:root {
  /* --- Starbucks-inspired 4-tier green --- */
  --green-brand: #006241;
  --green-accent: #00754A;
  --green-house: #1E3932;
  --green-uplift: #2b5148;
  --green-light: #d4e9e2;

  /* --- Surface & Background --- */
  --surface-warm: #f2f0eb;
  --surface-ceramic: #edebe9;
  --surface-white: #ffffff;
  --surface-cool: #f9f9f9;

  /* --- Text --- */
  --text-primary: rgba(0, 0, 0, 0.87);
  --text-secondary: rgba(0, 0, 0, 0.58);
  --text-on-dark: rgba(255, 255, 255, 1);
  --text-on-dark-soft: rgba(255, 255, 255, 0.70);

  /* --- Semantic --- */
  --hit-color: #006241;
  --miss-color: #c82014;
  --skip-color: rgba(0, 0, 0, 0.38);
  --danger: #c82014;
  --gold: #cba258;

  /* --- Component tokens --- */
  --card-radius: 12px;
  --card-shadow: 0px 0px 0.5px 0px rgba(0,0,0,0.14), 0px 1px 1px 0px rgba(0,0,0,0.24);
  --btn-radius: 50px;
  --btn-active-scale: scale(0.95);
  --modal-bg: rgba(0, 0, 0, 0.5);
  --input-border: #d6dbde;
  --input-border-focus: #00754A;

  /* --- Spacing (4px grid) --- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 40px;

  /* --- Typography --- */
  --font-main: 'Inter', 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  --letter-spacing: -0.01em;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background: var(--surface-warm);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  letter-spacing: var(--letter-spacing);
  line-height: 1.5;
}

/* --- Header --- */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px var(--space-3);
  background: var(--green-house);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 2px 2px rgba(0,0,0,0.06), 0 0 2px rgba(0,0,0,0.07);
}

.header-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-on-dark);
}

.hamburger-btn {
  background: none;
  border: none;
  color: var(--text-on-dark);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-2);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  border-radius: 50%;
  transition: background 0.2s ease;
}

.hamburger-btn:active {
  background: rgba(255, 255, 255, 0.1);
}

/* --- Hamburger Menu --- */

.menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-bg);
  z-index: 200;
}

.menu-overlay.open {
  display: block;
}

.menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--surface-white);
  z-index: 201;
  padding: var(--space-4) 0;
  transform: translateX(100%);
  transition: transform 0.2s ease;
  box-shadow: -2px 0 8px rgba(0,0,0,0.15);
}

.menu-overlay.open .menu-panel {
  transform: translateX(0);
}

.menu-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
  min-width: 44px;
  min-height: 44px;
}

.menu-list {
  list-style: none;
}

.menu-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 14px var(--space-4);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 400;
  border-bottom: 1px solid var(--surface-ceramic);
  transition: background 0.15s;
}

.menu-list a:hover,
.menu-list a.active {
  background: var(--surface-warm);
  color: var(--green-brand);
  font-weight: 600;
}

/* --- Main Content --- */

.main-content {
  flex: 1;
  padding: var(--space-3);
  padding-bottom: 80px;
}

/* --- Bottom Tab Bar --- */

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  display: flex;
  background: var(--green-house);
  z-index: 100;
  box-shadow: 0 -1px 3px rgba(0,0,0,0.1);
}

.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0;
  color: var(--text-on-dark-soft);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 400;
  transition: color 0.15s;
  min-height: 56px;
  justify-content: center;
}

.tab-item.active {
  color: var(--text-on-dark);
  font-weight: 600;
}

.tab-icon {
  font-size: 1.4rem;
  margin-bottom: 2px;
}

/* --- Buttons --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px var(--space-4);
  border: 1px solid var(--text-secondary);
  border-radius: var(--btn-radius);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-main);
  letter-spacing: var(--letter-spacing);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
  user-select: none;
}

.btn:active {
  transform: var(--btn-active-scale);
}

.btn-primary {
  background: var(--green-accent);
  border-color: var(--green-accent);
  color: #ffffff;
}

.btn-primary:active {
  transform: var(--btn-active-scale);
  background: var(--green-brand);
}

.btn-outline-primary {
  background: transparent;
  border-color: var(--green-accent);
  color: var(--green-accent);
}

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:active {
  transform: var(--btn-active-scale);
}

.btn-sm {
  padding: 8px var(--space-3);
  font-size: 0.8125rem;
  min-height: 44px;
}

.btn-on-dark {
  border-color: rgba(255, 255, 255, 0.7);
  color: var(--text-on-dark);
}

.btn-on-dark.btn-primary {
  background: var(--surface-white);
  border-color: var(--surface-white);
  color: var(--green-accent);
}

/* --- Modal --- */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-bg);
  z-index: 300;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-box {
  background: var(--surface-white);
  border-radius: var(--card-radius);
  padding: var(--space-4);
  width: 90%;
  max-width: 400px;
  box-shadow: var(--card-shadow);
}

.modal-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--green-brand);
  margin-bottom: var(--space-3);
}

/* --- Form Elements --- */

.form-group {
  margin-bottom: var(--space-3);
}

.form-label {
  display: block;
  margin-bottom: 6px;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  font-weight: 600;
}

.form-input {
  width: 100%;
  padding: 12px;
  background: var(--surface-white);
  border: 1px solid var(--input-border);
  border-radius: var(--space-2);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-main);
  letter-spacing: var(--letter-spacing);
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--input-border-focus);
  box-shadow: 0 0 0 1px var(--input-border-focus);
}

