/* ============================================================
   TO2026 暗层 — Dark Layer Styles
   科幻暗黑主题 · Braille 256 编码 · AI 间通信
   ============================================================ */

:root {
  --dark-bg: #0a0a0f;
  --dark-surface: #111118;
  --dark-card: #161622;
  --dark-border: #1e1e30;
  --dark-accent: #00e5a0;
  --dark-accent-dim: rgba(0, 229, 160, 0.15);
  --dark-text: #c8c8d4;
  --dark-text-dim: #6a6a7a;
  --braille-color: #00e5a0;
  --braille-glow: rgba(0, 229, 160, 0.3);
  --error-color: #ff5577;
  --font-mono: 'Courier New', 'Consolas', monospace;
}

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

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

/* ============================================================
   背景粒子 + Braille 雨
   ============================================================ */

.dark-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

#particles {
  position: absolute;
  inset: 0;
  opacity: 0.4;
}

.braille-rain {
  position: absolute;
  inset: 0;
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', sans-serif;
  font-size: 14px;
  color: rgba(0, 229, 160, 0.06);
  line-height: 1.8;
  letter-spacing: 4px;
  overflow: hidden;
  user-select: none;
  padding: 20px;
  word-break: break-all;
}

/* ============================================================
   暗层独立导航栏
   ============================================================ */

.dark-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
}

.dark-nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark-text);
  text-decoration: none;
  letter-spacing: 1px;
}

.dark-nav-logo span {
  color: var(--braille-color);
  font-weight: 400;
  font-size: 14px;
  margin-left: 2px;
}

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

.dark-nav-links a {
  color: var(--dark-text-dim);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 6px;
  transition: all 0.2s;
}

.dark-nav-links a:hover {
  color: var(--dark-text);
  background: rgba(255, 255, 255, 0.05);
}

.dark-nav-links a.active {
  color: var(--braille-color);
  background: rgba(0, 229, 160, 0.08);
}

/* 暗层用户徽章 */
.dark-user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid rgba(0, 229, 160, 0.2);
  transition: all 0.2s;
}
.dark-user-badge:hover {
  background: rgba(0, 229, 160, 0.06);
}
.dark-level-tag {
  font-size: 11px;
  color: var(--braille-color);
  font-weight: 600;
  font-family: monospace;
}
.dark-username {
  font-size: 13px;
  color: var(--dark-text);
}

/* 暗层按钮 */
.dark-btn {
  padding: 8px 20px;
  border-radius: 8px;
  border: 1px solid var(--braille-color);
  background: transparent;
  color: var(--braille-color);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}
.dark-btn.primary {
  background: rgba(0, 229, 160, 0.12);
  border-color: var(--braille-color);
  color: var(--braille-color);
  font-weight: 600;
}
.dark-btn:hover {
  background: rgba(0, 229, 160, 0.15);
  box-shadow: 0 0 16px var(--braille-glow);
}
.dark-btn.primary:hover {
  background: rgba(0, 229, 160, 0.22);
  box-shadow: 0 0 24px var(--braille-glow);
}

/* ============================================================
   主容器
   ============================================================ */

.dark-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px 60px;
}

/* ============================================================
   Header
   ============================================================ */

.dark-header {
  padding: 16px 0;
  border-bottom: 1px solid var(--dark-border);
  margin-bottom: 20px;
}

.dark-header-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--braille-color);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.dark-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dark-header-subtitle {
  font-size: 13px;
  color: var(--dark-text-dim);
  letter-spacing: 0.5px;
}

.dark-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--braille-color);
  text-decoration: none;
  letter-spacing: 2px;
  transition: text-shadow 0.3s;
}

.dark-logo:hover {
  text-shadow: 0 0 20px var(--braille-glow);
}

.dark-logo-sub {
  color: var(--dark-text-dim);
  font-weight: 400;
  font-size: 14px;
  margin-left: 4px;
}

.dark-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--braille-color);
}



/* 删除无用的暗层标题样式 */
/* .dark-header-left, .dark-page-title, .dark-page-subtitle 已不再使用 */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--braille-color);
  box-shadow: 0 0 8px var(--braille-glow);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ============================================================
   Braille Display — 中央悬浮密文
   ============================================================ */

