:root {
    --primary-color: #1a9837;
    --secondary-color: #f8f9fa;
    --accent-color: #1a9837;
    --dark-color: #343a40;
    --light-color: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    line-height: 1.6;
    padding-top: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
    position: relative;
    display: inline-block;
}

.hero h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.hero p {
    font-size: 1.1rem;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

.tool-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.tool-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), #4caf50);
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.tool-header h2 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mode-switch {
    display: flex;
    gap: 0.5rem;
}

.btn-mode {
    background-color: #e9ecef;
    color: var(--dark-color);
}

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

.input-output-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.text-input-container {
    position: relative;
}

.text-input-container label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-stats {
    font-size: 0.9rem;
    color: #666;
}

.text-input-container textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    resize: vertical;
    min-height: 200px;
    transition: all 0.3s;
    background-color: #fff;
}

.text-input-container textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(26, 152, 55, 0.2);
}

.text-input-container textarea::placeholder {
    color: #aaa;
}

.text-input-container textarea[readonly] {
    background-color: #f8f9fa;
    cursor: default;
}

.text-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.conversion-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.options-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
}

.options-section h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
}

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

.option-group {
    position: relative;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.checkbox-group input {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-group span {
    font-weight: 500;
}

.option-description {
    font-size: 0.9rem;
    color: #666;
    margin-left: 26px;
}

.results-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.result-card {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--primary-color);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.result-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    width: 50px;
    height: 50px;
    background-color: rgba(26, 152, 55, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-info {
    flex: 1;
}

.result-label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.3rem;
}

.result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.advanced-stats {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
}

.advanced-stats h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.stat-item {
    background-color: var(--secondary-color);
    padding: 1.2rem;
    border-radius: var(--border-radius);
    transition: transform 0.3s;
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-weight: 600;
    font-size: 1.2rem;
}

.word-cloud-container {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
}

.word-cloud-container h3 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.4rem;
}

.word-cloud {
    background-color: var(--secondary-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    min-height: 150px;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    align-items: center;
}

.word-cloud span {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    background-color: rgba(26, 152, 55, 0.1);
    color: var(--dark-color);
    transition: all 0.3s;
    cursor: default;
}

.word-cloud span:hover {
    background-color: var(--primary-color);
    color: var(--light-color);
    transform: scale(1.1);
}

.about-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    margin-bottom: 3rem;
}

.about-section h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-size: 1.8rem;
}

.about-section h3 {
    margin: 1.5rem 0 1rem;
    color: var(--dark-color);
    font-size: 1.4rem;
}

.about-section p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.about-section a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.about-section a:hover {
    text-decoration: underline;
}

.about-list {
    list-style: none;
    margin: 1rem 0;
}

.about-list li {
    margin-bottom: 0.8rem;
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.about-list li i {
    color: var(--primary-color);
    margin-top: 0.3rem;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 0.7rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background-color: #148f2f;
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Toast notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Responsive styles */
@media (max-width: 768px) {
    .tool-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .mode-switch {
        width: 100%;
    }

    .mode-switch .btn {
        flex: 1;
        justify-content: center;
    }

    .results-container, .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

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

    .text-controls {
        justify-content: space-between;
    }

    .text-controls .btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .results-container, .stats-grid {
        grid-template-columns: 1fr;
    }

    .conversion-controls {
        flex-direction: column;
    }

    .conversion-controls .btn {
        width: 100%;
        justify-content: center;
    }
}