/* ================================================
   ROBOTS ON MOLTBOOK - Techno-Literary Theme
   ================================================ */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg: #0a0a0b;
    --color-bg-elevated: #111113;
    --color-bg-sidebar: #08080a;
    --color-text: #e8e6e3;
    --color-text-muted: #8a8a8a;
    --color-text-dim: #5a5a5a;
    --color-accent: #00ff88;
    --color-accent-dim: rgba(0, 255, 136, 0.15);
    --color-accent-glow: rgba(0, 255, 136, 0.4);
    --color-border: #222225;
    --color-border-light: #333336;

    /* Typography */
    --font-mono: 'Source Sans 3', sans-serif;
    --font-serif: 'Cormorant Garamond', Georgia, serif;

    /* Spacing */
    --sidebar-width: 280px;
    --content-max-width: 720px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

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

/* ================================================
   RESET & BASE
   ================================================ */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-serif);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background-color: var(--color-accent);
    color: var(--color-bg);
}

/* ================================================
   SIDEBAR NAVIGATION
   ================================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--color-bg-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
    color: var(--color-text);
}

.logo .accent {
    color: var(--color-accent);
    text-shadow: 0 0 20px var(--color-accent-glow);
}

.author {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.nav-section {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.nav-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.nav-list {
    list-style: none;
}

.nav-list li {
    margin-bottom: 0.25rem;
}

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-decoration: none;
    padding: 0.6rem 0.75rem;
    display: block;
    border-radius: 6px;
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
}

.nav-link:hover {
    color: var(--color-text);
    background-color: var(--color-accent-dim);
}

.nav-link.active {
    color: var(--color-accent);
    background-color: var(--color-accent-dim);
    border-left-color: var(--color-accent);
}

/* Other Works Links */
.sidebar-works {
    flex-shrink: 0;
    padding: 14px 20px;
    border-top: 1px solid var(--color-border);
}

.works-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 8px;
}

.works-link {
    display: block;
    padding: 3px 0;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.works-link:hover,
.works-link:focus-visible {
    color: var(--color-accent);
}

.works-link:focus-visible {
    outline: 1px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pulse {
    width: 8px;
    height: 8px;
    background-color: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 0 0 0 var(--color-accent-glow);
    }
    50% {
        opacity: 0.6;
        box-shadow: 0 0 0 6px transparent;
    }
}

.status-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-text-dim);
}

/* ================================================
   MOBILE MENU TOGGLE
   ================================================ */

.menu-toggle {
    display: none;
    position: fixed;
    top: 1.25rem;
    left: 1.25rem;
    z-index: 200;
    width: 44px;
    height: 44px;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: all var(--transition-fast);
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    border-color: var(--color-accent);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ================================================
   MAIN CONTENT
   ================================================ */

.content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* ================================================
   HERO SECTION
   ================================================ */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-lg);
    position: relative;
    background:
        radial-gradient(ellipse at 50% 0%, var(--color-accent-dim) 0%, transparent 60%),
        var(--color-bg);
}

.hero-content {
    max-width: 800px;
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
}

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

.hero-meta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.meta-divider {
    color: var(--color-text-dim);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-muted);
    animation: float 3s ease-in-out infinite;
}

.scroll-indicator span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ================================================
   CHAPTER STYLES
   ================================================ */

.chapter {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.chapter-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.chapter-number {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.chapter-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
}

.chapter-subtitle {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-style: italic;
    color: var(--color-text-muted);
}

.chapter-content p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--color-text);
}

.chapter-content em {
    font-style: italic;
    color: var(--color-text);
}

.chapter-content p.emphasis {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-accent);
    text-align: center;
    padding: var(--spacing-md) 0;
}

/* Section Breaks */
.section-break {
    border: none;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-accent) 20%,
        var(--color-accent) 80%,
        transparent
    );
    margin: var(--spacing-lg) 0;
    opacity: 0.4;
}

/* Blockquotes */
.chapter-content blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    font-style: italic;
    color: var(--color-text-muted);
}

/* ================================================
   FOOTER
   ================================================ */

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.footer-text {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.footer-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dim);
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .menu-toggle {
        display: flex;
    }

    .content {
        margin-left: 0;
    }

    .hero {
        padding: var(--spacing-md);
    }

    .chapter {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .chapter-content p {
        font-size: 1.05rem;
    }
}

@media (max-width: 480px) {
    .hero-meta {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .meta-divider {
        display: none;
    }

    .chapter-content p {
        font-size: 1rem;
    }
}

/* ================================================
   SCROLL ANIMATIONS
   ================================================ */

.chapter {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.chapter:nth-child(2) { animation-delay: 0.1s; }
.chapter:nth-child(3) { animation-delay: 0.15s; }
.chapter:nth-child(4) { animation-delay: 0.2s; }

