/* ===========================================================
     1. BIẾN MÀU & BIẾN CHUNG 
     =========================================================== */
:root {
    --color-primary: #0b0e17;
    --color-secondary: #31b6c8;
    --color-dark: #05060b;
    --color-gray: #9099aa;
    --color-white: #ffffff;

    --color-surface: #11141f;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-soft: #e7e9ee;

    --font-base: "Inter", system-ui, -apple-system, sans-serif;

    --radius-base: 0;
    --shadow-base: 0 20px 50px -20px rgba(0, 0, 0, 0.45);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}
a {
    text-decoration: none;
}
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    color: var(--color-dark);
    background: var(--color-white);
}

/* ===========================================================
     2. CLASS TYPOGRAPHY DÙNG CHUNG
     =========================================================== */
.heading {
    font-family: var(--font-base);
    font-weight: 800;
    font-size: clamp(2rem, 3.4vw, 3.2rem);
    line-height: 1.12;
    letter-spacing: -0.02em;
    color: var(--color-dark);
    margin-bottom: 1rem;
}

.heading-on-dark {
    color: var(--color-white);
}

.sub-heading {
    font-family: var(--font-base);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-size: 0.78rem;
    color: var(--color-primary);
    margin-bottom: 0.7rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.sub-heading::before {
    content: "";
    width: 18px;
    height: 2px;
    background: var(--color-secondary);
    display: inline-block;
}

.sub-heading-on-dark {
    color: var(--color-secondary);
}

.title {
    font-family: var(--font-base);
    font-weight: 700;
    font-size: 1.15rem;
    line-height: 1.4;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.title-on-dark {
    color: var(--color-white);
}

.text-base {
    font-family: var(--font-base);
    font-weight: 400;
    font-size: 0.96rem;
    line-height: 1.7;
    color: var(--color-gray);
}

/* ===========================================================
     3. LAYOUT CHUNG
     =========================================================== */
.section-padding {
    padding: 6rem 0;
}

@media (max-width: 767px) {
    .section-padding {
        padding: 3.4rem 0;
    }
}

.bg-surface-base {
    background: var(--color-surface);
}

.bg-dark-base {
    background: var(--color-primary);
}

.button-primary {
    background: var(--color-secondary);
    color: var(--color-dark);
    border: 1px solid var(--color-secondary);
    border-radius: 50px;
    padding: 0.85rem 1.8rem;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
}

.button-primary:hover {
    background: var(--color-dark);
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.button-outline {
    background: transparent;
    color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.85rem 1.8rem;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    transition: var(--transition-base);
}

.button-outline:hover {
    background: var(--color-white);
    color: var(--color-dark);
    border-color: var(--color-white);
}

/* ===========================================================
     4. NGÔN NGỮ — ẩn / hiện theo lang hiện tại
     =========================================================== */
[data-lang="vi"] {
    display: none;
}

html[data-active-lang="vi"] [data-lang="vi"] {
    display: inline;
}

html[data-active-lang="vi"] [data-lang="en"] {
    display: none;
}

html[data-active-lang="vi"] [data-lang-block="vi"] {
    display: block;
}

html[data-active-lang="vi"] [data-lang-block="en"] {
    display: none;
}

[data-lang-block="vi"] {
    display: none;
}

.language-switch {
    display: flex;
    align-items: center;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.2rem;
    gap: 0.2rem;
}

.language-switch-button {
    background: transparent;
    border: none;
    color: var(--color-dark);
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    transition: var(--transition-base);
}

.language-switch-button.active {
    background: var(--color-secondary);
    color: var(--color-dark);
}

.site-header .language-switch {
    border-color: var(--color-border-soft);
}

.site-header .language-switch-button {
    color: var(--color-dark);
}

/* ===========================================================
     5. HEADER / NAVBAR
     =========================================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border-soft);
}

.site-logo {
    font-weight: 900;
    font-size: 1.35rem;
    color: var(--color-dark);
    letter-spacing: -0.02em;
}

.site-logo span {
    color: var(--color-secondary);
    -webkit-text-stroke: 1px var(--color-dark);
}

.nav-link-base {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-dark) !important;
    padding: 0.5rem 1rem !important;
    transition: var(--transition-base);
}

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

/* ===========================================================
     6. HERO / SWIPER 
     =========================================================== */
.hero-swiper {
    height: 100vh;
    background: var(--color-dark);
}

@media (max-width: 767px) {
    .hero-swiper {
        height: 520px;
    }
}

.hero-swiper .swiper-slide {
    opacity: 0;
    transition: opacity 1.1s ease !important;
}

.hero-swiper .swiper-slide-active {
    opacity: 1;
}

.hero-slide {
    position: relative;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-slide-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transform: scale(1.08);
    transition: transform 7s cubic-bezier(0.2, 0.6, 0.2, 1);
}

.hero-swiper .swiper-slide-active .hero-slide-bg {
    transform: scale(1);
}

.hero-slide::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
            rgba(5, 6, 11, 0.92) 8%,
            rgba(5, 6, 11, 0.55) 55%,
            rgba(5, 6, 11, 0.15) 100%);
    z-index: 1;
}

