// ============================================================
// DoubleC Studyverse — 首页 Dashboard 分栏（阶段 02）
// 深色透明背景 + 银色细边框 + 轻微 Blur + 低透明度
// Hover：边框增强 / 轻微发光 / 微小位移 / 光斑粒子响应
// ============================================================

/* ---------- 网格容器 ---------- */
.dc-dashboard {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: stretch;
}

/* ---------- 卡片基础 ---------- */
.dc-card {
  --mx: 50%;
  --my: 50%;
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 26px 28px;
  overflow: hidden;
  background: var(--dc-glass);
  border: 1px solid var(--dc-glass-border);
  border-radius: 16px;
  backdrop-filter: blur(14px) saturate(130%);
  -webkit-backdrop-filter: blur(14px) saturate(130%);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.32);
  transition: border-color .35s ease, transform .35s ease, box-shadow .35s ease;
}

/* 银色光斑：卡片 hover 时的「粒子响应」，跟随光标 */
.dc-card::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  background: radial-gradient(420px circle at var(--mx) var(--my), rgba(209, 213, 219, 0.09), transparent 62%);
  opacity: 0;
  transition: opacity .45s ease;
  pointer-events: none;
}

/* 卡片内容位于光斑之上 */
.dc-card > * {
  position: relative;
  z-index: 1;
}

.dc-card:hover {
  border-color: rgba(174, 180, 188, 0.34);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.46),
    0 0 0 1px rgba(209, 213, 219, 0.06),
    0 0 34px rgba(209, 213, 219, 0.10);
  transform: translateY(-3px);
}

.dc-card:hover::before {
  opacity: 1;
}

/* 每栏目的背景氛围（星点 / 光晕），位于内容之下 */
.dc-card::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  pointer-events: none;
}

.dc-card--about::after {
  background:
    radial-gradient(90% 70% at 18% 0%, rgba(184, 169, 198, 0.11), transparent 55%),
    radial-gradient(55% 50% at 100% 100%, rgba(200, 187, 175, 0.05), transparent 65%);
}

.dc-card--posts::after {
  background:
    radial-gradient(circle 1.5px at 16% 22%, rgba(255, 255, 255, 0.32), transparent 100%),
    radial-gradient(circle 1px at 32% 64%, rgba(255, 255, 255, 0.22), transparent 100%),
    radial-gradient(circle 1.5px at 72% 30%, rgba(255, 255, 255, 0.28), transparent 100%),
    radial-gradient(circle 1px at 86% 72%, rgba(255, 255, 255, 0.2), transparent 100%),
    radial-gradient(70% 55% at 50% 0%, rgba(140, 160, 200, 0.07), transparent 70%);
}

.dc-card--moments::after {
  background: radial-gradient(80% 70% at 82% 0%, rgba(200, 165, 130, 0.06), transparent 55%);
}

.dc-card--ailab::after {
  background: radial-gradient(90% 75% at 50% 0%, rgba(120, 140, 210, 0.08), transparent 62%);
}

.dc-card--friends::after {
  background:
    radial-gradient(circle 1.5px at 20% 30%, rgba(255, 255, 255, 0.28), transparent 100%),
    radial-gradient(circle 1px at 48% 70%, rgba(255, 255, 255, 0.2), transparent 100%),
    radial-gradient(circle 1.5px at 78% 24%, rgba(255, 255, 255, 0.26), transparent 100%),
    radial-gradient(70% 60% at 50% 100%, rgba(150, 160, 220, 0.07), transparent 70%);
}

.dc-card--guestbook::after {
  background: radial-gradient(60% 50% at 90% 100%, rgba(209, 213, 219, 0.05), transparent 60%);
}

/* ---------- 卡片头部 ---------- */
.dc-card-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--dc-line);
}

.dc-card-index {
  font-family: var(--dc-mono);
  font-size: 12px;
  color: var(--dc-ink-4);
  letter-spacing: 0.08em;
}

.dc-card-title {
  margin: 0;
  font-family: var(--dc-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--dc-ink-0);
}

