/* ===================================
   CSS Variables & Reset
   Variables moved to themes.css
   =================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--space-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

code {
    font-family: var(--font-mono);
    background-color: var(--color-bg-light);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

kbd {
    font-family: var(--font-mono);
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.125rem 0.5rem;
    font-size: 0.875em;
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.2);
}

/* ===================================
   Layout & Container
   =================================== */

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

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

.section-title {
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
    font-weight: 600;
    letter-spacing: -0.02em;
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

/* ===================================
   Navigation
   =================================== */

.nav {
    background-color: var(--color-bg-darker);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 700;
    font-size: 1.125rem;
}

.brand-icon {
    color: var(--color-primary);
    flex-shrink: 0;
}

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

.nav-link {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

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

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

/* ===================================
   Hero Section
   =================================== */

.hero {
    padding: var(--space-3xl) 0;
    background: linear-gradient(180deg, var(--color-bg-darker) 0%, var(--color-bg-dark) 100%);
}

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

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--space-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-xl);
}

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

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

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

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background-color: rgba(var(--color-primary), 0.05);
}

/* ===================================
   Problem Section
   =================================== */

.section-problem {
    background-color: var(--color-bg-darker);
}

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

.problem-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    transition: all var(--transition-base);
}

.problem-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.problem-icon {
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    stroke-width: 1.5;
}

.problem-card h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.problem-card p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.problem-example {
    background-color: var(--color-bg-light);
    border-left: 4px solid var(--color-warning);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
}

.example-question {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    font-style: italic;
    margin: 0;
}

/* ===================================
   Solution Section
   =================================== */

.solution-value {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
}

.value-prop {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

.value-prop:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.value-icon {
    color: var(--color-primary);
    flex-shrink: 0;
    stroke-width: 1.5;
}

.value-prop h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.value-prop p {
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===================================
   Demo Section
   =================================== */

.section-demo {
    background-color: var(--color-bg-darker);
}

.demo-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.demo-image {
    width: 100%;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.demo-caption {
    margin-top: var(--space-md);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ===================================
   Features Section
   =================================== */

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

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

.feature-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    stroke-width: 1.5;
}

.feature-card h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===================================
   Workflow Section
   =================================== */

.section-workflow {
    background-color: var(--color-bg-darker);
}

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.workflow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-md);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.step-content h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.step-content p {
    color: var(--color-text-secondary);
    margin: 0;
}

.workflow-tip {
    background-color: var(--color-bg-light);
    border-left: 4px solid var(--color-primary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.workflow-tip strong {
    color: var(--color-primary);
}

/* ===================================
   Installation Section
   =================================== */

.install-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.install-method h3,
.install-usage h3,
.keybindings h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

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

.code-block code {
    background: none;
    padding: 0;
    color: var(--color-primary);
    font-size: 0.875rem;
    display: block;
}

.copy-btn {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    background-color: var(--color-bg-light);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background-color: var(--color-primary);
    color: var(--color-bg-dark);
    border-color: var(--color-primary);
}

.copy-btn.copied {
    background-color: var(--color-primary);
    color: var(--color-bg-dark);
}

.install-note {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: var(--space-sm);
}

.usage-commands {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.command-example {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

.command-example code {
    color: var(--color-primary);
    font-size: 1rem;
}

.command-desc {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.keybindings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--space-md);
}

.keybinding {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
}

.keybinding kbd {
    flex-shrink: 0;
}

.keybinding span {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* ===================================
   Community Section
   =================================== */

.section-community {
    background-color: var(--color-bg-darker);
}

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

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

.community-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.separator {
    color: var(--color-text-muted);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background-color: var(--color-bg-darker);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

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

.footer-credit,
.footer-tech {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

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

.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    :root {
        --space-3xl: 3rem;
    }

    .nav-links {
        gap: var(--space-md);
        font-size: 0.875rem;
    }

    .nav-link span {
        display: none;
    }

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

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

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

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

    .workflow-steps {
        grid-template-columns: 1fr;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }

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

    .command-example {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
}

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

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .nav-container {
        padding: var(--space-sm) var(--space-md);
    }
}

/* ===================================
   Animations
   =================================== */

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

.section {
    animation: fadeInUp 0.6s ease;
}