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

:root {
    --primary-color: #0f7ed6;
    --secondary-color: #f7feff;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(15, 126, 214, 0.1);
    --shadow-hover: 0 4px 20px rgba(15, 126, 214, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--secondary-color);
}

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

.header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo a {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.logo a:hover {
    opacity: 0.8;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-list a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 5px 0;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 3px;
}

.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--white) 100%);
    padding: 100px 0 80px;
    text-align: center;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--text-dark);
    font-weight: 700;
}

.hero-content p {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: #0d6ab8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

.tool-section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.section-header p {
    font-size: 18px;
    color: var(--text-light);
}

.tool-tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.tool-tab {
    padding: 12px 30px;
    background-color: var(--white);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tool-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tool-tab.active {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.tool-panel {
    display: none;
}

.tool-panel.active {
    display: block;
}

.tool-card {
    background-color: var(--white);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 900px;
    margin: 0 auto;
}

.tool-card h3 {
    font-size: 28px;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.tool-card > p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.canvas-wrapper {
    border: 2px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 25px;
    background-color: var(--white);
    display: flex;
    justify-content: center;
    overflow: hidden;
}

#signatureCanvas {
    display: block;
    cursor: crosshair;
    touch-action: none;
    max-width: 100%;
    height: auto;
}

.tool-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group input[type="range"] {
    width: calc(100% - 60px);
    margin-right: 10px;
}

.form-group input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

#fontSizeValue {
    font-weight: 600;
    color: var(--primary-color);
}

.signature-preview {
    background-color: var(--secondary-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    margin: 30px 0;
    text-align: center;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#signaturePreview {
    font-size: 60px;
    font-family: 'Brush Script MT', cursive;
    color: #000000;
    word-wrap: break-word;
    max-width: 100%;
}

.features {
    padding: 80px 0;
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background-color: var(--secondary-color);
    padding: 35px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

.faq {
    padding: 80px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white);
    border-radius: 12px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    padding: 20px 25px;
    background: none;
    border: none;
    text-align: left;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: var(--secondary-color);
}

.faq-icon {
    font-size: 24px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 25px 20px 25px;
    color: var(--text-light);
    line-height: 1.7;
}

.footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 40px 0;
    margin-top: 80px;
}

.footer-content {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-copyright {
    color: #999;
    font-size: 14px;
}

.page-hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--white) 100%);
    padding: 80px 0 60px;
    text-align: center;
}

.page-hero h1 {
    font-size: 42px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.page-hero p {
    font-size: 18px;
    color: var(--text-light);
}

.page-content {
    padding: 60px 0;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.content-section {
    background-color: var(--white);
    padding: 35px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.content-section h2 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-section h3 {
    font-size: 22px;
    margin-bottom: 15px;
    margin-top: 20px;
    color: var(--text-dark);
}

.content-section p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.content-section a {
    color: var(--primary-color);
    text-decoration: none;
}

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

.content-list {
    margin: 20px 0;
    padding-left: 25px;
}

.content-list li {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 10px;
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
}

.contact-info {
    background-color: var(--white);
    padding: 35px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.contact-info h2 {
    font-size: 28px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.contact-info p {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 25px;
}

.contact-details {
    margin-top: 30px;
}

.contact-detail-item {
    margin-bottom: 25px;
}

.contact-detail-item h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-detail-item p {
    color: var(--text-light);
    margin: 0;
}

.contact-form-container {
    background-color: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.contact-form .form-group {
    margin-bottom: 25px;
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.error-message {
    display: block;
    color: #d32f2f;
    font-size: 14px;
    margin-top: 5px;
    min-height: 20px;
}

.success-message {
    display: none;
    background-color: #4caf50;
    color: var(--white);
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: center;
}

.success-message.show {
    display: block;
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 60px);
        background-color: var(--white);
        transition: left 0.3s ease;
        box-shadow: var(--shadow);
    }

    .nav.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        padding: 30px;
        gap: 0;
    }

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

    .nav-list a {
        display: block;
        padding: 15px 0;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .tool-tabs {
        flex-direction: column;
        gap: 10px;
    }

    .tool-card {
        padding: 25px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    #signatureCanvas {
        width: 100%;
    }

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

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .contact-form-container {
        padding: 25px;
    }

    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 60px 0 40px;
    }

    .hero-content h1 {
        font-size: 26px;
    }

    .tool-section,
    .features,
    .faq,
    .page-content {
        padding: 40px 0;
    }

    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .tool-card h3 {
        font-size: 22px;
    }

    #signaturePreview {
        font-size: 40px;
    }
}