:root{
    --primary:#667eea; /* Wisdom Brains primary blue */
    --secondary:#764ba2; /* Wisdom Brains secondary purple */
    --accent:#f093fb; /* Light accent color */
    --text-dark:#2c3e50; /* Dark text color */
    --text-light:#6c757d; /* Light text color */
    --background:#f8fafc; /* Light background */
    --white:#ffffff; /* Pure white */
    --shadow:0 4px 15px rgba(0,0,0,0.1); /* Standard shadow */
}
*{box-sizing:border-box;margin:0;padding:0}
body{
    font-family:'Arial', sans-serif;
    background:white;
    min-height:100vh;
    display:flex;
    flex-direction:column;
    color:var(--text-dark);
    overflow-x:hidden; /* Prevent horizontal scroll on body */
}
header{
    background-color:#f8fafc;
    color:#2c3e50;
    text-align:center;
    padding:35px 20px;
    box-shadow:var(--shadow);
    display:flex;
    align-items:flex-start;
    justify-content:space-between;
    position:relative;
    min-height:120px;
}

.logo-container{
    position:absolute;
    top:20px;
    left:20px;
    z-index:10;
}

header .logo{
    width:clamp(105px, 18vw, 180px);
    height:auto;
    max-width:100%;
}

.header-center{
    flex:1;
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:15px;
    padding-left:clamp(0px, calc(18vw + 20px), 200px);
    padding-right:clamp(10px, 2vw, 20px);
    min-width:0;
}

.header-images{
    display:flex;
    gap:10px;
    justify-content:center;
}

.header-img{
    width:120px;
    height:120px;
    object-fit:contain;
    opacity:0.9;
    transition:opacity 0.3s ease;
    animation: dance 3s ease-in-out infinite;
}

.header-img:nth-child(2){
    animation-delay: 0.5s;
}

.header-img:nth-child(3){
    animation-delay: 1s;
}

.header-img:nth-child(4){
    animation-delay: 1.5s;
}

.header-img:nth-child(5){
    animation-delay: 2s;
}

.header-img:nth-child(6){
    animation-delay: 2.5s;
}

.header-img:hover{
    opacity:1;
    animation-play-state: paused;
}

@keyframes dance {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-8px) rotate(2deg);
    }
    50% {
        transform: translateY(-4px) rotate(-1deg);
    }
    75% {
        transform: translateY(-12px) rotate(1deg);
    }
}

header .header-text{
    text-align:center;
    width:100%;
    max-width:100%;
    word-wrap:break-word;
    overflow-wrap:break-word;
}
header .header-text h1{
    margin-bottom:6px;
    font-weight:600;
    letter-spacing:clamp(0.2px, 0.1vw, 1px);
    font-size:clamp(1.5em, 4vw, 2.4em);
    color:#2c3e50 !important;
    line-height:1.2;
    word-wrap:break-word;
    overflow-wrap:break-word;
    hyphens:auto;
}
header .header-text h2{
    color:#6c757d !important;
    font-weight:400;
    font-size:clamp(0.9rem, 1.8vw, 1.2em);
    line-height:1.3;
    word-wrap:break-word;
    overflow-wrap:break-word;
    hyphens:auto;
}
/* navigation bar */
nav{
    background:#1e3a8a;
    text-align:center;
    padding:10px 0;
    box-shadow:var(--shadow);
    position:relative;
    width:100%;
    margin:0 auto;
    overflow:visible;
}
/* nav structure tweaks */
.nav-toggle{
    display:none;
    background:none;
    border:none;
    color:#fff;
    font-size:1.8rem;
    cursor:pointer;
    position:absolute;
    right:15px;
    top:6px;
    z-index:1000;
}
.nav-links{
    list-style:none;
}
.nav-links,
.nav-links li{
    list-style:none;
    margin:0;
    padding:0;
}
.nav-links{
    /* visible by default on larger screens */
    display:flex;
    flex-direction:row;
    align-items:center;
    justify-content:center;
    gap:clamp(8px, 2vw, 20px); /* space between links */
    width:100%;
    background:#1e3a8a;
    padding:0 clamp(5px, 1vw, 0);
    margin:0 auto;
    text-align:center;
    flex-wrap:wrap;
}
.nav-links .nav-item{
    display:flex;
    align-items:stretch;
}
.nav-links .nav-item a{
    display:flex;
    align-items:center;
    gap:8px;
}
.nav-links .nav-icon{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-size:1em;
}
nav a{
    color:#ffffff;
    margin:0 clamp(4px, 1.2vw, 15px);
    text-decoration:none;
    font-weight:600;
    transition:all .3s ease;
    padding:clamp(6px, 0.8vw, 8px) clamp(10px, 1.5vw, 16px);
    border-radius:6px;
    white-space:nowrap;
    font-size:clamp(0.85rem, 1.1vw, 1rem);
}
nav a:hover{
    background-color:#f97316;
    transform:translateY(-2px);
    box-shadow:0 4px 12px rgba(249, 115, 22, 0.3);
}

