/* ==========================================================================
   SIMPLE LAYER ZERO (L0) — DUAL-TONE SWISS CARGO MONOGRAPH
   Screen 1: Pure Matte Black (#000000) Hero with Golden Editorial Indent
   Screen 2: Pure Editorial Paper-White (#FFFFFF) Archive & Reader
   ========================================================================== */

:root {
    --bg-dark: #000000;
    --bg-dark-surface: #0a0a0a;
    --text-dark-primary: #ffffff;
    --text-dark-secondary: #888888;
    --text-dark-muted: #555555;
    --border-dark: #1a1a1a;

    --bg-light: #ffffff;
    --bg-light-surface: #f7f7f5;
    --bg-light-elevated: #eeeeea;
    --text-light-primary: #000000;
    --text-light-secondary: #555555;
    --text-light-muted: #888888;
    --border-light: #e5e5e0;
    --border-light-strong: #000000;

    --accent-green: #00ff66;
    --accent-green-dark: #008f39;
    --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "JetBrains Mono", SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html, body {
    background-color: var(--bg-dark);
    color: var(--text-dark-primary);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.35;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    min-height: 100vh;
}

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

/* --------------------------------------------------------------------------
   SCREEN 1: CARGO HERO SCREEN (Spacious Center-Weighted Margins)
   -------------------------------------------------------------------------- */
.cargo-screen {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 48px 140px 56px;
    max-width: 1680px;
    margin: 0 auto;
    position: relative;
    background-color: var(--bg-dark);
    color: var(--text-dark-primary);
}

@media (min-width: 1440px) {
    .cargo-screen {
        padding: 56px 180px 64px;
    }
}

@media (max-width: 1024px) {
    .cargo-screen {
        padding: 40px 80px 48px;
    }
}

@media (max-width: 768px) {
    .cargo-screen {
        padding: 32px 24px 44px;
    }
}

.cargo-nav {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: baseline;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-dark-secondary);
    width: 100%;
}

.cargo-nav-brand-l0 {
    font-size: 1.45rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--text-dark-primary);
}

.cargo-nav-center {
    display: flex;
    justify-content: center;
    gap: 32px;
}

.cargo-nav-right {
    display: flex;
    gap: 24px;
}

.cargo-nav a:hover {
    color: var(--text-dark-primary);
}

@media (max-width: 768px) {
    .cargo-nav-center {
        display: none;
    }
}

/* Zero-Jitter Centered Fixed Rails */
.cargo-left-rail {
    position: fixed;
    left: 48px;
    top: 50%;
    width: 280px;
    height: 20px;
    margin-left: -140px;
    text-align: center;
    transform: translateY(-50%) rotate(-90deg);
    transform-origin: center center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dark-muted);
    letter-spacing: 0.14em;
    pointer-events: none;
    z-index: 10;
    text-transform: uppercase;
    white-space: nowrap;
    transition: opacity 0.22s ease;
}

.cargo-clock-rail {
    position: fixed;
    right: 48px;
    top: 50%;
    width: 280px;
    height: 20px;
    margin-right: -140px;
    text-align: center;
    transform: translateY(-50%) rotate(90deg);
    transform-origin: center center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dark-muted);
    letter-spacing: 0.08em;
    pointer-events: none;
    z-index: 10;
    white-space: nowrap;
}

@media (max-width: 1024px) {
    .cargo-left-rail,
    .cargo-clock-rail {
        display: none;
    }
}

.cargo-hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    margin: auto 0;
    padding: 60px 0;
}

@media (min-width: 900px) {
    .cargo-hero-grid {
        grid-template-columns: 0.9fr 1.1fr;
        gap: 80px;
        align-items: center;
    }
}

.cargo-hero-title-l0 {
    font-size: clamp(7rem, 20vw, 18rem);
    font-weight: 900;
    line-height: 0.76;
    letter-spacing: -0.075em;
    color: var(--text-dark-primary);
}

.cargo-hero-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cargo-hero-link-item {
    font-size: clamp(2.4rem, 5.5vw, 4.8rem);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.035em;
    color: var(--text-dark-secondary);
    transition: color 0.15s ease, transform 0.15s ease;
    cursor: pointer;
    display: inline-block;
    width: fit-content;
}

.cargo-hero-link-item:hover {
    color: var(--text-dark-primary);
    transform: translateX(8px);
}

.cargo-footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    align-items: end;
}

@media (min-width: 900px) {
    .cargo-footer-grid {
        grid-template-columns: 0.9fr 1.1fr;
        gap: 80px;
    }
}

.cargo-dinamo-card {
    grid-column: 1;
}

@media (min-width: 900px) {
    .cargo-dinamo-card {
        grid-column: 2;
        max-width: 520px;
    }
}

