/* ===== 设计令牌 ===== */
:root {
  --bg-deep: #0a0e17;
  --bg-card: rgba(15, 23, 42, 0.72);
  --bg-input: rgba(30, 41, 59, 0.6);
  --border: rgba(148, 163, 184, 0.12);
  --border-focus: rgba(56, 189, 248, 0.45);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --accent-glow: rgba(56, 189, 248, 0.25);
  --success: #34d399;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
  --header-h: 64px;
  --max-w: 1120px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== 背景装饰 ===== */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56, 189, 248, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(129, 140, 248, 0.12), transparent),
    radial-gradient(ellipse 50% 30% at 50% 100%, rgba(14, 165, 233, 0.08), transparent);
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
}

/* ===== 顶栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 14, 23, 0.82);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: 100%;
  max-width: var(--max-w);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 1.05rem;
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.logo-image {
  width: auto;
  max-width: 160px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav a:hover,
.nav a.is-active {
  color: var(--text);
  background: rgba(56, 189, 248, 0.08);
}

.nav a.is-active {
  color: var(--accent);
}

/* ===== 主内容 ===== */
main {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  margin-bottom: 20px;
}

.hero-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #f8fafc 0%, #7dd3fc 55%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.65;
  max-width: min(760px, 92vw);
  margin: 0 auto;
  padding: 0 8px;
}

/* ===== 布局：表单 + 预览 ===== */
.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title .step {
  width: 24px;
  height: 24px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-group:last-of-type {
  margin-bottom: 0;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.form-label .optional {
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 4px;
}

.form-hint-inline {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.45;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 14px;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-dim);
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: rgba(148, 163, 184, 0.22);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  min-height: 88px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.88rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 520px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* ===== 模式切换 ===== */
/* 仅开放账户状态时隐藏模式切换栏 */
.mode-tabs--account-only {
  display: none;
}

.mode-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  padding: 4px;
  background: rgba(30, 41, 59, 0.5);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.mode-tab {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.mode-tab:hover {
  color: var(--text);
}

.mode-tab.is-active {
  color: var(--text);
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

/* ===== 按钮 ===== */
.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.btn-primary.is-loading {
  pointer-events: none;
  opacity: 0.85;
}

.btn-spinner,
.generate-loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(15, 23, 42, 0.25);
  border-top-color: #0f172a;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

.generate-loading-spinner {
  width: 40px;
  height: 40px;
  border-width: 3px;
  border-color: rgba(56, 189, 248, 0.2);
  border-top-color: var(--accent);
  margin: 0 auto 16px;
}

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

/* ===== 生成中遮罩 ===== */
.card:has(#preview-empty) {
  position: relative;
}

.generate-loading {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 5;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: rgba(10, 14, 23, 0.88);
  backdrop-filter: blur(6px);
}

.generate-loading.is-active {
  display: flex;
}

.generate-loading-inner {
  text-align: center;
  padding: 24px;
}

.generate-loading-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.generate-loading-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.generate-countdown-num {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  font-weight: 700;
}

.generate-loading-progress {
  width: min(280px, 90vw);
  height: 4px;
  margin: 0 auto;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.15);
  overflow: hidden;
}

.generate-loading-progress-bar {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #38bdf8);
  transition: width 0.25s linear;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  flex: 1;
  color: #0f172a;
  background: linear-gradient(135deg, var(--accent), #0ea5e9);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px var(--accent-glow);
}

.btn-ghost {
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(148, 163, 184, 0.25);
  background: rgba(30, 41, 59, 0.4);
}

/* ===== 预览区 ===== */
.preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  text-align: center;
  color: var(--text-dim);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: rgba(30, 41, 59, 0.25);
}

.preview-empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  opacity: 0.4;
}

.preview-empty p,
.preview-simple-text {
  font-size: 0.9rem;
  max-width: 280px;
  line-height: 1.55;
  color: var(--text-muted);
}

/* 账户说明：内容自然撑开，不出现内侧滚动条 */
.preview-empty:has(.site-intro) {
  align-items: stretch;
  justify-content: flex-start;
  min-height: 0;
  padding: 4px 2px 12px;
  text-align: left;
}

.preview-empty:has(.site-intro) .preview-simple-text,
.preview-empty:has(.site-intro) p {
  max-width: none;
  width: 100%;
}

.preview-result {
  display: none;
}

.preview-result.is-visible {
  display: block;
  margin-bottom: 20px;
}

.result-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 420px;
  overflow-y: auto;
}

.result-list-empty {
  margin: 12px 0 0;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
  line-height: 1.5;
}