/* Active menu item - stays orange */
nav a.active{
    background-color:#f97316;
    color:#ffffff;
    transform:translateY(-2px);
    box-shadow:0 4px 12px rgba(249, 115, 22, 0.3);
}

/* Ensure Font Awesome icons are white for specific menu items */
nav a[href*="add-sub"] i,
nav a[href*="multiplication"] i,
nav a[href*="division"] i,
nav a[href*="whiteboard"] i,
nav a[href*="rules"] i {
    color: #ffffff !important;
    margin-right: 8px;
    font-size: 1em;
}

nav a[href*="add-sub"]:hover i,
nav a[href*="multiplication"]:hover i,
nav a[href*="division"]:hover i {
    color: #ffffff !important;
}

/* Ensure Font Awesome icons are white for active menu items */
nav a.active i {
    color: #ffffff !important;
}

/* Tools landing single-line menu */
.tools-menu-line{
    display:flex;
    flex-wrap:nowrap;
    gap:clamp(10px,1.5vw,18px);
    padding:15px 10px;
    margin:0 auto 35px;
    max-width:1200px;
    overflow-x:auto;
    scrollbar-width:thin;
    scrollbar-color:#94a3b8 transparent;
}

.tools-menu-line::-webkit-scrollbar{
    height:6px;
}

.tools-menu-line::-webkit-scrollbar-track{
    background:transparent;
}

.tools-menu-line::-webkit-scrollbar-thumb{
    background:#94a3b8;
    border-radius:999px;
}

.tool-pill{
    display:flex;
    align-items:center;
    gap:10px;
    padding:12px 18px;
    background:linear-gradient(135deg,#1e3a8a,#4338ca);
    color:#fff;
    text-decoration:none;
    border-radius:999px;
    font-weight:600;
    white-space:nowrap;
    transition:transform .25s ease,box-shadow .25s ease;
    box-shadow:0 6px 16px rgba(67,56,202,.25);
}

.tool-pill:hover{
    transform:translateY(-3px);
    box-shadow:0 10px 20px rgba(67,56,202,.35);
}

.pill-icon{
    width:34px;
    height:34px;
    border-radius:50%;
    background:rgba(255,255,255,.15);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:1.1rem;
}

.pill-icon-text{
    font-size:1.3rem;
    font-weight:700;
}

.pill-label{
    font-size:.95rem;
}

@media(max-width:768px){
    .tools-menu-line{
        flex-wrap:wrap;
        justify-content:center;
        overflow-x:visible;
    }
    
    .tool-pill{
        width:calc(50% - 10px);
        min-width:200px;
        justify-content:center;
    }
}

/* Mobile-only Breadcrumb Navigation */
.breadcrumb-container {
    display: none; /* Hidden by default on desktop */
}

/* Additional styles for tools pages */
.row {
    width: 100%;
    padding: 60px 20px;
    box-sizing: border-box;
}

.tools-hero-row {
    background: white;
    color: #333;
    text-align: center;
}

.tools-hero h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 700;
    color: #333;
}

.tools-hero p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Responsive row padding */
@media(max-width: 768px){
    .row {
        padding: 40px 15px;
    }
    
    .tools-hero h2 {
        font-size: 2rem;
    }
    
    .tools-hero p {
        font-size: 1rem;
        margin-bottom: 30px;
        padding: 0 10px;
    }
}

