:root {
  color-scheme: light;
  --paper: #fff9ec;
  --paper-strong: #fffdf7;
  --ink: #0d1b3d;
  --muted: #697692;
  --blue: #1764ef;
  --blue-dark: #0d4fd1;
  --mint: #19bda3;
  --mint-soft: #e2f7f1;
  --coral: #ff654f;
  --yellow: #ffc842;
  --violet: #7b63dc;
  --line: rgba(55, 71, 102, .16);
  --shadow: 0 18px 50px rgba(47, 78, 130, .12);
  --radius: 22px;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-synthesis: none;
  background: #eaf1fb;
  color: var(--ink);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  min-width: 320px;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 12% 8%, rgba(25,100,239,.08), transparent 24rem),
    radial-gradient(circle at 88% 86%, rgba(25,189,163,.09), transparent 26rem),
    #edf3fb;
}
button, input, textarea { font: inherit; }
button { cursor: pointer; }
button svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; vertical-align: middle; }
button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid rgba(23,100,239,.25); outline-offset: 2px; }
img { max-width: 100%; display: block; }

#app { min-height: 100dvh; }
.app-shell {
  width: min(100%, 1160px);
  min-height: 100dvh;
  margin: 0 auto;
  background: var(--paper);
  position: relative;
  overflow: hidden;
}
.paper {
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, rgba(93,73,33,.018) 1px, transparent 1px),
    linear-gradient(rgba(93,73,33,.014) 1px, transparent 1px);
  background-size: 5px 5px;
}
.desktop-frame { min-height: 100dvh; }
.screen { min-height: 100dvh; padding: max(20px, env(safe-area-inset-top)) 20px max(24px, env(safe-area-inset-bottom)); }
.screen-inner { width: min(100%, 780px); margin: 0 auto; }
.topbar { display: flex; align-items: center; gap: 14px; min-height: 54px; margin-bottom: 22px; }
.topbar h1 { font-size: clamp(28px, 5vw, 42px); margin: 0; letter-spacing: -.035em; }
.topbar-spacer { flex: 1; }
.icon-button {
  width: 44px; height: 44px; border: 0; border-radius: 14px; color: var(--ink); background: transparent;
  display: inline-grid; place-items: center; transition: background .18s ease, transform .18s ease;
}
.icon-button:hover { background: rgba(23,100,239,.07); transform: translateY(-1px); }
.icon-button svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.crayon-title {
  font-family: "Comic Sans MS", "Marker Felt", "Kaiti SC", cursive;
  font-weight: 900;
  letter-spacing: .035em;
  color: var(--blue);
  text-shadow: 1px 1px 0 var(--coral), -1px 0 var(--blue), 0 2px 0 rgba(25,100,239,.15);
  transform: rotate(-1deg);
}
.crayon-underline { height: 7px; border-radius: 50%; background: var(--coral); transform: rotate(-1deg); opacity: .9; }
.brand-lockup { text-align: center; margin: -8px 0 12px; }
.brand-lockup h1 { font-size: clamp(40px, 11vw, 66px); margin: 0; }
.brand-lockup strong { display: block; color: var(--mint); font: 900 21px/1.1 "Comic Sans MS", "Marker Felt", cursive; letter-spacing: .07em; margin-top: 2px; }
.brand-lockup p { color: var(--muted); margin: 10px 0 0; font-size: 15px; }
.hero-art { width: 100%; max-height: 310px; object-fit: cover; object-position: center 44%; border-radius: 0 0 38% 38% / 0 0 16% 16%; mix-blend-mode: multiply; }
.memory-note {
  position: absolute; top: 18px; right: 18px; max-width: 150px; padding: 10px 12px;
  background: rgba(255,249,236,.9); border: 2px solid #cbb993; transform: rotate(3deg);
  color: #3e3328; font: 800 14px/1.45 "Kaiti SC", cursive; box-shadow: 3px 3px 0 rgba(82,57,23,.08);
}
.auth-layout { display: grid; min-height: 100dvh; }
.auth-visual { position: relative; overflow: hidden; background: var(--paper); }
.auth-panel { padding: 18px 20px max(24px, env(safe-area-inset-bottom)); background: var(--paper); }
.tabs { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line); margin: 4px 0 18px; }
.tab { border: 0; background: transparent; color: var(--muted); padding: 12px 8px; font-weight: 750; position: relative; }
.tab.active { color: var(--blue); }
.tab.active::after { content: ""; position: absolute; left: 20%; right: 20%; bottom: -2px; height: 4px; border-radius: 999px; background: var(--blue); transform: rotate(-1deg); }
.form-grid { display: grid; gap: 14px; }
.field { display: grid; gap: 7px; }
.field label { font-weight: 780; font-size: 14px; }
.input, .textarea {
  width: 100%; border: 1.5px solid var(--line); background: rgba(255,255,255,.74); color: var(--ink);
  border-radius: 14px; padding: 13px 14px; min-height: 48px; box-shadow: inset 0 1px 0 rgba(255,255,255,.75);
}
.textarea { min-height: 96px; resize: vertical; }
.input::placeholder, .textarea::placeholder { color: #a3adc0; }
.helper { color: var(--muted); font-size: 12px; line-height: 1.5; }
.primary, .secondary, .danger, .ghost-button {
  border: 0; min-height: 49px; border-radius: 14px; padding: 11px 18px; font-weight: 800; transition: transform .18s ease, box-shadow .18s ease, opacity .18s ease;
}
.room-actions button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.primary { color: white; background: var(--blue); box-shadow: 0 10px 24px rgba(23,100,239,.22); }
.primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.secondary { color: #087d6c; background: var(--mint-soft); border: 1.5px solid rgba(25,189,163,.25); }
.danger { color: white; background: var(--coral); }
.ghost-button { color: var(--blue); background: transparent; }
button:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }
.privacy-copy { color: var(--muted); font-size: 12px; line-height: 1.65; text-align: center; margin: 18px auto 0; max-width: 560px; }

