/*
Theme Name: ProzentHilfe
Theme URI: https://prozenthilfe.de/
Author: ProzentHilfe
Author URI: https://prozenthilfe.de/
Description: Professional German Percentage Calculator WordPress Theme. Lightning-fast, SEO-optimized, WCAG 2.2 AA accessible. Built for ProzentHilfe.de with smart percentage calculators, educational content, and a modern mobile-first design.
Version: 1.5.1
Requires at least: 6.0
Tested up to: 7.0
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: prozenthilfe
Tags: custom-logo, custom-menu, featured-images, translation-ready, threaded-comments, footer-widgets, custom-colors
*/

/* =========================================================
   DESIGN TOKENS — CSS Custom Properties
   ========================================================= */
:root {
    /* Brand Colors */
    --ph-blue:         #2563eb;
    --ph-blue-dark:    #1d4ed8;
    --ph-blue-light:   #dbeafe;
    --ph-blue-50:      #eff6ff;
    --ph-green:        #16a34a;
    --ph-green-light:  #dcfce7;
    --ph-red:          #dc2626;
    --ph-red-light:    #fee2e2;
    --ph-yellow:       #ca8a04;
    --ph-yellow-light: #fefce8;

    /* Neutral Palette */
    --ph-white:        #ffffff;
    --ph-gray-50:      #f9fafb;
    --ph-gray-100:     #f3f4f6;
    --ph-gray-200:     #e5e7eb;
    --ph-gray-300:     #d1d5db;
    --ph-gray-400:     #9ca3af;
    --ph-gray-500:     #6b7280;
    --ph-gray-600:     #4b5563;
    --ph-gray-700:     #374151;
    --ph-gray-800:     #1f2937;
    --ph-gray-900:     #111827;

    /* Semantic Colors — Light Mode */
    --color-bg:            var(--ph-white);
    --color-bg-alt:        var(--ph-gray-50);
    --color-bg-card:       var(--ph-white);
    --color-bg-hero:       var(--ph-blue-50);
    --color-primary:       var(--ph-blue);
    --color-primary-dark:  var(--ph-blue-dark);
    --color-primary-light: var(--ph-blue-light);
    --color-success:       var(--ph-green);
    --color-success-light: var(--ph-green-light);
    --color-danger:        var(--ph-red);
    --color-danger-light:  var(--ph-red-light);
    --color-warning:       var(--ph-yellow);
    --color-warning-light: var(--ph-yellow-light);
    --color-text:          var(--ph-gray-900);
    --color-text-muted:    var(--ph-gray-500);
    --color-text-light:    var(--ph-gray-400);
    --color-border:        var(--ph-gray-200);
    --color-border-dark:   var(--ph-gray-300);
    --color-edu-bg:        #eff6ff;
    --color-edu-border:    #bfdbfe;
    --color-edu-text:      #1e40af;
    --color-header-bg:     rgba(255,255,255,0.95);
    --color-shadow:        rgba(0,0,0,0.08);
    --color-shadow-lg:     rgba(0,0,0,0.15);

    /* Typography */
    --font-sans:     'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono:     'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    --font-size-xs:  0.75rem;
    --font-size-sm:  0.875rem;
    --font-size-base:1rem;
    --font-size-lg:  1.125rem;
    --font-size-xl:  1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --line-height-tight:  1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed:1.75;

    /* 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;

    /* Layout */
    --container-max:  1200px;
    --container-pad:  1.5rem;
    --header-height:  4rem;
    --radius-sm:      0.25rem;
    --radius:         0.5rem;
    --radius-lg:      0.75rem;
    --radius-xl:      1rem;
    --radius-2xl:     1.5rem;
    --radius-full:    9999px;

    /* Transitions */
    --transition:     150ms ease;
    --transition-md:  250ms ease;

    /* Shadows */
    --shadow-sm:  0 1px 2px var(--color-shadow);
    --shadow:     0 1px 3px var(--color-shadow), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md:  0 4px 6px var(--color-shadow), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg:  0 10px 15px var(--color-shadow-lg), 0 4px 6px rgba(0,0,0,0.07);
    --shadow-xl:  0 20px 25px var(--color-shadow-lg), 0 8px 10px rgba(0,0,0,0.06);
}