@media(max-width: 480px){
    .row {
        padding: 30px 10px;
    }
    
    .tools-hero h2 {
        font-size: 1.75rem;
    }
    
    .tools-hero p {
        font-size: 0.95rem;
        margin-bottom: 25px;
    }
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    justify-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #333;
    padding: 30px 20px;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 2px solid #e0e0e0;
    background: white;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 250px;
}

/* Responsive tools grid */
@media(max-width: 768px){
    .tools-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
        padding: 0 15px;
    }
    
    .tool-card {
        max-width: 100%;
        padding: 25px 15px;
    }
}

@media(max-width: 480px){
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .tool-card {
        padding: 20px 15px;
    }
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

.tool-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.8rem;
    color: white;
}

.tool-card span {
    font-weight: 600;
    font-size: 1.1rem;
    text-align: center;
}


.breadcrumb {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: #6c757d;
    justify-content: center;
    padding: 8px 0;
}

.breadcrumb a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.breadcrumb a:hover {
    color: rgba(255,255,255,0.8);
    text-decoration: underline;
}

.breadcrumb .separator {
    margin: 0 8px;
    color: rgba(255,255,255,0.7);
    font-weight: bold;
}

.breadcrumb .current {
    color: rgba(255,255,255,0.9);
    font-weight: 600;
}
main{
    flex:1;
    display:flex;
    align-items:center;
    justify-content:center;
    padding:40px 20px;
}
.cards{
    display:flex;
    flex-wrap:wrap;
    gap:30px;
    max-width:1100px;
    justify-content:center;
}
.card{
    background:var(--white);
    width:260px;
    border-radius:14px;
    padding:35px 25px;
    text-align:center;
    text-decoration:none;
    color:var(--secondary);
    font-weight:600;
    font-size:1.2rem;
    box-shadow:var(--shadow);
    transition:all .3s ease;
    border:1px solid rgba(102, 126, 234, 0.1);
}
.card:hover{
    transform:translateY(-8px);
    box-shadow:0 15px 35px rgba(102, 126, 234, 0.2);
    border-color:var(--primary);
}
footer{
    text-align:center;
    padding:15px 10px;
    font-size:.9em;
    color:var(--text-light);
    margin-top:auto;
    background:var(--white);
    border-top:1px solid rgba(102, 126, 234, 0.1);
}

/* Responsive footer */
@media(max-width: 768px){
    footer {
        padding: 12px 8px;
        font-size: 0.85em;
    }
    
    footer p {
        margin: 4px 0;
        line-height: 1.4;
    }
}

@media(max-width: 480px){
    footer {
        padding: 10px 5px;
        font-size: 0.8em;
    }
    
    footer p {
        margin: 3px 0;
        line-height: 1.3;
    }
}

/* ================= Responsive Header ================= */
@media(max-width: 768px){
    header .header-text h1{
        font-size:clamp(1.5em, 3vw, 1.8em);
        letter-spacing:0.3px;
    }
    header .header-text h2{
        font-size:clamp(0.9rem, 1.4vw, 1rem);
    }
    
    .header-images{
        gap:8px;
        display:flex;
        justify-content:center;
        flex-wrap:wrap;
    }
    
    .header-img{
        width:75px;
        height:75px;
    }
    
    header .header-text{
        margin:0;
        text-align:center;
    }
    /* Improved mobile navigation */
    .nav-toggle{
        display:block;
        padding:8px 12px;
        border-radius:6px;
        transition:background-color 0.2s ease;
        font-size:1.5rem;
    }
    .nav-toggle:hover{
        background-color:rgba(255,255,255,0.1);
    }
    
    .nav-links{
        display:none;
        flex-direction:column;
        position:absolute;
        top:100%;
        left:0;
        right:0;
        background:#1e3a8a;
        padding:0;
        z-index:999;
        box-shadow:0 4px 12px rgba(0,0,0,0.15);
        border-top:1px solid rgba(255,255,255,0.1);
        opacity:0;
        transform:translateY(-10px);
        transition:opacity 0.2s ease, transform 0.2s ease;
        gap:0;
        max-height:calc(100vh - 200px);
        overflow-y:auto;
        -webkit-overflow-scrolling:touch;
    }
    
