/* Variables */
:root {
  --color-primary:      #2b4b6e;
  --color-primary-dark: #1a3a5c;
  --color-primary-light:#3d5d80;
  --color-accent:       #c04c38;
  --color-accent-light: #d65a46;
  --color-bg:           #f8f6f1;
  --color-bg-alt:       #eeeae3;
  --color-bg-dark:      #e5e0d8;
  --color-text:         #2d2d2d;
  --color-text-light:   #5a5a5a;
  --color-text-muted:   #8a8a8a;
  --color-border:       #d4cfc5;
  --color-white:        #ffffff;

  --font-primary: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "メイリオ", sans-serif;
  --font-accent:  "Shippori Mincho", "游明朝", "YuMincho", serif;
}

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

[hidden] { display: none !important; }

/* Base */
body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.site-header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 4rem 0 3.5rem;
  text-align: center;
}

.site-name {
  font-family: var(--font-accent);
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  min-height: 1.5em;
}

.site-role {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: rgba(255, 255, 255, 0.75);
}

.site-visitors {
  margin-top: 1.2rem;
}

.hits-badge {
  vertical-align: middle;
}

/* Navigation */
.site-nav {
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.nav-list {
  display: flex;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 0.65rem 1.4rem;
  color: var(--color-text-light);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, background-color 0.2s;
  white-space: nowrap;
}

@media (max-width: 760px) {
  .site-nav {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav .container {
    padding-left: 0;
    padding-right: 0;
  }

  .nav-list {
    padding: 0 0.75rem;
  }
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-dark);
}

.nav-link.current {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
  font-weight: 500;
}

/* Section */
.section {
  padding: 4rem 0;
}

.section:nth-child(even) {
  background-color: var(--color-bg-alt);
}

.section-title {
  font-family: var(--font-accent);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.05em;
}

/* About */
.about-text {
  color: var(--color-text-light);
  font-size: 1rem;
  line-height: 2;
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
}

.tag {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  padding: 0.3rem 0.9rem;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
}

/* Comments (Firestore) */
.comments-auth {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.login-status {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.comments-form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.comments-form textarea {
  width: 100%;
  padding: 0.7rem 1rem;
  font-family: var(--font-primary);
  font-size: 0.95rem;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  outline: none;
  resize: vertical;
  transition: border-color 0.2s;
}

.comments-form textarea:focus {
  border-color: var(--color-primary-light);
}

.comments-form-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.comment-error {
  font-size: 0.85rem;
  color: var(--color-accent);
}

.comments-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.comment-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 1rem 1.2rem;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.comment-author {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
}

.comment-date {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-left: auto;
}

.comment-content {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* Blog post list */
.post-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}

.post-list-item {
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.post-list-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.2s;
  height: 100%;
}

.post-list-link:hover {
  background-color: var(--color-bg-dark);
}

.post-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  flex-shrink: 0;
}

.post-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.post-thumb-placeholder {
  width: 100%;
  height: 100%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-border);
  font-family: var(--font-accent);
  font-size: 1.4rem;
  letter-spacing: 0.1em;
}

.post-list-body {
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  flex: 1;
}

.post-list-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.post-list-title {
  font-family: var(--font-accent);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary);
  line-height: 1.5;
}

.post-list-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 0.1rem;
}

.post-list-count {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: auto;
  padding-top: 0.6rem;
}

@media (max-width: 640px) {
  .post-list {
    grid-template-columns: 1fr;
  }
}

.muted-text {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Pager */
.pager {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.35rem;
  margin-top: 2.4rem;
  flex-wrap: wrap;
  font-family: var(--font-primary);
}

.pager-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  padding: 0 0.7rem;
  font-size: 0.88rem;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
  text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.pager-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pager-link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  cursor: default;
}

.pager-link[aria-current="page"]:hover {
  color: var(--color-white);
}

.pager-link.disabled {
  color: var(--color-text-muted);
  pointer-events: none;
  opacity: 0.5;
}

.pager-ellipsis {
  color: var(--color-text-muted);
  padding: 0 0.3rem;
  font-size: 0.88rem;
}

/* Site Guide */
.site-guide {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.site-guide-item {
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.site-guide-link {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  padding: 1rem 1.2rem;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.2s;
}

.site-guide-link:hover {
  background-color: var(--color-bg-dark);
}

.site-guide-title {
  font-family: var(--font-accent);
  font-size: 1rem;
  color: var(--color-primary);
  white-space: nowrap;
  min-width: 5rem;
}

.site-guide-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Contact */
.contact-text {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-white);
  text-decoration: none;
  padding: 0.6rem 2rem;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  transition: background-color 0.2s;
}

.btn:hover {
  background-color: var(--color-accent-light);
}

.btn-secondary {
  background-color: var(--color-primary);
  margin-left: 0.8rem;
}

.btn-secondary:hover {
  background-color: var(--color-primary-dark);
}

/* Comments (Disqus) */
#disqus_thread {
  margin-top: 1rem;
}

/* Activity feed (Home page) */
.activity-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 600px) {
  .activity-grid {
    grid-template-columns: 1fr;
  }
}

.activity-subtitle {
  font-family: var(--font-accent);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: 0.04em;
}

.activity-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.activity-item {
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.activity-item a {
  display: block;
  padding: 0.8rem 1rem;
  text-decoration: none;
  color: inherit;
  transition: background-color 0.2s;
}

.activity-item a:hover {
  background-color: var(--color-bg-dark);
}

.activity-item-source {
  font-size: 0.78rem;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.activity-item-text {
  font-size: 0.85rem;
  color: var(--color-text-light);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.activity-item-meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  padding: 2rem 0;
  font-size: 0.8rem;
}