/* Dark Mode */
[data-theme="dark"],
.dark-mode {
    --color-bg:            #0f172a;
    --color-bg-alt:        #1e293b;
    --color-bg-card:       #1e293b;
    --color-bg-hero:       #1e293b;
    --color-primary:       #60a5fa;
    --color-primary-dark:  #93c5fd;
    --color-primary-light: #1e3a5f;
    --color-success:       #4ade80;
    --color-success-light: #14532d;
    --color-danger:        #f87171;
    --color-danger-light:  #450a0a;
    --color-text:          #f1f5f9;
    --color-text-muted:    #94a3b8;
    --color-text-light:    #64748b;
    --color-border:        #334155;
    --color-border-dark:   #475569;
    --color-edu-bg:        #1e3a5f;
    --color-edu-border:    #2563eb;
    --color-edu-text:      #93c5fd;
    --color-header-bg:     rgba(15,23,42,0.95);
    --color-shadow:        rgba(0,0,0,0.3);
    --color-shadow-lg:     rgba(0,0,0,0.5);
}

/* =========================================================
   CSS RESET & BASE
   ========================================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-md), color var(--transition-md);
}

img, video, svg { display: block; max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}
p { line-height: var(--line-height-relaxed); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }
table { border-collapse: collapse; width: 100%; }

/* Accessibility — Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    background: var(--color-primary);
    color: #fff;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius);
    font-weight: 600;
    z-index: 9999;
    transition: top var(--transition);
}
.skip-link:focus { top: var(--space-4); }

/* Screen Reader Only */
.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;
}

/* =========================================================
   LAYOUT
   ========================================================= */
.ph-container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-pad);
}

.site-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content { flex: 1; }

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background-color var(--transition-md), border-color var(--transition-md);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--transition);
}
.site-logo:hover { color: var(--color-text); opacity: 0.85; }
.site-logo img {
    width: 2rem;
    height: 2rem;
    border-radius: var(--radius);
}
.site-logo .custom-logo-link {
    display: flex;
    align-items: center;
}
.site-logo .custom-logo {
    width: auto;
    height: 2.5rem;
    max-width: 220px;
    object-fit: contain;
    border-radius: 0;
}
@media (max-width: 767px) {
    .site-logo .custom-logo {
        height: 2rem;
        max-width: 160px;
    }
}
.site-logo__text { color: var(--color-text); }

/* Primary Nav */
.primary-nav { display: none; }
@media (min-width: 768px) {
    .primary-nav {
        display: flex;
        align-items: center;
        gap: var(--space-6);
    }
}

.primary-nav a,
.primary-nav .nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    padding: var(--space-2) var(--space-1);
    border-radius: var(--radius-sm);
    transition: color var(--transition);
    position: relative;
}
.primary-nav a:hover,
.primary-nav a.current-menu-item,
.primary-nav a.current_page_item {
    color: var(--color-primary);
}
.primary-nav a.current-menu-item::after,
.primary-nav a.current_page_item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

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

/* Theme Toggle Button */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: transparent;
    color: var(--color-text-muted);
    transition: all var(--transition);
    cursor: pointer;
}
.theme-toggle:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}
.theme-toggle svg { width: 1.125rem; height: 1.125rem; }
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: transparent;
    color: var(--color-text-muted);
    transition: all var(--transition);
}
.mobile-menu-toggle:hover { background: var(--color-bg-alt); }
@media (min-width: 768px) { .mobile-menu-toggle { display: none; } }

/* Mobile Nav Drawer */
.mobile-nav {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--header-height);
    z-index: 99;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding: var(--space-6);
    overflow-y: auto;
}
.mobile-nav.is-open { display: flex; flex-direction: column; gap: var(--space-3); }
.mobile-nav a {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: all var(--transition);
    text-decoration: none;
}
.mobile-nav a:hover,
.mobile-nav a.current-menu-item {
    background: var(--color-bg-alt);
    border-color: var(--color-border);
    color: var(--color-primary);
}
@media (min-width: 768px) { .mobile-nav { display: none !important; } }

