/* -------------------------------------------------------------
   SYSTEM VARIABLES & DESIGN TOKENS
   ------------------------------------------------------------- */
:root {
    /* Color Palette - Premium Dark & Warm Bronze */
    --bg-primary: #0a0a0b;
    --bg-secondary: #121215;
    --bg-tertiary: #19191d;
    --accent: #c5a880;          /* Warm architectural champagne bronze */
    --accent-hover: #b59870;
    --accent-glow: rgba(197, 168, 128, 0.2);
    --text-primary: #ffffff;
    --text-secondary: #a0a0ab;   /* Soft slate gray */
    --text-muted: #636370;
    
    /* Layout Elements */
    --border-color: rgba(197, 168, 128, 0.12);
    --border-color-light: rgba(255, 255, 255, 0.05);
    --max-width: 1400px;
    
    /* Fonts */
    --font-heading: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Transitions */
    --transition-smooth: all 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    --transition-bounce: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

ul {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    background: none;
    border: none;
    outline: none;
    color: inherit;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* -------------------------------------------------------------
   REUSABLE UTILITIES
   ------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 4rem;
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
}

.grid {
    display: grid;
    gap: 3rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 992px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

.italic-serif {
    font-family: var(--font-heading);
    font-style: italic;
    font-weight: 400;
}

/* Section Titles */
.section-title-wrapper {
    margin-bottom: 3.5rem;
}

.section-title-wrapper.text-center {
    text-align: center;
}

.section-tag {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    color: var(--accent);
    text-transform: uppercase;
    display: block;
    margin-bottom: 0.75rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 300;
    line-height: 1.25;
    letter-spacing: -0.01em;
}

@media (max-width: 768px) {
    .section-title {
        font-size: 2.25rem;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.25rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border-radius: 0;
    transition: var(--transition-smooth);
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: var(--text-primary);
}

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

.btn-outline:hover {
    border-color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-block {
    width: 100%;
}

/* -------------------------------------------------------------
   MAIN HEADER / NAVIGATION
   ------------------------------------------------------------- */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: transparent;
    border-bottom: 1px solid transparent;
    transition: var(--transition-smooth);
    padding: 1.5rem 0;
}

.main-header.scrolled {
    background-color: rgba(10, 10, 11, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-color-light);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    flex-direction: column;
    max-width: 80%;
}

.logo-title {
    font-family: var(--font-heading);
    font-size: 2.1rem; /* Chữ to lên một chút */
    font-weight: 400;
    letter-spacing: 0.1em;
    line-height: 1.1;
    transition: var(--transition-smooth);
}

.logo-sub {
    font-size: 0.92rem; /* Tăng kích thước đáng kể để cân đối với tên chính */
    font-weight: 600;
    letter-spacing: 0.1em; /* Giảm nhẹ khoảng cách để ôm gọn chữ lớn */
    color: var(--accent);
    margin-top: 0.5rem;
    line-height: 1.3;
    transition: var(--transition-smooth);
    text-transform: uppercase;
}

.nav-menu ul {
    display: flex;
    gap: 3rem;
}

.nav-link {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent);
    transition: var(--transition-smooth);
}

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

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 16px;
    cursor: pointer;
}

.nav-toggle .bar {
    width: 100%;
    height: 1.5px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

@media (max-width: 768px) {
    .logo {
        max-width: 70%;
    }
    .logo-title {
        font-size: 1.45rem; /* Tối ưu kích thước trên di động */
        letter-spacing: 0.05em;
    }
    .logo-sub {
        font-size: 0.6rem; /* Tăng kích thước trên di động để cân xứng */
        letter-spacing: 0.05em;
        line-height: 1.3;
        margin-top: 0.3rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background-color: var(--bg-secondary);
        z-index: 999;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: var(--transition-smooth);
        border-left: 1px solid var(--border-color);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    .nav-menu ul {
        flex-direction: column;
        align-items: center;
        gap: 2.5rem;
    }
    
    .nav-link {
        font-size: 1.1rem;
    }

    /* Cross animation for active toggle */
    .nav-toggle.open .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.open .bar:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.open .bar:nth-child(3) {
        transform: translateY(-7.5px) rotate(-45deg);
    }
}

/* -------------------------------------------------------------
   HERO SECTION
   ------------------------------------------------------------- */
.hero-section {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transform: scale(1.05);
    z-index: 1;
    transition: transform 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-container {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-content {
    max-width: 60%;
}

.hero-subtitle {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.35em;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4.8rem;
    font-weight: 300;
    line-height: 1.15;
    margin-bottom: 2rem;
    letter-spacing: -0.01em;
}

.hero-description {
    font-size: 1.08rem; /* Tăng cỡ chữ mô tả chính */
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .hero-content {
        max-width: 90%;
    }
    .hero-title {
        font-size: 3.5rem;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2.8rem;
    }
    .hero-actions {
        flex-direction: column;
        gap: 1rem;
    }
    .btn {
        width: 100%;
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 4rem;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
}

