/*
Theme Name: RKDATAHUB
Theme URI: https://rkdatahub.com
Author: RKDATAHUB
Author URI: https://rkdatahub.com
Description: Premium WordPress theme for RKDATAHUB — an educational platform, digital marketplace, blog, and Microsoft Office certification study materials store. Fully customizable through the WordPress Customizer with no code editing required. Built for WooCommerce, lightweight, SEO-friendly, and mobile-responsive.
Version: 1.0.0
Requires at least: 6.4
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: rkdatahub
Tags: e-commerce, education, blog, custom-colors, custom-logo, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ==========================================================================
   1. CSS CUSTOM PROPERTIES — BRAND DESIGN TOKENS
   These are the single source of truth for color and type.
   The Customizer writes inline overrides to these same variable names
   (see inc/customizer/panel-global.php), so changing a color in
   wp-admin updates the entire site instantly with zero template edits.
   ========================================================================== */

:root {
  /* Brand colors */
  --rk-color-primary: #0B2545;       /* Dark Blue */
  --rk-color-secondary: #107C41;     /* Excel Green */
  --rk-color-accent: #F4B400;        /* Gold */
  --rk-color-background: #FFFFFF;    /* Pure White */
  --rk-color-card-bg: #F8F9FA;       /* Light Grey */

  /* Derived / functional colors */
  --rk-color-text: #1A1A1A;
  --rk-color-text-muted: #5C6670;
  --rk-color-text-on-primary: #FFFFFF;
  --rk-color-border: #E3E6EA;
  --rk-color-success: #107C41;
  --rk-color-error: #C0392B;
  --rk-color-link: #0B2545;
  --rk-color-link-hover: #F4B400;

  /* Typography */
  --rk-font-base: 'Inter', 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  --rk-font-heading: 'Inter', 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  --rk-font-size-base: 16px;
  --rk-line-height-base: 1.6;

  /* Spacing scale */
  --rk-space-xs: 0.5rem;
  --rk-space-sm: 1rem;
  --rk-space-md: 1.5rem;
  --rk-space-lg: 2.5rem;
  --rk-space-xl: 4rem;
  --rk-space-2xl: 6rem;

  /* Layout */
  --rk-container-width: 1280px;
  --rk-radius-sm: 6px;
  --rk-radius-md: 12px;
  --rk-radius-lg: 20px;
  --rk-shadow-sm: 0 1px 3px rgba(11, 37, 69, 0.08);
  --rk-shadow-md: 0 4px 16px rgba(11, 37, 69, 0.10);
  --rk-shadow-lg: 0 12px 32px rgba(11, 37, 69, 0.14);

  /* Transitions */
  --rk-transition-fast: 150ms ease;
  --rk-transition-base: 250ms ease;
}

/* ==========================================================================
   2. BASE RESET
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--rk-font-base);
  font-size: var(--rk-font-size-base);
  line-height: var(--rk-line-height-base);
  color: var(--rk-color-text);
  background-color: var(--rk-color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--rk-color-link);
  text-decoration: none;
  transition: color var(--rk-transition-fast);
}

a:hover,
a:focus {
  color: var(--rk-color-link-hover);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--rk-font-heading);
  color: var(--rk-color-primary);
  line-height: 1.25;
  margin: 0 0 var(--rk-space-sm);
  font-weight: 700;
}

p {
  margin: 0 0 var(--rk-space-sm);
}

ul, ol {
  padding-left: 1.25rem;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   3. LAYOUT PRIMITIVES
   ========================================================================== */

.rk-container {
  width: 100%;
  max-width: var(--rk-container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--rk-space-sm);
  padding-right: var(--rk-space-sm);
}

.rk-section {
  padding-top: var(--rk-space-2xl);
  padding-bottom: var(--rk-space-2xl);
}

.rk-section--card-bg {
  background-color: var(--rk-color-card-bg);
}

.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute !important;
  width: 1px;
  word-wrap: normal !important;
}

/* ==========================================================================
   4. BUTTON COMPONENTS
   ========================================================================== */

.rk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--rk-radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--rk-transition-base);
  line-height: 1.2;
}

.rk-btn--primary {
  background-color: var(--rk-color-primary);
  color: var(--rk-color-text-on-primary);
}

.rk-btn--primary:hover,
.rk-btn--primary:focus {
  background-color: #08182f;
  color: var(--rk-color-text-on-primary);
}

.rk-btn--accent {
  background-color: var(--rk-color-accent);
  color: var(--rk-color-primary);
}

.rk-btn--accent:hover,
.rk-btn--accent:focus {
  background-color: #d99e00;
  color: var(--rk-color-primary);
}

.rk-btn--outline {
  background-color: transparent;
  border-color: var(--rk-color-primary);
  color: var(--rk-color-primary);
}

.rk-btn--outline:hover,
.rk-btn--outline:focus {
  background-color: var(--rk-color-primary);
  color: var(--rk-color-text-on-primary);
}

/* ==========================================================================
   5. CARD COMPONENT
   ========================================================================== */

.rk-card {
  background-color: var(--rk-color-card-bg);
  border-radius: var(--rk-radius-md);
  padding: var(--rk-space-md);
  box-shadow: var(--rk-shadow-sm);
  transition: box-shadow var(--rk-transition-base), transform var(--rk-transition-base);
}

.rk-card:hover {
  box-shadow: var(--rk-shadow-md);
  transform: translateY(-3px);
}

/* ==========================================================================
   6. RESPONSIVE BREAKPOINTS (mobile-first base already applied above)
   ========================================================================== */

@media (max-width: 782px) {
  :root {
    --rk-space-2xl: 3rem;
    --rk-space-xl: 2.5rem;
  }

  .rk-container {
    padding-left: var(--rk-space-sm);
    padding-right: var(--rk-space-sm);
  }
}