:root {
  --excel-green: #217346;
  --border-color: #d4d4d4;
  --grid-line-color: #e1e1e1;
  --header-bg: #f8f9fa;
  --header-text: #333;
  --footer-bg: #f3f3f3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  font-size: 13px;
  height: 100vh;
  overflow: hidden;
  color: #000;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* Landscape Warning - Shows when device is in landscape mode */
.landscape-warning {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #217346 0%, #1a5c38 100%);
  z-index: 9999;
  justify-content: center;
  align-items: center;
}

.landscape-warning-content {
  text-align: center;
  color: white;
  padding: 40px;
}

.landscape-warning-icon {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  animation: rotate-phone 2s ease-in-out infinite;
}

@keyframes rotate-phone {
  0%,
  100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-15deg);
  }
  75% {
    transform: rotate(15deg);
  }
}

.landscape-warning p {
  font-size: 20px;
  font-weight: 500;
  margin: 0;
  line-height: 1.5;
}

/* Show warning when in landscape mode */
@media screen and (orientation: landscape) {
  .landscape-warning {
    display: flex;
  }
  .app-container {
    display: none;
  }
}

/* For screens wider than tall (desktop/tablet in landscape) */
@media screen and (min-aspect-ratio: 1/1) {
  .landscape-warning {
    display: flex;
  }
  .app-container {
    display: none;
  }
}

/* --- Formula Bar --- */
.excel-header {
  background: #fff;
  border-bottom: 1px solid var(--border-color);
  padding: 2px 0;
  flex: 0 0 auto;
  position: relative;
}

.header-logo {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  width: 88px;
  height: auto;
  object-fit: contain;
  cursor: pointer;
}

.formula-bar-wrapper {
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 10px;
}

.name-box {
  width: 60px;
  height: 100%;
  display: flex;
  align-items: center;
  border: 1px solid transparent;
  font-size: 13px;
  color: #333;
  padding-left: 5px;
}
.name-box:hover {
  border-color: var(--border-color);
}

.formula-icon-separator {
  margin: 0 10px;
  color: #ccc;
  display: flex;
  align-items: center;
}

.fx-text {
  font-weight: bold;
  font-style: italic;
  font-family: serif;
  color: var(--excel-green);
  margin-right: 15px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.2s ease;
}
.fx-text:hover {
  background: var(--excel-green);
  color: white;
}
.fx-icon {
  width: 14px;
  height: 14px;
  display: none; /* using text for better match */
}

.formula-divider {
  width: 1px;
  height: 16px;
  background: #e1e1e1;
  margin-right: 10px;
}

.formula-input {
  flex: 1;
  height: 100%;
  display: flex;
  align-items: center;
  border: 1px solid transparent; /* default no border */
  outline: none;
  font-size: 13px;
  padding-left: 5px;
}
.formula-input:focus {
  border: 1px solid var(--excel-green);
}

/* --- Main Grid --- */
.spreadsheet-container {
  flex: 1;
  overflow: auto;
  display: grid;
  /* We will set grid-template-columns/rows in JS or have defaults */
  background: #fff;
  position: relative;
  /* Default grid for empty state */
  grid-template-columns: 50px repeat(26, 100px);
  grid-template-rows: 25px repeat(100, 22px);
}

/* Headers */
.header-col {
  background: var(--header-bg);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  color: #666;
  position: sticky;
  top: 0;
  z-index: 10;
  user-select: none;
}
.header-col.active {
  background: #e1e1e1;
  color: var(--excel-green);
  border-bottom: 2px solid var(--excel-green);
}

.header-row {
  background: var(--header-bg);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  position: sticky;
  left: 0;
  z-index: 10;
  user-select: none;
}

.corner-header {
  background: var(--header-bg);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  left: 0;
  z-index: 20;
  /* little triangle */
  background-image: linear-gradient(135deg, transparent 50%, #bbb 50%);
  background-size: 10px 10px;
  background-repeat: no-repeat;
  background-position: bottom 2px right 2px;
}