.history-item.is-active {
  border-color: rgba(56, 189, 248, 0.45);
  background: rgba(56, 189, 248, 0.08);
}

.result-current-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.result-table-head {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 0 10px 8px;
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: 600;
}

.result-table-head span:last-child {
  text-align: right;
  padding-right: 4px;
}

.result-item-current {
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.08);
}

.history-btn-copy {
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.3);
}

.history-btn-copy:hover {
  background: rgba(56, 189, 248, 0.15);
}

.history-btn-copy.copied {
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.35);
}

/* ===== 链接有效时间 ===== */
.duration-section-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: -4px 0 12px;
  line-height: 1.45;
}

.duration-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

@media (max-width: 520px) {
  .duration-options {
    grid-template-columns: 1fr;
  }
}

.duration-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(30, 41, 59, 0.5);
  cursor: pointer;
  font-family: var(--font);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.duration-option:hover {
  border-color: rgba(56, 189, 248, 0.35);
}

.duration-option.is-active {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.12);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.duration-option.is-popular:not(.is-active) {
  border-color: rgba(251, 191, 36, 0.35);
}

.duration-options.is-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  padding: 16px;
  border: 1px dashed rgba(148, 163, 184, 0.35);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.duration-options-empty {
  margin: 0;
  padding: 16px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.duration-option-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.duration-option-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.duration-option-price {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
}

/* 时长 · 会员价格对比面板 */
.duration-price-panel {
  margin-bottom: 12px;
  padding: 12px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid rgba(148, 163, 184, 0.14);
}

.duration-price-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.duration-price-panel__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.duration-price-panel__duration {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  padding: 2px 10px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.duration-member-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.12), rgba(56, 189, 248, 0.04));
  border: 1px solid rgba(56, 189, 248, 0.22);
}

.duration-member-status__badge {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(56, 189, 248, 0.2);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
}

.duration-member-status__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.duration-member-status__tier {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
}

.duration-member-status__charge {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.duration-member-status__price {
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.duration-member-status__price.is-free {
  color: var(--success);
}

.duration-member-status__unit {
  margin-left: 2px;
  font-weight: 500;
  color: var(--text-dim);
}

.duration-price-panel__guest {
  margin: 0 0 10px;
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.duration-tier-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 8px;
  width: 100%;
}

.duration-tier-grid > .duration-tier-card {
  flex: 1 1 0;
  min-width: 0;
}

.duration-tier-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
  padding: 10px 8px 8px;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.12);
  background: rgba(15, 23, 42, 0.5);
  transition: border-color var(--transition), box-shadow var(--transition), transform 0.15s ease;
}

.duration-tier-card__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  position: relative;
}

.duration-tier-avatar {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  background: rgba(148, 163, 184, 0.18);
  color: var(--text-muted);
}

.duration-tier-card__name {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.25;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.duration-tier-tag {
  position: absolute;
  top: -4px;
  right: -2px;
  font-size: 0.58rem;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 4px;
  line-height: 1.3;
}

.duration-tier-tag.is-current {
  background: var(--accent);
  color: #0f172a;
}

.duration-tier-tag.is-low {
  background: rgba(52, 211, 153, 0.2);
  color: var(--success);
}

.duration-tier-card__price {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.duration-tier-card__note {
  margin: 0;
  font-size: 0.6rem;
  color: var(--text-dim);
  line-height: 1.2;
}

/* 等级主题 */
.duration-tier-card.is-tier-base .duration-tier-avatar {
  background: rgba(148, 163, 184, 0.2);
  color: #94a3b8;
}

.duration-tier-card.is-tier-silver .duration-tier-avatar {
  background: rgba(148, 163, 184, 0.25);
  color: #e2e8f0;
}

.duration-tier-card.is-tier-gold .duration-tier-avatar {
  background: rgba(251, 191, 36, 0.2);
  color: #fcd34d;
}

.duration-tier-card.is-tier-diamond .duration-tier-avatar {
  background: rgba(167, 139, 250, 0.22);
  color: #ddd6fe;
}

.duration-tier-card.is-current {
  border-color: rgba(56, 189, 248, 0.45);
  background: rgba(56, 189, 248, 0.1);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.15);
}

.duration-tier-card.is-current .duration-tier-card__name {
  color: var(--text);
}

.duration-tier-card.is-current .duration-tier-card__price {
  color: var(--accent);
}

.duration-tier-card.is-current .duration-tier-avatar {
  background: rgba(56, 189, 248, 0.25);
  color: var(--accent);
}

.duration-tier-card.is-free .duration-tier-card__price {
  color: var(--success);
}

