/* ============================================================
   Pillar CMS — Default Theme Stylesheet
   System-font stack, responsive layout, no external dependencies.
   ============================================================ */

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

:root {
    --color-bg:          #ffffff;
    --color-surface:     #f8f8f8;
    --color-border:      #e2e2e2;
    --color-text:        #1a1a1a;
    --color-muted:       #6b7280;
    --color-accent:      #3b6ef5;
    --color-accent-dark: #2952c7;
    --color-danger:      #dc2626;

    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
                 Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', Menlo, Monaco, Consolas,
                 'Courier New', monospace;

    --radius:    6px;
    --radius-lg: 12px;
    --shadow:    0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,.10);

    --max-content: 760px;
    --max-wide:    1200px;

    /* Legacy spacing (kept for back-compat) */
    --spacing-xs:  .25rem;
    --spacing-sm:  .5rem;
    --spacing-md:  1rem;
    --spacing-lg:  1.5rem;
    --spacing-xl:  2.5rem;
    --spacing-2xl: 4rem;

    /* Breakpoints (reference values) */
    --bp-xs:  480px;
    --bp-sm:  640px;
    --bp-md:  768px;
    --bp-lg:  1024px;
    --bp-xl:  1280px;
    --bp-2xl: 1536px;

    /* Fluid spacing scale */
    --space-xs:  clamp(0.25rem,  0.5vw,  0.375rem);
    --space-sm:  clamp(0.5rem,   1vw,    0.75rem);
    --space-md:  clamp(0.75rem,  1.5vw,  1rem);
    --space-lg:  clamp(1rem,     2.5vw,  1.5rem);
    --space-xl:  clamp(1.5rem,   4vw,    2.5rem);
    --space-2xl: clamp(2.5rem,   6vw,    4rem);

    /* Fluid typography scale */
    --text-xs:   clamp(0.6875rem, 1.2vw,  0.75rem);
    --text-sm:   clamp(0.8125rem, 1.5vw,  0.875rem);
    --text-base: clamp(0.9375rem, 1.8vw,  1rem);
    --text-lg:   clamp(1rem,      2vw,    1.125rem);
    --text-xl:   clamp(1.125rem,  2.5vw,  1.25rem);
    --text-2xl:  clamp(1.25rem,   3vw,    1.5rem);
    --text-3xl:  clamp(1.375rem,  3.5vw,  1.875rem);
    --text-4xl:  clamp(1.75rem,   4vw,    2.5rem);
    --text-5xl:  clamp(2.5rem,    6vw,    3.75rem);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg:      #0f0f0f;
        --color-surface: #1a1a1a;
        --color-border:  #2e2e2e;
        --color-text:    #e8e8e8;
        --color-muted:   #9ca3af;
    }
}

/* ---- Base ---- */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}
body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img, video, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--color-accent-dark); }

/* Focus: keyboard only */
:focus              { outline: none; }
:focus-visible      {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 3px;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.25;
    font-weight: 700;
    letter-spacing: -.015em;
    color: var(--color-text);
}
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.375rem, 3vw, 1.875rem); }
h3 { font-size: 1.25rem; }

p { margin-bottom: var(--spacing-md); }

code, kbd, samp {
    font-family: var(--font-mono);
    font-size: .875em;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: .1em .35em;
}

pre {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    overflow-x: auto;
    line-height: 1.5;
}
pre code { background: none; border: none; padding: 0; font-size: .9rem; }

blockquote {
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-sm) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    color: var(--color-muted);
    font-style: italic;
}

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

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

/* ---- Layout ---- */
.container {
    width: 100%;
    max-width: var(--max-wide);
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 1.5rem);
}

.container--narrow {
    max-width: var(--max-content);
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 1.5rem);
}

.container--wide {
    max-width: 1440px;
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 1.5rem);
}

#main-content { min-height: 60vh; padding-block: var(--spacing-xl); }

/* ---- Responsive Grid ---- */
.grid      { display: grid; gap: var(--space-xl); }
.grid--1   { grid-template-columns: 1fr; }
.grid--2   { grid-template-columns: repeat(2, 1fr); }
.grid--3   { grid-template-columns: repeat(3, 1fr); }
.grid--4   { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr)); }

