/* ============================================================
   OBSIDIAN MANUSCRIPT — Essay CSS
   Covers: essays/index.html (listing) + essays/essay1.html (individual)
   Dark mode default · Light mode via [data-theme="light"]
   ============================================================ */

/* ── DESIGN TOKENS ── */
:root {
    /* Ground */
    --bg:            #0A0A0A;
    --bg-surface:    #111111;
    --bg-elevated:   #181818;
    --border:        rgba(255, 255, 255, 0.08);
    --border-hover:  rgba(255, 255, 255, 0.16);

    /* Text */
    --text-primary:  #F0EDE8;
    --text-secondary: rgba(240, 237, 232, 0.65);
    --text-muted:    rgba(240, 237, 232, 0.38);

    /* Accents — Writing domain is Indigo */
    --accent-indigo:  #6366F1;
    --accent-emerald: #10B981;
    --accent-amber:   #F59E0B;
    --accent-violet:  #8B5CF6;

    /* Tag chip colours */
    --tag-present-bg:   rgba(99, 102, 241, 0.12);
    --tag-present-text: #818CF8;
    --tag-identity-bg:  rgba(139, 92, 246, 0.12);
    --tag-identity-text: #A78BFA;
    --tag-growth-bg:    rgba(16, 185, 129, 0.12);
    --tag-growth-text:  #34D399;
    --tag-language-bg:  rgba(245, 158, 11, 0.12);
    --tag-language-text: #FCD34D;

    /* Avatar */
    --avatar-bg:  rgba(99, 102, 241, 0.18);
    --avatar-text: #818CF8;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-ui:      'Inter', system-ui, sans-serif;
    --font-mono:    'JetBrains Mono', 'Courier New', monospace;

    /* Layout */
    --nav-height: 60px;
    --essay-width: 680px;
    --page-pad: clamp(20px, 5vw, 48px);

    /* Motion */
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --dur: 220ms;
}

/* ── LIGHT MODE OVERRIDES ── */
[data-theme="light"] {
    --bg:            #FAF9F6;
    --bg-surface:    #FFFFFF;
    --bg-elevated:   #F2F0EB;
    --border:        rgba(0, 0, 0, 0.08);
    --border-hover:  rgba(0, 0, 0, 0.18);

    --text-primary:  #1A1714;
    --text-secondary: rgba(26, 23, 20, 0.65);
    --text-muted:    rgba(26, 23, 20, 0.40);

    --tag-present-bg:    rgba(99, 102, 241, 0.10);
    --tag-present-text:  #4F46E5;
    --tag-identity-bg:   rgba(139, 92, 246, 0.10);
    --tag-identity-text: #7C3AED;
    --tag-growth-bg:     rgba(16, 185, 129, 0.10);
    --tag-growth-text:   #059669;
    --tag-language-bg:   rgba(245, 158, 11, 0.10);
    --tag-language-text: #B45309;

    --avatar-bg:   rgba(99, 102, 241, 0.10);
    --avatar-text: #4F46E5;
}

/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; }

html {
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-ui);
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
    transition: background 300ms var(--ease), color 300ms var(--ease);
}

body {
    min-height: 100vh;
    background: var(--bg);
    transition: background 300ms var(--ease);
}

/* ── NAVIGATION ── */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-height);
    padding: 0 var(--page-pad);
    display: flex;
    align-items: center;
    gap: 32px;
    background: color-mix(in srgb, var(--bg) 80%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background 300ms var(--ease), border-color 300ms var(--ease);
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--text-primary);
    text-decoration: none;
    margin-right: auto;
    transition: color var(--dur) var(--ease);
}
.nav-logo:hover { color: var(--accent-indigo); }

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--dur) var(--ease);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text-primary); }
.nav-links a.active {
    color: var(--accent-indigo);
}

/* ── THEME TOGGLE ── */
.theme-toggle {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg-surface);
    color: var(--text-secondary);
    cursor: pointer;
    display: grid;
    place-items: center;
    margin-left: 8px;
    transition:
        border-color var(--dur) var(--ease),
        background var(--dur) var(--ease),
        color var(--dur) var(--ease),
        transform var(--dur) var(--ease);
}
.theme-toggle:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: rotate(12deg);
}
.theme-toggle:focus-visible {
    outline: 2px solid var(--accent-indigo);
    outline-offset: 3px;
}

/* Show/hide the right icon per theme */
[data-theme="dark"]  .theme-icon--dark  { display: none; }
[data-theme="dark"]  .theme-icon--light { display: block; }
[data-theme="light"] .theme-icon--dark  { display: block; }
[data-theme="light"] .theme-icon--light { display: none; }

/* ── PAGE HEADER (listing page) ── */
.page-header {
    max-width: 760px;
    margin: clamp(40px, 8vw, 80px) auto 0;
    padding: 0 var(--page-pad);
}

.page-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent-indigo);
    margin-bottom: 12px;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    font-weight: 500;
    line-height: 1.05;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.page-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 520px;
}

/* ── FILTER BAR ── */
.filter-bar {
    max-width: 760px;
    margin: 32px auto 0;
    padding: 0 var(--page-pad);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    padding: 6px 14px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition:
        border-color var(--dur) var(--ease),
        color var(--dur) var(--ease),
        background var(--dur) var(--ease);
}
.filter-btn:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}
.filter-btn.active {
    border-color: var(--accent-indigo);
    color: var(--accent-indigo);
    background: rgba(99, 102, 241, 0.08);
}

