@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    --bg-main: hsl(222, 47%, 9%);
    --bg-card: rgba(23, 32, 51, 0.65);
    --bg-card-hover: rgba(30, 41, 67, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --color-primary: hsl(212, 100%, 61%);
    --color-primary-hover: hsl(212, 100%, 68%);
    --color-accent: hsl(262, 89%, 65%);
    --color-accent-hover: hsl(262, 89%, 72%);
    --text-main: hsl(210, 40%, 98%);
    --text-muted: hsl(210, 20%, 75%);
    --text-muted-dark: hsl(210, 15%, 55%);
    --success: hsl(145, 80%, 45%);
    --success-bg: rgba(16, 185, 129, 0.15);
    --danger: hsl(354, 85%, 56%);
    --danger-bg: rgba(239, 68, 68, 0.15);
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    height: 100%;
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Layout Grid */
.app-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

@media (max-width: 992px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
}

/* Main Content Area */
main {
    padding: 2.5rem;
    overflow-y: auto;
    background: radial-gradient(circle at 80% 10%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
                radial-gradient(circle at 10% 90%, rgba(139, 92, 246, 0.05) 0%, transparent 50%);
}

@media (max-width: 576px) {
    main {
        padding: 1.5rem 1rem;
    }
}

/* Typography & Titles */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Premium Glassmorphic Cards */
.nexus-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.4);
    transition: var(--transition-smooth);
    margin-bottom: 1.5rem;
}

.nexus-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 35px -5px rgba(59, 130, 246, 0.1);
    transform: translateY(-2px);
}

/* Buttons */
.btn-nexus {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 500;
    font-family: var(--font-sans);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-size: 0.95rem;
    text-decoration: none;
}

.btn-nexus-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-nexus-primary:hover {
    opacity: 0.9;
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-nexus-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-nexus-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-nexus-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-nexus-danger:hover {
    background: var(--danger);
    color: #fff;
}

/* Form Inputs */
.nexus-input, .nexus-textarea, .nexus-select {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.nexus-input:focus, .nexus-textarea:focus, .nexus-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
    background: rgba(15, 23, 42, 0.85);
}

.nexus-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* Real-time Progress Bar */
.progress-container {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50px;
    height: 12px;
    width: 100%;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: 50px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    box-shadow: 0 0 10px var(--color-primary);
}

/* Drag & Drop Zone */
.drag-drop-zone {
    border: 2px dashed rgba(255, 255, 255, 0.25);
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.drag-drop-zone:hover, .drag-drop-zone.active {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.05);
}

.drag-drop-icon {
    font-size: 3rem;
    color: var(--color-primary);
}

/* Tables & Logs */
.nexus-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.nexus-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.nexus-table th {
    background: rgba(15, 23, 42, 0.8);
    padding: 1rem;
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.nexus-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(23, 32, 51, 0.4);
    color: var(--text-main);
}

.nexus-table tr:last-child td {
    border-bottom: none;
}

.status-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
}

.status-badge-success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-badge-error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Grid layout for central resolution */
.filters-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--bg-card);
    padding: 1.25rem;
    border-radius: 14px;
    border: 1px solid var(--border-color);
}

.search-bar-wrapper {
    grid-column: 1 / -1;
}

/* Question Cards */
.questao-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.questao-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.meta-tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.meta-tag-banca {
    background: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
    border-color: rgba(59, 130, 246, 0.2);
    font-weight: 600;
}

.questao-enunciado {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-main);
    white-space: pre-line;
}

.questao-image-container {
    max-width: 100%;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    margin: 1rem 0;
    align-self: flex-start;
}

.questao-image {
    max-height: 350px;
    max-width: 100%;
    display: block;
    object-fit: contain;
}

/* Alternatives styling */
.alternatives-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.alternativa-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
    user-select: none;
}

.alternativa-item:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.2);
}

.alt-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.alt-text {
    font-size: 1.05rem;
    line-height: 1.4;
}

/* Correct / Incorrect states */
.alternativa-item.correct {
    background: var(--success-bg);
    border-color: var(--success);
}
.alternativa-item.correct .alt-letter {
    background: var(--success);
    color: #fff;
}

.alternativa-item.incorrect {
    background: var(--danger-bg);
    border-color: var(--danger);
}
.alternativa-item.incorrect .alt-letter {
    background: var(--danger);
    color: #fff;
}

/* Pill master-detail / editor */
.pilulas-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
}

@media (max-width: 992px) {
    .pilulas-grid {
        grid-template-columns: 1fr;
    }
}

.pilulas-sidebar-list {
    max-height: 70vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-right: 0.5rem;
}

.pilula-sidebar-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.pilula-sidebar-item:hover, .pilula-sidebar-item.active {
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--color-primary);
}

.pilula-sidebar-item h4 {
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

.pilula-sidebar-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* Markdown Preview Side by Side */
.markdown-editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .markdown-editor-layout {
        grid-template-columns: 1fr;
    }
}

.markdown-preview-box {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    overflow-y: auto;
    max-height: 350px;
}

.markdown-content h1, .markdown-content h2, .markdown-content h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
}
.markdown-content p {
    margin-bottom: 1rem;
    line-height: 1.6;
}
.markdown-content ul, .markdown-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}
.markdown-content code {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.15rem 0.3rem;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}
.markdown-content pre {
    background: #0f172a;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1rem;
}
.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
.markdown-content th, .markdown-content td {
    border: 1px solid var(--border-color);
    padding: 0.5rem;
    text-align: left;
}
.markdown-content th {
    background: rgba(255, 255, 255, 0.05);
}

/* Modo Foco / Tablet mode */
.modo-foco-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, hsl(222, 47%, 12%) 0%, hsl(222, 47%, 6%) 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    padding: 2rem;
}

.foco-header {
    position: absolute;
    top: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-exit-foco {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
    font-size: 0.9rem;
}

.btn-exit-foco:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-main);
}

.flashcard-wrapper {
    width: 100%;
    max-width: 750px;
    perspective: 1000px;
    cursor: pointer;
}

.flashcard {
    background: rgba(23, 32, 51, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 4rem 3rem;
    min-height: 380px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    position: relative;
}

.flashcard:hover {
    border-color: var(--color-primary);
    box-shadow: 0 25px 60px rgba(59, 130, 246, 0.15);
}

.flashcard-microtermo {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
}

.flashcard-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 2rem;
    line-height: 1.3;
}

.flashcard-tldr {
    font-size: 1.35rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 600px;
}

.foco-controls {
    display: flex;
    gap: 1.5rem;
    margin-top: 3rem;
    align-items: center;
}

.foco-control-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.foco-control-btn:hover {
    background: var(--color-primary);
    color: #fff;
    transform: scale(1.1);
}

.foco-page-indicator {
    font-size: 0.95rem;
    color: var(--text-muted-dark);
}

/* Modal Simple Style */
.nexus-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1050;
    padding: 1rem;
}

.nexus-modal {
    background: hsl(223, 47%, 12%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
}

.nexus-modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nexus-modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: 70vh;
}

.nexus-modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.close-btn:hover {
    color: var(--text-main);
}