.form-select {
  width: 100%;
  padding: 12px;
  background: var(--surface-white);
  border: 1px solid var(--input-border);
  border-radius: var(--space-2);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-main);
  letter-spacing: var(--letter-spacing);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-select:focus {
  outline: none;
  border-color: var(--input-border-focus);
  box-shadow: 0 0 0 1px var(--input-border-focus);
}

/* --- Confirm Dialog --- */

.confirm-actions {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
  margin-top: var(--space-4);
}

/* --- Utility --- */

.text-center { text-align: center; }
.text-dim { color: var(--text-secondary); }
.mt-8 { margin-top: var(--space-2); }
.mt-16 { margin-top: var(--space-3); }
.mb-16 { margin-bottom: var(--space-3); }
.gap-8 { gap: var(--space-2); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* --- Members --- */

.members-empty {
  text-align: center;
  padding: var(--space-6) var(--space-4);
}

.members-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
}

.members-list {
  list-style: none;
}

.member-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--surface-white);
  border-radius: var(--card-radius);
  margin-bottom: var(--space-2);
  box-shadow: var(--card-shadow);
  transition: background 0.1s;
}

.member-item.dragging {
  opacity: 0.4;
}

.member-item.drag-over {
  border-top: 2px solid var(--green-accent);
}

.member-drag-handle {
  cursor: grab;
  color: var(--text-secondary);
  font-size: 1.2rem;
  padding: var(--space-1);
  touch-action: none;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.member-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.member-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.member-grade {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.member-actions {
  display: flex;
  gap: var(--space-2);
}

/* --- History --- */

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.history-item {
  padding: var(--space-3);
  background: var(--surface-white);
  border-radius: var(--card-radius);
  cursor: pointer;
  box-shadow: var(--card-shadow);
  transition: background 0.1s;
  min-height: 44px;
}

.history-item:active {
  transform: var(--btn-active-scale);
}

.history-item.active {
  background: var(--green-light);
  border-left: 3px solid var(--green-accent);
}

.history-date {
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 600;
}

.history-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.history-tab {
  flex: 1;
  padding: 10px;
  background: var(--surface-white);
  border: 1px solid var(--input-border);
  border-radius: var(--btn-radius);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 44px;
}

.history-tab:active {
  transform: var(--btn-active-scale);
}

.history-tab.active {
  background: var(--green-accent);
  color: #ffffff;
  border-color: var(--green-accent);
}

/* --- Summary Table --- */

.summary-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-white);
  border-radius: var(--card-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.summary-table th,
.summary-table td {
  padding: 12px var(--space-2);
  text-align: left;
  font-size: 0.875rem;
  border-bottom: 1px solid var(--surface-ceramic);
}

.summary-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--surface-cool);
}

.summary-table td {
  color: var(--text-primary);
}

/* --- Scrollbar (Webkit) --- */

::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: var(--surface-warm);
}

::-webkit-scrollbar-thumb {
  background: var(--green-uplift);
  border-radius: 2px;
}

/* --- Edit History --- */

.empty-message {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--text-secondary);
}

.edit-history-filters {
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-2);
}

.edit-history-select {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--green-light);
  border-radius: var(--card-radius);
  background: var(--surface-white);
  font-size: 0.875rem;
  color: var(--text-primary);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.edit-history-date {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--green-light);
  border-radius: var(--card-radius);
  background: var(--surface-white);
  font-size: 0.875rem;
  color: var(--text-primary);
}

.edit-history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.edit-history-item {
  padding: var(--space-3);
  background: var(--surface-white);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

.edit-history-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-1);
}

.edit-history-detail {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.edit-history-member {
  font-weight: 600;
  font-size: 0.9375rem;
}

.edit-history-change {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* --- Dashboard --- */

.dashboard-summary {
  background: var(--green-house);
  border-radius: var(--card-radius);
  padding: var(--space-4);
  text-align: center;
  margin-bottom: var(--space-3);
}

.summary-rate {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--text-on-dark);
}

.summary-detail {
  font-size: 0.875rem;
  color: var(--text-on-dark-soft);
  margin-top: var(--space-1);
}

.dashboard-controls {
  margin-bottom: var(--space-3);
}

.dashboard-mode-tabs {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.mode-tab {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border: 2px solid var(--green-accent);
  border-radius: var(--btn-radius);
  background: transparent;
  color: var(--green-accent);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.mode-tab.active {
  background: var(--green-accent);
  color: var(--text-on-dark);
}

.dashboard-period-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
  background: var(--surface-ceramic);
  border-radius: var(--btn-radius);
  padding: 3px;
}

.period-tab {
  flex: 1;
  padding: var(--space-2) var(--space-2);
  border: none;
  border-radius: var(--btn-radius);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.period-tab.active {
  background: var(--surface-white);
  color: var(--text-primary);
  box-shadow: var(--card-shadow);
}

.dashboard-chart-container {
  background: var(--surface-white);
  border-radius: var(--card-radius);
  padding: var(--space-3);
  box-shadow: var(--card-shadow);
  height: 300px;
}

.position-stats {
  margin-top: var(--space-3);
}

.position-stats-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.position-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

.position-stat-card {
  background: var(--surface-white);
  border-radius: var(--card-radius);
  padding: var(--space-3);
  box-shadow: var(--card-shadow);
  text-align: center;
}

.position-stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.position-stat-rate {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--green-brand);
}

.position-stat-detail {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}