:root {
    --zb: #2B4BA0;
    --zbd: #1A3278;
    --zbl: #E8EDF9;
    --zbm: rgba(43,75,160,.10);
    --zg: #3A6B35;
    --zgd: #2A5026;
    --zgl: #EAF2E9;
    --zgm: rgba(58,107,53,.10);
    --ink: #0D0D12;
    --inks: #2E2E3A;
    --muted: #717185;
    --mutedl: #A0A0B5;
    --border: #E8E8F0;
    --surface: #F7F7FB;
    --white: #FFFFFF;
    --green: #16A34A;
    --greenl: #DCFCE7;
    --greenb: #BBF7D0;
    --red: #DC2626;
    --redl: #FEF2F2;
    --gold: #F5A623;
    --goldl: #FEF6E7;
}

*,*::before,*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0
}

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

body {
    font-family: 'DM Sans',system-ui,sans-serif;
    background: var(--surface);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden
}

a {
    text-decoration: none;
    color: inherit
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none
}

input,textarea,select {
    font-family: inherit;
    box-sizing: border-box
}

body.lang-hi {
    font-family: 'Noto Sans Devanagari','DM Sans',sans-serif
}

::-webkit-scrollbar {
    width: 4px;
    height: 4px
}

::-webkit-scrollbar-track {
    background: transparent
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px
}

.hide-scroll {
    scrollbar-width: none
}

.hide-scroll::-webkit-scrollbar {
    display: none
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

@keyframes fadeIn {
    from {
        opacity: 0
    }

    to {
        opacity: 1
    }
}

@keyframes ticker {
    0% {
        transform: translateX(0)
    }

    100% {
        transform: translateX(-50%)
    }
}

@keyframes shimmer {
    0% {
        background-position: 200% 0
    }

    100% {
        background-position: -200% 0
    }
}

@keyframes pulse {
    0%,100% {
        opacity: 1;
        transform: scale(1)
    }

    50% {
        opacity: .5;
        transform: scale(.7)
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.fu {
    animation: fadeUp .45s ease both
}

.fi {
    animation: fadeIn .3s ease both
}

.skel {
    background: linear-gradient(90deg,#F0F0F5 25%,#F8F8FC 50%,#F0F0F5 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
    border-radius: 8px
}

#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    height: 3px;
    background: var(--zg);
    width: 0%;
    transition: width 80ms linear;
    border-radius: 0 2px 2px 0;
    pointer-events: none
}

#toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--ink);
    color: #fff;
    border-radius: 9999px;
    padding: 10px 22px;
    font-size: 13.5px;
    font-weight: 600;
    z-index: 9999;
    white-space: nowrap;
    box-shadow: 0 12px 40px rgba(15,43,91,.14);
    opacity: 0;
    transition: opacity .3s,transform .3s;
    pointer-events: none
}

#toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0)
}
/* ── LOGO / WORDMARK ── */
.logo {
    display: flex;
    align-items: center;
    gap: 0;
    cursor: pointer;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden
}

.logo-zink {
    background: var(--zb);
    font-family: 'Barlow Condensed',sans-serif;
    font-weight: 900;
    color: #fff;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center
}

.logo-pot {
    background: var(--zg);
    font-family: 'Barlow Condensed',sans-serif;
    font-weight: 900;
    color: #fff;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center
}

.logo-lg .logo-zink,.logo-lg .logo-pot {
    font-size: 28px;
    padding: 5px 6px 5px 10px
}

.logo-lg .logo-pot {
    padding: 5px 10px 5px 6px
}

.logo-md .logo-zink,.logo-md .logo-pot {
    font-size: 35px;
    padding: 4px 4px 4px 8px
}

.logo-md .logo-pot {
    padding: 4px 8px 4px 4px
}

.logo-sm .logo-zink,.logo-sm .logo-pot {
    font-size: 15px;
    padding: 3px 3px 3px 6px
}

.logo-sm .logo-pot {
    padding: 3px 6px 3px 3px
}

.logo-inv .logo-zink {
    background: rgba(255,255,255,.12)
}

/* ── SITE HEADER ── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 300;
    background: var(--white);
    border-bottom: 1.5px solid var(--border);
    box-shadow: 0 2px 20px rgba(43,75,160,.06)
}

