:root {
  --bg: #0f1115; --card: #1a1d24; --card2: #232731; --text: #e8eaf0; --muted: #8a90a0;
  --accent: #4f8cff; --accent2: #3b6fd6; --danger: #e5484d; --ok: #30a46c; --border: #2b303b;
}
@media (prefers-color-scheme: light) {
  :root { --bg: #f4f5f8; --card: #fff; --card2: #eef0f4; --text: #161a22; --muted: #687083; --border: #dde1e8; }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
body { padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom); }
.hidden { display: none !important; }
button, .file-btn { font: inherit; color: var(--text); background: var(--card2); border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 14px; cursor: pointer; }
button:active, .file-btn:active { transform: scale(.98); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { background: transparent; color: var(--danger); border-color: var(--danger); }
button.icon { background: none; border: none; font-size: 20px; padding: 6px; }
input[type=text], input[type=password], textarea {
  width: 100%; font: inherit; color: var(--text); background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 12px; outline: none; }
input:focus, textarea:focus { border-color: var(--accent); }
code { font-family: ui-monospace, Menlo, monospace; font-size: 13px; }

.screen { max-width: 640px; margin: 0 auto; padding: 12px 16px 40px; }
.login-box { margin-top: 18vh; text-align: center; }
.login-box .logo { font-size: 56px; }
.login-box form { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.err { color: var(--danger); min-height: 1.4em; }

header { display: flex; align-items: center; gap: 10px; margin: 4px 0 14px; }
header h1 { font-size: 22px; margin: 0; flex: 1; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--muted); }
.dot.on { background: var(--ok); box-shadow: 0 0 8px var(--ok); }
.dot.off { background: var(--danger); }

.actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.big { padding: 18px 10px; font-size: 16px; font-weight: 600; border-radius: 16px; }
.compose { margin: 14px 0 18px; }
.compose textarea { resize: vertical; min-height: 48px; }
.compose-row { display: flex; justify-content: space-between; margin-top: 8px; gap: 8px; }

#list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.item { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 12px; }
.item.new { animation: flash 1.2s ease; }
@keyframes flash { from { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent); } }
.item .meta { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.item .text { white-space: pre-wrap; word-break: break-word; max-height: 9.8em; overflow: hidden; cursor: pointer; }
.item .text.open { max-height: none; }
.item .text a { color: var(--accent); }
.item img { display: block; max-width: 100%; max-height: 320px; border-radius: 10px; margin: 0 auto; cursor: pointer; background: var(--card2); }
.item .btns { display: flex; gap: 8px; margin-top: 10px; }
.item .btns button { padding: 7px 12px; font-size: 14px; }
.item .btns .copy { flex: 1; }
.muted { color: var(--muted); text-align: center; }

.sheet { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 10; overflow-y: auto; }
.sheet-inner { background: var(--bg); max-width: 640px; margin: 0 auto; min-height: 100%; padding: 16px 16px 60px;
  padding-top: calc(16px + env(safe-area-inset-top)); }
.sheet-head { display: flex; justify-content: space-between; align-items: center; }
.sheet h2 { margin: 0; } .sheet h3 { margin: 26px 0 6px; }
.sheet p { margin: 6px 0; }
.field { display: block; margin: 14px 0; } .field input { margin-top: 6px; }
.toggle { display: flex; gap: 10px; align-items: flex-start; margin: 12px 0; }
.toggle input { width: 20px; height: 20px; flex: none; margin-top: 1px; }
.tips { padding-left: 20px; margin: 6px 0; } .tips li { margin: 4px 0; }
.code { display: flex; gap: 8px; align-items: stretch; background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 8px; }
.code code { flex: 1; word-break: break-all; align-self: center; }
.code button { padding: 6px 10px; font-size: 13px; }
#clearBtn, #logoutBtn { margin: 6px 6px 0 0; }

.toast { position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom)); transform: translateX(-50%);
  background: var(--card2); border: 1px solid var(--border); padding: 10px 16px; border-radius: 12px; z-index: 20;
  box-shadow: 0 6px 24px rgba(0,0,0,.3); max-width: calc(100% - 32px); }