/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", "Hiragino Sans", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f0f2f5;
}

/* ===== Header ===== */
header {
  background: #1a1f36;
  color: #fff;
  padding: 0.875rem 1rem;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.back-link {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.875rem;
  white-space: nowrap;
  padding: 0.5rem 0;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color 0.2s;
}

.back-link:hover {
  color: #fff;
}

.header-title h1 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
}

.subtitle {
  font-size: 0.8rem;
  color: #94a3b8;
  margin-top: 0.125rem;
}

/* ===== Main Layout ===== */
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
}

/* ===== Ad Units ===== */
.ad-unit {
  margin: 1.25rem 0;
}

/* ===== Quarter Tabs ===== */
.quarter-tabs {
  background: #fff;
  border-radius: 10px;
  padding: 0.875rem 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

.quarter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.tabs {
  display: flex;
  gap: 0.375rem;
}

.tab-btn {
  min-width: 52px;
  min-height: 44px;
  padding: 0.5rem 0.875rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  background: #f8fafc;
  color: #64748b;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.tab-btn:hover {
  border-color: #4f46e5;
  color: #4f46e5;
}

.tab-btn.active {
  border-color: #4f46e5;
  background: #4f46e5;
  color: #fff;
}

.year-label {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1a1f36;
}

/* ===== Summary Dashboard ===== */
.summary-dashboard {
  background: #fff;
  border-radius: 10px;
  padding: 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.625rem;
}

.summary-card {
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.summary-donut {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
}

.summary-info {
  min-width: 0;
}

.summary-obj-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: #1a1f36;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
}

.summary-rate {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 0.125rem;
}

.summary-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: #94a3b8;
  font-size: 0.9rem;
  padding: 0.5rem;
}

/* Objective color themes */
.theme-blue   { background: #eff6ff; }
.theme-purple { background: #f5f3ff; }
.theme-green  { background: #f0fdf4; }
.theme-orange { background: #fff7ed; }

.theme-blue   .summary-rate { color: #2563eb; }
.theme-purple .summary-rate { color: #7c3aed; }
.theme-green  .summary-rate { color: #16a34a; }
.theme-orange .summary-rate { color: #ea580c; }

/* ===== OKR Board ===== */
.okr-board {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ===== Objective Card ===== */
.obj-card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 6px rgba(0,0,0,0.08);
  overflow: hidden;
}

.obj-card-header {
  padding: 0.875rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid #f1f5f9;
}

.obj-color-bar {
  width: 4px;
  height: 36px;
  border-radius: 2px;
  flex-shrink: 0;
}

.theme-blue   .obj-color-bar { background: #2563eb; }
.theme-purple .obj-color-bar { background: #7c3aed; }
.theme-green  .obj-color-bar { background: #16a34a; }
.theme-orange .obj-color-bar { background: #ea580c; }

.obj-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.obj-title-wrap {
  flex: 1;
  min-width: 0;
}

.obj-title-input {
  width: 100%;
  font-size: 1rem;
  font-weight: 700;
  color: #1a1f36;
  border: none;
  outline: none;
  background: transparent;
  padding: 0;
  min-height: 44px;
  line-height: 44px;
}

.obj-title-input::placeholder {
  color: #94a3b8;
  font-weight: 400;
}

.obj-rate-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  gap: 0.125rem;
}

.obj-donut-wrap {
  width: 48px;
  height: 48px;
}

.obj-rate-label {
  font-size: 0.7rem;
  color: #64748b;
}

.obj-actions {
  display: flex;
  gap: 0.375rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 6px;
  font-size: 1rem;
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  min-width: 44px;
  min-height: 44px;
}

.btn-icon:hover {
  background: #f1f5f9;
  color: #64748b;
}

.btn-icon.delete-obj:hover {
  background: #fef2f2;
  color: #dc2626;
}

/* ===== Key Result List ===== */
.kr-list {
  padding: 0.5rem 1rem 0.75rem;
}

.kr-item {
  padding: 0.625rem 0;
  border-bottom: 1px solid #f1f5f9;
}

.kr-item:last-child {
  border-bottom: none;
}

.kr-row1 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.375rem;
}

.kr-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: #94a3b8;
  width: 20px;
  flex-shrink: 0;
}

