/* ===== Reset & Variables ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-white: #ffffff;
    --color-light-gray: #f5f5f5;
    --color-medium-gray: #e0e0e0;
    --color-gray: #9e9e9e;
    --color-dark-gray: #424242;
    --color-darker-gray: #212121;
    --color-accent: #607d8b;
    --color-accent-hover: #455a64;
    --color-text: #333333;
    --color-text-light: #666666;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-medium: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-darker-gray);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
}

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

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

.title-underline {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    margin: var(--spacing-sm) auto var(--spacing-md);
    border-radius: 2px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: var(--color-light-gray);
    color: var(--color-darker-gray);
}

.btn-secondary:hover {
    background-color: var(--color-medium-gray);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-fast);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-darker-gray);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

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

/* ===== Hero Section ===== */
.hero {
    padding: calc(80px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-light-gray) 0%, var(--color-white) 100%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    animation: fadeInLeft 1s ease;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.hero-text {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-image {
    animation: fadeInRight 1s ease;
}

.image-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--color-medium-gray);
}

.image-wrapper::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    border-radius: 12px;
    z-index: -1;
}

.image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-medium);
}

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

/* ===== About Section ===== */
.about {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-white);
}

.about-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.125rem;
    color: var(--color-text);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.about-card {
    background-color: var(--color-light-gray);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.about-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

/* Enhanced About Card Content Styling */
.about-content-list {
    margin-top: var(--spacing-sm);
}

.about-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    padding: 0.75rem;
    background-color: var(--color-white);
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: all var(--transition-fast);
}

.about-item:last-child {
    margin-bottom: 0;
}

.about-item:hover {
    transform: translateX(3px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    border-left-color: var(--color-accent-hover);
}

.about-item i {
    color: var(--color-accent);
    font-size: 0.875rem;
    margin-top: 0.125rem;
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.about-item:hover i {
    color: var(--color-accent-hover);
}

.item-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.item-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-darker-gray);
    line-height: 1.4;
    margin: 0;
}

.item-description {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin: 0;
    font-style: italic;
}

/* Specific card type enhancements */
.education-card .about-item {
    border-left-color: #4CAF50;
}

.education-card .about-item i {
    color: #4CAF50;
}

.education-card .about-item:hover {
    border-left-color: #388E3C;
}

.education-card .about-item:hover i {
    color: #388E3C;
}

.experience-card .about-item {
    border-left-color: #2196F3;
}

.experience-card .about-item i {
    color: #2196F3;
}

.experience-card .about-item:hover {
    border-left-color: #1976D2;
}

.experience-card .about-item:hover i {
    color: #1976D2;
}

.current-work-card .about-item {
    border-left-color: #FF9800;
}

.current-work-card .about-item i {
    color: #FF9800;
}

.current-work-card .about-item:hover {
    border-left-color: #F57C00;
}

.current-work-card .about-item:hover i {
    color: #F57C00;
}

.about-mission {
    display: flex;
    gap: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-light-gray), var(--color-white));
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.mission-icon {
    font-size: 3rem;
    color: var(--color-accent);
    flex-shrink: 0;
}

.mission-content h3 {
    margin-bottom: var(--spacing-sm);
}

.mission-content p {
    color: var(--color-text-light);
    font-size: 1.125rem;
    line-height: 1.7;
}

/* ===== Services Section ===== */
.services {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-light-gray);
}

.services-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    font-size: 1.125rem;
    color: var(--color-text);
}

.alo-meaning {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.alo-letter {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    text-align: center;
    transition: all var(--transition-fast);
}

.alo-letter:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.letter-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
}

.alo-letter h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

.alo-letter p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

.services-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

.feature-card p {
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: 1.7;
}

.cta-box {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.cta-box h3 {
    color: var(--color-white);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.cta-box .btn-primary {
    background-color: var(--color-white);
    color: var(--color-accent);
}

.cta-box .btn-primary:hover {
    background-color: var(--color-light-gray);
    color: var(--color-accent-hover);
}

/* ===== Contact Section ===== */
.contact {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--color-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-card {
    background-color: var(--color-light-gray);
    padding: var(--spacing-md);
    border-radius: 8px;
    text-align: center;
    transition: all var(--transition-fast);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto var(--spacing-sm);
}

.contact-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-darker-gray);
}

.contact-card a {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-accent);
}

.contact-card a:hover {
    color: var(--color-accent-hover);
}

.contact-card p {
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-accent);
    color: var(--color-white);
    border-radius: 20px;
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.social-section {
    text-align: center;
    background: linear-gradient(135deg, var(--color-light-gray), var(--color-white));
    padding: var(--spacing-lg);
    border-radius: 12px;
}

.social-section h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-darker-gray);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 1.125rem;
    transition: all var(--transition-fast);
    color: var(--color-white);
}

.social-link i {
    font-size: 1.5rem;
}

.social-link.youtube {
    background-color: #FF0000;
}

.social-link.youtube:hover {
    background-color: #CC0000;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.social-link.facebook {
    background-color: #1877F2;
}

.social-link.facebook:hover {
    background-color: #0d5dbf;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.social-link.linkedin {
    background-color: #0A66C2;
}

.social-link.linkedin:hover {
    background-color: #004182;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-darker-gray);
    color: var(--color-light-gray);
    padding: var(--spacing-md);
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===== Back to Top Button ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: 999;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

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

/* ===== Animations ===== */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-image {
        order: -1;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .about-mission {
        flex-direction: column;
        text-align: center;
    }
    
    .mission-icon {
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-white);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: transform var(--transition-fast);
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero {
        padding-top: calc(70px + var(--spacing-md));
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .social-links {
        flex-direction: column;
    }
    
    .social-link {
        width: 100%;
        justify-content: center;
    }
}