/*
Theme Name: Xl in Excel
Theme URI: https://xlinexcel.com
Author: Pardeep Patel
Author URI: https://xlinexcel.com
Description: A clean, modern WordPress theme inspired by Microsoft Excel & Spreadsheet Fluent Design. Built for spreadsheet bloggers and educators with Ribbon navigation, Formula Bar search, copyable formula blocks, workbook download badges, and flexible sidebar layouts (Right, Left, or No Sidebar).
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: xlinexcel
Tags: blog, education, custom-header, custom-menu, featured-images, flexible-header, full-width-template, grid-layout, left-sidebar, right-sidebar, theme-options, translation-ready
*/

:root {
  --excel-green: #107C41;
  --excel-green-hover: #0d6b37;
  --excel-dark: #0E5C2F;
  --excel-forest: #073B1E;
  --excel-tint: #E8F5E9;
  --excel-selection: rgba(16, 124, 65, 0.12);
  --excel-border: #E5E7EB;
  --excel-border-strong: #D1D5DB;
  --excel-grid: #EDF2F7;
  --excel-bg: #F8F9FA;
  --excel-card-bg: #FFFFFF;
  --excel-text: #111827;
  --excel-text-muted: #4B5563;
  --excel-text-light: #9CA3AF;
  --excel-formula-bg: #1E293B;
  --excel-formula-text: #E2E8F0;
  --excel-blue: #2563EB;
  --excel-amber: #D97706;
  --excel-red: #DC2626;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', Courier, monospace;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-excel: 0 0 0 2px var(--excel-green);
  --container-max: 1240px;
}

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

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

a {
  color: var(--excel-green);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--excel-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Top Header & Excel Ribbon
   ========================================================================== */
.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--excel-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.ribbon-top-bar {
  background: var(--excel-green);
  color: #ffffff;
  padding: 10px 0;
}

.ribbon-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: #0E5C2F;
  border: 1.5px solid rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  color: #ffffff;
  letter-spacing: -0.5px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.2);
}

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

.site-title {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.2;
}

.site-title a {
  color: #ffffff;
}

.site-tagline {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.3px;
  text-transform: uppercase;
  font-weight: 500;
}

.header-quick-links {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
}

.header-quick-links a {
  color: rgba(255, 255, 255, 0.9);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.header-quick-links a:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

/* Ribbon Tabs Bar */
.ribbon-tabs-bar {
  background: #ffffff;
  border-bottom: 1px solid var(--excel-border);
}

.ribbon-nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.ribbon-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  white-space: nowrap;
}

.ribbon-menu li a {
  display: inline-block;
  padding: 12px 18px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--excel-text-muted);
  position: relative;
  transition: all 0.15s ease;
}

.ribbon-menu li a:hover {
  color: var(--excel-green);
  background: var(--excel-bg);
}

.ribbon-menu li.current-menu-item a,
.ribbon-menu li.current_page_item a {
  color: var(--excel-green);
  background: #ffffff;
}

.ribbon-menu li.current-menu-item a::after,
.ribbon-menu li.current_page_item a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--excel-green);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: #ffffff;
  font-size: 22px;
  cursor: pointer;
  padding: 4px;
}

/* ==========================================================================
   Formula Bar Global Search
   ========================================================================== */
.formula-search-bar-wrap {
  background: #F3F4F6;
  border-bottom: 1px solid var(--excel-border);
  padding: 6px 0;
}

.formula-bar-container {
  display: flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--excel-border-strong);
  border-radius: var(--radius-sm);
  padding: 2px 4px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
}

.name-box {
  background: #F8F9FA;
  border-right: 1px solid var(--excel-border);
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--excel-text-muted);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.name-box .cell-indicator {
  color: var(--excel-green);
}

.fx-button {
  background: transparent;
  border: none;
  color: #6B7280;
  font-family: 'Times New Roman', serif;
  font-style: italic;
  font-size: 17px;
  font-weight: bold;
  padding: 0 10px;
  display: flex;
  align-items: center;
  cursor: default;
  user-select: none;
}

.formula-search-form {
  flex: 1;
  display: flex;
  align-items: center;
}

.formula-search-input {
  width: 100%;
  border: none;
  outline: none;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--excel-text);
  background: transparent;
}

.formula-search-input::placeholder {
  color: #9CA3AF;
  font-family: var(--font-mono);
}

.formula-search-btn {
  background: var(--excel-green);
  color: #ffffff;
  border: none;
  border-radius: 3px;
  padding: 5px 14px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.formula-search-btn:hover {
  background: var(--excel-dark);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.excel-hero {
  background: #ffffff;
  border-bottom: 1px solid var(--excel-border);
  padding: 48px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--excel-tint);
  border: 1px solid rgba(16, 124, 65, 0.25);
  color: var(--excel-green);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: 40px;
  font-weight: 800;
  color: #0F172A;
  line-height: 1.18;
  margin-bottom: 16px;
}