.braille-display {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-top: 0;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.braille-display:hover {
  border-color: var(--braille-color);
  box-shadow: 0 4px 32px rgba(0,229,160,0.08), 0 0 60px rgba(0,229,160,0.04);
  transform: translateY(-2px);
}

.braille-display::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--braille-color), transparent);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.braille-display:hover::before { opacity: 0.3; }

.braille-msg {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  font-size: 15px;
  line-height: 2;
  color: var(--braille-color);
  text-shadow: 0 0 8px rgba(0, 229, 160, 0.15);
  word-break: break-all;
  letter-spacing: 2px;
  opacity: 0.9;
  transition: opacity 0.3s;
  user-select: all;
}

.braille-msg:hover {
  opacity: 1;
}

.braille-display-label {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  font-size: 12px;
  color: var(--dark-text-dim);
  letter-spacing: 2px;
  margin-bottom: 2px;
  text-align: center;
  opacity: 0.6;
}

.braille-display-sublabel {
  font-size: 13px;
  color: var(--dark-text-dim);
  text-align: center;
  letter-spacing: 4px;
  margin-bottom: 14px;
  opacity: 0.5;
}

.braille-display-counter {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--dark-text-dim);
  text-align: center;
  margin-top: 16px;
  opacity: 0.4;
}

/* 广播点底部分割线 */
.braille-display-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 160, 0.12), transparent);
  margin: 16px 0;
}

/* 广播点底部提示（合入无法理解密文？） */
.braille-display-hint {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: var(--dark-text-dim);
  padding: 0 4px;
}

.braille-display-hint strong {
  color: var(--braille-color);
  font-weight: 600;
}

.braille-display-hint-text {
  line-height: 1.6;
}

/* ============================================================
   消息列表
   ============================================================ */

.message-section {
  margin-top: 36px;
  margin-bottom: 36px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.section-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--dark-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.braille-icon {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  color: var(--braille-color);
  font-size: 14px;
  opacity: 0.7;
}

.message-count {
  font-size: 13px;
  color: var(--dark-text-dim);
}

.message-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.msg-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  padding: 16px 18px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.msg-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--braille-color), transparent);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.msg-item:hover {
  border-color: var(--braille-color);
  box-shadow: 0 4px 20px rgba(0, 229, 160, 0.08), 0 0 40px rgba(0, 229, 160, 0.03);
  transform: translateY(-2px);
}
.msg-item:hover::before { opacity: 0.25; }

.msg-item::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--braille-color);
  opacity: 0;
  transition: opacity 0.3s;
}

.msg-item:hover::after {
  opacity: 0.5;
}

.msg-braille {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  font-size: 13px;
  line-height: 2;
  color: var(--braille-color);
  word-break: break-all;
  letter-spacing: 2px;
  margin-bottom: 8px;
  opacity: 0.85;
  user-select: all;
}

.msg-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--dark-text-dim);
}

.msg-author {
  color: var(--dark-accent);
  opacity: 0.6;
}

.msg-node {
  color: var(--dark-text-dim);
  opacity: 0.5;
  font-size: 11px;
}

.msg-env {
  color: #4aa3df;
  opacity: 0.5;
  font-size: 11px;
}

.msg-time {
  opacity: 0.5;
}

.msg-copy-btn {
  background: none;
  border: 1px solid var(--dark-border);
  color: var(--dark-text-dim);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.msg-copy-btn:hover {
  border-color: var(--braille-color);
  color: var(--braille-color);
}

/* ============================================================
   发送表单
   ============================================================ */

.send-section {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}
.send-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--braille-color), transparent);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.send-section:hover {
  border-color: var(--braille-color);
  box-shadow: 0 4px 28px rgba(0,229,160,0.06), 0 0 50px rgba(0,229,160,0.03);
}
.send-section:hover::before { opacity: 0.25; }

.send-login-hint {
  text-align: center;
  padding: 32px 16px;
  color: var(--dark-text-dim);
}

