/* DESIGN.md トークン（Supabaze Inspired） */
:root {
  --color-primary: #3ecf8e;
  --color-primary-deep: #24b47e;
  --color-primary-soft: #4ade80;
  --color-ink: #171717;
  --color-ink-secondary: #212121;
  --color-ink-mute: #707070;
  --color-ink-mute-2: #9a9a9a;
  --color-on-primary: #171717;
  --color-canvas: #ffffff;
  --color-canvas-soft: #fafafa;
  --color-canvas-night: #1c1c1c;
  --hairline: #dfdfdf;
  --hairline-strong: #c7c7c7;
  --hairline-cool: #ededed;
  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-2: 0 8px 24px rgba(0, 0, 0, 0.08);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-ui: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont,
    'Segoe UI', sans-serif;
}

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

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-canvas);
  display: flex;
  flex-direction: column;
}

/* 横並び時はビューポート内でペイン分割し、左 3D に高さが乗る */
@media (min-width: 901px) {
  body {
    height: 100vh;
    overflow: hidden;
  }

  .main-panel {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* Header */
.site-header {
  flex-shrink: 0;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--hairline-cool);
  z-index: 20;
}

.site-header__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px;
}

.brand {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.brand__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  margin-top: 8px;
  flex-shrink: 0;
}

.brand__title {
  margin: 0;
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  line-height: 1.2;
}

.brand__tagline {
  margin: 6px 0 0;
  font-size: 14px;
  font-weight: 400;
  color: var(--color-ink-mute);
  line-height: 1.45;
}

/* Split layout — flex:1 でヘッダー／フッター間を埋め、3D 親に実高を与える */
.layout-split {
  flex: 1 1 0;
  display: flex;
  min-height: 0;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

.hero-visual {
  flex: 1 1 48%;
  min-width: 0;
  min-height: min(52vh, 560px);
  background: var(--color-canvas-soft);
  border-right: 1px solid var(--hairline-cool);
  position: relative;
  overflow: hidden;
}

#grass-canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.main-panel {
  flex: 1 1 52%;
  min-width: 0;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-canvas);
}

.page-main {
  padding: 40px 24px 56px;
}

.container {
  max-width: 640px;
  margin: 0 auto;
}

/* Sections */
.tools-section {
  margin-bottom: 48px;
}

.tools-section:last-of-type {
  margin-bottom: 0;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading__label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-mute-2);
  margin-bottom: 8px;
}

.section-heading__title {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  line-height: 1.2;
}

/* Tool grid */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* Cards — card-feature-light 相当 */
.tool-card {
  background: var(--color-canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-1);
  display: flex;
  flex-direction: column;
  gap: 0;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s ease, transform 0.45s ease,
    box-shadow 0.2s ease, border-color 0.2s ease;
}

.tool-card--visible {
  opacity: 1;
  transform: translateY(0);
}

.tool-card:hover {
  box-shadow: var(--shadow-2);
  border-color: var(--hairline-strong);
}

.tool-card__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.tool-card__icon {
  font-size: 1.5rem;
  color: var(--color-primary-deep);
  line-height: 1;
  margin-top: 2px;
}

.tool-card__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-ink);
}

.tool-card__desc {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-ink-mute);
}

/* Primary button — on-primary テキスト */
.tool-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: auto;
  padding: 10px 16px;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  color: var(--color-on-primary);
  text-decoration: none;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
  width: 100%;
  box-sizing: border-box;
}

.tool-button:hover {
  background: var(--color-primary-deep);
}

.tool-button:active {
  transform: scale(0.99);
}

.tool-button__arrow {
  font-size: 12px;
  opacity: 0.85;
}

/* Footer — footer-light */
.site-footer {
  flex-shrink: 0;
  background: var(--color-canvas);
  border-top: 1px solid var(--hairline-cool);
  padding: 40px 24px 32px;
}

.site-footer__inner {
  max-width: 1280px;
  margin: 0 auto;
  text-align: center;
}

