/* IBM Carbon Design System Inspired Styles */

:root {
    --ibm-blue: #0f62fe;
    --background-white: #ffffff;
    --background-gray: #f4f4f4;
    --text-primary: #161616;
    --text-secondary: #525252;
    --border-subtle: #e0e0e0;
    /* Updated to include Thai font with fallbacks */
    --font-family: 'IBM Plex Sans Thai', 'IBM Plex Sans', 'Sarabun', 'Krub', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--background-white);
    line-height: 1.6; /* Adjusted for Thai language readability */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* --- General Components --- */

a {
    color: var(--ibm-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

section.bg-gray {
    background-color: var(--background-gray);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family);
    font-weight: 600;
    line-height: 1.3;
}

h2.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

p.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px; /* Increased width for Thai verbosity */
    margin-bottom: 4rem;
}

.btn {
    display: inline-block;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    padding: 1rem 2rem;
    border-radius: 0;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
    background-color: var(--ibm-blue);
    color: var(--background-white);
}

.btn-primary:hover {
    background-color: #0043ce;
    text-decoration: none;
}

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

.btn-secondary:hover {
    background-color: var(--ibm-blue);
    color: var(--background-white);
    text-decoration: none;
}

/* --- Header --- */
header {
    background-color: var(--background-white);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.05em; /* Gives a more compact, logo-like feel */
}

.logo a:hover {
    color: var(--ibm-blue);
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav ul a {
    color: var(--text-primary);
    font-weight: 500;
    text-decoration: none;
}

nav ul a:hover {
    color: var(--ibm-blue);
}

/* --- Mobile Navigation --- */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    background: none;
    border: none;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Prevent body scroll when nav is open */
body.nav-open {
    overflow: hidden;
}

/* --- Hero Section --- */
.hero {
    padding: 8rem 0;
    text-align: left;
}

.hero h1 {
    font-size: 3.2rem; /* Slightly adjusted for bilingual text */
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1.5rem;
    max-width: 700px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

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

.service-card-ibm {
    background-color: var(--background-white);
    padding: 2.5rem 2rem;
    border-top: 4px solid var(--ibm-blue);
    transition: background-color 0.2s ease, transform 0.2s ease;
    display: flex;
    flex-direction: column;
}

.service-card-ibm:hover {
    background-color: #f9f9f9;
    transform: translateY(-5px);
}

.service-card-ibm .icon {
    font-size: 2.5rem;
    color: var(--ibm-blue);
    margin-bottom: 1.5rem;
}

.service-card-ibm h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.service-card-ibm p {
    color: var(--text-secondary);
    flex-grow: 1;
}

/* --- Process Section --- */
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.process-card {
    background-color: var(--background-white);
    padding: 2.5rem 2rem;
    text-align: left;
    border: 1px solid var(--border-subtle);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.process-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.process-card .icon {
    font-size: 2.5rem;
    color: var(--ibm-blue);
    margin-bottom: 1.5rem;
}

.process-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.process-card p {
    color: var(--text-secondary);
}

/* --- Expertise Section --- */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.expertise-card {
    background-color: var(--background-white); /* Changed to white */
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    border: 1px solid var(--border-subtle);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.expertise-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.expertise-card .icon {
    font-size: 2.5rem;
    color: var(--ibm-blue);
    margin-bottom: 1.5rem;
}

.expertise-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.expertise-card p {
    color: var(--text-secondary);
    flex-grow: 1;
}

/* --- Contact Section --- */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 6rem;
    align-items: flex-start;
}

.contact-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.contact-info p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    font-size: 1.1rem;
}

.contact-info i {
    margin-right: 15px;
    color: var(--ibm-blue);
    width: 25px;
}

#contact-form .input-group {
    margin-bottom: 1.5rem;
}

#contact-form label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

#contact-form input, #contact-form textarea {
    width: 100%;
    padding: 1rem;
    font-family: var(--font-family);
    font-size: 1rem;
    background-color: var(--background-gray);
    border: 2px solid transparent;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

#contact-form input:focus, #contact-form textarea:focus {
    outline: none;
    border-color: var(--ibm-blue);
    background-color: var(--background-white);
}

/* Form Error States */
#contact-form .input-group.error input,
#contact-form .input-group.error textarea {
    border-color: #da1e28;
    background-color: #fff1f1;
}

#contact-form .error-message {
    display: block;
    color: #da1e28;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    font-weight: 500;
}

#contact-form .form-status {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    font-weight: 500;
    display: none;
}

