/* ═══════════════════════════════════════════════════════
   PAK ANONYMOUS AI — ULTRA PREMIUM CSS v5.4.0
   Full responsive: phones, tablets, foldables, desktops
═══════════════════════════════════════════════════════ */

/* ── DESIGN TOKENS ───────────────────────────────────── */
:root {
  --p: #00ffcc;
  --p-rgb: 0, 255, 204;
  --p-dim: rgba(0, 255, 204, 0.18);
  --p-glow: rgba(0, 255, 204, 0.45);
  --p-soft: rgba(0, 255, 204, 0.08);

  --bg: #030303;
  --bg-1: rgba(14, 14, 16, 0.7);
  --bg-2: rgba(20, 20, 24, 0.85);
  --bg-3: rgba(10, 10, 12, 0.6);

  --tx: #f2f2f2;
  --tx2: #a8a8b0;
  --tx3: #606068;

  --ok: #00e87a;
  --err: #ff3366;
  --warn: #ffaa00;

  --bdr: rgba(255, 255, 255, 0.07);
  --bdr2: rgba(255, 255, 255, 0.13);

  --f-ui: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --f-mono: 'Fira Code', 'Cascadia Code', ui-monospace, monospace;

  --r1: 8px;
  --r2: 14px;
  --r3: 20px;
  --r4: 28px;

  --blur1: blur(16px);
  --blur2: blur(28px);
  --blur3: blur(48px);

  --shadow-card: 0 8px 32px rgba(0,0,0,0.5), 0 2px 8px rgba(0,0,0,0.3);
  --shadow-float: 0 24px 64px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 24px var(--p-glow);
  --inset-light: inset 0 1px 0 rgba(255,255,255,0.06);

  /* iOS safe area insets */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);

  /* Sidebar width (fluid) */
  --sidebar-w: clamp(240px, 22vw, 300px);
}

[data-theme="hacker-green"]  { --p:#39ff14; --p-rgb:57,255,20;  --p-dim:rgba(57,255,20,0.18);  --p-glow:rgba(57,255,20,0.45);  --p-soft:rgba(57,255,20,0.08); }
[data-theme="crimson-ghost"] { --p:#ff003c; --p-rgb:255,0,60;   --p-dim:rgba(255,0,60,0.18);   --p-glow:rgba(255,0,60,0.45);   --p-soft:rgba(255,0,60,0.08); }
[data-theme="abyss-blue"]    { --p:#2b7fff; --p-rgb:43,127,255; --p-dim:rgba(43,127,255,0.18); --p-glow:rgba(43,127,255,0.45); --p-soft:rgba(43,127,255,0.08); }
[data-theme="neon-purple"]   { --p:#bf00ff; --p-rgb:191,0,255;  --p-dim:rgba(191,0,255,0.18);  --p-glow:rgba(191,0,255,0.45);  --p-soft:rgba(191,0,255,0.08); }

/* ── RESET ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html {
  height: 100%;
  /* Lock scroll at html level */
  overflow: hidden;
}

body {
  font-family: var(--f-ui);
  color: var(--tx);
  background: var(--bg);
  line-height: 1.6;
  height: 100%;
  /* Use dynamic viewport height — fixes iOS Chrome/Safari address bar */
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

::selection { background: var(--p-dim); color: #fff; }

/* ── KEYFRAME ANIMATIONS ─────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
  0%,100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(0.7); opacity: 0.4; }
}

@keyframes orbit {
  from { transform: rotate(0deg) translateX(4px) rotate(0deg); }
  to   { transform: rotate(360deg) translateX(4px) rotate(-360deg); }
}

@keyframes bounce3 {
  0%,80%,100% { transform: translateY(0);    opacity: 0.3; }
  40%          { transform: translateY(-6px); opacity: 1;   }
}

@keyframes glowPulse {
  0%,100% { box-shadow: 0 0 10px var(--p-glow); }
  50%      { box-shadow: 0 0 30px var(--p-glow), 0 0 60px var(--p-dim); }
}

