*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  :root {
    --black: #0a0a0a;
    --white: #f5f5f0;
    --gray-100: #e8e8e3;
    --gray-200: #d0d0ca;
    --gray-400: #6e6e68;
    --gray-600: #4a4a44;
    --border: 1px solid var(--black);
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'IBM Plex Sans KR', sans-serif;
  }
  html { font-size: 14px; }
  body { background: var(--white); color: var(--black); font-family: var(--mono); min-height: 100vh; overflow-x: hidden; }

  /* ── HEADER ── */
  header {
    border-bottom: 2px solid var(--black);
    padding: 0 2rem;
    display: flex; align-items: stretch; height: 52px;
    position: sticky; top: 0;
    background: var(--white); z-index: 100;
  }
  .logo { font-size: 0.85rem; font-weight: 600; letter-spacing: 0.05em; display: flex; align-items: center; padding-right: 2rem; border-right: var(--border); }
  .logo span { color: var(--gray-400); font-weight: 300; }
  nav { display: flex; align-items: stretch; }
  nav button {
    background: none; border: none; border-right: var(--border);
    padding: 0 1.5rem; font-family: var(--mono); font-size: 0.78rem;
    letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer;
    color: var(--gray-400); transition: all 0.15s; position: relative;
  }
  nav button:first-child { border-left: var(--border); margin-left: 1.5rem; }
  nav button.active { color: var(--black); font-weight: 500; }
  nav button.active::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--black); }
  nav button:hover:not(.active) { color: var(--black); background: var(--gray-100); }
  .header-right { margin-left: auto; display: flex; align-items: center; gap: 1.5rem; font-size: 0.72rem; color: var(--gray-400); }
  .fb-status { display: flex; align-items: center; gap: 0.4rem; }
  .fb-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--gray-400); }
  .fb-dot.ok { background: #27ae60; }
  .fb-dot.err { background: #c0392b; }

  /* ── PAGES ── */
  main { display: none; }
  main.active { display: block; }

  /* ── MEMO ── */
  #memo-page {
      display: grid;
      grid-template-columns: 300px minmax(0, 1fr);
      grid-template-rows: auto minmax(0, 1fr);
      height: calc(100vh - 52px);
      overflow: hidden;
      padding: 2rem;
      max-width: 1200px;
      margin: 0 auto;
  }
  #memo-page .page-heading { grid-column: 1 / -1; }
  /* CSS의 display:grid는 JS에서 style.display로 덮어쓰므로 별도 처리 */
  .memo-sidebar {
    border: 2px solid var(--black);
    border-right: none;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
  }
  .sidebar-top { padding: 1.25rem 1.25rem 1rem; border-bottom: var(--border); display: flex; align-items: center; justify-content: flex-end; position: sticky; top: 0; background: var(--white); z-index: 10; }
  .sidebar-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); }
  .btn-new { background: var(--black); color: var(--white); border: none; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em; padding: 0.45rem 0.85rem; min-height: 36px; cursor: pointer; transition: opacity 0.15s; }
  .btn-new:hover { opacity: 0.7; }
  .btn-new:active { opacity: 0.5; }
  .memo-list { flex: 1; }
  .memo-item { padding: 1rem 1.25rem; border-bottom: var(--border); cursor: pointer; transition: background 0.1s; }
  .memo-item:hover { background: var(--gray-100); }
  .memo-item:active { background: var(--gray-200); }
  .memo-item.active { background: var(--black); color: var(--white); }
  .memo-item-title { font-size: 0.82rem; font-weight: 500; margin-bottom: 0.3rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .memo-item-preview { font-size: 0.72rem; color: var(--gray-400); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .memo-item-date { font-size: 0.65rem; color: var(--gray-400); margin-top: 0.3rem; }
  .memo-item.active .memo-item-preview,
  .memo-item.active .memo-item-date { color: var(--gray-200); }
  .memo-count { font-size: 0.65rem; color: var(--gray-400); padding: 0.75rem 1.25rem; border-top: var(--border); text-align: center; }
  .memo-editor { display: flex; flex-direction: column; overflow: hidden; border: 2px solid var(--black); min-width: 0; min-height: 0; }
  .editor-bar { padding: 1rem 2.5rem; border-bottom: var(--border); display: flex; gap: 0.75rem; align-items: center; }
  .memo-title-input { flex: 1; border: none; background: transparent; font-family: var(--mono); font-size: 1.1rem; font-weight: 500; color: var(--black); outline: none; }
  .memo-title-input::placeholder { color: var(--gray-400); }
  .memo-content-area { flex: 1; border: none; background: transparent; font-family: var(--sans); font-size: 0.9rem; line-height: 1.8; color: var(--black); padding: 2rem 2.5rem; outline: none; resize: none; }
  .memo-content-area::placeholder { color: var(--gray-400); }
  .btn-icon { background: none; border: var(--border); padding: 0.5rem 0.85rem; font-family: var(--mono); font-size: 0.7rem; cursor: pointer; color: var(--gray-600); transition: all 0.15s; min-height: 36px; }
  .btn-icon:hover, .btn-icon:focus { background: var(--black); color: var(--white); border-color: var(--black); outline: none; }
  .btn-icon:active { opacity: 0.7; }
  .btn-icon.danger:hover, .btn-icon.danger:focus { background: #c0392b; border-color: #c0392b; color: var(--white); outline: none; }
  .btn-icon.danger:active { background: #a93226; border-color: #a93226; color: var(--white); }
  .memo-empty { display: flex; align-items: center; justify-content: center; height: 100%; flex-direction: column; gap: 0.75rem; color: var(--gray-400); }
  .memo-empty-icon { font-size: 2rem; opacity: 0.3; }
  .memo-empty-text { font-size: 0.78rem; letter-spacing: 0.08em; }
  .save-hint { font-size: 0.65rem; color: var(--gray-400); padding: 0 2.5rem 0.75rem; text-align: right; opacity: 0; transition: opacity 0.3s; min-height: 1.2em; }
  .save-hint.show { opacity: 1; }

