:root {
  --green-900: #1b3a1f;
  --green-700: #2e6b34;
  --green-600: #3d8c44;
  --green-500: #4caf50;
  --green-100: #e7f3e3;
  --brown-800: #4a3722;
  --brown-600: #6d4c33;
  --brown-200: #ebe0d1;
  --sand: #fbfaf5;
  --sun: #f0930c;
  --sun-dark: #c4720a;
  --ink: #2b2b22;
  --ink-soft: #5a5748;
  --warn-bg: #fff4e0;
  --warn-border: #e8a33d;
  --card-shadow: 0 2px 10px rgba(45, 35, 15, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  background: var(--sand);
  color: var(--ink);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--green-700); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--green-900);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
}
.brand:hover { text-decoration: none; opacity: 0.9; }
.brand span {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--green-100);
  letter-spacing: 0.02em;
}

.main-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.main-nav a {
  color: #eef4ec;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
}
.main-nav a:hover { background: rgba(255,255,255,0.12); text-decoration: none; }
.main-nav a.active {
  background: var(--sun);
  color: #2a1a00;
}

/* Hero */
.hero {
  padding: 52px 0 40px;
  background: linear-gradient(160deg, var(--green-700), var(--green-600));
  color: #fff;
}
.hero.hero-summer { background: linear-gradient(160deg, #1f6b2f, var(--sun-dark)); }
.hero.hero-spring { background: linear-gradient(160deg, #4c8a3f, #8fbf5a); }
.hero.hero-autumn { background: linear-gradient(160deg, #8a5a2a, #c4842f); }
.hero.hero-winter { background: linear-gradient(160deg, #3a5468, #6e8ba3); }
.hero.hero-work { background: linear-gradient(160deg, var(--brown-800), var(--brown-600)); }

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: rgba(255,255,255,0.18);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: 1.9rem;
  margin: 0 0 12px;
  font-weight: 800;
  line-height: 1.5;
}
.hero p { margin: 0; font-size: 1.02rem; opacity: 0.95; max-width: 640px; }

/* Sections */
section { padding: 44px 0; }
section.tight { padding: 28px 0; }
h2.section-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--green-900);
  border-left: 6px solid var(--sun);
  padding-left: 12px;
  margin: 0 0 22px;
}
h3.sub-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brown-800);
  margin: 30px 0 10px;
}

/* Season nav cards */
.season-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 720px) {
  .season-grid { grid-template-columns: repeat(2, 1fr); }
}
.season-card {
  display: block;
  border-radius: var(--radius);
  padding: 20px 16px;
  color: #fff;
  box-shadow: var(--card-shadow);
  transition: transform 0.15s ease;
}
.season-card:hover { transform: translateY(-3px); text-decoration: none; }
.season-card .icon { font-size: 1.8rem; }
.season-card .label { font-weight: 800; font-size: 1.05rem; margin: 8px 0 2px; }
.season-card .months { font-size: 0.82rem; opacity: 0.9; }
.season-card.spring { background: linear-gradient(160deg, #5a9a49, #8fbf5a); }
.season-card.summer { background: linear-gradient(160deg, #2f7a3a, var(--sun)); }
.season-card.autumn { background: linear-gradient(160deg, #a06a2e, #c4842f); }
.season-card.winter { background: linear-gradient(160deg, #3a5468, #6e8ba3); }
.season-card.current { outline: 3px solid var(--sun); outline-offset: 3px; }

/* Task cards (linking to work detail pages) */
.task-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 720px) {
  .task-grid { grid-template-columns: 1fr; }
}
.task-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--card-shadow);
  border: 1px solid #ece5d5;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.task-card .icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}
.task-card h4 { margin: 0 0 6px; font-size: 1.02rem; color: var(--green-900); }
.task-card p { margin: 0 0 8px; font-size: 0.9rem; color: var(--ink-soft); }
.task-card a.more { font-size: 0.86rem; font-weight: 700; }

/* Month blocks */
.month-block {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid #ece5d5;
  padding: 22px 24px;
  margin-bottom: 20px;
}
.month-block h3 {
  margin: 0 0 4px;
  color: var(--sun-dark);
  font-size: 1.15rem;
  font-weight: 800;
}
.month-block .month-sub { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 14px; }
.month-block ul { margin: 0; padding-left: 1.2em; }
.month-block li { margin-bottom: 8px; }
.month-block li a { font-weight: 700; }

/* Callout boxes */
.callout {
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 20px 0;
  border: 1px solid #d9ecd4;
  background: var(--green-100);
}
.callout.warn { background: var(--warn-bg); border-color: var(--warn-border); }
.callout h4 { margin: 0 0 8px; font-size: 0.95rem; font-weight: 800; }
.callout.warn h4 { color: #8a4f0c; }
.callout:not(.warn) h4 { color: var(--green-900); }
.callout p, .callout ul { margin: 0; font-size: 0.92rem; }
.callout ul { padding-left: 1.2em; }
.callout li { margin-bottom: 6px; }

/* Key numbers strip */
.numbers-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 22px 0;
}
.number-box {
  background: #fff;
  border: 1px solid #ece5d5;
  border-radius: var(--radius);
  padding: 14px 16px;
  text-align: center;
}
.number-box .val { font-size: 1.4rem; font-weight: 800; color: var(--sun-dark); }
.number-box .lbl { font-size: 0.78rem; color: var(--ink-soft); margin-top: 2px; }

/* Step list */
ol.steps { padding-left: 1.3em; }
ol.steps li { margin-bottom: 14px; }
ol.steps li strong { color: var(--green-900); }

/* Related links */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 720px) {
  .related-grid { grid-template-columns: 1fr; }
}
.related-card {
  background: #fff;
  border: 1px solid #ece5d5;
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--green-900);
  box-shadow: var(--card-shadow);
}
.related-card:hover { text-decoration: none; background: var(--green-100); }

/* Work index grid */
.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 720px) {
  .work-grid { grid-template-columns: 1fr; }
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.breadcrumb a { color: var(--ink-soft); }

/* Back link */
.back-link {
  display: inline-block;
  margin-top: 10px;
  font-weight: 700;
}

/* Table */
table.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.88rem;
}
table.data-table th, table.data-table td {
  border: 1px solid #ece5d5;
  padding: 8px 10px;
  text-align: left;
}
table.data-table th { background: var(--green-100); color: var(--green-900); }

/* Footer */
.site-footer {
  background: var(--brown-800);
  color: #ecdfc8;
  padding: 30px 0;
  margin-top: 40px;
}
.site-footer .container { font-size: 0.82rem; line-height: 1.8; }
.site-footer a { color: #f5deb3; }