/* =========================================================
   HERO SECTION
   ========================================================= */
.hero-section {
    padding: var(--space-16) 0 var(--space-20);
    background: linear-gradient(180deg, var(--color-bg-hero) 0%, var(--color-bg) 100%);
}
.hero-section__heading {
    text-align: center;
    margin-bottom: var(--space-10);
}
.hero-section__title {
    font-size: clamp(1.875rem, 4vw, 3rem);
    font-weight: 800;
    line-height: var(--line-height-tight);
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}
.hero-section__title span { color: var(--color-primary); }
.hero-section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 42rem;
    margin-inline: auto;
    line-height: var(--line-height-relaxed);
}

/* =========================================================
   CALCULATOR CARD
   ========================================================= */
.calculator-card {
    max-width: 38rem;
    margin-inline: auto;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

/* Tabs */
.calc-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-1);
    gap: var(--space-1);
}
.calc-tab-btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-muted);
    background: transparent;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    white-space: nowrap;
}
.calc-tab-btn:hover { color: var(--color-text); background: var(--color-bg-card); }
.calc-tab-btn.is-active {
    color: var(--color-primary);
    background: var(--color-bg-card);
    box-shadow: var(--shadow-sm);
}
@media (max-width: 400px) {
    .calc-tabs { grid-template-columns: repeat(2, 1fr); }
}

.calc-body { padding: var(--space-6); }

.calc-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-5);
}
.calc-description strong { color: var(--color-text); }

/* Panels */
.calc-panel { display: none; }
.calc-panel.is-active { display: block; }

.calc-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-5);
}
@media (max-width: 360px) { .calc-fields { grid-template-columns: 1fr; } }

.calc-field label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}
.calc-field input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.calc-field input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
    background: var(--color-bg-card);
}
.calc-field input::placeholder { color: var(--color-text-light); font-size: var(--font-size-base); }
.calc-field input[aria-invalid="true"] {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.14);
}

/* Result Display */
.calc-result {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-5);
    margin-bottom: var(--space-4);
}
.calc-result__label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2);
}
.calc-result__label span {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted);
}
.calc-copy-btn {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.calc-copy-btn:hover { background: var(--color-bg-alt); color: var(--color-text); }
.calc-copy-btn svg { width: 0.875rem; height: 0.875rem; }

.calc-result__value {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: all var(--transition-md);
    min-height: 4rem;
}
.calc-result__value.has-result-success {
    background: var(--color-success-light);
    border-color: rgba(22,163,74,0.3);
}
.calc-result__value.has-result-danger {
    background: var(--color-danger-light);
    border-color: rgba(220,38,38,0.3);
}
.calc-result__number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-text-muted);
    letter-spacing: -0.02em;
}
.calc-result__number.is-success { color: var(--color-success); }
.calc-result__number.is-danger  { color: var(--color-danger); }
.calc-result__icon svg { width: 1.5rem; height: 1.5rem; }
.calc-result__icon.is-success svg { color: var(--color-success); }
.calc-result__icon.is-danger  svg { color: var(--color-danger); }

.calc-promille-hint {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-3);
}
.calc-promille-hint svg { width: 1rem; height: 1rem; color: var(--color-primary); flex-shrink: 0; }

/* Rechenweg (Calculation Steps) */
.rechenweg {
    background: var(--color-edu-bg);
    border: 1px solid var(--color-edu-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
}
.rechenweg__header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}
.rechenweg__header svg { width: 1rem; height: 1rem; color: var(--color-primary); }
.rechenweg__header h3 {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-edu-text);
}
.rechenweg__formula {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-edu-text);
    margin-bottom: var(--space-2);
}
.rechenweg__steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}
.rechenweg__steps li {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    padding-left: var(--space-4);
    position: relative;
}
.rechenweg__steps li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* =========================================================
   SECTION STYLES
   ========================================================= */
.ph-section { padding: var(--space-16) 0; }
.ph-section--alt { background: var(--color-bg-alt); }
.ph-section--border { border-top: 1px solid var(--color-border); }