@keyframes sendAnim {
  0%   { transform: scale(1) rotate(0deg); }
  40%  { transform: scale(0.85) rotate(-10deg); }
  70%  { transform: scale(1.1) rotate(5deg); }
  100% { transform: scale(1) rotate(0deg); }
}

/* ── BACKGROUND ──────────────────────────────────────── */
#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: #010101;
}

.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.09;
  transition: background 1.2s ease;
  will-change: transform;
}

.orb-1 { width: 55vw; height: 55vw; background: var(--p); top: -15vw; left: -10vw; animation: fadeIn 2s ease; }
.orb-2 { width: 45vw; height: 45vw; background: var(--ok); bottom: -10vw; right: -10vw; animation: fadeIn 2.5s ease; }
.orb-3 { width: 30vw; height: 30vw; background: var(--p); top: 40%; left: 40%; opacity: 0.05; }

/* ── MOBILE OVERLAY ───────────────────────────────────── */
.mobile-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.65);
  backdrop-filter: var(--blur1);
  -webkit-backdrop-filter: var(--blur1);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-overlay.active {
  opacity: 1;
  pointer-events: all;
}

/* ── APP LAYOUT ──────────────────────────────────────── */
.app-layout {
  display: flex;
  height: 100%;
  position: relative;
  z-index: 1;
}

/* ══════════════════════════════════════════════════════
   SIDEBAR
══════════════════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-1);
  backdrop-filter: var(--blur2);
  -webkit-backdrop-filter: var(--blur2);
  border-right: 1px solid var(--bdr);
  box-shadow: var(--inset-light), 4px 0 20px rgba(0,0,0,0.4);
  padding: clamp(16px, 2.5vw, 28px);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 300;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Sidebar scrollbar (always thin and invisible) */
.sidebar::-webkit-scrollbar { width: 0; }

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--bdr);
  margin-bottom: 24px;
  animation: fadeLeft 0.5s ease both;
}

.brand-icon {
  position: relative;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--p-soft);
  border: 1px solid var(--p-dim);
  border-radius: var(--r2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--p);
  box-shadow: var(--shadow-glow);
  animation: glowPulse 4s ease infinite;
}

.brand-pulse {
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--r2) + 3px);
  border: 1px solid var(--p-dim);
  animation: scaleIn 1s ease infinite alternate;
  pointer-events: none;
}

.brand-title {
  display: block;
  font-size: clamp(14px, 1.2vw, 17px);
  font-weight: 400;
  letter-spacing: 1.5px;
  color: var(--tx);
}
.brand-title strong { font-weight: 700; }

.brand-sub {
  display: block;
  font-size: 10px;
  color: var(--tx3);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: 2px;
}

/* Module Nav */
.module-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-grow: 1;
  animation: fadeLeft 0.5s 0.1s ease both;
}

.nav-label {
  display: block;
  font-size: 10px;
  color: var(--tx3);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 600;
  padding: 0 8px;
  margin-bottom: 8px;
}

.mod-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--r2);
  background: transparent;
  border: 1px solid transparent;
  color: var(--tx2);
  font-family: var(--f-ui);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
  text-align: left;
}

.mod-btn::after {
  content: '';
  position: absolute;
  left: 0; top: 12%; bottom: 12%;
  width: 3px;
  background: var(--p);
  border-radius: 0 4px 4px 0;
  opacity: 0;
  transition: opacity 0.25s;
}

.mod-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--r1);
  background: rgba(255,255,255,0.04);
  flex-shrink: 0;
  font-size: 15px;
  transition: all 0.25s;
}

.mod-label { flex-grow: 1; }

.mod-tag {
  font-size: 9px;
  color: var(--tx3);
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}

.mod-btn:hover {
  background: rgba(255,255,255,0.03);
  color: var(--tx);
  transform: translateX(3px);
}