.hero-title span {
  color: var(--excel-green);
}

.hero-subtitle {
  font-size: 16px;
  color: var(--excel-text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-excel-primary {
  background: var(--excel-green);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: all 0.15s ease;
}

.btn-excel-primary:hover {
  background: var(--excel-dark);
  transform: translateY(-1px);
}

.btn-excel-secondary {
  background: #F3F4F6;
  color: var(--excel-text) !important;
  font-weight: 600;
  font-size: 14px;
  padding: 10px 20px;
  border: 1px solid var(--excel-border-strong);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
}

.btn-excel-secondary:hover {
  background: #E5E7EB;
}

/* Interactive Mockup Card */
.spreadsheet-mockup-card {
  background: #ffffff;
  border: 1px solid var(--excel-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.mockup-header-bar {
  background: #F3F4F6;
  border-bottom: 1px solid var(--excel-border);
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 600;
  color: var(--excel-text-muted);
}

.mockup-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  font-family: var(--font-sans);
}

.mockup-table th {
  background: #F8F9FA;
  border: 1px solid var(--excel-border);
  padding: 6px 10px;
  font-weight: 600;
  color: #64748B;
  text-align: center;
}

.mockup-table td {
  border: 1px solid var(--excel-border);
  padding: 6px 10px;
  color: var(--excel-text);
}

.mockup-table td.row-num {
  background: #F8F9FA;
  font-weight: 600;
  color: #64748B;
  text-align: center;
  width: 34px;
}

.mockup-table td.active-cell {
  background: #E8F5E9;
  border: 2px solid var(--excel-green) !important;
  position: relative;
  font-weight: 600;
}

.active-cell::after {
  content: '';
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 6px;
  height: 6px;
  background: var(--excel-green);
}

.mockup-formula-preview {
  background: #F1F5F9;
  border-top: 1px solid var(--excel-border);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: #0F172A;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mockup-formula-preview strong {
  color: var(--excel-green);
}

/* ==========================================================================
   Quick Cheat-Sheet Cards Grid
   ========================================================================== */
.cheat-sheets-section {
  padding: 40px 0;
}

.section-title-wrap {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--excel-border);
  padding-bottom: 12px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: #0F172A;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title .section-cell-ref {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--excel-tint);
  color: var(--excel-green);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.cheat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.cheat-card {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.cheat-card:hover {
  border-color: var(--excel-green);
  box-shadow: 0 6px 16px rgba(16, 124, 65, 0.08);
  transform: translateY(-2px);
}

.cheat-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.cheat-pill {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
  background: #F1F5F9;
  color: #475569;
}

.cheat-card-title {
  font-size: 16px;
  font-weight: 700;
  color: #0F172A;
  margin-bottom: 8px;
}

.cheat-card-desc {
  font-size: 13px;
  color: var(--excel-text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.cheat-formula-box {
  background: #F8FAFC;
  border: 1px dashed var(--excel-border-strong);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--excel-green);
  font-weight: 600;
  margin-bottom: 14px;
}

/* ==========================================================================
   Spreadsheet Tabular Articles Table & Content Cards
   ========================================================================== */
.tutorials-table-section {
  padding-bottom: 48px;
}

.spreadsheet-table-container {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spreadsheet-header-row {
  background: #F3F4F6;
  border-bottom: 1px solid var(--excel-border-strong);
  display: grid;
  grid-template-columns: 46px 1fr 180px 140px 140px;
  font-size: 12px;
  font-weight: 700;
  color: #475569;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.col-header {
  padding: 10px 14px;
  border-right: 1px solid var(--excel-border);
  display: flex;
  align-items: center;
}

.col-header:last-child {
  border-right: none;
}

.spreadsheet-row {
  display: grid;
  grid-template-columns: 46px 1fr 180px 140px 140px;
  border-bottom: 1px solid var(--excel-border);
  transition: background 0.15s ease;
  align-items: center;
}

.spreadsheet-row:hover {
  background: #F0FDF4;
}

.cell {
  padding: 14px;
  border-right: 1px solid var(--excel-border);
  font-size: 13.5px;
}

.cell:last-child {
  border-right: none;
}

.cell-num {
  text-align: center;
  font-weight: 600;
  color: #94A3B8;
  background: #F8FAFC;
}

.cell-title-block a {
  font-weight: 600;
  color: #0F172A;
  font-size: 14.5px;
  display: block;
  margin-bottom: 3px;
}