.hdr-search {
    flex: 1;
    max-width: 500px;
    position: relative
}

.hdr-search input {
    width: 100%;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 9999px;
    padding: 8px 40px 8px 16px;
    font-size: 13.5px;
    color: var(--ink);
    outline: none
}

.hdr-search svg {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted)
}

.hdr-actions {
    display: flex;
    align-items: center;
    gap: 10px
}

.lang-toggle {
    display: flex;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: 9999px;
    overflow: hidden;
    flex-shrink: 0;
    position: relative;
    align-items: center;
    padding-top: 2px;
}

.lang-btn {
    font-size: 12px;
    font-weight: 700;
    padding: 5px 13px;
    cursor: pointer;
    color: var(--muted);
    background: transparent;
    border: none;
    transition: .15s
}

.lang-btn.active {
    background: var(--zb);
    color: #fff;
    border-radius: 9999px
}
div#google_translate_element{
    opacity: 0;
    position: absolute;
}
.admin-btn {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    cursor: pointer;
    transition: .15s
}

.admin-btn.active {
    background: var(--zb)
}

.nav-strip {
    display: flex;
    align-items: center;
    border-top: 1px solid var(--border);
    gap: 2px;
    overflow-x: auto;
    list-style: none;
    padding-left: 0px;
    margin-bottom: 0px;
}
.nav-strip .dropdown-menu{
    height: 60vh;
    overflow-y: auto;
}
.nav-strip .dropdown-toggle::after{
    font-family: 'remixicon';
    content: "\ea4e";
}
.nav-strip .dropdown-item{
    font-size: 14px;
}
.nav-strip .dropdown-item:focus, .nav-strip .dropdown-item:hover {
    color: var(--zbd);
    background-color: var(--zbl);
}
.nav-strip li .dropdown-menu{
    display: block;
    transition: 0.3s;
    visibility: hidden;
    opacity: 0;
}
.nav-strip li:hover .dropdown-menu{
    display: block;
    visibility: visible;
    opacity: 1;
}
.nav-link span:last-child{
    display: block;
}
.nav-link {
    font-size: 13px;
    font-weight: 500;
    padding: 10px 15px;
    color: var(--inks);
    border-bottom: 2.5px solid transparent;
    border-top: none;
    border-left: none;
    border-right: none;
    background: none;
    cursor: pointer;
    white-space: nowrap;
    transition: all .18s;
    display: flex;
    align-items: center;
    gap: 5px
}

.nav-link:hover {
    color: var(--zb)
}

.nav-link.active {
    color: var(--zb);
    border-bottom-color: var(--zb);
    font-weight: 700
}

.nav-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 300;
    background: var(--white);
    border-bottom: 1.5px solid var(--border);
    box-shadow: 0 2px 20px rgba(43, 75, 160, .06);
}
.header-top{
    padding: 10px 0px;
}
.hero-section{
    background: var(--zb);
    position: relative;
    overflow: hidden;
    padding: 60px 0px;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -80px;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .04);
    pointer-events: none;
}
.hero-section::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -40px;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .04);
    pointer-events: none;
}
.hero-section .container{
    z-index: 1;
    position: relative;
}
.hero-kicker {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,.10);
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 9999px;
    padding: 5px 14px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .6px;
    text-transform: uppercase;
    color: rgba(255,255,255,.75);
    margin-bottom: 18px
}

.pulse-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #E8593C;
    animation: pulse 1.6s ease-in-out infinite;
    display: inline-block
}

.hero-title {
    font-family: 'Barlow Condensed',sans-serif;
    font-size: clamp(36px,5.5vw,50px);
    font-weight: 700;
    color: var(--white);
    line-height: 1.05;
    letter-spacing: 1px;
    margin-bottom: 14px
}

.hero-title em {
    color: var(--zbd);
    font-style: italic
}

.hero-sub {
    font-size: 15.5px;
    color: var(--zbl);
    line-height: 1.65;
    margin-bottom: 32px;
    max-width: 460px
}