.hero-slide-content {
    position: relative;
    z-index: 2;
    color: var(--color-white);
    max-width: 640px;
    opacity: 0;
    transform: translateY(18px);
    transition:
        opacity 0.8s ease 0.35s,
        transform 0.8s ease 0.35s;
}

.hero-swiper .swiper-slide-active .hero-slide-content {
    opacity: 1;
    transform: translateY(0);
}

.hero-slide-content .heading {
    color: var(--color-white);
}

.hero-slide-content .text-base {
    color: #c7ccd8;
}

.hero-swiper .swiper-pagination-bullet {
    width: 34px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.35);
    opacity: 1;
    transition: var(--transition-base);
}

.hero-swiper .swiper-pagination-bullet-active {
    background: var(--color-secondary);
}

.hero-swiper .swiper-button-next,
.hero-swiper .swiper-button-prev {
    color: var(--color-white);
    width: 46px;
    height: 46px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    backdrop-filter: blur(6px);
    transition: var(--transition-base);
}

.hero-swiper .swiper-button-next:hover,
.hero-swiper .swiper-button-prev:hover {
    background: var(--color-secondary);
    color: var(--color-dark);
}

.hero-swiper .swiper-button-next:after,
.hero-swiper .swiper-button-prev:after {
    font-size: 1.1rem;
}

/* ===========================================================
     7. TRUSTED-BY LOGO MARQUEE
     =========================================================== */
.logo-marquee-wrap {
    overflow: hidden;
    position: relative;
}

.logo-marquee-track {
    display: flex;
    align-items: center;
    gap: 3.2rem;
    width: max-content;
    animation: logoMarqueeScroll 28s linear infinite;
}

.logo-marquee-track img {
    height: 28px;
    width: auto;
    filter: grayscale(1);
    opacity: 0.55;
}

@keyframes logoMarqueeScroll {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(-50%);
    }
}

/* ===========================================================
     8. ABOUT US
     =========================================================== */
.about-image-wrap {
    position: relative;
    border-radius: var(--radius-base);
    overflow: hidden;
}

.about-image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-stat-card {
    position: absolute;
    bottom: -24px;
    right: -24px;
    background: var(--color-dark);
    border-radius: var(--radius-base);
    box-shadow: var(--shadow-base);
    padding: 1.2rem 1.6rem;
    text-align: center;
}

@media (max-width: 991px) {
    .about-stat-card {
        right: 12px;
        bottom: -18px;
    }
}

.about-stat-number {
    font-weight: 800;
    font-size: 1.8rem;
    color: var(--color-secondary);
}

.about-stat-card .text-base {
    color: #c7ccd8;
    margin-bottom: 0;
}

.about-feature-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border-soft);
}

.about-feature-item:last-child {
    border-bottom: none;
}

.about-feature-icon {
    width: 46px;
    height: 46px;
    flex-shrink: 0;
    border-radius: 50%;
    background: var(--color-dark);
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
}

/* ===========================================================
     9. PROJECT FILTER
     =========================================================== */
.project-filter-bar {
    /* background: var(--color-white);
    border: 1px solid var(--color-border-soft);
    border-radius: var(--radius-base);
    padding: 1.2rem;
    box-shadow: var(--shadow-base); */
}

.filter-button {
    border: 1px solid var(--color-border-soft);
    background: var(--color-white);
    color: var(--color-gray);
    border-radius: 50px;
    padding: 0.55rem 1.3rem;
    font-weight: 600;
    font-size: 0.86rem;
    transition: var(--transition-base);
}

.filter-button:hover {
    border-color: var(--color-dark);
    color: var(--color-dark);
}

.filter-button.active {
    background: var(--color-dark);
    border-color: var(--color-dark);
    color: var(--color-secondary);
}

.filter-select-base {
    border: 1px solid var(--color-border-soft);
    border-radius: 50px;
    padding: 0.6rem 1.1rem;
    font-size: 0.86rem;
    color: var(--color-dark);
    font-weight: 600;
}

.filter-select-base:focus {
    box-shadow: 0 0 0 0.2rem rgba(214, 255, 63, 0.25);
    border-color: var(--color-secondary);
}

/* ===========================================================
     10. PROJECT CARD — TOGGLE ẢNH / VIDEO + BẰNG CHIỀU CAO
     =========================================================== */
.project-card {
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--color-white);
    //: 1px solid var(--color-border-soft);
    border-radius: var(--radius-base);
    overflow: hidden;
    transition: var(--transition-base);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-base);
    border-color: transparent;
}

.project-card-media {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--color-dark);
}

.project-card-media-layer {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.45s ease;
}

.project-card-media-layer.active-media {
    opacity: 1;
    visibility: visible;
}

.project-card-media-layer img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-card-media-layer.active-media img {
    transform: scale(1.06);
}

.project-card-media-layer iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

/* -------- custom video wrapper: ẩn UI mặc định, dùng nút custom -------- */
.custom-video-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--color-dark);
}