/* ── ESSAY LIST ── */
.essay-list {
    max-width: 760px;
    margin: 32px auto 80px;
    padding: 0 var(--page-pad);
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* ── ESSAY CARD (Substack-style) ── */
.essay-card {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
    transition: border-color var(--dur) var(--ease);
}
.essay-card:first-child { border-top: 1px solid var(--border); }

.essay-card-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.essay-meta-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.author-chip {
    display: flex;
    align-items: center;
    gap: 8px;
}

.author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--avatar-bg);
    color: var(--avatar-text);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 500;
    display: grid;
    place-items: center;
    letter-spacing: 0.04em;
    flex-shrink: 0;
}

.author-name {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.essay-date {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.essay-link {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.essay-title {
    font-family: var(--font-display);
    font-size: clamp(1.05rem, 2.2vw, 1.3rem);
    font-weight: 600;
    line-height: 1.25;
    color: var(--text-primary);
    transition: color var(--dur) var(--ease);
}
.essay-link:hover .essay-title { color: var(--accent-indigo); }

.essay-excerpt {
    font-size: 0.875rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

.essay-meta-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 2px;
}

.essay-byline {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.essay-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.essay-tag {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 3px 9px;
    border-radius: 100px;
}

.tag-present  { background: var(--tag-present-bg);  color: var(--tag-present-text);  }
.tag-identity { background: var(--tag-identity-bg); color: var(--tag-identity-text); }
.tag-growth   { background: var(--tag-growth-bg);   color: var(--tag-growth-text);   }
.tag-language { background: var(--tag-language-bg); color: var(--tag-language-text); }

/* ── THUMBNAIL ── */
.essay-card-thumb {
    flex-shrink: 0;
    width: 120px;
    height: 80px;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border);
    display: block;
    background: var(--bg-elevated);
    transition: border-color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.essay-card-thumb:hover { opacity: 0.85; }
.essay-card-thumb span {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}
.essay-card-thumb--notebook {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.24), rgba(17, 17, 17, 0.9));
}
.essay-card-thumb--priorities {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(17, 17, 17, 0.9));
}
.essay-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ── INDIVIDUAL ESSAY PAGE ── */
.essay-page {
    max-width: var(--essay-width);
    margin: 0 auto;
    padding: clamp(32px, 6vw, 64px) var(--page-pad);
}

/* Essay Header */
.essay-header {
    margin-bottom: 32px;
}

.essay-tags-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.essay-headline {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5.5vw, 3.2rem);
    font-weight: 500;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.essay-deck {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-style: italic;
    font-family: var(--font-display);
}

.essay-author-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.essay-author-info {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.essay-author-name {
    font-weight: 600;
    color: var(--text-secondary);
}

.essay-author-sep { color: var(--text-muted); }

.essay-read-time {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Hero image */
.essay-hero-figure {
    margin: 0 0 40px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-elevated);
}

.essay-hero-img {
    width: 100%;
    height: clamp(200px, 40vw, 380px);
    object-fit: cover;
    display: block;
}

div.essay-hero-img {
    display: grid;
    place-items: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.essay-hero-img--notebook {
    background:
        linear-gradient(135deg, rgba(99, 102, 241, 0.28), transparent 55%),
        repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.06) 1px, transparent 1px, transparent 28px),
        var(--bg-elevated);
}

.essay-hero-img--priorities {
    background:
        linear-gradient(135deg, rgba(16, 185, 129, 0.26), transparent 55%),
        linear-gradient(90deg, transparent 0 48%, rgba(255, 255, 255, 0.08) 48% 52%, transparent 52%),
        var(--bg-elevated);
}

/* Essay Body — Typography */
.essay-body {
    font-family: var(--font-display);
    font-size: clamp(1.05rem, 1.8vw, 1.2rem);
    line-height: 1.85;
    color: var(--text-primary);
    transition: color 300ms var(--ease);
}

.essay-body p {
    margin-bottom: 1.6em;
}

/* Drop cap on first paragraph */
.essay-dropcap::first-letter {
    font-family: var(--font-display);
    font-size: 4.2em;
    font-weight: 600;
    line-height: 0.78;
    float: left;
    margin-right: 0.07em;
    margin-top: 0.1em;
    color: var(--accent-indigo);
}

.essay-body h2 {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 2.8vw, 1.7rem);
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
    margin: 2.4em 0 0.8em;
    letter-spacing: -0.01em;
}

.essay-body em {
    font-style: italic;
    color: inherit;
}

.essay-body strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* Blockquote */
.essay-blockquote {
    margin: 2em 0;
    padding: 0 0 0 24px;
    border-left: 2px solid var(--accent-indigo);
}

.essay-blockquote p {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    font-style: italic;
    line-height: 1.65;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ── ESSAY FOOTER ── */
.essay-footer {
    margin-top: 60px;
}

.essay-divider {
    height: 1px;
    background: linear-gradient(90deg, var(--accent-indigo), transparent);
    margin-bottom: 32px;
    opacity: 0.4;
}

.essay-nav-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.essay-back,
.essay-next {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--dur) var(--ease);
}
.essay-back:hover,
.essay-next:hover { color: var(--accent-indigo); }

/* ── SITE FOOTER ── */
.site-footer {
    padding: 32px var(--page-pad);
    border-top: 1px solid var(--border);
    text-align: center;
    transition: border-color 300ms var(--ease);
}

.footer-copy {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ── REDUCED MOTION ── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition-duration: 1ms !important;
        animation-duration: 1ms !important;
    }
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
    .essay-card {
        flex-direction: column-reverse;
        gap: 12px;
    }

    .essay-card-thumb {
        width: 100%;
        height: 160px;
    }

    .nav-links {
        gap: 16px;
    }

    .essay-author-row {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .nav-links a { display: none; }
    .nav-links a.active { display: block; }
}