/* Reset & base */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f4f8f9;
    color: #333;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover,
a:focus {
    text-decoration: underline;
}

/* Header */
.header {
    background-color: #00796b;
    padding: 15px 20px;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    font-weight: 600;
    font-size: 18px;
    user-select: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.header p {
    margin: 0;
}

.blink-call-button {
    background-color: #ffff83;
    padding: 10px 22px;
    animation: blink 1s steps(2, start) infinite;
    color: #000;
    font-weight: 700;
    font-size: 16px;
    border-radius: 25px;
    box-shadow: 0 0 10px rgba(255, 255, 0, 0.4);
    transition: background-color 0.3s ease;
    display: inline-block;
}

.blink-call-button:hover,
.blink-call-button:focus {
    background-color: #fff35f;
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

/* Container */
.container {
    max-width: 960px;
    margin: 30px auto;
    background: #fff;
    padding: 30px 25px;
    border-radius: 10px;
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.08);
}

/* Headings */
h1,
h2 {
    color: #00796b;
    margin-bottom: 15px;
    font-weight: 700;
}

h3 {
    margin-top: 0;
    margin-bottom: 20px;
    font-weight: 600;
    color: #004d40;
}

p {
    font-size: 16px;
    margin-bottom: 20px;
}

/* Thank You Section */
.thank-you {
    text-align: center;
    margin-bottom: 40px;
}

iframe {
    width: 100%;
    height: 440px;
    border-radius: 12px;
    margin: 20px 0 40px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    display: block;
    background-color: #000;
    outline: none;
    object-fit: contain;
}

@media (max-width: 600px) {
    iframe {
        height: 275px;
        object-fit: cover;
    }
}

/* Usage & Benefits Section */
.usage-benefits-section {
    padding: 0px 20px;
    background: #fff;
    margin-bottom: 40px;
}

.usage-benefits-section .container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.usage-benefits-section .column {
    flex: 1 1 450px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

/* Image styling */
.how-to-use img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    display: block;
    object-fit: cover;
}

/* Checklist styles */
ul.checklist {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

ul.checklist li {
    position: relative;
    padding-left: 35px;
    margin-bottom: 14px;
    font-size: 16px;
    line-height: 1.5;
    color: #333;
    transition: color 0.3s ease;
}

ul.checklist li:hover {
    color: #00796b;
}

/* SVG check icon before each li */
ul.checklist li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    width: 20px;
    height: 20px;
    background: url('data:image/svg+xml;utf8,<svg fill="%2300796b" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z"/></svg>') no-repeat center center;
    background-size: contain;
}

@media (max-width: 900px) {
    .usage-benefits-section .container {
        flex-direction: column;
    }

    .usage-benefits-section .column {
        flex: 1 1 100%;
    }
}

/* FAQ Section */
.faq-section {
    margin-top: 40px;
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 40px;
}

.faq {
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgb(0 0 0 / 0.05);
    transition: box-shadow 0.3s ease;
}

.faq:hover {
    box-shadow: 0 4px 15px rgb(0 0 0 / 0.15);
}

.faq-question {
    background: #f1f1f1;
    padding: 15px 20px;
    cursor: pointer;
    font-weight: 700;
    position: relative;
    user-select: none;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: #e0f2f1;
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: 20px;
    font-size: 22px;
    transition: transform 0.3s ease;
    font-weight: 700;
    color: #00796b;
}

.faq.open .faq-question::after {
    content: '-';
    transform: rotate(180deg);
}

.faq-answer {
    padding: 15px 20px;
    display: none;
    background: white;
    border-top: 1px solid #ddd;
    font-size: 15px;
    line-height: 1.5;
}

.faq.open .faq-answer {
    display: block;
    animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

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

/* Call Button */
.call-button {
    display: block;
    text-align: center;
    background: #d32f2f;
    color: white;
    text-decoration: none;
    padding: 15px 24px;
    border-radius: 6px;
    font-size: 18px;
    margin: 30px auto 60px;
    max-width: 320px;
    font-weight: 700;
    transition: background 0.3s ease;
    animation: blink-animation 1.2s infinite;
    box-shadow: 0 0 10px rgba(211, 47, 47, 0.4);
}

.call-button:hover,
.call-button:focus {
    background: #b71c1c;
    outline: none;
}

@keyframes blink-animation {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
        box-shadow: 0 0 10px rgba(211, 47, 47, 0.6);
    }

    50% {
        opacity: 0.6;
        transform: scale(1.05);
        box-shadow: 0 0 20px rgba(211, 47, 47, 0.8);
    }
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    font-size: 14px;
    color: #888;
    background: #fff;
    margin-top: 30px;
    user-select: none;
}

/* Responsive tweaks */
@media (max-width: 600px) {
    .container {
        padding: 20px 15px;
    }

    .header {
        font-size: 16px;
    }

    .blink-call-button {
        font-size: 14px;
        padding: 8px 18px;
    }

    h1,
    h2,
    h3 {
        font-weight: 600;
    }

    .call-button {
        font-size: 16px;
        padding: 12px 20px;
    }
}