.custom-video-wrapper iframe {
    width: 100%;
    height: 100%;
    border: 0;
    pointer-events: none;
    /* chặn click vào iframe gốc, chỉ dùng nút custom */
}

.custom-video-controls {
    position: absolute;
    left: 12px;
    bottom: 12px;
    z-index: 6;
    display: flex;
    gap: 0.5rem;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.custom-video-wrapper:hover .custom-video-controls,
.custom-video-wrapper.controls-visible .custom-video-controls {
    opacity: 1;
}

.video-control-button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: rgba(5, 6, 11, 0.6);
    color: var(--color-white);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    line-height: 1;
    transition: var(--transition-base);
}

.video-control-button:hover {
    background: var(--color-secondary);
    color: var(--color-dark);
}

.custom-video-wrapper:fullscreen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-dark);
}

.custom-video-wrapper:fullscreen iframe {
    width: 100%;
    height: 100%;
}

.project-card-badge {
    position: absolute;
    top: 14px;
    left: 14px;
    background: var(--color-white);
    color: var(--color-dark);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.3rem 0.7rem;
    border-radius: 50px;
    z-index: 3;
}

.project-card-media-toggle {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 4;
    display: flex;
    background: rgba(5, 6, 11, 0.55);
    backdrop-filter: blur(6px);
    border-radius: 50px;
    padding: 0.22rem;
    gap: 0.2rem;
}

.project-card-media-toggle-button {
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    transition: var(--transition-base);
}

.project-card-media-toggle-button.active-toggle {
    background: var(--color-secondary);
    color: var(--color-dark);
}

.project-card-body {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    padding: 1.3rem;
}

.project-card-client {
    font-size: 0.76rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.4rem;
}

.project-card-description {
    flex: 1 1 auto;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 1rem;
}

.project-card-link {
    font-weight: 700;
    font-size: 0.86rem;
    color: var(--color-dark);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: auto;
}

.project-card-link:hover {
    color: var(--color-primary);
    gap: 0.6rem;
}

/* ===========================================================
     11. VIDEO SHOWCASE SECTION — DẠNG SLIDER BANNER TRONG CONTAINER
     =========================================================== */
.video-showcase-swiper {
    border-radius: var(--radius-base);
    overflow: hidden;
    height: 680px;
}

@media (max-width: 767px) {
    .video-showcase-swiper {
        height: 340px;
    }
}

.video-showcase-swiper .swiper-slide {
    opacity: 0;
    transition: opacity 1.1s ease !important;
}

.video-showcase-swiper .swiper-slide-active {
    opacity: 1;
}

.video-showcase-card {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--color-dark);
}

.video-showcase-card .custom-video-wrapper {
    width: 100%;
    height: 100%;
}

.video-showcase-overlay {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    padding: 2rem;
    background: linear-gradient(0deg,
            rgba(5, 6, 11, 0.92) 15%,
            rgba(5, 6, 11, 0) 100%);
    pointer-events: none;
}

.video-showcase-overlay .title {
    color: var(--color-white);
    margin-bottom: 0.3rem;
    font-size: 1.4rem;
}

.video-showcase-overlay .text-base {
    color: #c7ccd8;
    margin-bottom: 0;
    max-width: 480px;
}

.video-showcase-swiper .swiper-pagination-bullet {
    width: 28px;
    height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.35);
    opacity: 1;
    transition: var(--transition-base);
}

.video-showcase-swiper .swiper-pagination-bullet-active {
    background: var(--color-secondary);
}

.video-showcase-swiper .swiper-button-next,
.video-showcase-swiper .swiper-button-prev {
    color: var(--color-white);
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    backdrop-filter: blur(6px);
    transition: var(--transition-base);
}

.video-showcase-swiper .swiper-button-next:hover,
.video-showcase-swiper .swiper-button-prev:hover {
    background: var(--color-secondary);
    color: var(--color-dark);
}

.video-showcase-swiper .swiper-button-next:after,
.video-showcase-swiper .swiper-button-prev:after {
    font-size: 1rem;
}

/* ===========================================================
     12. CONTACT US
     =========================================================== */
.contact-info-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1.4rem;
}

.contact-info-icon {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 700;
}

.contact-form-card {
    background: var(--color-white);
    border-radius: var(--radius-base);
    padding: 2rem;
    box-shadow: var(--shadow-base);
}

.form-control-base {
    border: 1px solid var(--color-border-soft);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-size: 0.92rem;
}

.form-control-base:focus {
    box-shadow: 0 0 0 0.2rem rgba(214, 255, 63, 0.25);
    border-color: var(--color-secondary);
}

.form-label-base {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-dark);
    margin-bottom: 0.4rem;
}

/* ===========================================================
     13. FOOTER
     =========================================================== */
.site-footer {
    background: var(--color-dark);
    color: #9099aa;
}

.site-footer .title {
    color: var(--color-white);
}

.footer-link {
    color: #9099aa;
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 0.6rem;
    transition: var(--transition-base);
}

.footer-link:hover {
    color: var(--color-secondary);
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.08);
}

.social-icon-base {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition-base);
}

.social-icon-base:hover {
    background: var(--color-secondary);
    color: var(--color-dark);
}