.cell-title-block a:hover {
  color: var(--excel-green);
}

.cell-excerpt {
  font-size: 12px;
  color: var(--excel-text-muted);
}

.platform-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.platform-excel {
  background: #E8F5E9;
  color: #107C41;
  border: 1px solid rgba(16, 124, 65, 0.3);
}

.platform-sheets {
  background: #E6F4EA;
  color: #137333;
  border: 1px solid rgba(19, 115, 51, 0.3);
}

.platform-calc {
  background: #EFF6FF;
  color: #1D4ED8;
  border: 1px solid rgba(29, 78, 216, 0.3);
}

.badge-difficulty {
  font-size: 11.5px;
  font-weight: 600;
  color: #475569;
}

.btn-download-wb {
  background: #ffffff;
  border: 1px solid var(--excel-border-strong);
  color: var(--excel-green) !important;
  font-weight: 600;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-download-wb:hover {
  background: var(--excel-green);
  color: #ffffff !important;
  border-color: var(--excel-green);
}

/* ==========================================================================
   Single Post Layouts (Left, Right, No Sidebar)
   ========================================================================== */
.post-layout-wrapper {
  padding: 36px 0 60px;
}

/* Layout: Right Sidebar (Default) */
.layout-right-sidebar {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 36px;
}

/* Layout: Left Sidebar */
.layout-left-sidebar {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 36px;
}

/* Layout: No Sidebar */
.layout-no-sidebar {
  max-width: 960px;
  margin: 0 auto;
}

/* Post Header */
.post-header {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.breadcrumb-excel {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--excel-text-muted);
  margin-bottom: 14px;
  font-family: var(--font-mono);
}

.breadcrumb-excel a {
  color: var(--excel-text-muted);
}

.breadcrumb-excel a:hover {
  color: var(--excel-green);
}

.post-title {
  font-size: 32px;
  font-weight: 800;
  color: #0F172A;
  line-height: 1.25;
  margin-bottom: 16px;
}

.post-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--excel-text-muted);
  border-top: 1px solid var(--excel-border);
  padding-top: 14px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Action Bar (Replaces Bookmark) */
.article-action-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.btn-action-tool {
  background: #F8FAFC;
  border: 1px solid var(--excel-border-strong);
  color: var(--excel-text) !important;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-action-tool:hover {
  background: #E2E8F0;
  color: #0F172A !important;
}

.btn-action-tool.active-copy {
  background: #E8F5E9;
  border-color: var(--excel-green);
  color: var(--excel-green) !important;
}

/* Post Content Typography */
.post-entry-content {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  font-size: 16px;
  line-height: 1.75;
  color: #1E293B;
}

.post-entry-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0F172A;
  margin: 32px 0 16px;
  border-bottom: 2px solid var(--excel-border);
  padding-bottom: 8px;
}

.post-entry-content h3 {
  font-size: 19px;
  font-weight: 600;
  color: #0F172A;
  margin: 24px 0 12px;
}

.post-entry-content p {
  margin-bottom: 20px;
}

.post-entry-content ul,
.post-entry-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.post-entry-content li {
  margin-bottom: 8px;
}

/* Formula Highlight Callout Box */
.formula-callout-box {
  background: #0F172A;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 28px 0;
  border: 1px solid #334155;
  box-shadow: var(--shadow-md);
}

.formula-callout-header {
  background: #1E293B;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #334155;
}

.formula-callout-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: #94A3B8;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.formula-callout-label .fx-badge {
  color: #107C41;
  font-weight: 800;
}

.copy-formula-btn {
  background: #334155;
  color: #F8FAFC;
  border: none;
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.copy-formula-btn:hover {
  background: var(--excel-green);
  color: #ffffff;
}

.formula-code-body {
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 14.5px;
  color: #38BDF8;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
}

.formula-syntax-args {
  color: #F8FAFC;
}

/* Keyboard Shortcut Keycaps */
.kbd-key {
  display: inline-block;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: #1E293B;
  background-color: #F1F5F9;
  border: 1px solid #CBD5E1;
  border-bottom: 2px solid #94A3B8;
  border-radius: 4px;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.05);
  margin: 0 3px;
}

/* Excel Note / Comment Callout */
.excel-note-callout {
  background: #FFFBEB;
  border-left: 4px solid #F59E0B;
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-size: 14.5px;
  color: #92400E;
}

.excel-note-callout strong {
  color: #78350F;
  display: block;
  margin-bottom: 4px;
}

/* Practice Workbook Download Card */
.workbook-download-card {
  background: linear-gradient(135deg, #F0FDF4 0%, #DCFCE7 100%);
  border: 1.5px solid #86EFAC;
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.wb-card-info h4 {
  font-size: 17px;
  font-weight: 700;
  color: #14532D;
  margin-bottom: 4px;
}

