/* Yudiaz LaTeX Studio - Modern Executive Styling */
:root {
    --bg-main: #0b0f19;
    --bg-surface: #111827;
    --bg-card: #182234;
    --bg-card-hover: #1e2c44;
    --border-color: #243048;
    --border-light: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --gold-primary: #d4af37;
    --gold-hover: #b89628;
    --gold-gradient: linear-gradient(135deg, #d4af37 0%, #a16207 100%);
    
    --emerald-primary: #10b981;
    --emerald-bg: rgba(16, 185, 129, 0.12);
    --red-primary: #ef4444;
    --red-bg: rgba(239, 68, 68, 0.12);
    --blue-primary: #3b82f6;
    
    --header-height: 60px;
    --sidebar-width: 280px;
    --files-width: 230px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* App Header */
.app-header {
    height: var(--header-height);
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    z-index: 50;
    flex-shrink: 0;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.brand-icon {
    width: 34px;
    height: 34px;
    background: var(--gold-gradient);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.brand-sub {
    font-size: 0.7rem;
    color: var(--gold-primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}

.gold-text {
    color: var(--gold-primary);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
}

.crumb-separator {
    color: var(--text-muted);
}

.crumb-folder {
    color: var(--text-secondary);
}

.crumb-title {
    color: var(--text-primary);
    font-weight: 600;
}

/* Header Center */
.header-center {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
    max-width: 600px;
    margin: 0 1.5rem;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.45rem 0.85rem;
    border-radius: 0.5rem;
    width: 100%;
    transition: all 0.2s;
}

.search-box:focus-within {
    border-color: var(--gold-primary);
    box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.15);
}

.search-box svg {
    color: var(--text-muted);
}

.search-box input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.85rem;
    width: 100%;
}

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

.editor-nav-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: 0.35rem 0.65rem;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 0.4rem;
}

.dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}
.dot.green { background-color: var(--emerald-primary); }
.dot.yellow { background-color: #f59e0b; }
.dot.red { background-color: var(--red-primary); }

/* Header Right */
.header-right {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.dashboard-actions, .editor-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.85rem;
    border-radius: 0.5rem;
    font-size: 0.825rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease-in-out;
    user-select: none;
}

.btn-primary {
    background: var(--gold-gradient);
    color: #ffffff;
    font-weight: 600;
    border: none;
    box-shadow: 0 4px 10px rgba(212, 175, 55, 0.25);
}
.btn-primary:hover {
    filter: brightness(1.1);
    box-shadow: 0 4px 14px rgba(212, 175, 55, 0.4);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-light);
}

.btn-compile {
    background: linear-gradient(135deg, #10b981 0%, #047857 100%);
    color: #ffffff;
    font-weight: 600;
    border: none;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}
.btn-compile:hover {
    filter: brightness(1.1);
}

.btn-icon {
    background-color: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 0.45rem;
    border-radius: 0.5rem;
}
.btn-icon:hover {
    color: var(--text-primary);
    background-color: var(--bg-card-hover);
}

.icon-btn-sm {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.35rem;
    cursor: pointer;
}
.icon-btn-sm:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

/* App Container Layout */
.app-container {
    flex: 1;
    height: calc(100vh - var(--header-height));
    display: flex;
    overflow: hidden;
}

.view-panel {
    width: 100%;
    height: 100%;
    display: flex;
}

/* 1. DASHBOARD LAYOUT */
.dashboard-layout {
    display: flex;
}

.folders-sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 700;
}

.folder-tree-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 0.5rem;
}

.tree-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    border-radius: 0.45rem;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
    transition: all 0.15s;
}

.tree-item:hover {
    background-color: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.tree-item.active {
    background-color: rgba(212, 175, 55, 0.12);
    color: var(--gold-primary);
    font-weight: 600;
}

.tree-content {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.folder-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.badge {
    background: var(--bg-card);
    font-size: 0.7rem;
    padding: 0.15rem 0.45rem;
    border-radius: 1rem;
    color: var(--text-muted);
}

