/* Design System and Variables for voceprogramador.com.br */
:root {
    --bg-primary: #faf9fd; /* Surface Light */
    --bg-secondary: #ffffff; /* Surface Container Lowest */
    --bg-card: #ffffff;
    --border-color: #e9e7eb; /* Surface Container High */
    --border-color-high: #c2c6d5; /* Outline Variant */
    
    --text-primary: #1a1b1e; /* On Surface (Deep Slate) */
    --text-secondary: #424753; /* On Surface Variant */
    --text-muted: #727784; /* Outline */
    
    --color-primary: #004faa; /* Logic Blue */
    --color-primary-dark: #002f6c;
    --color-primary-glow: rgba(0, 79, 170, 0.12); /* Logic Blue tinted shadow */
    
    --color-secondary: #b71410; /* Action Red */
    --color-secondary-dark: #7e0c09;
    --color-secondary-glow: rgba(183, 20, 16, 0.12);
    
    --color-tertiary: #704b00; /* Innovation Yellow */
    --color-tertiary-bright: #F9AB00;
    --color-tertiary-glow: rgba(112, 75, 0, 0.12);
    
    --color-error: #ba1a1a;
    --color-success: #10b981;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-display: 'Montserrat', sans-serif;
    --font-mono: 'Fira Code', 'Cascadia Code', monospace;
    
    --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    
    --radius-sm: 0.125rem; /* 2px */
    --radius-md: 0.25rem;  /* 4px - Inputs/Buttons */
    --radius-lg: 0.5rem;   /* 8px - Cards */
}

/* Global resets & Typography */
html {
    height: 100%;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: #dbd9dd;
    border-radius: 4px;
    border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* Header & Glass Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.glass-nav {
    background: rgba(250, 249, 253, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 3px solid var(--color-primary); /* Logic Blue Accent */
    padding: 0.6rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    transition: var(--transition-smooth);
}

.glass-nav .nav-link {
    color: var(--text-secondary) !important;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.875rem; /* 14px label */
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md); /* 4px */
    transition: var(--transition-smooth);
}

.glass-nav .nav-link:hover {
    color: var(--color-primary) !important;
    background: rgba(0, 79, 170, 0.05);
}

.glass-nav .nav-item.active .nav-link {
    color: #ffffff !important;
    background: var(--color-primary);
    box-shadow: 2px 2px 0px 0px var(--color-primary-glow);
}

/* Layout container styling */
main {
    flex: 1;
    padding-top: 2rem;
    padding-bottom: 4rem;
}

/* Typography elements */
h1 {
    font-family: var(--font-display);
    font-size: 3rem; /* 48px */
    font-weight: 700;
    line-height: 3.5rem; /* 56px */
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h2 {
    font-family: var(--font-display);
    font-size: 2rem; /* 32px */
    font-weight: 700;
    line-height: 2.5rem; /* 40px */
    color: var(--text-primary);
}

h3 {
    font-family: var(--font-display);
    font-size: 1.5rem; /* 24px */
    font-weight: 600;
    line-height: 2rem; /* 32px */
    color: var(--text-primary);
}

h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    color: var(--text-primary);
}

/* Hero Section Specifics */
.gradient-title {
    color: var(--color-primary);
    position: relative;
    display: inline-block;
}

.gradient-title::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 5%;
    width: 90%;
    height: 5px;
    background: var(--color-tertiary-bright); /* Innovation Yellow Underline */
    border-radius: 2px;
}

/* Physical Block Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff !important;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.875rem; /* 14px label */
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md); /* 4px */
    border: none;
    border-bottom: 3px solid var(--color-primary-dark);
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 2px 2px 0px 0px rgba(0, 0, 0, 0.05);
    text-decoration: none;
}

.btn-primary:hover {
    background-color: #0056ba;
    transform: translateY(-1px);
    box-shadow: 3px 3px 0px 0px var(--color-primary-glow);
}

.btn-primary:active {
    transform: translateY(1px);
    border-bottom-width: 1px;
    margin-bottom: 2px;
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: #ffffff !important;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md); /* 4px */
    border: none;
    border-bottom: 3px solid var(--color-secondary-dark);
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 2px 2px 0px 0px rgba(0, 0, 0, 0.05);
    text-decoration: none;
}

.btn-secondary:hover {
    background-color: #cb1712;
    transform: translateY(-1px);
    box-shadow: 3px 3px 0px 0px var(--color-secondary-glow);
}

.btn-secondary:active {
    transform: translateY(1px);
    border-bottom-width: 1px;
    margin-bottom: 2px;
}

/* Categorized Tag Chips */
.tag-badge {
    font-family: var(--font-sans);
    font-size: 0.75rem; /* 12px label */
    font-weight: 600;
    padding: 0.3rem 0.65rem;
    border-radius: var(--radius-md); /* 4px */
    text-decoration: none;
    transition: var(--transition-smooth);
    display: inline-block;
    border: 1px solid transparent;
}

.tag-badge.tag-logic {
    background-color: #e6ecff;
    color: var(--color-primary);
    border-color: rgba(25, 103, 210, 0.15);
}

.tag-badge.tag-logic:hover, .tag-badge.tag-logic.active {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
    box-shadow: 3px 3px 0px 0px var(--color-primary-glow);
}

.tag-badge.tag-innovation {
    background-color: #ffe8cc;
    color: var(--color-tertiary);
    border-color: rgba(144, 97, 0, 0.15);
}

.tag-badge.tag-innovation:hover, .tag-badge.tag-innovation.active {
    background-color: var(--color-tertiary-bright);
    color: #ffffff;
    border-color: var(--color-tertiary-bright);
    box-shadow: 3px 3px 0px 0px var(--color-tertiary-glow);
}

