/* ============ ChatExpress - Design System ============ */
:root {
  --bg-void: #06070d;
  --bg-panel: rgba(18, 20, 32, 0.72);
  --bg-panel-solid: #12141f;
  --bg-elevated: rgba(28, 31, 46, 0.9);
  --border-soft: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text-primary: #f5f6fa;
  --text-secondary: #9497ab;
  --text-tertiary: #64667a;
  --accent-a: #7c5cff;
  --accent-b: #ff5cad;
  --accent-c: #5ce1ff;
  --success: #34d399;
  --danger: #f87171;
  --gradient-brand: linear-gradient(135deg, #7c5cff 0%, #ff5cad 100%);
  --gradient-brand-2: linear-gradient(135deg, #5ce1ff 0%, #7c5cff 100%);
  --shadow-glow: 0 8px 32px rgba(124, 92, 255, 0.25);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html, body {
  height: 100%;
  background: var(--bg-void);
  color: var(--text-primary);
  font-family: 'Noto Sans JP', 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; color: inherit; }
a { color: var(--accent-c); text-decoration: none; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }
::-webkit-scrollbar-track { background: transparent; }

/* ============ Background orbs (ambient animation) ============ */
#bg-orbs {
  position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none;
}
.orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.35;
  animation: float-orb 22s ease-in-out infinite;
}
.orb-1 { width: 480px; height: 480px; background: #7c5cff; top: -120px; left: -100px; animation-duration: 26s; }
.orb-2 { width: 420px; height: 420px; background: #ff5cad; bottom: -140px; right: -80px; animation-duration: 30s; animation-delay: -6s; }
.orb-3 { width: 360px; height: 360px; background: #5ce1ff; top: 40%; left: 60%; animation-duration: 34s; animation-delay: -12s; }
@keyframes float-orb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, -40px) scale(1.15); }
  66% { transform: translate(-40px, 50px) scale(0.9); }
}

/* ============ Toast ============ */
#toast-container {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  z-index: 9999; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  padding: 12px 20px; border-radius: var(--radius-sm);
  background: var(--bg-elevated); border: 1px solid var(--border-strong);
  backdrop-filter: blur(20px); font-size: 14px; font-weight: 500;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  animation: toast-in 0.4s var(--ease-spring);
  display: flex; align-items: center; gap: 10px;
}
.toast.success { border-color: rgba(52, 211, 153, 0.4); }
.toast.error { border-color: rgba(248, 113, 113, 0.4); }
.toast.leaving { animation: toast-out 0.3s ease forwards; }
@keyframes toast-in { from { opacity: 0; transform: translateY(-20px) scale(0.9); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(-10px) scale(0.9); } }

/* ============ Auth Screen ============ */
.auth-screen {
  position: relative; z-index: 1; height: 100vh; width: 100vw;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.auth-card {
  position: relative; width: 100%; max-width: 420px;
  background: var(--bg-panel); border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg); padding: 40px 32px;
  backdrop-filter: blur(24px);
  box-shadow: 0 30px 80px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.05);
  animation: card-rise 0.7s var(--ease-smooth);
}
@keyframes card-rise { from { opacity: 0; transform: translateY(30px) scale(0.96); } to { opacity: 1; transform: translateY(0) scale(1); } }

.auth-logo { text-align: center; margin-bottom: 28px; }
.logo-icon {
  width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 20px;
  background: var(--gradient-brand); display: flex; align-items: center; justify-content: center;
  font-size: 28px; box-shadow: var(--shadow-glow);
  animation: logo-pulse 3s ease-in-out infinite;
}
@keyframes logo-pulse {
  0%, 100% { box-shadow: 0 0 30px rgba(124,92,255,0.4); transform: rotate(0deg); }
  50% { box-shadow: 0 0 50px rgba(255,92,173,0.5); transform: rotate(3deg); }
}
.auth-logo h1 { font-family: 'Manrope', sans-serif; font-size: 28px; font-weight: 800; letter-spacing: -0.5px; }
.auth-logo h1 span {
  background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.auth-tagline { color: var(--text-tertiary); font-size: 13px; margin-top: 6px; }