.scroll-text {
    font-size: 0.65rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.scroll-line {
    width: 1px;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 40%;
    background-color: var(--accent);
    animation: scroll-reveal-anim 2s infinite cubic-bezier(0.25, 1, 0.5, 1);
}

@keyframes scroll-reveal-anim {
    0% { transform: translateY(-100%); }
    80% { transform: translateY(250%); }
    100% { transform: translateY(250%); }
}

@media (max-width: 768px) {
    .scroll-indicator {
        left: 1.5rem;
        bottom: 1.5rem;
    }
}

/* -------------------------------------------------------------
   ABOUT SECTION
   ------------------------------------------------------------- */
.about-section {
    padding: 10rem 0;
    background-color: var(--bg-primary);
}

.about-text-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.08rem; /* Tăng cỡ chữ mô tả giới thiệu */
}

.about-p.highlight {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--accent);
    line-height: 1.5;
    padding-left: 1.5rem;
    border-left: 2px solid var(--accent);
    margin: 2rem 0;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 300;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* About Visual Card */
.about-visual-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image-card {
    position: relative;
    width: 90%;
    aspect-ratio: 4/5;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.about-image-card .img-reveal {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    transition: var(--transition-smooth);
}

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

.about-experience-badge {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.badge-title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.badge-desc {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-top: 0.3rem;
}

@media (max-width: 992px) {
    .about-section {
        padding: 6rem 0;
    }
    .about-image-card {
        width: 100%;
        margin-top: 2rem;
    }
}

/* -------------------------------------------------------------
   PROJECTS SECTION (PORTFOLIO)
   ------------------------------------------------------------- */
.projects-section {
    padding: 8rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color-light);
    border-bottom: 1px solid var(--border-color-light);
}

.section-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 4rem;
}

.filter-wrapper {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.6rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 1px solid var(--border-color-light);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.filter-btn:hover, .filter-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background-color: rgba(197, 168, 128, 0.05);
}

@media (max-width: 992px) {
    .section-header-flex {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
    }
}

/* Projects Grid - Asymmetrical Layout */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3.5rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    cursor: pointer;
    opacity: 1;
    transform: translateY(0);
    transition: var(--transition-smooth), transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.project-card.hide {
    display: none;
}

.project-img-container {
    position: relative;
    aspect-ratio: 3/2;
    overflow: hidden;
    border: 1px solid var(--border-color-light);
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 10, 11, 0.7);
    opacity: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2rem;
    transition: var(--transition-smooth);
    z-index: 2;
}

.project-category-tag {
    align-self: flex-start;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    color: var(--accent);
    text-transform: uppercase;
}

.project-view-btn {
    align-self: flex-end;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 0.3rem;
}

.project-view-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background-color: var(--accent);
    transition: var(--transition-smooth);
}

/* Card Hover Animations */
.project-card:hover .project-img {
    transform: scale(1.08);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-card:hover .project-view-btn::after {
    width: 100%;
}

.project-info {
    padding: 0.5rem 0;
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    transition: var(--transition-smooth);
}

.project-card:hover .project-title {
    color: var(--accent);
}

.project-meta {
    font-size: 0.92rem; /* Tăng cỡ chữ mô tả dự án */
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .project-overlay {
        opacity: 1;
        background-color: rgba(10, 10, 11, 0.3);
        justify-content: flex-end;
        padding: 1rem;
    }

    .project-category-tag {
        display: none;
    }
}

/* -------------------------------------------------------------
   SERVICES SECTION
   ------------------------------------------------------------- */
.services-section {
    padding: 10rem 0;
    background-color: var(--bg-primary);
}

.service-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color-light);
    padding: 3.5rem 2.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-smooth);
}

.service-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
}

.service-icon {
    width: 32px;
    height: 32px;
    color: var(--accent);
    stroke-width: 1.25;
}

.service-num {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: var(--text-muted);
    font-weight: 300;
}

.service-card:hover .service-num {
    color: var(--accent);
}

.service-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 1.2rem;
}

.service-desc {
    font-size: 0.98rem; /* Tăng cỡ chữ mô tả dịch vụ */
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 992px) {
    .services-section {
        padding: 6rem 0;
    }
}

/* -------------------------------------------------------------
   CONTACT SECTION
   ------------------------------------------------------------- */
.contact-section {
    padding: 8rem 0;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color-light);
}

.contact-info-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-p {
    color: var(--text-secondary);
    font-size: 1.08rem; /* Tăng cỡ chữ mô tả liên hệ */
    margin-bottom: 3.5rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    color: var(--accent);
    line-height: 1;
}

.contact-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.3rem;
}

.contact-value {
    font-size: 1rem;
    color: var(--text-primary);
}

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

/* Contact Form Grid & Card Styling */
.contact-form-wrapper {
    position: relative;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color-light);
    padding: 3rem;
}

.form-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.75rem;
}

.form-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.6rem;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color-light);
    padding: 1rem 1.2rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: var(--transition-smooth);
    border-radius: 0;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(197, 168, 128, 0.08);
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23c5a880'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.2rem center;
    background-size: 1rem;
    padding-right: 3rem;
}