  /* ── P2P ── */
  #p2p-page { padding: 2rem; max-width: 900px; margin: 0 auto; }
  .page-heading { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: var(--gray-400); margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 2px solid var(--black); display: flex; justify-content: space-between; align-items: center; }
  .p2p-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
  .panel { border: 2px solid var(--black); padding: 1.5rem; }
  .panel-title { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1.25rem; padding-bottom: 0.75rem; border-bottom: var(--border); display: flex; align-items: center; gap: 0.5rem; }
  .dot { width: 6px; height: 6px; background: var(--gray-200); border-radius: 50%; flex-shrink: 0; }
  .dot.green { background: #27ae60; animation: pulse 1.5s infinite; }
  @keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.3} }
  .input-row { display: flex; gap: 0.5rem; margin-bottom: 0.75rem; }
  .input-field { flex: 1; border: var(--border); background: transparent; font-family: var(--mono); font-size: 0.8rem; padding: 0.5rem 0.75rem; color: var(--black); outline: none; }
  .input-field:focus { border-width: 2px; }
  .input-field::placeholder { color: var(--gray-400); }
  .btn-primary { background: var(--black); color: var(--white); border: 2px solid var(--black); font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.05em; padding: 0.5rem 1rem; cursor: pointer; transition: all 0.15s; text-transform: uppercase; white-space: nowrap; }
  .btn-primary:hover, .btn-primary:focus { background: transparent; color: var(--black); outline: none; }
  .btn-secondary { background: transparent; color: var(--black); border: var(--border); font-family: var(--mono); font-size: 0.75rem; padding: 0.5rem 1rem; cursor: pointer; transition: all 0.15s; text-transform: uppercase; }
  .btn-secondary:hover { background: var(--black); color: var(--white); }
  .room-info { background: var(--gray-100); border: var(--border); padding: 0.75rem; font-size: 0.75rem; margin-bottom: 0.75rem; display: flex; justify-content: space-between; align-items: center; }
  .room-id-val { font-weight: 600; letter-spacing: 0.08em; }
  .badge { font-size: 0.65rem; padding: 0.15rem 0.5rem; letter-spacing: 0.08em; text-transform: uppercase; border: var(--border); background: var(--white); }
  .chat-area { height: 220px; border: var(--border); overflow-y: auto; padding: 0.75rem; font-size: 0.78rem; line-height: 1.6; margin-bottom: 0.75rem; font-family: var(--sans); }
  .chat-msg { margin-bottom: 0.4rem; }
  .chat-msg .who { font-family: var(--mono); font-size: 0.65rem; color: var(--gray-400); margin-right: 0.5rem; }
  .chat-msg.mine .who { color: var(--black); font-weight: 600; }
  .chat-msg.sys { color: var(--gray-400); font-style: italic; font-size: 0.72rem; }
  .p2p-drop { border: 2px dashed var(--gray-200); padding: 1.5rem; text-align: center; cursor: pointer; font-size: 0.75rem; color: var(--gray-400); transition: all 0.15s; margin-bottom: 0.75rem; }
  .p2p-drop:hover, .p2p-drop:focus, .p2p-drop.over { border-color: var(--black); background: var(--gray-100); color: var(--black); outline: none; }
  .transfer-item { display: flex; align-items: center; gap: 0.75rem; padding: 0.5rem 0; border-bottom: var(--border); font-size: 0.75rem; }
  .transfer-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .tbar { width: 70px; height: 3px; background: var(--gray-200); flex-shrink: 0; }
  .tfill { height: 100%; background: var(--black); transition: width 0.3s; width: 0%; }
  .tpct { font-size: 0.65rem; color: var(--gray-400); width: 30px; text-align: right; }

