/* ========================================
   Follow the Watts
   Hybrid Editorial/Analytical Design System
   ======================================== */

:root {
    /* Colors - Light mode: warm but neutralized */
    --color-bg: #F5F6F4;
    --color-bg-warm: #ECEEE9;
    --color-bg-alt: #E3E6E0;
    --color-text: #1A1D1A;
    --color-text-secondary: #4A524A;
    --color-text-tertiary: #6B756B;
    --color-accent: #2B5470;
    --color-accent-light: #3A6D8A;
    --color-accent-muted: rgba(43, 84, 112, 0.08);
    --color-border: #D0D4CC;
    --color-border-dark: #B8BEB2;
    
    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Source Serif 4', Georgia, serif;
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;
    --space-xl: 5rem;
    --space-2xl: 7rem;
    
    /* Layout */
    --max-width-narrow: 600px;
    --max-width-content: 820px;
    --max-width-wide: 1200px;
    
    /* Transitions */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --duration-fast: 0.2s;
    --duration-medium: 0.4s;
    --duration-slow: 0.8s;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #101412;
        --color-bg-warm: #181C19;
        --color-bg-alt: #1E2420;
        --color-text: #E4E8E4;
        --color-text-secondary: #9AA59A;
        --color-text-tertiary: #7A857A;
        --color-accent: #6BA3C9;
        --color-accent-light: #8DBDE0;
        --color-accent-muted: rgba(107, 163, 201, 0.1);
        --color-border: #2A322A;
        --color-border-dark: #3A443A;
    }
    
    .grain-overlay {
        opacity: 0.012;
    }
}

/* Manual dark mode toggle support */
[data-theme="dark"] {
    --color-bg: #101412;
    --color-bg-warm: #181C19;
    --color-bg-alt: #1E2420;
    --color-text: #E4E8E4;
    --color-text-secondary: #9AA59A;
    --color-text-tertiary: #7A857A;
    --color-accent: #6BA3C9;
    --color-accent-light: #8DBDE0;
    --color-accent-muted: rgba(107, 163, 201, 0.1);
    --color-border: #2A322A;
    --color-border-dark: #3A443A;
}

[data-theme="dark"] .grain-overlay {
    opacity: 0.012;
}

[data-theme="light"] {
    --color-bg: #F5F6F4;
    --color-bg-warm: #ECEEE9;
    --color-bg-alt: #E3E6E0;
    --color-text: #1A1D1A;
    --color-text-secondary: #4A524A;
    --color-text-tertiary: #6B756B;
    --color-accent: #2B5470;
    --color-accent-light: #3A6D8A;
    --color-accent-muted: rgba(43, 84, 112, 0.08);
    --color-border: #D0D4CC;
    --color-border-dark: #B8BEB2;
}

/* ========================================
   Reset & Base
   ======================================== */

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

html {
    font-size: 18px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

/* Grain overlay - reduced for analytical feel */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.02;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ========================================
   Site Header
   ======================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0.6rem var(--space-lg);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.header-label {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-secondary);
}

.header-updated {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
}

/* ========================================
   Landing Page - Hero
   ======================================== */

.landing-main {
    position: relative;
}

.hero {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-xl) var(--space-lg);
    position: relative;
}

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

.hero-icon {
    width: 80px;
    height: 56px;
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeIn 0.9s var(--ease-out-quad) 0.1s forwards;
}

.hero-icon .icon-line {
    stroke-dasharray: 80;
    stroke-dashoffset: 80;
    animation: drawLine 0.8s var(--ease-out-expo) forwards;
}

.hero-icon .icon-line:nth-child(1) {
    animation-delay: 0.2s;
}

.hero-icon .icon-line:nth-child(2) {
    animation-delay: 0.35s;
}

.hero-icon .icon-line:nth-child(3) {
    animation-delay: 0.5s;
}

.hero-icon .icon-connector {
    stroke-dasharray: 24;
    stroke-dashoffset: 24;
    animation: drawLine 0.5s var(--ease-out-expo) forwards;
}

