/* ========== 主题变量 ========== */
:root {
  --bg: #f2f4f9;
  --card: #ffffff;
  --card-hover: #f6f8fc;
  --text: #1c2333;
  --text-2: #5b6478;
  --text-3: #9aa3b8;
  --border: #e3e8f0;
  --primary: #4f7cff;
  --primary-hover: #3d6bf5;
  --primary-soft: rgba(79, 124, 255, 0.1);
  --danger: #f0455a;
  --danger-soft: rgba(240, 69, 90, 0.1);
  --ok: #21a35d;
  --shadow: 0 1px 2px rgba(23, 35, 71, 0.05), 0 4px 16px rgba(23, 35, 71, 0.06);
  --shadow-lg: 0 8px 32px rgba(23, 35, 71, 0.16);
  --topbar: rgba(255, 255, 255, 0.82);
  --radius: 14px;
}

html.dark {
  --bg: #10131b;
  --card: #1a1f2c;
  --card-hover: #202636;
  --text: #e7eaf2;
  --text-2: #a4adc2;
  --text-3: #5f6a82;
  --border: #262d3d;
  --primary: #5c86ff;
  --primary-hover: #6f93ff;
  --primary-soft: rgba(92, 134, 255, 0.14);
  --danger: #ff5d70;
  --danger-soft: rgba(255, 93, 112, 0.14);
  --ok: #37c47c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --topbar: rgba(16, 19, 27, 0.82);
}

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

[hidden] { display: none !important; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(900px 500px at 85% -10%, var(--primary-soft), transparent 60%),
    var(--bg);
  color: var(--text);
  font-size: 14px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
}

svg { width: 100%; height: 100%; }
button { font-family: inherit; }

/* ========== 顶栏 ========== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 22px;
  background: var(--topbar);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logo svg {
  width: 26px;
  height: 26px;
  color: var(--primary);
  flex: none;
  filter: drop-shadow(0 2px 6px var(--primary-soft));
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  flex: none;
}

.icon-btn:hover { background: var(--bg, #e9edf5); color: var(--text); }
html.dark .icon-btn:hover { background: #202636; }
.icon-btn svg { width: 17px; height: 17px; }

#themeBtn { border: 1px solid var(--border); background: var(--card); }

.auth-btn {
  height: 36px;
  padding: 0 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text-2);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.auth-btn:hover { color: var(--text); border-color: var(--primary); }

.admin-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 13px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.admin-badge svg { width: 15px; height: 15px; }

.admin-badge .logout {
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-size: 12px;
  opacity: 0.75;
  padding: 2px 4px;
  font-family: inherit;
}

.admin-badge .logout:hover { opacity: 1; text-decoration: underline; }

/* ========== 主体 ========== */
main {
  flex: 1;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 22px 90px;
}

.notice {
  background: var(--primary-soft);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 20px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ========== 链接卡片 ========== */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 14px;
}

.link-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  animation: cardIn 0.28s ease both;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.link-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: 0 4px 20px var(--primary-soft);
}

.link-card .card-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.link-card .card-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

.link-card .card-icon svg { width: 20px; height: 20px; }

.link-card .card-title {
  font-size: 15px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.link-card .card-desc {
  font-size: 12.5px;
  color: var(--text-2);
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-y: auto;
  max-height: 120px;
  min-height: 0;
  overscroll-behavior: contain;
}

.link-card .card-desc::-webkit-scrollbar { width: 4px; }
.link-card .card-desc::-webkit-scrollbar-thumb { background: var(--text-3); border-radius: 2px; }

.link-card .card-bottom {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 4px;
}

.link-card .card-host {
  font-size: 11.5px;
  color: var(--text-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.link-card .card-clicks {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  flex: none;
  font-size: 11.5px;
  color: var(--text-3);
  font-variant-numeric: tabular-nums;
  transition: color 0.15s;
}

.link-card .card-clicks svg { width: 12px; height: 12px; flex: none; display: block; }
.link-card:hover .card-clicks { color: var(--primary); }

/* 卡片管理按钮（编辑模式） */
.card-admin {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 4px;
}

.card-admin .icon-btn {
  width: 28px;
  height: 28px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.card-admin .icon-btn svg { width: 14px; height: 14px; }
.card-admin .icon-btn.danger:hover { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.card-admin .icon-btn.move:hover { color: var(--primary); border-color: var(--primary); }

/* ========== 空状态 / 加载 ========== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 90px 20px;
  color: var(--text-3);
}

.empty-state svg { width: 64px; height: 64px; opacity: 0.5; }
.empty-state p { font-size: 14px; }
.empty-state .empty-sub { font-size: 12.5px; }

.spinner {
  width: 30px;
  height: 30px;
  border: 3px solid var(--primary-soft);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.page-footer {
  text-align: center;
  padding: 30px 0 20px;
  color: var(--text-3);
  font-size: 12px;
}

/* ========== 管理员工具条 ========== */
.admin-bar {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  gap: 10px;
  padding: 10px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  animation: barIn 0.25s ease;
}

@keyframes barIn {
  from { opacity: 0; transform: translateX(-50%) translateY(12px); }
  to { opacity: 1; transform: translateX(-50%); }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 16px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn svg { width: 16px; height: 16px; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 10px var(--primary-soft);
}

