/* ============================================================
   Golden Ratio Design System
   ============================================================

   φ (phi) = 1.618033988749895

   Every size — type, spacing, layout — derives from successive
   multiplication or division by φ. The ratio is also the
   mathematically ideal line height for body text.

   TYPE SCALE  (base = 1rem = 16px)
   ─────────────────────────────────────────────────────────
   --text-xs   = φ⁻¹   = 0.618rem  ( 9.9px)  labels, captions
   --text-sm   = φ⁻⁰˙⁵ = 0.786rem  (12.6px)  metadata, nav
   --text-base = φ⁰    = 1.000rem  (16.0px)  body
   --text-md   = φ⁰˙⁵  = 1.272rem  (20.4px)  subheadings, emphasis
   --text-lg   = φ¹    = 1.618rem  (25.9px)  h3, lead paragraphs
   --text-xl   = φ¹˙⁵  = 2.058rem  (32.9px)  h2
   --text-2xl  = φ²    = 2.618rem  (41.9px)  h1
   --text-3xl  = φ³    = 4.236rem  (67.8px)  display (home)

   SPACING SCALE  (base = 1rem)
   ─────────────────────────────────────────────────────────
   --space-xs  = φ⁻²   = 0.382rem  ( 6.1px)  micro gaps
   --space-sm  = φ⁻¹   = 0.618rem  ( 9.9px)  tight spacing
   --space-md  = φ⁰    = 1.000rem  (16.0px)  base unit
   --space-lg  = φ¹    = 1.618rem  (25.9px)  one line-height unit
   --space-xl  = φ²    = 2.618rem  (41.9px)  paragraph separation
   --space-2xl = φ³    = 4.236rem  (67.8px)  section separation
   --space-3xl = φ⁴    = 6.854rem (109.7px)  page-level

   LAYOUT
   ─────────────────────────────────────────────────────────
   Content column:  42rem         (reading width, ~672px)
   Wide layout:     42 × φ ≈ 68rem (header, footer, wider zones)
   Page padding:    φ¹ = 1.618rem  (one baseline unit)
   ============================================================ */


/* ============================================================
   Google Fonts
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap');


/* ============================================================
   Custom Properties
   ============================================================ */

:root {

    /* Type scale */
    --text-xs: 0.618rem;
    --text-sm: 0.786rem;
    --text-base: 1rem;
    --text-md: 1.272rem;
    --text-lg: 1.618rem;
    --text-xl: 2.058rem;
    --text-2xl: 2.618rem;
    --text-3xl: 4.236rem;

    /* Line heights */
    --leading-tight: 1.272;
    /* φ⁰˙⁵ — headings */
    --leading-normal: 1.618;
    /* φ    — body: the golden ratio IS the ideal leading */

    /* Spacing scale */
    --space-xs: 0.382rem;
    --space-sm: 0.618rem;
    --space-md: 1rem;
    --space-lg: 1.618rem;
    --space-xl: 2.618rem;
    --space-2xl: 4.236rem;
    --space-3xl: 6.854rem;

    /* Fonts */
    --font-sans: 'IBM Plex Sans', system-ui, sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Layout */
    --content-width: 42rem;
    --wide-width: 68rem;
    /* 42 × φ ≈ 67.96 */
    --page-padding: var(--space-lg);
    /* 1.618rem — one baseline unit */

    /* Colors — Light */
    --color-bg: #f7f3ee;
    --color-surface: #ede6dd;
    --color-surface-2: #e0d6ca;
    --color-text: #2b2118;
    --color-text-muted: #6b5a4e;
    --color-text-faint: #756058;
    --color-accent: #a0522d;
    --color-accent-hover: #7a3d20;
    --color-purple: #7b5ea7;
    --color-purple-hover: #5c4480;
    --color-border: #cfc4b8;
    --color-border-light: #e4dbd2;
}

[data-theme="dark"] {
    --color-bg: #1c1814;
    --color-surface: #272018;
    --color-surface-2: #322920;
    --color-text: #f0ebe4;
    --color-text-muted: #b0a098;
    --color-text-faint: #9e8d84;
    --color-accent: #c47a5a;
    --color-accent-hover: #d9957a;
    --color-purple: #a07fd4;
    --color-purple-hover: #c4a8e8;
    --color-border: #3d3028;
    --color-border-light: #2e2418;
}


