/* main.css — SecureChat */

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

/* 輸入框需可編輯/選取（覆蓋 body 的全站禁選取） */
input, textarea {
  -webkit-user-select: text; user-select: text;
  -webkit-touch-callout: default;
}

:root {
  --bg:          #07070f;
  --surface:     #0d0d1e;
  --surface2:    #12122a;
  --border:      #1e1e3f;
  --border-glow: #2a2a5a;

  --blue:        #00d4ff;
  --pink:        #ff2d9b;
  --grad:        linear-gradient(135deg, #00d4ff 0%, #ff2d9b 100%);
  --grad-soft:   linear-gradient(135deg, #00d4ff22 0%, #ff2d9b22 100%);

  --glow-b:      0 0 8px #00d4ff88, 0 0 24px #00d4ff44;
  --glow-p:      0 0 8px #ff2d9b88, 0 0 24px #ff2d9b44;
  --glow-sm:     0 0 6px #00d4ff55;

  --text:        #d8e8ff;
  --text-mute:   #5570a0;
  --text-bright: #ffffff;

  --me-bg:       #00d4ff12;
  --me-bdr:      #00d4ff40;
  --them-bg:     #ff2d9b0c;
  --them-bdr:    #ff2d9b35;

  --danger:      #ff3a5c;
  --radius:      14px;
  --font:        -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  /* App 質感：全站禁止文字選取與長按浮層（避免誤觸 Google 搜尋/複製） */
  -webkit-user-select: none; user-select: none;
  -webkit-touch-callout: none;
  /* 細微掃描線紋理 */
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 212, 255, 0.015) 2px,
    rgba(0, 212, 255, 0.015) 4px
  );
}

[data-screen] { display: none; flex-direction: column; height: 100dvh; }

/* ════════════════════════════════════
   通用元件
════════════════════════════════════ */
.card {
  background: var(--surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  padding: 32px 24px;
  max-width: 400px;
  width: 100%;
  margin: auto;
  box-shadow: 0 0 40px #00d4ff0f, 0 0 80px #ff2d9b08;
}

.field { margin-bottom: 14px; }
.field label {
  display: block; font-size: 0.78rem;
  color: var(--blue); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: .08em;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text-bright);
  font-size: 15px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
input:focus {
  border-color: var(--blue);
  box-shadow: var(--glow-sm);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--grad);
  color: #fff; font-weight: 700; font-size: 14px;
  border: none; border-radius: 8px; padding: 11px 20px;
  cursor: pointer; transition: opacity .15s, box-shadow .2s;
  text-decoration: none; letter-spacing: .03em;
}
.btn:hover:not(:disabled)  { opacity: .88; box-shadow: var(--glow-b); }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.btn.ghost {
  background: transparent;
  border: 1px solid var(--border-glow);
  color: var(--text);
}
.btn.ghost:hover { border-color: var(--blue); color: var(--blue); box-shadow: var(--glow-sm); }

.btn.danger {
  background: var(--danger); color: #fff;
}
.btn.full { width: 100%; }

.btn-group { display: flex; flex-direction: column; gap: 8px; }

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  color: var(--text);
  font-size: 1.1rem;
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; flex-shrink: 0;
  transition: border-color .2s, color .2s, box-shadow .2s;
}
.icon-btn:hover { border-color: var(--blue); color: var(--blue); box-shadow: var(--glow-sm); }

.error-msg { display: none; color: var(--danger); font-size: 0.83rem; margin-top: 10px; white-space: pre-line; line-height: 1.6; }

/* ════════════════════════════════════
   LOGIN
════════════════════════════════════ */
#screen-login {
  align-items: center; justify-content: center; padding: 16px;
}

.logo-wrap { text-align: center; margin-bottom: 28px; }
.logo-icon { font-size: 2.4rem; margin-bottom: 8px; filter: drop-shadow(0 0 12px #00d4ffaa); }

.logo-wrap h1 {
  font-size: 1.8rem; font-weight: 800; letter-spacing: .05em;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-wrap .subtitle {
  color: var(--text-mute); font-size: 0.83rem; margin-top: 4px;
}

.forgot-link {
  display: block; text-align: center; margin-top: 12px;
  font-size: 0.82rem; color: var(--text-mute); cursor: pointer;
}
.forgot-link:hover { color: var(--blue); }