.avatar-picker { margin: 2px 0; }
.avatar-picker > span { display: block; font-weight: 780; font-size: 14px; margin-bottom: 9px; }
.avatar-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.avatar-choice { border: 2px solid transparent; padding: 2px; background: transparent; border-radius: 50%; aspect-ratio: 1; position: relative; }
.avatar-choice.selected { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(23,100,239,.12); }
.avatar-choice.selected::after { content: "✓"; position: absolute; right: -1px; bottom: -1px; width: 19px; height: 19px; border-radius: 50%; background: var(--blue); color: white; display: grid; place-items: center; font-size: 12px; font-weight: 900; }
.avatar, .avatar-choice span { display: block; border-radius: 50%; background-image: url('/assets/avatar-sprite.png'); background-repeat: no-repeat; background-size: 500% 200%; }
.avatar-choice span { width: 100%; height: 100%; }
.avatar { width: 42px; height: 42px; flex: 0 0 42px; }
.avatar[data-avatar="0"], [data-avatar-choice="0"] span { background-position: 0% 0%; }
.avatar[data-avatar="1"], [data-avatar-choice="1"] span { background-position: 25% 0%; }
.avatar[data-avatar="2"], [data-avatar-choice="2"] span { background-position: 50% 0%; }
.avatar[data-avatar="3"], [data-avatar-choice="3"] span { background-position: 75% 0%; }
.avatar[data-avatar="4"], [data-avatar-choice="4"] span { background-position: 100% 0%; }
.avatar[data-avatar="5"], [data-avatar-choice="5"] span { background-position: 0% 100%; }
.avatar[data-avatar="6"], [data-avatar-choice="6"] span { background-position: 25% 100%; }
.avatar[data-avatar="7"], [data-avatar-choice="7"] span { background-position: 50% 100%; }
.avatar[data-avatar="8"], [data-avatar-choice="8"] span { background-position: 75% 100%; }
.avatar[data-avatar="9"], [data-avatar-choice="9"] span { background-position: 100% 100%; }