.hero-icon .icon-connector:nth-child(4) {
    animation-delay: 0.55s;
}

.hero-icon .icon-connector:nth-child(5) {
    animation-delay: 0.7s;
}

@keyframes drawLine {
    to {
        stroke-dashoffset: 0;
    }
}

.hero-accent-line {
    width: 120px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    margin: var(--space-md) auto 0;
    border-radius: 2px;
    opacity: 0;
    transform: scaleX(0);
    animation: expandLine 0.6s var(--ease-out-expo) 0.7s forwards;
}

@keyframes expandLine {
    to {
        opacity: 1;
        transform: scaleX(1);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 7.5rem);
    font-weight: 400;
    line-height: 0.95;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.title-line {
    display: block;
    opacity: 0;
    transform: translateY(30px);
    animation: revealUp 0.9s var(--ease-out-expo) forwards;
}

.title-line:nth-child(1) {
    animation-delay: 0.15s;
}

.title-line:nth-child(2) {
    animation-delay: 0.28s;
}

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

.hero-subtitle {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    opacity: 0;
    animation: fadeIn 0.9s var(--ease-out-quad) 0.5s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

/* ========================================
   Landing Page - TL;DR Section
   ======================================== */

.tldr-section {
    padding: var(--space-lg) var(--space-lg);
    background: var(--color-bg-warm);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.tldr-inner {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.tldr-label {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.tldr-content {
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--color-text);
}

@media (max-width: 768px) {
    .tldr-section {
        padding: var(--space-lg) var(--space-md);
    }
    
    .tldr-content {
        font-size: 1rem;
    }
}

/* ========================================
   Landing Page - Section Dividers
   ======================================== */

.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-sm);
}

.divider-line {
    width: 60px;
    height: 1px;
    background: var(--color-border);
    transform: scaleX(0);
    transition: transform 0.6s var(--ease-out-expo);
}

.section-divider.visible .divider-line {
    transform: scaleX(1);
}

.divider-line:first-child {
    transform-origin: right center;
}

.divider-line:last-child {
    transform-origin: left center;
}

.divider-node {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent);
    opacity: 0;
    transform: scale(0);
    transition: opacity 0.4s var(--ease-out-quad) 0.3s, 
                transform 0.4s var(--ease-out-expo) 0.3s;
}

.section-divider.visible .divider-node {
    opacity: 0.4;
    transform: scale(1);
}

/* ========================================
   Landing Page - Premise Sections
   ======================================== */

.premises-container {
    position: relative;
}

.premise-connector {
    position: absolute;
    left: 50%;
    top: var(--space-lg);
    bottom: var(--space-lg);
    width: 1px;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--color-border-dark) 10%,
        var(--color-border-dark) 90%,
        transparent 100%
    );
    transform: translateX(-50%);
    opacity: 0.5;
    z-index: 0;
}

/* Position connector at the premise number column on larger screens */
@media (min-width: 769px) {
    .premise-connector {
        left: calc(50% - var(--max-width-content) / 2 + 30px);
        transform: none;
    }
}

.premise {
    padding: var(--space-lg) var(--space-lg);
    border-top: 1px solid var(--color-border);
    position: relative;
    z-index: 1;
}

.premise:first-of-type {
    border-top: none;
}

.premise-inner {
    max-width: var(--max-width-content);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--space-md);
}

.premise-number {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    padding-top: 0.5rem;
    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

.premise-number span {
    position: relative;
    z-index: 2;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    background-color: #faf9f7;
    transition: border-color 0.3s var(--ease-out-quad),
                background-color 0.3s var(--ease-out-quad);
}

[data-theme="dark"] .premise-number span {
    background-color: #1a1a1a;
}

.premise.visible .premise-number span {
    border-color: var(--color-accent);
    background-color: #e8edf1;
}

[data-theme="dark"] .premise.visible .premise-number span {
    background-color: #1e2a32;
}