.dinamo-badge {
    display: inline-block;
    background-color: var(--accent-green);
    color: #000000;
    font-family: var(--font-sans);
    font-weight: 900;
    font-size: 1.25rem;
    letter-spacing: -0.04em;
    padding: 6px 16px;
    text-transform: uppercase;
    border-radius: 2px;
    margin-bottom: 14px;
}

.dinamo-text {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-dark-secondary);
}

.dinamo-text a {
    color: var(--text-dark-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* --------------------------------------------------------------------------
   SCREEN 2: PURE EDITORIAL PAPER-WHITE ARCHIVE (#FFFFFF)
   -------------------------------------------------------------------------- */
.specs-section {
    background-color: var(--bg-light);
    color: var(--text-light-primary);
    padding: 100px 0 140px;
    border-top: 1px solid var(--border-light);
    position: relative;
    width: 100%;
}

.specs-container {
    max-width: 1680px;
    margin: 0 auto;
    padding: 0 140px;
}

@media (min-width: 1440px) {
    .specs-container {
        padding: 0 180px;
    }
}

@media (max-width: 1024px) {
    .specs-container {
        padding: 0 80px;
    }
}

@media (max-width: 768px) {
    .specs-container {
        padding: 0 24px;
    }
}

.specs-hero-title {
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 0.95;
    margin-bottom: 24px;
    color: var(--text-light-primary);
}

.specs-subtitle {
    font-size: 1.15rem;
    color: var(--text-light-secondary);
    margin-bottom: 48px;
    max-width: 680px;
    line-height: 1.45;
}

.filter-tab-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-tab {
    background: var(--bg-light-surface);
    border: 1px solid var(--border-light);
    color: var(--text-light-secondary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.15s ease;
}

.filter-tab:hover {
    border-color: var(--border-light-strong);
    color: var(--text-light-primary);
}

.filter-tab.active {
    background: #000000;
    color: #ffffff;
    border-color: #000000;
}

.view-pane {
    display: none;
}

.view-pane.active {
    display: block;
}

.specs-monolithic-list {
    display: flex;
    flex-direction: column;
    border-top: 2px solid var(--border-light-strong);
}

.spec-line-item {
    font-size: clamp(1.6rem, 3.8vw, 3.4rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.035em;
    color: var(--text-light-primary);
    padding: 22px 0;
    border-bottom: 1px solid var(--border-light);
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    transition: all 0.18s ease;
    cursor: pointer;
}

.spec-line-item:hover {
    color: var(--accent-green-dark);
    padding-left: 20px;
    background-color: var(--bg-light-surface);
}

.spec-line-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-light-muted);
    letter-spacing: 0;
}

/* --------------------------------------------------------------------------
   IN-PAGE RFC READER
   -------------------------------------------------------------------------- */
.rfc-reader-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    justify-content: flex-end;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.rfc-reader-overlay.open {
    display: flex;
    opacity: 1;
}

.rfc-reader-pane {
    background: var(--bg-light);
    color: var(--text-light-primary);
    border-left: 1px solid var(--border-light);
    width: min(940px, 100vw);
    height: 100vh;
    overflow-y: auto;
    padding: 48px 56px 80px;
    display: flex;
    flex-direction: column;
    box-shadow: -20px 0 80px rgba(0,0,0,0.25);
}

@media (max-width: 768px) {
    .rfc-reader-pane {
        padding: 32px 24px 60px;
    }
}

.rfc-reader-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-bottom: 2px solid var(--border-light-strong);
    padding-bottom: 24px;
    margin-bottom: 36px;
}

.rfc-reader-kicker {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-green-dark);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.rfc-close-btn {
    background: transparent;
    border: 1px solid var(--border-light-strong);
    color: var(--text-light-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.rfc-close-btn:hover {
    background: var(--text-light-primary);
    color: var(--bg-light);
}

.rfc-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.035em;
    line-height: 1.05;
    margin-bottom: 24px;
    color: var(--text-light-primary);
}

.rfc-content h3 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 36px 0 16px;
    color: var(--text-light-primary);
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 8px;
}

.rfc-content p {
    font-size: 1.05rem;
    line-height: 1.65;
    color: #222222;
    margin-bottom: 20px;
}

.rfc-content pre {
    background: #111111;
    color: #f0f0f0;
    border-radius: 2px;
    padding: 22px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-x: auto;
    margin: 24px 0 32px;
}

.rfc-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--bg-light-surface);
    color: #111111;
    padding: 2px 6px;
    border-radius: 2px;
    border: 1px solid var(--border-light);
}

.rfc-content pre code {
    background: transparent;
    color: inherit;
    border: none;
    padding: 0;
}

.rfc-content ul {
    list-style: square;
    padding-left: 24px;
    margin-bottom: 24px;
    color: #222222;
}

.rfc-content li {
    margin-bottom: 10px;
    font-size: 1.02rem;
    line-height: 1.55;
}