.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }

.btn-ghost {
  background: var(--card);
  color: var(--text-2);
  border-color: var(--border);
}

.btn-ghost:hover { color: var(--text); border-color: var(--primary); }

.btn-done {
  background: var(--ok);
  color: #fff;
}

.btn-done:hover { filter: brightness(1.08); transform: translateY(-1px); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(1.08); }

/* ========== 弹窗 ========== */
.modal-mask {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 19, 31, 0.45);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.18s ease;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
  width: 100%;
  max-width: 400px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 24px;
  animation: modalIn 0.22s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.94) translateY(8px); }
  to { opacity: 1; transform: none; }
}

.modal h3 {
  font-size: 16.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 9px;
}

.modal h3 svg { width: 19px; height: 19px; color: var(--primary); flex: none; }
.modal.danger h3 svg { color: var(--danger); }

.modal .desc { font-size: 13px; color: var(--text-2); line-height: 1.6; margin-bottom: 16px; word-break: break-all; }

.modal label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-2);
  margin: 12px 0 6px;
}

.modal input, .modal textarea {
  width: 100%;
  padding: 0 13px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
}

.modal textarea {
  height: auto;
  min-height: 80px;
  padding: 10px 13px;
  resize: vertical;
  line-height: 1.6;
}

.modal input:focus, .modal textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.modal .modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
}

.modal .btn { height: 36px; padding: 0 18px; font-size: 13px; }
.modal .btn-cancel { background: transparent; color: var(--text-2); }
.modal .btn-cancel:hover { background: var(--bg, #e9edf5); color: var(--text); }
html.dark .modal .btn-cancel:hover { background: #202636; }

.modal .form-error {
  color: var(--danger);
  font-size: 12.5px;
  margin-top: 10px;
  min-height: 16px;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 13px;
  color: #fff;
  background: rgba(28, 35, 51, 0.92);
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.25s ease;
  max-width: calc(100vw - 40px);
}

html.dark .toast { background: rgba(50, 58, 80, 0.95); }

.toast.ok::before, .toast.err::before {
  content: '';
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: 1px;
}

.toast.ok::before { background: var(--ok); }
.toast.err::before { background: var(--danger); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to { opacity: 1; transform: translateX(-50%); }
}

/* ========== 留言板 ========== */
.msg-section { margin-top: 34px; }

.msg-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  margin-bottom: 4px;
}

.msg-title svg { width: 18px; height: 18px; color: var(--primary); flex: none; }

.msg-count { font-size: 12px; color: var(--text-3); font-weight: 400; }

.msg-tip { font-size: 12px; color: var(--text-3); margin-bottom: 14px; }

.msg-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}

.msg-form input {
  height: 38px;
  padding: 0 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  outline: none;
  font-family: inherit;
}

.msg-form textarea {
  min-height: 90px;
  padding: 10px 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font-size: 13.5px;
  line-height: 1.6;
  outline: none;
  resize: vertical;
  font-family: inherit;
}

.msg-form input:focus, .msg-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.msg-form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.msg-counter { font-size: 12px; color: var(--text-3); }

.msg-list { display: flex; flex-direction: column; gap: 10px; }

.msg-item {
  position: relative;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  animation: cardIn 0.25s ease both;
}

.msg-item .msg-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.msg-item .msg-nick {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

.msg-item .msg-time { font-size: 11.5px; color: var(--text-3); }

.msg-item .msg-ip {
  font-size: 11px;
  color: var(--text-3);
  background: var(--danger-soft);
  color: var(--danger);
  padding: 1px 7px;
  border-radius: 6px;
  font-family: monospace;
}

.msg-item .msg-body {
  font-size: 13.5px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

/* 置顶样式 */
.msg-item.pinned {
  border-color: var(--primary);
  background: linear-gradient(135deg, var(--primary-soft), var(--card) 55%);
}

.msg-pin-tag {
  font-size: 10.5px;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  padding: 1px 8px;
  border-radius: 6px;
  letter-spacing: 1px;
}

/* 管理按钮组（底部） */
.msg-admin-btns {
  display: none;
  gap: 6px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  justify-content: flex-end;
}

.msg-item.admin-mode .msg-admin-btns { display: flex; }

.msg-act {
  width: 30px;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.msg-act svg { width: 14px; height: 14px; }
.msg-act:hover { border-color: var(--primary); color: var(--primary); }
.msg-act.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.msg-act.danger:hover { border-color: var(--danger); color: var(--danger); background: var(--danger-soft); }

.msg-empty {
  text-align: center;
  padding: 30px;
  color: var(--text-3);
  font-size: 13px;
}

/* ========== 响应式 ========== */
@media (max-width: 640px) {
  .topbar { padding: 10px 14px; gap: 10px; }
  main { padding: 16px 14px 100px; }
  .link-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .link-card { padding: 14px; }
  .link-card .card-title { font-size: 13.5px; }
  .admin-bar { bottom: 14px; padding: 8px 10px; gap: 8px; }
  .btn { height: 36px; padding: 0 13px; font-size: 13px; }
}

@media (max-width: 420px) {
  .link-grid { grid-template-columns: 1fr; }
}