.mode-badge { display: inline-flex; align-items: center; gap: 7px; color: #7c5f0f; background: #fff4c9; border: 1px solid #f0d76e; border-radius: 999px; padding: 6px 10px; font-size: 12px; }
.room-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 20px; }
.room-list { display: grid; gap: 10px; }
.room-row {
  width: 100%; display: grid; grid-template-columns: 6px 1fr auto; gap: 14px; align-items: center; text-align: left;
  padding: 16px 15px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.72); color: inherit;
  box-shadow: 0 7px 20px rgba(47,78,130,.06); transition: transform .18s ease, border-color .18s ease;
}
.room-row:hover { transform: translateY(-2px); border-color: rgba(23,100,239,.28); }
.room-stroke { width: 6px; height: 58px; border-radius: 50%; background: var(--blue); transform: rotate(-1deg); }
.room-row:nth-child(4n+2) .room-stroke { background: var(--yellow); }
.room-row:nth-child(4n+3) .room-stroke { background: var(--mint); }
.room-row:nth-child(4n+4) .room-stroke { background: var(--violet); }
.room-main strong { font-size: 17px; display: block; }
.room-main small, .room-main p { color: var(--muted); margin: 4px 0 0; font-size: 13px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; max-width: min(65vw, 500px); }
.room-meta { align-self: stretch; display: flex; flex-direction: column; align-items: flex-end; justify-content: space-between; color: var(--muted); font-size: 12px; }
.unread { background: var(--coral); color: white; min-width: 23px; height: 23px; padding: 0 6px; border-radius: 999px; display: grid; place-items: center; font-weight: 800; }
.empty { padding: 56px 18px; text-align: center; color: var(--muted); border: 2px dashed rgba(23,100,239,.17); border-radius: var(--radius); }
.empty strong { color: var(--ink); display: block; font-size: 20px; margin-bottom: 6px; }

.segmented { display: grid; grid-template-columns: 1fr 1fr; padding: 4px; background: rgba(102,117,145,.08); border-radius: 16px; margin-bottom: 24px; }
.segmented button { border: 0; border-radius: 13px; padding: 12px; background: transparent; color: var(--muted); font-weight: 800; }
.segmented button.active { color: white; background: var(--blue); box-shadow: 0 6px 16px rgba(23,100,239,.2); }
.safety-note { display: flex; gap: 10px; padding: 14px; margin-top: 20px; color: #087d6c; background: var(--mint-soft); border-radius: 16px; font-size: 13px; line-height: 1.55; }
.safety-note svg { flex: 0 0 22px; width: 22px; height: 22px; }

.chat-screen { display: grid; grid-template-rows: auto auto 1fr auto; height: 100dvh; padding: max(10px, env(safe-area-inset-top)) 0 max(8px, env(safe-area-inset-bottom)); }
.chat-topbar { padding: 0 12px; margin: 0; }
.chat-heading { text-align: center; flex: 1; }
.chat-heading h1 { font-size: 20px; margin: 0; }
.chat-heading small { color: var(--muted); }
.expiry-banner { justify-self: center; color: var(--muted); background: rgba(99,117,147,.08); border-radius: 999px; padding: 8px 14px; font-size: 12px; margin-bottom: 8px; }
.messages { overflow-y: auto; padding: 12px 18px 22px; scroll-behavior: smooth; overscroll-behavior: contain; }
.message { display: flex; gap: 9px; align-items: flex-start; margin: 15px 0; }
.message.mine { flex-direction: row-reverse; }
.message-content { max-width: min(78%, 560px); }
.message-name { color: var(--muted); font-size: 12px; margin: 0 0 5px 4px; }
.message.mine .message-name { text-align: right; margin-right: 4px; }
.bubble { border: 1px solid var(--line); background: rgba(255,255,255,.82); border-radius: 16px; padding: 10px 12px; line-height: 1.55; overflow-wrap: anywhere; }
.message.mine .bubble { color: white; background: var(--blue); border-color: var(--blue); }
.message-time { display: block; font-size: 10px; color: #8994aa; text-align: right; margin-top: 4px; }
.message.mine .message-time { color: rgba(255,255,255,.7); }
.message-photo { width: min(100%, 420px); border-radius: 17px; cursor: zoom-in; border: 1px solid var(--line); }
.link-card { display: grid; gap: 6px; text-decoration: none; color: inherit; }
.link-card strong { font-size: 14px; }
.link-card span { font-size: 12px; opacity: .7; }
.composer { display: grid; grid-template-columns: auto auto 1fr auto; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--line); background: rgba(255,249,236,.96); backdrop-filter: blur(12px); }
.composer .input { min-height: 44px; padding: 10px 12px; }
.composer .icon-button { width: 42px; height: 42px; }
.send { width: 44px; height: 44px; border: 0; border-radius: 14px; background: var(--blue); color: white; display: grid; place-items: center; }
.send svg { width: 22px; }