.dc-card--about .dc-card-index,
.dc-card--ailab .dc-card-index {
  color: var(--dc-accent);
}

/* ---------- 卡片底部 ---------- */
.dc-card-foot {
  margin-top: auto;
  padding-top: 16px;
  display: flex;
  align-items: center;
}

.dc-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--dc-ink-3);
  transition: color .25s ease, gap .25s ease;
}

.dc-more:hover {
  color: #fff;
  gap: 12px;
}

.dc-note {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--dc-ink-4);
}

/* ---------- ABOUT ---------- */
.dc-about-hero {
  display: flex;
  align-items: center;
  gap: 16px;
}

.dc-about-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--dc-glass-border);
  filter: drop-shadow(0 0 12px rgba(209, 213, 219, 0.18));
}

.dc-about-name {
  font-family: var(--dc-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--dc-ink-0);
}

.dc-about-alias {
  margin-top: 2px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--dc-accent);
}

.dc-about-desc {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--dc-ink-2);
}

.dc-about-now {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 14px;
  padding: 9px 13px;
  border: 1px solid var(--dc-line);
  border-radius: 10px;
  background: rgba(209, 213, 219, 0.03);
}

.dc-now-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dc-accent);
  box-shadow: 0 0 10px rgba(184, 169, 198, 0.6);
}

.dc-now-text {
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--dc-ink-3);
}

.dc-about-kw {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.dc-kw {
  padding: 5px 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dc-ink-2);
  border: 1px solid rgba(184, 169, 198, 0.22);
  border-radius: 999px;
  background: rgba(184, 169, 198, 0.06);
}

/* ---------- LATEST POSTS ---------- */
.dc-posts {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dc-post {
  display: flex;
  gap: 14px;
  padding: 12px 8px;
  margin: 0 -8px;
  border-radius: 12px;
  transition: background .3s ease;
}

.dc-post:hover {
  background: rgba(209, 213, 219, 0.04);
}

.dc-post-cover {
  flex: 0 0 auto;
  width: 60px;
  height: 60px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--dc-glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.dc-cover-color {
  width: 100%;
  height: 100%;
}

.dc-cover-fallback {
  font-family: var(--dc-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--dc-ink-3);
}

.dc-post-info {
  flex: 1 1 auto;
  min-width: 0;
}

.dc-post-title {
  font-family: var(--dc-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--dc-ink-0);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}

.dc-post-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  font-size: 12px;
  color: var(--dc-ink-4);
}

.dc-post-cat {
  padding: 1px 8px;
  border: 1px solid var(--dc-line);
  border-radius: 999px;
  color: var(--dc-ink-3);
}

.dc-post-summary {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--dc-ink-3);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ---------- MOMENTS ---------- */
.dc-moments {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dc-moment {
  display: flex;
  gap: 12px;
}

.dc-moment-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-radius: 50%;
  background: #D1D5DB;
  box-shadow: 0 0 10px rgba(209, 213, 219, 0.55);
}

.dc-moment-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--dc-ink-2);
}

.dc-moment-time {
  display: block;
  margin-top: 3px;
  font-family: var(--dc-mono);
  font-size: 11px;
  color: var(--dc-ink-4);
}

.dc-moment-img {
  display: block;
  max-width: 100%;
  margin-top: 8px;
  border-radius: 10px;
  border: 1px solid var(--dc-glass-border);
}

/* ---------- AI LAB ---------- */
.dc-ailab {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dc-project {
  display: flex;
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--dc-line);
  border-radius: 12px;
  background: rgba(209, 213, 219, 0.03);
  transition: border-color .3s ease, background .3s ease, transform .3s ease;
}

.dc-project:hover {
  border-color: rgba(174, 180, 188, 0.32);
  background: rgba(209, 213, 219, 0.06);
  transform: translateX(3px);
}

.dc-project-cover {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--dc-glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.dc-project-fallback {
  font-family: var(--dc-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--dc-ink-3);
}

.dc-project-info {
  flex: 1 1 auto;
  min-width: 0;
}

.dc-project-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dc-project-title {
  font-family: var(--dc-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--dc-ink-0);
}