/* Cells */
.cell {
  border-right: 1px solid var(--grid-line-color);
  border-bottom: 1px solid var(--grid-line-color);
  outline: none;
  padding: 0 4px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  overflow: hidden;
  font-size: 13px;
  background: #fff;
  cursor: cell;
}

/* Selection Box */
.selection-box {
  position: absolute;
  border: 2px solid var(--excel-green);
  pointer-events: none; /* allow clicking through to cell */
  z-index: 5;
  /* The fill handle */
}
.selection-handle {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--excel-green);
  bottom: -5px;
  right: -5px;
  border: 1px solid #fff;
  cursor: crosshair;
  pointer-events: auto;
}

/* --- Footer --- */
.status-bar {
  height: 35px;
  background: var(--footer-bg);
  display: flex;
  align-items: center;
  padding: 0 10px;
  border-top: 1px solid #e1e1e1;
  flex: 0 0 auto;
}

.sheet-controls {
  display: flex;
  gap: 15px;
  margin-right: 15px;
  color: #999;
}
.nav-btn {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 14px; /* Increased slightly */
  font-weight: bold;
  padding: 0;
  transition: color 0.2s;
}

#btn-export {
  color: var(--excel-green);
}
#btn-export:hover {
  color: #165c36;
}

#btn-import {
  color: #d93025; /* Red */
}
#btn-import:hover {
  color: #a50e0e;
}

.sheet-tabs-list {
  display: flex;
  height: 100%;
}

.sheet-tab {
  padding: 0 20px;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 13px;
  color: #666;
  height: 100%;
  position: relative;
  border-right: 1px solid transparent;
}
.sheet-tab:hover {
  background: #e1e1e1;
}
.sheet-tab.active {
  background: #fff;
  color: var(--excel-green);
  font-weight: 600;
  box-shadow: inset 0 -3px 0 0 var(--excel-green); /* The underline */
}

.new-sheet-btn {
  width: 30px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  color: #666;
  margin-left: 5px;
}
.new-sheet-btn:hover .plus-icon {
  background: #ccc;
}

.plus-icon {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  padding-bottom: 2px;
}

.scroll-spacer {
  flex: 1;
}

/* Page Footer */
.page-footer {
  text-align: center;
  padding: 8px 10px;
  font-size: 12px;
  color: #888;
  background: #f8f9fa;
  border-top: 1px solid var(--border-color);
  flex: 0 0 auto;
}

.page-footer a {
  color: var(--excel-green);
  text-decoration: none;
  font-weight: 500;
}

.page-footer a:hover {
  text-decoration: underline;
}

/* ===== QR Modal Styles ===== */
.qr-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(5px);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.qr-modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.qr-modal {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow: hidden;
  animation: qrModalIn 0.3s ease;
}

@keyframes qrModalIn {
  from {
    transform: scale(0.9) translateY(20px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.qr-modal-header {
  background: var(--excel-green);
  color: white;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.qr-modal-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}
.qr-modal-close {
  font-size: 28px;
  cursor: pointer;
  opacity: 0.8;
  transition: opacity 0.2s;
  line-height: 1;
}
.qr-modal-close:hover {
  opacity: 1;
}

.qr-modal-body {
  padding: 20px;
  max-height: calc(90vh - 60px);
  overflow-y: auto;
}

.qr-upper-section {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.qr-card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  padding: 12px;
  padding-bottom: 0;
  flex: 1;
  min-width: 0;
  border: 1px solid #e1e8f0;
  position: relative;
}

.qr-zoom-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid #e1e8f0;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  z-index: 10;
  transition: all 0.2s ease;
  color: var(--excel-green);
}
.qr-zoom-btn:hover {
  background: var(--excel-green);
  color: white;
  border-color: var(--excel-green);
  transform: scale(1.1);
}
.qr-zoom-btn svg {
  width: 14px;
  height: 14px;
}