    #main-nav.open .nav-links{
        display:flex;
        opacity:1;
        transform:translateY(0);
    }
    
    .nav-links a{
        margin:0;
        padding:14px 18px;
        border-bottom:1px solid rgba(255,255,255,0.1);
        text-align:left;
        font-size:0.95rem;
        transition:background-color 0.2s ease;
        white-space:normal;
        display:block;
        width:100%;
        box-sizing:border-box;
    }
    
    .nav-links a:last-child{
        border-bottom:none;
    }
    
    .nav-links a:hover{
        background-color:rgba(255,255,255,0.1);
        transform:none;
        box-shadow:none;
    }
    
    .nav-links a.active{
        transform:none;
    }
    
    /* Mobile breadcrumb - show only on mobile */
    .breadcrumb-container.mobile-only {
        display: block;
        border-top: 1px solid rgba(255,255,255,0.2);
        padding: 8px 15px;
    }
    
    .breadcrumb {
        font-size: 0.8rem;
    }
    
    .breadcrumb .separator {
        margin: 0 6px;
    }
}

/* Large tablets - transition zone */
@media(max-width: 1100px) and (min-width: 1001px){
    .nav-links{
        gap:clamp(6px, 1.5vw, 15px);
    }
    
    nav a{
        margin:0 clamp(4px, 0.8vw, 10px);
        padding:clamp(5px, 0.7vw, 7px) clamp(8px, 1.2vw, 14px);
        font-size:clamp(0.88rem, 1vw, 0.95rem);
    }
}

/* Medium screens (tablets) */
@media(max-width: 1024px){
    header{
        padding:30px 15px;
        min-height:110px;
    }
    
    .logo-container{
        top:15px;
        left:15px;
    }
    
    header .logo{
        width:clamp(130px, 16vw, 150px);
    }
    
    .header-center{
        padding-left:clamp(0px, calc(16vw + 15px), 170px);
        padding-right:15px;
    }
    
    header .header-text h1{
        font-size:clamp(1.8em, 3.5vw, 2.1em);
    }
    header .header-text h2{
        font-size:clamp(1rem, 1.6vw, 1.1em);
    }
    
    /* Navigation adjustments for tablets */
    nav{
        padding:8px 0;
    }
    
    .nav-links{
        gap:clamp(6px, 1.2vw, 12px);
    }
    
    nav a{
        margin:0 clamp(4px, 0.8vw, 8px);
        padding:clamp(5px, 0.6vw, 6px) clamp(8px, 1.2vw, 12px);
        font-size:clamp(0.85rem, 0.95vw, 0.95rem);
    }
    
    nav a[href*="add-sub"] i,
    nav a[href*="multiplication"] i,
    nav a[href*="division"] i,
    nav a[href*="whiteboard"] i,
    nav a[href*="rules"] i {
        margin-right: clamp(4px, 0.6vw, 6px);
        font-size: clamp(0.85em, 0.9vw, 0.9em);
    }
}

/* Critical breakpoint - switch to hamburger menu earlier */
@media(max-width: 1000px){
    /* Navigation adjustments - show hamburger menu */
    .nav-toggle{
        display:block;
        font-size:clamp(1.4rem, 1.8vw, 1.6rem);
        padding:clamp(5px, 0.6vw, 6px) clamp(8px, 1vw, 10px);
    }
    
    .nav-links{
        display:none;
        flex-direction:column;
        position:absolute;
        top:100%;
        left:0;
        right:0;
        background:#1e3a8a;
        padding:0;
        z-index:999;
        box-shadow:0 4px 12px rgba(0,0,0,0.15);
        border-top:1px solid rgba(255,255,255,0.1);
        opacity:0;
        transform:translateY(-10px);
        transition:opacity 0.2s ease, transform 0.2s ease;
        gap:0;
        max-height:calc(100vh - 200px);
        overflow-y:auto;
        -webkit-overflow-scrolling:touch;
    }
    