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

.premise-content p:last-child {
    margin-bottom: 0;
}

.premise-lead {
    font-size: 1.4rem;
    line-height: 1.5;
    margin-bottom: var(--space-md) !important;
}

/* Premise content */
.premise-content {
    position: relative;
}

/* ========================================
   Section Diagrams - Tufte Style
   ======================================== */

.section-diagram {
    margin: 2.5em 0;
    padding: 2em 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section-diagram.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-diagram svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
}

.section-diagram text {
    font-family: var(--font-mono);
    fill: var(--color-text-secondary);
}

.section-diagram .diagram-label {
    font-size: 11px;
    letter-spacing: 0.05em;
}

.section-diagram .diagram-value {
    font-size: 13px;
    font-weight: 500;
    fill: var(--color-text);
}

.section-diagram .diagram-title {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    fill: var(--color-text-tertiary);
}

.section-diagram .diagram-line {
    stroke: var(--color-border-dark);
    stroke-width: 1;
}

.section-diagram .diagram-line-accent {
    stroke: var(--color-accent);
    stroke-width: 1.5;
}

.section-diagram .diagram-fill-hollow {
    fill: none;
    stroke: var(--color-text-tertiary);
    stroke-width: 1.5;
}

.section-diagram .diagram-fill-solid {
    fill: var(--color-accent);
    opacity: 0.15;
    stroke: var(--color-accent);
    stroke-width: 1.5;
}

.section-diagram .diagram-fill-hatched {
    fill: url(#hatch-pattern);
    stroke: var(--color-accent);
    stroke-width: 1.5;
}

.section-diagram .diagram-node {
    fill: var(--color-bg);
    stroke: var(--color-accent);
    stroke-width: 1.5;
}

.section-diagram .diagram-node-text {
    font-size: 12px;
    fill: var(--color-text);
    text-anchor: middle;
}

.section-diagram .diagram-arrow {
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 1;
    opacity: 0.6;
}

/* Flywheel animation */
@keyframes flywheel-pulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

.section-diagram .flywheel-segment {
    animation: flywheel-pulse 3s ease-in-out infinite;
}

.section-diagram .flywheel-segment:nth-child(2) { animation-delay: 0.75s; }
.section-diagram .flywheel-segment:nth-child(3) { animation-delay: 1.5s; }
.section-diagram .flywheel-segment:nth-child(4) { animation-delay: 2.25s; }

/* Three layers cascade animation */
@keyframes cascade-flow {
    0% { opacity: 0; transform: translateY(-4px); }
    20% { opacity: 1; transform: translateY(0); }
    80% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(4px); }
}

.section-diagram .cascade-arrow {
    animation: cascade-flow 2.5s ease-in-out infinite;
}

.section-diagram .cascade-arrow:nth-child(2) { animation-delay: 0.8s; }

/* Map highlights */
.section-diagram .map-dot {
    fill: var(--color-text-tertiary);
    opacity: 0.3;
}

.section-diagram .map-highlight-congested {
    fill: #c0392b;
    opacity: 0.8;
}

.section-diagram .map-highlight-available {
    fill: var(--color-accent);
    opacity: 0.8;
}

.section-diagram .map-highlight-queue {
    fill: #d4a017;
    opacity: 0.8;
}

/* Scroll animations - reduced travel distance */
[data-animate] {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity var(--duration-slow) var(--ease-out-quad),
                transform var(--duration-slow) var(--ease-out-quad);
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Landing Page - CTA Section
   ======================================== */

.cta-section {
    padding: var(--space-lg) var(--space-lg);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.cta-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-text);
    transition: gap var(--duration-fast) var(--ease-out-quad),
                border-color var(--duration-fast) ease;
}

.cta-primary:hover {
    gap: calc(var(--space-sm) + 0.5rem);
    border-color: var(--color-accent);
}

.cta-primary:hover .cta-text {
    color: var(--color-accent);
}

.cta-text {
    transition: color var(--duration-fast) ease;
}

.cta-arrow {
    font-family: var(--font-ui);
    transition: transform var(--duration-fast) var(--ease-out-quad);
}