.qr-container {
  width: 100%;
  aspect-ratio: 1;
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 8px;
}
.qr-container img,
.qr-container canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

.qr-card-footer {
  background-color: var(--excel-green);
  color: white;
  text-align: center;
  padding: 12px 8px;
  margin-top: 12px;
  margin-left: -12px;
  margin-right: -12px;
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
}
.qr-card-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 2px;
}
.qr-card-subtitle {
  font-size: 13px;
  opacity: 0.9;
}

.qr-right-menu {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 10px;
  flex: 1;
  min-width: 0;
  height: 200px;
  max-height: 200px;
  overflow-y: auto;
  overflow-x: hidden;
  border: 1px solid #e1e8f0;
  border-radius: 8px;
  background: #fafbfc;
}
.qr-right-menu::-webkit-scrollbar {
  width: 6px;
}
.qr-right-menu::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 3px;
}
.qr-right-menu::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 3px;
}
.qr-right-menu::-webkit-scrollbar-thumb:hover {
  background: #a1a1a1;
}

.qr-radio-item {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 14px;
  color: #333;
  transition: transform 0.2s ease;
}
.qr-radio-item:hover {
  transform: translateX(3px);
}
.qr-radio-item input {
  display: none;
}
.qr-custom-radio {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid #ccc;
  margin-right: 10px;
  background: #f5f5f5;
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s;
}
.qr-radio-item input:checked + .qr-custom-radio {
  background: var(--excel-green);
  border-color: var(--excel-green);
}
.qr-radio-item input:checked + .qr-custom-radio::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}

.qr-bottom-nav {
  display: flex;
  gap: 15px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding: 15px 5px;
  margin-top: 15px;
  border-top: 1px solid #e1e8f0;
}
.qr-bottom-nav::-webkit-scrollbar {
  display: none;
}

.qr-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  min-width: 50px;
  user-select: none;
  transition: transform 0.2s ease;
}
.qr-nav-item:hover {
  transform: scale(1.05);
}
.qr-nav-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #f0f0f0;
  border: 2px solid #ccc;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s;
}
.qr-nav-text {
  font-size: 12px;
  font-weight: 600;
  color: #555;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 2px;
  max-height: 70px;
  overflow: hidden;
}
.qr-nav-item.active .qr-nav-circle {
  background: var(--excel-green);
  border-color: var(--excel-green);
  transform: scale(1.1);
}
.qr-nav-item.active .qr-nav-circle::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-top: -2px;
}
.qr-nav-item.active .qr-nav-text {
  color: var(--excel-green);
}

/* Fullscreen QR Overlay */
.qr-fullscreen-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #fefefe;
  z-index: 2000;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.qr-fullscreen-overlay.active {
  opacity: 1;
  pointer-events: auto;
}
.qr-fullscreen-content {
  position: relative;
  animation: qrModalIn 0.3s ease;
}
.qr-fullscreen-close {
  position: absolute;
  top: -45px;
  right: 0;
  color: #333;
  font-size: 40px;
  cursor: pointer;
  opacity: 0.7;
  transition:
    opacity 0.2s,
    transform 0.2s;
  line-height: 1;
}
.qr-fullscreen-close:hover {
  opacity: 1;
  transform: scale(1.1);
}
.qr-fullscreen-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  min-width: 280px;
  max-width: 90vw;
}
.qr-fullscreen-qr-container {
  background: #fff;
  padding: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.qr-fullscreen-qr-container img,
.qr-fullscreen-qr-container canvas {
  max-width: 70vw;
  max-height: 55vh;
  display: block;
}
.qr-fullscreen-footer {
  background-color: var(--excel-green);
  color: white;
  text-align: center;
  padding: 20px 25px;
}
.qr-fullscreen-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}
.qr-fullscreen-subtitle {
  font-size: 18px;
  opacity: 0.9;
}