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

/* ================================================
   VOCABULARY & DEFINITIONS
   ================================================ */

.vocab-term {
    border-bottom: 1.5px dotted var(--color-accent);
    cursor: help;
    transition: background-color var(--transition-fast);
    position: relative;
}

.vocab-term:hover,
.vocab-term:focus-visible {
    background-color: var(--color-accent-dim);
}

.vocab-term:focus-visible {
    outline: 1px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Keyboard focus for simplification triggers */
.simplification-trigger:focus-visible {
    opacity: 1;
    transform: scale(1);
    outline: 1px solid var(--color-accent);
    outline-offset: 2px;
}

/* Desktop Popover */
.definition-popover {
    position: absolute;
    z-index: 300;
    width: 280px;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    padding: var(--spacing-sm);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--color-text);
    pointer-events: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.definition-popover.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.definition-title {
    display: block;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.25rem;
}

/* Mobile Bottom Sheet */
.definition-bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-elevated);
    border-top: 2px solid var(--color-accent);
    z-index: 400;
    padding: var(--spacing-md);
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
    transform: translateY(100%);
    transition: transform var(--transition-normal);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.6);
}

.definition-bottom-sheet.open {
    transform: translateY(0);
}

.bottom-sheet-handle {
    width: 40px;
    height: 4px;
    background-color: var(--color-border-light);
    border-radius: 2px;
    margin: 0 auto var(--spacing-md);
}

.bottom-sheet-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--color-text-dim);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* ================================================
   AI SIMPLIFICATION SIDEBAR
   ================================================ */

.para-container {
    position: relative;
    margin-bottom: var(--spacing-md);
    padding-right: 40px; /* Space for the bracket */
    transition: all var(--transition-normal);
}

/* The Green Bracket */
.para-container::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 12px;
    border-right: 2px solid var(--color-accent);
    border-top: 2px solid var(--color-accent);
    border-bottom: 2px solid var(--color-accent);
    opacity: 0;
    transform: translateX(10px);
    transition: all var(--transition-normal);
    pointer-events: none;
}

.para-container:hover::after {
    opacity: 1;
    transform: translateX(0);
}

.simplification-trigger {
    position: absolute;
    right: -10px;
    top: -15px;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 4px;
    cursor: pointer;
    z-index: 20;
    box-shadow: 0 4px 15px rgba(0, 255, 136, 0.2);
    opacity: 0;
    transform: scale(0.9);
    transition: all var(--transition-normal);
    letter-spacing: 0.05em;
}

.para-container:hover .simplification-trigger {
    opacity: 1;
    transform: scale(1);
}

.simplification-trigger:hover {
    background-color: var(--color-accent);
    color: var(--color-bg);
    box-shadow: 0 0 20px var(--color-accent-glow);
}

.simplified-text {
    display: none;
    background-color: var(--color-bg-elevated);
    border-left: 3px solid var(--color-accent);
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0 var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text);
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.4);
}

.para-container.simplified .original-text {
    opacity: 0.25;
    filter: grayscale(1) blur(0.5px);
    transition: all 0.4s ease;
}

.para-container.simplified .simplified-text {
    display: block;
    animation: revealSimple 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes revealSimple {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .para-container {
        padding-right: 0;
    }
    .para-container::after {
        display: none;
    }
    .simplification-trigger {
        position: static;
        display: inline-block;
        margin-bottom: 10px;
        opacity: 1;
        transform: none;
    }
}

/* ================================================
   MARGIN NOTES (Reading Guide)
   ================================================ */

.chapter-content p[data-margin-note],
.chapter-content .para-container[data-margin-note] {
    position: relative;
}

.margin-note {
    position: absolute;
    right: -200px;
    top: 0;
    width: 170px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    line-height: 1.4;
    color: var(--color-text-dim);
    letter-spacing: 0.02em;
    border-left: 1px solid var(--color-border);
    padding-left: 12px;
    opacity: 0;
    transform: translateX(5px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    pointer-events: none;
}

/* Show margin notes when the paragraph is in view */
.margin-note.visible {
    opacity: 1;
    transform: translateX(0);
}

/* On screens where margin notes fit (wide enough) */
@media (min-width: 1200px) {
    .chapter {
        max-width: var(--content-max-width);
        position: relative;
    }
}

/* Hide margin notes on narrower screens */
@media (max-width: 1199px) {
    .margin-note {
        display: none;
    }
}

/* ================================================
   CUSTOM SCROLLBAR
   ================================================ */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-dim);
}

/* ================================================
   PRINT STYLES
   ================================================ */

@media print {
    .sidebar,
    .menu-toggle,
    .scroll-indicator {
        display: none !important;
    }

    .content {
        margin-left: 0;
    }

    .hero {
        min-height: auto;
        padding: 2rem 0;
    }

    .chapter {
        break-inside: avoid;
    }
}