@media (max-width: 767px) {
    .grid--2,
    .grid--3,
    .grid--4 { grid-template-columns: 1fr; }
}
@media (min-width: 640px) and (max-width: 1023px) {
    .grid--3,
    .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

/* ---- Aspect Ratio ---- */
.aspect-video  { aspect-ratio: 16 / 9; overflow: hidden; }
.aspect-square { aspect-ratio: 1 / 1;  overflow: hidden; }
.aspect-4-3    { aspect-ratio: 4 / 3;  overflow: hidden; }
.aspect-video > *,
.aspect-square > *,
.aspect-4-3 > * { width: 100%; height: 100%; object-fit: cover; }

.responsive-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}
.responsive-embed iframe,
.responsive-embed embed,
.responsive-embed video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ---- Skip Link ---- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--spacing-md);
    background: var(--color-accent);
    color: #fff;
    padding: .5em 1em;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    z-index: 9999;
    transition: top .15s;
}
.skip-link:focus { top: var(--spacing-md); }

/* ---- Site Header ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding-block: var(--spacing-md);
}

.site-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -.02em;
}
.site-title:hover { color: var(--color-accent); }

/* ---- Primary Navigation ---- */
.site-nav { display: flex; align-items: center; gap: var(--spacing-sm); position: relative; }

.nav-menu,
.primary-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    padding: 0;
    margin: 0;
}

.nav-menu li a,
.primary-menu li a {
    display: block;
    padding: .4em .8em;
    border-radius: var(--radius);
    color: var(--color-text);
    font-weight: 500;
    text-decoration: none;
    transition: background .15s, color .15s;
}
.nav-menu li a:hover,
.nav-menu li a[aria-current="page"],
.primary-menu li a:hover,
.primary-menu li a[aria-current="page"] {
    background: var(--color-surface);
    color: var(--color-accent);
}

/* Hamburger icon */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 18px;
    height: 18px;
}
.hamburger span {
    display: block;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: .4em .6em;
    cursor: pointer;
    color: var(--color-text);
    font-size: 1.1rem;
    line-height: 1;
    align-items: center;
    min-height: 44px;
    min-width: 44px;
    justify-content: center;
}

@media (max-width: 640px) {
    .nav-toggle { display: flex; }

    .site-nav .nav-menu,
    .site-nav .primary-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: -1rem;
        right: -1rem;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        border-top: 1px solid var(--color-border);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        z-index: 99;
        box-shadow: var(--shadow-md);
    }
    .site-nav.is-open .nav-menu,
    .site-nav.is-open .primary-menu { display: flex; }
    .site-nav .nav-menu li a,
    .site-nav .primary-menu li a {
        padding: .6em var(--spacing-md);
        font-size: 1rem;
    }
}

/* ---- Site Footer ---- */
.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    padding-block: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.site-footer__inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-md) var(--space-xl);
    align-items: center;
}

.footer-widgets:empty { display: none; }
.footer-widgets:not(:empty) {
    grid-column: 1 / -1;
}

.footer-copy { color: var(--color-muted); font-size: .875rem; }
.footer-copy a { color: var(--color-muted); }

.footer-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    padding: 0;
    margin: 0;
}
.footer-menu a {
    color: var(--color-muted);
    font-size: .875rem;
    text-decoration: none;
}
.footer-menu a:hover { color: var(--color-accent); text-decoration: underline; }

@media (max-width: 640px) {
    .site-footer__inner {
        grid-template-columns: 1fr;
        text-align: center;
        justify-items: center;
    }
    .footer-menu { justify-content: center; }
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: .4em;
    padding: .55em 1.2em;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: .9375rem;
    text-decoration: none;
    cursor: pointer;
    transition: background .15s, box-shadow .15s;
    border: 2px solid transparent;
    min-height: 44px;
}
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-dark); color: #fff; }
.btn--outline { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn--outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn-text { color: var(--color-accent); font-weight: 600; font-size: .875rem; text-decoration: none; }
.btn-text:hover { text-decoration: underline; }