.auth-tabs {
  display: flex; background: rgba(255,255,255,0.04); border-radius: var(--radius-sm);
  padding: 4px; margin-bottom: 24px; position: relative;
}
.auth-tab {
  flex: 1; padding: 10px; border-radius: 10px; font-weight: 600; font-size: 14px;
  color: var(--text-secondary); transition: color 0.3s;
  position: relative; z-index: 1;
}
.auth-tab.active { color: #fff; }
.auth-tabs::before {
  content: ''; position: absolute; top: 4px; left: 4px; width: calc(50% - 4px); height: calc(100% - 8px);
  background: var(--gradient-brand); border-radius: 10px; transition: transform 0.35s var(--ease-spring);
  box-shadow: 0 4px 16px rgba(124,92,255,0.4);
}
.auth-tabs.tab-register::before { transform: translateX(100%); }

.auth-form { display: none; flex-direction: column; gap: 14px; animation: form-fade 0.4s var(--ease-smooth); }
.auth-form.active { display: flex; }
@keyframes form-fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.input-group {
  display: flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm); padding: 13px 16px;
  transition: border-color 0.25s, background 0.25s, box-shadow 0.25s;
}
.input-group:focus-within {
  border-color: rgba(124,92,255,0.6); background: rgba(124,92,255,0.06);
  box-shadow: 0 0 0 3px rgba(124,92,255,0.12);
}
.input-group i:first-child { color: var(--text-tertiary); width: 16px; text-align: center; font-size: 14px; }
.input-group input, .input-group textarea {
  flex: 1; background: none; border: none; outline: none; font-size: 14.5px; color: var(--text-primary);
}
.input-group input::placeholder { color: var(--text-tertiary); }
.toggle-pw { color: var(--text-tertiary); padding: 4px; }
.toggle-pw:hover { color: var(--text-secondary); }

.terms-check { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); cursor: pointer; user-select: none; }
.terms-check input { width: 16px; height: 16px; accent-color: var(--accent-a); cursor: pointer; }

.btn-primary {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--gradient-brand); color: #fff; font-weight: 700; font-size: 15px;
  padding: 14px; border-radius: var(--radius-sm); margin-top: 6px;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s;
  box-shadow: 0 8px 24px rgba(124,92,255,0.3);
  position: relative; overflow: hidden;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(124,92,255,0.45); }
.btn-primary:active { transform: translateY(0) scale(0.98); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-primary i { transition: transform 0.25s; }
.btn-primary:hover i { transform: translateX(3px); }

.btn-logout {
  width: 100%; margin-top: 16px; padding: 12px; border-radius: var(--radius-sm);
  color: var(--danger); font-weight: 600; font-size: 14px; border: 1px solid rgba(248,113,113,0.25);
  display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: background 0.2s;
}
.btn-logout:hover { background: rgba(248,113,113,0.1); }

.form-error {
  color: var(--danger); font-size: 13px; text-align: center; min-height: 18px;
  animation: shake 0.4s;
}
.form-error:empty { display: none; }
@keyframes shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }

/* ============ App Screen ============ */
.app-screen {
  position: relative; z-index: 1; height: 100vh; display: none; overflow: hidden;
}
.app-screen.active { display: flex; }

.sidebar {
  width: 380px; min-width: 320px; height: 100%; display: flex; flex-direction: column;
  background: var(--bg-panel); border-right: 1px solid var(--border-soft);
  backdrop-filter: blur(24px);
}
.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 14px;
}
.brand { font-family: 'Manrope', sans-serif; font-weight: 800; font-size: 19px; display: flex; align-items: center; gap: 8px; }
.brand i { color: var(--accent-a); }
.icon-btn {
  width: 38px; height: 38px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); transition: background 0.2s, color 0.2s, transform 0.2s;
}
.icon-btn:hover { background: rgba(255,255,255,0.08); color: #fff; transform: rotate(15deg); }

.my-profile {
  display: flex; align-items: center; gap: 12px; padding: 12px 20px 18px; position: relative;
}
.avatar {
  width: 46px; height: 46px; border-radius: 16px; display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0; box-shadow: 0 4px 14px rgba(0,0,0,0.3);
  transition: transform 0.3s var(--ease-spring);
}
.my-profile:hover .avatar { transform: scale(1.08) rotate(-4deg); }
.my-profile-info { flex: 1; overflow: hidden; }
.my-name { font-weight: 700; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.my-id { font-size: 12px; color: var(--text-tertiary); }
.online-dot {
  width: 10px; height: 10px; border-radius: 50%; background: var(--success);
  box-shadow: 0 0 0 3px rgba(52,211,153,0.2);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot { 0%,100% { box-shadow: 0 0 0 3px rgba(52,211,153,0.2); } 50% { box-shadow: 0 0 0 6px rgba(52,211,153,0.08); } }

