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

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #0B1120 0%, #1A2635 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: system-ui, sans-serif;
    padding: 1.5rem;
}

.verify-container {
    max-width: 500px;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    border-radius: 2.5rem;
    box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.4);
    overflow: hidden;
}

.verify-header {
    background: linear-gradient(135deg, #1F4A6E 0%, #0F3A58 100%);
    padding: 1.5rem 2rem;
    text-align: center;
    color: white;
}

.verify-header h2 {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.verify-header p {
    font-size: 0.85rem;
    opacity: 0.85;
    margin-top: 0.4rem;
}

.math-area {
    padding: 2rem;
    text-align: center;
    background: #FFFFFF;
}

.equation-block {
    background: #F8FAFE;
    border-radius: 2rem;
    padding: 1.8rem 1rem;
    margin-bottom: 2rem;
    border: 1px solid #EFF3F8;
}

.equation {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.25rem;
    font-weight: 700;
    font-size: 3.2rem;
    font-family: monospace;
}

.equation .num {
    background: #FFFFFF;
    padding: 0.2rem 0.9rem;
    border-radius: 1.5rem;
    min-width: 85px;
    text-align: center;
    color: #0A1E2F;
    font-weight: 800;
}

.equation .operator {
    background: transparent;
    font-size: 3rem;
    color: #2C3E66;
    padding: 0 0.2rem;
}

.equation .question-mark {
    background: #EFF3F8;
    color: #1E2F47;
}

.answer-input {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1.3rem;
    text-align: center;
    border: 2px solid #E2E8F0;
    border-radius: 3rem;
    outline: none;
    margin-top: 1rem;
}

.answer-input:focus {
    border-color: #3B82F6;
}

.verify-btn {
    width: 100%;
    padding: 1rem;
    background: #1F4A6E;
    color: white;
    border: none;
    border-radius: 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 1rem;
}

.verify-btn:hover {
    background: #0F3A58;
}

.message-area {
    margin-top: 1.2rem;
    font-size: 0.85rem;
    text-align: center;
    min-height: 2.8rem;
}

.error-msg {
    color: #B91C1C;
    background: #FEF2F2;
    padding: 0.6rem 1rem;
    border-radius: 3rem;
}

.success-msg {
    color: #166534;
    background: #E6F7EC;
    padding: 0.6rem 1rem;
    border-radius: 3rem;
}

@media (max-width: 480px) {
    .equation { font-size: 2rem; }
    .equation .num { min-width: 55px; }
    .math-area { padding: 1.5rem; }
}