#contact-form .form-status.success {
    background-color: #e8f5e8;
    color: #1e7e1e;
    border: 1px solid #1e7e1e;
}

#contact-form .form-status.error {
    background-color: #fff1f1;
    color: #da1e28;
    border: 1px solid #da1e28;
}

#contact-form .form-status.info {
    background-color: #e5f6ff;
    color: #0f62fe;
    border: 1px solid #0f62fe;
}

/* Button Loading State */
#submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#submit-btn .btn-loading {
    display: none;
}

/* Form Animation */
#contact-form .input-group {
    position: relative;
    transition: all 0.3s ease;
}

#contact-form .input-group.error {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Focus Animation */
#contact-form input,
#contact-form textarea {
    transition: all 0.2s ease;
}

#contact-form input:focus,
#contact-form textarea:focus {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(15, 98, 254, 0.15);
}

/* --- About Page --- */
#about-hero {
    padding: 6rem 0;
}

.about-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 5rem;
    align-items: flex-start;
}

.about-main-content h2, .about-main-content h3 {
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.about-main-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.about-sidebar {
    background-color: var(--background-gray);
    padding: 2rem;
}

.about-sidebar h3 {
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.about-sidebar ul {
    list-style: none;
}

.about-sidebar li {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.about-sidebar li strong {
    color: var(--text-primary);
    display: block;
}


/* --- Footer --- */
footer {
    background-color: var(--text-primary);
    color: var(--background-gray);
    padding: 4rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-col h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--background-white);
}

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

.footer-col li {
    margin-bottom: 1rem;
}

.footer-col a {
    color: var(--background-gray);
    text-decoration: none;
}

.footer-col a:hover {
    color: var(--ibm-blue);
    text-decoration: none;
}

.footer-socials a {
    margin-right: 1.5rem;
    font-size: 1.2rem;
}

.footer-bottom {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--text-secondary);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}


/* --- Animations and Transitions --- */

/* Smooth Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Fade In Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Slide In Left Animation */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Slide In Right Animation */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Scale In Animation */
@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Hero Section Animations */
.hero h1 {
    animation: fadeIn 1s ease-out;
}

.hero p {
    animation: fadeIn 1s ease-out 0.3s both;
}

.hero-buttons {
    animation: fadeIn 1s ease-out 0.6s both;
}

/* Section Animations */
section {
    position: relative;
    overflow: hidden;
}

.section-title {
    animation: fadeIn 0.8s ease-out;
}

.section-subtitle {
    animation: fadeIn 0.8s ease-out 0.2s both;
}

/* Service Cards Animation */
.service-card-ibm {
    animation: fadeIn 0.8s ease-out;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.service-card-ibm:nth-child(1) { animation-delay: 0.1s; }
.service-card-ibm:nth-child(2) { animation-delay: 0.2s; }
.service-card-ibm:nth-child(3) { animation-delay: 0.3s; }
.service-card-ibm:nth-child(4) { animation-delay: 0.4s; }

.service-card-ibm:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 24px rgba(15, 98, 254, 0.15);
}

.service-card-ibm .icon {
    transition: all 0.3s ease;
}

.service-card-ibm:hover .icon {
    transform: scale(1.1) rotate(5deg);
    color: #0043ce;
}

/* Process Cards Animation */
.process-card {
    animation: slideInUp 0.8s ease-out;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.process-card:nth-child(1) { animation-delay: 0.1s; }
.process-card:nth-child(2) { animation-delay: 0.2s; }
.process-card:nth-child(3) { animation-delay: 0.3s; }
.process-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.process-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 16px 32px rgba(15, 98, 254, 0.2);
}

.process-card .icon {
    transition: all 0.3s ease;
}

.process-card:hover .icon {
    transform: scale(1.15);
    color: #0043ce;
}

/* Expertise Cards Animation */
.expertise-card {
    animation: fadeIn 0.8s ease-out;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.expertise-card:nth-child(1) { animation-delay: 0.1s; }
.expertise-card:nth-child(2) { animation-delay: 0.2s; }

.expertise-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 24px rgba(15, 98, 254, 0.15);
}

.expertise-card .icon {
    transition: all 0.3s ease;
}

.expertise-card:hover .icon {
    transform: scale(1.1);
    color: #0043ce;
}

/* Button Animations */
.btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(15, 98, 254, 0.3);
}

.btn-primary:hover {
    background-color: #0043ce;
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(15, 98, 254, 0.3);
}