.tag-badge.tag-action {
    background-color: #ffdad5;
    color: var(--color-secondary);
    border-color: rgba(183, 20, 16, 0.15);
}

.tag-badge.tag-action:hover, .tag-badge.tag-action.active {
    background-color: var(--color-secondary);
    color: #ffffff;
    border-color: var(--color-secondary);
    box-shadow: 3px 3px 0px 0px var(--color-secondary-glow);
}

/* Cards & Level 1 / Level 2 Design */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color); /* Level 1 outline */
    border-radius: var(--radius-lg); /* 8px for larger cards */
    transition: var(--transition-smooth);
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: none; /* Level 1 has no shadow */
}

/* Level 2 Interactive Shadow (45-degree angle blocks) */
.glass-card:hover {
    transform: translate(-3px, -3px);
    border-color: var(--color-primary);
    box-shadow: 4px 4px 0px 0px var(--color-primary-glow);
}

.card-img-container {
    position: relative;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
    background: #f4f3f7;
    border-bottom: 1px solid var(--border-color);
}

.card-img-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.glass-card:hover .card-img-container img {
    transform: scale(1.02);
}

.card-body-custom {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-metadata {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    gap: 1rem;
    align-items: center;
}

.card-title-custom {
    font-size: 1.25rem;
    line-height: 1.6rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.card-title-custom a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

.card-text-custom {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.5rem;
    margin-bottom: 1.25rem;
    flex: 1;
}

/* Sidebar and Widgets */
.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg); /* 8px */
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 700;
    border-bottom: 3px solid var(--color-tertiary-bright); /* Innovation Yellow under line */
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

/* Footer Section */
footer {
    background: var(--bg-secondary);
    border-top: 4px solid var(--color-primary); /* Core Logic Blue Top Line */
    padding: 3rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.02);
}

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

footer a:hover {
    color: var(--color-secondary);
}

/* Article Page Styling */
.article-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

.article-title {
    font-size: 2.5rem;
    line-height: 3rem;
    font-weight: 800;
    margin-top: 1rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .article-title {
        font-size: 2rem;
        line-height: 2.5rem;
    }
}

.article-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.article-hero-image {
    width: 100%;
    max-height: 480px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 4px 4px 0px 0px rgba(0, 79, 170, 0.05);
    margin-bottom: 2.5rem;
}

/* Reading Progress Indicator (Stacked blocks look) */
.reading-progress-container {
    width: 100%;
    height: 10px;
    background-color: #e9e7eb;
    border-radius: var(--radius-md); /* 4px */
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.reading-progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--color-primary);
    background-image: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 20px,
        rgba(0, 0, 0, 0.12) 20px,
        rgba(0, 0, 0, 0.12) 22px
    ); /* stacked modular blocks pattern */
    transition: width 0.1s ease-out;
}

/* Rich Markdown Content Styles */
.markdown-content {
    font-family: var(--font-sans);
    font-size: 1.125rem; /* body-lg 18px */
    line-height: 1.75rem; /* 28px */
    color: var(--text-primary);
}

.markdown-content p {
    margin-bottom: 1.5rem;
}

.markdown-content h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1.25rem;
    border-bottom: 3px solid var(--color-tertiary-bright); /* Yellow underline for H2s */
    padding-bottom: 0.5rem;
}

.markdown-content h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--color-primary); /* Blue headings for H3 */
}

.markdown-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 4px;
    transition: var(--transition-smooth);
    font-weight: 600;
}

.markdown-content a:hover {
    color: var(--color-secondary); /* Action Red on links hover */
}

.markdown-content blockquote {
    border-left: 6px solid var(--color-primary);
    padding: 0.5rem 0 0.5rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    background: #e6ecff; /* Light primary background */
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
}

.markdown-content ul, .markdown-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.markdown-content li {
    margin-bottom: 0.5rem;
}

/* Code block styles */
.markdown-content pre {
    background-color: #1a1b1e; /* On-surface deep black background for code */
    border: 1px solid var(--border-color-high);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    overflow-x: auto;
    margin: 1.75rem 0;
    box-shadow: 3px 3px 0px 0px rgba(0, 0, 0, 0.05);
}

.markdown-content code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    background-color: #efedf1; /* surface container */
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    color: var(--color-secondary); /* Action Red inline code */
    font-weight: 500;
}

.markdown-content pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    color: #efedf1;
    display: block;
}

/* Markdown table styles */
.markdown-content table {
    width: 100%;
    margin-bottom: 1.5rem;
    border-collapse: collapse;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.markdown-content th {
    background-color: var(--color-primary);
    color: #ffffff;
    font-weight: 600;
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    text-align: left;
}

.markdown-content td {
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    color: var(--text-secondary);
    background-color: #ffffff;
}

.markdown-content tr:nth-child(even) td {
    background-color: #f4f3f7;
}

/* Horizontal Rule */
.markdown-content hr {
    border: 0;
    height: 3px;
    background: var(--border-color);
    margin: 2.5rem 0;
}

/* Form input custom styles */
.search-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color-high);
    color: var(--text-primary);
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius-md); /* 4px */
    font-size: 0.875rem;
    width: 100%;
    transition: var(--transition-smooth);
}

.search-input:focus {
    border: 2px solid var(--color-primary);
    padding: calc(0.6rem - 1px) calc(0.9rem - 1px); /* offsets 2px focus border to avoid jumping layouts */
    outline: none;
}

/* Back button */
.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-family: var(--font-display);
    transition: var(--transition-smooth);
    margin-bottom: 2rem;
}

.btn-back:hover {
    color: var(--color-primary);
    transform: translateX(-4px);
}