.mod-btn.active {
  background: var(--p-soft);
  border-color: var(--p-dim);
  color: var(--tx);
  box-shadow: var(--shadow-card);
}
.mod-btn.active::after { opacity: 1; }
.mod-btn.active .mod-icon {
  background: var(--p-dim);
  color: var(--p);
  box-shadow: 0 0 12px var(--p-glow);
}
.mod-btn.active .mod-tag { color: var(--p); opacity: 0.7; }

/* Sidebar Footer */
.sidebar-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--bdr);
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: fadeLeft 0.5s 0.2s ease both;
}

.sys-status {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--bdr);
  padding: 10px 14px;
  border-radius: var(--r2);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 8px var(--ok);
  flex-shrink: 0;
  animation: pulse 2s ease infinite;
}
.status-dot.mini { width: 6px; height: 6px; }

.status-info { display: flex; flex-direction: column; gap: 1px; }
.status-label { font-size: 12px; color: var(--tx2); font-family: var(--f-mono); }
.status-model { font-size: 10px; color: var(--tx3); font-family: var(--f-mono); }

.theme-section { display: flex; flex-direction: column; gap: 10px; }

.theme-picker { display: flex; gap: 8px; }

.tsw {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.12);
  background: var(--c);
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0.55;
}
.tsw:hover { opacity: 0.85; transform: scale(1.15); }
.tsw.active { border-color: rgba(255,255,255,0.9); opacity: 1; transform: scale(1.15); box-shadow: 0 0 12px var(--c); }

.clear-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--bdr2);
  border-radius: var(--r2);
  color: var(--tx3);
  font-family: var(--f-ui);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.clear-btn:hover { border-color: var(--err); color: var(--err); background: rgba(255,51,102,0.05); }

/* ══════════════════════════════════════════════════════
   CHAT ARENA
══════════════════════════════════════════════════════ */
.chat-arena {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

/* Mobile Header (hidden on desktop) */
.mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  padding-top: calc(12px + var(--safe-top));
  background: var(--bg-1);
  backdrop-filter: var(--blur2);
  -webkit-backdrop-filter: var(--blur2);
  border-bottom: 1px solid var(--bdr);
  z-index: 100;
  flex-shrink: 0;
}

.mh-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--tx);
}
.mh-brand i { color: var(--p); font-size: 18px; text-shadow: 0 0 10px var(--p-glow); }
.mh-brand strong { font-weight: 700; }

.mh-actions { display: flex; align-items: center; gap: 12px; }

.mh-status {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: rgba(0,0,0,0.3);
  border-radius: 50%;
  border: 1px solid var(--bdr);
}

.mobile-menu-btn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--bdr2);
  border-radius: var(--r1);
  color: var(--tx);
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s;
}
.mobile-menu-btn:active { background: rgba(255,255,255,0.1); }

/* ── Chat History ─────────────────────────────────── */
.chat-history {
  flex-grow: 1;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  padding: clamp(20px, 4vw, 48px) clamp(16px, 5vw, 48px);
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 36px);
}

/* Thin custom scrollbar */
.chat-history::-webkit-scrollbar { width: 5px; }
.chat-history::-webkit-scrollbar-track { background: transparent; }
.chat-history::-webkit-scrollbar-thumb { background: var(--bdr2); border-radius: 10px; }

/* ── Messages ─────────────────────────────────────── */
.msg {
  display: flex;
  gap: clamp(10px, 2vw, 16px);
  width: 100%;
  animation: fadeUp 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
  /* Prevent text-overflow from expanding layout */
  min-width: 0;
}

/* AI: left-aligned */
.ai-msg { align-self: flex-start; max-width: min(780px, 88%); }

/* User: right-aligned */
.user-msg {
  align-self: flex-end;
  flex-direction: row-reverse;
  max-width: min(680px, 85%);
}

/* Avatar */
.msg-avatar {
  flex-shrink: 0;
  width: clamp(36px, 5vw, 44px);
  height: clamp(36px, 5vw, 44px);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(16px, 2.5vw, 20px);
}

.ai-msg .msg-avatar {
  background: var(--p-soft);
  border: 1px solid var(--p-dim);
  color: var(--p);
  box-shadow: 0 0 16px var(--p-glow);
}

