/*
Theme Name: Ivory Sphere
Theme URI: https://www.ivorysphere.com
Author: Ivory Sphere
Author URI: https://www.ivorysphere.com
Description: A clean, minimal editorial theme for independent publishing. Content-forward with strong typography, JSON-LD schema support, and REST API compatibility.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.9
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ivorysphere
*/

/* ═══════════════════════════════════════
   CUSTOM PROPERTIES
   ═══════════════════════════════════════ */

:root {
    --color-primary: #2B2D42;
    --color-text: #333333;
    --color-bg: #FFFFFF;
    --color-card: #F8F8F8;
    --color-accent: #4A6FA5;
    --color-border: #E0E0E0;
    --color-meta: #777777;

    --cat-enterprise-security: #4A6FA5;
    --cat-technology-ai: #5B8C5A;
    --cat-business-services: #C76F30;
    --cat-consumer-lifestyle: #8B5E83;

    --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
    --font-body: Georgia, "Times New Roman", "Source Serif Pro", serif;
    --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;

    --max-width: 1200px;
    --content-width: 720px;
    --sidebar-width: 300px;
    --gap: 1.5rem;
}

/* ═══════════════════════════════════════
   RESET
   ═══════════════════════════════════════ */

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

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

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol {
    list-style: none;
}

/* ═══════════════════════════════════════
   TYPOGRAPHY
   ═══════════════════════════════════════ */

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-primary);
}

h1 { font-size: 2rem; margin-bottom: 0.75rem; }
h2 { font-size: 1.5rem; margin-bottom: 0.6rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.4rem; }

blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--color-meta);
}

pre, code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
}

pre {
    background: var(--color-card);
    padding: 1rem;
    overflow-x: auto;
    border-radius: 4px;
    margin: 1.5rem 0;
}

code {
    background: var(--color-card);
    padding: 0.15em 0.35em;
    border-radius: 3px;
}

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

/* ═══════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════ */

.site-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem;
}

.post-layout {
    display: block;
}

.content-area {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* ═══════════════════════════════════════
   HEADER
   ═══════════════════════════════════════ */

.site-header {
    background: var(--color-primary);
    color: #fff;
    padding: 0 1rem;
}

.site-header__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
    flex-wrap: wrap;
}

.site-branding a {
    color: #fff;
    text-decoration: none;
}

.site-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
}

.site-tagline {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 0.15rem;
}

.site-nav {
    display: none;
}

.site-nav.is-open {
    display: block;
    width: 100%;
    order: 3;
    padding: 0.75rem 0;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav-list li a {
    display: block;
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-ui);
    font-size: 0.875rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-list li a:hover,
.nav-list li.current-menu-item a,
.nav-list li.current-cat a {
    color: #fff;
    text-decoration: none;
}

/* Hamburger */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: #fff;
    transition: transform 0.2s, opacity 0.2s;
}

.hamburger.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.is-active span:nth-child(2) {
    opacity: 0;
}

.hamburger.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ═══════════════════════════════════════
   CARD GRID
   ═══════════════════════════════════════ */

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

.card {
    background: var(--color-card);
    border-radius: 6px;
    overflow: hidden;
    transition: box-shadow 0.15s ease;
}

.card:hover {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.card__image {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.card__image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 10;
    background: var(--color-border);
}

.card__body {
    padding: 1.25rem;
}

.card__category {
    display: inline-block;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

/* Category colors */
.card[data-category="enterprise-security"] .card__category { color: var(--cat-enterprise-security); }
.card[data-category="technology-ai"] .card__category { color: var(--cat-technology-ai); }
.card[data-category="business-services"] .card__category { color: var(--cat-business-services); }
.card[data-category="consumer-lifestyle"] .card__category { color: var(--cat-consumer-lifestyle); }

.card__title {
    font-size: 1.15rem;
    line-height: 1.35;
    margin-bottom: 0.5rem;
}

.card__title a {
    color: var(--color-primary);
}

.card__title a:hover {
    color: var(--color-accent);
    text-decoration: none;
}

.card__excerpt {
    font-size: 0.9rem;
    color: var(--color-meta);
    line-height: 1.5;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card__meta {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    color: var(--color-meta);
}

.card__meta span + span::before {
    content: "\00b7";
    margin: 0 0.4em;
}

/* ═══════════════════════════════════════
   CATEGORY TABS
   ═══════════════════════════════════════ */

.category-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.category-tab {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-meta);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    background: var(--color-card);
    transition: background 0.15s, color 0.15s;
}

.category-tab:hover {
    color: var(--color-primary);
    background: var(--color-border);
    text-decoration: none;
}

.category-tab--active {
    color: #fff;
    background: var(--color-primary);
}

.category-tab--active:hover {
    color: #fff;
    background: var(--color-primary);
}

/* ═══════════════════════════════════════
   BREADCRUMBS
   ═══════════════════════════════════════ */

.breadcrumbs {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--color-meta);
    margin-bottom: 1.5rem;
}

.breadcrumbs a {
    color: var(--color-meta);
}

.breadcrumbs a:hover {
    color: var(--color-accent);
}

.breadcrumbs .separator {
    margin: 0 0.4em;
}

/* ═══════════════════════════════════════
   SINGLE POST
   ═══════════════════════════════════════ */

.post-header {
    margin-bottom: 2rem;
}

.post-category {
    display: inline-block;
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.post-category[data-category="enterprise-security"] { color: var(--cat-enterprise-security); }
.post-category[data-category="technology-ai"] { color: var(--cat-technology-ai); }
.post-category[data-category="business-services"] { color: var(--cat-business-services); }
.post-category[data-category="consumer-lifestyle"] { color: var(--cat-consumer-lifestyle); }