.form-textarea {
    resize: none;
}

/* Success State Overlay */
.form-success-message {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-tertiary);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.form-success-message.show {
    opacity: 1;
    pointer-events: auto;
}

.success-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--accent-glow);
    border: 1.5px solid var(--accent);
    color: var(--accent);
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.form-success-message h3 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 400;
    margin-bottom: 1rem;
}

.form-success-message p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 80%;
}

@media (max-width: 768px) {
    .contact-form-wrapper {
        padding: 2rem 1.5rem;
    }
}

/* -------------------------------------------------------------
   MAIN FOOTER
   ------------------------------------------------------------- */
.main-footer {
    background-color: var(--bg-primary);
    padding: 6rem 0 0 0;
    border-top: 1px solid var(--border-color-light);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    padding-bottom: 5rem;
}

.footer-brand {
    max-width: 85%;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.98rem; /* Tăng cỡ chữ mô tả chân trang */
    margin-top: 1.5rem;
}

.footer-title {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    text-transform: uppercase;
    margin-bottom: 2rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

@media (max-width: 992px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-brand {
        max-width: 100%;
    }
}

.footer-bottom {
    border-top: 1px solid var(--border-color-light);
    padding: 2.5rem 0;
}

.footer-bottom-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    font-size: 0.88rem; /* Tăng cỡ chữ bản quyền */
    color: var(--text-muted);
}

.social-icons {
    display: flex;
    gap: 1.5rem;
}

.social-icon-link {
    font-size: 0.88rem; /* Tăng cỡ chữ mạng xã hội */
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

.social-icon-link:hover {
    color: var(--accent);
}

@media (max-width: 768px) {
    .footer-bottom-flex {
        flex-direction: column-reverse;
        gap: 1.5rem;
        text-align: center;
    }
}

/* -------------------------------------------------------------
   FLOATING ACTION BUTTONS (ZALO & PHONE CALL)
   ------------------------------------------------------------- */
.floating-contact {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.floating-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    position: relative;
    cursor: pointer;
    transition: var(--transition-bounce);
}

.floating-btn:hover {
    transform: scale(1.08) translateY(-3px);
}

.floating-pulse {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    top: 0;
    left: 0;
    z-index: -1;
    opacity: 0.8;
}

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

.phone-btn .floating-pulse {
    box-shadow: 0 0 0 0 rgba(197, 168, 128, 0.6);
    animation: pulse-phone 2.5s infinite cubic-bezier(0.66, 0, 0, 1);
}

.zalo-btn {
    background-color: #0068ff; /* Brand Zalo Blue */
    color: #ffffff;
}

.zalo-btn .floating-pulse {
    box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.6);
    animation: pulse-zalo 2.5s infinite cubic-bezier(0.66, 0, 0, 1);
}

@keyframes pulse-phone {
    to { box-shadow: 0 0 0 20px rgba(197, 168, 128, 0); }
}

@keyframes pulse-zalo {
    to { box-shadow: 0 0 0 20px rgba(0, 104, 255, 0); }
}

.floating-icon {
    width: 24px;
    height: 24px;
    position: relative;
    z-index: 2;
}

/* Hover Floating Label */
.floating-label {
    position: absolute;
    right: 75px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: 0.5rem 1rem;
    white-space: nowrap;
    border-radius: 4px;
    opacity: 0;
    pointer-events: none;
    transform: translateX(15px);
    transition: var(--transition-smooth);
}

.floating-btn:hover .floating-label {
    opacity: 1;
    transform: translateX(0);
}

@media (max-width: 768px) {
    .floating-contact {
        bottom: 1.5rem;
        right: 1.5rem;
        gap: 1rem;
    }
    
    .floating-btn {
        width: 50px;
        height: 50px;
    }

    .floating-icon {
        width: 20px;
        height: 20px;
    }
    
    .floating-label {
        display: none; /* Hide labels on mobile to avoid overlap */
    }
}

/* -------------------------------------------------------------
   LIGHTBOX MODAL FOR PORTFOLIO DETAILS
   ------------------------------------------------------------- */
.lightbox-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 10, 11, 0.98);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    padding: 4rem;
}

.lightbox-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 3rem;
    color: var(--text-secondary);
    font-size: 3rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    z-index: 2002;
    line-height: 1;
}

.lightbox-close:hover {
    color: var(--accent);
}

.lightbox-content {
    max-width: 1000px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    z-index: 2001;
    transform: scale(0.95);
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.lightbox-modal.open .lightbox-content {
    transform: scale(1);
}

.lightbox-img {
    width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border: 1px solid var(--border-color-light);
}

.lightbox-caption {
    text-align: left;
}

.lightbox-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.lightbox-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .lightbox-modal {
        padding: 1.5rem;
    }
    .lightbox-close {
        top: 1rem;
        right: 1.5rem;
        font-size: 2.5rem;
    }
    .lightbox-title {
        font-size: 1.6rem;
    }
}