.settings-list, .member-list { display: grid; gap: 1px; border: 1px solid var(--line); background: var(--line); border-radius: 18px; overflow: hidden; }
.settings-row, .member-row { min-height: 58px; border: 0; background: rgba(255,255,255,.9); padding: 12px 14px; color: inherit; display: flex; align-items: center; gap: 12px; text-align: left; }
.settings-row span:nth-child(2), .member-row strong { flex: 1; }
.settings-row small, .member-row small { color: var(--muted); }
.creator-tag { color: var(--mint); font-size: 12px; font-weight: 800; }
.danger-zone { margin-top: 22px; }
.danger-zone h2 { font-size: 14px; color: var(--muted); }

.image-viewer { min-height: 100dvh; background: #15191f; color: white; padding: max(16px, env(safe-area-inset-top)) 18px max(18px, env(safe-area-inset-bottom)); display: grid; grid-template-rows: auto 1fr auto; }
.image-viewer header { display: grid; grid-template-columns: 44px 1fr 44px; text-align: center; align-items: center; }
.image-viewer header small { color: #aab2be; }
.image-stage { display: grid; place-items: center; padding: 24px 0; }
.image-stage img { max-height: 70dvh; border-radius: 18px; object-fit: contain; }
.image-viewer footer { display: grid; gap: 10px; text-align: center; color: #aab2be; font-size: 12px; }
.image-viewer footer button { background: #2b3038; color: white; }
.image-viewer footer svg { width: 16px; height: 16px; fill: none; stroke: var(--mint); stroke-width: 2; vertical-align: -3px; }

.modal-backdrop { position: fixed; inset: 0; z-index: 20; display: grid; place-items: end center; background: rgba(13,27,61,.35); padding: 18px; }
.modal { width: min(100%, 520px); background: var(--paper); border-radius: 24px; padding: 22px; box-shadow: var(--shadow); }
.modal h2 { margin: 0 0 8px; }
.modal p { color: var(--muted); line-height: 1.6; }
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
.toast { position: fixed; z-index: 40; left: 50%; bottom: max(24px, env(safe-area-inset-bottom)); transform: translate(-50%, 20px); max-width: min(90vw, 520px); padding: 11px 16px; border-radius: 999px; background: var(--ink); color: white; box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: .24s ease; text-align: center; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (min-width: 820px) {
  .app-shell { min-height: calc(100dvh - 48px); margin: 24px auto; border-radius: 30px; box-shadow: var(--shadow); }
  .desktop-frame { min-height: calc(100dvh - 48px); }
  .screen { min-height: calc(100dvh - 48px); padding: 34px; }
  .auth-layout { grid-template-columns: minmax(360px, .92fr) minmax(420px, 1.08fr); min-height: calc(100dvh - 48px); }
  .auth-visual { display: grid; align-content: center; padding: 20px; border-right: 1px solid var(--line); }
  .auth-panel { display: grid; align-content: center; padding: 36px clamp(34px, 6vw, 72px); }
  .hero-art { max-height: none; border-radius: 30px; }
  .brand-lockup { margin-top: 24px; }
  .chat-screen { height: calc(100dvh - 48px); }
}

@media (max-width: 819px) {
  .auth-visual { height: min(38dvh, 330px); }
  .auth-visual .brand-lockup { display: none; }
  .auth-panel .mobile-brand { display: block; }
  .hero-art { height: 100%; }
  .memory-note { font-size: 12px; max-width: 124px; }
}
@media (min-width: 820px) { .mobile-brand { display: none; } }

@media (max-width: 420px) {
  .screen { padding-left: 15px; padding-right: 15px; }
  .room-actions { gap: 8px; }
  .room-actions button { padding-inline: 8px; font-size: 14px; }
  .room-row { padding: 14px 12px; gap: 10px; }
  .avatar { width: 36px; height: 36px; flex-basis: 36px; }
  .message-content { max-width: 82%; }
  .composer { grid-template-columns: auto 1fr auto; }
  .composer .emoji-trigger { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}