.register-hint {
  margin-top: 16px; font-size: 0.8rem;
  color: var(--text-mute); text-align: center;
}

/* ════════════════════════════════════
   FRIENDS
════════════════════════════════════ */
#screen-friends { background: var(--bg); }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 1px 0 var(--border-glow);
}

.topbar-brand { display: flex; flex-direction: column; gap: 2px; }

.brand-title {
  font-size: 1.1rem; font-weight: 800; letter-spacing: .05em;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand-name {
  font-size: 0.75rem; color: var(--blue);
  font-family: 'Courier New', monospace;
  opacity: .85;
}

#friend-list { flex: 1; overflow-y: auto; padding: 6px 0; }

.friend-item {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 18px; cursor: pointer; transition: background .15s;
}
.friend-item:hover { background: var(--surface); }

.friend-avatar {
  width: 46px; height: 46px; border-radius: 14px;
  background: var(--grad);
  color: #fff; font-weight: 800; font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--glow-b);
}

.friend-info { flex: 1; min-width: 0; }
.friend-name {
  display: block; font-weight: 600; color: var(--text-bright);
  font-family: 'Courier New', monospace; font-size: 0.95rem;
}
.friend-sub { display: block; font-size: 0.78rem; color: var(--text-mute); margin-top: 2px; }
.friend-arrow { color: var(--border-glow); font-size: 1.3rem; }

.empty-state { text-align: center; padding: 70px 20px; color: var(--text-mute); }
.empty-icon { font-size: 2.5rem; margin-bottom: 14px; opacity: .5; }
.empty-state p { margin-bottom: 6px; }
.empty-state .hint { font-size: 0.82rem; color: var(--blue); opacity: .7; }

/* 使用說明 */
.usage-tips {
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.tips-toggle {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; font-size: 0.83rem; color: var(--text-mute);
  list-style: none; user-select: none;
}
.tips-toggle::-webkit-details-marker { display: none; }
.tips-arrow { transition: transform .2s; }
details[open] .tips-arrow { transform: rotate(90deg); }
.tips-body { margin-top: 10px; font-size: 0.8rem; color: var(--text-mute); line-height: 1.9; }
.tips-body strong { color: var(--blue); }
.tips-body li { margin-left: 14px; }

/* ════════════════════════════════════
   CHAT
════════════════════════════════════ */
#screen-chat { background: var(--bg); position: relative; }

.chat-header {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 1px 0 var(--border-glow);
  position: relative;
}

/* 訊息搜尋列（覆蓋於 header 上，滑入） */
#search-bar {
  position: absolute; inset: 0;
  display: flex; align-items: center; gap: 6px;
  padding: 0 10px; background: var(--surface); z-index: 5;
  animation: searchIn .2s ease;
}
#search-bar input {
  flex: 1; min-width: 0;
  background: var(--surface2); border: 1px solid var(--border-glow);
  border-radius: 8px; color: var(--text);
  padding: 6px 10px; font-size: 0.9rem;
}
#search-count { font-size: 0.72rem; color: var(--text-mute); min-width: 34px; text-align: center; }
@keyframes searchIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

.bubble.search-match { background: #ffff0022 !important; outline: 1px solid #ffff0088; }
.bubble.search-focus { background: #ffff0044 !important; outline: 2px solid #ffff00cc; }

#chat-title {
  flex: 1; font-weight: 700;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem; color: var(--text-bright);
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

.remove-btn { color: var(--danger); flex-shrink: 0; }
.remove-btn:hover { border-color: var(--danger); box-shadow: 0 0 6px #ff3a5c55; }

/* 已讀狀態橫幅 */
.read-status {
  padding: 5px 14px; font-size: 0.72rem; text-align: center;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.read-status.read   { color: var(--blue); }
.read-status.unread { color: var(--text-mute); }

#chat-status { font-size: 0.72rem; white-space: nowrap; }
.status-supabase { color: var(--blue); }
.status-p2p      { color: var(--pink); text-shadow: var(--glow-p); }
.status-p2p-poor { color: #ffaa00; }

