:root {
    --primary-color: #22c55e;
    --primary-dark: #15803d;
    --primary-light: #dcfce7;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-green-light: #f0fdf4;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Responsive variables */
    --container-padding: clamp(20px, 5vw, 180px);
    --section-padding: clamp(26px, 4vw, 58px);
    --grid-gap: clamp(20px, 10vw, 200px);
    --small-gap: clamp(10px, 3vw, 40px);
}

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

body {
    font-family: "Sora", Arial, Helvetica, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* KEYFRAMES FOR ANIMATIONS */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(60px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-60px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes rotateIn {
    from {
        opacity: 0;
        transform: rotate(-10deg) scale(0.9);
    }
    to {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

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

/* Container utility */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Header */
.header {
    background: #000;
    color: white;
    padding: clamp(10px, 2vw, 15px) 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(15px, 3vw, 20px);
}

.logo img {
    height: clamp(60px, 8vw, 100px);
    width: auto;
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.05);
}

.nav {
    display: flex;
    align-items: center;
    gap: clamp(15px, 3vw, 30px);
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: clamp(16px, 2.5vw, 28px);
    font-weight: 400;
    transition: all 0.3s ease;
    text-transform: capitalize;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.signup-btn {
    background: #49f63e;
    color: rgb(0, 0, 0);
    border: none;
    padding: clamp(8px, 1.5vw, 10px) clamp(15px, 3vw, 20px);
    border-radius: 25px;
    font-weight: bold;
    font-size: clamp(14px, 2.5vw, 28px);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.signup-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 20px rgba(73, 246, 62, 0.3);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Hero Section */
.hero {
    background: #000;
    color: white;
    text-align: center;
    padding: clamp(40px, 10vw, 80px) 0 var(--section-padding);
    margin-top: clamp(60px, 10vw, 70px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
    padding-bottom: clamp(40px, 10vw, 100px);
}

.hero-subtitle {
    font-size: clamp(32px, 8vw, 60px);
    color: #49f63e;
    margin-bottom: clamp(20px, 3vw, 40px);
    font-weight: 500;
    animation: fadeInDown 1s ease-out;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.hero-title {
    font-size: clamp(20px, 8vw, 32px);
    font-weight: 500;
    margin-bottom: clamp(10px, 2vw, 16px);
    line-height: 1.2;
    animation: fadeInUp 1s ease-out 0.3s both;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.hero-main {
    font-size: clamp(20px, 8vw, 32px);
    font-weight: 500;
    line-height: 1.2;
    animation: fadeInUp 1s ease-out 0.6s both;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

/* Section base styles */
.section {
    padding: var(--section-padding) 0;
    background: var(--bg-white);
}
.section2 {
    padding: var(--section-padding) 0;
    background: #ebfaea;
}
.section .container {
    padding: 0 var(--container-padding);
}

/* ANIMATED IMAGE CLASSES */
.animate-on-scroll {
    opacity: 0;
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.animate-on-scroll.animate {
    opacity: 1;
}

.animate-fade-up {
    transform: translateY(60px);
}

.animate-fade-up.animate {
    transform: translateY(0);
}

.animate-fade-down {
    transform: translateY(-60px);
}

.animate-fade-down.animate {
    transform: translateY(0);
}

.animate-fade-left {
    transform: translateX(-60px);
}

.animate-fade-left.animate {
    transform: translateX(0);
}

.animate-fade-right {
    transform: translateX(60px);
}

.animate-fade-right.animate {
    transform: translateX(0);
}

.animate-scale {
    transform: scale(0.8);
}

.animate-scale.animate {
    transform: scale(1);
}

.animate-rotate {
    transform: rotate(-10deg) scale(0.9);
}

.animate-rotate.animate {
    transform: rotate(0deg) scale(1);
}

/* Process Section */
.process-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--grid-gap);
    align-items: center;
}

.grid-title {
    font-size: clamp(20px, 4.5vw, 32px);
    font-weight: 500;
    color: #013927;
    letter-spacing: 1px;
}

.grid-text p {
    font-size: clamp(14px, 3.5vw, 20px);
    line-height: 1.2;
    font-weight: 400;
    color: var(--text-dark);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.grid-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.grid-image img {
    width: 100%;
    max-width: clamp(300px, 80vw, 700px);
    height: auto;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.grid-image img:hover {
    transform: scale(1.05) rotate(1deg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