.hero-stats {
    display: flex;
    gap: 28px
}

.stat-num {
    font-size: 30px;
    color: var(--zbl);
    line-height: 1;
    font-weight: 700;
}

.stat-label {
    font-size: 14px;
    color: var(--zbl);
    margin-top: 3px;
    display: block;
}

.hot-col {
    display: flex;
    flex-direction: column;
    gap: 10px
}

.hot-card {
    background: rgba(255,255,255,.07);
    border: 1px solid rgba(255,255,255,.14);
    border-left: 3px solid var(--white);
    border-radius: 12px;
    padding: 14px;
    cursor: pointer;
    transition: .2s
}

.hot-card:hover {
    background: rgba(255,255,255,.13)
}

.hot-top {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 8px
}

.hot-title {
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    line-height: 1.4;
    margin-bottom: 10px
}

.hot-cta {
    width: 100%;
    background: var(--white);
    border: none;
    border-radius: 7px;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer
}

.hot-cta span {
    font-size: 11.5px;
    font-weight: 700;
    color: var(--zb);
    text-align: left
}

.hot-arr {
    color: rgba(255,255,255,.7);
    font-size: 13px
}
.hero-section .cat-badge{
    color: var(--white);
}

.site-footer {
    background: var(--zbd);
    color: rgba(255, 255, 255, .6);
    padding: 40px 28px 24px;
}
.site-footer h4{
    color: rgba(255, 255, 255, .6);
}
.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, .1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}
.footer-bottom-text {
    font-size: 12px;
    color: rgba(255, 255, 255, .3);
}
.partner-chip {
    background: rgba(255, 255, 255, .07);
    border: 1px solid rgba(255, 255, 255, .1);
    border-radius: 8px;
    padding: 4px 10px;
    font-size: 10.5px;
    font-weight: 600;
    color: rgba(255, 255, 255, .4);
}
.footer-brand-desc {
    font-size: 13.5px;
    color: rgba(255, 255, 255, .45);
    line-height: 1.65;
    margin: 12px 0 20px;
    max-width: 260px;
}
.footer-social {
    display: flex;
    gap: 8px;
}
.social-btn {
    width: 34px;
    height: 34px;
    background: rgba(255, 255, 255, .08);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    cursor: pointer;
    transition: .18s;
    border: none;
    color: rgba(255, 255, 255, .7);
}
.footer-link {
    display: block;
    font-size: 13px;
    color: rgba(255, 255, 255, .45);
    margin-bottom: 9px;
    cursor: pointer;
    transition: color .15s;
    text-decoration: none;
}
.category-list li a.active {
    color: #fff;
    background: var(--zb);
}
.category-list li a:hover {
    background: var(--zbl);
    color: var(--zb);
}
.category-list li a {
    display: flex;
    gap: 0px;
    align-items: center;
    transition: 0.3s;
    padding: 2px 5px;
    border-radius: 12px;
    margin-bottom: 5px;
    font-size: 14px;
    font-weight: 500;
}
.category-list {
    list-style: none;
    margin-top: 0px;
    line-height: 14px;
    padding: 20px;
    position: sticky;
    top: 144px;
    height: calc(100vh - 150px);
    overflow-y: auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: -2px 6px 6px #00000017;
}
.category-list li a img {
    width: 30px;
    height: 30px;
    object-fit: contain;
    background: none;
    padding: 7px;
    border-radius: 20px;
    transition: 0.3s;
    flex: none;
}