    #main-nav.open .nav-links{
        display:flex;
        opacity:1;
        transform:translateY(0);
    }
    
    nav a{
        margin:0;
        padding:clamp(12px, 1.4vw, 14px) clamp(15px, 1.8vw, 18px);
        border-bottom:1px solid rgba(255,255,255,0.1);
        text-align:left;
        font-size:clamp(0.9rem, 1vw, 1rem);
        white-space:normal;
        display:block;
        width:100%;
        box-sizing:border-box;
    }
    
    nav a:last-child{
        border-bottom:none;
    }
    
    nav a:hover{
        background-color:rgba(255,255,255,0.1);
        transform:none;
        box-shadow:none;
    }
    
    nav a.active{
        transform:none;
    }
    
    nav a[href*="add-sub"] i,
    nav a[href*="multiplication"] i,
    nav a[href*="division"] i,
    nav a[href*="whiteboard"] i,
    nav a[href*="rules"] i {
        margin-right: 8px;
        font-size: 1em;
    }
    
    /* Show breadcrumb on smaller tablets */
    .breadcrumb-container.mobile-only {
        display: block;
        border-top: 1px solid rgba(255,255,255,0.2);
        padding: clamp(6px, 0.8vw, 8px) clamp(12px, 1.5vw, 15px);
    }
}

/* Small tablets and large phones - stack header vertically to prevent overlap */
@media(max-width: 900px){
    header{
        flex-direction:column;
        padding:clamp(20px, 2.5vw, 25px) clamp(12px, 1.5vw, 15px);
        gap:15px;
        align-items:center;
        text-align:center;
        min-height:auto;
    }
    
    .logo-container{
        position:static;
        margin-bottom:10px;
        display:flex;
        justify-content:center;
        top:auto;
        left:auto;
    }
    
    header .logo{
        width:clamp(120px, 14vw, 135px);
    }
    
    .header-center{
        gap:10px;
        width:100%;
        display:flex;
        flex-direction:column;
        align-items:center;
        padding-left:0;
        padding-right:0;
    }
    
    header .header-text h1{
        font-size:clamp(1.6em, 3.2vw, 1.9em);
        letter-spacing:0.5px;
    }
    header .header-text h2{
        font-size:clamp(0.95rem, 1.5vw, 1.05em);
    }
}

/* Small screens (large phones) */
@media(max-width: 768px){
    header .header-text h1{
        font-size:1.8em;
        letter-spacing:0.3px;
    }
    header .header-text h2{
        font-size:1rem;
    }
    
    .header-center{
        padding-left:0;
        padding-right:0;
    }
}

/* Extra small screens (phones) */
@media(max-width:480px){
    header{
        padding:20px 10px;
    }
    
    header .logo{
        width:105px;
    }
    
    header .header-text h1{
        font-size:1.5em;
        line-height:1.1;
        letter-spacing:0.2px;
        word-wrap:break-word;
        overflow-wrap:break-word;
    }
    header .header-text h2{
        font-size:.9rem;
        line-height:1.2;
        word-wrap:break-word;
        overflow-wrap:break-word;
    }
    .header-img{
        width:60px;
        height:60px;
    }
    
    /* Navigation for extra small screens */
    nav{
        padding:6px 0;
    }
    
    .nav-toggle{
        font-size:1.4rem;
        padding:6px 10px;
        top:4px;
    }
    
    .nav-links a{
        padding:12px 15px;
        font-size:0.9rem;
    }
    
    nav a[href*="add-sub"] i,
    nav a[href*="multiplication"] i,
    nav a[href*="division"] i,
    nav a[href*="whiteboard"] i,
    nav a[href*="rules"] i {
        margin-right: 6px;
        font-size: 0.9em;
    }
    
    .breadcrumb {
        font-size: 0.75rem;
    }
    
    .breadcrumb .separator {
        margin: 0 4px;
    }
}

/* Large screens - prevent content from becoming too wide */
@media(min-width: 1400px){
    .container {
        max-width: 1400px;
        margin: 0 auto;
    }
    
    .tools-grid {
        max-width: 1200px;
    }
    
    /* Keep navigation compact on very large screens */
    .nav-links {
        max-width: 1400px;
        margin: 0 auto;
    }
    
    nav a {
        margin: 0 12px;
    }
}