/* ============================================================
   S.T.A.R MARKETING AGENCY - MAIN STYLESHEET
   Version: 1.0
   Last Updated: April 2026
   ============================================================ */

/* ============ CSS VARIABLES ============ */
:root {
  /* Brand Colors - Theo Brand Guideline */
  --primary-dark: #042698;
  --primary: #116CF8;
  --primary-light: #21bdef;
  --cyan-glow: rgba(33, 189, 239, 0.4);
  --gradient-1: linear-gradient(135deg, #031288 0%, #2044C4 100%);
  --gradient-2: linear-gradient(135deg, #21bdef 0%, #2044c4 100%);
  
  /* Neutrals */
  --white: #ffffff;
  --gray-100: #f4f7fc;
  --gray-300: #94a3b8;
  --gray-500: #64748b;
  --dark: #0a0f1a;
  --darker: #050810;
  
  /* Typography */
  --font-heading: 'Barlow', sans-serif;
  --font-body: 'Hanken Grotesk', sans-serif;
  
  /* Spacing */
  --section-padding: 120px 5%;
  --container-max: 1200px;
}

/* ============ RESET & BASE ============ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--darker);
  color: var(--white);
  overflow-x: hidden;
  line-height: 1.6;
}

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

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

/* ============ NAVIGATION ============ */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  transition: all 0.4s ease;
}

nav.scrolled {
  background: rgba(5, 8, 16, 0.95);
  backdrop-filter: blur(20px);
  padding: 1rem 5%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* ====== LOGO IMAGE - THAY LOGO Ở ĐÂY ====== */
.logo-img {
  height: 40px;
  width: auto;
}
/* ========================================== */

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--white);
}

.logo-text span {
  color: var(--primary-light);
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
}

.nav-links a {
  font-family: var(--font-heading);
  color: var(--gray-300);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: color 0.3s ease;
}

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

.nav-cta {
  font-family: var(--font-heading);
  padding: 0.75rem 1.75rem;
  background: transparent;
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  color: var(--white);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
}

.nav-cta:hover {
  background: var(--white);
  color: var(--dark);
  border-color: var(--white);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--white);
}

/* ============ HERO SECTION ============ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 150px 5% 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 150%;
  background: radial-gradient(ellipse at center top, rgba(33, 189, 239, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1000px;
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-title .highlight {
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 500;
  color: var(--gray-300);
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.6s forwards;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-heading);
  padding: 1.25rem 3rem;
  background: var(--white);
  border: none;
  border-radius: 4px;
  color: var(--dark);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.8s forwards;
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 50px rgba(255, 255, 255, 0.15);
}

.hero-cta svg {
  transition: transform 0.3s ease;
}

.hero-cta:hover svg {
  transform: translateX(5px);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  animation: fadeIn 1s ease 1.2s forwards;
}

.scroll-text {
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gray-500);
  writing-mode: vertical-rl;
}

.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--primary-light), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* ============ PAGE HEADER (for inner pages) ============ */
.page-header {
  padding: 180px 5% 80px;
  text-align: center;
  position: relative;
  background: var(--darker);
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150%;
  height: 100%;
  background: radial-gradient(ellipse at center top, rgba(33, 189, 239, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

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

.page-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.page-label::before {
  content: '+';
  font-size: 1rem;
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 1rem;
}

.page-desc {
  font-size: 1.1rem;
  color: var(--gray-300);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============ MARQUEE SECTION ============ */
.marquee-section {
  padding: 2rem 0;
  background: var(--dark);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
}

.marquee-track {
  display: flex;
  animation: marquee 30s linear infinite;
}

.marquee-track:nth-child(2) {
  animation-direction: reverse;
  margin-top: 0.5rem;
}

.marquee-content {
  display: flex;
  align-items: center;
  gap: 3rem;
  padding-right: 3rem;
  white-space: nowrap;
}

.marquee-item {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 3rem;
}

.marquee-item::after {
  content: '✦';
  color: var(--primary-light);
  font-size: 0.6rem;
}

.marquee-item.highlight {
  color: var(--primary-light);
}

/* ============ ABOUT SECTION WITH 3D CUBE ============ */
.about-section {
  padding: var(--section-padding);
  background: var(--darker);
  overflow: hidden;
}

.about-wrapper {
  max-width: 1300px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-content {
  max-width: 550px;
}

.about-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 1.5rem;
}

.about-label::before {
  content: '+';
  font-size: 1rem;
}

.about-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 2rem;
}

.about-text {
  font-size: 1rem;
  color: var(--gray-300);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.about-text strong {
  color: var(--white);
  font-weight: 600;
}

.about-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--primary-light);
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.about-link:hover {
  gap: 1.25rem;
}