.sidebar-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0.85rem 0.5rem;
}

.folder-tree-category {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 700;
    padding: 0.25rem 0.75rem 0.5rem;
}

.folder-sub-item {
    margin-left: 1.25rem;
    font-size: 0.8rem;
}

.sidebar-footer {
    padding: 0.85rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background-color: rgba(0, 0, 0, 0.2);
}

.studio-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.badge-dot {
    width: 6px;
    height: 6px;
    background-color: var(--emerald-primary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--emerald-primary);
}

/* Dashboard Content Area */
.dashboard-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 2rem;
    background-color: var(--bg-main);
}

.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.75rem;
}

.content-title {
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.content-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.25rem;
}

.project-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.project-card:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.35;
}

.card-folder-tag {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 0.35rem;
    font-weight: 600;
    background: rgba(212, 175, 55, 0.15);
    color: var(--gold-primary);
    white-space: nowrap;
}

.card-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.75rem;
    margin-top: auto;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.45rem;
    border-radius: 0.35rem;
    font-size: 0.7rem;
    font-weight: 500;
}

.status-pill.success {
    background-color: var(--emerald-bg);
    color: var(--emerald-primary);
}

.status-pill.error {
    background-color: var(--red-bg);
    color: var(--red-primary);
}

.status-pill.compiling {
    background-color: rgba(245, 158, 11, 0.12);
    color: #f59e0b;
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.4rem;
}

/* 2. EDITOR LAYOUT */
.editor-layout {
    display: flex;
    height: 100%;
    width: 100%;
}

.project-files-sidebar {
    width: var(--files-width);
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.files-header {
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.files-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 700;
}

.files-actions {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.files-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 0.6rem;
    border-radius: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    font-family: 'Fira Code', monospace;
    transition: all 0.15s;
}

.file-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.file-item.active {
    background-color: rgba(212, 175, 55, 0.15);
    color: var(--gold-primary);
    font-weight: 600;
}

.editor-info-box {
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.25);
    border-top: 1px solid var(--border-color);
    font-size: 0.72rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.info-label { color: var(--text-muted); }
.info-val { color: var(--text-primary); font-weight: 500; font-family: 'Fira Code', monospace; }

/* Editor Center Pane */
.editor-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    border-right: 1px solid var(--border-color);
    min-width: 320px;
}

.editor-toolbar {
    height: 38px;
    background-color: #121926;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.85rem;
}

.active-tab {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.8rem;
    font-family: 'Fira Code', monospace;
    color: var(--gold-primary);
    background: var(--bg-surface);
    padding: 0.3rem 0.75rem;
    border-radius: 0.35rem 0.35rem 0 0;
    border-top: 2px solid var(--gold-primary);
}

.ace-editor-container {
    flex: 1;
    width: 100%;
    height: 100%;
    font-family: 'Fira Code', monospace;
    font-size: 13.5px;
    line-height: 1.5;
}

/* Bottom Log Drawer */
.log-drawer {
    height: 200px;
    background: #0d121c;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 20;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.4);
}

.log-header {
    padding: 0.4rem 0.85rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
}

.log-console {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem 1rem;
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: #cbd5e1;
    white-space: pre-wrap;
    line-height: 1.45;
}

.log-errors-list {
    background: rgba(239, 68, 68, 0.1);
    border-bottom: 1px solid rgba(239, 68, 68, 0.2);
    padding: 0.4rem 0.85rem;
    font-size: 0.75rem;
    color: #fca5a5;
}

/* PDF Preview Pane */
.preview-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    background-color: #1a2234;
    min-width: 320px;
}

.preview-toolbar {
    height: 38px;
    background-color: #121926;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.85rem;
}

.preview-heading {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.preview-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-tool {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.3rem 0.5rem;
    border-radius: 0.3rem;
    cursor: pointer;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.btn-tool:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

.badge-mini {
    font-size: 0.65rem;
    padding: 0.1rem 0.35rem;
    border-radius: 0.25rem;
    font-weight: 600;
}
.badge-mini.green { background: var(--emerald-bg); color: var(--emerald-primary); }
.badge-mini.red { background: var(--red-bg); color: var(--red-primary); }

