/* ==========================================================================
   CSS PRINCIPAL - CTF CAR HACKING HARDTECH 2026 (DESIGN CLEAN & MINIMALISTA)
   ========================================================================== */

/* Importação de Fontes Premium */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* Variáveis do Design System */
:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-code: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --color-accent: #4f46e5;
    --color-accent-hover: #4338ca;
    --color-accent-light: #e0e7ff;
    --color-success: #10b981;
    --color-success-bg: #ecfdf5;
    --color-success-border: #a7f3d0;
    --color-error: #ef4444;
    --color-error-bg: #fef2f2;
    --color-error-border: #fca5a5;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', "SFMono-Regular", Consolas, monospace;
}

/* Resets Globais & Acessibilidade */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container do App */
.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
}

.event-badge {
    display: inline-block;
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 6px 16px;
    border-radius: 9999px;
    margin-bottom: 12px;
}

h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.025em;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Navegação SPA (Abas Minimalistas) */
nav {
    display: flex;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.nav-tabs {
    display: flex;
    gap: 8px;
}

.tab-btn {
    background: none;
    border: none;
    outline: none;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 12px 24px;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--color-accent);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: 2px;
}

/* Seções de Abas */
.tab-content {
    display: none;
    animation: fadeIn var(--transition);
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Estilo de Cartão Padrão */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Aba 1: Desafio CTF - Estilos das Perguntas */
.mission-intro {
    background-color: var(--bg-card);
    border-left: 4px solid var(--color-accent);
}

.mission-intro p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.mission-intro p:last-child {
    margin-bottom: 0;
}

.code-badge {
    font-family: var(--font-mono);
    background-color: var(--bg-code);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.question-block {
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.question-block:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.question-header {
    margin-bottom: 16px;
}

.question-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 4px;
}

.question-text {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.question-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 6px;
}

/* Inputs de Texto das Perguntas */
.input-text-wrapper {
    margin-top: 16px;
}

.input-text {
    width: 100%;
    max-width: 450px;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: var(--transition);
    outline: none;
}

.input-text:focus {
    border-color: var(--color-accent);
    background-color: #ffffff;
    box-shadow: var(--shadow-sm), 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.input-text::placeholder {
    color: var(--text-muted);
}

/* Múltipla Escolha (Opções) */
.options-grid {
    display: grid;
    gap: 12px;
    margin-top: 16px;
    max-width: 600px;
}

.option-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 18px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.option-label:hover {
    border-color: var(--border-hover);
    background-color: #ffffff;
}

.option-label input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border: 1px solid var(--border-hover);
    border-radius: 50%;
    outline: none;
    margin-top: 2px;
    flex-shrink: 0;
    display: grid;
    place-content: center;
    background-color: #ffffff;
    transition: var(--transition);
}

.option-label input[type="radio"]::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transform: scale(0);
    transition: var(--transition);
    background-color: var(--color-accent);
}

.option-label input[type="radio"]:checked {
    border-color: var(--color-accent);
}

.option-label input[type="radio"]:checked::before {
    transform: scale(1);
}

.option-label:has(input[type="radio"]:checked) {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
}

.option-text {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Pergunta 2: Grid de Bytes Interativo */
.byte-selector-container {
    margin-top: 16px;
}

.byte-selector-helper {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.byte-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 10px;
    max-width: 500px;
}

.byte-box {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.byte-box:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.byte-label {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.byte-index {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Estado Selecionado do Byte */
.byte-box.selected {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.byte-box.selected .byte-label {
    color: #ffffff;
}

.byte-box.selected .byte-index {
    color: rgba(255, 255, 255, 0.7);
}

/* Botão de Envio Principal */
.submit-container {
    text-align: center;
    margin-top: 40px;
}

.btn-primary {
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 600;
    color: #ffffff;
    background-color: var(--color-accent);
    border: none;
    padding: 14px 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
    transition: var(--transition);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(79, 70, 229, 0.25);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Painel de Resultados do CTF (Substitui Alert nativo) */
.result-banner {
    margin-top: 30px;
    padding: 24px;
    border-radius: var(--radius-lg);
    animation: fadeIn var(--transition);
    display: none;
}

.result-banner.success {
    display: block;
    background-color: var(--color-success-bg);
    border: 1px solid var(--color-success-border);
}

.result-banner.error {
    display: block;
    background-color: var(--color-error-bg);
    border: 1px solid var(--color-error-border);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.result-icon {
    font-size: 1.5rem;
    font-weight: 700;
}

.result-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.result-banner.success .result-title {
    color: #065f46;
}

.result-banner.error .result-title {
    color: #991b1b;
}

.result-message {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.score-tracker {
    display: inline-block;
    padding: 4px 12px;
    font-family: var(--font-mono);
    font-weight: 700;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.result-banner.success .score-tracker {
    background-color: #d1fae5;
    color: #065f46;
}

.result-banner.error .score-tracker {
    background-color: #fee2e2;
    color: #991b1b;
}

.incorrect-list {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--border-color);
}

.incorrect-list-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: #991b1b;
    margin-bottom: 8px;
}

.incorrect-list ul {
    list-style-type: none;
    padding-left: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.incorrect-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}


/* Aba 2: CAN Tutorial - Estilos de Grade e Cards */
.tutorial-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media(min-width: 768px) {
    .tutorial-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tutorial-grid .full-width {
        grid-column: span 2;
    }
}

.tutorial-card {
    height: 100%;
    margin-bottom: 0;
}

.tutorial-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.tutorial-card p:last-child {
    margin-bottom: 0;
}

.illustration-box {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin: 16px 0;
    overflow-x: auto;
}

.chat-bubble {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
}

.chat-bubble:last-child {
    margin-bottom: 0;
}

.chat-bubble .sender {
    font-weight: 700;
    color: var(--color-accent);
}

.packet-diagram {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-top: 12px;
}

.packet-part {
    padding: 10px;
    text-align: center;
}

.packet-part.id-part {
    background-color: var(--color-accent-light);
    color: var(--color-accent);
    font-weight: 600;
    flex: 1;
    border-right: 1px solid var(--border-color);
}

.packet-part.payload-part {
    background-color: var(--bg-main);
    color: var(--text-primary);
    flex: 3;
}


/* Aba 3: Conversor Hexadecimal para Binário */
.converter-layout {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 600px;
    margin: 0 auto;
    align-items: center;
}

.hex-input-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.hex-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.hex-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.hex-prefix {
    font-family: var(--font-mono);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-right: 8px;
}

.hex-field {
    width: 120px;
    font-family: var(--font-mono);
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    text-transform: uppercase;
    padding: 8px 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    transition: var(--transition);
    background-color: var(--bg-main);
    color: var(--text-primary);
}

.hex-field:focus {
    border-color: var(--color-accent);
    background-color: #ffffff;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.binary-grid-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.bin-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.bits-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 12px;
    width: 100%;
}

.bit-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 8px;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.bit-box:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.bit-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-muted);
}

.bit-name {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-weight: 500;
}

/* Estado de Bit Ativo (1) */
.bit-box.active {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
}

.bit-box.active .bit-value {
    color: var(--color-accent);
}

.bit-box.active .bit-name {
    color: var(--color-accent);
    font-weight: 600;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsividade Geral */
@media (max-width: 640px) {
    .app-container {
        padding: 24px 16px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .byte-grid {
        grid-template-columns: repeat(4, 1fr);
        max-width: 100%;
    }
    
    .bits-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
}