/* 悄悄話 — 兩人一室。晨光下的霧藍:明亮、安靜、陪伴。
   視訊舞台刻意保留深色(全螢幕視訊內容以深色包框最舒適)。 */

:root {
  --paper-0: #eef2f7; /* 頁面底 */
  --paper-1: #ffffff; /* 卡片面 */
  --paper-2: #e6ecf3; /* 輸入/次要面 */
  --line: rgba(56, 74, 97, 0.14);
  --text-hi: #27313e;
  --text-mid: #5a6a7d;
  --text-low: #8d9aa9;
  --accent: #5b82a8; /* 低飽和霧藍 */
  --accent-hi: #7ea4c8;
  --accent-ink: #ffffff;
  --rose: #b96a6a;
  --peer-off: #d7dde4; /* 對方未加入:灰 */
  --peer-on: #4f9674; /* 對方在線上:綠 */
  --ink-0: #10151c; /* 視訊舞台仍用的深色 */
  --radius: 16px;
  --shadow: 0 14px 40px -22px rgba(39, 61, 88, 0.35);
  --font-display: "Songti TC", "Noto Serif TC", "Source Han Serif TC", serif;
  --font-body: "PingFang TC", "Noto Sans TC", -apple-system, sans-serif;
}

* { box-sizing: border-box; }

/* hidden 屬性必須壓過任何 display 規則 */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-hi);
  background:
    radial-gradient(50rem 34rem at 10% -6%, rgba(91, 130, 168, 0.12), transparent 60%),
    radial-gradient(44rem 30rem at 106% 108%, rgba(91, 130, 168, 0.1), transparent 55%),
    var(--paper-0);
  -webkit-font-smoothing: antialiased;
}

#app { min-height: 100dvh; display: grid; }

button { font: inherit; cursor: pointer; }
input { font: inherit; }

svg { width: 1.35em; height: 1.35em; }
svg .slash { stroke: var(--rose); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ============ 加入畫面 ============ */

.join {
  width: min(560px, 100%);
  margin: auto;
  padding: 3rem 1.5rem 2.5rem;
  display: grid;
  gap: 1.8rem;
  text-align: center;
}

.brand { display: grid; gap: 0.75rem; }

.brand-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.55em;
  text-indent: 0.55em; /* 抵銷最後一字的字距,維持置中 */
  animation: rise 0.7s 0.05s backwards ease-out;
}

.brand-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 8vw, 3.4rem);
  letter-spacing: 0.12em;
  animation: rise 0.7s 0.15s backwards ease-out;
}

.brand-sub {
  margin: 0;
  color: var(--text-mid);
  font-size: 0.92rem;
  line-height: 1.9;
  animation: rise 0.7s 0.25s backwards ease-out;
}

.mode-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.7rem;
  animation: rise 0.7s 0.35s backwards ease-out;
}

.mode-card {
  display: grid;
  justify-items: center;
  gap: 0.3rem;
  padding: 1.1rem 0.6rem 0.95rem;
  background: var(--paper-1);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-mid);
  transition: border-color 0.25s, color 0.25s, transform 0.25s, box-shadow 0.25s;
}

.mode-card:hover { transform: translateY(-2px); color: var(--text-hi); box-shadow: var(--shadow); }

.mode-card[aria-checked='true'] {
  border-color: var(--accent);
  color: var(--text-hi);
  box-shadow: 0 0 0 1px rgba(91, 130, 168, 0.45), var(--shadow);
}

.mode-icon { color: var(--accent); display: grid; }
.mode-icon svg { width: 1.7rem; height: 1.7rem; }
.mode-label { font-family: var(--font-display); font-size: 1.15rem; letter-spacing: 0.2em; text-indent: 0.2em; }
.mode-desc { font-size: 0.74rem; color: var(--text-low); }

.join-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.6rem;
  animation: rise 0.7s 0.45s backwards ease-out;
}

.join-form input {
  padding: 0.85rem 1.1rem;
  background: var(--paper-1);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text-hi);
  letter-spacing: 0.08em;
}
.join-form input::placeholder { color: var(--text-low); letter-spacing: 0.02em; }
.join-form input:focus { border-color: var(--accent); outline: none; }

.join-form button {
  padding: 0.85rem 1.6rem;
  border: none;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--accent-hi), var(--accent));
  color: var(--accent-ink);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-indent: 0.15em;
  transition: filter 0.2s, transform 0.2s;
}
.join-form button:hover { filter: brightness(1.06); transform: translateY(-1px); }