.ph-section__header {
    text-align: center;
    max-width: 48rem;
    margin-inline: auto;
    margin-bottom: var(--space-12);
}
.ph-section__eyebrow {
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}
.ph-section__title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 800;
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}
.ph-section__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* =========================================================
   USE CASE CARDS
   ========================================================= */
.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}
.use-case-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-md);
    text-decoration: none;
    color: inherit;
    display: block;
}
.use-case-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    color: inherit;
}
.use-case-card__icon {
    width: 3rem;
    height: 3rem;
    background: var(--color-primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    font-size: 1.5rem;
}
.use-case-card__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-2);
}
.use-case-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
}
.use-case-card__link {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}
.use-case-card__link svg { width: 1rem; height: 1rem; transition: transform var(--transition); }
.use-case-card:hover .use-case-card__link svg { transform: translateX(3px); }

/* =========================================================
   FORMULA TABLE
   ========================================================= */
.formula-table-wrap {
    overflow-x: auto;
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
}
.formula-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-bg-card);
}
.formula-table thead {
    background: var(--color-bg-alt);
}
.formula-table th {
    padding: var(--space-4) var(--space-5);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text);
    white-space: nowrap;
    border-bottom: 1px solid var(--color-border);
}
.formula-table td {
    padding: var(--space-4) var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}
.formula-table tr:last-child td { border-bottom: none; }
.formula-table tr:hover td { background: var(--color-bg-alt); }
.formula-table code {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    background: var(--color-bg-alt);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    white-space: nowrap;
}

/* =========================================================
   FAQ ACCORDION
   ========================================================= */
.faq-list { display: flex; flex-direction: column; gap: var(--space-3); }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-card);
    overflow: hidden;
    transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--color-border-dark); }
.faq-item.is-open { border-color: var(--color-primary); }
.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6);
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    transition: all var(--transition);
}
.faq-question:hover { background: var(--color-bg-alt); }
.faq-chevron {
    width: 0.5rem;
    height: 0.5rem;
    flex-shrink: 0;
    border-right: 2px solid var(--color-text-muted);
    border-bottom: 2px solid var(--color-text-muted);
    transform: rotate(45deg);
    transition: transform var(--transition-md), border-color var(--transition-md);
}
.faq-item.is-open .faq-chevron { transform: rotate(-135deg); border-color: var(--color-primary); }
.faq-answer {
    display: none;
    padding: 0 var(--space-6) var(--space-5);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}
.faq-item.is-open .faq-answer { display: block; }

/* =========================================================
   BLOG GRID
   ========================================================= */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}
.blog-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-md);
    text-decoration: none;
    color: inherit;
}
.blog-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    color: inherit;
}
.blog-card__thumbnail {
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg-alt);
    position: relative;
}
.blog-card__thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-md);
}
.blog-card:hover .blog-card__thumbnail img { transform: scale(1.03); }
.blog-card__thumbnail-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-hero));
}
.blog-card__body { padding: var(--space-6); flex: 1; display: flex; flex-direction: column; }
.blog-card__category {
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}
.blog-card__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-tight);
    flex: 1;
}
.blog-card__excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.blog-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.blog-card__read-more {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}
.blog-card__read-more svg { width: 0.875rem; height: 0.875rem; }

/* =========================================================
   SINGLE POST / BLOG LAYOUT
   ========================================================= */
.blog-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-10);
    padding-block: var(--space-12);
}
@media (min-width: 1024px) {
    .blog-layout { grid-template-columns: 1fr 320px; }
}
.blog-main { min-width: 0; }
.blog-sidebar { display: flex; flex-direction: column; gap: var(--space-6); min-width: 0; }

/* Article */
.article-header { margin-bottom: var(--space-8); }
.article-category {
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: var(--space-3);
}
.article-title {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    line-height: var(--line-height-tight);
    color: var(--color-text);
    margin-bottom: var(--space-4);
}
.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}
.article-meta span { display: flex; align-items: center; gap: var(--space-1); }
.article-meta svg { width: 1rem; height: 1rem; }
.article-excerpt {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
    padding: var(--space-4) var(--space-6);
    border-left: 4px solid var(--color-primary);
    background: var(--color-bg-alt);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin-bottom: var(--space-8);
}

