/* ============================================
   ChainlessChain Website Styles
   ============================================ */

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

:root {
    /* Colors */
    --primary-color: #1890ff;
    --primary-dark: #096dd9;
    --secondary-color: #52c41a;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --bg-white: #ffffff;
    --bg-light: #f5f7fa;
    --bg-dark: #1a1a2e;
    --border-color: #e1e8ed;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);

    /* Spacing */
    --container-width: 1200px;
    --section-padding: 100px 0;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    padding: 8px 0;
    box-shadow: var(--shadow-hover);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-image {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-text-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 32px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

.btn-outline {
    padding: 8px 20px;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.btn-primary {
    padding: 10px 25px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.hero-gradient {
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    opacity: 0.1;
}

.hero-content {
    text-align: center;
    padding: 50px 0;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.hero-title .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
}

.btn-hero {
    padding: 15px 40px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

.btn-hero-outline {
    padding: 15px 40px;
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 30px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-hero-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 1s ease-out 0.3s backwards;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.6s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Section Headers
   ============================================ */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
}

/* ============================================
   Products Section
   ============================================ */
.products {
    padding: var(--section-padding);
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.product-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
}

.product-card.featured {
    border: 2px solid var(--primary-color);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--gradient-primary);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

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

.product-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.product-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.product-features {
    list-style: none;
    margin-bottom: 30px;
}

.product-features li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 14px;
}

.btn-product {
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-product:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--section-padding);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-item {
    text-align: center;
    padding: 30px;
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-item p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   Technology Stack
   ============================================ */
.tech-stack {
    padding: var(--section-padding);
    background: var(--bg-light);
}

.tech-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.tech-category {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.tech-category h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    padding: 8px 16px;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* ============================================
   Download Section
   ============================================ */
.download {
    padding: var(--section-padding);
    background: var(--bg-light);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.download-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
}

.download-card.featured {
    background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
    border: 2px solid var(--primary-color);
}

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

.download-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.download-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
}

.download-version {
    color: var(--primary-color);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.btn-download {
    display: inline-block;
    width: 100%;
    padding: 14px 30px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.btn-download.disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-download.disabled:hover {
    transform: none;
    box-shadow: none;
}

.btn-download-outline {
    display: inline-block;
    width: 100%;
    padding: 14px 30px;
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-download-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.source-links {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 20px;
}

.source-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 14px;
    transition: all 0.3s ease;
}

.source-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.source-icon {
    font-size: 18px;
}

.download-notice {
    background: white;
    padding: 20px 30px;
    border-radius: 15px;
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow);
}

.download-notice p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

.download-notice a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.download-notice a:hover {
    text-decoration: underline;
}

/* ============================================
   Scenarios Section
   ============================================ */
.scenarios {
    padding: var(--section-padding);
}

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

.scenario-card {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s ease;
}

.scenario-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

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

.scenario-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.scenario-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   About Section
   ============================================ */
.about {
    padding: var(--section-padding);
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 16px;
}

.about-features {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-feature {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.about-feature-icon {
    font-size: 32px;
}

.about-feature h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.about-feature p {
    color: var(--text-secondary);
    font-size: 14px;
}

.about-stats-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-hover);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    padding: var(--section-padding);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h3,
.contact-form h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 32px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.contact-item p,
.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
}

.contact-item a:hover {
    color: var(--primary-color);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    padding: 10px 20px;
    background: var(--bg-light);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-family: inherit;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: 15px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    font-size: 24px;
    font-weight: 700;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 15px;
}

.footer-company {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    font-weight: 500;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
    margin-bottom: 5px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 968px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }

    .products-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
    }

    .about-content,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-hero,
    .btn-hero-outline {
        width: 100%;
    }

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

@media (max-width: 640px) {
    .section-title {
        font-size: 32px;
    }

    .hero-title {
        font-size: 28px;
    }

    .product-card,
    .scenario-card {
        padding: 30px;
    }

    .container {
        padding: 0 15px;
    }

    .nav-actions {
        gap: 10px;
    }

    .btn-outline {
        padding: 6px 15px;
        font-size: 14px;
    }

    .source-links {
        flex-direction: column;
    }

    .source-link {
        width: 100%;
        justify-content: center;
    }
}