:root {
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --accent-color: #000000;
    --accent-hover: #374151;
    --border-color: #e5e7eb;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 1100px;
    width: 100%;
    height: 100%;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

header {
    text-align: center;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.05em;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

main {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    width: 100%;
}

.word-card-container {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.word-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3rem 2rem;
    width: 280px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeIn 0.5s ease forwards;
}

.word-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}

.number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-primary);
    background: #f3f4f6;
    width: 100px;
    height: 100px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.word {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
}

.refresh-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    height: 150px;
    width: 150px;
}

.refresh-btn:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.15);
}

.refresh-btn:active {
    transform: scale(0.95);
}

.refresh-btn svg {
    transition: transform 0.3s ease;
    width: 32px;
    height: 32px;
}

.refresh-btn:hover svg {
    transform: rotate(180deg);
}

@media (max-width: 860px) {
    main {
        flex-direction: column;
        gap: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .refresh-btn {
        flex-direction: row;
        height: auto;
        width: auto;
        padding: 1rem 2rem;
        border-radius: 50px;
    }
    
    .word-card-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .word-card {
        padding: 1.5rem 1rem;
        gap: 1rem;
    }
    
    .number {
        width: 70px;
        height: 70px;
        font-size: 2.5rem;
    }
    
    .word {
        font-size: 1.4rem;
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animating {
    animation: bounceIn 0.5s ease forwards;
}

@keyframes bounceIn {
    0% { transform: scale(0.9); opacity: 0; }
    50% { transform: scale(1.05); opacity: 0.8; }
    100% { transform: scale(1); opacity: 1; }
}

/* Menu Button */
.menu-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
    z-index: 100;
}

.menu-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.menu-btn:active {
    transform: scale(0.95);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: var(--card-bg);
    padding: 3rem 2rem;
    border-radius: 20px;
    max-width: 500px;
    width: 90%;
    max-height: 85vh; /* added for scroll */
    overflow-y: auto; /* added for scroll */
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.modal-content p {
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.modal-content h3 {
    margin: 1.5rem 0 1rem;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.modal-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s ease;
}

.close-btn:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

@media (max-width: 860px) {
    .menu-btn {
        bottom: 1rem;
        right: 1rem;
        width: 50px;
        height: 50px;
    }
}