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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #2d3748;
    background-color: #ffffff;
    overflow-x: hidden;
}

/* ======================
   CSS VARIABLES
   ====================== */
:root {
    /* Primary Colors - Based on INNO Group branding */
    --color-primary: #1a365d;
    --color-primary-light: #2d3748;
    --color-primary-dark: #0f1419;
    --color-secondary: #e53e3e;
    --color-secondary-light: #feb2b2;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ======================
   UTILITY CLASSES
   ====================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.025em;
}

.section__subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    white-space: nowrap;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.hidden {
    display: none;
}

/* ======================
   HEADER & NAVIGATION
   ====================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 1000;
    transition: var(--transition-base);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    position: relative;
}

.nav__brand {
    flex-shrink: 0;
}

.nav__logo {
    height: 60px;
    width: auto;
}

.nav__menu {
    display: flex;
    align-items: center;
}

.nav__list {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0;
}

.nav__link {
    color: var(--color-gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-base);
    position: relative;
}

.nav__link:hover {
    color: var(--color-primary);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-base);
}

.nav__link:hover::after {
    width: 100%;
}

/* Language Picker */
.language-picker {
    position: relative;
    margin-left: var(--spacing-lg);
}

.language-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: none;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    transition: var(--transition-base);
}

.language-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-base);
    z-index: 100;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    display: block;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--color-gray-700);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
}

.language-option:hover,
.language-option.active {
    background-color: var(--color-gray-50);
    color: var(--color-primary);
}

.nav__toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-gray-700);
    cursor: pointer;
}

/* ======================
   HERO SECTION
   ====================== */
.hero {
    padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(26, 54, 93, 0.05) 100%);
    z-index: 1;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero__content {
    max-width: 600px;
}

.hero__badge {
    display: inline-block;
    background-color: var(--color-gray-100);
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    border: 1px solid var(--color-gray-200);
    letter-spacing: 0.025em;
}

.hero__title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.025em;
}

.hero__description {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

.hero__actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__visual {
    width: 100%;
    height: 400px;
    background-image: url('../images/hero-business-meeting.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero__visual::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26, 54, 93, 0.1) 0%, rgba(26, 54, 93, 0.05) 100%);
    border-radius: var(--radius-xl);
}

/* ======================
   ABOUT SECTION
   ====================== */
.about {
    background-color: var(--color-white);
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.about__item {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background-color: var(--color-gray-50);
    transition: var(--transition-base);
}

.about__item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about__icon {
    width: 80px;
    height: 80px;
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.about__icon i {
    font-size: var(--font-size-2xl);
    color: var(--color-white);
}

.about__item h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.about__item p {
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ======================
   SERVICES SECTION
   ====================== */
.services {
    background-color: var(--color-gray-50);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.service__card {
    background-color: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    border-top: 4px solid var(--color-primary);
}

.service__card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.service__icon {
    width: 60px;
    height: 60px;
    background-color: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.service__icon i {
    font-size: var(--font-size-xl);
    color: var(--color-white);
}

.service__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.service__description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.service__list {
    list-style: none;
    padding: 0;
}

.service__list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-gray-700);
    position: relative;
    padding-left: var(--spacing-lg);
    line-height: 1.5;
}

.service__list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: var(--spacing-xs);
    color: var(--color-primary);
    font-weight: bold;
}

/* ======================
   WHY US SECTION
   ====================== */
.why-us {
    background-color: var(--color-white);
}

.why-us__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.why-us__item {
    text-align: center;
    padding: var(--spacing-lg);
}

.why-us__icon {
    width: 70px;
    height: 70px;
    background-color: var(--color-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.why-us__icon i {
    font-size: var(--font-size-xl);
    color: var(--color-white);
}

.why-us__item h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.why-us__item p {
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ======================
   CLIENTS SECTION
   ====================== */
.clients {
    background-color: var(--color-gray-50);
    padding: var(--spacing-2xl) 0;
}

.clients__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
}

.client__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    height: 100px;
}