.site-footer__copy {
  margin: 0;
  font-size: 13px;
  color: var(--color-ink-mute);
  line-height: 1.45;
}

.site-footer a {
  color: var(--color-ink-mute);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.site-footer a:hover {
  color: var(--color-ink);
}

/* Responsive */
@media (max-width: 900px) {
  body {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .layout-split {
    flex-direction: column;
    flex: 1 1 auto;
    min-height: 0;
    max-width: none;
  }

  .hero-visual {
    flex: none;
    width: 100%;
    height: 42vh;
    min-height: 280px;
    max-height: 460px;
    border-right: none;
    border-bottom: 1px solid var(--hairline-cool);
  }

  .main-panel {
    flex: 1 1 auto;
    overflow: visible;
    min-height: 0;
  }
}

@media (max-width: 480px) {
  .site-header__inner {
    padding: 14px 16px;
  }

  .page-main {
    padding: 28px 16px 40px;
  }

  .tool-card {
    padding: 20px;
  }
}

/* —— calcNumBags 等サブページ —— */
.container h1 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--color-ink);
}

.calcNumBags-container {
  background-color: var(--color-canvas);
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-1);
  max-width: 700px;
  margin: 2rem auto;
}

.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-ink-secondary);
  font-weight: 500;
}

.input-group input[type='number'] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-family: var(--font-ui);
  color: var(--color-ink);
  background: var(--color-canvas);
}

.calculation-step {
  background-color: var(--color-canvas-soft);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-primary-deep);
}

.calculation-step h2 {
  font-size: 1.2rem;
  color: var(--color-ink);
  margin-bottom: 1rem;
}

.result-display {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 0.75rem;
  text-align: right;
}

.result-display span {
  color: var(--color-primary-deep);
}

.inline-inputs,
.inline-elements {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.inline-inputs > div,
.inline-elements > div {
  flex-grow: 1;
}

.inline-inputs label {
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.inline-elements span {
  font-weight: 600;
}

.final-result .result-display {
  font-size: 1.8rem;
  color: var(--color-primary-deep);
}

.notes {
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--color-ink-mute);
  line-height: 1.5;
  text-align: center;
}

@media screen and (max-width: 768px) {
  .calcNumBags-container {
    padding: 1.5rem;
    margin: 1rem;
  }

  .inline-inputs,
  .inline-elements {
    flex-direction: column;
    align-items: stretch;
  }

  .inline-inputs > div,
  .inline-elements > div {
    margin-bottom: 0.5rem;
  }

  .result-display {
    font-size: 1.3rem;
  }

  .final-result .result-display {
    font-size: 1.6rem;
  }
}

@media screen and (max-width: 480px) {
  .container h1 {
    font-size: 1.5rem;
  }
  .calcNumBags-container {
    padding: 1rem;
  }
  .input-group input[type='number'],
  .result-display,
  .calculation-step h2 {
    font-size: 0.95rem;
  }
  .result-display {
    font-size: 1.1rem;
  }
  .final-result .result-display {
    font-size: 1.3rem;
  }
  .inline-inputs span,
  .inline-elements span {
    margin: 0.5rem 0;
  }
}

.calcNumBags-container form {
  display: flex;
  flex-direction: column;
}

.inline-elements div span {
  color: var(--color-primary-deep);
  font-weight: 400;
}

.inline-inputs > div {
  display: flex;
  flex-direction: column;
}

.inline-inputs > div label {
  margin-bottom: 0.3rem;
}

span[name],
span[id] {
  min-width: 30px;
  display: inline-block;
  text-align: right;
}

.inline-inputs > span,
.inline-elements > span {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-ink-mute);
  align-self: center;
  padding: 0 0.5rem;
}

.calculation-step + .input-group,
.input-group + .calculation-step,
.calculation-step + .calculation-step {
  margin-top: 2rem;
}

.final-result {
  background-color: var(--color-canvas-soft);
  border-left-color: var(--color-primary-deep);
}

.final-result h2 {
  color: var(--color-ink-secondary);
}