.post-title {
    font-size: 2.25rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.post-meta {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-meta);
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
}

.post-featured-image {
    margin: 1.5rem 0 2rem;
    border-radius: 6px;
    overflow: hidden;
}

.post-featured-image img {
    width: 100%;
    height: auto;
}

/* Post content */
.post-content p {
    margin-bottom: 1.25rem;
}

.post-content h2 {
    margin-top: 2rem;
}

.post-content h3 {
    margin-top: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin: 1rem 0 1.25rem 1.5rem;
}

.post-content ul {
    list-style: disc;
}

.post-content ol {
    list-style: decimal;
}

.post-content li {
    margin-bottom: 0.35rem;
}

.post-content a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.post-content img {
    border-radius: 4px;
    margin: 1.5rem 0;
}

/* FAQ section */
.post-content .faq-section,
.post-content .wp-block-yoast-faq-block {
    margin: 2.5rem 0;
    padding: 1.5rem;
    background: var(--color-card);
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
}

.post-content .faq-section h2,
.post-content .faq-section h3 {
    font-size: 1.1rem;
    margin-top: 1.25rem;
    margin-bottom: 0.4rem;
    color: var(--color-primary);
}

.post-content .faq-section h2:first-child,
.post-content .faq-section h3:first-child {
    margin-top: 0;
}

.post-content .faq-section p {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

/* Author bio */
.author-bio {
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    padding: 1.5rem;
    margin-top: 2.5rem;
    background: var(--color-card);
    border-radius: 6px;
}

.author-bio__avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    flex-shrink: 0;
}

.author-bio__name {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.author-bio__description {
    font-size: 0.9rem;
    color: var(--color-meta);
    line-height: 1.5;
}

/* ═══════════════════════════════════════
   SIDEBAR
   ═══════════════════════════════════════ */

.sidebar {
    margin-top: 2.5rem;
}

.sidebar-widget {
    margin-bottom: 2rem;
}

.sidebar-widget__title {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
}

/* Category list in sidebar */
.sidebar-categories li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
    font-family: var(--font-ui);
    font-size: 0.875rem;
}

.sidebar-categories li a {
    color: var(--color-text);
}

.sidebar-categories li a:hover {
    color: var(--color-accent);
}

.sidebar-categories .cat-count {
    font-size: 0.75rem;
    color: var(--color-meta);
    background: var(--color-card);
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
}

/* Related posts in sidebar */
.sidebar-related li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
}

.sidebar-related li:last-child {
    border-bottom: none;
}

.sidebar-related__title {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.35;
}

.sidebar-related__title a {
    color: var(--color-primary);
}

.sidebar-related__title a:hover {
    color: var(--color-accent);
}

.sidebar-related__meta {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--color-meta);
    margin-top: 0.2rem;
}

/* ═══════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════ */

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 1rem;
    margin-top: 3rem;
}

.site-footer__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--color-meta);
}

/* ═══════════════════════════════════════
   PAGINATION
   ═══════════════════════════════════════ */

.nav-links {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2.5rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
}

.nav-links .page-numbers {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    color: var(--color-text);
    background: var(--color-card);
}

.nav-links .page-numbers:hover {
    background: var(--color-border);
    text-decoration: none;
}

.nav-links .page-numbers.current {
    background: var(--color-primary);
    color: #fff;
}

/* ═══════════════════════════════════════
   404 PAGE
   ═══════════════════════════════════════ */

.error-404 {
    text-align: center;
    padding: 4rem 1rem;
}

.error-404 h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.error-404 p {
    color: var(--color-meta);
    margin-bottom: 2rem;
}

.btn-home {
    display: inline-block;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    padding: 0.6rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    border-radius: 4px;
}

.btn-home:hover {
    background: var(--color-accent);
    color: #fff;
    text-decoration: none;
}

/* ═══════════════════════════════════════
   ARCHIVE HEADER
   ═══════════════════════════════════════ */

.archive-header {
    margin-bottom: 2rem;
}

.archive-header h1 {
    font-size: 1.75rem;
}

/* ═══════════════════════════════════════
   UTILITIES
   ═══════════════════════════════════════ */

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

/* ═══════════════════════════════════════
   MEDIA QUERIES
   ═══════════════════════════════════════ */

/* Tablet: 768px+ */
@media (min-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .site-main {
        padding: 2.5rem 1.5rem;
    }

    h1 { font-size: 2.25rem; }

    .post-title { font-size: 2.5rem; }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
    .card-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Header nav */
    .hamburger {
        display: none;
    }

    .site-nav {
        display: block;
        width: auto;
        order: 0;
    }

    .nav-list {
        flex-direction: row;
        gap: 0;
    }

    .nav-list li a {
        padding: 0.25rem 0.75rem;
        border-bottom: none;
    }

    /* Single post layout */
    .post-layout {
        display: grid;
        grid-template-columns: 1fr var(--sidebar-width);
        gap: 2.5rem;
        align-items: start;
    }

    .sidebar {
        position: sticky;
        top: 2rem;
        margin-top: 0;
    }

    .site-main {
        padding: 3rem 1.5rem;
    }
}