lg);
  border-top: 1px solid var(--color-hairline-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-steel);
}

/* ---- Floating Buttons ---- */
.floating-buttons {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.floating-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-card);
  transition: transform 150ms ease;
  border: none;
  cursor: pointer;
}

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

.floating-btn img {
  width: 28px;
  height: 28px;
}

.floating-btn.zalo {
  background: #0068ff;
}

.floating-btn.phone {
  background: var(--color-brand-green);
}

/* ---- Section Backgrounds ---- */
.section-surface {
  background: var(--color-surface);
}

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

/* ---- Top Bar ---- */
.top-bar {
  background: var(--color-primary);
  color: var(--color-on-dark);
  font-size: 13px;
  padding: 8px 0;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.top-bar a {
  color: var(--color-on-dark-muted);
  transition: color 150ms ease;
}

.top-bar a:hover {
  color: var(--color-on-dark);
}

.top-bar-phone {
  font-weight: 600;
  color: var(--color-on-dark) !important;
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 50;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
  box-shadow: var(--shadow-subtle);
  cursor: pointer;
  transition: box-shadow 150ms ease;
}

.back-to-top:hover {
  box-shadow: var(--shadow-card);
}

/* ---- Badge ---- */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.badge-green {
  background: var(--color-brand-green);
  color: var(--color-primary);
}

.badge-red {
  background: var(--color-brand-error);
  color: var(--color-on-dark);
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-in-delay-1 {
  animation-delay: 0.1s;
}

.animate-in-delay-2 {
  animation-delay: 0.2s;
}

.animate-in-delay-3 {
  animation-delay: 0.3s;
}

/* ---- Responsive: Tablet (768-1023px) ---- */
@media (max-width: 1023px) {
  .h-display {
    font-size: 56px;
    letter-spacing: -1.5px;
  }
  
  .h1 {
    font-size: 36px;
  }
  
  .h2 {
    font-size: 28px;
  }
  
  .nav-links {
    display: none;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-2xl);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-2xl);
  }
  
  .process-step:not(:last-child)::after {
    display: none;
  }
  
  .logo-wall {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-band {
    padding: var(--sp-section) 0 var(--sp-2xl);
  }
}

/* ---- Responsive: Mobile (<768px) ---- */
@media (max-width: 767px) {
  .h-display {
    font-size: 36px;
    letter-spacing: -1px;
  }
  
  .h-display-lg {
    font-size: 32px;
  }
  
  .h1 {
    font-size: 28px;
  }
  
  .h2 {
    font-size: 24px;
  }
  
  .subtitle {
    font-size: 16px;
  }
  
  .hero-content .subtitle {
    font-size: 16px;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .process-grid {
    grid-template-columns: 1fr;
  }
  
  .logo-wall {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-features {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-number {
    font-size: 36px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-ctas .btn {
    width: 100%;
  }
  
  .cta-form {
    flex-direction: column;
    align-items: stretch;
  }
  
  .nav-ctas .btn {
    padding: 8px 14px;
    font-size: 13px;
  }
  
  .top-bar-inner {
    flex-direction: column;
    gap: 4px;
  }
  
  .hero-band {
    padding: var(--sp-2xl) 0 var(--sp-xl);
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--sp-sm);
    text-align: center;
  }
  
  .floating-btn {
    width: 48px;
    height: 48px;
  }
  
  .floating-btn img {
    width: 24px;
    height: 24px;
  }
  
  .section {
    padding: var(--sp-2xl) 0;
  }
  
  .section-lg {
    padding: var(--sp-section-sm) 0;
  }
}

/* ---- Responsive: Mobile small (<480px) ---- */
@media (max-width: 479px) {
  .h-display {
    font-size: 28px;
  }
  
  .logo-wall {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .about-features {
    grid-template-columns: 1fr;
  }
}