/* ===== 好友留言册 全局样式 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #080c18;
  --surface: #121a30;
  --surface-2: #0d1426;
  --border: rgba(255,255,255,0.08);
  --text: #e8eaf0;
  --text-dim: #8b92a8;
  --text-faint: #4a5168;
  --accent: #fbbf24;
  --accent-2: #4ecdc4;
  --accent-3: #ff6b9d;
  --danger: #ef4444;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  line-height: 1.6;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 40px;
  background: rgba(8, 12, 24, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 24px; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.25s;
}
.nav-links a:hover { color: var(--accent); }

/* ===== 主容器 ===== */
#view { max-width: 720px; margin: 0 auto; padding: 48px 20px 80px; }

.view-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.view-sub {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 36px;
}

/* ===== 卡片 ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 32px;
  margin-bottom: 20px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s;
  text-decoration: none;
  font-family: inherit;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #080c18;
}
.btn.primary:hover {
  box-shadow: 0 8px 30px -8px rgba(251, 191, 36, 0.5);
  color: #080c18;
}
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ===== 输入框 ===== */
.input {
  width: 100%;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.25s;
}
.input:focus { border-color: var(--accent); }
textarea.input {
  min-height: 160px;
  resize: vertical;
  line-height: 1.7;
}

/* ===== 上传区 ===== */
.upload-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.media-item {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid var(--border);
  aspect-ratio: 4/3;
}
.media-item img,
.media-item video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-item audio {
  width: 100%;
  height: 100%;
  padding: 10px;
  display: flex;
  align-items: center;
}
.media-item .remove-btn {
  position: absolute;
  top: 6px; right: 6px;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s;
}
.media-item:hover .remove-btn { opacity: 1; }
.media-item .remove-btn:hover { background: var(--danger); }

.upload-zone {
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
  margin-top: 14px;
}
.upload-zone:hover { border-color: var(--accent); background: rgba(251,191,36,0.04); }
.upload-zone.loading { opacity: 0.6; pointer-events: none; }

.section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  margin: 28px 0 4px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ===== 汇总卡片 ===== */
.summary-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  margin-bottom: 24px;
}
.summary-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.summary-name { font-size: 1.2rem; font-weight: 700; }
.summary-time { font-size: 0.75rem; color: var(--text-faint); }
.summary-content {
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  margin-bottom: 16px;
}
.summary-media { display: flex; flex-direction: column; gap: 10px; }
.summary-media img {
  max-width: 100%;
  border-radius: 12px;
  display: block;
}
.summary-media video {
  max-width: 100%;
  border-radius: 12px;
  display: block;
}
.summary-media audio { width: 100%; }
.empty-state {
  text-align: center;
  color: var(--text-faint);
  padding: 80px 20px;
}
.empty-state .big {
  font-size: 3rem;
  margin-bottom: 16px;
}

/* ===== 首页入口 ===== */
.home-hero { text-align: center; padding: 48px 0 32px; }
.home-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.home-hero p { color: var(--text-dim); font-size: 1rem; max-width: 460px; margin: 0 auto; }
.home-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translate(-50%, 20px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 24px;
  font-size: 0.9rem;
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
  z-index: 999;
  box-shadow: 0 12px 40px -12px rgba(0,0,0,0.6);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { border-color: var(--danger); color: #fca5a5; }

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .site-header { padding: 14px 20px; }
  #view { padding: 32px 16px 60px; }
  .card { padding: 22px; }
  .home-actions { flex-direction: column; }
  .home-actions .btn { width: 100%; }
}