.dc-project-status {
  padding: 2px 9px;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--dc-ink-2);
  border: 1px solid var(--dc-glass-border);
  border-radius: 999px;
}

.dc-project-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.dc-project-tool {
  font-family: var(--dc-mono);
  font-size: 11px;
  color: var(--dc-ink-4);
  padding: 1px 7px;
  border: 1px solid var(--dc-line);
  border-radius: 999px;
}

.dc-project-desc {
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--dc-ink-3);
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ---------- FRIENDS — 小型星系 ---------- */
.dc-friends-galaxy {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px 26px;
  padding: 8px 0;
}

.dc-friend-star {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  transition: transform .3s ease;
}

.dc-friend-star:hover {
  transform: translateY(-3px);
}

.dc-friend-star-core {
  position: relative;
  width: 52px;
  height: 52px;
}

.dc-friend-star-core::after {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(209, 213, 219, 0.22), transparent 70%);
  filter: blur(3px);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
}

.dc-friend-star:hover .dc-friend-star-core::after {
  transform: scale(1.12);
}

.dc-friend-star-core img {
  position: relative;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--dc-glass-border);
  object-fit: cover;
  transition: box-shadow .3s ease;
}

.dc-friend-star:hover .dc-friend-star-core img {
  box-shadow: 0 0 18px rgba(209, 213, 219, 0.35);
}

.dc-friend-star-name {
  font-size: 12px;
  color: var(--dc-ink-3);
  transition: color .3s ease;
}

.dc-friends-invite {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  width: 100%;
  min-height: 112px;
  text-align: left;
}

.dc-friends-invite-mark {
  color: var(--dc-accent);
  font-size: 34px;
  text-shadow: 0 0 24px rgba(184, 169, 198, 0.42);
}

.dc-friends-invite strong {
  color: var(--dc-ink-1);
  font-family: var(--dc-serif);
  font-size: 16px;
}

.dc-friends-invite p {
  margin: 5px 0 0;
  color: var(--dc-ink-4);
  font-size: 13px;
}

.dc-friend-star:hover .dc-friend-star-name {
  color: #fff;
}

/* ---------- GUESTBOOK ---------- */
.dc-guestbook {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dc-guest {
  padding: 12px 16px;
  border: 1px solid var(--dc-line);
  border-radius: 12px;
  background: rgba(209, 213, 219, 0.03);
}

.dc-guest-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.dc-guest-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--dc-ink-0);
}

.dc-guest-time {
  font-family: var(--dc-mono);
  font-size: 11px;
  color: var(--dc-ink-4);
}

.dc-guest-text {
  font-size: 13px;
  line-height: 1.65;
  color: var(--dc-ink-2);
}

/* ---------- 空状态 ---------- */
.dc-empty {
  font-size: 13px;
  color: var(--dc-ink-4);
  letter-spacing: 0.04em;
}

/* ---------- 通栏卡片（FRIENDS / GUESTBOOK） ---------- */
.dc-card--friends,
.dc-card--guestbook {
  grid-column: 1 / -1;
}

/* ---------- 响应式：移动端单栏 ---------- */
@media screen and (max-width: 900px) {
  .dc-dashboard {
    grid-template-columns: 1fr;
  }

  .dc-card--friends,
  .dc-card--guestbook {
    grid-column: auto;
  }

  /* 移动端顺序：ABOUT → PROJECTS → POSTS → MOMENTS → FRIENDS */
  .dc-card--about { order: 1; }
  .dc-card--ailab { order: 2; }
  .dc-card--posts { order: 3; }
  .dc-card--moments { order: 4; }
  .dc-card--friends { order: 5; }
}

@media screen and (max-width: 768px) {
  .dc-card {
    padding: 22px 18px;
    border-radius: 12px;
  }

  .dc-friends-invite {
    align-items: flex-start;
    min-height: auto;
    padding: 10px 0;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .dc-card,
  .dc-card::before,
  .dc-post,
  .dc-project,
  .dc-friend-star {
    transition: none !important;
  }

  .dc-card:hover,
  .dc-friend-star:hover {
    transform: none;
  }
}