/* Touch targets */
@media (pointer: coarse) {
    .pagination a,
    .pagination span { min-height: 44px; min-width: 44px; }
}

/* ---- Post Cards (index.php) ---- */
.archive-header { margin-bottom: var(--spacing-xl); }
.archive-title { font-size: clamp(1.5rem, 3vw, 2rem); }

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: var(--spacing-xl);
}

.post-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: box-shadow .2s, transform .2s;
}
.post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.post-card__thumb { display: block; overflow: hidden; aspect-ratio: 16/9; }
.post-card__thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s; }
.post-card__thumb:hover img { transform: scale(1.03); }

.post-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
}

.post-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: .8125rem;
    color: var(--color-muted);
}
.post-meta__sep { color: var(--color-border); }

.post-card__title { font-size: 1.125rem; margin: 0; }
.post-card__title a { color: var(--color-text); text-decoration: none; }
.post-card__title a:hover { color: var(--color-accent); }

.post-card__excerpt {
    color: var(--color-muted);
    font-size: .9375rem;
    flex: 1;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.no-content { text-align: center; padding-block: var(--spacing-2xl); color: var(--color-muted); }

/* ---- Pagination ---- */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}
.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    height: 2.25rem;
    padding-inline: .5em;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    font-size: .9rem;
    transition: background .15s;
}
.pagination a:hover { background: var(--color-surface); }
.pagination .current { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }

/* ---- Single Post / Page ---- */
.single-post,
.page-content {
    max-width: var(--max-content);
    margin-inline: auto;
}

.entry-header { margin-bottom: var(--spacing-xl); }

.entry-thumbnail { margin-bottom: var(--spacing-lg); border-radius: var(--radius-lg); overflow: hidden; }
.entry-thumbnail__img { width: 100%; max-height: 480px; object-fit: cover; }

.page-hero { margin-bottom: var(--spacing-lg); border-radius: var(--radius-lg); overflow: hidden; }
.page-hero__img { width: 100%; max-height: 400px; object-fit: cover; }

.entry-title { margin-bottom: var(--spacing-sm); }
.entry-excerpt { color: var(--color-muted); font-size: 1.0625rem; margin-top: var(--spacing-sm); }

.entry-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-muted);
    font-size: .875rem;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}
.entry-meta__sep { color: var(--color-border); }
.entry-date { color: var(--color-muted); font-size: .875rem; }

.entry-content { font-size: 1.0625rem; line-height: 1.8; }
.entry-content h2 { margin-top: var(--spacing-xl); margin-bottom: var(--spacing-md); }
.entry-content h3 { margin-top: var(--spacing-lg); margin-bottom: var(--spacing-sm); }
.entry-content img { border-radius: var(--radius); margin-block: var(--spacing-lg); max-width: 100%; height: auto; }
.entry-content figure.content-image { margin-block: var(--spacing-lg); }
.entry-content figure.content-image figcaption {
    text-align: center;
    font-size: .875rem;
    color: var(--color-muted);
    margin-top: var(--spacing-xs);
}
.entry-content a { font-weight: 500; }
.entry-content ul,
.entry-content ol { margin-bottom: var(--spacing-md); }

.entry-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* ---- 404 Page ---- */
.error-page {
    text-align: center;
    padding-block: var(--spacing-2xl);
    max-width: 480px;
    margin-inline: auto;
}
.error-page__code {
    font-size: clamp(5rem, 20vw, 9rem);
    font-weight: 900;
    color: var(--color-border);
    line-height: 1;
    margin-bottom: var(--spacing-md);
}
.error-page__title { margin-bottom: var(--spacing-md); }
.error-page__message { color: var(--color-muted); margin-bottom: var(--spacing-xl); }

/* ---- Utility ---- */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border-width: 0;
}

/* ---- 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;
    }
}

/* ---- Print ---- */
@media print {
    .site-header, .site-footer, .nav-toggle, .pagination { display: none; }
    body { color: #000; }
    a { color: #000; text-decoration: underline; }
}