@charset "UTF-8";
/* ========================================
   NPO法人青森未来エネルギー戦略会議
   style.css
======================================== */

:root {
  --color-primary: #1a5f4a;
  --color-primary-dark: #0d3d2e;
  --color-primary-light: #2d8a6a;
  --color-accent: #3498db;
  --color-text: #2c3e50;
  --color-text-light: #5d6d7e;
  --color-bg: #f8faf9;
  --color-white: #ffffff;
  --color-border: #e0e6e3;
  --font-heading: 'Zen Kaku Gothic New', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;
  --max-width: 1200px;
  --section-padding: 80px;
  --section-padding-mobile: 50px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ========================================
   Header
======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 15px 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
}

.header__logo span {
  display: block;
  font-size: 10px;
  font-weight: 400;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
}

.header__nav {
  display: flex;
  gap: 30px;
}

.header__nav a {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
}

.header__nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

.header__nav a:hover::after {
  width: 100%;
}

/* ========================================
   Hero / Main Visual
======================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse at 20% 80%, rgba(52, 152, 219, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(46, 204, 113, 0.1) 0%, transparent 50%);
}

.hero__pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-white);
  padding: 0 30px;
}

.hero__subtitle {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.8;
  margin-bottom: 20px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 30px;
}

.hero__desc {
  font-size: 15px;
  line-height: 2;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--color-white);
  opacity: 0.6;
}

.hero__scroll span {
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-white), transparent);
}

/* ========================================
   Section Common
======================================== */
.section {
  padding: var(--section-padding) 30px;
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__header {
  text-align: center;
  margin-bottom: 60px;
}

.section__label {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 15px;
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

/* ========================================
   Purpose Section
======================================== */
.purpose {
  background: var(--color-white);
}

.purpose__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.purpose__visual {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: 8px;
  overflow: hidden;
}

.purpose__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.purpose__text h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.purpose__text p {
  font-size: 15px;
  line-height: 2;
  color: var(--color-text-light);
}

.purpose__keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.purpose__keyword {
  display: inline-block;
  padding: 8px 16px;
  background: var(--color-bg);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
}

/* ========================================
   Activity Section
======================================== */
.activity {
  background: var(--color-bg);
}

.activity__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.activity__card {
  background: var(--color-white);
  border-radius: 8px;
  padding: 40px 30px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.04);
  border: 1px solid var(--color-border);
}

.activity__card-icon {
  width: 100%;
  aspect-ratio: 4/3;
  margin: 0 auto 25px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-bg);
}

.activity__card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.activity__card-number {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-text-light);
  margin-bottom: 15px;
}

.activity__card h3 {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.activity__card-subtitle {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 15px;
}

.activity__card p {
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-text-light);
}

.activity__card p a {
  color: var(--color-primary-dark);
}

.activity__card p a:hover {
  color: var(--color-primary-light);
}

.activity__card-buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 20px;
}

.activity__card-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all 0.3s ease;
}

.activity__card-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ========================================
   Footer
======================================== */
.footer {
  background: var(--color-primary-dark);
  color: var(--color-white);
  padding: 80px 30px 40px;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}

.footer__info h2 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 25px;
}

.footer__info-item {
  display: flex;
  gap: 15px;
  margin-bottom: 15px;
  font-size: 14px;
  line-height: 1.8;
}

.footer__info-label {
  flex-shrink: 0;
  width: 50px;
  font-weight: 500;
  opacity: 0.7;
}

.footer__info-value {
  opacity: 0.9;
}

.footer__info-value a {
  color: inherit;
  text-decoration: underline;
}

.footer__info-value a:hover {
  text-decoration: none;
}

.footer__map {
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.footer__map iframe {
  width: 100%;
  height: 100%;
  border: 0;
  filter: grayscale(30%);
}

.footer__bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__copyright {
  font-size: 12px;
  opacity: 0.6;
}

.footer__back-top {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  opacity: 0.6;
  cursor: pointer;
}

.footer__back-top:hover {
  opacity: 1;
}

.footer__back-top svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* ========================================
   Responsive
======================================== */
@media (max-width: 1024px) {
  .activity__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: var(--section-padding-mobile);
  }

  .header__inner {
    padding: 12px 20px;
  }

  .header__nav {
    display: none;
  }

  .hero {
    min-height: 500px;
  }

  .hero__content {
    padding: 0 20px;
  }

  .hero__desc {
    font-size: 14px;
  }

  .section {
    padding: var(--section-padding-mobile) 20px;
  }

  .section__header {
    margin-bottom: 40px;
  }

  .purpose__content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .purpose__visual {
    aspect-ratio: 4/3;
  }

  .activity__grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .activity__card {
    padding: 30px 25px;
  }

  .footer {
    padding: 60px 20px 30px;
  }

  .footer__content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer__map {
    aspect-ratio: 16/9;
  }

  .footer__bottom {
    flex-direction: column-reverse;
    gap: 20px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header__logo {
    font-size: 12px;
  }

  .header__logo span {
    font-size: 9px;
  }

  .hero__title {
    font-size: 24px;
  }

  .section__title {
    font-size: 22px;
  }

  .purpose__text h3 {
    font-size: 19px;
  }

  .purpose__keywords {
    gap: 8px;
  }

  .purpose__keyword {
    padding: 6px 12px;
    font-size: 11px;
  }
}