.pdf-wrapper {
    flex: 1;
    width: 100%;
    height: calc(100% - 38px);
    position: relative;
    background: #111827;
}

.pdf-wrapper iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.pdf-loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(3px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.85rem;
    font-size: 0.85rem;
    color: var(--gold-primary);
    z-index: 15;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(212, 175, 55, 0.2);
    border-top-color: var(--gold-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Modals */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

.modal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: 0.85rem;
    width: 100%;
    max-width: 520px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    overflow: hidden;
}

.modal-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
}
.modal-close:hover { color: var(--text-primary); }

.modal-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input, .form-group select {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.55rem 0.85rem;
    border-radius: 0.45rem;
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--gold-primary);
}

.template-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}

.template-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.65rem 0.8rem;
    border-radius: 0.45rem;
    cursor: pointer;
    transition: all 0.15s;
}
.template-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
}
.template-card.selected {
    border-color: var(--gold-primary);
    background: rgba(212, 175, 55, 0.1);
}

.template-name {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-primary);
}
.template-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
    line-height: 1.3;
}

.color-picker-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
}

.color-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 0.2rem;
}

.share-url-box {
    display: flex;
    gap: 0.5rem;
}
.share-url-box input {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.8rem;
    border-radius: 0.45rem;
    color: var(--gold-primary);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
}

.modal-footer {
    padding: 0.85rem 1.25rem;
    background: rgba(0, 0, 0, 0.15);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.6rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    font-size: 0.85rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 200;
    display: none;
    animation: fadeIn 0.2s;
}
.toast.show { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================================
   MOBILE & RESPONSIVE UX ENGINE (Thumb-friendly & Executive)
   ============================================================ */

.mobile-only {
    display: none !important;
}

.desktop-only {
    display: flex !important;
}

.desktop-only-inline {
    display: inline !important;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.5rem;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border-radius: 0.4rem;
}
.mobile-menu-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* Mobile Quick Folder Carousel */
.mobile-folder-bar {
    display: none;
    background: #0f1624;
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    gap: 0.45rem;
    scrollbar-width: none;
}
.mobile-folder-bar::-webkit-scrollbar {
    display: none;
}

.folder-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    transition: all 0.15s ease;
}
.folder-chip:active {
    transform: scale(0.96);
}
.folder-chip.active {
    background: rgba(212, 175, 55, 0.15);
    border-color: var(--gold-primary);
    color: var(--gold-primary);
    font-weight: 600;
}

/* Mobile Drawer Backdrop */
.drawer-backdrop {
    display: none !important;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 80;
    pointer-events: none !important;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.drawer-backdrop.active {
    display: block !important;
    pointer-events: auto !important;
    opacity: 1;
}

/* Mobile Segmented Editor Tabs */
.mobile-editor-tabs {
    display: none;
    background: #111827;
    border-bottom: 1px solid var(--border-color);
    padding: 0.35rem 0.5rem;
    gap: 0.4rem;
    z-index: 30;
}

.mobile-editor-tabs .tab-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 0.5rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 0.45rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.mobile-editor-tabs .tab-btn.active {
    background: var(--bg-card);
    border-color: var(--border-color);
    color: var(--gold-primary);
    font-weight: 600;
}

/* Mobile Floating Action Bar */
.mobile-floating-bar {
    display: none;
    position: fixed;
    bottom: 1.25rem;
    left: 1rem;
    right: 1rem;
    z-index: 45;
    pointer-events: none;
}

.mobile-fab-compile {
    pointer-events: auto;
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 0.75rem;
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.4);
    justify-content: center;
    letter-spacing: 0.01em;
}

/* Responsive Breakpoints for Tablet & Mobile (<= 850px) */
@media (max-width: 850px) {
    .desktop-only {
        display: none !important;
    }
    .desktop-only-inline {
        display: none !important;
    }
    .mobile-only {
        display: flex !important;
    }
    .mobile-folder-bar.mobile-only {
        display: flex !important;
    }
    .drawer-backdrop.active {
        display: block !important;
    }