/* Challenge Section */
.challenge-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--grid-gap);
    align-items: center;
}

/* Environment Section */
.environment-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--grid-gap);
    align-items: center;
}

/* Vision Mission Section */
.vision-mission {
    margin-top: var(--section-padding);
    padding-top: clamp(20px, 4vw, 120px);
    padding-bottom: clamp(20px, 4vw, 120px);
    background-color: #ebfaea;
}

.vm-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(40px, 10vw, 120px);
}

.vision, .mission {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.vm-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(10px, 2vw, 15px);
    margin-bottom: clamp(10px, 2vw, 15px);
    flex-wrap: wrap;
}

.vm-icon img {
    width: clamp(50px, 8vw, 80px);
    height: clamp(50px, 8vw, 80px);
    border-radius: 50%;
    transition: all 0.4s ease;
    animation: float 3s ease-in-out infinite;
}

.vm-icon img:hover {
    transform: scale(1.1) rotate(10deg);
    box-shadow: 0 10px 30px rgba(34, 197, 94, 0.3);
}

.vision h2, .mission h2 {
    font-size: clamp(20px, 5vw, 32px);
    font-weight: 700;
    color: #013927;
    margin: 0;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.vision p, .mission p {
    font-size: clamp(14px, 3.5vw, 20px);
    color: #013927;
    line-height: 1.4;
    font-weight: 400;
    font-family: "Sora", Arial, Helvetica, sans-serif;
    max-width: 500px;
}

/* Values Section */
.values-section {
    padding: var(--section-padding) var(--container-padding);
    background: #ffffff;
    text-align: center;
}

.section-title {
    font-size: clamp(20px, 4.5vw, 32px);
    font-weight: 500;
    color: #013927;
    letter-spacing: 1px;
    padding-bottom: clamp(40px, 3vw, 120px);
    margin-top: clamp(40px, 3vw, 100px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0;
    justify-items: center;
    margin-bottom: var(--small-gap);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.value-card {
    max-width: 520px;
    padding-bottom: clamp(20px, 4vw, 50px);
    transition: all 0.4s ease;
}

.value-card:hover {
    transform: translateY(-10px);
}

.value-icon {
    margin-bottom: clamp(8px, 2vw, 12px);
}

.value-icon img {
    width: clamp(60px, 15vw, 110px);
    height: clamp(60px, 15vw, 110px);
    object-fit: contain;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.1));
}

.value-icon img:hover {
    transform: scale(1.1) rotate(-5deg);
    filter: drop-shadow(0 15px 35px rgba(34, 197, 94, 0.2));
}

.value-card h3 {
    font-size: clamp(20px, 4.5vw, 32px);
    font-weight: 600;
    color: #013927;
    margin-bottom: clamp(4px, 1vw, 6px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.value-card p {
    font-size: clamp(14px, 2.5vw, 20px);
    color: #013927;
    line-height: 1.2;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.values-description {
    max-width: 1000px;
    margin: 0 auto;
    font-size: clamp(14px, 3.5vw, 20px);
    color: #013927;
    line-height: 1.3;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.cta-button {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: clamp(40px, 8vw, 60px) auto 0;
    background-color: #009800;
    border-radius: 12px;
    width: clamp(120px, 50vw, 200px);
    height: clamp(40px, 12vw, 50px);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button2 {
    font-size: clamp(14px, 4vw, 20px);
    font-weight: 700;
    color: white;
    text-decoration: none;
    font-family: "Sora", Arial, Helvetica, sans-serif;
    letter-spacing: 1px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-button:hover {
    background-color: #16a34a;
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 152, 0, 0.3);
}

/* Different Section - ĐÃ ĐƯỢC TỐI ƯU CHO MOBILE */
.different-section {
    padding: var(--section-padding) var(--container-padding);
    background: var(--bg-light);
}

.different-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(40px, 12vw, 160px);
    align-items: center;
    margin-top: clamp(40px, 3vw, 100px);
    margin-bottom: clamp(40px, 3vw, 100px);
}

