.esp32-pwm-tool {
    max-width: 1100px;
    margin: 30px auto;
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

.esp32-pwm-tool h2,
.esp32-pwm-tool h3 {
    margin-top: 0;
}

.esp32-pwm-tool .intro {
    font-size: 1.05rem;
    margin-bottom: 25px;
}

.esp32-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.esp32-card {
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 14px;
    padding: 22px;
    margin-bottom: 20px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.05);
}

.esp32-card label {
    display: block;
    font-weight: bold;
    margin-top: 14px;
    margin-bottom: 6px;
}

.esp32-card input,
.esp32-card select {
    width: 100%;
    padding: 10px;
    border: 1px solid #bbb;
    border-radius: 8px;
    font-size: 15px;
}

.input-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 10px;
}

.esp32-card button {
    margin-top: 18px;
    padding: 12px 18px;
    background: #1f6feb;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
}

.esp32-card button:hover {
    background: #174ea6;
}

.result-line {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid #eee;
    padding: 9px 0;
    gap: 15px;
}

.result-line strong {
    text-align: right;
}

.warnings {
    margin-top: 16px;
}

.warning {
    background: #fff3cd;
    border-left: 5px solid #ffcc00;
    padding: 10px;
    margin-top: 10px;
    border-radius: 6px;
}

.good {
    background: #e7f6ec;
    border-left: 5px solid #28a745;
    padding: 10px;
    margin-top: 10px;
    border-radius: 6px;
}

.led-preview-wrap {
    text-align: center;
}

.led-preview {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: yellow;
    margin: 10px auto;
    box-shadow: 0 0 25px rgba(255, 230, 0, 0.7);
    opacity: 0.5;
}

.esp32-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

.esp32-table th,
.esp32-table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

.esp32-table th {
    background: #f5f5f5;
}

pre {
    background: #111827;
    color: #e5e7eb;
    padding: 16px;
    overflow-x: auto;
    border-radius: 10px;
    font-size: 14px;
}

.copy-btn {
    margin-bottom: 10px;
}

.content-card p {
    margin-bottom: 16px;
}

@media (max-width: 800px) {
    .esp32-grid {
        grid-template-columns: 1fr;
    }

    .result-line {
        flex-direction: column;
    }

    .result-line strong {
        text-align: left;
    }
}