/*
Theme Name: Nexus
Theme URI: https://nexustheme.io
Author: Nexus Theme Team
Author URI: https://nexustheme.io
Description: A professional, highly customizable multi-purpose WordPress theme for businesses, agencies, bloggers, and portfolios. Features a powerful Customizer, category-based homepage sections, dark mode, multiple header/footer layouts, and top-tier performance.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.6
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: nexus
Tags: custom-logo, custom-menu, featured-images, threaded-comments, translation-ready, full-width-template, theme-options, two-columns, one-column, right-sidebar, left-sidebar, footer-widgets, blog, news, portfolio, e-commerce, rtl-language-support
*/

/* ==========================================================================
   DESIGN TOKENS — CSS Custom Properties
   ========================================================================== */

:root {
  /* ── Brand Colors ── */
  --color-primary:         hsl(221, 83%, 53%);
  --color-primary-light:   hsl(221, 83%, 65%);
  --color-primary-dark:    hsl(221, 83%, 40%);
  --color-primary-rgb:     37, 99, 235;

  --color-secondary:       hsl(271, 76%, 53%);
  --color-secondary-light: hsl(271, 76%, 65%);
  --color-secondary-dark:  hsl(271, 76%, 40%);

  --color-accent:          hsl(162, 72%, 45%);
  --color-accent-light:    hsl(162, 72%, 57%);
  --color-accent-dark:     hsl(162, 72%, 33%);

  /* ── Neutral Palette ── */
  --color-bg:              hsl(0, 0%, 100%);
  --color-surface:         hsl(220, 14%, 96%);
  --color-surface-2:       hsl(220, 14%, 91%);
  --color-border:          hsl(220, 13%, 87%);
  --color-border-focus:    var(--color-primary);

  --color-text:            hsl(220, 20%, 15%);
  --color-text-muted:      hsl(220, 10%, 50%);
  --color-text-subtle:     hsl(220, 10%, 68%);
  --color-text-inverse:    hsl(0, 0%, 100%);

  /* ── Semantic Colors ── */
  --color-success:         hsl(142, 71%, 45%);
  --color-warning:         hsl(38, 92%, 50%);
  --color-danger:          hsl(0, 84%, 60%);
  --color-info:            hsl(199, 89%, 48%);

  /* ── Typography ── */
  --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif:    'Georgia', 'Times New Roman', serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --font-size-xs:   0.75rem;    /* 12px */
  --font-size-sm:   0.875rem;   /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg:   1.125rem;   /* 18px */
  --font-size-xl:   1.25rem;    /* 20px */
  --font-size-2xl:  1.5rem;     /* 24px */
  --font-size-3xl:  1.875rem;   /* 30px */
  --font-size-4xl:  clamp(2rem, 4vw, 2.5rem);
  --font-size-5xl:  clamp(2.5rem, 5vw, 3.5rem);
  --font-size-6xl:  clamp(3rem, 6vw, 4.5rem);

  --font-weight-light:      300;
  --font-weight-normal:     400;
  --font-weight-medium:     500;
  --font-weight-semibold:   600;
  --font-weight-bold:       700;
  --font-weight-extrabold:  800;

  --line-height-tight:  1.2;
  --line-height-snug:   1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed:1.75;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0em;
  --letter-spacing-wide:   0.025em;
  --letter-spacing-wider:  0.05em;
  --letter-spacing-widest: 0.1em;

  /* ── Spacing ── */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;
  --space-24:  6rem;
  --space-32:  8rem;

  /* ── Border Radius ── */
  --radius-sm:   0.25rem;
  --radius-base: 0.5rem;
  --radius-md:   0.75rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-2xl:  2rem;
  --radius-full: 9999px;