.sidebar-tabs { display: flex; gap: 4px; padding: 0 16px; margin-bottom: 12px; }
.sidebar-tab {
  flex: 1; padding: 9px; border-radius: 10px; font-size: 13px; font-weight: 600;
  color: var(--text-tertiary); display: flex; align-items: center; justify-content: center; gap: 6px;
  transition: background 0.25s, color 0.25s;
}
.sidebar-tab.active { background: rgba(124,92,255,0.14); color: var(--accent-a); }

.sidebar-actions { display: flex; gap: 8px; padding: 0 16px 14px; flex-wrap: wrap; }
.action-chip {
  flex: 1; min-width: 90px; padding: 9px 10px; border-radius: 12px; font-size: 12px; font-weight: 600;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border-soft); color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center; gap: 6px; white-space: nowrap;
  transition: all 0.25s var(--ease-smooth);
}
.action-chip:hover { background: rgba(124,92,255,0.12); border-color: rgba(124,92,255,0.35); color: #fff; transform: translateY(-2px); }
.action-chip i { color: var(--accent-a); }

.list-panel { flex: 1; overflow-y: auto; padding: 4px 10px 14px; display: none; }
.list-panel.active { display: block; }

.chat-item, .friend-item {
  display: flex; align-items: center; gap: 12px; padding: 12px; border-radius: 16px; margin-bottom: 4px;
  cursor: pointer; transition: background 0.2s, transform 0.2s; position: relative;
  animation: item-slide-in 0.4s var(--ease-smooth) backwards;
}
@keyframes item-slide-in { from { opacity: 0; transform: translateX(-14px); } to { opacity: 1; transform: translateX(0); } }
.chat-item:hover, .friend-item:hover { background: rgba(255,255,255,0.05); }
.chat-item.active { background: linear-gradient(135deg, rgba(124,92,255,0.18), rgba(255,92,173,0.1)); }
.chat-item .avatar, .friend-item .avatar { width: 48px; height: 48px; font-size: 21px; position: relative; }
.item-info { flex: 1; overflow: hidden; min-width: 0; }
.item-top { display: flex; justify-content: space-between; align-items: baseline; gap: 6px; }
.item-name { font-weight: 700; font-size: 14.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-time { font-size: 11px; color: var(--text-tertiary); flex-shrink: 0; }
.item-preview { font-size: 12.5px; color: var(--text-tertiary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 2px; }
.item-preview.deleted { font-style: italic; opacity: 0.7; }
.unread-badge {
  background: var(--gradient-brand); color: #fff; font-size: 11px; font-weight: 700;
  min-width: 20px; height: 20px; border-radius: 10px; display: flex; align-items: center; justify-content: center;
  padding: 0 6px; flex-shrink: 0; box-shadow: 0 2px 8px rgba(124,92,255,0.5);
  animation: badge-pop 0.4s var(--ease-spring);
}
@keyframes badge-pop { from { transform: scale(0); } to { transform: scale(1); } }
.presence-dot {
  position: absolute; bottom: -2px; right: -2px; width: 12px; height: 12px; border-radius: 50%;
  background: var(--success); border: 2px solid var(--bg-panel-solid);
}
.group-badge {
  position: absolute; bottom: -2px; right: -2px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent-c); display: flex; align-items: center; justify-content: center; font-size: 8px;
  border: 2px solid var(--bg-panel-solid); color: #06070d;
}
.empty-list-hint { text-align: center; color: var(--text-tertiary); font-size: 13px; padding: 40px 20px; }
.empty-list-hint i { font-size: 28px; display: block; margin-bottom: 10px; opacity: 0.5; }

/* ============ Chat Main ============ */
.chat-main { flex: 1; height: 100%; display: flex; flex-direction: column; position: relative; min-width: 0; }
.empty-state {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  padding: 40px;
}
.empty-icon {
  width: 96px; height: 96px; border-radius: 32px; background: rgba(124,92,255,0.08);
  display: flex; align-items: center; justify-content: center; font-size: 40px; color: var(--accent-a);
  margin-bottom: 20px; animation: float-icon 3.5s ease-in-out infinite;
}
@keyframes float-icon { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.empty-state h2 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.empty-state p { color: var(--text-tertiary); font-size: 14px; }

.chat-panel { flex: 1; display: none; flex-direction: column; height: 100%; min-width: 0; }
.chat-panel.active { display: flex; }

