/* ============================================================
   我们的小窝 — 双人博客主页面
   文章列表 / 作者筛选 / 标签筛选 / 年份归档
   ============================================================ */

:root {
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
          "Segoe UI", system-ui, sans-serif;
  --white-accent: #7aa6d4;
  --brown-accent: #d49356;
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --text: #4a4f5c;
  --muted: #7a8aa0;
  --heading: #3f5a72;
}

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

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: linear-gradient(172deg, #d3e8f4 0%, #e7f0d6 72%, #eef4e1 100%);
  background-attachment: fixed;
}

.is-hidden { display: none !important; }

.bi-bg {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.bi-cloud {
  position: absolute;
  background: rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  filter: blur(2px);
}
.bi-cloud::before,
.bi-cloud::after {
  content: "";
  position: absolute;
  background: inherit;
  border-radius: 50%;
}
.bi-cloud::before { width: 60%; height: 150%; top: -40%; left: 14%; }
.bi-cloud::after  { width: 46%; height: 130%; top: -26%; right: 16%; }
.bi-cloud--1 {
  width: 150px; height: 54px; top: 8%; left: -40px;
  animation: bi-drift 95s linear infinite;
}
.bi-cloud--2 {
  width: 112px; height: 42px; top: 30%; right: -36px;
  animation: bi-drift 120s linear infinite reverse;
}
.bi-cloud--3 {
  width: 132px; height: 48px; top: 72%; left: -52px;
  animation: bi-drift 108s linear infinite;
}
@keyframes bi-drift {
  from { transform: translateX(0); }
  to   { transform: translateX(125vw); }
}

.bi-top {
  position: fixed;
  top: 18px; left: 18px; right: 18px;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  pointer-events: none;
}
.bi-back,
.bi-nav {
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 4px 14px rgba(70, 80, 110, 0.16);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.bi-back {
  padding: 9px 16px;
  border-radius: 999px;
  color: #5b6478;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.2s ease;
}
.bi-back:hover { transform: translateY(-2px); background: #ffffff; }
.bi-nav {
  display: flex;
  gap: 6px;
  padding: 6px;
  border-radius: 999px;
}
.bi-nav__link {
  padding: 7px 14px;
  border-radius: 999px;
  color: #647084;
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.bi-nav__link:hover { transform: translateY(-2px); }
.bi-nav__link.is-active {
  background: #ffffff;
  color: #e8895b;
  box-shadow: 0 3px 10px rgba(70, 80, 110, 0.14);
}

.bi-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 720px) 282px;
  gap: 80px;
  max-width: 1140px;
  margin: 0 auto;
  padding: 126px 24px 96px;
}

.bi-head { margin-bottom: 28px; }
.bi-kicker {
  margin-bottom: 12px;
  color: #7f91a6;
  font-size: 13px;
  font-weight: 650;
}
.bi-head h1 {
  color: var(--heading);
  font-size: 42px;
  line-height: 1.18;
  font-weight: 600;
}
.bi-count {
  margin-top: 13px;
  color: #7a8aa0;
  font-size: 14px;
  font-weight: 600;
}

.bi-toolbar {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  margin-bottom: 34px;
}
.bi-filter,
.bi-years,
.bi-upload-toggle {
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  color: #647084;
  box-shadow: 0 3px 10px rgba(70, 80, 110, 0.12);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
  transition: transform 0.15s var(--spring), background 0.2s ease, color 0.2s ease;
}
.bi-filter {
  padding: 9px 15px;
  cursor: pointer;
}
.bi-upload-toggle {
  padding: 9px 15px;
  cursor: pointer;
}
.bi-years {
  margin-left: auto;
  padding: 9px 16px;
}
.bi-filter:hover,
.bi-years:hover,
.bi-upload-toggle:hover { transform: translateY(-2px); background: #ffffff; }
.bi-filter.is-active {
  background: #ffffff;
  color: #e8895b;
}
.bi-filter--white.is-active { color: #4f85b8; }
.bi-filter--brown.is-active { color: #b6783c; }
.bi-upload-toggle[aria-expanded="true"] {
  background: #ffffff;
  color: #4f85b8;
}

