:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(18, 24, 38, 0.85);
    --bg-card-hover: rgba(28, 38, 58, 0.95);
    --bg-card-border: rgba(255, 255, 255, 0.08);
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-glow: rgba(59, 130, 246, 0.35);
    
    --word-color: #2b579a;
    --word-glow: rgba(43, 87, 154, 0.4);
    
    --split-color: #8b5cf6;
    --split-glow: rgba(139, 92, 246, 0.4);
    
    --accent: #60a5fa;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-light: #6b7280;
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --shadow-soft: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px var(--primary-glow);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Fondos Decorativos Difuminados */
.background-decor {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.22;
    animation: floatBlob 18s infinite alternate ease-in-out;
}

.blob-1 {
    width: 450px;
    height: 450px;
    background: #3b82f6;
    top: -100px;
    left: -100px;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: #8b5cf6;
    bottom: -100px;
    right: -100px;
    animation-delay: -6s;
}

.blob-3 {
    width: 300px;
    height: 300px;
    background: #06b6d4;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.12;
}

@keyframes floatBlob {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.15) translate(30px, 40px); }
}

/* Contenedor Principal */
.app-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
    width: 100%;
}

/* Header & Tabs */
.app-header {
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    padding: 1rem 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-icon-box {
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, #ef4444, #f97316);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #fff;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

.brand-text h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.1;
}

.brand-text h1 span {
    color: var(--primary);
}

.brand-tagline {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Barra de Navegación por Pestañas */
.tool-nav {
    display: flex;
    background: rgba(11, 15, 25, 0.7);
    padding: 0.35rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--bg-card-border);
    gap: 0.35rem;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.nav-tab:hover {
    color: var(--text-main);
}

.nav-tab.active {
    background: var(--primary);
    color: #fff;
    box-shadow: var(--shadow-glow);
}

.nav-tab[data-tab="word-tab"].active {
    background: var(--word-color);
    box-shadow: 0 0 20px var(--word-glow);
}

.nav-tab[data-tab="split-tab"].active {
    background: var(--split-color);
    box-shadow: 0 0 20px var(--split-glow);
}

/* Pestañas / Tab Panes */
.tab-pane {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

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

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

.tool-intro {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-intro h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.tool-intro p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Drop Zones */
.drop-zone {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: 3.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    box-shadow: var(--shadow-soft);
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.drop-zone.dragover {
    transform: scale(1.01);
}

.icon-circle {
    width: 70px;
    height: 70px;
    background: rgba(59, 130, 246, 0.12);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.25rem;
    transition: var(--transition);
}

.icon-circle.word-icon {
    background: rgba(43, 87, 154, 0.2);
    color: #60a5fa;
}

.icon-circle.split-icon {
    background: rgba(139, 92, 246, 0.15);
    color: #a78bfa;
}

.drop-zone:hover .icon-circle {
    transform: scale(1.1);
}

.dropzone-inner h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.dropzone-inner p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.07);
    color: var(--text-muted);
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.badge.word-badge {
    background: rgba(43, 87, 154, 0.25);
    color: #93c5fd;
}

.hidden-input {
    display: none;
}

/* Espacio de Trabajo / Workspaces */
.workspace-area {
    margin-top: 2rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-soft);
}

.workspace-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--bg-card-border);
    margin-bottom: 1.5rem;
}

.badge-counter {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.workspace-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filename-box {
    display: flex;
    align-items: center;
    background: rgba(11, 15, 25, 0.8);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 0.25rem 0.75rem;
    transition: var(--transition);
}

.filename-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.filename-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.9rem;
    padding: 0.35rem 0;
    min-width: 180px;
}

.filename-box .ext {
    color: var(--text-light);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.btn-large {
    padding: 0.85rem 1.75rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-icon {
    background: rgba(255, 255, 255, 0.08);
    border: none;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon:hover {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* Cuadrícula de Páginas (Grid) */
.pages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 1.25rem;
}

.page-card {
    background: rgba(11, 15, 25, 0.7);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 0.65rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    cursor: grab;
    transition: var(--transition);
    user-select: none;
}

.page-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
}

.page-card.dragging {
    opacity: 0.4;
    cursor: grabbing;
}

.page-preview {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1.414;
    background: #1e293b;
    border-radius: var(--radius-sm);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-preview canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.2s ease;
}

/* Clases de Rotación */
.rotate-90 { transform: rotate(90deg); }
.rotate-180 { transform: rotate(180deg); }
.rotate-270 { transform: rotate(270deg); }

.page-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: var(--transition);
}

.page-card:hover .page-actions {
    opacity: 1;
}

.action-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.action-btn.delete-btn:hover {
    background: var(--danger);
}

.page-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.page-number {
    font-weight: 700;
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-main);
}

.source-filename {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 105px;
}

/* Área Específica de Word */
.word-card-area {
    margin-top: 2rem;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.file-info-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(11, 15, 25, 0.6);
    border: 1px solid var(--bg-card-border);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
}

.file-icon-badge {
    width: 44px;
    height: 44px;
    background: rgba(43, 87, 154, 0.3);
    color: #93c5fd;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.file-details {
    flex: 1;
}

.file-details h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.file-details span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.rename-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.rename-container label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.action-row {
    display: flex;
    justify-content: center;
}

.document-preview-wrapper {
    margin-top: 1rem;
    border-top: 1px solid var(--bg-card-border);
    padding-top: 1.5rem;
}

.preview-header {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.document-page {
    background: #ffffff;
    color: #1a1a1a;
    padding: 3rem 2.5rem;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    max-height: 500px;
    overflow-y: auto;
    font-size: 0.95rem;
    line-height: 1.6;
}

.document-page h1, .document-page h2, .document-page h3 {
    color: #111827;
    margin-bottom: 0.75rem;
}

.document-page p {
    margin-bottom: 1rem;
}

.document-page table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.document-page th, .document-page td {
    border: 1px solid #d1d5db;
    padding: 8px 12px;
}

.document-page th {
    background: #f3f4f6;
}

/* Área de Dividir */
.split-range-box {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.split-range-box label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.split-range-box input {
    background: rgba(11, 15, 25, 0.8);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.85rem;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    min-width: 220px;
}

.split-range-box input:focus {
    border-color: var(--split-color);
}

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Footer */
.app-footer {
    margin-top: auto;
    padding-top: 3rem;
    text-align: center;
}

.footer-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--bg-card-border);
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-badge i {
    color: var(--success);
}

/* Loader Modal Global */
.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.2s ease-out;
}

.loader-modal {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    max-width: 380px;
    width: 90%;
}

.modern-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1.5rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-modal h3 {
    font-size: 1.2rem;
    margin-bottom: 0.4rem;
}

.loader-modal p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }
    .tool-nav {
        justify-content: center;
    }
    .workspace-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .workspace-controls {
        flex-direction: column;
    }
    .filename-box input {
        width: 100%;
    }
    .btn {
        width: 100%;
        justify-content: center;
    }
}