/* ===== VARIABLES ===== */

.google-form-embed {
    border-radius: var(--border-radius-md);
    background-color: var(--color-bg-card);
}


:root {
     /* Colors */
    --color-bg-primary: #0C0C0F;
    --color-bg-card: #131419;
    --color-bg-card-alt: #0F1014;
    
    /* Thay đổi màu chủ đạo từ cyan sang đỏ cam */
    --color-accent: #ff4a36;
    
    /* New 4-Color Gradient với màu chủ đạo mới */
    --color-grad-1: #ff4a36; /* Màu chính */
    --color-grad-2: #ff6e54; /* Sáng hơn */
    --color-grad-3: #ff9776; /* Sáng hơn nữa */
    --color-grad-4: #ffbc9c; /* Sáng nhất */
    
    --gradient-heading-4color: linear-gradient(90deg, var(--color-grad-1) 0%, var(--color-grad-2) 33%, var(--color-grad-3) 66%, var(--color-grad-4) 100%);
    --gradient-heading-4color-hover: linear-gradient(270deg, var(--color-grad-1) 0%, var(--color-grad-2) 33%, var(--color-grad-3) 66%, var(--color-grad-4) 100%);
    
        /* Text Colors */
    --color-text-primary: #FFFFFF;
    --color-text-secondary: #B0B4C3;
    --color-text-muted: #7A8194;
    
    /* Border Colors */
    --color-border-light: rgba(255, 255, 255, 0.1);
    --color-border-medium: rgba(255, 255, 255, 0.15);
    --color-border-accent: var(--color-accent);
    
    /* Typography */
    --font-main: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    --line-height: 1.75;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
    
    /* Borders */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.3);
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-primary);
    color: var(--color-text-secondary);
    line-height: var(--line-height);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
}

h2 {
    font-size: 2.25rem;
    font-weight: 700;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
}

h4 {
    font-size: 1.25rem;
    font-weight: 500;
}

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

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

a:hover {
    color: var(--color-text-primary);
}

ul {
    list-style: none;
}

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

button, input, textarea {
    font-family: var(--font-main);
}

/* ===== CONTAINER ===== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== SECTION STYLING ===== */
.section {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

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

.section-title {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-xs);
    letter-spacing: 1px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--color-accent);
    border-radius: 2px;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: var(--spacing-sm) auto 0;
}

/* ===== DARK CARD ===== */
.dark-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.dark-card:hover {
    border-color: var(--color-border-medium);
    box-shadow: 0 0 20px rgba(255, 74, 54, 0.1); /* Thay đổi màu shadow */
    transform: translateY(-3px);
}

/* ===== ANIMATED GRADIENT TEXT (H1 ONLY) ===== */
.animated-gradient-text {
    color: #0000; /* Transparent text */
    background: linear-gradient(90deg, #f8b195, #f67280, #c06c84, #6c5b7b) 0 0 / 200%;
    -webkit-background-clip: text;
    background-clip: text;
    animation: 8s linear infinite gradient-shift;
}

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
    border: none;
    font-size: 1rem;
}

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

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

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--color-border-medium);
    color: var(--color-text-primary);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-gradient {
    background: var(--gradient-heading-4color);
    color: var(--color-text-primary);
    border: none;
}

.btn-gradient:hover {
    background: var(--gradient-heading-4color-hover);
    color: var(--color-text-primary);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(108, 91, 123, 0.4);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* ===== NAVBAR ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all var(--transition-normal);
    background-color: rgba(12, 12, 15, 0.8);
    backdrop-filter: blur(10px);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 0;
}

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-link {
    margin: 0 var(--spacing-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

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

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

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ===== HERO SECTION ===== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: var(--spacing-lg);
}
/* Container */
.hero-section .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.hero-text {
    flex: 1;
}


/* Tiêu đề chính */
.slogan {
    font-size: 72px;
    line-height: 1.1;
    font-weight: 800;
    text-align: center;
    margin-bottom: 24px;
    background: var(--gradient-heading-4color);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