#messages {
  flex: 1; overflow-y: auto; padding: 16px 14px;
  display: flex; flex-direction: column; gap: 8px;
}
#messages.drag-over {
  outline: 2px dashed var(--blue); outline-offset: -8px;
  background: #00d4ff08;
}

/* 日期分隔線 */
.date-sep {
  align-self: center; margin: 6px 0;
  font-size: 0.7rem; color: var(--text-mute);
}
.date-sep span {
  background: var(--surface2); padding: 3px 12px; border-radius: 10px;
  border: 1px solid var(--border);
}

/* 訊息內連結 */
.msg-link { color: var(--blue); text-decoration: underline; word-break: break-all; }

/* 回到底部按鈕 */
#scroll-bottom-btn {
  position: absolute; right: 16px; bottom: 76px; z-index: 20;
  width: 40px; height: 40px; border-radius: 50%;
  display: none; align-items: center; justify-content: center;
  background: var(--surface2); color: var(--blue);
  border: 1px solid var(--blue); cursor: pointer;
  font-size: 1.1rem; box-shadow: var(--glow-sm);
}

/* 圖片放大檢視 */
#lightbox {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(0,0,0,.92); align-items: center; justify-content: center;
  padding: 20px; cursor: zoom-out; overflow: hidden;
  touch-action: none;          /* 由 JS 接管 pinch / 拖曳 */
}
#lightbox-img {
  max-width: 100%; max-height: 100%; border-radius: 8px;
  transform-origin: center center;
  transition: transform .08s ease-out;
  touch-action: none; user-select: none; -webkit-user-drag: none;
  will-change: transform;
}
#lightbox-save-btn {
  position: absolute; bottom: 24px; right: 24px; z-index: 201;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--surface2); color: var(--blue);
  border: 1px solid var(--blue); cursor: pointer;
  font-size: 1.3rem; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--glow-sm);
}
#lightbox-save-btn:active { transform: scale(0.92); }

.message { display: flex; flex-direction: column; max-width: 78%; }
.message.me   { align-self: flex-end;   align-items: flex-end; }
.message.them { align-self: flex-start; align-items: flex-start; }

.bubble {
  border-radius: 16px; padding: 10px 15px;
  font-size: 15px; line-height: 1.55; word-break: break-word;
}
.message.me .bubble {
  background: var(--me-bg);
  border: 1px solid var(--me-bdr);
  border-bottom-right-radius: 4px;
  box-shadow: inset 0 0 0 0 transparent, 0 0 8px #00d4ff18;
}
.message.them .bubble {
  background: var(--them-bg);
  border: 1px solid var(--them-bdr);
  border-bottom-left-radius: 4px;
  box-shadow: 0 0 8px #ff2d9b0f;
}

.msg-meta {
  display: flex; align-items: center; gap: 4px;
  margin-top: 3px; padding: 0 4px;
}
.ts { font-size: 0.68rem; color: var(--text-mute); }

.msg-status::after { font-size: 0.7rem; }
.msg-status[data-status="sending"]::after { content: '⏳'; }
.msg-status[data-status="sent"]::after    { content: '✓'; color: var(--text-mute); }
.msg-status[data-status="p2p"]::after     { content: '⚡'; color: var(--blue); filter: drop-shadow(0 0 4px var(--blue)); }
.msg-status[data-status="failed"]::after  { content: '✗'; color: var(--danger); }

/* 打字提示 */
.typing-indicator {
  padding: 0 14px 2px;
  font-size: 0.75rem;
  color: var(--blue);
  font-style: italic;
  min-height: 18px;
  opacity: 0.85;
}

/* 未讀角標 */
.unread-badge {
  background: var(--pink);
  color: #fff;
  border-radius: 10px;
  padding: 2px 7px;
  font-size: 0.7rem;
  font-weight: 800;
  min-width: 20px;
  text-align: center;
  flex-shrink: 0;
  box-shadow: var(--glow-p);
}

/* 解密失敗訊息泡泡 */
.bubble.failed-bubble {
  color: var(--text-mute);
  font-style: italic;
  font-size: 0.83rem;
  border-style: dashed;
  opacity: 0.75;
}

/* 媒體泡泡（共用） */
.media-bubble {
  padding: 4px; max-width: 260px; cursor: pointer;
  -webkit-tap-highlight-color: transparent;   /* 消除點擊反藍 */
}
.media-bubble, .media-bubble * { -webkit-tap-highlight-color: transparent; }
.media-placeholder {
  padding: 18px 24px; font-size: 0.82rem;
  color: var(--text-mute); text-align: center; min-width: 120px;
}
.media-placeholder.failed { color: var(--danger); }
/* 隱藏原生 file input，只留自訂 📎 按鈕 */
#media-input {
  display: none !important;
  position: absolute;
  width: 0; height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

.img-btn { font-size: 1.1rem; flex-shrink: 0; opacity: 0.7; }
.img-btn:hover { opacity: 1; }

/* 圖片 */
.chat-img {
  display: block; max-width: 100%; max-height: 280px;
  border-radius: calc(var(--radius) - 4px);
  object-fit: contain;
}

/* 影片載入中佔位 */
.video-loading {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; padding: 28px 26px; min-width: 180px;
  background: linear-gradient(135deg, #0a0a18 0%, #12122a 100%);
  border-radius: calc(var(--radius) - 4px);
}
.video-loading-icon { font-size: 1.8rem; opacity: 0.7; filter: drop-shadow(0 0 6px #00d4ff66); }
.video-loading-text { font-size: 0.82rem; color: var(--text-bright); text-align: center; word-break: break-all; }
.video-loading-sub  { font-size: 0.72rem; color: var(--text-mute); }

/* 自訂影片播放器 */
.video-player {
  position: relative; display: inline-block; max-width: 100%;
  border-radius: calc(var(--radius) - 4px); overflow: hidden;
  background: #000; line-height: 0;
  -webkit-tap-highlight-color: transparent; user-select: none;
}
.chat-video {
  display: block; max-width: 100%; max-height: 320px;
  outline: none; -webkit-tap-highlight-color: transparent;
}
/* 大播放鍵（暫停時浮現） */
.vp-bigplay {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(7, 7, 15, 0.55); backdrop-filter: blur(6px);
  border: 1.5px solid #00d4ff88; color: var(--blue);
  font-size: 1.2rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 16px #00d4ff55; transition: opacity 0.2s, transform 0.15s;
}
.vp-bigplay:hover { transform: translate(-50%, -50%) scale(1.08); }
.video-player.playing .vp-bigplay { opacity: 0; pointer-events: none; }
/* 底部控制列 */
.vp-bar {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
  background: linear-gradient(to top, rgba(7,7,15,0.85) 0%, rgba(7,7,15,0) 100%);
  opacity: 0; transition: opacity 0.2s; line-height: 1;
}
.video-player:hover .vp-bar,
.video-player:not(.playing) .vp-bar { opacity: 1; }
.vp-bar button {
  background: none; border: none; color: var(--text-bright);
  font-size: 0.95rem; cursor: pointer; padding: 2px 4px; flex-shrink: 0;
}
.vp-bar button:hover { color: var(--blue); }
.vp-cur, .vp-dur { font-size: 0.68rem; color: var(--text); flex-shrink: 0; min-width: 30px; }
.vp-dur { text-align: right; }
.vp-track {
  flex: 1; height: 4px; border-radius: 2px;
  background: #ffffff22; cursor: pointer; overflow: hidden;
}
.vp-fill {
  height: 100%; width: 0%;
  background: var(--grad); box-shadow: 0 0 6px #00d4ff88;
}
/* 桌面全螢幕：外層容器鋪滿、影片置中填滿 */
.video-player:fullscreen,
.video-player:-webkit-full-screen {
  width: 100vw; height: 100vh; display: flex;
  align-items: center; justify-content: center; background: #000;
}
.video-player:fullscreen .chat-video,
.video-player:-webkit-full-screen .chat-video {
  width: 100%; height: 100%; max-height: 100vh; object-fit: contain;
}

/* 檔案 */
.file-bubble {
  display: flex; align-items: center; gap: 12px;
  padding: 8px 4px;
}
.file-icon { font-size: 1.8rem; flex-shrink: 0; }
.file-info { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.file-name {
  font-size: 0.88rem; color: var(--text-bright);
  font-weight: 600; word-break: break-all;
}
.file-size { font-size: 0.75rem; color: var(--text-mute); }

/* 好友頭像（線上狀態用） */
.friend-avatar-wrap { position: relative; flex-shrink: 0; }
.avatar-tap { cursor: pointer; }
.avatar-tap .friend-avatar { transition: transform .15s, box-shadow .15s; }
.avatar-tap:hover .friend-avatar { transform: scale(1.08); box-shadow: var(--glow-b), 0 0 0 2px var(--blue); }

.online-dot {
  position: absolute; bottom: 1px; right: 1px;
  width: 11px; height: 11px;
  background: #00e676;
  border-radius: 50%;
  border: 2px solid var(--bg);
  box-shadow: 0 0 6px #00e67688;
  animation: pulse-online 2s ease-in-out infinite;
}

@keyframes pulse-online {
  0%, 100% { box-shadow: 0 0 4px #00e67688; }
  50%       { box-shadow: 0 0 10px #00e676cc, 0 0 18px #00e67644; }
}

/* 指紋鎖屏 */
#biometric-lock {
  position: fixed; inset: 0;
  background: var(--bg);
  display: none;
  flex-direction: column;
  align-items: center; justify-content: center;
  z-index: 500;
}
.lock-content {
  display: flex; flex-direction: column;
  align-items: center; gap: 14px;
  text-align: center; padding: 24px;
}
.lock-logo { font-size: 3rem; filter: drop-shadow(0 0 16px #00d4ffaa); }
.lock-content h2 {
  font-size: 1.6rem; font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.lock-content > p { color: var(--text-mute); font-size: 0.9rem; }

/* ════════════════════════════════════
   PIN 鎖
════════════════════════════════════ */
#pin-lock {
  position: fixed; inset: 0;
  background: var(--bg);
  display: none;
  flex-direction: column;
  align-items: center; justify-content: center;
  z-index: 501;
}
.pin-dots { display: flex; gap: 12px; margin: 6px 0; }
.pin-dot {
  width: 12px; height: 12px; border-radius: 50%;
  border: 1px solid var(--border-glow); background: transparent;
  transition: background .12s, box-shadow .12s;
}
.pin-dot.filled { background: var(--blue); box-shadow: var(--glow-sm); border-color: var(--blue); }
.pin-pad {
  display: grid; grid-template-columns: repeat(3, 72px);
  gap: 12px; margin-top: 12px;
}
.pin-pad button {
  height: 72px; border-radius: 50%;
  background: var(--surface2); color: var(--text-bright);
  border: 1px solid var(--border-glow);
  font-size: 1.5rem; font-family: var(--font); cursor: pointer;
  transition: background .12s, transform .1s;
}
.pin-pad button:active:not(:disabled) { background: var(--surface); transform: scale(0.94); }
.pin-pad button:disabled { opacity: .35; cursor: default; }
.pin-pad button.pin-fn { font-size: 1.3rem; color: var(--blue); }

.input-row {
  display: flex; gap: 8px; padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
#msg-input { flex: 1; border-radius: 20px; padding: 10px 16px; }
.send-btn {
  border-radius: 50%; width: 42px; height: 42px;
  padding: 0; flex-shrink: 0; font-size: 1rem;
  box-shadow: var(--glow-sm);
}

/* ════════════════════════════════════
   MODAL
════════════════════════════════════ */
.modal {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(6px);
  align-items: flex-end; justify-content: center;
  z-index: 100; padding: 0;
}

.modal-box {
  background: var(--surface);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 24px 20px 32px;
  width: 100%; max-width: 480px;
  position: relative;
  box-shadow: 0 -4px 40px #00d4ff15, 0 -2px 0 var(--border-glow);
  max-height: 90dvh;
  overflow-y: auto;
}

.modal-close {
  position: absolute; top: 14px; right: 16px;
  background: none; border: none;
  color: var(--text-mute); font-size: 1.4rem;
  cursor: pointer; line-height: 1;
}
.modal-close:hover { color: var(--pink); }

.modal-box h3 {
  font-size: 1.05rem; font-weight: 700;
  background: var(--grad);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}
.modal-desc { font-size: 0.82rem; color: var(--text-mute); margin-bottom: 14px; }

