/* ============================================
   THE SECRET OF PI — Ghost Theme Stylesheet
   ============================================
   Design: Deep navy + gold on cream. Scholarly,
   contemplative, beautiful. Mathematical.
   ============================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
    --color-bg: #FAF8F3;
    --color-bg-alt: #F2EDE4;
    --color-bg-dark: #0B1226;
    --color-navy: #0B1226;
    --color-navy-light: #1A2744;
    --color-gold: #C4973B;
    --color-gold-light: #D4AA4F;
    --color-gold-pale: #E8D5A3;
    --color-text: #2C2C2C;
    --color-text-secondary: #6B6B6B;
    --color-text-light: #E8E4DC;
    --color-border: #DDD6C8;
    --color-accent: #8B4E6A;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Libre Baskerville', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --width-content: 720px;
    --width-wide: 1080px;
    --width-full: 1320px;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-xxl: 10rem;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

a {
    color: var(--color-gold);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-gold-light);
}

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

::selection {
    background-color: var(--color-gold-pale);
    color: var(--color-navy);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-navy);
}

h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 2.2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.3rem; }

p {
    margin-bottom: 1.5rem;
}

blockquote {
    border-left: 3px solid var(--color-gold);
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-style: italic;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

code, pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

pre {
    background-color: var(--color-navy);
    color: var(--color-text-light);
    padding: var(--space-md);
    border-radius: 4px;
    overflow-x: auto;
    margin: var(--space-md) 0;
}

code {
    background-color: var(--color-bg-alt);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

pre code {
    background: none;
    padding: 0;
}

hr {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin: var(--space-lg) auto;
    max-width: 200px;
}

/* --- Decorative Elements --- */
.ornament {
    text-align: center;
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-gold);
    letter-spacing: 0.3em;
    margin: var(--space-lg) 0;
}

/* --- Layout --- */
.sopi-container {
    max-width: var(--width-content);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.sopi-container--wide {
    max-width: var(--width-wide);
}

.sopi-container--full {
    max-width: var(--width-full);
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.sopi-header {
    background-color: var(--color-navy);
    padding: var(--space-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(196, 151, 59, 0.2);
}

.sopi-header__inner {
    max-width: var(--width-full);
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sopi-header__logo {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--color-text-light);
    text-decoration: none;
    letter-spacing: 0.08em;
    transition: color 0.3s ease;
}

.sopi-header__logo:hover {
    color: var(--color-gold);
}

.sopi-header__logo span {
    color: var(--color-gold);
    font-weight: 500;
}

.sopi-header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.sopi-header__nav a {
    font-family: var(--font-display);
    font-size: 0.95rem;
    color: var(--color-text-light);
    text-decoration: none;
    letter-spacing: 0.05em;
    opacity: 0.75;
    transition: opacity 0.3s ease, color 0.3s ease;
}

.sopi-header__nav a:hover,
.sopi-header__nav a.nav-current {
    opacity: 1;
    color: var(--color-gold);
}

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

.sopi-header__actions a {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-text-light);
    opacity: 0.75;
    transition: opacity 0.3s ease;
}

.sopi-header__actions a:hover {
    opacity: 1;
    color: var(--color-gold);
}

.sopi-btn {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    padding: 0.5em 1.5em;
    border: 1px solid var(--color-gold);
    color: var(--color-gold) !important;
    opacity: 1 !important;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.sopi-btn:hover {
    background-color: var(--color-gold);
    color: var(--color-navy) !important;
}

/* Mobile nav toggle */
.sopi-header__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.sopi-header__toggle svg {
    width: 24px;
    height: 24px;
    stroke: var(--color-text-light);
}

@media (max-width: 768px) {
    .sopi-header__toggle { display: block; }
    .sopi-header__nav { display: none; }
    .sopi-header__nav.is-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-navy);
        padding: var(--space-md);
        border-bottom: 1px solid rgba(196, 151, 59, 0.2);
    }
    .sopi-header__actions .sopi-btn { font-size: 0.8rem; padding: 0.4em 1em; }
}

/* ============================================
   HERO (Home Page)
   ============================================ */
.sopi-hero {
    background-color: var(--color-navy);
    padding: var(--space-xxl) var(--space-md);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.sopi-hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    border-radius: 50%;
    border: 1px solid rgba(196, 151, 59, 0.08);
    pointer-events: none;
}

.sopi-hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    height: 400px;
    border-radius: 50%;
    border: 1px solid rgba(196, 151, 59, 0.05);
    pointer-events: none;
}

.sopi-hero__pi {
    font-family: var(--font-display);
    font-size: 8rem;
    font-weight: 300;
    color: var(--color-gold);
    line-height: 1;
    margin-bottom: var(--space-md);
    opacity: 0.9;
}