    /* Header adaptations */
    .app-header {
        padding: 0 0.85rem;
        height: 56px;
    }

    .brand-icon {
        width: 30px;
        height: 30px;
        font-size: 0.95rem;
    }
    .brand-name {
        font-size: 0.88rem;
    }

    .header-center {
        margin: 0 0.5rem;
        max-width: 180px;
    }
    .search-box {
        padding: 0.35rem 0.6rem;
    }
    .search-box input {
        font-size: 0.8rem;
    }

    .header-right {
        gap: 0.4rem;
    }
    .btn {
        padding: 0.45rem 0.7rem;
        font-size: 0.78rem;
    }
    .btn-back-dashboard {
        padding: 0.4rem 0.6rem;
    }

    /* Dashboard Sidebar as Slide-Over Drawer on Mobile */
    .drawer-backdrop {
        display: none !important;
        pointer-events: none !important;
    }
    .drawer-backdrop.active {
        display: block !important;
        pointer-events: auto !important;
    }

    body {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    .app-container {
        height: auto;
        min-height: calc(100dvh - 56px);
        overflow: visible;
    }
    .dashboard-layout {
        height: auto;
        min-height: calc(100dvh - 56px);
        overflow: visible;
    }
    .dashboard-content {
        overflow: visible;
        padding: 1rem 0.85rem 6rem 0.85rem;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
    }

    .folders-sidebar {
        position: fixed;
        top: 0;
        bottom: 0;
        left: -300px;
        width: 280px;
        z-index: 90;
        box-shadow: 8px 0 25px rgba(0, 0, 0, 0.6);
        transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        display: flex;
    }
    .folders-sidebar.drawer-open {
        transform: translateX(300px);
    }
    .folders-sidebar .sidebar-header {
        padding: 1.15rem 1rem;
    }
    .content-header {
        margin-bottom: 1.15rem;
    }
    .content-title {
        font-size: 1.25rem;
    }

    /* Project Cards on Mobile */
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 0.85rem;
    }
    .project-card {
        padding: 1rem;
        border-radius: 0.65rem;
    }
    .project-card:active {
        background-color: var(--bg-card-hover);
        transform: scale(0.99);
    }
    .card-title {
        font-size: 1rem;
    }
    .card-actions .btn {
        padding: 0.5rem 0.85rem;
        font-size: 0.82rem;
    }

    /* Editor Layout on Mobile: Single Active Pane */
    .editor-layout {
        flex-direction: column;
        height: calc(100vh - 56px);
        overflow: hidden;
    }

    .mobile-editor-tabs {
        display: flex !important;
    }

    /* Pane visibility toggled by state */
    .project-files-sidebar,
    .editor-pane,
    .preview-pane {
        width: 100% !important;
        flex: 1 !important;
        min-width: 0 !important;
        height: 100% !important;
        border: none !important;
        display: none !important;
    }

    /* Active Pane Rules */
    .editor-layout.tab-files #pane-files {
        display: flex !important;
    }
    .editor-layout.tab-editor #pane-editor {
        display: flex !important;
    }
    .editor-layout.tab-preview #pane-preview {
        display: flex !important;
    }

    .editor-pane {
        padding-bottom: 4.5rem; /* Room for floating compile button */
    }

    .ace-editor-container {
        font-size: 14px; /* Crisp on mobile */
    }

    .log-drawer {
        height: 250px;
        bottom: 4rem;
    }

    .preview-pane {
        padding-bottom: 0.5rem;
    }
    .pdf-wrapper {
        height: 100%;
    }