.user-msg .msg-avatar {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--bdr2);
  color: var(--tx2);
}

/* Bubble container */
.msg-bubble {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.msg-meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 0 4px;
}
.user-msg .msg-meta { flex-direction: row-reverse; }

.msg-name { font-size: 13px; font-weight: 600; }
.ai-msg .msg-name { color: var(--p); text-shadow: 0 0 8px var(--p-glow); }
.user-msg .msg-name { color: var(--tx2); }

.msg-time { font-size: 11px; color: var(--tx3); font-family: var(--f-mono); }

/* Message text bubble */
.msg-text {
  padding: clamp(14px, 2.5vw, 20px) clamp(16px, 3vw, 24px);
  font-size: clamp(14px, 1.5vw, 15px);
  line-height: 1.75;
  color: var(--tx);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.ai-msg .msg-text {
  background: rgba(18, 18, 22, 0.96);
  border: 1px solid var(--bdr2);
  border-radius: 4px var(--r3) var(--r3) var(--r3);
  box-shadow: var(--shadow-card), var(--inset-light);
}

.user-msg .msg-text {
  background: var(--p-soft);
  border: 1px solid var(--p-dim);
  border-radius: var(--r3) 4px var(--r3) var(--r3);
}

.msg-text p { margin-bottom: 1em; }
.msg-text p:last-child { margin-bottom: 0; }

/* Rich text in messages */
.msg-text h2 { font-size: clamp(15px, 1.8vw, 18px); color: var(--p); margin: 20px 0 10px; }
.msg-text h3 { font-size: clamp(14px, 1.5vw, 16px); color: var(--p); margin: 16px 0 8px; }
.msg-text ul, .msg-text ol { margin: 10px 0 10px 20px; }
.msg-text li { margin-bottom: 6px; }
.msg-text li::marker { color: var(--p); }
.msg-text strong { color: var(--p); font-weight: 600; }
.msg-text em { color: var(--tx2); font-style: italic; }
.msg-text hr { border: none; border-top: 1px solid var(--bdr2); margin: 16px 0; }

.msg-text a { color: var(--p); text-decoration: underline; text-underline-offset: 3px; }
.msg-text a:hover { opacity: 0.8; }

/* Inline code */
.msg-text :not(pre) > code {
  font-family: var(--f-mono);
  font-size: 0.875em;
  background: rgba(255,255,255,0.08);
  padding: 2px 7px;
  border-radius: 5px;
  color: var(--tx);
  border: 1px solid var(--bdr2);
}

/* Code blocks */
.code-wrap {
  margin: 14px 0;
  border-radius: var(--r2);
  overflow: hidden;
  border: 1px solid var(--bdr2);
  background: #0a0a0c;
}

.code-hdr {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid var(--bdr);
}

.code-lang {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--p);
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--r1);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--bdr2);
  color: var(--tx2);
  font-family: var(--f-mono);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
}
.copy-btn:hover { background: rgba(255,255,255,0.1); color: var(--tx); }
.copy-btn.copied { color: var(--ok); border-color: var(--ok); background: rgba(0,232,122,0.08); }

.code-wrap pre {
  padding: clamp(12px, 2vw, 18px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.code-wrap pre::-webkit-scrollbar { height: 4px; }
.code-wrap pre::-webkit-scrollbar-thumb { background: var(--bdr2); border-radius: 4px; }

.code-wrap pre code {
  font-family: var(--f-mono);
  font-size: clamp(12px, 1.2vw, 13.5px);
  color: #c9d1d9;
  line-height: 1.6;
}

/* Syntax-like coloring */
.code-wrap .kw  { color: #ff79c6; }
.code-wrap .str { color: #50fa7b; }
.code-wrap .cm  { color: #6272a4; font-style: italic; }
.code-wrap .num { color: #bd93f9; }
.code-wrap .fn  { color: #8be9fd; }