.cta-primary:hover .cta-arrow {
    transform: translateX(4px);
}

/* ========================================
   Frameworks Section
   ======================================== */

.frameworks-section {
    padding: var(--space-xl) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.frameworks-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.frameworks-header {
    margin-bottom: var(--space-lg);
}

.section-label {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-tertiary);
}

.frameworks-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--color-border);
}

.framework-card {
    background: var(--color-bg);
    padding: var(--space-md) var(--space-lg);
    text-decoration: none;
    transition: background-color var(--duration-fast) ease;
}

.framework-card:hover {
    background: var(--color-bg-warm);
}

.framework-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.framework-desc {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

@media (max-width: 900px) {
    .frameworks-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Operators Section
   ======================================== */

.operators-section {
    padding: var(--space-lg) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.operators-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.operators-header {
    margin-bottom: var(--space-md);
}

.operators-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

/* Center last card when odd number of operators */
.operators-grid .operator-card:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: calc(50% - var(--space-sm) / 2);
    justify-self: center;
}

.operator-card {
    background: var(--color-bg-warm);
    border: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    text-decoration: none;
    transition: border-color var(--duration-fast) ease,
                background-color var(--duration-fast) ease;
}

.operator-card:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-muted);
}

.operator-ticker {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: var(--space-xs);
}

.operator-thesis {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.operator-thesis .figure {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text);
}

@media (max-width: 700px) {
    .operators-grid {
        grid-template-columns: 1fr;
    }
    
    .operators-grid .operator-card:last-child:nth-child(odd) {
        max-width: none;
        justify-self: stretch;
    }
}

/* ========================================
   Table of Contents
   ======================================== */

.toc-section {
    padding: var(--space-lg) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    max-width: var(--max-width-wide);
    margin: 0 auto var(--space-lg);
}

.toc-label {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-tertiary);
}

.toc-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.toc-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-lg) var(--space-xl);
    max-width: var(--max-width-wide);
    margin: 0 auto;
    counter-reset: section;
}

/* First row: 3 items, each spanning 2 columns */
.toc-grid .toc-part:nth-child(1) { grid-column: 1 / 3; }
.toc-grid .toc-part:nth-child(2) { grid-column: 3 / 5; }
.toc-grid .toc-part:nth-child(3) { grid-column: 5 / 7; }

/* Second row: 2 items, centered by offsetting */
.toc-grid .toc-part:nth-child(4) { grid-column: 2 / 4; }
.toc-grid .toc-part:nth-child(5) { grid-column: 4 / 6; }

@media (max-width: 900px) {
    .toc-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .toc-grid .toc-part:nth-child(1),
    .toc-grid .toc-part:nth-child(2),
    .toc-grid .toc-part:nth-child(3),
    .toc-grid .toc-part:nth-child(4),
    .toc-grid .toc-part:nth-child(5) {
        grid-column: auto;
    }
}

@media (max-width: 600px) {
    .toc-grid {
        grid-template-columns: 1fr;
    }
}

.toc-part {
    padding-bottom: var(--space-md);
}

.toc-part-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

.toc-part-number {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--color-text-tertiary);
}

.toc-part-title {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
}

.toc-sections {
    list-style: none;
}

.toc-sections li {
    padding: var(--space-xs) 0;
}

.toc-sections a {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.toc-sections a::before {
    content: counter(section) ".";
    counter-increment: section;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    min-width: 1.5rem;
}

.toc-sections a:hover {
    color: var(--color-accent);
}

.toc-sections a.read::after {
    content: "✓";
    margin-left: 0.5rem;
    color: var(--color-accent);
    font-size: 0.75rem;
}

.toc-ticker {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.03em;
}

/* ========================================
   About Section
   ======================================== */

.about-section {
    padding: var(--space-lg) var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.about-inner {
    display: block;
    max-width: var(--max-width-content);
    margin: 0 auto;
    width: 100%;
}