  /* ── Shadows ── */
  --shadow-sm:  0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-base:0 1px 3px 0 rgba(0,0,0,0.10), 0 1px 2px -1px rgba(0,0,0,0.10);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.10), 0 2px 4px -2px rgba(0,0,0,0.10);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.10), 0 4px 6px -4px rgba(0,0,0,0.10);
  --shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.10), 0 8px 10px -6px rgba(0,0,0,0.10);
  --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0,0,0,0.06);
  --shadow-colored: 0 8px 30px -4px rgba(var(--color-primary-rgb), 0.3);

  /* ── Transitions ── */
  --ease-in:     cubic-bezier(0.4, 0, 1, 1);
  --ease-out:    cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  --duration-fast:   150ms;
  --duration-base:   250ms;
  --duration-slow:   400ms;
  --duration-slower: 600ms;

  /* ── Layout ── */
  --container-sm:   640px;
  --container-md:   768px;
  --container-lg:   1024px;
  --container-xl:   1280px;
  --container-2xl:  1536px;
  --container-max:  1280px;

  --sidebar-width:    320px;
  --header-height:    72px;
  --header-height-sm: 56px;

  /* ── Z-Index ── */
  --z-below:    -1;
  --z-base:     1;
  --z-raised:   10;
  --z-dropdown: 100;
  --z-sticky:   200;
  --z-overlay:  300;
  --z-modal:    400;
  --z-toast:    500;
}

/* Dark Mode Tokens */
[data-theme="dark"] {
  --color-bg:           hsl(220, 20%, 10%);
  --color-surface:      hsl(220, 18%, 14%);
  --color-surface-2:    hsl(220, 16%, 18%);
  --color-border:       hsl(220, 15%, 22%);

  --color-text:         hsl(220, 15%, 92%);
  --color-text-muted:   hsl(220, 10%, 62%);
  --color-text-subtle:  hsl(220, 10%, 45%);

  --shadow-sm:   0 1px 2px 0 rgba(0,0,0,0.3);
  --shadow-base: 0 1px 3px 0 rgba(0,0,0,0.4), 0 1px 2px -1px rgba(0,0,0,0.4);
  --shadow-md:   0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.4);
  --shadow-lg:   0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.5);
  --shadow-xl:   0 20px 25px -5px rgba(0,0,0,0.5), 0 8px 10px -6px rgba(0,0,0,0.5);
}

/* ==========================================================================
   HOMEPAGE BLOG POSTS SECTION & CATEGORY FILTER SIDEBAR
   ========================================================================== */

.homepage-blog-section {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

/* Category Filter Widget and list */
.category-filter-widget {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
  z-index: 10;
}

.category-filter-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.category-filter-item {
  margin: 0;
  padding: 0;
}

.category-filter-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-base);
  color: var(--color-text);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  border-left: 3px solid transparent;
  background-color: transparent;
  transition: all var(--duration-base) var(--ease-in-out);
}

.category-filter-link:hover {
  background-color: var(--color-surface-2);
  border-left-color: var(--cat-color, var(--color-primary-light));
  color: var(--color-text);
  padding-left: 1.125rem;
}

.category-filter-link.is-active {
  background-color: var(--cat-color, var(--color-primary));
  color: var(--color-text-inverse) !important;
  border-left-color: var(--cat-color, var(--color-primary));
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.category-filter-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.75rem;
  height: 1.25rem;
  padding-inline: var(--space-1);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-full);
  background-color: var(--color-surface-2);
  color: var(--color-text-muted);
  transition: all var(--duration-base) var(--ease-in-out);
}

.category-filter-link:hover .category-filter-count {
  background-color: var(--color-border);
  color: var(--color-text);
}

.category-filter-link.is-active .category-filter-count {
  background-color: rgba(255, 255, 255, 0.25);
  color: var(--color-text-inverse);
}

/* Adjustments for the pagination on homepage */
.homepage-blog-section .pagination {
  margin-top: var(--space-8);
  display: flex;
  justify-content: center;
}

@media (max-width: 1024px) {
  .category-filter-widget {
    position: relative;
    top: 0;
  }
}