/* ============ 3D CUBE ============ */
.cube-container {
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
  min-height: 400px;
}

.cube-wrapper {
  width: 280px;
  height: 280px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.1s ease-out;
}

.cube {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  animation: cubeFloat 6s ease-in-out infinite;
}

.cube-face {
  position: absolute;
  width: 280px;
  height: 280px;
  border: 1px solid rgba(33, 189, 239, 0.3);
  background: rgba(33, 189, 239, 0.03);
  backdrop-filter: blur(5px);
}

.cube-face.front { transform: translateZ(140px); }
.cube-face.back { transform: rotateY(180deg) translateZ(140px); }
.cube-face.right { transform: rotateY(90deg) translateZ(140px); }
.cube-face.left { transform: rotateY(-90deg) translateZ(140px); }
.cube-face.top { transform: rotateX(90deg) translateZ(140px); }
.cube-face.bottom { transform: rotateX(-90deg) translateZ(140px); }

.cube-face::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(33, 189, 239, 0.2);
  box-shadow: 
    inset 0 0 30px rgba(33, 189, 239, 0.05),
    0 0 20px rgba(33, 189, 239, 0.1);
}

.cube-inner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) translateZ(0);
  width: 200px;
  height: 200px;
  border-radius: 20px;
  overflow: hidden;
}

.aurora {
  position: absolute;
  width: 300%;
  height: 300%;
  top: -100%;
  left: -100%;
  background: 
    radial-gradient(ellipse at 30% 20%, rgba(33, 189, 239, 0.8) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 60%, rgba(107, 0, 255, 0.6) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(17, 108, 248, 0.7) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 70%, rgba(0, 255, 200, 0.4) 0%, transparent 40%);
  animation: auroraMove 8s ease-in-out infinite;
  filter: blur(30px);
}

.cube-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
}

.cube-logo svg {
  width: 80px;
  height: 80px;
  fill: rgba(255, 255, 255, 0.9);
  filter: drop-shadow(0 0 20px rgba(33, 189, 239, 0.5));
}

/* ============ S.T.A.R MEANING SECTION ============ */
.meaning-section {
  padding: var(--section-padding);
  background: var(--dark);
}

.meaning-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.meaning-header {
  text-align: center;
  margin-bottom: 5rem;
}

.meaning-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 1.5rem;
}

.meaning-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--white);
}

.star-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  overflow: hidden;
}

.star-item {
  background: var(--darker);
  padding: 3rem 2rem;
  text-align: center;
  transition: all 0.4s ease;
  position: relative;
}

.star-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-2);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.star-item:hover {
  background: rgba(33, 189, 239, 0.05);
}

.star-item:hover::before {
  transform: scaleX(1);
}

.star-letter {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 1rem;
}

.star-word {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1rem;
  letter-spacing: 1px;
}

.star-desc {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ============ SERVICES SECTION ============ */
.services-section {
  padding: var(--section-padding);
  background: var(--darker);
}

.services-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-light);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--white);
}

.section-desc {
  font-size: 1.1rem;
  color: var(--gray-500);
  max-width: 600px;
  margin: 1rem auto 0;
  line-height: 1.7;
}

/* Service Phase Cards */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.phase-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2.5rem;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.phase-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.phase-card:hover {
  background: rgba(33, 189, 239, 0.03);
  border-color: rgba(33, 189, 239, 0.2);
  transform: translateY(-5px);
}

.phase-card:hover::before {
  transform: scaleX(1);
}

.phase-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--gradient-2);
  border-radius: 12px;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.phase-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.phase-title-vi {
  font-size: 1rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-bottom: 1rem;
}

.phase-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.phase-meta span {
  font-size: 0.85rem;
  color: var(--primary-light);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.phase-desc {
  font-size: 0.95rem;
  color: var(--gray-300);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.phase-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.phase-list li {
  font-size: 0.9rem;
  color: var(--gray-300);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.phase-list li::before {
  content: '✓';
  color: var(--primary-light);
  font-weight: bold;
}

/* ============ CASE STUDY SECTION ============ */
.case-section {
  padding: var(--section-padding);
  background: var(--dark);
}

.case-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.case-card {
  background: linear-gradient(135deg, rgba(33, 189, 239, 0.05) 0%, rgba(107, 0, 255, 0.05) 100%);
  border: 1px solid rgba(33, 189, 239, 0.15);
  border-radius: 24px;
  padding: 3rem;
  margin-bottom: 2rem;
  transition: all 0.4s ease;
}

.case-card:hover {
  border-color: rgba(33, 189, 239, 0.3);
  transform: translateY(-5px);
}

.case-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.case-logo {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.case-tags {
  display: flex;
  gap: 0.75rem;
}

.case-tag {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--gray-300);
}

.case-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.case-block h4 {
  color: var(--primary-light);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
}

