/* ===================================
   TrussC - Landing Page Styles
   =================================== */

/* CSS Variables */
:root {
    /* Colors - Dark Theme */
    --color-bg: #0a0a0b;
    --color-bg-alt: #111113;
    --color-bg-card: #16161a;
    --color-bg-code: #1a1a1f;

    --color-text: #e8e8ed;
    --color-text-muted: #8b8b93;
    --color-text-subtle: #5c5c66;

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;

    --color-accent: #22d3ee;
    --color-accent-alt: #a78bfa;

    --color-border: #27272a;
    --color-border-light: #3f3f46;

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Container */
    --container-max: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===================================
   Navigation
   =================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-text {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.nav-cta {
    padding: var(--space-sm) var(--space-lg) !important;
    background: var(--color-primary);
    color: white !important;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast), transform var(--transition-fast) !important;
}

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

.nav-lang {
    padding: var(--space-xs) var(--space-sm) !important;
    font-size: 0.8rem;
    color: var(--color-text-muted) !important;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast) !important;
}

.nav-lang:hover {
    color: var(--color-text) !important;
    border-color: var(--color-text-muted);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-4xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

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

.hero-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
}

.hero-reading {
    text-transform: none;
    letter-spacing: 0;
    color: var(--color-text-muted);
    font-family: var(--font-sans);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xl);
}

.hero-title-main {
    display: block;
    color: var(--color-text);
}

.hero-title-accent {
    display: block;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.7;
}

.hero-br {
    display: none;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-size: 0.95rem;
    font-weight: 600;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-icon {
    width: 18px;
    height: 18px;
}

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

.btn-primary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-border-light);
    transform: translateY(-2px);
}

.btn-large {
    font-size: 1.05rem;
    padding: var(--space-lg) var(--space-2xl);
}

/* ===================================
   Section Base
   =================================== */
.section {
    padding: var(--space-4xl) 0;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    text-align: center;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-3xl);
}

/* ===================================
   Features Section
   =================================== */
.features {
    background: var(--color-bg-alt);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.feature-card {
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-alt) 100%);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.feature-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ===================================
   Code Section
   =================================== */
.code-section {
    background: var(--color-bg);
}

.code-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.code-tab {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    padding: var(--space-sm) var(--space-lg);
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.code-tab:hover {
    color: var(--color-text);
    border-color: var(--color-border-light);
}

.code-tab.active {
    background: var(--color-bg-code);
    color: var(--color-text);
    border-color: var(--color-primary);
}

.code-container {
    max-width: 800px;
    margin: 0 auto;
}

.code-block {
    display: none;
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.code-block.active {
    display: block;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--color-border);
}

.code-filename {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.code-copy {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    color: var(--color-text-subtle);
    cursor: pointer;
    transition: color var(--transition-fast);
    border-radius: var(--radius-sm);
}

.code-copy:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.05);
}

.code-copy svg {
    width: 16px;
    height: 16px;
}

.code-block pre {
    padding: var(--space-lg);
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
    color: var(--color-text);
}

/* Code Syntax Highlighting */
.code-keyword { color: #c678dd; }
.code-function { color: #61afef; }
.code-string { color: #98c379; }
.code-number { color: #d19a66; }
.code-comment { color: #5c6370; font-style: italic; }
.code-preprocessor { color: #e5c07b; }

/* ===================================
   Tech Stack Section
   =================================== */
.tech-section {
    background: var(--color-bg-alt);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-lg);
}

.tech-card {
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.tech-card:hover {
    border-color: var(--color-border-light);
}

.tech-category {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.tech-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.tech-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.tech-license {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-accent);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(34, 211, 238, 0.1);
    border-radius: var(--radius-sm);
}

/* ===================================
   Comparison Section (For oF Users)
   =================================== */
.comparison-section {
    background: var(--color-bg);
}

.respect-note {
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
    padding: var(--space-xl);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(167, 139, 250, 0.08) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-lg);
    text-align: center;
}

.respect-note p {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.8;
}

.comparison-table-wrapper {
    overflow-x: auto;
    margin-bottom: var(--space-3xl);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.comparison-table th,
.comparison-table td {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
}

.comparison-table td {
    color: var(--color-text-muted);
}

.comparison-table td:last-child {
    color: var(--color-text);
}

.comparison-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.same-badge {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-accent);
    padding: 2px 8px;
    background: rgba(34, 211, 238, 0.15);
    border-radius: var(--radius-sm);
    margin-left: var(--space-sm);
    vertical-align: middle;
}

/* TrussC Benefits */
.trussc-benefits {
    max-width: 900px;
    margin: 0 auto;
}

.trussc-benefits h3 {
    font-size: 1.25rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--color-primary-light);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.benefit-item {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.benefit-item:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
}

.benefit-icon {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    font-size: 1rem;
    color: var(--color-accent);
    background: rgba(34, 211, 238, 0.1);
    border-radius: 50%;
}

.benefit-item strong {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.benefit-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

.comparison-section .guide-link-wrapper {
    display: block;
    width: 100%;
    margin-top: 3rem;
    padding-top: 2rem;
    text-align: center;
}

.comparison-section .guide-link-wrapper .btn {
    display: inline-flex;
    margin: 0 auto;
}

/* ===================================
   Getting Started Section
   =================================== */
.start-section {
    background: var(--color-bg-alt);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.step {
    display: flex;
    gap: var(--space-xl);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary-light);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--color-primary);
    border-radius: 50%;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.step-code {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.step-code code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-accent);
    white-space: pre-wrap;
}

.start-cta {
    text-align: center;
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo-text {
    display: block;
    margin-bottom: var(--space-md);
}

.footer-brand p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
}

.footer-column h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-column a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-text);
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-subtle);
    text-align: center;
}

/* ===================================
   Responsive Design
   =================================== */
@media (min-width: 768px) {
    .hero-br {
        display: block;
    }
}

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

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        gap: 0;
        background: rgba(10, 10, 11, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-md) 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: var(--space-md) var(--space-lg);
    }

    .nav-cta {
        margin: var(--space-md) var(--space-lg) !important;
        text-align: center;
    }

    .hero {
        min-height: auto;
        padding: calc(80px + var(--space-3xl)) 0 var(--space-3xl);
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section {
        padding: var(--space-3xl) 0;
    }

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

    .step {
        flex-direction: column;
        gap: var(--space-md);
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.85rem;
    }

    .respect-note {
        padding: var(--space-lg);
    }

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

    .same-badge {
        display: block;
        margin-left: 0;
        margin-top: var(--space-xs);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-xl);
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.6s ease backwards;
}

.hero-label { animation-delay: 0.1s; }
.hero-title { animation-delay: 0.2s; }
.hero-description { animation-delay: 0.3s; }
.hero-actions { animation-delay: 0.4s; }
.hero-badges { animation-delay: 0.5s; }

/* Scroll animations */
.feature-card,
.tech-card,
.step,
.benefit-item {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.feature-card.visible,
.tech-card.visible,
.step.visible,
.benefit-item.visible {
    opacity: 1;
    transform: translateY(0);
}