.about-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 400;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.about-content {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.about-content p {
    margin-bottom: 1.25em;
}

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content strong {
    color: var(--color-text);
    font-weight: 500;
}

.source-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    max-width: 100%;
    padding: var(--space-md) var(--space-lg);
    margin-top: var(--space-lg);
    background: var(--color-bg-warm);
    border: 1px solid var(--color-border);
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    box-sizing: border-box;
}

.source-badge svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

/* ========================================
   Closing Section
   ======================================== */

.closing {
    padding: var(--space-lg) var(--space-lg);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.closing-statement {
    font-family: var(--font-body);
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: var(--max-width-narrow);
    margin: 0 auto var(--space-lg);
    line-height: 1.7;
}

.closing-cta {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    text-decoration: none;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration-fast) ease;
}

.closing-cta:hover {
    border-color: var(--color-accent);
}

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

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

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

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

.footer-icon {
    color: var(--color-text-tertiary);
}

.footer-updated {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--color-text-tertiary);
    letter-spacing: 0.02em;
}

.footer-right {
    display: flex;
    gap: var(--space-lg);
}

.footer-link {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
}

.footer-link:hover {
    color: var(--color-text-secondary);
}

/* ========================================
   Theme Toggle
   ======================================== */

.theme-toggle {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-bg-warm);
    border: 1px solid var(--color-border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--duration-fast) ease,
                border-color var(--duration-fast) ease;
    z-index: 50;
}

.theme-toggle:hover {
    background: var(--color-bg-alt);
    border-color: var(--color-border-dark);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
}

.theme-toggle .icon-sun {
    display: none;
}

.theme-toggle .icon-moon {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    .theme-toggle .icon-sun {
        display: block;
    }
    
    .theme-toggle .icon-moon {
        display: none;
    }
}

/* ========================================
   Responsive - Landing Page
   ======================================== */

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    /* Consistent horizontal padding across all landing sections */
    .site-header {
        padding: 0.6rem var(--space-md);
    }
    
    .hero {
        min-height: 70vh;
        padding: var(--space-lg) var(--space-md);
    }
    
    .section-divider {
        padding: var(--space-sm) var(--space-md);
    }
    
    .divider-line {
        width: 40px;
    }
    
    .premise-connector {
        display: none;
    }
    
    .premise {
        padding: var(--space-md) var(--space-md);
    }
    
    .premise-inner {
        grid-template-columns: 40px 1fr;
        gap: var(--space-sm);
    }
    
    .premise-number span {
        width: 32px;
        height: 32px;
        font-size: 0.65rem;
    }
    
    .premise-lead {
        font-size: 1.25rem;
    }
    
    .frameworks-section,
    .operators-section,
    .toc-section,
    .about-section,
    .cta-section {
        padding: var(--space-md) var(--space-md);
    }
    
    .closing {
        padding: var(--space-md) var(--space-md);
    }
    
    .site-footer {
        padding: var(--space-lg) var(--space-md);
    }
    
    .footer-inner {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .footer-left {
        order: 2;
    }
    
    .footer-right {
        order: 1;
        gap: var(--space-md);
    }
    
    .framework-card {
        padding: var(--space-md);
    }
    
    .operator-card {
        padding: var(--space-md);
    }
    
    .about-inner {
        padding: 0;
    }
    
    .theme-toggle {
        bottom: var(--space-md);
        right: var(--space-md);
    }
}

/* Small mobile refinements */
@media (max-width: 480px) {
    .hero-title {
        font-size: clamp(2.5rem, 12vw, 3.5rem);
    }
    
    .hero-icon {
        width: 60px;
        height: 42px;
        margin-bottom: var(--space-sm);
    }
    
    .hero-accent-line {
        width: 80px;
    }
    
    .premise-inner {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }
    
    .premise-number {
        padding-top: 0;
    }
    
    .toc-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    [data-animate] {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ========================================
   Accessibility - Focus Styles
   ======================================== */