.category-list li a.active img{
    filter: invert(1);
    background:none;
}
.category-list li a:hover img {
    background: none;
    filter: invert(24%) sepia(88%) saturate(1282%) hue-rotate(206deg) brightness(92%) contrast(93%);
}
.basic-concepts {
    position: sticky;
    top: 144px;
    max-height: 40vh;
}
.basic-concepts .concepts-list{
    overflow-y: auto;
    height: calc(40vh - 40px);
}
@media (min-width: 1024px) {
    .container, .container-lg, .container-md, .container-sm, .container-xl, .container-xxl {
        max-width: 90%;
    }
}
.widget-title {
    margin-bottom: 10px;
    padding: 7px 0px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--mutedl);
    display: block;
}
section.layout {
    padding-top: 20px;
}
.widget .card-header{
    background: #fff;
}
.widget {
    border: 0px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: -2px 6px 6px #00000017;
}
.widget .widget-title {
    margin-bottom: 0px;
    font-size: 14px;
    font-weight: 500;
    padding: 0;
    text-transform: none;
}
.trend_no{
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 20px;
    font-weight: 900;
    color: var(--border);
    line-height: 1;
    flex-shrink: 0;
    width: 22px;
}
.trend_column .title{
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.35;
    display: block;
    margin-bottom: 3px;
}
.trend_column .meta {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 10.5px;
    color: var(--mutedl);
}
.trend_row {
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background .15s;
    padding: 10px 15px;
}
.trend_row:hover{
    background: var(--surface);
}
.news-card {
    padding: 15px;
    background: #fff;
    margin: 0px;
    margin-bottom: 20px;
    border-radius:  12px;
    border-bottom: 2px solid #1b458f;
    box-shadow: -2px 6px 6px #00000017;
    transition: 0.3s;
}
.news-content{
    margin-bottom: 20px;
}
.news-content a > img {
    width: 100%;
    object-fit: contain;
    display: block;
    height: 338px;
    background: #000;
    margin-bottom: 5px;
    border-radius: 12px;
}
.card-adv{
    overflow: visible;
}
.recent_title, .blog-content strong{
    line-height: 28px;
    font-weight: 500;
}
.zp-btn-style-2,
.call_service {
    background: var(--zb);
    display: flex;
    justify-content: space-between;
    color: #fff;
    width: 100%;
    text-align: left;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 20px;
    text-transform: capitalize;
}
.zp-btn-style-2 img,
.call_service img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: grayscale(7);
}
.zp-btn-style-2:hover,
.call_service:hover{
    color: #fff;
    background: var(--zbd);
}
#quiz-science .question-text {
    font-size: 16px;
    color: var(--zbd);
    font-weight: 600;
}

.news-card:hover {
    box-shadow: -2px 6px 6px #2b4aa034;
}
.row.news_container div:nth-child(even) .news-card:hover {
    box-shadow: -2px 6px 6px lab(43.97% -30.65 26.47 / 0.295);
    
}

.checkAnswer {
    text-align: left;
    font-size: 14px;
}
#quiz-science .checkAnswer{
    border-color: var(--zbd);
}
#quiz-science .checkAnswer:hover{
    background-color: var(--zbd);
}
.btn-primary,
.zp-btn-style-1{
    display: flex;
    gap: 5px;
    align-items: center;
    transition: 0.3s;
    padding: .565rem .75rem;
    border-radius: 8px;
    margin-bottom: 5px;
    font-size: 14px;
    font-weight: 500;
    background: var(--zb);
    color: #fff;
    min-width: 100px;
}
.btn-primary:hover,
.zp-btn-style-1:hover{
    color: #fff;
    background: var(--zbd);
}
.zp-btn-style-1:disabled{
    background: var(--muted);
}

.service-list img {
    width: 100%;
    height: 86px;
    object-fit: contain;
    background: #fff;
    padding: 7px;
    border-radius: 12px;
    border: 1px solid #eee;
    transition: 0.3s;
}
.service-list img:hover {
    box-shadow: rgba(0, 0, 0, 0.09) -2px 6px 6px;
}
.app-btns {
    display: flex;
    gap: 10px;
    align-items: center;
    min-width: 200px;
    background: var(--zbd);
}
.app-btns:hover{
    background: var(--ink);
}
.app-btns .ri{
    font-size: 40px;
}
.app-btns .sub-title {
    display: block;
    text-align: left;
}

.app-btns .sub-label {
    display: block;
    text-align: left;
    font-size: 18px;
    font-weight: 600;
}

