/* ============================================
   Micro Plastics - Research Media Design
   ============================================ */

/* === Base Reset & Variables === */
:root {
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-accent: #4fd1c5;
  --color-accent-light: #b2f5ea;
  --color-bg: #f7fafc;
  --color-bg-card: #ffffff;
  --color-text: #2d3748;
  --color-text-muted: #718096;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 15px;
  min-height: 100vh;
  /* 薄い粒子感のある背景 */
  background-image:
    radial-gradient(circle at 20% 50%, rgba(79, 209, 197, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(26, 54, 93, 0.03) 0%, transparent 50%);
}

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

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

a:visited {
  color: var(--color-primary);
}

/* === Container === */
#contener {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

/* === Header === */
#head {
  background: linear-gradient(135deg, rgba(26, 54, 93, 0.85) 0%, rgba(44, 82, 130, 0.85) 100%),
              url("img/h1-bg.jpg") center / cover no-repeat;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin-bottom: 32px;
  position: relative;
  overflow: hidden;
}

#head h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  position: relative;
}

#head h1 a {
  color: #ffffff;
}

#head h1 a:hover {
  color: var(--color-accent-light);
}

#head p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.03em;
  position: relative;
}

/* === Layout: Side + Content === */
#side {
  float: left;
  width: 220px;
  padding: 0;
  margin: 0 0 24px 0;
  border: none;
}

#side ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

#side li {
  margin-bottom: 8px;
  list-style: none !important;
}

/* Home link */
#side li:first-child a {
  display: block;
  width: 180px;
  text-align: left;
  padding: 10px 16px 10px 30px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-weight: 500;
  font-size: 14px;
  color: var(--color-primary);
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

#side li:first-child a:hover {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Category pills */
#side li.down {
  position: relative;
  padding-left: 0;
}

#side li.down::before {
  display: none;
}

#side li.down a {
  display: flex;
  align-items: center;
  width: 180px;
  padding: 10px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-size: 14px;
  color: var(--color-text);
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

#side li.down a::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-right: 8px;
  flex-shrink: 0;
}

#side li.down a:hover {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

#side li.down a:hover::before {
  background: var(--color-accent-light);
}

/* === Content Area === */
#content {
  float: left;
  width: calc(100% - 244px);
  margin-left: 24px;
  padding: 0;
  border: none;
  background: transparent;
}

/* === Article Cards === */
article.card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all 0.25s ease;
}

article.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-accent);
}

#content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.5;
  margin: 0 0 12px 0;
  padding: 0;
  border: none;
  border-bottom: none;
}

.card-body {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.postdate {
  display: inline-block;
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 4px 12px;
  background: var(--color-bg);
  border-radius: 12px;
}

/* === Admin Forms === */
#content form {
  background: var(--color-bg-card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
  border: 1px dashed var(--color-border);
}

#content input[type="text"],
#content textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font-sans);
  margin: 8px 0 16px;
  transition: border-color 0.2s ease;
}

#content input[type="text"]:focus,
#content textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

#content textarea {
  min-height: 100px;
  resize: vertical;
}

#content input[type="submit"] {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 10px 24px;
  border-radius: 20px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#content input[type="submit"]:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

#side form {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

#side input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 13px;
  margin: 8px 0;
}

#side input[type="submit"] {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  padding: 8px 16px;
  border-radius: 16px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.2s ease;
}

#side input[type="submit"]:hover {
  background: var(--color-primary-light);
}

/* === Footer === */
#footer {
  clear: both;
  max-width: 960px;
  margin: 48px auto 0;
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  background: transparent;
  width: auto;
}

/* === Clear === */
br[clear="all"] {
  display: none;
}

/* === Responsive === */
@media screen and (max-width: 768px) {
  #contener {
    padding: 16px;
  }

  #head {
    padding: 28px 20px;
    margin-bottom: 16px;
  }

  #head h1 {
    font-size: 22px;
  }

  #side {
    float: none;
    width: 100%;
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  #side ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  #side li {
    margin-bottom: 0;
  }

  #side li:first-child a {
    width: auto;
    padding: 8px 16px;
    font-size: 13px;
  }

  #side li.down a {
    width: auto;
    padding: 8px 16px;
    font-size: 13px;
  }

  #content {
    float: none;
    width: 100%;
    margin-left: 0;
  }

  article.card {
    padding: 20px;
  }

  #content h3 {
    font-size: 16px;
  }

  #footer {
    margin-top: 32px;
  }
}