.different-item {
    display: flex;
    background-color: #ebfaea;
    padding: clamp(2px, 2vw, 10px);
    border: 2px solid #22c55e;
    border-radius: 16px;
    gap: clamp(5px, 3vw, 20px);
    min-height: fit-content;
    margin-bottom: clamp(14px, 3vw, 24px);
    align-items: center;
    transition: all 0.3s ease;
}

.different-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(34, 197, 94, 0.2);
    border-color: var(--primary-dark);
}

.different-icon {
    color: rgb(22, 168, 54);
    font-size: clamp(20px, 4vw, 32px);
    cursor: pointer;
    flex-shrink: 0;
    user-select: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.different-icon:hover {
    transform: rotate(90deg) scale(1.1);
    color: var(--primary-dark);
}

.different-text {
    flex: 1;
}

.different-text h3 {
    font-size: clamp(14px, 3vw, 20px);
    font-weight: 600;
    color: #013927;
    line-height: 1.2;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.different-detail p {
    font-size: clamp(14px, 2.2vw, 16px);
    color: #013927;
    line-height: 1.4;
    margin-top: clamp(6px, 1vw, 10px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.different-image img {
    width: 100%;
    max-width: clamp(250px, 70vw, 700px);
    height: auto;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.different-image img:hover {
    transform: scale(1.03) rotate(-1deg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.hidden {
    display: none;
}

/* Impact Section */
.impact-section {
    padding: var(--small-gap) var(--container-padding) var(--section-padding);
    background-color: #ebfaea;
    text-align: center;
}

.impact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: clamp(10px, 4vw, 20px);
}

.impact-item {
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

.impact-item:hover {
    transform: translateY(-5px);
}

.impact-item h3 {
    font-size: clamp(16px, 3.5vw, 24px);
    font-weight: 600;
    font-family: "Sora", Arial, Helvetica, sans-serif;
    color: #013927;
    margin-bottom: clamp(10px, 2vw, 15px);
}

.impact-item p {
    font-size: clamp(14px, 2.5vw, 18px);
    color: #013927;
    font-family: "Sora", Arial, Helvetica, sans-serif;
    line-height: 1.2;
}

/*Career*/
.career-opportunities {
    padding: 40px 0 80px 0;
    background: var(--bg-light);
}

.opportunities-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 20px;
}

.opportunity-card {
    background-color: #ebfaea;
    padding: 16px;
    margin-bottom: clamp(10px, 2vw, 16px);
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
    border: 2px solid #009800;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.opportunity-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0, 152, 0, 0.2);
    border-color: var(--primary-color);
}

.opportunity-card h3 {
    font-size:clamp(16px, 2vw, 24px) ;
    font-weight: 600;
    color: #013927;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.opportunity-card p {
    font-size: clamp(14px, 2vw, 18px);
    line-height: 1.2;
    color: #013927;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

/* Footer */
.footer {
    background: #000;
    color: white;
    width: 100%;
    margin: 0;
    padding: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(30px, 8vw, 60px);
    margin-bottom: var(--small-gap);
    padding: clamp(20px, 4vw, 40px) clamp(20px, 4vw, 56px);
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
}

.footer-logo img {
    height: clamp(60px, 10vw, 90px);
    width: auto;
    transition: transform 0.3s ease;
}

.footer-logo img:hover {
    transform: scale(1.05);
}

.footer-left p {
    color: white;
    margin-bottom: clamp(15px, 3vw, 20px);
    font-size: clamp(20px, 4vw, 38px);
    line-height: 1.2;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}


.social-links {
    display: flex;
    gap: clamp(14px, 2vw, 16px);
    margin-top: clamp(15px, 3vw, 20px);
    flex-wrap: wrap;
}

.social-link {
    width: clamp(35px, 6vw, 40px);
    height: clamp(35px, 6vw, 40px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.social-link img {
    width: clamp(35px, 6vw, 40px);
    height: clamp(35px, 6vw, 40px);
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-dark);
    transform: translateY(-6px) scale(1.1);
    box-shadow: 0 10px 30px rgba(34, 197, 94, 0.3);
}