    .mobile-floating-bar {
        display: flex !important;
    }

    /* Modals as Bottom-Sheets on Mobile */
    .modal-backdrop {
        align-items: flex-end;
        padding: 0;
    }
    .modal-card {
        max-width: 100%;
        border-radius: 1.25rem 1.25rem 0 0;
        max-height: 88vh;
        overflow-y: auto;
        animation: slideUp 0.25s ease-out;
    }
    @keyframes slideUp {
        from { transform: translateY(100%); }
        to { transform: translateY(0); }
    }
    .modal-header {
        padding: 1.15rem 1.25rem 0.85rem;
    }
    .modal-body {
        padding: 1rem 1.25rem;
        gap: 1.15rem;
    }
    .form-group input, .form-group select {
        padding: 0.75rem 0.85rem;
        font-size: 1rem; /* Prevents auto zoom-in on iOS */
    }
    .template-selector {
        grid-template-columns: 1fr;
    }
    .template-card {
        padding: 0.75rem 0.85rem;
    }
    .modal-footer {
        padding: 1rem 1.25rem 1.5rem;
    }
    .modal-footer .btn {
        flex: 1;
        padding: 0.75rem;
        justify-content: center;
        font-size: 0.9rem;
    }
}

/* ============================================================
   CONTINUOUS MULTI-PAGE PDF VIEWER (PDF.js Engine)
   ============================================================ */
.pdf-viewer-root {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    background: #0f1624;
    overflow: hidden;
    position: relative;
}

.pdf-controls-bar {
    height: 42px;
    background: #111827;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.85rem;
    flex-shrink: 0;
    gap: 0.5rem;
    z-index: 10;
}

.pdf-controls-left, .pdf-controls-center, .pdf-controls-right {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.pdf-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.3rem 0.55rem;
    border-radius: 0.35rem;
    font-size: 0.78rem;
    cursor: pointer;
    user-select: none;
    transition: all 0.15s;
    min-height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.pdf-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}
.pdf-btn:active {
    transform: scale(0.96);
}

.pdf-btn-action {
    background: rgba(212, 175, 55, 0.15);
    border-color: rgba(212, 175, 55, 0.3);
    color: var(--gold-primary);
    font-weight: 600;
}

.pdf-page-indicator {
    font-size: 0.78rem;
    font-family: 'Fira Code', monospace;
    color: var(--text-primary);
    padding: 0.2rem 0.4rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.3rem;
}

.pdf-zoom-level {
    font-size: 0.75rem;
    font-family: 'Fira Code', monospace;
    color: var(--text-muted);
    min-width: 42px;
    text-align: center;
}

.pdf-scroll-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    padding: 1rem 0.5rem 2.5rem 0.5rem;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    position: relative;
}

.pdf-loading-spinner {
    position: absolute;
    inset: 0;
    background: rgba(11, 15, 25, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--gold-primary);
    font-size: 0.85rem;
    z-index: 20;
}

.pdf-pages-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    margin: 0 auto;
    max-width: 100%;
}

.pdf-page-card {
    background: #ffffff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
    border-radius: 2px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.2s;
    max-width: 100%;
}

/* TextLayer for PDF text selection and double-click reverse sync */
.textLayer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    opacity: 0.25;
    line-height: 1.0;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    text-size-adjust: none;
    forced-color-adjust: none;
    transform-origin: 0 0;
    z-index: 2;
    pointer-events: auto;
}

.textLayer span,
.textLayer br {
    color: transparent;
    position: absolute;
    white-space: pre;
    cursor: text;
    transform-origin: 0% 0%;
}

.textLayer ::selection {
    background: rgba(212, 175, 55, 0.4);
    color: transparent;
}

.pdf-canvas {
    display: block;
    max-width: 100%;
    height: auto !important;
}

.pdf-page-number-badge {
    position: absolute;
    bottom: -22px;
    font-size: 0.68rem;
    color: var(--text-muted);
    font-family: 'Fira Code', monospace;
}

@media (max-width: 600px) {
    .pdf-controls-bar {
        padding: 0 0.5rem;
        height: 38px;
    }
    .pdf-btn {
        padding: 0.25rem 0.45rem;
        font-size: 0.72rem;
    }
    .pdf-zoom-level {
        display: none;
    }
    #pdf-viewer-fit-width {
        display: none;
    }
}