  /* ── FILES ── */
  #files-page { padding: 2rem; max-width: 900px; margin: 0 auto; }
  .upload-zone { border: 2px dashed var(--black); padding: 3rem 2rem; text-align: center; cursor: pointer; transition: background 0.2s; margin-bottom: 2rem; position: relative; }
  .upload-zone:hover, .upload-zone.over { background: var(--gray-100); }
  .upload-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
  .upload-icon { font-size: 2.5rem; margin-bottom: 0.75rem; opacity: 0.3; }
  .upload-text { font-size: 0.8rem; color: var(--gray-400); }
  .upload-text strong { color: var(--black); }
  .upload-note { font-size: 0.7rem; color: var(--gray-400); margin-top: 0.4rem; }
  .upload-progress { display: none; margin-bottom: 1.5rem; }
  .upload-progress.show { display: block; }
  .prog-bar { width: 100%; height: 2px; background: var(--gray-200); margin-bottom: 0.5rem; }
  .prog-fill { height: 100%; background: var(--black); transition: width 0.3s; width: 0%; }
  .prog-text { font-size: 0.72rem; color: var(--gray-400); text-align: center; }
  .files-table { width: 100%; border-collapse: collapse; }
  .files-table th { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-400); padding: 0.6rem 0.75rem; text-align: left; border-bottom: 2px solid var(--black); font-weight: 400; }
  .files-table td { padding: 0.75rem; border-bottom: var(--border); font-size: 0.8rem; vertical-align: middle; }
  .files-table tr:hover td { background: var(--gray-100); }
  .fname { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .fmeta { color: var(--gray-400); white-space: nowrap; font-size: 0.75rem; }
  .factions { display: flex; gap: 0.5rem; justify-content: flex-end; }
  .btn-dl, .btn-rm { border: var(--border); background: none; font-family: var(--mono); font-size: 0.65rem; padding: 0.25rem 0.6rem; cursor: pointer; letter-spacing: 0.05em; text-transform: uppercase; transition: all 0.15s; color: var(--black); }
  .btn-dl:hover, .btn-dl:focus { background: var(--black); color: var(--white); border-color: var(--black); outline: none; }
  .btn-rm:hover, .btn-rm:focus { background: #c0392b; color: var(--white); border-color: #c0392b; outline: none; }
  .loading-row { opacity: 0.5; pointer-events: none; }
  .empty-state { text-align: center; padding: 3rem; color: var(--gray-400); font-size: 0.78rem; letter-spacing: 0.05em; border: var(--border); }


  /* ── SLEEP ── */
  #sleep-page { padding: 2rem; max-width: 1000px; margin: 0 auto; }
  .sleep-chart-wrap { border: 2px solid var(--black); padding: 1.4rem 1.5rem; margin-bottom: 2rem; }
  .sleep-chart-title { font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); margin-bottom: 1rem; }
  #sleep-chart { display: block; width: 100%; height: 220px; }
  .sleep-status-label { font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); margin-bottom: 1rem; }
  .sleep-log-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
  .sleep-actions { display: flex; gap: 0.5rem; }
  .sleep-actions button { font-size: 0.65rem; padding: 0.4rem 0.8rem; }
  .sleep-actions button:disabled { opacity: 0.35; cursor: not-allowed; }
  .sleep-actions button:disabled:hover { background: transparent; color: var(--black); }
  .sleep-log-list { display: flex; flex-direction: column; gap: 0.9rem; }
  .sleep-log-item { border: var(--border); padding: 1.15rem 1rem; background: var(--white); min-height: 94px; }
  .sleep-log-top { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: 0.55rem; align-items: flex-start; }
  .sleep-log-date { font-size: 0.68rem; font-weight: 600; }
  .sleep-log-duration { font-size: 0.62rem; color: var(--gray-400); white-space: nowrap; }
  .sleep-log-times { font-size: 0.68rem; font-family: var(--sans); line-height: 1.9; color: var(--black); }
  .sleep-empty { border: var(--border); padding: 2rem; text-align: center; color: var(--gray-400); font-size: 0.68rem; }
  .sleep-src { display: inline-block; margin-left: 0.5rem; padding: 0.05rem 0.4rem; border: 1px solid var(--gray-400); font-size: 0.52rem; font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--gray-400); vertical-align: middle; }
  .sleep-src-android { border-color: var(--black); color: var(--black); }
  /* 하루 단위 카드 (안드로이드 앱과 같은 구성) */
  .sleep-day { border: 1px solid var(--black); padding: 1rem 1rem; background: var(--white); }
  .sleep-day-head { display: flex; justify-content: space-between; align-items: center; }
  .sleep-day-date { font-size: 0.78rem; font-weight: 700; }
  .sleep-day-label, .sleep-seg-label { font-size: 0.55rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--gray-400); }
  .sleep-day-rule { height: 1px; background: var(--gray-200); margin: 0.8rem 0; }
  .sleep-day-rule.bottom { margin: 0.8rem 0 0.7rem; }
  .sleep-seg { display: flex; align-items: center; }
  .sleep-seg-col { flex: 1; }
  .sleep-seg-time { font-size: 1.15rem; font-weight: 700; margin-top: 0.2rem; font-variant-numeric: tabular-nums; }
  .sleep-seg-live { font-size: 0.8rem; font-weight: 600; color: var(--gray-400); }
  .sleep-seg-arrow { padding: 0 0.7rem; color: var(--gray-400); font-size: 0.9rem; }
  .sleep-awake { display: flex; align-items: center; gap: 0.4rem; margin: 0.55rem 0; font-size: 0.5rem; letter-spacing: 0.08em; color: var(--gray-400); }
  .sleep-awake-line { flex: 1; height: 1px; background: var(--gray-200); }
  .sleep-awake-line.short { flex: 0 0 24px; }
  .sleep-day-foot { display: flex; justify-content: space-between; align-items: center; }
  .sleep-day-total { font-size: 0.95rem; font-weight: 700; }

  /* ── LOADING ── */
  .loading-overlay { position: fixed; inset: 0; background: var(--white); display: flex; align-items: center; justify-content: center; z-index: 999; flex-direction: column; gap: 1rem; }
  .loading-overlay.hidden { display: none; }
  .loading-txt { font-size: 0.78rem; color: var(--gray-400); letter-spacing: 0.1em; animation: blink 1.2s infinite; }
  @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