.social-link:hover img {
    transform: scale(1.2) rotate(10deg);
}

.footer-right {
    display: flex;
    gap: clamp(40px, 12vw, 160px);
    justify-content: flex-start;
    align-items: flex-start;
    padding-top: clamp(5px, 2vw, 10px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.footer-column h4 {
    color: white;
    font-size: clamp(18px, 3.5vw, 28px);
    font-weight: 600;
    margin-bottom: clamp(15px, 3vw, 20px);
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.footer-column a {
    display: block;
    color: white;
    font-size: clamp(16px, 3vw, 28px);
    font-weight: 500;
    text-decoration: none;
    margin-bottom: clamp(8px, 1.5vw, 10px);
    transition: all 0.3s ease;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.footer-column a:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.footer-bottom {
    background-color: #49f63e;
    padding: clamp(14px, 2vw, 16px) 0;
    width: 100%;
    margin: 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: clamp(10px, 2vw, 20px);
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 56px);
}

.footer-bottom p {
    font-size: clamp(14px, 2.5vw, 18px);
    color: #000;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.footer-legal {
    display: flex;
    gap: clamp(15px, 3vw, 20px);
    flex-wrap: wrap;
}

.footer-legal a {
    color: var(--text-dark);
    text-decoration: none;
    font-size: clamp(14px, 2.5vw, 18px);
    transition: all 0.3s ease;
    font-family: "Sora", Arial, Helvetica, sans-serif;
}

.footer-legal a:hover {
    color: #dcfce7;
    text-decoration: underline;
}

/* STAGGER ANIMATIONS FOR GRID ITEMS */
.values-grid .value-card:nth-child(1) { animation-delay: 0.1s; }
.values-grid .value-card:nth-child(2) { animation-delay: 0.2s; }
.values-grid .value-card:nth-child(3) { animation-delay: 0.3s; }
.values-grid .value-card:nth-child(4) { animation-delay: 0.4s; }
.values-grid .value-card:nth-child(5) { animation-delay: 0.5s; }

.impact-grid .impact-item:nth-child(1) { animation-delay: 0.1s; }
.impact-grid .impact-item:nth-child(2) { animation-delay: 0.2s; }
.impact-grid .impact-item:nth-child(3) { animation-delay: 0.3s; }

.opportunities-grid .opportunity-card:nth-child(1) { animation-delay: 0.1s; }
.opportunities-grid .opportunity-card:nth-child(2) { animation-delay: 0.3s; }
.opportunities-grid .opportunity-card:nth-child(3) { animation-delay: 0.5s; }

/* Responsive Media Queries */
@media (max-width: 1200px) {
    .different-grid {
        gap: clamp(30px, 8vw, 80px);
    }
    
    .footer-right {
        gap: clamp(30px, 8vw, 80px);
    }
    
    .values-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #000;
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-wrapper {
        padding: 0 15px;
    }

    /* Single column layouts for mobile */
    .process-grid,
    .challenge-grid,
    .environment-grid,
    .different-grid {
        grid-template-columns: 1fr;
        gap: var(--small-gap);
    }

    /* THỐNG NHẤT: Tất cả hình ảnh đều hiển thị trước trên mobile */
    .process-grid .grid-image,
    .challenge-grid .grid-image,
    .environment-grid .grid-image,
    .different-grid .different-image {
        order: -1;
    }

    .process-grid .grid-text,
    .process-grid .grid-content,
    .challenge-grid .grid-text,
    .environment-grid .grid-text,
    .different-grid .different-content {
        order: 1;
    }

    /* TỐI ƯU RIÊNG CHO DIFFERENT SECTION TRÊN MOBILE */
    .different-item {
        padding: clamp(10px, 2.5vw, 16px);
        margin-bottom: clamp(10px, 2.5vw, 16px);
        gap: clamp(8px, 2vw, 12px);
    }

    .different-icon {
        font-size: clamp(20px, 5vw, 28px);
        min-width: clamp(24px, 5vw, 32px);
    }

    .different-text h4 {
        font-size: clamp(14px, 3.5vw, 20px);
        margin-bottom: clamp(6px, 1vw, 8px);
    }

    .different-detail p {
        font-size: clamp(11px, 2.8vw, 16px);
    }

    .different-image img {
        max-width: clamp(200px, 85vw, 400px);
    }

    .vm-grid {
        grid-template-columns: 1fr;
        gap: var(--small-gap);
    }

    .values-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--small-gap);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--small-gap);
        text-align: center;
    }

    .footer-right {
        flex-direction: column;
        gap: var(--small-gap);
        align-items: center;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .different-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }

    .different-icon {
        align-self: center;
    }

    /* Disable some animations on mobile for performance */
    .grid-image img:hover,
    .different-image img:hover,
    .value-icon img:hover {
        transform: scale(1.02);
    }
}

/* Tối ưu thêm cho màn hình rất nhỏ */
@media (max-width: 480px) {
    :root {
        --container-padding: 15px;
        --section-padding: clamp(30px, 8vw, 60px);
        --grid-gap: clamp(20px, 6vw, 40px);
        --small-gap: clamp(15px, 4vw, 30px);
    }

    .hero {
        padding: clamp(80px, 15vw, 120px) 0 var(--section-padding);
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

    .impact-grid {
        grid-template-columns: 1fr;
    }

    .vm-title {
        flex-direction: column;
        gap: 10px;
    }

    .social-links {
        justify-content: center;
    }

    .footer-legal {
        justify-content: center;
    }

    .footer-bottom-content {
        padding: 0 15px;
    }

    /* DIFFERENT SECTION CHO MOBILE NHỎ */
    .different-item {
        padding: 8px 12px;
        margin-bottom: 12px;
        gap: 8px;
    }

    .different-icon {
        font-size: 20px;
        min-width: 24px;
    }

    .different-text h4 {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .different-detail p {
        font-size: 12px;
        line-height: 1.3;
    }

    .different-image img {
        max-width: 280px;
    }
}

/* Tối ưu cho màn hình cực nhỏ */
@media (max-width: 360px) {
    :root {
        --container-padding: 12px;
    }

    .hero-title,
    .hero-main {
        font-size: clamp(24px, 8vw, 32px);
    }

    .value-card {
        padding-bottom: 20px;
    }

    /* DIFFERENT SECTION CHO MOBILE CỰC NHỎ */
    .different-item {
        padding: 6px 10px;
        margin-bottom: 10px;
        gap: 6px;
    }

    .different-icon {
        font-size: 18px;
        min-width: 22px;
    }

    .different-text h4 {
        font-size: 13px;
        margin-bottom: 4px;
    }

    .different-detail p {
        font-size: 11px;
    }

    .different-image img {
        max-width: 250px;
    }
}

/* Đảm bảo desktop layout không bị ảnh hưởng */
@media (min-width: 769px) {
    .process-grid .grid-image,
    .challenge-grid .grid-image,
    .environment-grid .grid-image,
    .different-grid .different-image,
    .process-grid .grid-text,
    .process-grid .grid-content,
    .challenge-grid .grid-text,
    .environment-grid .grid-text,
    .different-grid .different-content {
        order: initial;
    }
}

/* Large screen adjustments */
@media (min-width: 1400px) {
    .container,
    .nav-wrapper {
        max-width: 1400px;
    }

    .values-grid {
        grid-template-columns: repeat(5, 1fr);
        max-width: 1600px;
    }

    /* Restore original 5-column positioning for large screens */
    .value-card:nth-child(1) {
        grid-column: 1;
        grid-row: 1;
    }

    .value-card:nth-child(2) {
        grid-column: 3;
        grid-row: 1;
    }

    .value-card:nth-child(3) {
        grid-column: 5;
        grid-row: 1;
    }

    .value-card:nth-child(4) {
        grid-column: 2;
        grid-row: 2;
    }

    .value-card:nth-child(5) {
        grid-column: 4;
        grid-row: 2;
    }
}

/* Animation and interaction improvements */
@media (prefers-reduced-motion: no-preference) {
    .value-card,
    .impact-item,
    .different-item {
        transition: transform 0.3s ease;
    }

    .value-card:hover,
    .impact-item:hover {
        transform: translateY(-5px);
    }
}

/* Reduce animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .vm-icon img {
        animation: none;
    }
}

/* Focus styles for accessibility */
.nav-link:focus-visible,
.signup-btn:focus-visible,
.cta-button2:focus-visible,
.social-link:focus-visible,
.footer-column a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .footer {
        display: none;
    }

    .hero {
        margin-top: 0;
        padding: 20px 0;
        background: white;
        color: black;
    }

    .section {
        padding: 20px 0;
    }

    .different-item,
    .value-card,
    .impact-item {
        break-inside: avoid;
    }

    /* Remove animations for print */
    * {
        animation: none !important;
        transition: none !important;
    }
}