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
[tabindex]:focus:not(:focus-visible) {
    outline: none;
}

@media (prefers-color-scheme: dark) {
    a:focus-visible,
    button:focus-visible,
    [tabindex]:focus-visible {
        outline-color: var(--color-accent-light);
    }
}

[data-theme="dark"] a:focus-visible,
[data-theme="dark"] button:focus-visible,
[data-theme="dark"] [tabindex]:focus-visible {
    outline-color: var(--color-accent-light);
}

/* ========================================
   Reading Page
   ======================================== */

.reading-page {
    /* Ensures proper spacing for fixed header */
}

/* Progress bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-accent);
    z-index: 200;
    transition: width 0.1s linear;
}

/* Reading header */
.reading-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(0);
    transition: transform var(--duration-medium) var(--ease-out-expo);
}

.reading-header.hidden {
    transform: translateY(-100%);
}

.reading-header-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: 0.6rem var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.reading-header-title {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
}

.reading-header-section {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--color-text-tertiary);
}

.reading-header-nav {
    display: flex;
    gap: var(--space-sm);
}

.reading-header-nav button {
    background: none;
    border: 1px solid var(--color-border);
    padding: 0.4rem 0.8rem;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
}

.reading-header-nav button:hover:not(:disabled) {
    border-color: var(--color-text);
    color: var(--color-text);
}

.reading-header-nav button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Section display */
.section {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

.section-meta {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.section-part {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-xs);
}

.section-number {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section-reading-time {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

/* Section content */
.section-content {
    font-size: 1.125rem;
    line-height: 1.85;
}

.section-content p {
    margin-bottom: 1.5em;
}

.section-content p:last-child {
    margin-bottom: 0;
}

.section-content ul {
    margin: 1em 0 1.5em 0;
    padding-left: 1.5em;
    list-style: disc;
}

.section-content ul li {
    margin-bottom: 0.6em;
    line-height: 1.7;
}

.section-content ul li:last-child {
    margin-bottom: 0;
}

/* Nested lists - tighter spacing, different bullet */
.section-content ul ul {
    margin: 0.5em 0 0.5em 0;
    list-style: circle;
}

.section-content ul ul li {
    margin-bottom: 0.4em;
}

/* Section ornament */
.section-ornament {
    text-align: center;
    margin-bottom: var(--space-md);
    color: var(--color-border-dark);
    font-size: 1.25rem;
    letter-spacing: 0.5em;
    opacity: 0.4;
}

.section-ornament::before {
    content: "···";
}

/* Section sources */
.section-sources {
    display: block;
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.sources-heading {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

.sources-list {
    list-style: decimal;
    padding-left: 1.5rem;
    margin: 0;
}

.sources-list li {
    font-family: var(--font-body);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    padding: 0.4rem 0;
}

.sources-list li a {
    color: var(--color-accent);
    text-decoration: none;
    word-break: break-word;
}

.sources-list li a:hover {
    text-decoration: underline;
}

/* Section navigation */
.section-footer {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.section-nav-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.section-nav-link {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-decoration: none;
    padding: var(--space-md);
    background-color: var(--color-bg-warm);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    min-height: 80px;
    transition: all var(--duration-medium) var(--ease-out-expo);
}

.section-nav-link:hover {
    border-color: var(--color-accent);
    background-color: var(--color-bg-alt);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.section-nav-link.prev {
    text-align: left;
}

.section-nav-link.next {
    text-align: right;
}

.section-nav-label {
    display: block;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
}

.section-nav-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    color: var(--color-text);
    line-height: 1.3;
}

/* Table of contents drawer */
.toc-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 460px;
    max-width: 90vw;
    background-color: var(--color-bg);
    border-right: 1px solid var(--color-border);
    z-index: 300;
    transform: translateX(-100%);
    transition: transform var(--duration-medium) var(--ease-out-expo);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.toc-drawer.open {
    transform: translateX(0);
}

.toc-drawer-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 299;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-medium) ease, visibility var(--duration-medium) ease;
}