/* Article Content */
.article-content { line-height: var(--line-height-relaxed); overflow-wrap: anywhere; word-break: break-word; }
.article-content h2 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-text);
    margin-top: var(--space-10);
    margin-bottom: var(--space-4);
    scroll-margin-top: calc(var(--header-height) + var(--space-4));
}
.article-content h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin-top: var(--space-8);
    margin-bottom: var(--space-3);
    scroll-margin-top: calc(var(--header-height) + var(--space-4));
}
.article-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-top: var(--space-6);
    margin-bottom: var(--space-3);
}
.article-content p { margin-bottom: var(--space-5); }
.article-content ul,
.article-content ol {
    margin-bottom: var(--space-5);
    padding-left: var(--space-6);
}
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: var(--space-2); line-height: var(--line-height-relaxed); }
.article-content a { font-weight: 500; text-decoration: underline; }
.article-content a:hover { text-decoration: none; }
.article-content strong { font-weight: 700; }
.article-content em { font-style: italic; }
.article-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding: var(--space-4) var(--space-6);
    background: var(--color-bg-alt);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    font-style: italic;
    color: var(--color-text-muted);
    margin-block: var(--space-6);
}
.article-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--color-bg-alt);
    padding: 2px var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
}
.article-content pre {
    background: var(--color-gray-900, #111827);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    overflow-x: auto;
    margin-block: var(--space-6);
}
.article-content pre code {
    background: none;
    color: #e5e7eb;
    padding: 0;
    font-size: var(--font-size-sm);
}
.article-content table {
    margin-block: var(--space-6);
    overflow-x: auto;
    display: block;
}
.article-content th { font-weight: 700; background: var(--color-bg-alt); }
.article-content th,
.article-content td { padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); }
.article-content img {
    border-radius: var(--radius-lg);
    margin-block: var(--space-6);
}

/* Info/Warning/Success Boxes */
.info-box {
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    margin-bottom: var(--space-5);
    display: flex;
    gap: var(--space-3);
    align-items: flex-start;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}
.info-box--info    { background: var(--color-edu-bg); border: 1px solid var(--color-edu-border); color: var(--color-edu-text); }
.info-box--warning { background: var(--color-warning-light); border: 1px solid rgba(202,138,4,0.3); color: #92400e; }
.info-box--success { background: var(--color-success-light); border: 1px solid rgba(22,163,74,0.3); color: #14532d; }
[data-theme="dark"] .info-box--warning { color: #000000; }
[data-theme="dark"] .info-box--success { color: #a7f3d0; }
.info-box svg { width: 1.125rem; height: 1.125rem; flex-shrink: 0; margin-top: 1px; }

/* Code Block with Copy */
.code-block-wrap {
    position: relative;
    margin-bottom: var(--space-4);
}
.code-block {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    padding-right: var(--space-12);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    overflow-x: auto;
    white-space: nowrap;
}
.code-block__desc {
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    white-space: normal;
}
.code-block__copy {
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text-muted);
    transition: all var(--transition);
    cursor: pointer;
    opacity: 0;
}
.code-block-wrap:hover .code-block__copy { opacity: 1; }
.code-block__copy:hover { color: var(--color-text); border-color: var(--color-border-dark); }
.code-block__copy svg { width: 0.875rem; height: 0.875rem; }

/* =========================================================
   BREADCRUMBS
   ========================================================= */
.breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    padding-block: var(--space-4);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-8);
}
.breadcrumbs a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs__sep { color: var(--color-text-light); }
.breadcrumbs .current { color: var(--color-text); font-weight: 500; }

/* =========================================================
   SIDEBAR WIDGETS
   ========================================================= */
.sidebar-widget {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}
.sidebar-widget__title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}
.sidebar-widget ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.sidebar-widget ul li a {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.sidebar-widget ul li a:hover { color: var(--color-primary); background: var(--color-bg-alt); }
.sidebar-widget ul li a::before { content: '→'; color: var(--color-primary); font-size: var(--font-size-xs); }

/* Related Content */
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-4);
    margin-top: var(--space-6);
}
.related-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}
.related-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    color: inherit;
}
.related-card__icon { font-size: 1.5rem; }
.related-card__title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}
.related-card__desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-16);
    padding-bottom: var(--space-8);
}
.site-footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-10);
}
@media (min-width: 640px) { .site-footer__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .site-footer__grid { grid-template-columns: 2fr 1fr 1fr; } }

.footer-brand__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-4);
    text-decoration: none;
}
.footer-brand__logo img { width: 2rem; height: 2rem; border-radius: var(--radius); }
.footer-brand__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
    max-width: 22rem;
}

