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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --card-hover-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --border-radius: 12px;
    --transition: all 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: white;
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.25rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.125rem;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
}

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

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

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

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

/* Section Styles */
section {
    padding: 64px 0;
}

section h2 {
    font-size: 2rem;
    margin-bottom: 32px;
    text-align: center;
    color: var(--text-color);
}

/* Translator Section */
.translator-section {
    background-color: white;
}

.translator-card {
    background: var(--background-color);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--card-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.translator-mode {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.mode-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.mode-btn:hover:not(.active) {
    border-color: var(--secondary-color);
}

.translator-inputs {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 500;
    color: var(--text-color);
}

.input-group textarea {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    resize: vertical;
    min-height: 120px;
    transition: var(--transition);
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.translator-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.translator-actions .btn {
    flex: 1;
    min-width: 120px;
}

.status-message {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.875rem;
    display: none;
}

.status-message.success {
    background-color: #dcfce7;
    color: #166534;
    display: block;
}

.status-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    display: block;
}

/* Alphabet Section */
.alphabet-section {
    background-color: var(--background-color);
}

.alphabet-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 16px;
}

.alphabet-card,
.number-card,
.punctuation-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.alphabet-card:hover,
.number-card:hover,
.punctuation-card:hover {
    box-shadow: var(--card-hover-shadow);
    transform: translateY(-2px);
}

.alphabet-card .letter,
.number-card .number,
.punctuation-card .symbol {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.alphabet-card .morse,
.number-card .morse,
.punctuation-card .morse {
    font-family: 'Courier New', monospace;
    font-size: 1.125rem;
    color: var(--text-light);
}

/* Numbers Section */
.numbers-section {
    background-color: white;
}

.numbers-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 16px;
}

/* Punctuation Section */
.punctuation-section {
    background-color: var(--background-color);
}

.punctuation-table {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 16px;
}

/* Learn Section */
.learn-section {
    background-color: white;
}

.learn-content {
    max-width: 800px;
    margin: 0 auto;
}

.learn-content h3 {
    font-size: 1.5rem;
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--text-color);
}

.learn-content p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.learn-content ul {
    margin-bottom: 16px;
    padding-left: 24px;
}

.learn-content li {
    margin-bottom: 8px;
    line-height: 1.8;
}

/* Practice Section */
.practice-section {
    background-color: var(--background-color);
}

.practice-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--card-shadow);
    max-width: 600px;
    margin: 0 auto;
}

.practice-mode {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.practice-mode-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.practice-mode-btn.active {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

.practice-mode-btn:hover:not(.active) {
    border-color: var(--secondary-color);
}

.practice-question {
    text-align: center;
    margin-bottom: 24px;
}

.practice-question p {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--text-light);
}

.morse-display {
    font-family: 'Courier New', monospace;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: 4px;
}

.answer-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.answer-btn {
    padding: 16px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.answer-btn:hover {
    border-color: var(--primary-color);
    background-color: #f0f9ff;
}

.answer-btn.correct {
    background-color: #dcfce7;
    border-color: #22c55e;
    color: #166534;
}

.answer-btn.incorrect {
    background-color: #fee2e2;
    border-color: #ef4444;
    color: #991b1b;
}

.feedback {
    text-align: center;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 24px;
    font-weight: 500;
    display: none;
}

.feedback.correct {
    background-color: #dcfce7;
    color: #166534;
    display: block;
}

.feedback.incorrect {
    background-color: #fee2e2;
    color: #991b1b;
    display: block;
}

.practice-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.practice-controls .btn {
    flex: 1;
}

.score-display {
    display: flex;
    justify-content: center;
    gap: 32px;
    font-size: 1.125rem;
    color: var(--text-light);
}

.score-display strong {
    color: var(--text-color);
}

/* Resources Section */
.resources-section {
    background-color: white;
}

.resources-content {
    max-width: 800px;
    margin: 0 auto;
}

.resources-content p {
    margin-bottom: 16px;
    line-height: 1.8;
}

.resources-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.resources-content a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: #1e293b;
    color: white;
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-brand h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.footer-brand p {
    color: #94a3b8;
    font-size: 0.875rem;
}

.footer-links ul {
    list-style: none;
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #334155;
    color: #94a3b8;
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: var(--card-shadow);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }

    .nav.active {
        max-height: 300px;
    }

    .nav-list {
        flex-direction: column;
        padding: 16px;
        gap: 0;
    }

    .nav-list li {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-list li:last-child {
        border-bottom: none;
    }

    .hero-content h1 {
        font-size: 1.875rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .alphabet-table,
    .numbers-table,
    .punctuation-table {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: 12px;
    }

    .alphabet-card,
    .number-card,
    .punctuation-card {
        padding: 16px;
    }

    .alphabet-card .letter,
    .number-card .number,
    .punctuation-card .symbol {
        font-size: 1.25rem;
    }

    .alphabet-card .morse,
    .number-card .morse,
    .punctuation-card .morse {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
    }

    .footer-links ul {
        flex-wrap: wrap;
        gap: 16px;
    }

    .translator-actions {
        flex-direction: column;
    }

    .translator-actions .btn {
        width: 100%;
    }

    .answer-options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    section {
        padding: 48px 0;
    }

    .hero {
        padding: 48px 0;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .translator-card,
    .practice-card {
        padding: 24px;
    }

    .alphabet-table,
    .numbers-table,
    .punctuation-table {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

button:focus-visible,
a:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}