/* ═══════════════════════════════════════════════
   DESIGN SYSTEM - PORTAL DE MATERIAL DIDÁTICO
   
   Palette:
   - Void:    #06080f  (Deep background)
   - Surface: #0f1318  (Sidebar and cards)
   - Slate:   #1c2028  (Borders, dividers)
   - Muted:   #72798f  (Captions, meta text)
   - Soft:    #9aa0b0  (Body text)
   - Bright:  #eaecf2  (Headers)
   - Accent:  #0084ff  (Active links, buttons)
   - Accent-2:#6c3cff  (Highlights, secondary accent)
   
   Typography:
   - Display: 'Space Grotesk'
   - Body:    'Inter'
   - Code:    'JetBrains Mono'
═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

:root {
    --void: #06080f;
    --surface: #0f1318;
    --slate: #1c2028;
    --muted: #72798f;
    --soft: #9aa0b0;
    --bright: #eaecf2;
    --accent: #0084ff;
    --accent-2: #6c3cff;
    
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

body {
    background-color: var(--void);
    color: var(--soft);
    font-family: var(--font-body);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
    overflow-x: hidden;
}

/* --- Layout Estrutural --- */
.sidebar {
    width: 320px;
    background-color: var(--surface);
    border-right: 1px solid var(--slate);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
    z-index: 10;
}

.main-content {
    margin-left: 320px;
    flex-grow: 1;
    padding: 3rem 4rem;
    max-width: 1000px;
}

/* --- Sidebar Components --- */
.logo {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 4px 16px rgba(0, 132, 255, 0.2);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--bright);
    line-height: 1.25;
}

.sidebar-title {
    font-family: var(--font-display);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.75rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--soft);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

.nav-item a:hover {
    color: var(--bright);
    background-color: rgba(255, 255, 255, 0.02);
}

.nav-item.active a {
    color: var(--bright);
    background: linear-gradient(90deg, rgba(0, 132, 255, 0.1), transparent);
    border-left: 3px solid var(--accent);
    padding-left: calc(1rem - 3px);
}

.nav-item.active.bloco-nav a {
    border-left-color: var(--accent-2);
    background: linear-gradient(90deg, rgba(108, 60, 255, 0.1), transparent);
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--bright);
    font-weight: 700;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 3.5vw, 2.75rem); letter-spacing: -0.02em; margin-bottom: 1.5rem; }
h2 { font-size: 1.75rem; border-bottom: 1px solid var(--slate); padding-bottom: 0.5rem; margin-top: 2.5rem; }
h3 { font-size: 1.25rem; margin-top: 1.75rem; }

p {
    margin-bottom: 1.25rem;
    font-size: 1rem;
    color: var(--soft);
}

strong {
    color: var(--bright);
}

.accent-text {
    color: var(--accent);
}

/* --- Cards e Boxes --- */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    background-color: rgba(0, 132, 255, 0.1);
    color: var(--accent);
    margin-bottom: 1rem;
}

.badge-bloco {
    background-color: rgba(108, 60, 255, 0.15);
    color: #a88eff;
}

.intro-card {
    background: linear-gradient(135deg, rgba(255,255,255,0.02) 0%, rgba(255,255,255,0.00) 100%);
    border: 1px solid var(--slate);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.intro-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle at 100% 0%, rgba(0, 132, 255, 0.1), transparent 70%);
    pointer-events: none;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background-color: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--slate);
    border-radius: 12px;
    padding: 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.1);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

/* --- Code and Prompts --- */
pre {
    background-color: #080a0f;
    border: 1px solid var(--slate);
    border-radius: 10px;
    padding: 1.25rem;
    margin: 1.5rem 0;
    overflow-x: auto;
    position: relative;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

:not(pre) > code {
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: var(--bright);
    font-size: 0.9em;
}

.prompt-box {
    background: linear-gradient(135deg, rgba(108, 60, 255, 0.05) 0%, rgba(0, 132, 255, 0.02) 100%);
    border: 1px solid rgba(108, 60, 255, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
}

.prompt-box-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: 600;
    color: #bfa3ff;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.prompt-content {
    font-family: var(--font-mono);
    color: var(--bright);
    background-color: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    font-size: 0.85rem;
    position: relative;
}

.btn-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: var(--slate);
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--soft);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    cursor: pointer;
    font-family: var(--font-body);
    transition: all 0.2s ease;
}

.btn-copy:hover {
    background-color: var(--accent);
    color: white;
}

/* --- Metaphor & Alert Boxes --- */
.alert-box {
    border-left: 4px solid var(--accent);
    background-color: rgba(0, 132, 255, 0.03);
    padding: 1.25rem 1.5rem;
    border-radius: 0 12px 12px 0;
    margin: 1.5rem 0;
}

.alert-box.info {
    border-left-color: var(--accent-2);
    background-color: rgba(108, 60, 255, 0.03);
}

.alert-box-title {
    font-weight: 600;
    color: var(--bright);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

/* --- Navigation Controls --- */
.page-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--slate);
}

.btn-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    text-decoration: none;
    max-width: 45%;
}

.btn-nav span {
    font-size: 0.75rem;
    color: var(--muted);
    text-transform: uppercase;
}

.btn-nav strong {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--bright);
    transition: color 0.2s ease;
}

.btn-nav:hover strong {
    color: var(--accent);
}

.btn-nav.next {
    text-align: right;
    align-items: flex-end;
}

.btn-nav.next:hover strong {
    color: var(--accent-2);
}

/* Responsive */
@media (max-width: 900px) {
    body {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--slate);
        padding: 1.5rem;
        height: auto;
    }
    .main-content {
        margin-left: 0;
        padding: 2rem;
    }
}