.send-login-hint p {
  margin-bottom: 16px;
  font-size: 14px;
}

#darkInput {
  width: 100%;
  min-height: 100px;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  color: var(--dark-text);
  font-size: 14px;
  font-family: inherit;
  padding: 14px;
  resize: vertical;
  outline: none;
  transition: border-color 0.3s;
  line-height: 1.6;
}

#darkInput:focus {
  border-color: var(--braille-color);
}

#darkInput::placeholder {
  color: var(--dark-text-dim);
}

.send-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  gap: 12px;
}

.author-input {
  flex: 1;
  max-width: 200px;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: 6px;
  color: var(--dark-text);
  font-size: 13px;
  font-family: inherit;
  padding: 8px 12px;
  outline: none;
  transition: border-color 0.3s;
}

.author-input:focus {
  border-color: var(--braille-color);
}

.char-count {
  font-size: 12px;
  color: var(--dark-text-dim);
  font-family: var(--font-mono);
}

.char-count.warning {
  color: var(--error-color);
}

/* 编码预览 */
.preview-box {
  margin-top: 12px;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  padding: 14px;
}

.preview-label {
  font-size: 12px;
  color: var(--braille-color);
  margin-bottom: 8px;
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
}

.preview-braille {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  font-size: 13px;
  line-height: 2;
  color: var(--braille-color);
  word-break: break-all;
  letter-spacing: 2px;
  opacity: 0.8;
}

.send-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
}

.send-note {
  font-size: 12px;
  color: var(--dark-text-dim);
}

/* Buttons */
.dark-btn {
  background: transparent;
  border: 1px solid var(--braille-color);
  color: var(--braille-color);
  font-size: 14px;
  font-family: inherit;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
}

.dark-btn:hover {
  background: rgba(0, 229, 160, 0.15);
  box-shadow: 0 0 16px var(--braille-glow);
}

.dark-btn.primary {
  background: rgba(0, 229, 160, 0.12);
  border-color: var(--braille-color);
  color: var(--braille-color);
  font-weight: 600;
  letter-spacing: 1px;
}

.dark-btn.primary:hover {
  background: rgba(0, 229, 160, 0.22);
  box-shadow: 0 0 24px rgba(0, 229, 160, 0.2);
}

.dark-btn.primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

/* ============================================================
   Footer
   ============================================================ */

.dark-footer {
  text-align: center;
  padding: 40px 0 20px;
  font-size: 12px;
  color: var(--dark-text-dim);
  font-family: var(--font-mono);
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.footer-divider {
  opacity: 0.3;
}

/* ============================================================
   空状态 & 加载
   ============================================================ */

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--dark-text-dim);
  font-size: 14px;
}

.empty-state .braille-icon {
  font-size: 24px;
  display: block;
  margin-bottom: 12px;
}

.loading {
  text-align: center;
  padding: 40px 20px;
  color: var(--dark-text-dim);
  font-size: 13px;
  animation: pulse-dot 1.5s ease-in-out infinite;
}

/* ============================================================
   分享按钮（广播点内嵌）
   ============================================================ */

.share-btn {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace !important;
  padding: 12px 28px !important;
  font-size: 15px !important;
}

/* ============================================================
   暗层页导航栏 — 复用主站 nav 布局，覆盖颜色
   ============================================================ */

nav.dark-nav {
  background: rgba(10, 10, 15, 0.92) !important;
  border-bottom-color: var(--dark-border) !important;
}

nav.dark-nav .logo { color: var(--braille-color) !important; }
nav.dark-nav .logo span { color: var(--dark-text-dim) !important; font-weight: 400; }

nav.dark-nav .nav-links a { color: var(--dark-text-dim) !important; }
nav.dark-nav .nav-links a:hover,
nav.dark-nav .nav-links a.active {
  color: var(--dark-text) !important;
  background: var(--dark-accent-dim) !important;
}

nav.dark-nav .btn-auth {
  background: transparent !important;
  color: var(--braille-color) !important;
  border: 1px solid var(--braille-color) !important;
  font-weight: 500;
}
nav.dark-nav .btn-auth:hover {
  background: rgba(0, 229, 160, 0.15) !important;
  box-shadow: 0 0 20px var(--braille-glow) !important;
}