.toc-drawer-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.toc-drawer-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toc-drawer-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
}

.toc-drawer-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
}

.toc-drawer-search {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.toc-drawer-search input {
    width: 100%;
    padding: 0.6rem 0.8rem;
    font-family: var(--font-ui);
    font-size: 0.85rem;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
    outline: none;
    transition: border-color var(--duration-fast) ease;
}

.toc-drawer-search input::placeholder {
    color: var(--color-text-tertiary);
}

.toc-drawer-search input:focus {
    border-color: var(--color-accent);
}

.toc-drawer-results {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    max-height: 300px;
    overflow-y: auto;
}

.search-result {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
}

.search-result:last-child {
    border-bottom: none;
}

.search-result:hover {
    background: var(--color-bg-alt);
    margin: 0 calc(-1 * var(--space-lg));
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}

.search-result-section {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    margin-bottom: 0.25rem;
}

.search-result-text {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.search-result-text mark {
    background: transparent;
    color: var(--color-text);
    font-weight: 500;
}

.search-no-results {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    text-align: center;
    padding: var(--space-md) 0;
}

.toc-drawer-content {
    padding: var(--space-lg);
    overflow-y: auto;
    flex: 1;
}

.toc-drawer-part {
    margin-bottom: var(--space-lg);
}

.toc-drawer-part-title {
    font-family: var(--font-ui);
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-sm);
}

.toc-drawer-sections {
    list-style: none;
}

.toc-drawer-sections a {
    display: block;
    padding: 0.6rem 0;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
    transition: color var(--duration-fast) ease;
}

.toc-drawer-sections a:hover,
.toc-drawer-sections a.active {
    color: var(--color-text);
}

.toc-drawer-sections a.active {
    font-weight: 500;
}

.toc-drawer-sections a.read::after {
    content: "✓";
    margin-left: 0.5rem;
    color: var(--color-accent);
    font-size: 0.75rem;
}

/* Toggle button */
.toc-toggle {
    position: fixed;
    bottom: var(--space-lg);
    left: var(--space-lg);
    z-index: 100;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
}

.toc-toggle:hover {
    border-color: var(--color-text);
}

/* Mobile theme toggle in header */
.mobile-theme-toggle {
    display: none;
}

.mobile-theme-toggle .icon-sun {
    display: none;
}

.mobile-theme-toggle .icon-moon {
    display: block;
}

[data-theme="dark"] .mobile-theme-toggle .icon-sun {
    display: block;
}

[data-theme="dark"] .mobile-theme-toggle .icon-moon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    .mobile-theme-toggle .icon-sun {
        display: block;
    }
    
    .mobile-theme-toggle .icon-moon {
        display: none;
    }
}

/* ========================================
   Reading Page - Responsive
   ======================================== */

@media (max-width: 768px) {
    .reading-header-inner {
        padding: 0.6rem var(--space-md);
    }
    
    .reading-header-section {
        display: none;
    }
    
    /* Account for fixed header height on mobile */
    .section {
        padding: calc(60px + var(--space-lg)) var(--space-md) var(--space-lg);
    }
    
    .section-title {
        font-size: clamp(1.75rem, 6vw, 2.25rem);
    }
    
    .section-nav-grid {
        grid-template-columns: 1fr;
    }
    
    .section-nav-link.next {
        text-align: left;
    }
    
    /* Hide floating buttons on mobile - use header instead */
    .toc-toggle {
        display: none;
    }
    
    .reading-page .theme-toggle {
        display: none;
    }
    
    .toc-drawer {
        width: 100%;
        max-width: 100%;
    }
    
    .toc-drawer-header {
        padding: var(--space-md);
    }
    
    .toc-drawer-content {
        padding: var(--space-md);
    }
    
    .toc-drawer-search {
        padding: var(--space-sm) var(--space-md);
    }
    
    /* Add theme toggle to header on mobile */
    .reading-header-nav {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }
    