  /* ── TOAST ── */
  .toasts { position: fixed; bottom: 1.5rem; right: 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; z-index: 1000; }
  .toast { background: var(--black); color: var(--white); font-family: var(--mono); font-size: 0.75rem; padding: 0.75rem 1.25rem; max-width: 300px; animation: tin 0.2s ease-out, tout 0.3s ease-in 2.7s forwards; }
  @keyframes tin { from{transform:translateX(100%);opacity:0} to{transform:translateX(0);opacity:1} }
  @keyframes tout { from{opacity:1} to{opacity:0;transform:translateX(100%)} }

  /* ── iPhone safe area ── */
  @supports (padding-bottom: env(safe-area-inset-bottom)) {
    #player-bar {
      padding-bottom: env(safe-area-inset-bottom);
      height: calc(68px + env(safe-area-inset-bottom));
    }
    body.player-open {
      padding-bottom: calc(68px + env(safe-area-inset-bottom));
    }
    .toasts {
      bottom: calc(1.5rem + env(safe-area-inset-bottom));
    }
  }



  /* ── PC CONTROL ── */
  #pc-control-page { padding: 2rem; max-width: 1100px; margin: 0 auto; }
  .pc-auth-box { border: 2px solid var(--black); padding: 2rem; max-width: 620px; margin: 0 auto; }
  .pc-auth-title { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.6rem; }
  .pc-auth-desc { font-family: var(--sans); font-size: 0.74rem; color: var(--gray-400); line-height: 1.7; margin-bottom: 1.25rem; }
  .pc-auth-row { margin-bottom: 0.5rem; }
  .pc-auth-error { min-height: 1.2em; font-size: 0.68rem; color: #c0392b; }
  .pc-control-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.75rem; }
  .pc-control-actions button { min-height: 38px; }
  .pc-control-message { border: var(--border); padding: 0.65rem 0.8rem; font-size: 0.7rem; color: var(--gray-600); margin-bottom: 1rem; }
  .pc-vnc-wrap { border: 2px solid var(--black); background: #111; position: relative; }
  .pc-vnc-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 0.65rem 0.8rem; color: var(--white); font-size: 0.62rem; letter-spacing: 0.1em; border-bottom: 1px solid #333; position: relative; z-index: 20; }
  .pc-vnc-head-right { display: flex; align-items: center; gap: 0.65rem; min-width: 0; }
  .pc-vnc-menu-btn { width: 30px; height: 30px; padding: 0; border: 1px solid #555; background: transparent; color: var(--white); font-family: var(--mono); font-size: 1rem; line-height: 1; cursor: pointer; }
  .pc-vnc-menu-btn:hover, .pc-vnc-menu-btn[aria-expanded="true"] { background: var(--white); color: #111; border-color: var(--white); }
  .pc-vnc-menu { position: absolute; right: 0.55rem; top: 2.9rem; width: min(310px, calc(100vw - 2.5rem)); background: #111; border: 1px solid #555; box-shadow: 0 12px 28px rgba(0,0,0,0.4); padding: 0.3rem; z-index: 100; }
  .pc-vnc-menu[hidden] { display: none; }
  .pc-vnc-menu button { display: block; width: 100%; border: 0; background: transparent; color: var(--white); padding: 0.7rem 0.75rem; text-align: left; font-family: var(--mono); font-size: 0.66rem; line-height: 1.35; cursor: pointer; }
  .pc-vnc-menu button:hover { background: #2a2a2a; }
  .pc-vnc-screen { min-height: 460px; height: min(68vh, 760px); overflow: auto; position: relative; background: #202020; overscroll-behavior: contain; touch-action: none; }
  .pc-vnc-screen canvas { display: block; }
  .pc-vnc-empty { position: absolute; inset: 0; display: grid; place-items: center; color: #999; font-size: 0.75rem; text-align: center; padding: 2rem; }
  .pc-keybar { display: flex; align-items: center; gap: 0.35rem; overflow-x: auto; overflow-y: hidden; padding: 0.45rem; background: #151515; border-top: 1px solid #333; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .pc-keybar::-webkit-scrollbar { display: none; }
  .pc-keybar[hidden] { display: none; }
  .pc-keybar button { flex: 0 0 auto; min-width: 38px; min-height: 34px; padding: 0.35rem 0.55rem; border: 1px solid #4a4a4a; background: #202020; color: #eee; font-family: var(--mono); font-size: 0.62rem; cursor: pointer; white-space: nowrap; }
  .pc-keybar button:hover, .pc-keybar button.active { background: #eee; color: #111; border-color: #eee; }
  .pc-keybar button:active { transform: translateY(1px); }
  @media (max-width: 768px) {
    #pc-control-page { padding: 1rem; }
    .pc-auth-box { padding: 1.2rem; }
    .pc-vnc-screen { min-height: 320px; height: 58vh; }
    .pc-vnc-menu { top: 2.7rem; }
  }