.bi-upload {
  margin: -14px 0 30px;
  padding: 20px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.48);
  box-shadow: 0 8px 22px rgba(70, 80, 110, 0.12);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}
.bi-upload__file {
  display: grid;
  place-items: center;
  min-height: 76px;
  padding: 16px;
  border: 2px dashed rgba(122, 166, 212, 0.58);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.48);
  color: #58728b;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.bi-upload__file input {
  width: min(100%, 330px);
  margin-top: 10px;
  color: #647084;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
}
.bi-upload__actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 14px;
}
.bi-upload__hint {
  color: #7a8aa0;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.65;
}
.bi-upload__save {
  flex: 0 0 auto;
  padding: 10px 17px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, #8fc7e8, #9fdcc5);
  color: #ffffff;
  box-shadow: 0 6px 16px rgba(80, 130, 150, 0.24);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s var(--spring), box-shadow 0.2s ease;
}
.bi-upload__save:hover {
  transform: translateY(-2px);
  box-shadow: 0 9px 20px rgba(80, 130, 150, 0.28);
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.post-item {
  list-style: none;
}
.post-item__link {
  position: relative;
  display: block;
  min-height: 176px;
  padding: 22px 58px 22px 24px;
  border-radius: 8px;
  color: inherit;
  text-decoration: none;
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.18s var(--spring);
}
.post-item__link:hover {
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 12px 28px rgba(70, 80, 110, 0.14);
  transform: translateY(-3px);
}
.post-item__date {
  display: block;
  margin-bottom: 8px;
  color: #8b98aa;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0;
}
.post-item h2 {
  color: #3f5a72;
  font-size: 21px;
  line-height: 1.35;
  font-weight: 600;
}
.post-item p {
  margin-top: 7px;
  color: #718096;
  font-size: 14px;
  line-height: 1.78;
}
.post-item__meta,
.post-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.post-item__meta {
  margin-top: 13px;
}
.post-item__meta span {
  color: #778497;
  font-size: 12px;
  font-weight: 650;
}
.post-item__tags {
  margin-top: 14px;
}
.post-item__tags span {
  padding: 6px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.68);
  color: #738198;
  font-size: 12px;
  font-weight: 650;
}
.post-item__arrow {
  position: absolute;
  top: 50%;
  right: 22px;
  width: 28px;
  height: 28px;
  margin-top: -14px;
  border-radius: 50%;
  color: #7a8aa0;
  font-size: 27px;
  line-height: 25px;
  text-align: center;
  transition: color 0.2s ease, transform 0.2s var(--spring), background 0.2s ease;
}
.post-item__link:hover .post-item__arrow {
  background: #ffffff;
  color: #e8895b;
  transform: translateX(4px);
}

.post-empty {
  margin-top: 24px;
  padding: 34px 16px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.5);
  color: #7a8aa0;
  text-align: center;
  font-size: 14px;
  font-weight: 650;
}

.bi-pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 34px;
}
.bi-pager__btn {
  padding: 9px 16px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  color: #647084;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 650;
}
.bi-pager__btn.is-disabled {
  opacity: 0.52;
  cursor: not-allowed;
}
.bi-pager__now {
  color: #7a8aa0;
  font-size: 13px;
  font-weight: 650;
}

.bi-side {
  position: sticky;
  top: 104px;
  align-self: start;
  min-width: 0;
}
.tag-panel,
.archive-panel {
  padding: 24px 22px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.42);
  box-shadow: 0 7px 20px rgba(70, 80, 110, 0.1);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}
.tag-panel {
  position: static;
}
.tag-panel__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}
.tag-panel__icon {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #ffffff;
  color: #e8895b;
  font-size: 20px;
  font-weight: 600;
  box-shadow: 0 3px 10px rgba(70, 80, 110, 0.12);
}
.tag-panel h2,
.archive-panel h2 {
  color: #3f5a72;
  font-size: 20px;
  font-weight: 600;
}
.tag-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 9px;
}
.tag-grid button {
  padding: 7px 11px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  color: #758196;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s var(--spring);
}
.tag-grid button:hover {
  transform: translateY(-2px);
  background: #ffffff;
}
.tag-grid button.is-active {
  background: #ffffff;
  color: #e8895b;
  box-shadow: 0 3px 10px rgba(70, 80, 110, 0.12);
}
.tag-panel__all {
  display: block;
  margin: 22px 0 0 auto;
  padding: 8px 14px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  color: #647084;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s var(--spring), background 0.2s ease;
}
.tag-panel__all:hover {
  transform: translateY(-2px);
  background: #ffffff;
}

.archive-panel {
  margin-top: 20px;
}
.archive-panel h2 {
  margin-bottom: 14px;
}
.archive-panel a {
  color: #647084;
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}
.archive-panel a:hover { color: #e8895b; }

@media (max-width: 940px) {
  .bi-shell {
    display: block;
    max-width: 760px;
    padding-top: 114px;
  }
  .bi-side {
    position: static;
    margin-top: 34px;
  }
  .bi-years { margin-left: 0; }
}

@media (max-width: 620px) {
  .bi-top {
    top: 12px; left: 12px; right: 12px;
    align-items: flex-start;
  }
  .bi-nav {
    max-width: 58vw;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .bi-nav::-webkit-scrollbar { display: none; }
  .bi-nav__link {
    flex: 0 0 auto;
    padding: 7px 11px;
    font-size: 12px;
  }
  .bi-back { padding: 8px 12px; font-size: 12px; }
  .bi-shell {
    padding: 96px 16px 74px;
  }
  .bi-head h1 { font-size: 32px; }
  .bi-toolbar { margin-bottom: 22px; }
  .bi-filter,
  .bi-years,
  .bi-upload-toggle {
    padding: 8px 12px;
    font-size: 12px;
  }
  .bi-upload {
    margin-top: -6px;
    padding: 16px;
  }
  .bi-upload__actions {
    align-items: stretch;
    flex-direction: column;
  }
  .bi-upload__save {
    width: 100%;
  }
  .post-list { gap: 14px; }
  .post-item__link {
    min-height: 0;
    padding: 19px 46px 19px 17px;
  }
  .post-item h2 { font-size: 18px; }
  .post-item p { font-size: 13px; }
  .post-item__arrow { right: 12px; }
  .tag-panel,
  .archive-panel {
    padding: 20px 16px;
  }
  .tag-grid {
    gap: 8px;
  }
  .tag-grid button {
    padding: 7px 10px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bi-cloud { animation: none; }
  .bi-back,
  .bi-nav__link,
    .bi-filter,
    .bi-years,
    .bi-upload-toggle,
    .bi-upload__save,
    .post-item__link,
  .post-item__arrow,
  .tag-grid button,
  .tag-panel__all { transition: none; }
}