:root {
    --bg-dark: #070b14;
    --bg-surface: #0f172a;
    --bg-card: #131d33;
    --bg-card-hover: #1e293b;
    --border-color: #24344d;
    --primary: #0284c7;
    --primary-light: #38bdf8;
    --primary-hover: #0369a1;
    --accent: #10b981;
    --accent-hover: #059669;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    background-color: #0b1120;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.pulse-indicator {
    width: 12px;
    height: 12px;
    background-color: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.brand-text .title {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #fff;
    display: block;
}

.brand-text .subtitle {
    font-size: 0.75rem;
    color: var(--primary-light);
    font-weight: 600;
}

.header-center {
    flex: 1;
    max-width: 480px;
    margin: 0 20px;
}

#curriculum-search {
    width: 100%;
    background: #17223b;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 14px;
    color: #fff;
    font-size: 0.88rem;
    outline: none;
    transition: all 0.2s;
}

#curriculum-search:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.btn-portal {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.btn-portal:hover {
    color: #fff;
    background: #1e293b;
}

.btn-epub {
    background: #065f46;
    color: #34d399;
    border: 1px solid #10b981;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-epub:hover {
    background: #047857;
    color: #fff;
}

.progress-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    min-width: 130px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: #1e293b;
    border-radius: 4px;
    overflow: hidden;
}

#progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #0284c7, #10b981);
    transition: width 0.3s;
}

/* Layout */
.main-layout {
    display: flex;
    flex: 1;
}

/* Sidebar Udemy Pro */
.sidebar {
    width: 360px;
    background: #0b1120;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 61px);
    position: sticky;
    top: 61px;
    overflow-y: auto;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    background: #0f172a;
}

.sidebar-header h3 {
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 800;
}

.sidebar-header .course-meta {
    font-size: 0.75rem;
    color: var(--primary-light);
    font-weight: 600;
}

/* Accordion de Módulos */
.module-accordion {
    flex: 1;
    overflow-y: auto;
}

.module-card {
    border-bottom: 1px solid var(--border-color);
}

.module-header {
    padding: 12px 16px;
    cursor: pointer;
    background: #0f172a;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
    user-select: none;
}

.module-header:hover {
    background: #1e293b;
}

.module-header.open {
    background: #131d33;
    border-left: 3px solid var(--primary-light);
}

.module-title-area {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.module-badge {
    font-size: 0.68rem;
    font-weight: 800;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.module-name {
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
}

.module-count {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.accordion-arrow {
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.module-lessons-list {
    display: none;
    background: #070b14;
}

.module-lessons-list.show {
    display: block;
}

.lesson-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 16px 10px 20px;
    border-left: 3px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.lesson-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.lesson-item.active {
    background: rgba(2, 132, 199, 0.15);
    border-left-color: var(--primary-light);
}

.lesson-checkbox {
    margin-top: 4px;
    cursor: pointer;
    accent-color: var(--accent);
}

.lesson-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
}

.lesson-title-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.35;
    font-weight: 500;
}

.lesson-item.active .lesson-title-text {
    color: #fff;
    font-weight: 700;
}

.lesson-pill-duration {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Sidebar Footer Tools */
.sidebar-footer-links {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    background: #0f172a;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-footer-links h4 {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 800;
}

.tool-btn {
    background: #17223b;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover {
    background: #1e293b;
    color: #fff;
    border-color: var(--primary-light);
}

/* Content Area */
.content-area {
    flex: 1;
    padding: 24px 32px;
    max-width: 1200px;
    overflow-y: auto;
}

/* 1. Player de Apresentação e Slides Interativos */
.video-presentation-player {
    background: linear-gradient(135deg, #0e172a 0%, #111e38 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

.player-header {
    background: #0b1120;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.player-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary-light);
    letter-spacing: 0.05em;
}

.live-dot {
    width: 8px;
    height: 8px;
    background: #ef4444;
    border-radius: 50%;
    box-shadow: 0 0 6px #ef4444;
}

.slide-nav-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.btn-slide-nav {
    background: #17223b;
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-slide-nav:hover {
    background: var(--primary);
}

.slide-stage {
    padding: 24px 28px;
    min-height: 220px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.slide-content-box h2 {
    font-size: 1.4rem;
    color: #fff;
    font-weight: 800;
    margin-bottom: 4px;
}

.slide-content-box h4 {
    font-size: 0.95rem;
    color: var(--primary-light);
    font-weight: 600;
    margin-bottom: 16px;
}

.slide-bullets {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.slide-bullets li {
    font-size: 0.92rem;
    color: #cbd5e1;
    position: relative;
    padding-left: 22px;
    line-height: 1.5;
}

.slide-bullets li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--primary-light);
    font-weight: 800;
    font-size: 1.1rem;
    top: -2px;
}

.speaker-notes-box {
    margin-top: 18px;
    background: rgba(15, 23, 42, 0.7);
    border-left: 3px solid var(--warning);
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.speaker-notes-box strong {
    color: var(--warning);
    display: block;
    margin-bottom: 2px;
}

/* Barra de Áudio / Podcast */
.audio-podcast-bar {
    background: #090e1a;
    border-top: 1px solid var(--border-color);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.audio-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.audio-info .icon {
    font-size: 1.4rem;
}

.audio-info strong {
    font-size: 0.85rem;
    color: #fff;
    display: block;
}