  /* ── SPOTIFY ── */
  #spotify-page { padding: 2rem; max-width: 960px; margin: 0 auto; }
  .sp-auth-box { border: 2px solid var(--black); padding: 2rem; text-align: center; margin-bottom: 2rem; }
  .sp-auth-title { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.5rem; }
  .sp-auth-desc { font-size: 0.72rem; color: var(--gray-400); margin-bottom: 1.25rem; }
  .sp-user-bar { display: flex; align-items: center; gap: 1rem; padding: 0.75rem 1rem; border: var(--border); margin-bottom: 1.5rem; background: var(--gray-100); }
  .sp-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; border: var(--border); flex-shrink: 0; }
  .sp-avatar-blank { width: 32px; height: 32px; border-radius: 50%; background: var(--gray-200); flex-shrink: 0; }
  .sp-username { font-size: 0.78rem; font-weight: 500; flex: 1; }
  .sp-search-row { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; }
  .sp-results-header { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--gray-400); margin-bottom: 0.75rem; padding-bottom: 0.5rem; border-bottom: var(--border); display: flex; justify-content: space-between; }
  .sp-track-list { display: flex; flex-direction: column; gap: 0; }
  .sp-track { display: flex; align-items: center; gap: 0.75rem; padding: 0.65rem 0.75rem; border-bottom: var(--border); font-size: 0.78rem; transition: background 0.1s; }
  .sp-track:hover { background: var(--gray-100); }
  .sp-track-img { width: 36px; height: 36px; object-fit: cover; flex-shrink: 0; border: var(--border); }
  .sp-track-info { flex: 1; min-width: 0; }
  .sp-track-name { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .sp-track-artist { font-size: 0.68rem; color: var(--gray-400); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 0.15rem; }
  .sp-track-pl { font-size: 0.65rem; color: var(--gray-600); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border: var(--border); padding: 0.1rem 0.4rem; max-width: 160px; flex-shrink: 0; }
  .sp-open-btn { background: none; border: var(--border); font-family: var(--mono); font-size: 0.65rem; padding: 0.2rem 0.55rem; cursor: pointer; color: var(--gray-600); letter-spacing: 0.04em; flex-shrink: 0; transition: all 0.15s; }
  .sp-open-btn:hover { background: var(--black); color: var(--white); border-color: var(--black); }
  .sp-empty { text-align: center; padding: 3rem; color: var(--gray-400); font-size: 0.75rem; border: var(--border); }
  .sp-loading { text-align: center; padding: 2rem; color: var(--gray-400); font-size: 0.72rem; letter-spacing: 0.08em; }
  .sp-playlist-filter { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
  .sp-pl-chip { background: none; border: var(--border); font-family: var(--mono); font-size: 0.65rem; padding: 0.2rem 0.6rem; cursor: pointer; color: var(--gray-600); letter-spacing: 0.04em; transition: all 0.1s; white-space: nowrap; }
  .sp-pl-chip.active { background: var(--black); color: var(--white); border-color: var(--black); }
  .sp-pl-chip:hover:not(.active) { background: var(--gray-100); }

  /* ── PUBLIC PLAYLIST ── */
  .sp-public-wrap { margin-bottom: 2rem; }
  .sp-public-header {
    display: flex; justify-content: space-between; align-items: center;
    padding-bottom: 0.75rem; border-bottom: 2px solid var(--black);
    margin-bottom: 0;
  }
  .sp-public-cover {
    width: 36px; height: 36px; border: var(--border); background: var(--gray-200);
    flex-shrink: 0; overflow: hidden;
  }
  .sp-public-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
  .sp-public-refresh {
    background: none; border: var(--border); font-family: var(--mono);
    font-size: 0.65rem; padding: 0.18rem 0.55rem; cursor: pointer;
    color: var(--gray-600); letter-spacing: 0.04em; transition: all 0.15s;
  }
  .sp-public-refresh:hover { background: var(--black); color: var(--white); border-color: var(--black); }

  ::-webkit-scrollbar { width: 4px; }
  ::-webkit-scrollbar-thumb { background: var(--gray-200); }
  ::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

  @media (max-width: 900px) {
    header {
      height: auto;
      min-height: 48px;
      padding: 0 1rem;
      flex-wrap: wrap;
      gap: 0;
    }
    .logo {
      border-right: none;
      padding-right: 0;
      min-height: 48px;
      font-size: 0.8rem;
    }
    nav {
      width: 100%;
      order: 3;
      overflow-x: auto;
      overflow-y: hidden;
      scrollbar-width: none;
      -ms-overflow-style: none;
      -webkit-overflow-scrolling: touch;
      border-top: 1px solid var(--gray-100);
    }
    nav::-webkit-scrollbar { display: none; }
    nav button {
      min-height: 44px;
      padding: 0 1.15rem;
      font-size: 0.72rem;
      flex-shrink: 0;
    }
    nav button:first-child {
      margin-left: 0;
      border-left: none;
    }
    .header-right {
      margin-left: auto;
      gap: 0.6rem;
      min-height: 48px;
      font-size: 0.65rem;
    }
    #fb-label { display: none; }
    #clock { letter-spacing: 0.03em; }
  }

  /* ── VINYL ── */
  #vinyl-page { padding: 2rem; max-width: 1100px; margin: 0 auto; padding-bottom: 100px; }
  .album-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 2rem; }
  .album-add-btn {
    width: 100%; aspect-ratio: 1; border: 2px dashed var(--gray-200); background: none;
    cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 0.5rem; color: var(--gray-400); font-family: var(--mono); font-size: 0.7rem;
    letter-spacing: 0.05em; text-transform: uppercase; transition: all 0.2s;
  }
  .album-add-btn:hover { border-color: var(--black); color: var(--black); background: var(--gray-100); }
  .album-add-icon { font-size: 2.4rem; line-height: 1; }