.join-error { margin: 0; color: var(--rose); font-size: 0.9rem; }
.join-hint {
  margin: 0;
  color: var(--text-low);
  font-size: 0.78rem;
  animation: rise 0.7s 0.55s backwards ease-out;
}

/* 公開房清單(REQ-20) */
.lobby {
  display: grid;
  gap: 0.6rem;
  text-align: left;
  animation: rise 0.7s 0.6s backwards ease-out;
}

.lobby-title {
  margin: 0.4rem 0 0;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.25em;
  color: var(--text-mid);
}

.lobby-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.lobby-room {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.75rem 1rem;
  background: var(--paper-1);
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text-hi);
  text-align: left;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.lobby-room:hover { border-color: var(--accent); transform: translateY(-1px); box-shadow: var(--shadow); }

.lobby-icon { color: var(--accent); display: grid; }
.lobby-icon svg { width: 1.35rem; height: 1.35rem; }
.lobby-text { flex: 1; display: grid; gap: 0.1rem; }
.lobby-text strong { font-weight: 600; font-size: 0.92rem; }
.lobby-text small { color: var(--text-low); font-size: 0.75rem; }

.lobby-join {
  padding: 0.35rem 0.95rem;
  border-radius: 999px;
  background: var(--paper-2);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
}
.lobby-room:hover .lobby-join { background: var(--accent); color: var(--accent-ink); }

.lobby-empty { margin: 0; color: var(--text-low); font-size: 0.8rem; }

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

/* ============ 通用控制 ============ */

.ctl {
  width: 3.4rem;
  height: 3.4rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--paper-1);
  color: var(--text-hi);
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}
.ctl:hover { transform: translateY(-2px); border-color: var(--accent); }
.ctl svg { width: 1.45rem; height: 1.45rem; }

/* 開關型按鈕:兩個圖示依 aria-pressed 切換 */
.ctl[aria-pressed] svg:nth-of-type(1) { display: block; }
.ctl[aria-pressed] svg:nth-of-type(2) { display: none; }
.ctl[aria-pressed='false'] svg:nth-of-type(1) { display: none; }
.ctl[aria-pressed='false'] svg:nth-of-type(2) { display: block; }
.ctl[aria-pressed='false'] { border-color: rgba(185, 106, 106, 0.5); color: var(--text-mid); }

.ctl-danger { border-color: rgba(185, 106, 106, 0.45); color: var(--rose); }
.ctl-danger:hover { background: rgba(185, 106, 106, 0.12); border-color: var(--rose); }

/* 單圖示開關(如柔膚):不做雙圖示切換,以邊框光暈表示啟用 */
.ctl-single[aria-pressed] svg:nth-of-type(1) { display: block; }
.ctl-single[aria-pressed='false'] { border-color: rgba(238, 242, 247, 0.2); color: #8fa0b1; }
.ctl-single[aria-pressed='true'] {
  border-color: var(--accent-hi);
  color: #d5e5f4;
  box-shadow: 0 0 18px -4px rgba(126, 164, 200, 0.85);
}

/* ============ 視訊舞台(刻意維持深色) ============ */

.stage { position: fixed; inset: 0; background: #000; }

/* 9:16 直式滿高置中(REQ-23);寬螢幕左右留黑,如直式短片播放器 */
.stage video#remoteVideo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: min(100dvh, calc(100vw * 16 / 9));
  aspect-ratio: 9 / 16;
  object-fit: cover;
}

.stage-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0.9rem;
  color: rgba(221, 230, 239, 0.55);
  background:
    radial-gradient(38rem 26rem at 50% 42%, rgba(91, 130, 168, 0.14), transparent 65%),
    var(--ink-0);
}
.stage-empty-icon svg { width: 2.6rem; height: 2.6rem; opacity: 0.55; }
.stage-empty p { margin: 0; font-family: var(--font-display); letter-spacing: 0.25em; text-indent: 0.25em; }

.stage video#localVideo {
  position: absolute;
  top: calc(max(1rem, env(safe-area-inset-top)) + 3rem); /* 讓出頂部狀態藥丸列 */
  right: 1rem;
  width: clamp(96px, 22vw, 170px);
  aspect-ratio: 9 / 16;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid rgba(238, 242, 247, 0.35);
  box-shadow: 0 18px 44px -18px rgba(0, 0, 0, 0.8);
  transform: scaleX(-1); /* 自己的預覽如照鏡子(慣例);對方看到的方向不受影響 */
}