.wb-card-info p {
  font-size: 13px;
  color: #166534;
  margin: 0;
}

/* ==========================================================================
   Sidebar Widgets
   ========================================================================== */
.sidebar-wrapper {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.widget-title {
  font-size: 15px;
  font-weight: 700;
  color: #0F172A;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--excel-green);
  padding-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Table of Contents Widget */
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list li a {
  display: block;
  font-size: 13px;
  color: var(--excel-text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.toc-list li a:hover,
.toc-list li.active a {
  background: var(--excel-tint);
  color: var(--excel-green);
  font-weight: 600;
}

/* Top Jump Pill Bar (For No-Sidebar Mode) */
.toc-jump-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 18px 0 24px;
  padding: 12px;
  background: #F8FAFC;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
}

.toc-jump-pill {
  font-size: 12px;
  font-weight: 600;
  color: var(--excel-text-muted);
  background: #ffffff;
  border: 1px solid var(--excel-border);
  padding: 4px 10px;
  border-radius: 20px;
  transition: all 0.15s ease;
}

.toc-jump-pill:hover {
  background: var(--excel-green);
  color: #ffffff;
  border-color: var(--excel-green);
}

/* ==========================================================================
   Author Page & Archive
   ========================================================================== */
.author-profile-card {
  background: #ffffff;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.author-header-flex {
  display: flex;
  gap: 24px;
  align-items: center;
  margin-bottom: 24px;
}

.author-avatar-img {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 3px solid var(--excel-green);
  object-fit: cover;
}

.author-kpi-range {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  background: #F8FAFC;
  border: 1px solid var(--excel-border);
  border-radius: var(--radius-sm);
  padding: 14px;
}

.kpi-cell {
  text-align: center;
  border-right: 1px solid var(--excel-border);
}

.kpi-cell:last-child {
  border-right: none;
}

.kpi-formula {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--excel-text-muted);
  margin-bottom: 4px;
}

.kpi-val {
  font-size: 20px;
  font-weight: 800;
  color: var(--excel-green);
}

/* ==========================================================================
   404 Error Page (#REF!)
   ========================================================================== */
.error-404-container {
  padding: 64px 0 80px;
  text-align: center;
}

.error-cell-box {
  background: #ffffff;
  border: 2px dashed var(--excel-green);
  border-radius: var(--radius-md);
  padding: 48px;
  max-width: 680px;
  margin: 0 auto 36px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.error-triangle-flag {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-top: 24px solid #F59E0B;
  border-right: 24px solid transparent;
}

.error-formula-code {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 800;
  color: #DC2626;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.error-subhead {
  font-size: 18px;
  font-weight: 700;
  color: #0F172A;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 14.5px;
  color: var(--excel-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* ==========================================================================
   Footer & Excel Status Bar
   ========================================================================== */
.excel-status-bar {
  background: var(--excel-green);
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
  padding: 8px 0;
  border-top: 1px solid var(--excel-dark);
}

.status-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.status-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-ready-pill {
  background: #0E5C2F;
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.sheet-tabs-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.sheet-tabs-list li a {
  background: #0E5C2F;
  color: #E8F5E9;
  padding: 3px 12px;
  border-radius: 3px 3px 0 0;
  font-size: 11.5px;
  font-weight: 600;
  display: inline-block;
  transition: all 0.15s ease;
}

.sheet-tabs-list li a:hover,
.sheet-tabs-list li.active a {
  background: #ffffff;
  color: var(--excel-green);
}

.main-site-footer {
  background: #0F172A;
  color: #94A3B8;
  padding: 48px 0 24px;
  font-size: 13.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-col h5 {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #94A3B8;
}

.footer-col ul li a:hover {
  color: #ffffff;
}

.footer-bottom-bar {
  border-top: 1px solid #1E293B;
  padding-top: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .cheat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .layout-right-sidebar,
  .layout-left-sidebar {
    grid-template-columns: 1fr;
  }
  .spreadsheet-header-row,
  .spreadsheet-row {
    grid-template-columns: 40px 1fr 130px;
  }
  .spreadsheet-header-row .col-header:nth-child(n+4),
  .spreadsheet-row .cell:nth-child(n+4) {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 30px;
  }
  .cheat-grid {
    grid-template-columns: 1fr;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .ribbon-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 10px 0;
  }
  .ribbon-menu.mobile-open {
    display: flex;
  }
  .header-quick-links {
    display: none;
  }
  .status-bar-inner {
    flex-direction: column;
    gap: 8px;
    align-items: flex-start;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}