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

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-weight: 400;
    font-feature-settings: 'kern' 1, 'liga' 1;
}

main {
    flex: 1;
    padding: var(--space-2xl) var(--page-padding) var(--space-3xl);
    max-width: var(--content-width);
    margin: 0 auto;
    width: 100%;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}


/* ============================================================
   Typography
   ============================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: var(--leading-tight);
    color: var(--color-text);
    letter-spacing: -0.02em;
}

h1 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-lg);
}

h2 {
    font-size: var(--text-xl);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-md);
}

h3 {
    font-size: var(--text-lg);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

h4 {
    font-size: var(--text-md);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-lg);
    line-height: var(--leading-normal);
}

a {
    color: var(--color-purple);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--color-purple-hover);
}

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

ul,
ol {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

li {
    margin-bottom: var(--space-sm);
    line-height: var(--leading-normal);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-surface-2);
    padding: 0.15em 0.4em;
    border-radius: 2px;
}

pre {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: var(--leading-normal);
    background: var(--color-surface-2);
    padding: var(--space-lg);
    border-left: 2px solid var(--color-accent);
    overflow-x: auto;
    margin-bottom: var(--space-lg);
}

pre code {
    background: none;
    padding: 0;
    font-size: inherit;
}

blockquote {
    border-left: 2px solid var(--color-accent);
    margin: var(--space-xl) 0;
    padding: var(--space-xs) 0 var(--space-xs) var(--space-lg);
    color: var(--color-text-muted);
    font-style: italic;
}

hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-2xl) 0;
}


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

.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--page-padding);
    position: relative;
    /* mobile nav drop-panel positions from here */
}

.header-inner {
    max-width: var(--wide-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
    /* padding-based height: ~3.3rem / 52px */
}

.site-name {
    font-family: var(--font-sans);
    font-size: var(--text-md);
    /* φ⁰˙⁵ = 1.272rem — nameplate sits above nav weight */
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-accent);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
}

.site-name:hover {
    color: var(--color-accent-hover);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 0;
    flex: 1;
    justify-content: right;
}

.site-nav a {
    font-size: var(--text-base);
    /* 1rem — up from 0.786rem */
    font-weight: 500;
    letter-spacing: 0.01em;
    color: var(--color-text-muted);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    /* 0.618rem × 1rem — proper touch targets */
    transition: color 0.15s;
    white-space: nowrap;
}

.site-nav a:hover {
    color: var(--color-text);
}

.site-nav a[aria-current="page"] {
    color: var(--color-accent);
    font-weight: 600;
}


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

/* Shared button skin — menu toggle and theme toggle */
#menu-toggle,
#theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 2px;
    cursor: pointer;
    color: var(--color-text-faint);
    padding: var(--space-xs) var(--space-sm);
    line-height: 1;
    flex-shrink: 0;
    transition: border-color 0.15s, color 0.15s;
}

#menu-toggle:hover,
#theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

/* Menu toggle — label treatment matches section labels */
#menu-toggle {
    display: none;
    /* hidden on desktop; shown at ≤900px */
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.menu-close-label {
    display: none;
}

#menu-toggle[aria-expanded="true"] .menu-open-label {
    display: none;
}

#menu-toggle[aria-expanded="true"] .menu-close-label {
    display: inline;
}

/* Theme toggle */
#theme-toggle {
    font-size: var(--text-base);
}

.icon-dark {
    display: none;
}

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

[data-theme="dark"] .icon-dark {
    display: inline;
}


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

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

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

.footer-copy {
    font-size: var(--text-sm);
    color: var(--color-text-faint);
    margin: 0;
}

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

.footer-social a {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color 0.15s;
}

.footer-social a:hover {
    color: var(--color-purple);
}


/* ============================================================
   Page Header  (page.njk)
   ============================================================ */

.page-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.page-subtitle {
    color: var(--color-text-muted);
    font-size: var(--text-md);
    font-weight: 400;
    margin-top: var(--space-sm);
    margin-bottom: 0;
    line-height: var(--leading-normal);
}

.page-content {
    line-height: var(--leading-normal);
}


/* ============================================================
   Home Page
   ============================================================ */

.home-intro {
    font-size: var(--text-lg);
    /* φ¹ = 1.618rem — a statement, not a blurb */
    font-weight: 300;
    /* light weight at large size: presence without aggression */
    line-height: var(--leading-normal);
    margin-bottom: var(--space-2xl);
    color: var(--color-text);
}