.chat-header {
  display: flex; align-items: center; gap: 12px; padding: 14px 20px;
  border-bottom: 1px solid var(--border-soft); background: rgba(10,11,18,0.4);
  backdrop-filter: blur(10px); flex-shrink: 0;
}
.mobile-only { display: none; }
.chat-header-avatar { width: 42px; height: 42px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 19px; }
.chat-header-info { flex: 1; overflow: hidden; }
.chat-header-name { font-weight: 700; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-header-status { font-size: 12px; color: var(--text-tertiary); }
.chat-header-status.online { color: var(--success); }

.messages-container { flex: 1; overflow-y: auto; padding: 20px 20px 8px; display: flex; flex-direction: column; }
.messages-list { display: flex; flex-direction: column; gap: 2px; margin-top: auto; }

.msg-row { display: flex; gap: 8px; margin: 6px 0; max-width: 100%; animation: msg-in 0.35s var(--ease-smooth); position: relative; }
@keyframes msg-in { from { opacity: 0; transform: translateY(10px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
.msg-row.mine { flex-direction: row-reverse; }
.msg-row .avatar-mini { width: 30px; height: 30px; border-radius: 10px; font-size: 14px; flex-shrink: 0; align-self: flex-end; }
.msg-row.mine .avatar-mini { display: none; }
.msg-row .msg-spacer { width: 30px; flex-shrink: 0; }

.msg-group { display: flex; flex-direction: column; max-width: 62%; gap: 3px; }
.msg-row.mine .msg-group { align-items: flex-end; }
.msg-sender-name { font-size: 11.5px; color: var(--text-tertiary); margin-left: 4px; margin-bottom: 1px; }

.bubble-wrap { display: flex; align-items: flex-end; gap: 6px; position: relative; }
.msg-row.mine .bubble-wrap { flex-direction: row-reverse; }

.bubble {
  padding: 10px 14px; border-radius: 18px; font-size: 14.5px; line-height: 1.5; word-wrap: break-word; white-space: pre-wrap;
  position: relative; max-width: 100%; transition: transform 0.15s;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.msg-row:not(.mine) .bubble { background: rgba(255,255,255,0.07); border: 1px solid var(--border-soft); border-bottom-left-radius: 6px; }
.msg-row.mine .bubble { background: var(--gradient-brand); color: #fff; border-bottom-right-radius: 6px; }
.bubble.deleted { background: rgba(255,255,255,0.03) !important; color: var(--text-tertiary) !important; font-style: italic; font-size: 13px; border: 1px dashed var(--border-soft) !important; }
.bubble.system { background: rgba(255,255,255,0.03) !important; color: var(--text-tertiary) !important; font-size: 12.5px; text-align: center; border-radius: 12px; margin: 4px auto; }
.bubble img.msg-image { max-width: 260px; max-height: 320px; border-radius: 14px; display: block; cursor: pointer; transition: transform 0.2s; }
.bubble img.msg-image:hover { transform: scale(1.02); }
.bubble .reply-quote {
  font-size: 12px; opacity: 0.75; border-left: 2px solid currentColor; padding-left: 8px; margin-bottom: 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px;
}

.msg-meta { display: flex; align-items: center; gap: 4px; font-size: 10.5px; color: var(--text-tertiary); margin-top: 1px; padding: 0 4px; }
.msg-row.mine .msg-meta { justify-content: flex-end; }
.read-check { color: var(--accent-c); }

.msg-actions {
  position: absolute; top: -34px; display: flex; gap: 2px; background: var(--bg-elevated); border: 1px solid var(--border-strong);
  border-radius: 12px; padding: 4px; opacity: 0; visibility: hidden; transition: opacity 0.2s, transform 0.2s; transform: translateY(4px) scale(0.9);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4); z-index: 5;
}
.msg-row.mine .msg-actions { right: 0; }
.msg-row:not(.mine) .msg-actions { left: 36px; }
.bubble-wrap:hover .msg-actions { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.msg-action-btn { width: 28px; height: 28px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--text-secondary); transition: background 0.15s, color 0.15s; }
.msg-action-btn:hover { background: rgba(255,255,255,0.1); color: #fff; }
.msg-action-btn.danger:hover { color: var(--danger); background: rgba(248,113,113,0.1); }

.reactions-row { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 2px; }
.reaction-chip {
  display: flex; align-items: center; gap: 3px; background: rgba(255,255,255,0.08); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 2px 7px; font-size: 12px; cursor: pointer; transition: transform 0.15s, background 0.15s;
  animation: badge-pop 0.3s var(--ease-spring);
}
.reaction-chip:hover { transform: scale(1.1); background: rgba(124,92,255,0.15); }
.reaction-chip.mine { background: rgba(124,92,255,0.25); border-color: rgba(124,92,255,0.5); }

