:root {
    --trex-green: #059669;
    --trex-lime: #a3e635;
    --trex-dark: #022c22;
    --trex-deep: #064e3b;
    --trex-slate: #0c1a14;
    --trex-card: #0f2920;
    --trex-surface: #f0fdf4;
    --trex-text: #e2e8f0;
    --trex-text-dim: #94a3b8;
    --trex-glow: rgba(163, 230, 53, 0.15);
    --trex-glow-strong: rgba(163, 230, 53, 0.25);
}

body {
    background: var(--trex-surface);
    color: var(--text-primary);
}

/* Header capsule styling */
header {
    background: transparent;
    border-bottom: none;
}

nav {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 999px;
    padding: 12px 24px;
    margin: 20px 20px 20px auto;
    width: fit-content;
    border: 1px solid rgba(5, 150, 105, 0.12);
    box-shadow: 0 2px 12px rgba(5, 150, 105, 0.06);
}

.nav-links {
    gap: 24px;
}

.nav-links a {
    color: var(--trex-deep);
    font-weight: 500;
    transition: color 0.2s ease;
    opacity: 0.7;
}

.nav-links a:hover {
    color: var(--trex-green);
    opacity: 1;
}

/* Hero */
.hero {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
}

.hero h1 {
    font-family: 'Lexend', sans-serif;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.5rem;
    font-family: 'Lexend', sans-serif;
    color: var(--trex-green);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero .btn-primary {
    background: var(--trex-dark);
    color: var(--trex-lime);
    border: 1px solid rgba(163, 230, 53, 0.2);
}

.hero .btn-primary:hover {
    background: var(--trex-deep);
    box-shadow: 0 10px 30px rgba(5, 150, 105, 0.2), 0 0 0 1px rgba(163, 230, 53, 0.15);
}

.hero .btn-secondary {
    border-color: var(--trex-green);
    color: var(--trex-dark);
}

.hero .btn-secondary:hover {
    background: var(--trex-dark);
    color: var(--trex-lime);
    border-color: var(--trex-dark);
}

/* Screenshot Section */
.screenshot-section {
    padding: 0 var(--spacing-md) var(--spacing-xl);
}

.screenshot-section h2 {
    font-family: 'Lexend', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    text-align: center;
    letter-spacing: -0.02em;
}

.showcase-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: calc(var(--spacing-xl) * 1.5);
    text-align: center;
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.showcase-item {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(5, 150, 105, 0.08);
}

.showcase-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 36px rgba(5, 150, 105, 0.12);
}

.showcase-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.showcase-item h3 {
    font-family: 'Lexend', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    margin: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    color: var(--text-primary);
}

.showcase-item p {
    margin: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Features — dark section */
.features {
    background: var(--trex-slate);
    max-width: 100%;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 60% 50% at 20% 20%, rgba(163, 230, 53, 0.04) 0%, transparent 70%),
        radial-gradient(ellipse 40% 60% at 80% 80%, rgba(5, 150, 105, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.features h2 {
    font-family: 'Lexend', sans-serif;
    color: #f8fafc;
    text-align: center;
    letter-spacing: -0.02em;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

.feature {
    background: var(--trex-card);
    padding: var(--spacing-lg);
    border-radius: 16px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 1px solid rgba(163, 230, 53, 0.06);
    position: relative;
}

.feature:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(163, 230, 53, 0.1);
    border-color: rgba(163, 230, 53, 0.15);
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--trex-glow);
    border-radius: 14px;
    color: var(--trex-lime);
    transition: background 0.3s ease;
}

.feature:hover .feature-icon {
    background: var(--trex-glow-strong);
}

.feature h3 {
    font-family: 'Lexend', sans-serif;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: #f8fafc;
    font-weight: 600;
}

.feature p {
    color: var(--trex-text-dim);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Usage Guide */
.usage-guide {
    padding: var(--spacing-xl) 0;
}

.usage-guide h2 {
    font-family: 'Lexend', sans-serif;
    letter-spacing: -0.02em;
}

.guide-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.guide-intro p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.guide-steps {
    max-width: 1200px;
    margin: 0 auto;
}

.guide-step {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.guide-step.reverse {
    direction: rtl;
}

.guide-step.reverse > * {
    direction: ltr;
}

.step-content h3 {
    font-family: 'Lexend', sans-serif;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.step-number {
    background: var(--trex-dark);
    color: var(--trex-lime);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.step-content p {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.step-details {
    background: rgba(5, 150, 105, 0.06);
    border-left: 3px solid var(--trex-green);
    padding: var(--spacing-md);
    border-radius: 0 12px 12px 0;
}

.step-details p {
    margin: 0;
    font-size: 1rem;
}

kbd {
    background: var(--trex-dark);
    color: var(--trex-lime);
    border: 1px solid rgba(163, 230, 53, 0.2);
    border-radius: 6px;
    padding: 0.2rem 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.image-placeholder {
    background: linear-gradient(135deg, var(--trex-dark) 0%, var(--trex-deep) 100%);
    border-radius: 16px;
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(163, 230, 53, 0.1);
}