/* Token usage row */
.msg-tokens {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--bdr);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--tx3);
}
.token-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(255,255,255,0.03);
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid var(--bdr);
}

/* Capability grid */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 20px 0 22px;
}

.cap-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--bdr2);
  border-radius: var(--r2);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--tx2);
  transition: all 0.2s;
}
.cap-card i { color: var(--p); font-size: 16px; }
.cap-card:hover { border-color: var(--p-dim); color: var(--tx); background: var(--p-soft); }

/* Suggested queries */
.suggested-queries {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

.sq-label {
  font-size: 11px;
  color: var(--tx3);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 4px;
}

.sq-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--bdr2);
  border-radius: var(--r2);
  color: var(--tx2);
  font-family: var(--f-ui);
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  word-break: break-word;
  overflow-wrap: anywhere;
}
.sq-btn i { color: var(--p); flex-shrink: 0; }
.sq-btn:hover {
  background: var(--p-soft);
  border-color: var(--p-dim);
  color: var(--tx);
  transform: translateX(5px);
}

/* Typing indicator */
.typing-wrap { padding: 6px 4px; display: flex; gap: 5px; }
.typing-wrap span {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--p);
  animation: bounce3 1.4s ease-in-out infinite;
}
.typing-wrap span:nth-child(2) { animation-delay: 0.18s; }
.typing-wrap span:nth-child(3) { animation-delay: 0.36s; }

/* Error bubble */
.err-msg .msg-avatar {
  background: rgba(255,51,102,0.1);
  border-color: rgba(255,51,102,0.4);
  color: var(--err);
  box-shadow: 0 0 16px rgba(255,51,102,0.25);
}
.err-msg .msg-name { color: var(--err); text-shadow: 0 0 8px rgba(255,51,102,0.4); }
.err-msg .msg-text { border-color: rgba(255,51,102,0.25); }

/* System note */
.sys-msg {
  align-self: center;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--tx3);
  font-family: var(--f-mono);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--bdr);
  padding: 6px 14px;
  border-radius: 20px;
  animation: fadeIn 0.3s ease;
}
.sys-msg i { color: var(--p); }

/* ══════════════════════════════════════════════════════
   INPUT DOCK
══════════════════════════════════════════════════════ */
.input-dock {
  flex-shrink: 0;
  padding: 0 clamp(16px, 5vw, 48px) clamp(16px, 3vw, 28px);
  /* Add safe area for iPhone home bar */
  padding-bottom: calc(clamp(16px, 3vw, 28px) + var(--safe-bottom));
  background: linear-gradient(to top, var(--bg) 55%, transparent);
}

.input-wrapper {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--bg-2);
  backdrop-filter: var(--blur2);
  -webkit-backdrop-filter: var(--blur2);
  border: 1px solid var(--bdr2);
  border-radius: var(--r3);
  padding: 12px 14px;
  box-shadow: var(--shadow-float), var(--inset-light);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.input-wrapper:focus-within {
  border-color: var(--p-dim);
  box-shadow: var(--shadow-float), 0 0 0 3px var(--p-soft), var(--inset-light);
}

.prompt-prefix {
  font-family: var(--f-mono);
  font-size: 13px;
  white-space: nowrap;
  user-select: none;
  margin-bottom: 9px;
  flex-shrink: 0;
}
.pp-user { color: var(--p); font-weight: 600; text-shadow: 0 0 8px var(--p-glow); }
.pp-at, .pp-sep { color: var(--tx3); }
.pp-host { color: var(--tx2); }

.chat-input {
  flex-grow: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--tx);
  font-family: var(--f-ui);
  font-size: 15px;
  line-height: 1.5;
  resize: none;
  min-height: 26px;
  max-height: 200px;
  padding: 5px 0;
  /* Prevent iOS auto-zoom (must be >= 16px) */
  font-size: 16px;
}
.chat-input::placeholder { color: var(--tx3); font-size: 14px; }