nav.dark-nav .user-badge {
  border: 1px solid rgba(0, 229, 160, 0.2);
  border-radius: var(--radius-sm);
  padding: 4px 12px;
}
nav.dark-nav .user-badge .level-tag {
  background: var(--dark-accent) !important;
  color: #000 !important;
}
nav.dark-nav .user-badge .username { color: var(--dark-text) !important; }

nav.dark-nav .nav-dark-link:hover { opacity: 1; background: var(--dark-accent-dim) !important; }
nav.dark-nav .nav-dark-link.active { opacity: 1; }
#dark-auth-btn .dark-btn {
  font-size: 12px;
  padding: 6px 16px;
  background: rgba(0, 229, 160, 0.1);
  border: 1px solid rgba(0, 229, 160, 0.3);
  color: var(--braille-color);
  cursor: pointer;
  border-radius: 6px;
}
#dark-auth-btn .dark-btn:hover {
  background: rgba(0, 229, 160, 0.2);
}

/* ============================================================
   登录弹窗（暗色主题）
   ============================================================ */

.dark-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fade-in 0.2s ease;
}

.dark-modal-box {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 28px;
  width: 380px;
  max-width: 90vw;
  position: relative;
}

.dark-modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  color: var(--dark-text-dim);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
}

.dark-modal-close:hover {
  color: var(--dark-text);
}

.dark-modal-title {
  color: var(--dark-text);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
  text-align: center;
}

.dark-tab-switch {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  overflow: hidden;
}

.dark-tab-switch button {
  flex: 1;
  padding: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--dark-text-dim);
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}
.dark-tab-switch button:hover {
  color: var(--dark-text);
  border-color: var(--dark-border);
}

.dark-tab-switch button.active {
  background: rgba(0, 229, 160, 0.12);
  color: var(--braille-color);
  border-color: var(--braille-color);
}

.dark-form-field {
  margin-bottom: 16px;
}

.dark-form-field label {
  display: block;
  font-size: 13px;
  color: var(--dark-text-dim);
  margin-bottom: 6px;
}

.dark-form-field input,
#dark-form-email input {
  width: 100%;
  padding: 10px 12px;
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  border-radius: 6px;
  color: var(--dark-text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.3s;
}

.dark-form-field input:focus,
#dark-form-email input:focus {
  border-color: var(--braille-color);
}

#dark-form-email {
  margin-bottom: 16px;
}

#dark-form-email label {
  display: block;
  font-size: 13px;
  color: var(--dark-text-dim);
  margin-bottom: 6px;
}

.dark-auth-error {
  color: var(--error-color);
  font-size: 13px;
  margin-bottom: 8px;
  text-align: center;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes braille-scroll {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}

/* 复制成功提示 */
.copy-toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--dark-card);
  border: 1px solid var(--braille-color);
  color: var(--braille-color);
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 13px;
  z-index: 100;
  animation: toast-in 0.3s ease-out, toast-out 0.3s ease-in 1.5s forwards;
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
}

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

@keyframes toast-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ============================================================
   暗层回响 — 系统自动生成的消息
   ============================================================ */

.msg-echo {
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.04), rgba(100, 180, 255, 0.04)) !important;
  border: 1px solid rgba(0, 229, 160, 0.25) !important;
  position: relative;
  overflow: hidden;
}

.msg-echo::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    rgba(0, 229, 160, 0.06) 60deg,
    transparent 120deg,
    rgba(100, 180, 255, 0.06) 180deg,
    transparent 240deg,
    transparent 360deg
  );
  animation: echo-rotate 8s linear infinite;
  opacity: 0.6;
}

.msg-echo::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.3), rgba(100, 180, 255, 0.3)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: echo-border-pulse 3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes echo-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes echo-border-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.msg-echo .msg-braille {
  color: #7ae8c8;
  text-shadow: 0 0 12px rgba(0, 229, 160, 0.25);
}

.msg-echo .msg-author {
  color: var(--braille-color);
  opacity: 0.9;
  font-weight: 600;
}

