:root {
    --bg: #f8fafc;
    --text: #0f172a;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #64748b;
    --accent: #f59e0b;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --header-bg: rgba(255, 255, 255, 0.8);
    --footer-bg: #0f172a;
    --footer-text: #f8fafc;
    --f-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --f-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

.dark-mode {
    --bg: #020617;
    --text: #f8fafc;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary: #94a3b8;
    --accent: #fbbf24;
    --card-bg: #0f172a;
    --border: #1e293b;
    --header-bg: rgba(2, 6, 23, 0.8);
}

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

body {
    font-family: var(--f-sans);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.sticky-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--header-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
}

.sticky-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--text);
    letter-spacing: -0.03em;
}

.logo span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border);
    padding: 0.4rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

#theme-toggle:hover {
    background-color: var(--border);
}

/* Main Translator Section */
.main-translator {
    padding: 5rem 0 3rem;
    text-align: center;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.intro-text {
    font-size: 1.125rem;
    color: var(--secondary);
    max-width: 600px;
    margin: 0 auto 3.5rem;
}

.translator-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    text-align: left;
}

.grid-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 850px) {
    .grid-inputs {
        grid-template-columns: 1fr;
    }
    h1 { font-size: 2.5rem; }
}

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

.input-group label {
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--secondary);
}

textarea {
    width: 100%;
    height: 220px;
    padding: 1.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
    background-color: var(--bg);
    color: var(--text);
    font-size: 1.0625rem;
    font-family: var(--f-sans);
    resize: none;
    transition: all 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

#morse-input {
    font-family: var(--f-mono);
    letter-spacing: 0.1em;
    font-weight: 500;
}

.stats {
    font-size: 0.75rem;
    color: var(--secondary);
    font-weight: 500;
    margin-top: 0.25rem;
}

/* Controls */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    align-items: center;
    justify-content: space-between;
}

.action-btns {
    display: flex;
    gap: 0.75rem;
}

.btn {
    padding: 0.625rem 1.25rem;
    border-radius: 0.625rem;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: var(--border);
}

.settings-group {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.setting-item label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary);
    text-transform: uppercase;
    white-space: nowrap;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 80px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Tool Cards Grid */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 1.75rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 20px -10px rgba(0, 0, 0, 0.1);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.card p {
    color: var(--secondary);
    font-size: 0.9375rem;
}

/* FAQ Section */
.faq-section {
    padding: 4rem 0;
}

.faq-section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    letter-spacing: -0.03em;
}

.faq-item {
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background-color: var(--card-bg);
}

.faq-question {
    width: 100%;
    padding: 1.25rem;
    text-align: left;
    background: none;
    border: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text);
}

.faq-answer {
    padding: 0 1.25rem 1.25rem;
    display: none;
    color: var(--secondary);
    font-size: 0.9375rem;
}

.faq-item.active .faq-answer {
    display: block;
}

/* Chart Styles */
.chart-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.chart-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chart-char {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.chart-code {
    font-family: var(--f-mono);
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: 0.1em;
}

/* Blog Styles */
.blog-header {
    padding: 6rem 0 4rem;
    text-align: center;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.blog-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    overflow: hidden;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s;
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.blog-card-content {
    padding: 2rem;
}

.blog-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.blog-card p {
    color: var(--secondary);
    margin-bottom: 1.5rem;
}

.read-more {
    color: var(--primary);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-post {
    max-width: 800px;
    margin: 4rem auto;
}

.blog-post h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    text-align: left;
}

.post-meta {
    color: var(--secondary);
    font-size: 0.875rem;
    margin-bottom: 3rem;
    display: flex;
    gap: 1rem;
}

.blog-content h2 {
    font-size: 1.75rem;
    margin: 2.5rem 0 1rem;
}

.blog-content p {
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
    color: var(--text);
    opacity: 0.9;
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 5rem 0 3rem;
    margin-top: 6rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-section h4 {
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #94a3b8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.9375rem;
}

.footer-section ul li a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 3rem;
    border-top: 1px solid #1e293b;
    color: #64748b;
    font-size: 0.8125rem;
}

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.main-translator, .link-grid, .faq-section {
    animation: slideUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.link-grid { animation-delay: 0.2s; }
.faq-section { animation-delay: 0.4s; }