.duration-tier-card.is-lowest:not(.is-current) {
  border-color: rgba(52, 211, 153, 0.25);
}

.duration-tier-card:not(.is-tier-base):not(.is-tier-silver):not(.is-tier-gold):not(.is-tier-diamond)
  .duration-tier-avatar {
  background: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

.duration-price-hint {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.28);
  margin: 0 0 4px;
}

.duration-price-hint.is-free {
  color: #34d399;
  background: rgba(52, 211, 153, 0.1);
  border-color: rgba(52, 211, 153, 0.28);
}

/* ===== 生成结果行 ===== */
.history-item {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(30, 41, 59, 0.45);
  transition: border-color var(--transition), background var(--transition);
}

.history-no {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.history-remark {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
  word-break: break-all;
  min-width: 0;
}

.history-remark.is-empty {
  color: var(--text-dim);
  font-style: italic;
}

.history-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.history-item-actions button {
  padding: 5px 10px;
  font-size: 0.72rem;
  border-radius: 6px;
  font-family: var(--font);
  cursor: pointer;
  border: 1px solid var(--border);
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}

.history-btn-visit:hover {
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.1);
}

.history-btn-qr:hover {
  color: #c4b5fd;
  border-color: rgba(129, 140, 248, 0.35);
  background: rgba(129, 140, 248, 0.1);
}

.history-btn-del {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.25);
}

.history-btn-del:hover {
  background: rgba(248, 113, 113, 0.12);
}

/* 确认弹窗 */
.confirm-overlay {
  position: fixed;
  inset: 0;
  z-index: 340;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.confirm-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.confirm-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 350;
  width: calc(100% - 32px);
  max-width: 360px;
  transform: translate(-50%, -50%) scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.confirm-modal.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.confirm-modal-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px 20px;
  box-shadow: var(--shadow);
}

.confirm-modal-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.confirm-modal-message {
  margin: 0 0 20px;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-muted);
}

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

.confirm-modal-actions .btn {
  flex: 0 0 auto;
  min-width: 88px;
  padding: 10px 18px;
}

.btn-danger {
  color: #fff;
  background: linear-gradient(135deg, #ef4444, #dc2626);
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.35);
}

.btn-danger:hover {
  box-shadow: 0 6px 22px rgba(239, 68, 68, 0.45);
}

/* 二维码弹窗 */
.qr-overlay {
  position: fixed;
  inset: 0;
  z-index: 320;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.qr-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.qr-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  z-index: 330;
  width: calc(100% - 32px);
  max-width: 320px;
  transform: translate(-50%, -50%) scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.qr-modal.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.qr-modal-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.qr-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.qr-modal-header h3 {
  font-size: 1.05rem;
}

.qr-modal-remark {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.45;
}

.qr-image-wrap {
  display: flex;
  justify-content: center;
  padding: 12px;
  background: #fff;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.qr-image-wrap img {
  display: block;
}

.qr-modal-tip {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.preview-empty.is-hidden {
  display: none;
}

.result-block {
  margin-bottom: 20px;
}

.result-block:last-child {
  margin-bottom: 0;
}

.result-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-url {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.result-url input {
  flex: 1;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--accent);
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
}

.btn-copy {
  flex-shrink: 0;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: var(--text);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}

.btn-copy:hover {
  background: rgba(56, 189, 248, 0.22);
}

.btn-copy.copied {
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.1);
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.meta-tag {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 6px;
  color: var(--text-muted);
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border);
}

.meta-tag strong {
  color: var(--text);
  font-weight: 500;
}

/* ===== 特性条 ===== */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 48px;
}

@media (max-width: 1024px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .features {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }
}

.feature-item {
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.5);
  transition: border-color var(--transition);
}

.feature-item:hover {
  border-color: rgba(56, 189, 248, 0.2);
}

.feature-icon {
  margin-bottom: 10px;
  line-height: 0;
}

.feature-icon-img {
  display: block;
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 10px;
}

.feature-item h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-item p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== 页脚 · 友情链接 ===== */
.site-footer {
  position: relative;
  z-index: 1;
  padding: 20px 24px 28px;
  color: var(--text-dim);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 16px;
  max-width: min(960px, 92vw);
  margin: 0 auto;
}

.site-footer-label {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.site-footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 4px;
}

.site-footer-link {
  color: var(--text-dim);
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}

.site-footer-link:hover {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
}

@media (max-width: 640px) {
  .site-footer-inner {
    flex-direction: column;
    gap: 8px;
  }

  .site-footer-links {
    width: 100%;
  }
}

/* ===== 禁用状态 ===== */
.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled,
.mode-tab:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}