/* General Styling & Variables */
:root {
    --primary-bg: #f0f4f8;
    --secondary-bg: #ffffff;
    --primary-text: #1e293b;
    --secondary-text: #64748b;
    --accent-color: #3b82f6;
    --accent-color-dark: #2563eb;
    --error-color: #ef4444;
    --border-color: #e2e8f0;
    --shadow-color: rgba(99, 102, 241, 0.1);
    --font-family: 'Inter', sans-serif;
}

/* Base & Body */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--primary-bg);
    color: var(--primary-text);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 1rem;
}

.page-wrapper {
    width: 100%;
    max-width: 720px;
}

/* --- Main Header & Navigation --- */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-text);
    text-decoration: none;
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    text-decoration: none;
    color: var(--secondary-text);
    font-weight: 500;
    transition: color 0.2s;
}

.main-nav a:hover {
    color: var(--accent-color);
}

.main-nav a.active {
    color: var(--accent-color);
    font-weight: 700;
}


/* --- Calculator Container --- */
.calculator-container {
    background-color: var(--secondary-bg);
    border-radius: 1.5rem;
    box-shadow: 0 10px 25px -5px var(--shadow-color), 0 8px 10px -6px var(--shadow-color);
    overflow: hidden;
}

.calculator-header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.title {
    font-size: 2rem;
    font-weight: 800;
}

.subtitle {
    font-size: 1rem;
    color: var(--secondary-text);
    margin-top: 0.25rem;
}

.calculator-body {
    padding: 2rem;
}

/* Input Section */
.input-group, .date-group {
    margin-bottom: 1.5rem;
}

.input-group label, .date-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--secondary-text);
    margin-bottom: 0.5rem;
}

.amount-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--primary-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.amount-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.amount-wrapper span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-text);
    padding-left: 1rem;
}

.amount-input {
    width: 100%;
    border: none;
    background: transparent;
    font-size: 2rem;
    font-weight: 700;
    padding: 0.75rem 1rem 0.75rem 0.5rem;
    outline: none;
    color: var(--primary-text);
    text-align: right;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield;
}

.date-selectors {
    display: flex;
    gap: 1rem;
    flex-direction: column;
}

@media (min-width: 640px) {
    .date-selectors {
        flex-direction: row;
    }
}

.date-group {
    flex: 1;
}

.date-inputs {
    display: flex;
    gap: 0.5rem;
}

.date-select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--primary-bg);
    cursor: pointer;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3E%3C/svg%3E");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.date-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* Divider */
.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 1rem 0 2rem;
}

/* Results Section */
.result-label {
    text-align: center;
    font-size: 1rem;
    color: var(--secondary-text);
}

.result-value {
    text-align: center;
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    margin: 0.5rem 0 1.5rem;
    word-break: break-all;
}

@media (min-width: 640px) {
    .result-value {
        font-size: 4rem;
    }
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    text-align: center;
}

@media (min-width: 640px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-item {
    background-color: var(--primary-bg);
    padding: 1rem;
    border-radius: 0.75rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--secondary-text);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
}

/* Error Message */
.error-message {
    text-align: center;
    color: var(--error-color);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hidden {
    display: none;
}

/* --- CTA Section --- */
.cta-section {
    text-align: center;
    margin: 2.5rem 0;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: #ffffff;
    background-color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 0.75rem;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}

.cta-button:hover {
    background-color: #ffffff;
    color: var(--accent-color);
}


/* --- Content Pages (About, Contact, Privacy) --- */
.content-container {
    background: var(--secondary-bg);
    padding: 1rem 2rem 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 10px 25px -5px var(--shadow-color);
}

.content-section {
    margin-bottom: 2.5rem;
}
.content-section:last-child {
    margin-bottom: 0;
}

.content-section h1 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.content-section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.content-section p, .content-section li {
    color: var(--secondary-text);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.content-section ul {
    list-style-position: outside;
    padding-left: 1.5rem;
}

/* FAQ Accordion */
.faq-item {
    border-bottom: 1px solid var(--border-color);
}
.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 500;
    padding: 1.25rem 0;
    cursor: pointer;
    list-style: none; /* Remove default marker */
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::-webkit-details-marker {
    display: none; /* Hide for Chrome/Safari */
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent-color);
    transition: transform 0.2s ease-in-out;
}

.faq-item[open] > .faq-question::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-answer {
    padding-bottom: 1.25rem;
}

/* Author Bio Section */
.author-bio {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.author-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.author-text {
    font-size: 0.95rem;
    max-width: 500px;
    margin: 0 auto 1.5rem auto;
}

.author-socials {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.author-socials a {
    color: var(--secondary-text);
    transition: color 0.2s ease-in-out;
}

.author-socials a:hover {
    color: var(--accent-color);
}

/* --- Contact Form --- */
.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.contact-form label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: var(--font-family);
    font-size: 1rem;
    background-color: var(--primary-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.contact-form textarea {
    resize: vertical;
}

.submit-button {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 0.5rem;
    background-color: var(--accent-color);
    color: white;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
}

.submit-button:hover {
    background-color: var(--accent-color-dark);
}

.form-feedback {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #dbeafe;
    color: #1e40af;
    border-radius: 0.5rem;
    text-align: center;
}

/* --- Links --- */
.internal-link {
    color: var(--accent-color);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s;
}

.internal-link:hover {
    color: var(--accent-color-dark);
    text-decoration: underline;
}

/* --- Page Footer --- */
.page-footer {
    text-align: center;
    padding: 2rem 1rem 1rem;
    font-size: 0.875rem;
    color: var(--secondary-text);
}

.page-footer .footer-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.page-footer p {
    margin-top: 0.5rem;
}