.btn-secondary:hover {
    background-color: var(--ibm-blue);
    color: var(--background-white);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(15, 98, 254, 0.3);
}

/* Navigation Animations */
nav ul a {
    transition: all 0.3s ease;
    position: relative;
}

nav ul a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--ibm-blue);
    transition: width 0.3s ease;
}

nav ul a:hover::after {
    width: 100%;
}

nav ul a:hover {
    color: var(--ibm-blue);
    transform: translateY(-1px);
}

/* Logo Animation */
.logo a {
    transition: all 0.3s ease;
}

.logo a:hover {
    color: var(--ibm-blue);
    transform: scale(1.05);
}

/* Footer Links Animation */
.footer-col a {
    transition: all 0.3s ease;
    position: relative;
}

.footer-col a:hover {
    color: var(--ibm-blue);
    transform: translateX(5px);
}

/* Social Media Icons Animation */
.footer-socials a {
    transition: all 0.3s ease;
}

.footer-socials a:hover {
    transform: translateY(-3px) scale(1.1);
    color: var(--ibm-blue);
}

/* Scroll Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

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

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s infinite;
}

/* --- Loading States and Micro-interactions --- */

/* Page Loading Animation */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--background-white);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.page-loader-content {
    text-align: center;
}

.page-loader-logo {
    font-size: 3rem;
    font-weight: 600;
    color: var(--ibm-blue);
    margin-bottom: 1rem;
    animation: pulse 1.5s infinite;
}

.page-loader-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton-text {
    height: 1.2rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}

.skeleton-title {
    height: 2rem;
    width: 60%;
    margin-bottom: 1rem;
    border-radius: 4px;
}

.skeleton-card {
    height: 200px;
    border-radius: 8px;
    margin-bottom: 1rem;
}

/* Progress Indicators */
.progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--background-gray);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--ibm-blue);
    border-radius: 2px;
    transition: width 0.3s ease;
    animation: progressPulse 2s infinite;
}

@keyframes progressPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.hover-glow {
    transition: all 0.3s ease;
}

.hover-glow:hover {
    box-shadow: 0 0 20px rgba(15, 98, 254, 0.3);
}

/* Button Loading State */
.btn.loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Form Micro-interactions */
.input-group {
    position: relative;
}

.input-group.focused label {
    color: var(--ibm-blue);
    transform: translateY(-2px);
}

.input-group.filled input,
.input-group.filled textarea {
    background-color: #f8f9fa;
}

/* Success/Error States */
.success-checkmark {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-block;
    stroke-width: 2;
    stroke: #1e7e1e;
    stroke-miterlimit: 10;
    box-shadow: inset 0px 0px 0px #1e7e1e;
    animation: fill .4s ease-in-out .4s forwards, scale .3s ease-in-out .9s both;
}

.success-checkmark__circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 2;
    stroke-miterlimit: 10;
    stroke: #1e7e1e;
    fill: none;
    animation: stroke 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.success-checkmark__check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: stroke 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke {
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes scale {
    0%, 100% {
        transform: none;
    }
    50% {
        transform: scale3d(1.1, 1.1, 1);
    }
}

@keyframes fill {
    100% {
        box-shadow: inset 0px 0px 0px 30px #1e7e1e;
    }
}

/* Notification Toast */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--background-white);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 1rem;
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid #1e7e1e;
}

.toast.error {
    border-left: 4px solid #da1e28;
}

.toast.info {
    border-left: 4px solid var(--ibm-blue);
}

.toast-icon {
    font-size: 1.2rem;
}

.toast.success .toast-icon {
    color: #1e7e1e;
}

.toast.error .toast-icon {
    color: #da1e28;
}

.toast.info .toast-icon {
    color: var(--ibm-blue);
}

/* Card Flip Animation */
.card-flip {
    perspective: 1000px;
}

.card-flip-inner {
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card-flip.flipped .card-flip-inner {
    transform: rotateY(180deg);
}

.card-flip-front, .card-flip-back {
    backface-visibility: hidden;
}

.card-flip-back {
    transform: rotateY(180deg);
}

/* Typing Effect */
.typing-effect {
    overflow: hidden;
    border-right: 2px solid var(--ibm-blue);
    white-space: nowrap;
    animation: typing 3.5s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--ibm-blue) }
}

/* --- Performance Optimizations --- */

/* CSS Performance Improvements */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* GPU Acceleration for animations */
.gpu-accelerated {
    transform: translateZ(0);
    will-change: transform;
}