.kr-name-input {
  flex: 1;
  font-size: 0.9rem;
  color: #1a1f36;
  border: none;
  border-bottom: 1px solid transparent;
  outline: none;
  background: transparent;
  padding: 0.25rem 0;
  min-height: 44px;
  transition: border-color 0.2s;
}

.kr-name-input:focus {
  border-bottom-color: #4f46e5;
}

.kr-name-input::placeholder {
  color: #94a3b8;
}

.btn-delete-kr {
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  cursor: pointer;
  color: #cbd5e1;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  min-width: 44px;
  min-height: 44px;
  transition: color 0.2s;
}

.btn-delete-kr:hover {
  color: #dc2626;
}

.kr-row2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-left: 28px;
}

.kr-value-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.kr-val-input {
  width: 72px;
  font-size: 0.85rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 0.3rem 0.5rem;
  text-align: center;
  min-height: 44px;
  transition: border-color 0.2s;
}

.kr-val-input:focus {
  outline: none;
  border-color: #4f46e5;
}

.kr-sep {
  color: #94a3b8;
  font-size: 0.85rem;
}

.kr-unit-input {
  width: 64px;
  font-size: 0.85rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 0.3rem 0.5rem;
  text-align: center;
  min-height: 44px;
  transition: border-color 0.2s;
}

.kr-unit-input:focus {
  outline: none;
  border-color: #4f46e5;
}

/* Progress bar */
.kr-progress-wrap {
  flex: 1;
  min-width: 80px;
}

.kr-progress-bar-bg {
  height: 8px;
  background: #f1f5f9;
  border-radius: 4px;
  overflow: hidden;
}

.kr-progress-bar {
  height: 100%;
  border-radius: 4px;
  transition: width 0.4s ease;
}

.kr-progress-bar.red    { background: #ef4444; }
.kr-progress-bar.yellow { background: #f59e0b; }
.kr-progress-bar.green  { background: #22c55e; }

.kr-rate-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: #64748b;
  white-space: nowrap;
  margin-top: 0.25rem;
  text-align: right;
}

/* ===== Add KR Button ===== */
.add-kr-wrap {
  padding: 0.375rem 1rem 0.75rem;
}

.add-kr-btn {
  width: 100%;
  min-height: 44px;
  border: 1.5px dashed #c7d2fe;
  border-radius: 8px;
  background: #f8f9ff;
  color: #6366f1;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.add-kr-btn:hover {
  background: #eef2ff;
  border-color: #6366f1;
}

/* ===== Add Objective Button ===== */
.add-objective-wrap {
  margin: 1rem 0;
}

.add-objective-btn {
  width: 100%;
  min-height: 52px;
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  background: #fff;
  color: #475569;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.add-objective-btn:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: #1a1f36;
}

.add-objective-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== How-to Section ===== */
.howto-section {
  margin-top: 2rem;
  padding: 1.5rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.howto-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1f36;
  margin-bottom: 0.75rem;
  margin-top: 1.25rem;
  padding-bottom: 0.375rem;
  border-bottom: 2px solid #e2e8f0;
}

.howto-section h2:first-child {
  margin-top: 0;
}

.howto-section ol,
.howto-section ul {
  padding-left: 1.25rem;
  color: #475569;
  font-size: 0.95rem;
}

.howto-section li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.howto-section p {
  color: #475569;
  font-size: 0.95rem;
  line-height: 1.8;
}

.legend {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.85rem;
}

.legend.red    { background: #fef2f2; color: #dc2626; }
.legend.yellow { background: #fffbeb; color: #d97706; }
.legend.green  { background: #f0fdf4; color: #16a34a; }

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: #94a3b8;
}

footer a {
  color: #64748b;
  text-decoration: none;
}

footer a:hover {
  color: #1a1f36;
}

footer p + p {
  margin-top: 0.375rem;
}

/* ===== Desktop Layout ===== */
@media (min-width: 640px) {
  .header-title h1 {
    font-size: 1.35rem;
  }

  main {
    padding: 1.5rem 2rem;
  }

  .summary-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .kr-row2 {
    flex-wrap: nowrap;
  }
}

@media (min-width: 768px) {
  .okr-board {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
}