  .album-card { cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 0.6rem; }
  .album-card:hover .vinyl-disc { transform: translateY(-4px) scale(1.02); }
  .vinyl-wrap { position: relative; width: 100%; aspect-ratio: 1; }
  .vinyl-disc {
    width: 100%; height: 100%; border-radius: 50%; background: #111;
    box-shadow: 0 8px 24px rgba(0,0,0,0.35), inset 0 0 0 1px #2a2a2a;
    position: relative; overflow: hidden; transition: transform 0.3s ease;
  }
  .vinyl-disc.spinning { animation: spin 3s linear infinite !important; transform: none !important; }
  @keyframes spin { from{transform:rotate(0deg)} to{transform:rotate(360deg)} }
  .vinyl-grooves {
    position: absolute; inset: 0; border-radius: 50%;
    background: repeating-radial-gradient(circle at center,
      transparent 0px, transparent 4px,
      rgba(255,255,255,0.025) 4px, rgba(255,255,255,0.025) 5px);
  }
  .vinyl-label {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    width: 38%; height: 38%; border-radius: 50%; overflow: hidden;
    border: 2px solid #222; z-index: 1;
  }
  .vinyl-label img { width: 100%; height: 100%; object-fit: cover; }
  .vinyl-label-blank { width: 100%; height: 100%; background: #2a2a2a; }
  .vinyl-hole {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    width: 6%; height: 6%; border-radius: 50%; background: #050505;
    border: 1px solid #444; z-index: 2;
  }
  .album-title-text { font-size: 0.78rem; font-weight: 500; text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; }
  .album-track-count { font-size: 0.65rem; color: var(--gray-400); text-align: center; }

  /* ── MODAL ── */
  .modal-overlay {
    position: fixed; inset: 0; background: rgba(10,10,10,0.75);
    display: flex; align-items: center; justify-content: center;
    z-index: 600; padding: 1rem;
  }
  .modal-overlay.hidden { display: none; }
  .modal-box {
    background: var(--white); border: 2px solid var(--black);
    width: 100%; max-width: 540px; max-height: 90vh; overflow-y: auto; padding: 2rem;
  }
  .modal-title { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 1.5rem; padding-bottom: 0.75rem; border-bottom: 2px solid var(--black); display: flex; justify-content: space-between; align-items: center; }
  .modal-close { background: none; border: none; font-size: 1.2rem; cursor: pointer; color: var(--gray-400); line-height: 1; transition: color 0.1s; }
  .modal-close:hover { color: var(--black); }
  .modal-field { margin-bottom: 1.25rem; }
  .modal-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--gray-400); margin-bottom: 0.4rem; display: block; }
  .cover-upload-zone {
    width: 110px; height: 110px; border: 2px dashed var(--gray-200);
    cursor: pointer; display: flex; align-items: center; justify-content: center;
    overflow: hidden; position: relative; transition: border-color 0.15s; flex-shrink: 0;
  }
  .cover-upload-zone:hover { border-color: var(--black); }
  .cover-upload-zone img { width: 100%; height: 100%; object-fit: cover; display: none; }
  .cover-upload-hint { font-size: 0.65rem; color: var(--gray-400); text-align: center; padding: 0.5rem; line-height: 1.5; }
  .cover-row { display: flex; gap: 1rem; align-items: flex-start; }
  .cover-meta { flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }
  .track-list-editor { display: flex; flex-direction: column; gap: 0.5rem; max-height: 260px; overflow-y: auto; padding-right: 0.25rem; }
  .track-row { display: flex; gap: 0.5rem; align-items: center; }
  .track-num { font-size: 0.65rem; color: var(--gray-400); width: 1rem; flex-shrink: 0; text-align: right; }
  .track-title-input, .track-url-input {
    border: var(--border); background: transparent; font-family: var(--mono);
    font-size: 0.75rem; padding: 0.35rem 0.55rem; color: var(--black); outline: none;
  }
  .track-title-input { width: 36%; min-width: 0; }
  .track-url-input  { flex: 1; min-width: 0; }
  .track-title-input:focus, .track-url-input:focus { border-width: 2px; }
  .btn-rm-track { background: none; border: none; font-size: 0.9rem; cursor: pointer; color: var(--gray-200); padding: 0; line-height: 1; transition: color 0.1s; flex-shrink: 0; }
  .btn-rm-track:hover { color: #c0392b; }
  .btn-add-track { background: none; border: var(--border); font-family: var(--mono); font-size: 0.7rem; padding: 0.35rem 0.75rem; cursor: pointer; color: var(--gray-600); letter-spacing: 0.05em; transition: all 0.15s; margin-top: 0.25rem; align-self: flex-start; }
  .btn-add-track:hover { background: var(--black); color: var(--white); border-color: var(--black); }
  .modal-actions { display: flex; gap: 0.75rem; margin-top: 1.5rem; padding-top: 1rem; border-top: var(--border); justify-content: flex-end; }
  .modal-del-btn { margin-right: auto; background: none; border: var(--border); font-family: var(--mono); font-size: 0.72rem; padding: 0.45rem 0.9rem; cursor: pointer; color: var(--gray-600); letter-spacing: 0.05em; transition: all 0.15s; }
  .modal-del-btn:hover { background: #c0392b; border-color: #c0392b; color: var(--white); }

