/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #f8f9fa;
}

/* Header and Navigation */
header {
    background-color: #fff;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

nav {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.125rem;
    color: #000;
    text-decoration: none;
}

.nav-logo svg {
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: #000;
    text-decoration: underline;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Hero Section */
.hero {
    padding: 1.5rem 0 0.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: #000;
    text-transform: uppercase;
    text-align: center;
}

.intro {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #000;
}

.intro p {
    margin-bottom: 1rem;
}

.intro p:last-child {
    margin-bottom: 0;
}

/* Content Sections */
.content-section {
    padding: 0;
    max-width: 1000px;
    margin: 0 auto;
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
    color: #000;
    text-transform: uppercase;
    text-align: center;
}

p {
    margin-bottom: 1rem;
    color: #374151;
}

p:last-child {
    margin-bottom: 0;
}

/* Main content link styling */
main a {
    color: #ff4d01; /* dark orange */
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s, text-decoration 0.2s;
}

main a:hover {
    color: #000;
    text-decoration: underline;
}

main a:focus {
    outline: none;
    color: #000;
    text-decoration: underline;
}

blockquote {
    background-color: #fff;
    padding: 1.5rem;
    border-left: 4px solid #000;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin: 1.5rem 0;
    color: #374151;
    font-style: italic;
    line-height: 1.6;
}

blockquote p {
    margin-bottom: 0.5rem;
    color: #374151;
}

blockquote p:last-child {
    margin-bottom: 0;
}

blockquote cite {
    display: block;
    font-style: normal;
    font-weight: 600;
    color: #000;
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

blockquote cite::before {
    content: "— ";
}


/* Lists */
ul, ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: #374151;
}

ul {
    list-style-type: disc;
    list-style-position: inside;
}

ol {
    list-style-type: decimal;
    list-style-position: inside;
}

li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

li:last-child {
    margin-bottom: 0;
}

/* Fluid Image Class */
.fluid {
    display: block;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    height: auto;
    border-radius: 12px;
}

/* Prices Section */
.prices-section {
    padding: 1.5rem 0 1.5rem 0;
}

.update-timer {
    text-align: center;
    font-size: 0.875rem;
    color: #6b7280;
    margin-bottom: 1.5rem;
}

.crypto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.crypto-card {
    background-color: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.crypto-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1a1a1a;
}

.crypto-card .price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #000;
}

/* Calculator Section */
.calculator-section {
    padding: 0;
}

.calculator-container {
    background-color: #ff4d01;
    padding: 1rem 2rem 2rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    max-width: 800px;
    margin: 0 auto;
}

.calculator-container h2 {
    color: #fff;
    text-align: center;
    margin-bottom: 0.75rem;
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: #fff;
    font-size: 0.9rem;
}

.form-group input,
.form-group select {
    padding: 0.75rem;
    border: 1px solid #ffa366;
    border-radius: 4px;
    font-size: 1rem;
    background-color: #fff;
    color: #1a1a1a;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #ff7733;
    box-shadow: 0 0 0 3px rgba(255, 77, 1, 0.2);
}

.calculator-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.btn-calculate,
.btn-reset {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-calculate {
    background-color: #059669;
    color: #fff;
}

.btn-calculate:hover {
    background-color: #047857;
}

.btn-reset {
    background-color: #000;
    color: #fff;
}

.btn-reset:hover {
    background-color: #1a1a1a;
}

.calculator-result {
    background-color: #dbeafe;
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid #93c5fd;
    color: #1e40af;
    font-size: 1.125rem;
}

.calculator-result.hidden {
    display: none;
}

.calculator-result strong {
    font-weight: 700;
    color: #1e3a8a;
}

/* FAQ Section */
.faq-section {
    padding: 3rem 0;
    max-width: 1000px;
    margin: 0 auto;
}

details {
    background-color: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    margin-bottom: 0.75rem;
}

summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    color: #1a1a1a;
}

summary:hover {
    background-color: #f9fafb;
}

details[open] summary {
    border-bottom: 1px solid #e5e7eb;
}

details p {
    padding: 1rem 1.25rem;
    color: #374151;
}

/* Author Section */
.author-section {
    background-color: #fff;
    border-radius: 8px;
    padding: 1.5rem 2rem 2rem 2rem;
    margin: 2rem auto;
    max-width: 1000px;
}

/* Footer */
footer {
    background-color: #1a1a1a;
    color: #fff;
    text-align: center;
    padding: 2rem 1.5rem;
    margin-top: 4rem;
}

footer p {
    font-size: 0.875rem;
    color: #fff;
    margin-bottom: 0.5rem;
}

footer p:last-child {
    margin-bottom: 0;
}

footer a {
    color: #d1d5db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

footer a:hover {
    color: #fff;
    text-decoration: underline;
}

/* Burger Menu */
.burger {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    color: #000;
    padding: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 880px) {
    .burger {
        display: block;
    }

    .nav-container {
        position: relative;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: #fff;
        border-top: 1px solid #e5e7eb;
        border-bottom: 1px solid #e5e7eb;
        padding: 1rem 1.5rem;
        gap: 1rem;
        font-size: 0.9rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .nav-links.open {
        display: flex;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .crypto-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .calculator-buttons {
        grid-template-columns: 1fr;
    }

    .calculator-container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .nav-logo span {
        font-size: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    h1 {
        font-size: 1.25rem;
    }

    .hero {
        padding: 2rem 0 1.5rem;
    }

    main {
        padding: 0 1rem;
    }
}