.image-placeholder p {
    margin: 0;
    font-size: 1.25rem;
    color: var(--trex-lime);
    font-family: 'Lexend', sans-serif;
    font-weight: 600;
}

.placeholder-note {
    margin-top: var(--spacing-sm) !important;
    font-size: 0.875rem !important;
    color: var(--trex-text-dim) !important;
    font-weight: 400 !important;
}

/* Developer Tools — dark section */
.developer-tools {
    background: var(--trex-slate);
    max-width: 100%;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.developer-tools::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse 50% 50% at 50% 0%, rgba(5, 150, 105, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.developer-tools h2 {
    font-family: 'Lexend', sans-serif;
    color: #f8fafc;
    text-align: center;
    letter-spacing: -0.02em;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

.tool {
    background: var(--trex-card);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) calc(var(--spacing-md) + 4px);
    border-radius: 12px;
    border-left: 4px solid var(--trex-lime);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tool:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(163, 230, 53, 0.08);
}

.tool h3 {
    font-family: 'Lexend', sans-serif;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: #f8fafc;
}

.tool p {
    color: var(--trex-text-dim);
    font-size: 0.875rem;
}

/* Install Options */
.install-options h2 {
    font-family: 'Lexend', sans-serif;
    letter-spacing: -0.02em;
}

.install-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.install-method {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(5, 150, 105, 0.1);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.install-method:hover {
    box-shadow: 0 8px 24px rgba(5, 150, 105, 0.08);
    border-color: rgba(5, 150, 105, 0.2);
}

.install-method h3 {
    font-family: 'Lexend', sans-serif;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.install-method p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.install-method code {
    display: inline-block;
    background: var(--trex-dark);
    color: var(--trex-lime);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    border: 1px solid rgba(163, 230, 53, 0.15);
}

/* FAQ Section — Accordion */
.faq {
    background: var(--trex-slate);
    max-width: 100%;
    padding: var(--spacing-xl) var(--spacing-md);
}

.faq h2 {
    font-family: 'Lexend', sans-serif;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: #f8fafc;
    letter-spacing: -0.02em;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    background: var(--trex-card);
    border-radius: 12px;
    border: 1px solid rgba(163, 230, 53, 0.06);
    overflow: hidden;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.faq-item[open] {
    box-shadow: 0 4px 20px rgba(163, 230, 53, 0.08);
    border-color: rgba(163, 230, 53, 0.12);
}

.faq-item summary {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
    font-weight: 600;
    color: #f8fafc;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    transition: color 0.2s ease;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "";
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--trex-lime);
    border-bottom: 2px solid var(--trex-lime);
    transform: rotate(45deg);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.faq-item[open] summary::after {
    transform: rotate(-135deg);
}

.faq-item summary:hover {
    color: var(--trex-lime);
}

.faq-item p {
    padding: 0 var(--spacing-lg) var(--spacing-md);
    color: var(--trex-text-dim);
    line-height: 1.6;
    margin: 0;
}

.faq-item a {
    color: var(--trex-lime);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* CTA Section */
.cta {
    text-align: center;
    background: var(--trex-surface);
}

.cta h2 {
    font-family: 'Lexend', sans-serif;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.cta p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.cta .btn-primary {
    background: var(--trex-dark);
    color: var(--trex-lime);
    border: 1px solid rgba(163, 230, 53, 0.2);
}

.cta .btn-primary:hover {
    background: var(--trex-deep);
    box-shadow: 0 10px 30px rgba(5, 150, 105, 0.2), 0 0 0 1px rgba(163, 230, 53, 0.15);
}

.cta .btn-secondary {
    border-color: var(--trex-green);
    color: var(--trex-dark);
}

.cta .btn-secondary:hover {
    background: var(--trex-dark);
    color: var(--trex-lime);
    border-color: var(--trex-dark);
}

/* App logo */
.app-logo {
    width: 120px;
    height: 120px;
    margin-bottom: var(--spacing-md);
    border-radius: 27px;
    box-shadow: 0 10px 40px rgba(5, 150, 105, 0.25), 0 0 0 1px rgba(5, 150, 105, 0.1);
}

/* Footer override for dark sections flow */
footer {
    border-top-color: rgba(5, 150, 105, 0.15);
}

/* Responsive */
@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    nav {
        margin: 10px;
        padding: 10px 20px;
        width: calc(100% - 20px);
        max-width: fit-content;
        margin-left: auto;
    }

    .nav-links {
        gap: 16px;
        font-size: 14px;
    }

    .tagline {
        font-size: 1.25rem;
    }

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

    .guide-step {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .guide-step.reverse {
        direction: ltr;
    }

    .faq-item summary {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }

    .faq-item p {
        padding: 0 var(--spacing-md) var(--spacing-sm);
    }

    .features,
    .developer-tools,
    .faq {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
}