.quick-react-popup {
  position: absolute; bottom: 100%; display: flex; gap: 3px; background: var(--bg-elevated); border: 1px solid var(--border-strong);
  border-radius: 20px; padding: 6px 8px; margin-bottom: 8px; box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  animation: popup-rise 0.25s var(--ease-spring); z-index: 10;
}
@keyframes popup-rise { from { opacity: 0; transform: translateY(6px) scale(0.9); } to { opacity: 1; transform: translateY(0) scale(1); } }
.quick-react-emoji { font-size: 19px; padding: 3px; border-radius: 50%; transition: transform 0.2s var(--ease-spring); }
.quick-react-emoji:hover { transform: scale(1.35) rotate(8deg); }

.date-divider { text-align: center; margin: 18px 0; position: relative; }
.date-divider span {
  background: rgba(255,255,255,0.06); color: var(--text-tertiary); font-size: 11.5px; font-weight: 600;
  padding: 5px 14px; border-radius: 10px;
}

/* Typing indicator */
.typing-indicator { display: none; align-items: flex-end; gap: 8px; padding: 4px 0 10px; }
.typing-indicator.active { display: flex; animation: msg-in 0.3s var(--ease-smooth); }
.typing-bubble {
  background: rgba(255,255,255,0.07); border: 1px solid var(--border-soft); border-radius: 18px; border-bottom-left-radius: 6px;
  padding: 12px 16px; display: flex; gap: 4px; align-items: center;
}
.typing-bubble span { width: 6px; height: 6px; border-radius: 50%; background: var(--text-secondary); animation: typing-dot 1.3s infinite; }
.typing-bubble span:nth-child(2) { animation-delay: 0.15s; }
.typing-bubble span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing-dot { 0%, 60%, 100% { transform: translateY(0); opacity: 0.4; } 30% { transform: translateY(-6px); opacity: 1; } }

/* Reply preview */
.reply-preview {
  display: none; align-items: center; justify-content: space-between; padding: 10px 20px;
  background: rgba(124,92,255,0.08); border-top: 1px solid var(--border-soft); font-size: 13px;
  animation: form-fade 0.25s var(--ease-smooth);
}
.reply-preview.active { display: flex; }
.reply-preview-content { display: flex; align-items: center; gap: 8px; color: var(--text-secondary); overflow: hidden; }
.reply-preview-content i { color: var(--accent-a); }
.reply-preview-content span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#reply-preview-close { color: var(--text-tertiary); padding: 4px; }

/* Message form */
.message-form {
  display: flex; align-items: flex-end; gap: 8px; padding: 14px 20px;
  border-top: 1px solid var(--border-soft); background: rgba(10,11,18,0.3); flex-shrink: 0;
}
.message-form textarea {
  flex: 1; background: rgba(255,255,255,0.05); border: 1px solid var(--border-soft); border-radius: 20px;
  padding: 11px 16px; font-size: 14.5px; resize: none; max-height: 120px; outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.message-form textarea:focus { border-color: rgba(124,92,255,0.5); background: rgba(124,92,255,0.05); }
.btn-send {
  width: 42px; height: 42px; border-radius: 14px; background: var(--gradient-brand); color: #fff;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: transform 0.2s var(--ease-spring), opacity 0.2s;
  box-shadow: 0 4px 14px rgba(124,92,255,0.35);
}
.btn-send:disabled { opacity: 0.35; box-shadow: none; }
.btn-send:not(:disabled):hover { transform: scale(1.08) rotate(-8deg); }
.btn-send:not(:disabled):active { transform: scale(0.94); }

.emoji-picker {
  display: none; position: absolute; bottom: 76px; left: 20px; width: 300px; max-height: 260px; overflow-y: auto;
  background: var(--bg-elevated); border: 1px solid var(--border-strong); border-radius: var(--radius-md);
  padding: 12px; grid-template-columns: repeat(7, 1fr); gap: 4px; box-shadow: 0 16px 40px rgba(0,0,0,0.5);
  animation: popup-rise 0.25s var(--ease-spring); z-index: 20;
}
.emoji-picker.active { display: grid; }
.emoji-picker button { font-size: 21px; padding: 6px; border-radius: 8px; transition: background 0.15s, transform 0.15s; }
.emoji-picker button:hover { background: rgba(124,92,255,0.15); transform: scale(1.2); }