.modal-section {
  margin-top: 20px; padding-top: 20px;
  border-top: 1px solid var(--border);
}
.modal-section:first-of-type { margin-top: 16px; padding-top: 0; border-top: none; }
.modal-section h4 {
  font-size: 0.75rem; color: var(--blue);
  text-transform: uppercase; letter-spacing: .1em;
  margin-bottom: 10px;
}

#invite-link-row { display: flex; gap: 8px; }
#invite-link-input { flex: 1; font-size: 11px; border-radius: 8px; }
#qr-canvas { display: flex; justify-content: center; margin: 12px 0; }

/* ════════════════════════════════════
   INVITE PAGE
════════════════════════════════════ */
#screen-invite { align-items: center; justify-content: center; padding: 16px; }

/* ════════════════════════════════════
   TOAST
════════════════════════════════════ */
#toast {
  position: fixed; bottom: 90px; left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--surface2);
  border: 1px solid var(--border-glow);
  box-shadow: var(--glow-sm);
  color: var(--text-bright);
  padding: 10px 22px; border-radius: 20px;
  font-size: 0.85rem; opacity: 0;
  transition: opacity .22s, transform .22s;
  pointer-events: none; white-space: nowrap; z-index: 200;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ════════════════════════════════════
   訊息動作選單（長按觸發）
════════════════════════════════════ */
#msg-action-sheet { display: none; position: fixed; inset: 0; z-index: 150; }
#msg-action-sheet.show { display: block; }

.action-sheet-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  animation: sheetFade .18s ease;
}
.action-sheet-box {
  position: absolute; left: 0; right: 0; bottom: 0;
  max-width: 480px; margin: 0 auto;
  background: var(--surface);
  border-top: 1px solid var(--border-glow);
  border-radius: var(--radius) var(--radius) 0 0;
  box-shadow: 0 -4px 40px #00d4ff15, 0 -2px 0 var(--border-glow);
  padding: 10px 12px calc(14px + env(safe-area-inset-bottom));
  animation: sheetUp .25s cubic-bezier(.16,1,.3,1);
}

.action-emoji-row {
  display: flex; justify-content: space-around; gap: 4px;
  padding: 6px 4px 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}
.emoji-btn {
  background: none; border: none; cursor: pointer;
  font-size: 1.5rem; line-height: 1;
  padding: 4px 8px; border-radius: 10px;
  transition: transform .12s, background .15s;
}
.emoji-btn:active { transform: scale(1.35); background: var(--surface2); }

.reaction-badge {
  position: absolute; bottom: -10px; right: 6px;
  font-size: 0.9rem; line-height: 1;
  background: var(--surface2);
  border: 1px solid var(--border-glow);
  border-radius: 12px; padding: 2px 5px;
  box-shadow: 0 1px 4px rgba(0,0,0,.45);
  z-index: 2;
}

/* ════════════════════════════════════
   引用回覆
════════════════════════════════════ */
#reply-preview {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-left: 3px solid var(--blue);
}
#reply-preview.q-them { border-left-color: var(--pink); }
#reply-preview .reply-icon { color: var(--blue); font-size: 1.1rem; }
#reply-preview.q-them .reply-icon { color: var(--pink); }
#reply-preview .reply-content { flex: 1; min-width: 0; display: flex; flex-direction: column; }
#reply-preview .reply-who  { font-size: 0.72rem; color: var(--text-mute); }
#reply-preview .reply-text {
  font-size: 0.82rem; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#reply-preview .reply-cancel {
  background: none; border: none; color: var(--text-mute);
  font-size: 1.3rem; cursor: pointer; line-height: 1; padding: 0 4px;
}

.quoted-msg {
  display: flex; flex-direction: column; gap: 1px;
  padding: 4px 8px; margin-bottom: 5px;
  border-left: 3px solid var(--blue);
  background: rgba(255,255,255,.04);
  border-radius: 4px;
}
.quoted-msg.q-them { border-left-color: var(--pink); }
.quoted-who  { font-size: 0.68rem; color: var(--text-mute); }
.quoted-text {
  font-size: 0.78rem; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  max-width: 240px;
}
.bubble-text { display: block; }