/* Mô tả */
.describe {
    max-width: 700px;
    font-size: 18px;
    line-height: 1.6;
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease 0.2s forwards;
}


.name-title {
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
    display: table-caption;
    padding-right: 8px;
  
}

.hero-description {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    max-width: 600px;
}

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

.hero-image {
    flex: 1;
    max-width: 400px;
}

.profile-image {
    border-radius: 50%;
    border: 4px solid rgba(255, 74, 54, 0.2); /* Thay đổi từ cyan sang đỏ cam */
    filter: drop-shadow(0 0 15px rgba(255, 74, 54, 0.15));
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.about-text {
    flex: 2;
}

.key-facts {
    flex: 1;
}

.key-facts ul {
    margin-top: var(--spacing-sm);
}

.key-facts li {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: flex-start;
}

.key-facts i {
    color: var(--color-accent);
    margin-right: var(--spacing-xs);
    margin-top: 5px;
}

/* ===== EXPERTISE SECTION ===== */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.expertise-card {
   // text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.expertise-icon {
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.expertise-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* ===== EXPERIENCE SECTION ===== */
/* Timeline với mốc thời gian xen kẽ trái-phải */
.timeline {
    position: relative;
    max-width: 1400px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    height: 100%;
    width: 2px;
    background-color: var(--color-border-medium);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    width: 50%;
    margin-bottom: var(--spacing-lg);
    clear: both;
}

.timeline-item:nth-child(odd) {
    float: left;
    padding-right: var(--spacing-xl);
   // text-align: right;
}

.timeline-item:nth-child(even) {
    float: right;
    padding-left: var(--spacing-xl);
    text-align: left;
}

.timeline-marker {
    position: absolute;
    top: 10px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-accent);
    border: 3px solid var(--color-bg-primary);
    z-index: 1;
}

.timeline-item:nth-child(odd) .timeline-marker {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-marker {
    left: -8px;
}

/* Add a clearfix after the timeline */
.timeline::after {
    content: "";
    display: table;
    clear: both;
}

/* Adjust header, content alignment based on side */
.timeline-item:nth-child(odd) .timeline-header {
    justify-content: flex-end;
}

.timeline-item:nth-child(odd) .timeline-content {
  //  text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    text-align: left;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 60px !important;
        padding-right: 0 !important;
        text-align: left !important;
        float: none;
    }
    
    .timeline-item:nth-child(odd) .timeline-marker,
    .timeline-item:nth-child(even) .timeline-marker {
        left: 12px;
        right: auto;
    }
    
    .timeline-item:nth-child(odd) .timeline-header,
    .timeline-item:nth-child(even) .timeline-header {
        justify-content: flex-start;
    }
    
    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        text-align: left;
    }
}

/* Glowing effect for timeline marker when active */
.timeline-item:hover .timeline-marker {
    box-shadow: 0 0 15px var(--color-accent), 0 0 5px var(--color-accent);
    background-color: var(--color-accent);
}

/* Portfolio card hover effect */
.portfolio-card {
    position: relative;
    overflow: hidden;
}

.portfolio-card::before {
    content: '';
    position: absolute;
    top: -100%;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, transparent, rgba(255, 74, 54, 0.3), transparent);
    transition: all 0.8s ease;
}

.portfolio-card:hover::before {
    top: 100%;
    left: 100%;
}

/* Progress bar animation for skills */
@keyframes fillProgress {
    from { width: 0; }
    to { width: var(--progress); }
}

.skill-progress-bar {
    width: var(--progress);
    animation: fillProgress 1.5s ease-out;
}

.skill-item {
    overflow: hidden;
    transform: translateZ(0); /* Hardware acceleration */
}




.media-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.gallery-item {
    flex: 1;
    min-width: 150px;
    max-width: 250px;
    position: relative;
}