.audio-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.audio-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-audio {
    background: var(--primary);
    border: none;
    color: #fff;
    padding: 7px 16px;
    border-radius: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-audio:hover {
    background: var(--primary-hover);
}

.audio-time {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* 2. Barra de Abas */
.content-tabs-bar {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
    overflow-x: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    white-space: nowrap;
}

.tab-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
    color: var(--primary-light);
    border-bottom-color: var(--primary-light);
    background: rgba(56, 189, 248, 0.06);
}

/* 3. Painéis de Conteúdo */
.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.2s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Aba 1: Teoria */
.lesson-meta-bar {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.lesson-meta-bar h1 {
    font-size: 1.35rem;
    color: #fff;
    font-weight: 800;
}

.badge-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

.theory-article {
    color: #cbd5e1;
    font-size: 0.95rem;
    line-height: 1.7;
}

.theory-article h3 {
    font-size: 1.15rem;
    color: #fff;
    margin: 22px 0 10px;
    font-weight: 700;
}

.theory-article h4 {
    font-size: 1rem;
    color: var(--primary-light);
    margin: 16px 0 8px;
    font-weight: 700;
}

.theory-article p {
    margin-bottom: 14px;
}

.theory-article ul, .theory-article ol {
    margin: 10px 0 18px 24px;
}

.theory-article li {
    margin-bottom: 6px;
}

/* Aba 2: Configuração */
.config-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.config-header h2 {
    font-size: 1.2rem;
    color: #fff;
}

.code-pill {
    background: #17223b;
    border: 1px solid var(--primary);
    color: var(--primary-light);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    padding: 3px 10px;
    border-radius: 4px;
    font-weight: 700;
}

.config-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 14px;
}

pre {
    background: #090e1a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
}

pre code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #e2e8f0;
    line-height: 1.5;
}

/* Aba 3: Wireshark */
.wireshark-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.wireshark-header h2 {
    font-size: 1.2rem;
    color: #fff;
}

.protocol-pill {
    background: #3b0764;
    border: 1px solid #a855f7;
    color: #d8b4fe;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 3px 10px;
    border-radius: 4px;
    font-weight: 700;
}

.wireshark-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 14px;
}

.trace-box {
    background: #060911;
    border: 1px solid #334155;
    border-radius: 8px;
    overflow: hidden;
}

.trace-header {
    background: #1e293b;
    padding: 8px 14px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--primary-light);
    font-weight: 700;
    border-bottom: 1px solid #334155;
}

/* Aba 4: Diagramas */
.diagram-switcher {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.diag-btn {
    background: #17223b;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.diag-btn:hover {
    background: #1e293b;
    color: #fff;
}

.diag-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.diagram-viewport {
    background: #070b14;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
}

/* Aba 5: Simulador */
.simulator-header h2 {
    font-size: 1.25rem;
    color: #fff;
    margin-bottom: 4px;
}

.simulator-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 18px;
}

.routing-control-panel {
    background: #0f172a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-weight: 700;
    margin-bottom: 6px;
}

.select-route {
    width: 100%;
    background: #17223b;
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 10px 14px;
    border-radius: 6px;
    font-size: 0.88rem;
    outline: none;
}

.call-result-card {
    background: #131d33;
    border: 1px solid var(--primary-light);
    border-radius: 8px;
    padding: 20px;
}

.result-badge {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 14px;
}

.call-metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin-bottom: 16px;
}

.metric-item {
    background: #090e1a;
    padding: 10px 14px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.m-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.m-val {
    font-size: 0.95rem;
    color: #fff;
    font-weight: 700;
}

.m-val.highlight {
    color: var(--primary-light);
}

.m-val.green {
    color: var(--accent);
}

.route-path-box {
    background: #090e1a;
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: 6px;
    font-size: 0.85rem;
}

.route-path-box code {
    color: #38bdf8;
    font-family: var(--font-mono);
}

/* Aba 6: MicroSIP Table */
.alert-box {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-box.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.alert-title {
    font-weight: 800;
    font-size: 0.92rem;
    margin-bottom: 4px;
}

.table-sip th, .table-sip td {
    padding: 10px;
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
}

.table-sip tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

/* Footer Navigation */
.lesson-nav-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    margin-top: 30px;
}

.btn {
    padding: 10px 20px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: #1e293b;
    color: #cbd5e1;
}

.btn-secondary:hover {
    background: #334155;
    color: #fff;
}

.btn-accent {
    background: var(--accent);
    color: #fff;
}

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

/* Responsividade Mobile & Tablet */
@media (max-width: 992px) {
    .main-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        max-height: 380px;
        border-right: none;
        border-bottom: 2px solid var(--border-color);
    }
    .app-header {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }
    .header-center {
        margin: 0;
        max-width: 100%;
    }
    .header-right {
        justify-content: space-between;
        flex-wrap: wrap;
    }
    .content-area {
        padding: 16px;
    }
    .player-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .slide-nav-controls {
        width: 100%;
        justify-content: space-between;
    }
    .audio-podcast-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    .audio-controls {
        width: 100%;
        justify-content: space-between;
    }
    .content-tabs-bar {
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 4px;
    }
    .tab-btn {
        flex-shrink: 0;
    }
    .lesson-nav-footer {
        flex-direction: column;
        gap: 12px;
    }
    .lesson-nav-footer .btn {
        width: 100%;
        text-align: center;
    }
}