/* ============ Modals ============ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(4,5,10,0.7); backdrop-filter: blur(6px);
  display: none; align-items: center; justify-content: center; z-index: 1000; padding: 20px;
  animation: overlay-fade 0.25s;
}
.modal-overlay.active { display: flex; }
@keyframes overlay-fade { from { opacity: 0; } to { opacity: 1; } }
.modal-box {
  background: var(--bg-panel-solid); border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  width: 100%; max-width: 420px; max-height: 85vh; overflow-y: auto;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6); animation: card-rise 0.35s var(--ease-spring);
}
.modal-terms { max-width: 480px; }
.modal-header {
  display: flex; align-items: center; justify-content: space-between; padding: 20px 22px;
  border-bottom: 1px solid var(--border-soft);
}
.modal-header h3 { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.modal-header h3 i { color: var(--accent-a); }
.modal-close { width: 32px; height: 32px; border-radius: 10px; display: flex; align-items: center; justify-content: center; color: var(--text-tertiary); transition: background 0.2s, color 0.2s; }
.modal-close:hover { background: rgba(255,255,255,0.08); color: #fff; }
.modal-body { padding: 22px; display: flex; flex-direction: column; gap: 14px; }
.modal-desc { font-size: 13.5px; color: var(--text-secondary); }
.terms-body p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 12px; }
.terms-body b { color: var(--text-primary); }
.modal-terms-close { margin: 0 22px 22px; }

.emoji-select-row, .color-select-row { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.emoji-select-btn {
  width: 44px; height: 44px; border-radius: 12px; background: rgba(255,255,255,0.05); border: 1px solid var(--border-soft);
  font-size: 20px; display: flex; align-items: center; justify-content: center; transition: all 0.2s var(--ease-spring);
}
.emoji-select-btn:hover { transform: scale(1.1); }
.emoji-select-btn.selected { background: rgba(124,92,255,0.2); border-color: var(--accent-a); transform: scale(1.1); }
.color-select-btn {
  width: 36px; height: 36px; border-radius: 50%; border: 2px solid transparent; transition: all 0.2s var(--ease-spring);
}
.color-select-btn.selected { border-color: #fff; transform: scale(1.15); box-shadow: 0 0 0 2px rgba(124,92,255,0.5); }

.settings-avatar-preview { display: flex; justify-content: center; margin-bottom: 4px; }
.settings-avatar-preview .avatar { width: 76px; height: 76px; font-size: 34px; border-radius: 22px; }

.group-code-display {
  display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 16px;
  background: rgba(124,92,255,0.1); border: 1px dashed rgba(124,92,255,0.4); border-radius: var(--radius-sm);
}
.group-code-display .code-text { font-family: monospace; font-size: 18px; font-weight: 700; letter-spacing: 2px; color: var(--accent-a); }
.copy-btn { padding: 8px 14px; background: rgba(255,255,255,0.08); border-radius: 10px; font-size: 12px; font-weight: 600; transition: background 0.2s; }
.copy-btn:hover { background: rgba(255,255,255,0.15); }

.info-member-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; }
.info-member-row .avatar { width: 38px; height: 38px; font-size: 17px; }
.info-member-row .member-name { flex: 1; font-size: 14px; font-weight: 600; }
.info-member-row .member-role { font-size: 11px; color: var(--text-tertiary); }
.section-label { font-size: 12px; font-weight: 700; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 6px; }
.danger-btn {
  width: 100%; padding: 12px; border-radius: var(--radius-sm); color: var(--danger); font-weight: 600; font-size: 14px;
  border: 1px solid rgba(248,113,113,0.25); transition: background 0.2s;
}
.danger-btn:hover { background: rgba(248,113,113,0.1); }

/* Image viewer */
.image-viewer { background: rgba(0,0,0,0.9); }
.image-viewer img { max-width: 90vw; max-height: 90vh; border-radius: 12px; animation: card-rise 0.3s var(--ease-spring); }
.image-viewer-close { position: absolute; top: 24px; right: 24px; width: 44px; height: 44px; background: rgba(255,255,255,0.1); border-radius: 50%; }

/* ============ Responsive ============ */
@media (max-width: 860px) {
  .sidebar { position: absolute; inset: 0; z-index: 5; width: 100%; transition: transform 0.35s var(--ease-smooth); }
  .sidebar.hide-mobile { transform: translateX(-100%); }
  .chat-main { width: 100%; }
  .mobile-only { display: flex; }
  .msg-group { max-width: 78%; }
}

/* Utility */
.hidden { display: none !important; }
.spin { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }