/* ============================================
   FAA - エアコンお掃除ナビ
   Design System
   ============================================ */

/* --- Variables --- */
:root {
  --color-primary: #0ea5e9;
  --color-primary-dark: #0284c7;
  --color-primary-light: #e0f2fe;
  --color-accent: #f97316;
  --color-accent-light: #fff7ed;
  --color-success: #22c55e;
  --color-bg: #fafbfc;
  --color-white: #ffffff;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-yui: #ec4899;
  --color-yui-bg: #fdf2f8;
  --font-main: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --max-width: 800px;
  --nav-height: 60px;
}

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

/* --- Base --- */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  height: var(--nav-height);
}

.nav__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-text);
}

.nav__logo:hover {
  color: var(--color-primary);
}

.nav__logo-icon {
  font-size: 1.4rem;
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav__links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav__link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

@media (max-width: 768px) {
  .nav__toggle { display: block; }
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }
  .nav__links.is-open { display: flex; }
}

/* --- Main --- */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* --- Article --- */
.article__header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.article__category {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.article__title {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

.article__date {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* --- Article Body --- */
.article__body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-primary-light);
  color: var(--color-text);
}

.article__body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 2rem 0 0.8rem;
  padding-left: 0.8rem;
  border-left: 4px solid var(--color-primary);
}

.article__body p {
  margin-bottom: 1.2rem;
}

.article__body ul, .article__body ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article__body li {
  margin-bottom: 0.4rem;
}

.article__body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.article__body th {
  background: var(--color-primary-light);
  padding: 0.7rem 1rem;
  text-align: left;
  font-weight: 700;
  border: 1px solid var(--color-border);
}

.article__body td {
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-border);
}

.article__body img {
  margin: 1rem 0;
}

/* --- PR Notice --- */
.pr-notice {
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

/* --- Yui Memo --- */
.yui-memo {
  background: var(--color-yui-bg);
  border-left: 4px solid var(--color-yui);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1.2rem 1.5rem;
  margin: 1.5rem 0;
}

.yui-memo__label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-yui);
  margin-bottom: 0.4rem;
}

.yui-memo p:last-child {
  margin-bottom: 0;
}

/* --- CTA Box --- */
.cta-box {
  background: linear-gradient(135deg, var(--color-primary-light), #dbeafe);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  text-align: center;
  margin: 2rem 0;
}

.cta-box__text {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.cta-box__button {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.8rem 2rem;
  border-radius: 50px;
  transition: all 0.3s;
  box-shadow: 0 4px 6px rgba(249, 115, 22, 0.3);
}

.cta-box__button:hover {
  background: #ea580c;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(249, 115, 22, 0.4);
}

/* --- Article Footer --- */
.article__footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

/* --- Footer --- */
.footer {
  background: #1e293b;
  color: #94a3b8;
  padding: 3rem 0 2rem;
  margin-top: 4rem;
}

.footer__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.footer__heading {
  color: var(--color-white);
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
}

.footer__links {
  list-style: none;
}

.footer__link {
  color: #94a3b8;
  font-size: 0.85rem;
  line-height: 2;
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__brand-desc {
  font-size: 0.85rem;
  margin-top: 0.5rem;
  line-height: 1.6;
}

.footer__bottom {
  border-top: 1px solid #334155;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
}

.footer__disclaimer {
  margin-bottom: 0.5rem;
  font-size: 0.75rem;
}

/* --- Homepage --- */
.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero__title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 1rem;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.card {
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.card__title a {
  color: var(--color-text);
}

.card__title a:hover {
  color: var(--color-primary);
}

.card__desc {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.card__date {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 0.5rem;
}

.section-heading {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 3rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-primary);
}