:root {
    /* Colors - Deep Midnight Blue */
    --bg-color: #0a0f16;
    --text-color: #EDEDED;
    --text-muted: #888888;
    --text-tertiary: #444444;
    --border-color: #333333;
    --input-focus: #ffffff;
    --accent-bg: rgba(255, 255, 255, 0.03);

    /* Typography */
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    --font-mono: "SF Mono", "Menlo", "Monaco", "Consolas", "Courier New", monospace;
    --fs-base: clamp(1.125rem, 2vw + 1rem, 1.35rem);
    --line-height: 1.6;
    --measure: 58ch;
    --measure-wide: 72ch;
    --grid-gap: clamp(2rem, 4vw, 4rem);

    /* Spacing */
    --spacing-fluid: clamp(1.5rem, 4vw, 3rem);
    --spacing-large: clamp(3rem, 6vw, 5rem);
}

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

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    font-size: var(--fs-base);
    line-height: var(--line-height);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

main {
    width: 100%;
    padding: var(--spacing-fluid);
}

/* Site identifier */
.site-name {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin: 0 auto 3rem auto;
    text-align: center;
    position: relative;
    display: block;
}

.site-name-main {
    opacity: 0.7;
}

/* Wrapper for fragment and dropdown - inline-block so dropdown positions relative to it */
.site-name-nav-wrapper {
    position: relative;
    display: inline-block;
    margin-left: 0.25rem;
}

/* Site name fragment (current page indicator) */
.site-name-fragment {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-color);
    opacity: 0.85;
    text-decoration: none;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.4);
    padding-bottom: 1px;
    transition: opacity 0.2s ease, border-bottom-color 0.2s ease, color 0.2s ease;
    position: relative;
    display: inline;
}

/* Extend hover area downward from fragment to bridge gap */
.site-name-fragment::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 0.5rem;
    background: transparent;
}

.site-name-fragment:hover,
.site-name-fragment:focus {
    opacity: 1;
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.6);
    outline: none;
}

/* Navigation dropdown */
.site-name-nav {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0;
    padding-top: 0.5rem; /* Extend hover area upward to bridge gap */
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
    z-index: 100;
    min-width: 120px;
    text-align: right;
}

/* Show dropdown on hover over fragment or the dropdown itself */
.site-name-fragment:hover ~ .site-name-nav,
.site-name-fragment:hover ~ .site-name-nav::before,
.site-name-nav:hover,
.site-name-nav:hover::before {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.nav-fragment {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-color);
    opacity: 0.85;
    text-decoration: none;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.4);
    padding: 0.25rem 0;
    padding-bottom: 1px;
    text-align: right;
    transition: opacity 0.2s ease, border-bottom-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

.nav-fragment:hover,
.nav-fragment:focus {
    opacity: 1;
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.6);
    outline: none;
}

/* Dim current page in dropdown */
.nav-fragment[data-page].current {
    opacity: 0.4;
    cursor: default;
    pointer-events: none;
}

/* Mobile: Toggle dropdown on tap */
@media (max-width: 768px) {
    .site-name-nav.nav-open {
        opacity: 1;
        visibility: visible;
        pointer-events: all;
    }
}

/* Default: All sections narrow and centered */
main > section {
    max-width: var(--measure);
    margin-left: auto;
    margin-right: auto;
}

/* Opening section override: wider */
main > section.opening {
    max-width: var(--measure-wide);
}

/* Typography Overrides */
p {
    margin-bottom: 1.5em;
    font-weight: 300;
}

strong {
    font-weight: 600;
    color: #fff;
}

/* Opening Section - Typography adjustments */
.opening {
    padding-bottom: var(--spacing-fluid);
}

.opening p {
    font-size: 1.05em;
    font-weight: 350;
    line-height: 1.7;
    margin-bottom: 1.75em;
}

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

/* Receipts section - the "aside" */
.receipts {
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    padding-left: 1.5rem;
    opacity: 0.92;
}

.receipts p {
    font-weight: 280;
}

/* Pattern Grid System */
.pattern-block {
    margin-bottom: var(--spacing-fluid);
    padding: 2rem 0;
    border-top: 1px solid var(--accent-bg);
}

.pattern-block blockquote {
    font-family: var(--font-stack);
    font-weight: 600;
    font-size: 1.25em;
    margin: 0 0 1rem 0;
    padding: 0;
    color: #fff;
    border: none;
    line-height: 1.3;
}

/* Hanging Punctuation */
.pattern-block blockquote {
    text-indent: -0.4em;
}

@media (min-width: 768px) {
    .pattern-block {
        display: grid;
        grid-template-columns: 1fr 1.5fr;
        gap: var(--grid-gap);
        align-items: baseline;
    }

    .pattern-block blockquote {
        margin: 0;
        position: sticky;
        top: 2rem;
        /* Adjust for font-size difference to align baselines or cap heights */
        transform: translateY(5px); 
    }
    
    .pattern-block p {
        margin-bottom: 0;
    }
}

/* Spacing Utilities */
.spacing-large {
    margin-top: var(--spacing-large);
}

.spacing-medium {
    margin-top: var(--spacing-fluid);
}

/* Form Styling */
form {
    width: 100%;
    margin-top: var(--spacing-large);
    padding-top: var(--spacing-large);
}

.form-group {
    margin-bottom: 2rem;
}

label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.5rem;
}

/* Form labels - visible and readable */
.form-group label {
    color: var(--text-color);
    opacity: 0.9;
    margin-bottom: 0.75rem;
}

.visually-hidden {
    /* Kept for accessibility, but we might want visible labels with this design */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

input, textarea {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--text-color);
    font-family: var(--font-mono); /* Monospace input for technical feel */
    font-size: 0.9rem;
    padding: 0.75rem 0;
    border-radius: 0;
    transition: border-color 0.3s ease;
}

textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

input:focus, textarea:focus {
    outline: none;
    border-bottom-color: rgba(255, 255, 255, 0.6);
}

input::placeholder, textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.5;
    font-family: var(--font-mono);
}

/* General Button (Submit/Action) */
button:not(.context-trigger) {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: var(--text-color);
    padding: 1rem 2.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-top: 1rem;
}

button:not(.context-trigger):hover {
    border-color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

button:not(.context-trigger):disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Form Messages */
.form-message {
    margin-top: 1.5rem;
    padding: 1rem;
    font-size: 0.9rem;
    line-height: 1.5;
    border-left: 2px solid currentColor;
    padding-left: 1rem;
}

/* Reveal Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* Book List Styling */
.book-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0 0;
    border-top: 1px solid var(--border-color);
}

.book-list li {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.book-title {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: #fff;
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.book-desc {
    display: block;
    color: var(--text-color);
    font-size: 1rem;
    opacity: 0.9;
}

@media (min-width: 768px) {
    .book-list li {
        display: grid;
        grid-template-columns: 1fr 1.5fr;
        gap: var(--grid-gap);
        align-items: baseline;
    }
    
    .book-title {
        margin-bottom: 0;
    }
}

/* Company List Styling */
.company-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    padding-bottom: var(--spacing-large);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.company-list li {
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 300;
    opacity: 0.85;
    padding: 0.5rem 0;
}

@media (min-width: 768px) {
    .company-list {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 2rem;
    }
}