/*
Theme Name: TechRounder
Theme URI: https://techrounder.com
Author: TechRounder
Author URI: https://techrounder.com
Description: Ultra-modern, mobile-first WordPress theme with light/dark mode, SEO/AI optimization, and Core Web Vitals focus.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
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: techrounder
Tags: blog, custom-menu, featured-images, threaded-comments, translation-ready, one-column, two-columns
*/

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

:root {
  /* ── Colors: Light Theme (default) ── */
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-card: #ffffff;
  --color-bg-code: #f1f3f5;
  --color-bg-hover: #f0f4ff;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-border-light: #f0f0f0;

  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;
  --color-heading: #030712;

  --color-accent: #c71c1b;
  --color-accent-hover: #a51615;
  --color-accent-light: #fde8e8;
  --color-accent-bg: #fef2f2;

  --color-secondary: #aa46ff;
  --color-secondary-hover: #9333ea;
  --color-secondary-light: #f3e8ff;
  --color-secondary-bg: #faf5ff;

  --color-tertiary: #f96a00;
  --color-tertiary-hover: #e05e00;
  --color-tertiary-light: #fff3e0;
  --color-tertiary-bg: #fff8f0;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #06b6d4;

  /* ── Shadows ── */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, .05), 0 2px 4px rgba(0, 0, 0, .04);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, .06), 0 4px 6px rgba(0, 0, 0, .04);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, .08);

  /* ── Typography ── */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Space Grotesk', var(--font-sans);
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, 'Cascadia Code', Menlo, Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  --leading-tight: 1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* ── 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;

  /* ── Layout ── */
  --container-max: 1400px;
  --container-narrow: 768px;
  --container-wide: 1400px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* ── Transitions ── */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* ── Z-index ── */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --color-bg: #0a0a0a;
  --color-bg-alt: #111111;
  --color-bg-card: #141414;
  --color-bg-code: #1a1a1a;
  --color-bg-hover: #1a1f2e;
  --color-surface: #141414;
  --color-border: #222222;
  --color-border-light: #1a1a1a;

  --color-text: #e5e7eb;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  --color-heading: #f9fafb;

  --color-accent: #ef5350;
  --color-accent-hover: #f87171;
  --color-accent-light: #2a1515;
  --color-accent-bg: #1a0f0f;

  --color-secondary: #c084fc;
  --color-secondary-hover: #d8b4fe;
  --color-secondary-light: #1e1533;
  --color-secondary-bg: #150f22;

  --color-tertiary: #fb923c;
  --color-tertiary-hover: #fdba74;
  --color-tertiary-light: #2a1d0f;
  --color-tertiary-bg: #1a150a;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, .2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .3), 0 1px 2px rgba(0, 0, 0, .2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, .3), 0 2px 4px rgba(0, 0, 0, .2);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, .4), 0 4px 6px rgba(0, 0, 0, .2);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, .3);
}

/* ═══════════════════════════════════════════════════════
   CRITICAL STYLES — Inlined for first paint
   ═══════════════════════════════════════════════════════ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* ── Prevent FOUC for dark mode ── */
body.no-transition,
body.no-transition * {
  transition: none !important;
}

/* ── Container ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

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

/* ── Typography ── */
h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
}

h1 {
  font-size: var(--text-3xl);
}

h2 {
  font-size: var(--text-2xl);
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

/* ── Accessibility ── */
.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: var(--z-toast);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: var(--weight-semibold);
}

.skip-link:focus {
  top: var(--space-2);
}

/* ── Header (critical) ── */
.site-header {
  z-index: var(--z-sticky);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

/* Mobile header: menu(left) — logo(center) — theme(right) */
@media (max-width: 767px) {
  .site-header__inner {
    position: relative;
    justify-content: center;
  }

  .site-logo {
    text-align: center;
  }

  .header-actions {
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    pointer-events: none;
  }