.footer-nav__title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.footer-nav ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.footer-nav ul li a {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}
.footer-nav ul li a:hover { color: var(--color-primary); }

.site-footer__bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
}

/* =========================================================
   BUTTONS
   ========================================================= */
.ph-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
}
.ph-btn--primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.ph-btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
    box-shadow: 0 4px 12px rgba(37,99,235,0.4);
}
.ph-btn--outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.ph-btn--outline:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.ph-btn--ghost {
    background: transparent;
    color: var(--color-text-muted);
    border-color: transparent;
}
.ph-btn--ghost:hover { background: var(--color-bg-alt); color: var(--color-text); }

/* =========================================================
   BADGES / TAGS
   ========================================================= */
.ph-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* =========================================================
   STAT BOXES
   ========================================================= */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-6);
}
.stat-box {
    text-align: center;
    padding: var(--space-6);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}
.stat-box__number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-2);
}
.stat-box__label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* =========================================================
   404 PAGE
   ========================================================= */
.page-404 {
    padding: var(--space-24) 0;
    text-align: center;
}
.page-404__number {
    font-size: clamp(5rem, 15vw, 10rem);
    font-weight: 900;
    line-height: 1;
    color: var(--color-primary);
    opacity: 0.15;
    margin-bottom: var(--space-4);
}
.page-404__title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}
.page-404__desc {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 32rem;
    margin-inline: auto;
    margin-bottom: var(--space-8);
}

/* =========================================================
   SEARCH FORM
   ========================================================= */
.search-form {
    display: flex;
    gap: var(--space-2);
    width: 100%;
    max-width: 28rem;
}
.search-form input {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition);
}
.search-form input:focus { border-color: var(--color-primary); }
.search-form button {
    padding: var(--space-3) var(--space-4);
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.search-form button:hover { background: var(--color-primary-dark); }
.search-form button svg { width: 1rem; height: 1rem; }

/* =========================================================
   PAGINATION
   ========================================================= */
.ph-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-10);
    flex-wrap: wrap;
}
.ph-pagination a,
.ph-pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    text-decoration: none;
    transition: all var(--transition);
}
.ph-pagination a:hover { border-color: var(--color-primary); color: var(--color-primary); }
.ph-pagination span.current {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}
.ph-pagination a.prev, .ph-pagination a.next { width: auto; padding-inline: var(--space-4); }

/* =========================================================
   BACK TO TOP
   ========================================================= */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 2.75rem;
    height: 2.75rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-md);
    z-index: 50;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-primary-dark); box-shadow: var(--shadow-xl); }
.back-to-top svg { width: 1.125rem; height: 1.125rem; }

/* =========================================================
   ANIMATIONS
   ========================================================= */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}
.animate-fade-in   { animation: fadeInUp 0.4s ease forwards; }
.animate-scale-in  { animation: scaleIn 0.3s ease forwards; }

/* =========================================================
   UTILITIES
   ========================================================= */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary) !important; }
.font-bold { font-weight: 700; }
.font-mono { font-family: var(--font-mono); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

/* =========================================================
   WORDPRESS CORE CLASSES
   ========================================================= */
.alignleft  { float: left; margin-right: var(--space-6); margin-bottom: var(--space-4); }
.alignright { float: right; margin-left: var(--space-6); margin-bottom: var(--space-4); }
.aligncenter { display: block; margin-inline: auto; margin-bottom: var(--space-6); }
.wp-block-image { margin-block: var(--space-6); }
.wp-block-image img { border-radius: var(--radius-lg); }
.wp-caption { max-width: 100%; }
.wp-caption-text { font-size: var(--font-size-sm); color: var(--color-text-muted); text-align: center; margin-top: var(--space-2); }
.sticky { position: sticky; top: calc(var(--header-height) + var(--space-4)); }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-4); }
.gallery-item { overflow: hidden; border-radius: var(--radius); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-md); }
.gallery-item:hover img { transform: scale(1.05); }

/* =========================================================
   PRINT STYLES
   ========================================================= */
@media print {
    .site-header, .site-footer, .back-to-top, .primary-nav, .breadcrumbs { display: none; }
    .article-content { max-width: 100%; }
    a[href]::after { content: " (" attr(href) ")"; }
}