/* ════════════════════════════════════
   語音訊息
════════════════════════════════════ */
.voice-player {
  display: flex; align-items: center; gap: 10px;
  min-width: 190px; padding: 2px 0;
}
.voice-play {
  flex-shrink: 0;
  width: 34px; height: 34px; border-radius: 50%;
  border: none; cursor: pointer;
  background: var(--grad); color: #04121f;
  font-size: 0.9rem; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--glow-sm);
}
.voice-track {
  position: relative; flex: 1; height: 4px;
  background: var(--border-glow); border-radius: 2px; cursor: pointer;
}
.voice-ball {
  position: absolute; top: 50%; left: 0;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--blue); transform: translate(-50%, -50%);
  box-shadow: var(--glow-sm);
}
.voice-dur {
  flex-shrink: 0; font-size: 0.72rem;
  color: var(--text-mute); min-width: 34px; text-align: right;
}
.voice-loading { font-size: 0.82rem; color: var(--text-mute); }

/* 麥克風錄音狀態 */
#mic-btn.recording { color: var(--danger); animation: mic-pulse 0.8s infinite; }
@keyframes mic-pulse {
  0%, 100% { transform: scale(1);    filter: drop-shadow(0 0 0 transparent); }
  50%      { transform: scale(1.18); filter: drop-shadow(0 0 6px var(--danger)); }
}
#recording-banner {
  position: absolute; bottom: 76px; left: 50%;
  transform: translateX(-50%);
  background: var(--surface2); color: var(--danger);
  border: 1px solid var(--danger);
  padding: 6px 16px; border-radius: 20px;
  font-size: 0.8rem; z-index: 30;
  box-shadow: 0 0 10px #ff3a5c44;
}

.action-items { display: flex; flex-direction: column; }
.action-item {
  background: none; border: none;
  color: var(--text); font-family: var(--font);
  font-size: 1rem; padding: 14px 12px;
  text-align: center; cursor: pointer;
  border-radius: 10px; transition: background .15s;
}
.action-item:active { background: var(--surface2); }
.action-item.danger { color: var(--danger); }
.action-item.cancel {
  color: var(--text-mute); font-weight: 600;
  margin-top: 6px; border-top: 1px solid var(--border);
}

@keyframes sheetUp   { from { transform: translateY(100%); } to { transform: translateY(0); } }
@keyframes sheetFade { from { opacity: 0; } to { opacity: 1; } }

/* 已撤回訊息 + 撤回狀態小字 */
.recalled { color: var(--text-mute); font-style: italic; }
.recall-note {
  font-size: 0.68rem; color: #ffaa00;
  margin-top: 2px; padding: 0 6px;
}
.message.me  .recall-note { text-align: right; }
.message.them .recall-note { text-align: left; }

/* ════════════════════════════════════
   TEXTAREA（設定 & 備註）
════════════════════════════════════ */
textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border-glow);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text-bright);
  font-size: 14px;
  font-family: var(--font);
  outline: none;
  resize: vertical;
  line-height: 1.6;
  transition: border-color .2s, box-shadow .2s;
}
textarea:focus {
  border-color: var(--blue);
  box-shadow: var(--glow-sm);
}
textarea::placeholder { color: var(--text-mute); }

/* ════════════════════════════════════
   FRIEND PROFILE MODAL
════════════════════════════════════ */
.profile-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 4px;
}

#profile-avatar {
  width: 56px; height: 56px; border-radius: 16px;
  background: var(--grad);
  color: #fff; font-weight: 800; font-size: 1.4rem;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--glow-b);
}

.profile-meta {
  display: flex; flex-direction: column; gap: 4px; min-width: 0;
}

.profile-name {
  font-size: 1rem; font-weight: 700;
  color: var(--text-bright);
  font-family: 'Courier New', monospace;
}

.profile-bio {
  font-size: 0.82rem;
  color: var(--text-mute);
  line-height: 1.5;
  word-break: break-word;
}

/* ════════════════════════════════════
   EMPTY CHAT STATE
════════════════════════════════════ */
.chat-empty {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  flex: 1; gap: 12px;
  color: var(--text-mute);
  padding: 40px 20px;
  pointer-events: none; user-select: none;
}
.chat-empty-icon { font-size: 2.8rem; opacity: .35; }
.chat-empty p { font-size: 0.83rem; text-align: center; opacity: .7; }

/* ════════════════════════════════════
   SCROLLBAR
════════════════════════════════════ */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-glow); border-radius: 3px; }