:root {
    --bg-color: #fafafa;
    --text-color: #333333;
    --muted-text: #666666;
    --border-color: #dcdcdc;
    --divider-color: #e0e0e0;
    --input-bg: #ffffff;
    --focus-outline: #a0a0a0;
    --button-bg: #5a6b7c; /* Muted slate blue/grey */
    --button-text: #ffffff;
    --font-header: 'Merriweather', serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align top to prevent clipping on long pages */
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px; /* Mobile-first but constrained on desktop */
    margin: 40px auto; /* Add top margin for visual balance */
    text-align: center;
    padding: 20px 0;
}

/* Zone A: Header */
.zone-a {
    margin-bottom: 24px;
}

.cross {
    font-size: 1.2rem;
    color: var(--muted-text);
    margin-bottom: 8px;
    opacity: 0.7;
}

h1 {
    font-family: var(--font-header);
    font-size: 1.5rem; /* 24px */
    font-weight: 700;
    color: var(--text-color);
}

.divider {
    height: 1px;
    background-color: var(--divider-color);
    width: 60px;
    margin: 20px auto;
}

/* Zone B: Instruction */
.zone-b {
    margin-bottom: 32px;
}

.instruction-text {
    font-size: 1.1rem; /* ~18px */
    margin-bottom: 8px;
}

.helper-text {
    font-size: 0.9rem;
    color: var(--muted-text);
}

/* Zone C: Form */
.zone-c {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 1rem;
    background-color: var(--input-bg);
    transition: border-color 0.2s, outline 0.2s;
    -webkit-appearance: none; /* Remove iOS shadows */
    appearance: none;
}

input:focus {
    outline: 1px solid var(--focus-outline);
    border-color: var(--focus-outline);
}

button {
    width: 100%;
    padding: 14px; /* ~48px height */
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
    -webkit-tap-highlight-color: transparent;
}

button:active {
    opacity: 0.9;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Zone D: Response */
.zone-d {
    margin-top: 40px;
    padding: 20px;
    animation: fadeIn 0.5s ease;
}

#response-message {
    font-family: var(--font-header);
    font-size: 1.25rem;
    line-height: 1.5;
    color: var(--text-color);
}

.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    h1 {
        font-size: 1.25rem; /* 20px */
    }
    
    .instruction-text {
        font-size: 1rem; /* 16px */
    }
    
    .container {
        width: 90%;
    }
}

/* SEO Content Section - Keeping it calm and secondary */
.seo-content {
    margin-top: 40px;
    padding-bottom: 40px;
    text-align: left;
    line-height: 1.7;
}

.seo-content h2 {
    font-family: var(--font-header);
    font-size: 1.25rem;
    color: var(--text-color);
    margin-top: 30px;
    margin-bottom: 15px;
    border-bottom: 1px solid #eee;
    padding-bottom: 8px;
}

.seo-content h3 {
    font-family: var(--font-header);
    font-size: 1.1rem;
    color: var(--text-color);
    margin-top: 25px;
    margin-bottom: 10px;
    font-weight: 600;
}

.seo-content p {
    margin-bottom: 15px;
}

.seo-content ul {
    margin-bottom: 15px;
    padding-left: 20px;
}

.seo-content li {
    margin-bottom: 8px;
}

.seo-content strong {
    font-weight: 600;
    color: #333;
}