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

/* Section label — the systematic Müller-Brockmann column header */
.roles-section h2,
.recent-writing h2 {
    font-size: var(--text-xs);
    /* φ⁻¹ = 0.618rem — deliberately small, deliberately loud */
    font-family: var(--font-sans);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-faint);
    margin-top: 0;
    margin-bottom: var(--space-md);
    padding-top: var(--space-md);
    border-top: 2px solid var(--color-border);
}

.roles-section {
    margin-bottom: var(--space-2xl);
}

.role-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Two-column grid: role title / organization — tabular, systematic */
.role-list li {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: baseline;
    gap: var(--space-lg);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.role-list li:first-child {
    border-top: 1px solid var(--color-border-light);
}

.role-title {
    font-size: var(--text-base);
    font-weight: 500;
    color: var(--color-text);
}

.role-org {
    font-size: var(--text-sm);
    font-weight: 400;
    color: var(--color-text-muted);
    text-align: right;
}

.recent-writing {
    margin-bottom: var(--space-xl);
}

.post-list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-md);
}

.post-list li {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.post-list li:first-child {
    border-top: 1px solid var(--color-border-light);
}

.post-list a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
}

.post-list a:hover {
    color: var(--color-purple);
}

/* Tabular figures for dates — numbers align on the grid */
.post-list-date {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-text-faint);
    white-space: nowrap;
    flex-shrink: 0;
    font-feature-settings: 'tnum' 1;
}

.all-posts-link {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--color-accent);
    text-decoration: none;
}

.all-posts-link:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}


/* ============================================================
   Writing Index
   ============================================================ */

.writing-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.writing-list li {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.writing-list li:first-child {
    border-top: 1px solid var(--color-border-light);
}

.writing-list a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
}

.writing-list a:hover {
    color: var(--color-purple);
    text-decoration: underline;
}

/* .writing-list uses .post-list-date for date spans — shared class */

.writing-placeholder {
    color: var(--color-text-muted);
    font-style: italic;
}


/* ============================================================
   Blog Post
   ============================================================ */

.post {
    max-width: var(--content-width);
}

.post-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
}

.post-title {
    margin-bottom: var(--space-sm);
}

.post-date {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--color-text-faint);
    font-feature-settings: 'tnum' 1;
}

.post-lunar {
    display: block;
    margin-top: 0.15em;
}

.post-content {
    line-height: var(--leading-normal);
}


/* ============================================================
   Contact Cards
   ============================================================ */

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.contact-card {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: baseline;
    gap: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 2px;
    text-decoration: none;
    color: var(--color-text);
    transition: border-color 0.15s, background 0.15s;
}

.contact-card:hover {
    border-color: var(--color-purple);
    background: var(--color-surface-2);
    color: var(--color-text);
}

.contact-label {
    font-size: var(--text-base);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-text-faint);
}

.contact-handle {
    font-size: var(--text-lg);
    font-weight: 400;
    color: var(--color-purple);
}


/* ============================================================
   Mobile nav  (≤ 900px)
   ============================================================

   At this width the 6-item desktop nav no longer fits comfortably
   alongside the site name and controls. Switch to a hamburger that
   drops a full-width panel below the header.
   ============================================================ */

@media (max-width: 900px) {
    #menu-toggle {
        display: inline-flex;
        align-items: center;
    }

    /* Pull the nav out of flow; panel appears below header */
    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        z-index: 200;
        flex-direction: column;
        gap: 0;
        background: var(--color-surface);
        border-bottom: 2px solid var(--color-border);
        padding: var(--space-sm) var(--page-padding) var(--space-lg);
    }

    .site-nav.nav-open {
        display: flex;
    }

    .site-nav a {
        font-size: var(--text-base);
        font-weight: 500;
        padding: var(--space-md) 0;
        border-bottom: 1px solid var(--color-border-light);
        letter-spacing: 0;
    }

    .site-nav a:last-child {
        border-bottom: none;
    }
}


/* ============================================================
   Small screens  (≤ 600px)
   ============================================================ */

@media (max-width: 600px) {
    :root {
        --page-padding: var(--space-md);
        /* 1rem on small screens */
    }

    .home-intro {
        font-size: var(--text-md);
        /* step down one level */
    }

    /* Collapse role grid to stacked */
    .role-list li {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }

    .role-org {
        text-align: left;
    }

    .post-list li,
    .writing-list li {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .contact-card {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }
}