/* ==========================================================================
   Modern Theme for Blog do Birner
   A clean, card-based design with improved typography and responsiveness
   ========================================================================== */

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #64748b;
    --color-accent: #0891b2;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-border-dark: #cbd5e1;

    /* Typography */
    --font-heading: 'PT Serif', Georgia, serif;
    --font-body: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;

    /* Layout */
    --max-width: 1200px;
    --header-height: 70px;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

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

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

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

a:hover {
    color: var(--color-primary-dark);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

/* Layout */
.site {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
}

/* Header */
.site-header {
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.site-header-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-branding .site-title {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
}

.site-branding .site-title a {
    color: var(--color-text);
    text-decoration: none;
}

.site-branding .site-title a:hover {
    color: var(--color-primary);
}

.site-description {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0;
}

/* Toggle Buttons */
.toggles {
    display: flex;
    gap: var(--spacing-xs);
}

.toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    transition: background-color var(--transition-fast);
}

.toggle:hover {
    background-color: var(--color-border);
}

.toggle.active {
    background-color: var(--color-primary);
    color: white;
}

.toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* Navigation Panels */
.panel {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    z-index: 99;
}

.panel.active {
    display: block;
}

#menu-toggle-nav {
    padding: var(--spacing-md);
}

.main-navigation .menu {
    list-style: none;
    display: flex;
    gap: var(--spacing-lg);
}

.main-navigation .menu li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.main-navigation .menu li a:hover {
    background-color: var(--color-background);
    color: var(--color-primary);
}

/* Search */
.search-wrapper {
    padding: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
}

.search-field {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-body);
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

.search-field:focus {
    outline: none;
    border-color: var(--color-primary);
}

.search-submit {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
    color: white;
}

/* Main Content Layout */
.content-area {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.site-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Article Cards */
article.post {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

article.post:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.entry-header {
    padding: var(--spacing-lg) var(--spacing-lg) 0;
}

.entry-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.entry-title a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.entry-title a:hover {
    color: var(--color-primary);
}

.entry-content {
    padding: var(--spacing-md) var(--spacing-lg);
}

.entry-content p {
    color: var(--color-text-light);
    line-height: 1.8;
}

.entry-content img {
    border-radius: var(--border-radius-sm);
    margin: var(--spacing-sm) 0;
}

.entry-content img.alignleft,
.entry-content img.alignright {
    max-width: 50%;
}

/* Entry Meta / Footer */
.entry-meta {
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.entry-meta .post-date,
.entry-meta .byline {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.entry-meta a {
    color: var(--color-text-light);
}

.entry-meta a:hover {
    color: var(--color-primary);
}

/* Sidebar Widgets */
.widget-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.widget {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.widget-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

.widget ul {
    list-style: none;
}

.widget ul li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.widget ul li:last-child {
    border-bottom: none;
}

.widget ul li a {
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.widget ul li a:hover {
    color: var(--color-primary);
    padding-left: var(--spacing-xs);
}

/* Search Widget */
.widget_search .search-form {
    flex-direction: column;
}

.widget_search .search-field {
    margin-bottom: var(--spacing-sm);
}

.widget_search .search-submit {
    width: 100%;
}

/* Footer */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xxl);
}

.site-info {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.site-info a {
    color: var(--color-text-light);
}

.site-info a:hover {
    color: var(--color-primary);
}

/* Secondary Navigation */
.secondary-navigation {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.secondary-navigation .menu {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.secondary-navigation .menu li a {
    color: var(--color-text-light);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: color var(--transition-fast);
}

.secondary-navigation .menu li a:hover {
    color: var(--color-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-area {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .widget-area {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .site-header-wrapper {
        padding: 0 var(--spacing-md);
    }

    .site-branding .site-title {
        font-size: 1.5rem;
    }

    .site-content {
        padding: var(--spacing-md);
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .entry-title {
        font-size: 1.5rem;
    }

    .entry-content img.alignleft,
    .entry-content img.alignright {
        max-width: 100%;
        float: none;
    }

    .main-navigation .menu {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .widget-area {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .entry-header,
    .entry-content,
    .entry-meta {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .toggles {
        gap: 0;
    }

    .toggle {
        padding: var(--spacing-xs);
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.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;
}

/* Smooth Animations */
@media (prefers-reduced-motion: no-preference) {
    .toggle,
    .post,
    .widget,
    .search-submit,
    .menu li a {
        transition: all var(--transition-normal);
    }
}

/* Focus States for Accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .widget-area,
    .toggles,
    .panel {
        display: none !important;
    }

    .site-content {
        padding: 0;
    }

    article.post {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}