.client__logo:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.client__logo img {
    max-width: 150px;
    max-height: 65px;
    width: auto;
    height: auto;
    filter: grayscale(100%);
    transition: var(--transition-base);
    object-fit: contain;
}

/* Specific adjustments for logos that need sizing */
.client__logo img[alt="KIND"] {
    max-width: 180px;
    max-height: 75px;
}

.client__logo img[alt="Galaxia Money Tree"] {
    max-width: 160px;
    max-height: 70px;
}

.client__logo img[alt="Hwaseung Enterprise"] {
    max-width: 170px;
    max-height: 70px;
}

.client__logo img[alt="Orion"] {
    max-width: 160px;
    max-height: 65px;
}

.client__logo img[alt="Ministry of Health and Welfare"] {
    max-width: 160px;
    max-height: 70px;
}

.client__logo:hover img {
    filter: grayscale(0%);
    transform: scale(1.05);
}

/* ======================
   CONTACT SECTION
   ====================== */
.contact {
    background-color: var(--color-white);
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact__info {
    space-y: var(--spacing-xl);
}

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact__icon {
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact__icon i {
    color: var(--color-white);
    font-size: var(--font-size-lg);
}

.contact__item h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.contact__item p {
    color: var(--color-gray-600);
    line-height: 1.5;
}

.contact__item a {
    color: var(--color-primary);
    text-decoration: none;
}

.contact__item a:hover {
    text-decoration: underline;
}

.contact__offices {
    margin-top: var(--spacing-xl);
}

.contact__offices h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.office {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-md);
}

.office h5 {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.office p {
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

/* Contact Form */
.contact__form {
    background-color: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form__group {
    margin-bottom: var(--spacing-lg);
}

.form__group label {
    display: block;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-xs);
}

.form__group input,
.form__group select,
.form__group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    background-color: var(--color-white);
}

.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
}

.form__group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Form Messages */
.form-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideInFromTop 0.5s ease-out;
}

.form-message--success {
    background-color: #d1fae5;
    border: 1px solid #a7f3d0;
    color: #065f46;
}

.form-message--error {
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.form-message i {
    font-size: 1.25rem;
}

.form-message p {
    margin: 0;
    flex: 1;
}

@keyframes slideInFromTop {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ======================
   FOOTER
   ====================== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-xl);
}

.footer__brand {
    max-width: 400px;
}

.footer__logo {
    height: 50px;
    width: auto;
    margin-bottom: var(--spacing-md);
    filter: brightness(0) invert(1);
    display: block;
}

.footer__brand p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.footer__column h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer__column ul {
    list-style: none;
}

.footer__column li {
    margin-bottom: var(--spacing-xs);
}

.footer__column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-base);
}

.footer__column a:hover {
    color: var(--color-white);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

/* ======================
   RESPONSIVE DESIGN
   ====================== */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero__container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero__title {
        font-size: var(--font-size-4xl);
    }
    
    .contact__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
}

@media (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-white);
        border-top: 1px solid var(--color-gray-200);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
        z-index: 1000;
    }
    
    .nav__menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav__list {
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-lg);
    }
    
    .nav__toggle {
        display: block;
    }
    
    .language-picker {
        margin-left: var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section__title {
        font-size: var(--font-size-3xl);
    }
    
    .hero {
        padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    }
    
    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .hero__description {
        font-size: var(--font-size-lg);
    }
    
    .services__grid,
    .about__grid {
        grid-template-columns: 1fr;
    }
    
    .why-us__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .clients__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero__title {
        font-size: var(--font-size-2xl);
    }
    
    .section__title {
        font-size: var(--font-size-2xl);
    }
    
    .why-us__grid {
        grid-template-columns: 1fr;
    }
    
    .clients__grid {
        grid-template-columns: 1fr;
    }
    
    .hero__badge {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

/* ======================
   ACCESSIBILITY
   ====================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-gray-400: #000000;
        --color-gray-600: #000000;
    }
}

/* ======================
   ANIMATIONS
   ====================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling for anchor links */
html {
    scroll-padding-top: 100px;
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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