  /* ── PLAYER BAR ── */
  #player-bar {
    position: fixed; bottom: 0; left: 0; right: 0; height: 68px;
    background: var(--black); color: var(--white); border-top: 2px solid #333;
    display: none; align-items: center; padding: 0 2rem; gap: 1.25rem;
    z-index: 500; font-family: var(--mono);
  }
  #player-bar.visible { display: flex; }
  #yt-player-shell {
    position: fixed;
    right: 1rem;
    bottom: 84px;
    width: 480px;
    height: 270px;
    background: var(--black);
    border: 2px solid var(--black);
    display: none;
    z-index: 490;
  }
  #yt-player-shell.visible { display: block; }
  #yt-player-holder,
  #yt-player-holder iframe {
    display: block;
    width: 100%;
    height: 100%;
  }
  body.player-open { padding-bottom: 68px; }
  .player-thumb {
    width: 40px; height: 40px; border-radius: 50%; object-fit: cover;
    border: 1px solid #333; flex-shrink: 0; animation: none;
  }
  .player-thumb.spinning { animation: spin 3s linear infinite; }
  .player-info { flex: 1; min-width: 0; }
  .player-album-name { font-size: 0.62rem; color: #666; text-transform: uppercase; letter-spacing: 0.08em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .player-track-name { font-size: 0.8rem; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 0.1rem; }
  .player-controls { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
  .ctrl-btn {
    background: none; border: 1px solid #444; color: var(--white);
    font-family: var(--mono); font-size: 0.65rem; padding: 0.28rem 0.55rem;
    cursor: pointer; letter-spacing: 0.04em; transition: all 0.15s; white-space: nowrap;
  }
  .ctrl-btn:hover { background: var(--white); color: var(--black); border-color: var(--white); }
  .ctrl-btn.active { background: var(--white); color: var(--black); border-color: var(--white); }
  .ctrl-btn.playing-btn { border-color: var(--white); }
  .player-track-pos { font-size: 0.65rem; color: #555; flex-shrink: 0; min-width: 60px; text-align: center; }

  /* ── VINYL RESPONSIVE ── */
  @media (max-width: 768px) {
    #vinyl-page { padding: 1rem; padding-bottom: 100px; }
    .album-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 1.25rem; }
    #player-bar { padding: 0 1rem; gap: 0.75rem; }
    #yt-player-shell {
      width: calc(100vw - 1.5rem);
      max-width: 360px;
      height: 203px;
      right: 0.75rem;
      bottom: 84px;
    }
    .player-track-pos { display: none; }
  }

  /* ── MOBILE BACK BUTTON (memo only) ── */
  .btn-back-mobile {
    display: none;
    background: none;
    border: none;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--gray-600);
    cursor: pointer;
    padding: 0;
    letter-spacing: 0.04em;
    align-items: center;
    gap: 0.3rem;
    flex-shrink: 0;
    white-space: nowrap;
  }
  .btn-back-mobile:hover { color: var(--black); }

  @media (max-width: 768px) {
    html { font-size: 13px; }

    /* ── Memo: full-panel switching ── */
    #memo-page {
      grid-template-columns: 1fr;
      grid-template-rows: auto minmax(0, 1fr);
      padding: 0;
      gap: 0;
      min-height: calc(100svh - 96px);
    }
    #memo-page .page-heading {
      padding: 0.75rem 1rem;
      margin-bottom: 0;
      border-bottom: 2px solid var(--black);
    }
    .memo-sidebar {
      height: calc(100svh - 144px);
      max-height: none;
      border-right: 2px solid var(--black);
      border-bottom: 2px solid var(--black);
      margin-bottom: 0;
    }
    /* Default on mobile: show list, hide editor */
    .memo-editor {
      display: none;
      height: calc(100svh - 144px);
    }
    /* When a note is open on mobile */
    #memo-page.editor-open .memo-sidebar { display: none; }
    #memo-page.editor-open .memo-editor  { display: flex; }

    .btn-back-mobile { display: inline-flex; }

    .editor-bar,
    .memo-content-area,
    .save-hint {
      padding-left: 1rem;
      padding-right: 1rem;
    }
    .editor-bar {
      flex-wrap: wrap;
      gap: 0.5rem;
      padding-top: 0.85rem;
      padding-bottom: 0.85rem;
    }
    .memo-title-input {
      width: 100%;
      min-width: 100%;
      order: 2;
      font-size: 1rem;
    }
    .btn-back-mobile { order: 1; }
    .editor-bar .btn-icon {
      order: 3;
      min-height: 40px;
      padding: 0.5rem 1rem;
    }
    .btn-new {
      min-height: 40px;
      font-size: 0.75rem;
    }
    .memo-item {
      padding: 1rem 1.1rem;
    }
    .memo-item-title { font-size: 0.85rem; }

    /* ── Pages padding ── */
    #p2p-page,
    #files-page,
    #sleep-page,
    #spotify-page {
      padding: 1rem;
    }

