/* =====================================================================
   Nagaland AI — chat UI (dark by default, light via html[data-theme=light])
   ===================================================================== */
/* Global fallbacks so .nai-btn / .nai-iconbtn used outside the chat (theme header) still get real values. */
:root {
  --nai-bg: #0B1118; --nai-bg-2: #0F1720; --nai-bg-3: #142030; --nai-line: rgba(255, 255, 255, .08); --nai-line-2: rgba(255, 255, 255, .14);
  --nai-text: #F2F6F4; --nai-muted: #9FB0A8; --nai-green: #10B981; --nai-green-2: #0d9488; --nai-gold: #EAC85E; --nai-cyan: #67E8F9; --nai-danger: #EF4444;
  --nai-user: linear-gradient(135deg, #10B981, #0d9488); --nai-radius: 22px;
  --nai-font: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; --nai-shadow: 0 24px 60px rgba(0, 0, 0, .45);
}
html[data-theme="light"] {
  --nai-bg: #FFFFFF; --nai-bg-2: #F3F7F5; --nai-bg-3: #E8F0EC; --nai-line: rgba(15, 36, 25, .1); --nai-line-2: rgba(15, 36, 25, .18);
  --nai-text: #0F2419; --nai-muted: #526B5E; --nai-cyan: #0a7558; --nai-gold: #8a6a14; --nai-shadow: 0 20px 50px rgba(15, 36, 25, .12);
}
.nai-chat {
  --nai-bg: #0B1118;
  --nai-bg-2: #0F1720;
  --nai-bg-3: #142030;
  --nai-line: rgba(255, 255, 255, .08);
  --nai-line-2: rgba(255, 255, 255, .14);
  --nai-text: #F2F6F4;
  --nai-muted: #9FB0A8;
  --nai-green: #10B981;
  --nai-green-2: #0d9488;
  --nai-gold: #EAC85E;
  --nai-cyan: #67E8F9;
  --nai-danger: #EF4444;
  --nai-user: linear-gradient(135deg, #10B981, #0d9488);
  --nai-radius: 22px;
  --nai-font: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --nai-shadow: 0 24px 60px rgba(0, 0, 0, .45);
  color: var(--nai-text);
  font-family: var(--nai-font);
  font-size: 15px;
  line-height: 1.55;
  position: relative;
  display: flex;
  background: radial-gradient(120% 90% at 50% 0%, #13283a 0%, #0e1b27 40%, #090f16 100%);
  border: 1px solid var(--nai-line);
  border-radius: var(--nai-radius);
  box-shadow: var(--nai-shadow);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
html[data-theme="light"] .nai-chat {
  --nai-bg: #FFFFFF;
  --nai-bg-2: #F3F7F5;
  --nai-bg-3: #E8F0EC;
  --nai-line: rgba(15, 36, 25, .1);
  --nai-line-2: rgba(15, 36, 25, .18);
  --nai-text: #0F2419;
  --nai-muted: #526B5E;
  --nai-cyan: #0a7558;
  --nai-gold: #8a6a14;
  --nai-shadow: 0 20px 50px rgba(15, 36, 25, .12);
  background: linear-gradient(180deg, #ffffff 0%, #f3f7f5 100%);
}
.nai-chat *, .nai-chat *::before, .nai-chat *::after { box-sizing: border-box; }
.nai-chat--embed { height: min(680px, 80vh); min-height: 520px; }
.nai-chat--full { position: fixed; inset: 0; border-radius: 0; border: 0; height: 100dvh; z-index: 1000; }
body.nai-chat-full { overflow: hidden; }

/* logo mark */
.nai-logo-mark { display: inline-block; width: 22px; height: 22px; background: url("../img/face-icon.png") center / contain no-repeat; position: relative; flex-shrink: 0; filter: drop-shadow(0 3px 8px rgba(255, 70, 40, .35)); }
.nai-logo-mark::after { content: none; }
.nai-logo-mark--lg { width: 64px; height: 64px; }