.gallery-item img {
    border-radius: var(--border-radius-md);
    width: 100%;
    object-fit: cover;
    aspect-ratio: 16/9;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background-color: rgba(12, 12, 15, 0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
}

.lightbox-video:hover .play-button {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
}

.news-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.news-item {
    padding: var(--spacing-sm);
    min-width: 150px;
    flex: 1;
    text-align: center;
    transition: all var(--transition-normal);
}

.news-item span {
    display: block;
    font-size: 0.8rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.news-item h6 {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== PORTFOLIO SECTION ===== */
.portfolio-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.portfolio-filter {
    background-color: transparent;
    border: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.portfolio-filter:hover, 
.portfolio-filter.active {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.portfolio-card {
    height: 100%;
    overflow: hidden;
}

.portfolio-image {
    margin: -1.5rem -1.5rem 1.5rem;
    overflow: hidden;
}

.portfolio-image img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

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

.portfolio-content {
    text-align: center;
}

.portfolio-content h3 {
    margin-bottom: var(--spacing-xs);
}

.portfolio-content p {
    margin-bottom: var(--spacing-md);
}

/* ===== SKILLS SECTION ===== */
.skills-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.skills-category {
    margin-bottom: var(--spacing-md);
}

.skills-category h3 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-accent);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.skill-item {
    height: 100%;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.skill-info h4 {
    margin-bottom: 0;
}

.skill-progress {
    height: 6px;
    background-color: var(--color-bg-primary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.skill-progress-bar {
    height: 100%;
    background: var(--gradient-heading-4color);
    border-radius: 3px;
    width: 0;
    transition: width 1.5s ease-out;
}

/* ===== EDUCATION SECTION ===== */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.education-column h3 {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.education-card, .certification-card {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    align-items: flex-start;
}

.education-icon, .certification-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(0, 254, 254, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.5rem;
}

.education-content, .certification-content {
    flex: 1;
}

.university-link, .credly-link {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-xs);
    font-size: 0.9rem;
}

.university-link i, .credly-link i {
    margin-right: 5px;
}

.credly-link {
    color: var(--color-grad-2);
}

.credly-link:hover {
    color: var(--color-grad-1);
}

/* ===== CONTACT SECTION ===== */
.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

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

.contact-method {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.contact-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: rgba(0, 254, 254, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: 1.2rem;
}

.contact-details h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.2rem;
}

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

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-bg-card-alt);
    border: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-3px);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--color-bg-card-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 254, 254, 0.2);
}

/* Form status styling */
.form-status {
    margin: 15px 0;
    font-size: 0.9rem;
}

.form-status .sending {
    color: var(--color-text-muted);
}

.form-status .success {
    color: #34D399; /* Màu xanh lá cho thành công */
}

.form-status .error {
    color: var(--color-accent); /* Màu đỏ cam cho lỗi */
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--color-bg-card);
    border-top: 1px solid var(--color-border-light);
    padding: var(--spacing-lg) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

.footer-nav a {
    color: var(--color-text-secondary);
}

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

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    width: 80%;
    max-width: 900px;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    font-size: 2rem;
    color: var(--color-text-primary);
    cursor: pointer;
    z-index: 2001;
}

.video-container {
    position: relative;
    padding-top: 56.25%;
    width: 100%;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.image-container {
    text-align: center;
}

.image-container img {
    max-height: 80vh;
    max-width: 100%;
    margin: 0 auto;
}

/* ===== BACK TO TOP ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    background-color: var(--color-text-primary);
}

/* ===== ANIMATIONS ===== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.staggered-animation-grid > * {
    opacity: 0;
    transform: translateY(30px);
}

.staggered-animation-grid > *.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Scroll Highlight Text Animation */
.scroll-highlight-text {
    color: var(--color-text-secondary);
    font-weight: 400;
    transition: color 0.5s ease, font-weight 0.5s ease;
}

.scroll-highlight-text.is-highlighted {
    color: var(--color-text-primary);
    font-weight: 500;
}