.sopi-hero__title {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 300;
    color: var(--color-text-light);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.sopi-hero__subtitle {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 300;
    color: var(--color-gold-pale);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: var(--space-lg);
    opacity: 0.7;
}

.sopi-hero__epigraph {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.2rem;
    color: rgba(232, 228, 220, 0.5);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============================================
   POST FEED (Index / Tag pages)
   ============================================ */
.sopi-feed {
    padding: var(--space-xl) 0;
}

.sopi-feed__title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

.sopi-card {
    display: block;
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    transition: transform 0.2s ease;
}

.sopi-card:first-child {
    border-top: none;
}

.sopi-card:hover {
    transform: translateX(4px);
}

.sopi-card__tag {
    font-family: var(--font-display);
    font-size: 0.8rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--space-xs);
    display: block;
}

.sopi-card__title {
    font-family: var(--font-display);
    font-size: 1.7rem;
    font-weight: 400;
    color: var(--color-navy);
    margin-bottom: 0.5rem;
    line-height: 1.3;
    transition: color 0.3s ease;
}

.sopi-card:hover .sopi-card__title {
    color: var(--color-gold);
}

.sopi-card__excerpt {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 0.5rem;
}

.sopi-card__meta {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.03em;
}

/* Featured card */
.sopi-card--featured {
    padding: var(--space-lg) var(--space-md);
    background-color: var(--color-bg-alt);
    border: none;
    margin-bottom: var(--space-md);
}

.sopi-card--featured .sopi-card__title {
    font-size: 2.2rem;
}

/* ============================================
   SINGLE POST
   ============================================ */
.sopi-post {
    padding: var(--space-xl) 0 var(--space-xxl);
}

.sopi-post__header {
    text-align: center;
    max-width: var(--width-content);
    margin: 0 auto var(--space-lg);
    padding: 0 var(--space-md);
}

.sopi-post__tag {
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-gold);
    margin-bottom: var(--space-sm);
    display: inline-block;
}

.sopi-post__title {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    color: var(--color-navy);
    line-height: 1.15;
    margin-bottom: var(--space-sm);
}

.sopi-post__meta {
    font-family: var(--font-display);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.03em;
}

.sopi-post__meta time {
    color: var(--color-gold);
}

/* Post content */
.sopi-post__content {
    max-width: var(--width-content);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.sopi-post__content h2 {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
    padding-bottom: 0.3rem;
    border-bottom: 1px solid var(--color-border);
}

.sopi-post__content h3 {
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

.sopi-post__content ul,
.sopi-post__content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.sopi-post__content li {
    margin-bottom: 0.5rem;
}

.sopi-post__content figure {
    margin: var(--space-lg) 0;
}

.sopi-post__content figcaption {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-top: var(--space-xs);
    font-style: italic;
}

.sopi-post__content .kg-image-card img,
.sopi-post__content .kg-gallery-image img {
    border-radius: 2px;
}

.sopi-post__content .kg-width-wide {
    max-width: var(--width-wide);
    margin-left: calc(50% - var(--width-wide) / 2);
    margin-right: calc(50% - var(--width-wide) / 2);
}

.sopi-post__content .kg-width-full {
    max-width: 100vw;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
}

/* Math blocks — KaTeX integration */
.sopi-post__content .math-block {
    text-align: center;
    margin: var(--space-md) 0;
    font-size: 1.2rem;
    overflow-x: auto;
}

/* Post feature image */
.sopi-post__feature-image {
    max-width: var(--width-wide);
    margin: 0 auto var(--space-lg);
    padding: 0 var(--space-md);
}

.sopi-post__feature-image img {
    width: 100%;
    border-radius: 2px;
}

/* ============================================
   PAGE TEMPLATE
   ============================================ */
.sopi-page {
    padding: var(--space-xl) 0 var(--space-xxl);
}

.sopi-page__header {
    text-align: center;
    max-width: var(--width-content);
    margin: 0 auto var(--space-lg);
    padding: 0 var(--space-md);
}

.sopi-page__title {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 300;
    color: var(--color-navy);
    letter-spacing: 0.05em;
}

.sopi-page__content {
    max-width: var(--width-content);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ============================================
   TAG PAGE
   ============================================ */
.sopi-tag-header {
    background-color: var(--color-navy);
    padding: var(--space-lg) var(--space-md);
    text-align: center;
}

.sopi-tag-header__name {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 300;
    color: var(--color-text-light);
    letter-spacing: 0.08em;
}

.sopi-tag-header__description {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--color-gold-pale);
    max-width: 600px;
    margin: var(--space-sm) auto 0;
    opacity: 0.7;
}