.mobile-icon{
    max-width: 50%;
}
.social-media{
    text-align: center;
    gap: 20px;
}
.hero-social-media a{
    text-align: center;
    display: inline-block;
    padding: 7px 12px;
    text-decoration: none;
    opacity: 0.9;
    border-radius: 12px;
    font-size: 20px;
    min-width: 30px;
    box-shadow: 2px 2px 5px rgb(18 32 107);
    transition: transform 0.6s ease;
    color: var(--zbl);
}
.hero-social-media .facebook {
    background: #1877f2;
}
.hero-social-media .whatsapp{
    background: #1ec550;
}
.hero-social-media .whatsapp:hover {
    background: #0ea73c;
}
.hero-social-media .twitter{
    background: var(--ink);
    
}
.hero-social-media .twitter:hover{
    background: #000;
}
.hero-social-media .instagram{
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
}
.hero-social-media .instagram:hover{
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #bc1888 50%, #cc2366 75%, #bc1888 100%);
}
.hero-social-media .teligram{
    background: #1da1f2;
}
.hero-social-media .youtube{
    background: #ff0018;
}
.hero-social-media .youtube:hover{
    background: #da0218;
}
.hero-social-media .teligram:hover,
.hero-social-media .facebook:hover {
    background: #0c63d6;
}
.right-header{
    display: none;
}

@media(max-width: 1440px){
    .hero-title {
        font-size: clamp(36px, 5.5vw, 40px);
    }
    .category-list li a,
    .chat-message a,
    .summery,
    .recent-post .new_title,
    .call_service,
    p,
    .stat-label,
    .btn,
    .hero-sub,
    .service-list span,
    .checkAnswer,
    .app-btns .sub-title,
    .hot-title,
    .trend_column .title{
        font-size: 12px;
    }
    .badge-gradient{
        font-size: 11px;
    }
    .recent_title, .blog-content strong {
        line-height: 22px;
        font-weight: 500;
        font-size: 18px;
    }
    .small, small {
        font-size: 0.575em;
    }
    .new_title{
        margin: 10px 0 15px;
    }
    .category-list{
        padding: 10px;
    }
    .category-list li a img {
        width: 20px;
        padding: 7px 4px;
        height: 25px;
    }
    .category-list li a{
        border-radius: 12px;
    }
    .widget-title{
        font-size: 14px;
    }
    .call_service .btn-inner {
        display: flex;
        gap: 2px;
    }
    .app-btns{
        margin-top: 30px;
    }
    .hot-cta{
        padding: 4px 12px;
        font-size: 12px;
    }
    .hot-card{
        padding: 7px;
    }
    #quiz-science .question-text {
        font-size: 14px;
    }
    .ai-chat-window{
        padding: 5px;
    }
}
@media(max-width: 1280px){
    .recent_title, .blog-content strong {
        font-size: 16px;
    }
}
@media(max-width: 1200px){
    .btn-primary, .zp-btn-style-1{
        min-width: fit-content;
    }
    .app-btns{
        min-width: 100%;
    }
    .app-btns .ri {
        font-size: 30px;
    }
    .app-btns:last-child{
        margin-top: 15px;
    }
    .mobile-icon+div{
        flex-wrap: wrap;
    }
    .footer-link{
        word-wrap: break-word;
    }
}
@media(max-width: 800px){
    .hdr-search{
        max-width: 40%;
    }
    html,body{
        overflow-x: hidden;
    }
    .right-bar .close{
        display: none;
    }
    .right-bar {
        position: fixed;
        top: 0;
        width: 100%;
        background: #ffffff;
        z-index: 1052;
        left: 0;
        height: 100%;
        overflow-y: auto;
        padding: 40px;
        left: 100%;
        transition: linear 0.3s;
    }
    .right-header{
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .right-bar.active{
        left: 0;
    }
}
@media(max-width: 768px){
    .category-list {
        display: flex;
        overflow-x: auto;
        height: auto;
        overflow-x: auto;
        gap: 20px;
        margin-top: 10px;
        margin-bottom: 0px;
    }
    .category-list li a{
        padding: 2px 15px 2px 10px;
    }
    .category-list {
        padding: 10px 10px 0px;
        height: auto;
        margin-bottom: 20px;
    }
}