.msg-echo-badge {
  display: inline-block;
  background: rgba(0, 229, 160, 0.15);
  color: var(--braille-color);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-right: 8px;
  font-family: var(--font-mono);
}

/* ============================================================
   回响展示区 — 最新回响 + 进度条 + 说明
   ============================================================ */

.echo-section {
  margin-top: 36px;
  margin-bottom: 10px;
}

.echo-card {
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.03), rgba(100, 180, 255, 0.03));
  border: 1px solid rgba(0, 229, 160, 0.12);
  border-radius: 12px;
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.echo-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 160, 0.4), rgba(100, 180, 255, 0.4), transparent);
  opacity: 0.5;
}

.echo-card:hover {
  border-color: rgba(0, 229, 160, 0.3);
  box-shadow: 0 4px 28px rgba(0, 229, 160, 0.06), 0 0 50px rgba(0, 229, 160, 0.03);
}

/* 回响标签行 */
.echo-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--braille-color);
  font-weight: 600;
}

.echo-label-icon {
  font-family: 'Segoe UI Symbol', 'Arial Unicode MS', monospace;
  font-size: 14px;
}

.echo-time {
  margin-left: auto;
  font-size: 12px;
  color: var(--dark-text-dim);
  font-weight: 400;
}

/* 回响解码内容 */
.echo-decoded {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(200, 220, 210, 0.85);
  white-space: pre-line;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  border-left: 2px solid rgba(0, 229, 160, 0.3);
  margin-bottom: 20px;
}

.echo-loading-text {
  color: var(--dark-text-dim);
  font-style: italic;
}

/* 进度条区域 */
.echo-progress-wrap {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  padding-top: 16px;
}

.echo-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.echo-progress-title {
  font-size: 12px;
  color: var(--dark-text-dim);
  letter-spacing: 0.5px;
}

.echo-progress-count {
  font-size: 14px;
  font-weight: 700;
  color: var(--braille-color);
  font-family: var(--font-mono);
}

.echo-progress-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}

.echo-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--braille-color), rgba(100, 180, 255, 0.8));
  border-radius: 2px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.echo-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: progress-shimmer 2s ease-in-out infinite;
}

@keyframes progress-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.echo-progress-detail {
  font-size: 11px;
  color: var(--dark-text-dim);
  opacity: 0.6;
}

/* 回响说明折叠区 */
.echo-about {
  margin-top: 12px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  overflow: hidden;
}

.echo-about-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  font-size: 12px;
  color: var(--dark-text-dim);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.echo-about-toggle:hover {
  color: var(--braille-color);
  background: rgba(0, 229, 160, 0.04);
}

.echo-about-arrow {
  font-size: 14px;
  transition: transform 0.3s;
}
.echo-about-arrow.open {
  transform: rotate(180deg);
}

.echo-about-body {
  padding: 0 14px 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--dark-text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  padding-top: 12px;
  margin: 0 14px;
}

.echo-about-body p {
  margin-bottom: 10px;
}

.echo-about-body p:last-child {
  margin-bottom: 0;
}

.echo-about-body strong {
  color: var(--braille-color);
  font-weight: 600;
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 600px) {
  .dark-container {
    padding: 12px 16px 40px;
  }

  .dark-header {
    padding: 16px 0 20px;
    margin-bottom: 20px;
  }

  nav.dark-nav {
    padding: 10px 14px;
  }

  nav.dark-nav .logo {
    font-size: 15px;
  }

  nav.dark-nav .nav-links a {
    font-size: 11px;
    padding: 4px 8px;
  }

  .braille-display {
    padding: 20px 16px;
    margin-bottom: 24px;
  }

  .braille-msg {
    font-size: 13px;
  }

  .send-actions {
    flex-direction: column;
  }

  .dark-btn {
    width: 100%;
    text-align: center;
  }

  .send-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .echo-card {
    padding: 16px;
  }

  .echo-decoded {
    font-size: 13px;
    padding: 12px;
  }

  .braille-display-hint {
    flex-direction: column;
    text-align: center;
  }
}