.case-block p {
  color: var(--gray-300);
  line-height: 1.7;
}

.case-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.case-result {
  text-align: center;
  padding: 1.5rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 12px;
}

.case-result-value {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary-light);
  line-height: 1;
}

.case-result-label {
  font-size: 0.9rem;
  color: var(--gray-500);
  margin-top: 0.5rem;
}

/* ============ TEAM SECTION ============ */
.team-section {
  padding: var(--section-padding);
  background: var(--darker);
}

.team-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.team-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  transition: all 0.4s ease;
}

.team-card:hover {
  background: rgba(33, 189, 239, 0.03);
  border-color: rgba(33, 189, 239, 0.2);
  transform: translateY(-5px);
}

.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-2);
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--white);
}

.team-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.team-role {
  font-size: 0.9rem;
  color: var(--primary-light);
  margin-bottom: 1rem;
}

.team-bio {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ============ VALUES SECTION ============ */
.values-section {
  padding: var(--section-padding);
  background: var(--dark);
}

.values-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.value-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2.5rem;
  transition: all 0.4s ease;
}

.value-card:hover {
  background: rgba(33, 189, 239, 0.03);
  border-color: rgba(33, 189, 239, 0.2);
}

.value-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-2);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.value-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.75rem;
}

.value-desc {
  font-size: 0.95rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ============ CTA SECTION ============ */
.cta-section {
  padding: 100px 5%;
  background: var(--gradient-1);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(33, 189, 239, 0.2) 0%, transparent 40%),
    radial-gradient(circle at 80% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
}

.cta-container {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 2;
}

.cta-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.cta-desc {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 2.5rem;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-heading);
  padding: 1.25rem 3rem;
  background: var(--white);
  border: none;
  border-radius: 4px;
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

/* ============ FOOTER ============ */
footer {
  padding: 60px 5% 40px;
  background: var(--darker);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
  max-width: 300px;
}

/* ====== FOOTER LOGO - THAY LOGO Ở ĐÂY ====== */
.footer-logo-img {
  height: 36px;
  width: auto;
  margin-bottom: 1rem;
}
/* ============================================ */

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--white);
  margin-bottom: 1rem;
}

.footer-logo span {
  color: var(--primary-light);
}

.footer-tagline {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 4rem;
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 1.25rem;
  color: var(--white);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.75rem;
}

.footer-col a {
  color: var(--gray-500);
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--gray-500);
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.footer-social a:hover {
  border-color: var(--primary-light);
  color: var(--primary-light);
}

/* ============ ANIMATIONS ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.5); opacity: 0.5; }
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes cubeFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

@keyframes auroraMove {
  0%, 100% { transform: rotate(0deg) scale(1); }
  25% { transform: rotate(90deg) scale(1.1); }
  50% { transform: rotate(180deg) scale(1); }
  75% { transform: rotate(270deg) scale(1.1); }
}

/* Animation classes for scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .about-wrapper {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .about-content {
    max-width: 100%;
  }
  
  .cube-container {
    min-height: 350px;
  }
  
  .cube-wrapper {
    width: 220px;
    height: 220px;
  }
  
  .cube-face {
    width: 220px;
    height: 220px;
  }
  
  .cube-face.front { transform: translateZ(110px); }
  .cube-face.back { transform: rotateY(180deg) translateZ(110px); }
  .cube-face.right { transform: rotateY(90deg) translateZ(110px); }
  .cube-face.left { transform: rotateY(-90deg) translateZ(110px); }
  .cube-face.top { transform: rotateX(90deg) translateZ(110px); }
  .cube-face.bottom { transform: rotateX(-90deg) translateZ(110px); }
  
  .star-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .phase-grid {
    grid-template-columns: 1fr;
  }
  
  .case-body {
    grid-template-columns: 1fr;
  }
  
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px 5%;
  }
  
  .nav-links, .nav-cta {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .star-grid {
    grid-template-columns: 1fr;
  }
  
  .case-results {
    grid-template-columns: 1fr;
  }
  
  .values-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    gap: 2rem;
  }
  
  .phase-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .cube-wrapper {
    width: 180px;
    height: 180px;
  }
  
  .cube-face {
    width: 180px;
    height: 180px;
  }
  
  .cube-face.front { transform: translateZ(90px); }
  .cube-face.back { transform: rotateY(180deg) translateZ(90px); }
  .cube-face.right { transform: rotateY(90deg) translateZ(90px); }
  .cube-face.left { transform: rotateY(-90deg) translateZ(90px); }
  .cube-face.top { transform: rotateX(90deg) translateZ(90px); }
  .cube-face.bottom { transform: rotateX(-90deg) translateZ(90px); }
  
  .footer-top {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    align-items: center;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}