  .header-actions>* {
    pointer-events: auto;
  }

  /* Reorder: menu button first (left), theme toggle last (right) */
  .mobile-menu-btn {
    order: -1;
  }
}

.site-logo {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-heading);
  letter-spacing: -0.02em;
}

.site-logo:hover {
  color: var(--color-accent);
}

.site-logo__img {
  height: 40px;
  width: auto;
  display: block;
}

[data-theme="dark"] .site-logo__img {
  filter: brightness(0) invert(1);
}

/* ── Nav ── */
.site-nav {
  display: none;
}

.site-nav__list {
  display: flex;
  list-style: none;
  gap: var(--space-1);
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link--active {
  color: var(--color-accent);
  background: var(--color-accent-bg);
}

.site-nav__link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ── Header Actions ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Header Tools (Search + Theme) ── */
.header-tools {
  position: relative;
  display: flex;
  align-items: center;
}

.header-tools-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-tools-toggle:hover,
.header-tools.is-open .header-tools-toggle {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.header-tools-toggle svg {
  width: 18px;
  height: 18px;
}

.header-tools-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  z-index: calc(var(--z-dropdown) + 5);
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-2);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.header-tools.is-open .header-tools-menu {
  display: flex;
}

/* ── Header Icon Buttons ── */
.theme-toggle,
.header-search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover,
.header-search-btn:hover,
.header-search-btn[aria-expanded="true"] {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.theme-toggle svg,
.header-search-btn svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

/* ── Mobile Menu Button ── */
.mobile-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 0;
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

.mobile-menu-btn .icon-close {
  display: none;
}

.mobile-menu-open .mobile-menu-btn .icon-menu {
  display: none;
}

.mobile-menu-open .mobile-menu-btn .icon-close {
  display: block;
}

/* ── Mobile Nav ── */
.mobile-nav {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-overlay);
  background: var(--color-bg);
  padding: var(--space-4);
  overflow-y: auto;
}

.mobile-menu-open .mobile-nav {
  display: block;
}

.mobile-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link--active {
  background: var(--color-accent-bg);
  color: var(--color-accent);
}

.mobile-nav__link svg {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
}

.mobile-nav__link:hover svg {
  color: var(--color-accent);
}

/* ── Header Search Modal ── */
.search-modal[hidden] {
  display: none !important;
}

.search-modal {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-modal) + 10);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(16px, 4vw, 32px);
  background: rgba(0, 0, 0, .58);
  backdrop-filter: blur(2px);
}

.search-modal__dialog {
  width: min(720px, 100%);
  margin-top: clamp(32px, 8vh, 96px);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-6);
}

.search-modal__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.search-modal__title {
  margin: 0;
  font-size: var(--text-xl);
}

.search-modal__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-modal__close:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-bg);
}

.search-modal__close svg {
  width: 18px;
  height: 18px;
}

.search-modal__form {
  display: flex;
  gap: var(--space-2);
}

.search-modal__input {
  flex: 1 1 auto;
  min-width: 0;
  height: 46px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-size: var(--text-base);
  outline: none;
}

.search-modal__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(199, 28, 27, .12);
}

.search-modal__submit {
  height: 46px;
  padding: 0 var(--space-5);
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.search-modal__submit:hover {
  background: var(--color-accent-hover);
}

@media (max-width: 767px) {
  .search-modal__dialog {
    padding: var(--space-4);
  }

  .search-modal__form {
    flex-direction: column;
  }

  .search-modal__submit {
    width: 100%;
  }
}

/* ── Responsive: Show desktop nav ── */
@media (min-width: 768px) {
  .site-nav {
    display: block;
  }

  .header-tools {
    position: static;
  }

  .header-tools-toggle {
    display: none;
  }

  .header-tools-menu {
    position: static;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .mobile-menu-btn {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }

  .site-header__inner {
    height: 64px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-6);
  }

  h1 {
    font-size: var(--text-4xl);
  }
}