/* Optimize images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Optimize font loading - Note: Using Google Fonts with font-display: swap */
/* Google Fonts automatically handles font-display: swap for better performance */

/* Reduce paint on scroll */
.service-card-ibm,
.process-card,
.expertise-card {
    contain: layout style paint;
}

/* Optimize animations */
.service-card-ibm,
.process-card,
.expertise-card {
    transform: translateZ(0); /* Enable hardware acceleration */
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Optimize scroll performance */
html {
    scroll-behavior: smooth;
    overflow-anchor: none; /* Disable scroll anchoring for better performance */
}

/* Lazy loading placeholder */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* Optimize button rendering */
.btn {
    contain: layout style;
    transform: translateZ(0);
}

/* Reduce reflows */
.container {
    contain: layout;
}

/* Optimize form inputs */
input, textarea {
    contain: layout style;
}

/* Performance monitoring */
.performance-indicator {
    position: fixed;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 12px;
    z-index: 9999;
    font-family: monospace;
}

/* --- Accessibility Features --- */

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--ibm-blue);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 4px 4px;
    font-weight: 600;
}

.skip-to-main:focus {
    top: 0;
}

/* Focus indicators */
*:focus {
    outline: 2px solid var(--ibm-blue);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #000000;
        --background-white: #ffffff;
        --background-gray: #f0f0f0;
        --border-subtle: #000000;
    }
    
    .btn {
        border: 2px solid var(--text-primary);
    }
    
    .service-card-ibm,
    .process-card,
    .expertise-card {
        border: 2px solid var(--text-primary);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .service-card-ibm:hover,
    .process-card:hover,
    .expertise-card:hover {
        transform: none;
    }
    
    .btn:hover {
        transform: none;
    }
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Enhanced focus styles */
.btn:focus,
input:focus,
textarea:focus,
nav a:focus {
    outline: 3px solid var(--ibm-blue);
    outline-offset: 2px;
    box-shadow: 0 0 0 2px rgba(15, 98, 254, 0.3);
}

/* Keyboard navigation indicators */
.keyboard-nav *:focus {
    outline: 3px solid #ff6600;
    outline-offset: 2px;
}

/* ARIA live regions */
.aria-live {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Color contrast improvements */
.text-secondary {
    color: #333333; /* Darker for better contrast */
}

.error-message {
    color: #d32f2f;
    font-weight: 600;
}

.form-status.success {
    background-color: #e8f5e8;
    color: #2e7d32;
    border: 2px solid #2e7d32;
}

.form-status.error {
    background-color: #ffebee;
    color: #c62828;
    border: 2px solid #c62828;
}

/* Responsive --- */

/* Ensure Thai text displays correctly */
.thai-text {
    font-family: 'IBM Plex Sans Thai', 'Sarabun', 'Krub', sans-serif;
}

/* Improve Thai text rendering */
html[lang="th"] {
    font-family: 'IBM Plex Sans Thai', 'Sarabun', 'Krub', sans-serif;
}

/* Specific Thai text improvements */
.thai-heading {
    font-family: 'IBM Plex Sans Thai', 'Sarabun', 'Krub', sans-serif;
    font-weight: 600;
    line-height: 1.4;
}

.thai-paragraph {
    font-family: 'IBM Plex Sans Thai', 'Sarabun', 'Krub', sans-serif;
    line-height: 1.7;
    word-spacing: 0.05em;
}

@media (max-width: 1200px) {
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .contact-wrapper { grid-template-columns: 1fr; gap: 4rem; }
    .about-wrapper { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    header .container {
        position: relative;
    }
    
    #main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--background-white);
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 1000;
        padding: 5rem 2rem 2rem;
        overflow-y: auto;
    }
    
    #main-nav.active {
        right: 0;
    }
    
    #main-nav ul {
        flex-direction: column;
        gap: 1.5rem;
        align-items: flex-start;
    }
    
    #main-nav ul a {
        font-size: 1.1rem;
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-subtle);
        width: 100%;
    }
    
    #main-nav ul a.btn {
        border: 1px solid var(--ibm-blue);
        text-align: center;
        margin-top: 1rem;
        padding: 1rem;
        border-radius: 0;
    }
    
    .hero { text-align: center; }
    .hero-buttons { justify-content: center; }
    .process-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .services-grid { grid-template-columns: 1fr; }
    .expertise-grid { grid-template-columns: 1fr;}
}