    /* Ensure 44px minimum touch targets on mobile */
    .reading-header-nav button {
        min-width: 44px;
        min-height: 44px;
        padding: 0.5rem 0.75rem;
    }
    
    .mobile-theme-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: 1px solid var(--color-border);
        padding: 0.5rem;
        min-width: 44px;
        min-height: 44px;
        cursor: pointer;
        color: var(--color-text-secondary);
    }
    
    .mobile-theme-toggle svg {
        width: 18px;
        height: 18px;
    }
    
    /* Section content adjustments */
    .section-content p {
        font-size: 1rem;
    }
    
    .section-sources {
        padding: var(--space-md) 0;
    }
}

/* Dark mode adjustments for reading page */
[data-theme="dark"] .section-nav-link:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    .toc-drawer {
        transition: none;
    }
    
    .toc-drawer-overlay {
        transition: none;
    }
    
    .reading-header {
        transition: none;
    }
    
    .section-content {
        transition: none;
    }
}

/* ========================================
   Paragraph Deep-Linking
   ======================================== */

.linkable-paragraph {
    cursor: pointer;
    transition: background-color 0.3s ease;
    border-radius: 4px;
    margin-left: -0.5rem;
    margin-right: -0.5rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.linkable-paragraph:hover {
    background-color: var(--color-accent-muted);
}

.paragraph-linked {
    background-color: var(--color-accent-muted) !important;
}

.paragraph-highlighted {
    background-color: var(--color-accent-muted);
    animation: highlightFade 2s ease-out forwards;
}

@keyframes highlightFade {
    0% { background-color: var(--color-accent-muted); }
    100% { background-color: transparent; }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    /* Reset to light theme */
    :root {
        --color-bg: #ffffff !important;
        --color-text: #1a1a1a !important;
        --color-text-secondary: #4a4a4a !important;
        --color-text-tertiary: #6a6a6a !important;
        --color-accent: #2c5aa0 !important;
        --color-border: #e0e0e0 !important;
    }
    
    /* Hide UI elements */
    .reading-header,
    .reading-progress,
    .toc-drawer,
    .toc-drawer-overlay,
    .section-nav,
    .theme-toggle,
    .toc-toggle,
    .section-sources summary,
    .linkable-paragraph:hover {
        display: none !important;
    }
    
    /* Reset backgrounds */
    body,
    .section,
    .section-content {
        background: white !important;
        color: black !important;
    }
    
    /* Typography for print */
    body {
        font-size: 11pt;
        line-height: 1.5;
    }
    
    .section-content p {
        font-size: 11pt;
        margin-bottom: 1em;
        orphans: 3;
        widows: 3;
    }
    
    .section-content h1,
    .section-content h2,
    .section-content h3 {
        page-break-after: avoid;
    }
    
    /* Section header */
    .section-header {
        padding-top: 0;
        margin-bottom: 2em;
    }
    
    .section-part {
        font-size: 10pt;
    }
    
    .section-number {
        font-size: 9pt;
    }
    
    .section-title {
        font-size: 18pt;
    }
    
    .section-reading-time {
        display: none;
    }
    
    /* Diagrams */
    .section-diagram {
        page-break-inside: avoid;
        border: none;
        opacity: 1 !important;
        transform: none !important;
    }
    
    .section-diagram svg {
        max-width: 100%;
        height: auto;
    }
    
    /* Sources - show expanded */
    .section-sources {
        page-break-before: always;
    }
    
    .section-sources details {
        display: block;
    }
    
    .section-sources details[open] summary ~ * {
        display: block;
    }
    
    /* Links */
    a {
        color: black !important;
        text-decoration: underline;
    }
    
    a[href^="http"]:after {
        content: " (" attr(href) ")";
        font-size: 9pt;
        color: #666;
    }
    
    /* Figures */
    .figure {
        font-weight: 600;
    }
    
    /* Page margins */
    @page {
        margin: 1in;
        size: letter;
    }
    
    @page :first {
        margin-top: 1.5in;
    }
}