/* Thêm vào phần animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@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 zoomIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

.animate-fade-down {
    animation: fadeInDown 0.6s ease-out forwards;
}

.animate-fade-left {
    animation: fadeInLeft 0.6s ease-out forwards;
}

.animate-fade-right {
    animation: fadeInRight 0.6s ease-out forwards;
}

.animate-zoom-in {
    animation: zoomIn 0.6s ease-out forwards;
}

/* Delay animations */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }



/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 992px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .hero-image {
        max-width: 300px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .about-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
    
    .timeline-marker {
        left: 12px;
    }
    
    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 70%;
        height: calc(100vh - 70px);
        background-color: var(--color-bg-card);
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: right var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-link {
        margin: var(--spacing-xs) 0;
    }
    
    .portfolio-filters {
        overflow-x: auto;
        padding-bottom: var(--spacing-xs);
        justify-content: flex-start;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
       .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .footer-nav {
        justify-content: center;
    }
    
    .education-card, .certification-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

@media (max-width: 576px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
    
    .media-gallery {
        flex-direction: column;
        align-items: center;
    }
    
    .gallery-item {
        max-width: 100%;
    }
    
    .modal-content {
        width: 95%;
    }
    
    .portfolio-item {
        max-width: 100%;
    }
}

/* Floating Social Icons */
.floating-socials {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 99;
}

.floating-socials .social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
}

.floating-socials .social-link:hover {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 5px 15px rgba(255, 74, 54, 0.25);
}

/* Page Navigation Dots */
.page-nav-dots {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 99;
}

.nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-normal);
    position: relative;
}

.nav-dot:hover, .nav-dot.active {
    background-color: var(--color-accent);
    transform: scale(1.2);
}

.nav-dot:hover::after, .nav-dot.active::after {
    content: attr(data-section);
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    padding: 5px 10px;
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-sm);
    white-space: nowrap;
    font-size: 12px;
    color: var(--color-text-primary);
    opacity: 0.9;
}

/* Quick Contact Buttons */
.quick-contact {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 99;
}

.quick-contact-item {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-normal);
    font-size: 1.2rem;
}

.quick-contact-item:hover {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255, 74, 54, 0.25);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 100px;
    right: 20px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    z-index: 99;
}

.theme-toggle:hover {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: rotate(180deg);
}

/* Tooltip style */
.tooltip {
    position: relative;
}

.tooltip .tooltip-text {
    position: absolute;
    right: 60px;
    top: 50%;
    transform: translateY(-50%) scale(0.7);
    background-color: var(--color-bg-card);
    color: var(--color-text-primary);
    white-space: nowrap;
    padding: 5px 10px;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    pointer-events: none;
    opacity: 0;
    transition: all var(--transition-normal);
}

.tooltip:hover .tooltip-text {
    transform: translateY(-50%) scale(1);
    opacity: 1;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .floating-socials, .page-nav-dots {
        display: none;
    }
    
    .quick-contact {
        flex-direction: row;
        bottom: 20px;
        right: 50%;
        transform: translateX(50%);
    }
    
    .theme-toggle {
        top: auto;
        bottom: 80px;
        right: 20px;
    }
    
    .tooltip .tooltip-text {
        top: -30px;
        right: auto;
        transform: translateX(-50%) scale(0.7);
    }
    
    .tooltip:hover .tooltip-text {
        transform: translateX(-50%) scale(1);
    }
}

/* Glassmorphism effect for floating elements */
@supports (backdrop-filter: blur(10px)) {
    .floating-socials .social-link, 
    .nav-dot, 
    .quick-contact-item, 
    .theme-toggle {
        background-color: rgba(19, 20, 25, 0.7);
        backdrop-filter: blur(10px);
    }
}


/* Typewriter Effect */
.typewriter {
    overflow: hidden;
    border-right: 3px solid var(--color-accent);
    white-space: nowrap;
    margin: 0 auto var(--spacing-md);
    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(--color-accent); }
}