/* ============================================
   AUTHOR PAGE
   ============================================ */
.sopi-author-header {
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    text-align: center;
}

.sopi-author-header__avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto var(--space-sm);
    border: 2px solid var(--color-gold-pale);
}

.sopi-author-header__name {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-navy);
}

.sopi-author-header__bio {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    max-width: 520px;
    margin: var(--space-sm) auto 0;
}

/* ============================================
   FOOTER
   ============================================ */
.sopi-footer {
    background-color: var(--color-navy);
    padding: var(--space-xl) var(--space-md);
    text-align: center;
}

.sopi-footer__ornament {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--color-gold);
    opacity: 0.4;
    margin-bottom: var(--space-md);
}

.sopi-footer__text {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: rgba(232, 228, 220, 0.4);
    letter-spacing: 0.05em;
    line-height: 1.8;
}

.sopi-footer__text a {
    color: var(--color-gold-pale);
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.sopi-footer__text a:hover {
    opacity: 1;
}

.sopi-footer__nav {
    margin-top: var(--space-md);
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.sopi-footer__nav a {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: rgba(232, 228, 220, 0.4);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: color 0.3s ease;
}

.sopi-footer__nav a:hover {
    color: var(--color-gold);
}

/* ============================================
   PAGINATION
   ============================================ */
.sopi-pagination {
    padding: var(--space-lg) 0;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.sopi-pagination a {
    color: var(--color-gold);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-size: 0.85rem;
}

/* ============================================
   MEMBERS / SUBSCRIBE
   ============================================ */
.sopi-subscribe {
    background-color: var(--color-bg-alt);
    padding: var(--space-xl) var(--space-md);
    text-align: center;
    margin: var(--space-xl) 0 0;
}

.sopi-subscribe__title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 300;
    color: var(--color-navy);
    margin-bottom: var(--space-xs);
}

.sopi-subscribe__description {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.sopi-subscribe form {
    display: flex;
    justify-content: center;
    gap: var(--space-xs);
    max-width: 440px;
    margin: 0 auto;
}

.sopi-subscribe input[type="email"] {
    font-family: var(--font-display);
    font-size: 0.95rem;
    padding: 0.65em 1em;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    flex: 1;
    border-radius: 2px;
    outline: none;
    transition: border-color 0.3s ease;
}

.sopi-subscribe input[type="email"]:focus {
    border-color: var(--color-gold);
}

.sopi-subscribe button {
    font-family: var(--font-display);
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    padding: 0.65em 1.5em;
    background: var(--color-navy);
    color: var(--color-gold);
    border: 1px solid var(--color-navy);
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.sopi-subscribe button:hover {
    background: var(--color-gold);
    color: var(--color-navy);
    border-color: var(--color-gold);
}

/* ============================================
   ERROR PAGE
   ============================================ */
.sopi-error {
    text-align: center;
    padding: var(--space-xxl) var(--space-md);
}

.sopi-error__code {
    font-family: var(--font-display);
    font-size: 8rem;
    font-weight: 300;
    color: var(--color-gold);
    opacity: 0.3;
    line-height: 1;
}

.sopi-error__message {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-navy);
    margin-top: var(--space-sm);
}

.sopi-error__link {
    display: inline-block;
    margin-top: var(--space-md);
    font-family: var(--font-display);
    letter-spacing: 0.1em;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    html { font-size: 16px; }
    h1, .sopi-post__title { font-size: 2.2rem; }
    h2 { font-size: 1.7rem; }
    .sopi-hero__pi { font-size: 5rem; }
    .sopi-hero__title { font-size: 1.8rem; letter-spacing: 0.08em; }
    .sopi-hero__subtitle { font-size: 0.9rem; letter-spacing: 0.15em; }
    .sopi-hero { padding: var(--space-xl) var(--space-md); }
    .sopi-card--featured .sopi-card__title { font-size: 1.7rem; }
    .sopi-subscribe form { flex-direction: column; }
}

/* ============================================
   GHOST PORTAL OVERRIDES
   ============================================ */
.gh-portal-triggerbtn-iframe {
    /* Move Ghost's default subscribe button out of the way */
}

/* KaTeX overrides */
.katex-display {
    margin: var(--space-md) 0;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sopi-hero__pi,
.sopi-hero__title,
.sopi-hero__subtitle,
.sopi-hero__epigraph {
    animation: fadeInUp 0.8s ease-out backwards;
}

.sopi-hero__pi { animation-delay: 0s; }
.sopi-hero__title { animation-delay: 0.15s; }
.sopi-hero__subtitle { animation-delay: 0.3s; }
.sopi-hero__epigraph { animation-delay: 0.45s; }