.stage-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  gap: 0.5rem;
  padding: max(1rem, env(safe-area-inset-top)) 1rem 2.5rem;
  background: linear-gradient(rgba(0, 0, 0, 0.5), transparent);
  pointer-events: none;
}

.pill {
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: rgba(16, 21, 28, 0.55);
  border: 1px solid rgba(238, 242, 247, 0.18);
  color: #dde6ef;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  backdrop-filter: blur(10px);
}
.pill-dim { color: rgba(221, 230, 239, 0.75); }

/* 浮水印保護徽章:僅盾牌圖示,細節放 tooltip */
.wm-pill { margin-left: auto; display: grid; place-items: center; padding: 0.35rem 0.55rem; }
.wm-pill svg { width: 1.05rem; height: 1.05rem; color: #bfe3cf; }

/* 對方狀態圓點(視訊舞台):灰=等待/離開、綠=在線、琥珀=重連中 */
[data-testid='peer-status'].peer-dot {
  align-self: center;
  width: 0.8rem;
  height: 0.8rem;
  padding: 0;
  border-radius: 50%;
  background: #97a3b0;
  border: 2px solid rgba(255, 255, 255, 0.4);
  transition: background 0.3s, box-shadow 0.3s;
}
.peer-dot[data-state='online'] {
  background: var(--peer-on);
  box-shadow: 0 0 10px rgba(79, 150, 116, 0.95);
}
.peer-dot[data-state='waiting'],
.peer-dot[data-state='reconnecting'] { animation: dot-pulse 1.6s infinite ease-in-out; }
.peer-dot[data-state='reconnecting'] { background: #d9a13c; }

@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.stage-notice {
  position: absolute;
  bottom: 7.5rem;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  background: rgba(16, 21, 28, 0.75);
  border: 1px solid rgba(238, 242, 247, 0.18);
  color: #c6d2df;
  font-size: 0.82rem;
  max-width: min(90vw, 30rem);
  text-align: center;
}

.stage-controls {
  position: absolute;
  bottom: max(1.4rem, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.9rem;
  padding: 0.55rem;
  border-radius: 999px;
  background: rgba(16, 21, 28, 0.6);
  border: 1px solid rgba(238, 242, 247, 0.16);
  backdrop-filter: blur(16px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
}

/* 自動隱藏(進房 3 秒/點畫面切換);visibility 讓隱藏時不可點擊 */
.stage.controls-hidden .stage-controls {
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 10px);
}

/* 舞台上的圓鍵改用深色面(懸浮於視訊之上) */
.stage-controls .ctl {
  background: rgba(30, 38, 48, 0.85);
  border-color: rgba(238, 242, 247, 0.2);
  color: #eef2f7;
  backdrop-filter: blur(12px);
}
.stage-controls .ctl[aria-pressed='false'] { color: #b9c5d2; }

/* 單圖示開關(柔膚)啟用時的明顯 highlight:填滿主色(特異度需壓過上方規則) */
.stage-controls .ctl-single[aria-pressed='true'] {
  background: var(--accent);
  border-color: var(--accent-hi);
  color: #ffffff;
  box-shadow: 0 0 22px -2px rgba(126, 164, 200, 0.95);
}

/* ============ 語音/文字房間 ============ */

.room {
  width: min(720px, 100%);
  margin: 0 auto;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper-1);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.room-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 242, 247, 0.6);
}

.room-title { display: grid; gap: 0.3rem; justify-items: start; }
.room-title [data-testid='room-status'] {
  font-family: var(--font-display);
  letter-spacing: 0.14em;
  font-size: 1.02rem;
}

.leave-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--paper-1);
  color: var(--text-mid);
  font-size: 0.82rem;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.leave-link:hover { color: var(--rose); border-color: rgba(185, 106, 106, 0.55); background: rgba(185, 106, 106, 0.07); }
.leave-link svg { width: 1.05rem; height: 1.05rem; }

/* 語音場景:同心圓呼吸 */
.voice-scene {
  display: grid;
  justify-items: center;
  gap: 0.9rem;
  padding: 1.6rem 1rem 1.4rem;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 242, 247, 0.4);
}

.voice-rings {
  position: relative;
  width: 6.4rem;
  height: 6.4rem;
  display: grid;
  place-items: center;
}
.voice-rings > span:not(.voice-core) {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(91, 130, 168, 0.4);
  opacity: 0;
}
.voice-scene.live .voice-rings > span:not(.voice-core) { animation: ripple 2.8s infinite ease-out; }
.voice-scene.live .voice-rings > span:nth-child(2) { animation-delay: 0.9s; }
.voice-scene.live .voice-rings > span:nth-child(3) { animation-delay: 1.8s; }

.voice-core {
  width: 3.6rem;
  height: 3.6rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--paper-1);
  border: 1px solid rgba(91, 130, 168, 0.5);
  color: var(--accent);
}
.voice-scene.live .voice-core { box-shadow: 0 0 34px -6px rgba(91, 130, 168, 0.65); }

@keyframes ripple {
  from { transform: scale(0.62); opacity: 0.9; }
  to { transform: scale(1.28); opacity: 0; }
}

.voice-scene p { margin: 0; color: var(--text-mid); font-size: 0.84rem; letter-spacing: 0.12em; }

/* 訊息 */
#messages {
  list-style: none;
  margin: 0;
  padding: 1.1rem 1.2rem;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  scrollbar-width: thin;
  scrollbar-color: #c6d0db transparent;
}

.msg {
  max-width: 76%;
  padding: 0.55rem 0.85rem;
  border-radius: 14px;
  line-height: 1.65;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  animation: msg-in 0.25s ease-out;
}
.msg.self {
  align-self: flex-end;
  background: linear-gradient(150deg, var(--accent-hi), var(--accent));
  color: var(--accent-ink);
  border-bottom-right-radius: 5px;
}
.msg.peer {
  align-self: flex-start;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-bottom-left-radius: 5px;
}

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

.room-notice {
  margin: 0;
  padding: 0.4rem 1.2rem;
  color: var(--text-mid);
  font-size: 0.8rem;
  border-top: 1px solid var(--line);
}

/* 輸入列 */
.composer {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1rem calc(0.8rem + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: rgba(238, 242, 247, 0.6);
}

.composer input {
  flex: 1;
  min-width: 0;
  padding: 0.72rem 1rem;
  background: var(--paper-1);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-hi);
}
.composer input::placeholder { color: var(--text-low); }
.composer input:focus { border-color: var(--accent); outline: none; }

.ctl-inline { width: 2.9rem; height: 2.9rem; flex-shrink: 0; }
.ctl-inline svg { width: 1.25rem; height: 1.25rem; }

.send-btn {
  width: 2.9rem;
  height: 2.9rem;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border: none;
  border-radius: 50%;
  background: linear-gradient(160deg, var(--accent-hi), var(--accent));
  color: var(--accent-ink);
  transition: filter 0.2s, transform 0.15s;
}
.send-btn:hover { filter: brightness(1.06); transform: translateY(-1px); }
.send-btn svg { width: 1.2rem; height: 1.2rem; }

/* ============ 對方狀態徽章(未加入灰、上線綠;置於此處以覆蓋 .pill 背景) ============ */

[data-testid='peer-status'] {
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  width: fit-content;
  background: var(--peer-off);
  color: var(--text-mid);
  font-size: 0.78rem;
  transition: background 0.3s, color 0.3s;
}

[data-testid='peer-status'].online {
  background: var(--peer-on);
  color: #ffffff;
}

/* ============ RWD ============ */

@media (max-width: 640px) {
  /* 手機直式螢幕比 9:16 更瘦長:視訊滿版裁切,不留上下黑條(使用者回饋) */
  .stage video#remoteVideo {
    width: 100%;
    height: 100%;
    aspect-ratio: auto;
    object-fit: cover;
  }

  /* 頂部狀態列收窄 */
  .stage-top { padding: max(0.5rem, env(safe-area-inset-top)) 0.75rem 1.25rem; }
  .pill { font-size: 0.7rem; padding: 0.25rem 0.6rem; }
  .stage video#localVideo { top: calc(max(0.5rem, env(safe-area-inset-top)) + 2.4rem); }

  .room { border-left: none; border-right: none; }
  .join { padding-top: 10vh; }
  .mode-picker { gap: 0.5rem; }
  .mode-desc { display: none; } /* 小螢幕留白優先 */
  .join-form { grid-template-columns: 1fr; }
  .ctl { width: 3.6rem; height: 3.6rem; } /* 觸控目標 */
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}