.send-btn {
  flex-shrink: 0;
  width: 46px; height: 46px;
  border-radius: var(--r2);
  background: var(--p);
  color: #000;
  border: none;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 0 20px var(--p-glow);
  transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.send-btn:hover { transform: scale(1.08); box-shadow: 0 0 32px var(--p-glow); }
.send-btn:active { transform: scale(0.95); }
.send-btn:disabled { background: rgba(255,255,255,0.08); color: var(--tx3); box-shadow: none; cursor: not-allowed; transform: none; }
.send-btn.sending i { animation: sendAnim 0.5s ease; }

.input-meta {
  max-width: 820px;
  margin: 10px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  font-size: 11px;
  color: var(--tx3);
  gap: 8px;
}

.active-module-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--p-soft);
  border: 1px solid var(--p-dim);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  color: var(--p);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
  transition: all 0.3s;
}

.kb-hint { white-space: nowrap; }
.kb-hint kbd {
  font-family: var(--f-mono);
  font-size: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--bdr2);
  border-bottom-width: 2px;
  padding: 2px 5px;
  border-radius: 4px;
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Tablet (768–1024px)
══════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root { --sidebar-w: clamp(220px, 28vw, 270px); }
  .mod-tag { display: none; }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Mobile & Foldable (≤ 850px)
══════════════════════════════════════════════════════ */
@media (max-width: 850px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: min(85vw, 320px);
    height: 100dvh;
    padding-top: calc(var(--safe-top) + 16px);
    padding-bottom: calc(var(--safe-bottom) + 16px);
    padding-left: var(--safe-left);
    z-index: 300;
    box-shadow: 24px 0 60px rgba(0,0,0,0.8);
  }

  .sidebar.open {
    left: 0;
    animation: fadeLeft 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .mobile-header { display: flex; }
  .prompt-prefix { display: none; }
  .kb-hint { display: none; }
  .input-meta { justify-content: center; }

  .active-module-badge { max-width: none; }

  .chat-history {
    padding: 20px 16px;
    gap: 20px;
  }

  .input-dock {
    padding: 0 12px calc(12px + var(--safe-bottom));
  }

  .input-wrapper { border-radius: var(--r2); padding: 10px 12px; gap: 8px; }

  .ai-msg { max-width: 95%; }
  .user-msg { max-width: 90%; }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Small phones (≤ 480px)
══════════════════════════════════════════════════════ */
@media (max-width: 480px) {
  .capability-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .cap-card { padding: 10px 12px; font-size: 12px; }
  .sq-btn { font-size: 13px; padding: 10px 14px; }
  .msg-avatar { width: 34px; height: 34px; font-size: 15px; }
  .send-btn { width: 44px; height: 44px; }
  .mod-tag, .mod-icon { }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Foldable (folded, narrow ≤ 360px)
══════════════════════════════════════════════════════ */
@media (max-width: 360px) {
  .sidebar { width: 100vw; }
  .msg-text { padding: 12px 14px; font-size: 14px; }
  .ai-msg { max-width: 100%; }
  .user-msg { max-width: 95%; }
  .capability-grid { grid-template-columns: 1fr 1fr; }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Landscape mobile (height ≤ 500px)
══════════════════════════════════════════════════════ */
@media (max-height: 500px) and (orientation: landscape) {
  .mobile-header { padding: 8px 16px; }
  .input-dock { padding-bottom: calc(8px + var(--safe-bottom)); }
  .chat-history { padding: 12px 16px; gap: 12px; }
  .capability-grid { display: none; }
  .sq-label, .sq-btn:nth-child(n+3) { display: none; }
  .brand { margin-bottom: 12px; padding-bottom: 12px; }
}

/* ══════════════════════════════════════════════════════
   RESPONSIVE — Wide desktop (≥ 1400px)
══════════════════════════════════════════════════════ */
@media (min-width: 1400px) {
  :root { --sidebar-w: 300px; }
  .chat-history { padding: 56px 64px; }
  .input-dock { padding: 0 64px 36px; }
}

/* ── UTILITY ───────────────────────────────────────── */
.hidden { display: none !important; }

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