    /* ── P2P ── */
    .p2p-grid { grid-template-columns: 1fr; gap: 1rem; }
    .panel { padding: 1rem; }
    .page-heading {
      margin-bottom: 1rem;
      gap: 0.4rem;
      align-items: flex-start;
      flex-direction: column;
    }
    .input-row {
      flex-direction: column;
      gap: 0.5rem;
    }
    .input-row .btn-primary,
    .input-row .btn-secondary {
      width: 100%;
      min-height: 44px;
      font-size: 0.8rem;
    }
    .btn-primary, .btn-secondary {
      min-height: 44px;
    }
    .room-info {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.4rem;
    }
    .chat-area {
      height: 180px;
    }

    /* ── Files ── */
    .files-table,
    .files-table thead,
    .files-table tbody,
    .files-table tr,
    .files-table th,
    .files-table td {
      display: block;
      width: 100%;
    }
    .files-table thead {
      display: none;
    }
    .files-table tr {
      border: 2px solid var(--black);
      margin-bottom: 0.75rem;
    }
    .files-table td {
      border-bottom: var(--border);
      padding: 0.75rem 0.9rem;
    }
    .files-table td:last-child {
      border-bottom: none;
    }
    .files-table td::before {
      content: attr(data-label);
      display: block;
      margin-bottom: 0.3rem;
      font-size: 0.65rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--gray-400);
    }
    .fname {
      max-width: 100%;
      white-space: normal;
      word-break: break-word;
    }
    .factions {
      justify-content: flex-start;
      gap: 0.75rem;
    }
    .btn-dl, .btn-rm {
      min-height: 36px;
      padding: 0.4rem 0.85rem;
      font-size: 0.7rem;
    }
    .upload-zone {
      padding: 2rem 1.25rem;
    }
    .upload-icon { font-size: 2rem; }

    /* ── Sleep ── */
    #sleep-chart { height: 160px; }
    .sleep-chart-wrap { padding: 1rem; }
    .sleep-log-item { padding: 1rem; }
    .sleep-log-head {
      align-items: flex-start;
      flex-direction: column;
      gap: 0.75rem;
    }
    .sleep-actions {
      width: 100%;
    }
    .sleep-actions button {
      flex: 1;
      min-height: 44px;
    }

    /* ── Spotify ── */
    .sp-search-row { flex-direction: column; gap: 0.5rem; }
    .sp-search-row .btn-primary { width: 100%; min-height: 44px; }
    .sp-playlist-filter { gap: 0.4rem; }
    .sp-pl-chip { min-height: 34px; display: flex; align-items: center; }
    .sp-track { gap: 0.6rem; padding: 0.6rem; }
    .sp-track-pl { display: none; }

    /* ── Toast ── */
    .toasts {
      left: 1rem;
      right: 1rem;
      bottom: 1rem;
    }
    .toast {
      max-width: none;
    }
  }


  /* ═══ UX 보강 ═══════════════════════════════════════════ */
  html { -webkit-text-size-adjust: 100%; }

  /* 키보드 포커스 표시 (마우스 클릭에는 나타나지 않음) */
  :focus-visible { outline: 2px solid var(--black); outline-offset: 2px; }
  .memo-item:focus-visible { outline-offset: -2px; }
  /* 이미 굵은 테두리로 포커스를 보여주는 입력창은 이중 표시 방지 */
  .input-field:focus-visible,
  .memo-title-input:focus-visible,
  .memo-content-area:focus-visible,
  .track-title-input:focus-visible,
  .track-url-input:focus-visible,
  .memo-search:focus-visible { outline: none; }

  button:disabled { cursor: not-allowed; }

  /* 메모 검색 */
  .sidebar-top { gap: 0.75rem; }
  .memo-search {
    flex: 1; min-width: 0; min-height: 36px;
    border: var(--border); background: transparent;
    font-family: var(--mono); font-size: 0.75rem; color: var(--black);
    padding: 0.4rem 0.6rem; outline: none;
  }
  .memo-search:focus { border-width: 2px; padding: calc(0.4rem - 1px) calc(0.6rem - 1px); }
  .memo-search::placeholder { color: var(--gray-400); }
  .memo-list-msg { padding: 2rem; text-align: center; color: var(--gray-400); font-size: 0.75rem; line-height: 1.7; }

  /* 저장 실패는 사라지지 않고 빨갛게 유지 */
  .save-hint.err { color: #c0392b; opacity: 1; }

  /* 업로드 영역: 키보드로 접근했을 때도 표시 */
  .upload-zone:focus-within { background: var(--gray-100); outline: 2px solid var(--black); outline-offset: 2px; }

  /* 모션 최소화 설정을 존중 */
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }

  /* iOS Safari 는 16px 미만 입력창에 포커스하면 화면이 멋대로 확대된다 */
  @media (max-width: 768px) {
    .memo-title-input,
    .memo-content-area,
    .track-title-input,
    .track-url-input { font-size: 16px; }

    /* Room ID / Search notes 입력창: 안드로이드 등은 작게, placeholder 는 모든 기기에서 작게 */
    .input-field,
    .memo-search { font-size: 12px; }
    .input-field::placeholder,
    .memo-search::placeholder { font-size: 11px; }
  }
  /* iOS Safari 만 16px 유지 (입력한 글자 기준. placeholder 는 위에서 작게 유지됨) */
  @supports (-webkit-touch-callout: none) {
    @media (max-width: 768px) {
      .input-field,
      .memo-search { font-size: 16px; }
    }
  }