/* sidebar (full layout) */
.nai-chat__sidebar { width: 290px; flex-shrink: 0; display: flex; flex-direction: column; gap: 12px; padding: 16px 14px; background: rgba(0, 0, 0, .22); border-right: 1px solid var(--nai-line); }
html[data-theme="light"] .nai-chat__sidebar { background: var(--nai-bg-2); }
.nai-chat__sidebar-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 2px 4px 6px; }
.nai-chat__brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.2px; text-decoration: none; color: inherit; font-size: 15px; }
.nai-live { font-size: 10px; letter-spacing: .6px; text-transform: uppercase; color: var(--nai-green); background: rgba(16,185,129,.12); border: 1px solid rgba(16,185,129,.35); padding: 2px 7px; border-radius: 999px; font-weight: 800; }
.nai-sidebar-close { display: none; }
.nai-chat__list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 4px; margin: 4px -4px; padding: 0 4px; }
.nai-chat__item { display: flex; align-items: center; gap: 8px; padding: 10px 10px; border-radius: 12px; cursor: pointer; border: 1px solid transparent; }
.nai-chat__item:hover { background: rgba(255,255,255,.05); }
html[data-theme="light"] .nai-chat__item:hover { background: rgba(15,36,25,.05); }
.nai-chat__item.is-active { background: rgba(16,185,129,.1); border-color: rgba(16,185,129,.3); }
.nai-chat__item-text { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.nai-chat__item-text strong { font-size: 13.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nai-chat__item-text small { font-size: 11px; color: var(--nai-muted); }
.nai-chat__del { background: none; border: 0; color: var(--nai-muted); font-size: 18px; width: 26px; height: 26px; border-radius: 8px; cursor: pointer; opacity: 0; }
.nai-chat__item:hover .nai-chat__del { opacity: 1; }
.nai-chat__del:hover { background: rgba(239,68,68,.15); color: #f87171; }
.nai-chat__empty { padding: 24px 10px; text-align: center; font-size: 13px; color: var(--nai-muted); }
.nai-chat__sidebar-foot { display: flex; flex-direction: column; gap: 8px; padding-top: 10px; border-top: 1px solid var(--nai-line); }
.nai-userchip { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; padding: 8px; border-radius: 12px; }
.nai-userchip:hover { background: rgba(255,255,255,.05); }
.nai-userchip span:last-child { display: flex; flex-direction: column; line-height: 1.2; }
.nai-userchip strong { font-size: 14px; }
.nai-userchip small { font-size: 11.5px; color: var(--nai-muted); }
.nai-avatar { width: 34px; height: 34px; border-radius: 50%; background: linear-gradient(135deg, #EAC85E, #d4a843); color: #06130d; display: inline-flex; align-items: center; justify-content: center; font-weight: 800; }
.nai-chat__overlay { display: none; position: absolute; inset: 0; background: rgba(0,0,0,.5); z-index: 5; }

/* main column */
.nai-chat__main { flex: 1; min-width: 0; display: flex; flex-direction: column; position: relative; }
.nai-chat__bar { display: flex; align-items: center; gap: 10px; padding: 12px 14px; border-bottom: 1px solid var(--nai-line); background: rgba(0,0,0,.18); position: relative; z-index: 3; }
html[data-theme="light"] .nai-chat__bar { background: rgba(255,255,255,.7); backdrop-filter: blur(8px); }
.nai-iconbtn { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--nai-line); background: rgba(255,255,255,.04); color: var(--nai-text); cursor: pointer; text-decoration: none; transition: background .15s, border-color .15s; }
html[data-theme="light"] .nai-iconbtn { background: #fff; }
.nai-iconbtn:hover { background: rgba(16,185,129,.12); border-color: rgba(16,185,129,.4); }
.nai-chat-menu { flex-direction: column; gap: 4px; }
.nai-chat-menu span { width: 16px; height: 2px; background: currentColor; border-radius: 2px; }
.nai-modes { display: inline-flex; background: rgba(0,0,0,.25); border: 1px solid var(--nai-line); border-radius: 999px; padding: 3px; margin: 0 auto; }
html[data-theme="light"] .nai-modes { background: var(--nai-bg-3); }
.nai-mode { border: 0; background: transparent; color: var(--nai-muted); padding: 7px 14px; border-radius: 999px; font: inherit; font-size: 13px; font-weight: 700; cursor: pointer; transition: all .15s; }
.nai-mode.is-active { background: var(--nai-user); color: #fff; box-shadow: 0 6px 16px rgba(16,185,129,.3); }
.nai-chat__tools { display: inline-flex; align-items: center; gap: 6px; margin-left: auto; }
.nai-usage { font-size: 11.5px; font-weight: 700; color: var(--nai-green); background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); padding: 5px 10px; border-radius: 999px; white-space: nowrap; }
.nai-usage.is-low { color: var(--nai-gold); background: rgba(234,200,94,.12); border-color: rgba(234,200,94,.4); }
.nai-usage:empty { display: none; }

/* embed history dropdown */
.nai-history { display: none; position: absolute; right: 12px; top: calc(100% + 6px); width: min(320px, 90vw); max-height: 320px; overflow: auto; background: var(--nai-bg-2); border: 1px solid var(--nai-line-2); border-radius: 14px; box-shadow: var(--nai-shadow); padding: 6px; z-index: 20; }
.nai-history.is-open { display: block; }

/* student bar */
.nai-student { display: flex; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--nai-line); background: rgba(234,200,94,.05); }
.nai-student[hidden] { display: none; }
.nai-student label { flex: 1; display: flex; flex-direction: column; gap: 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--nai-muted); font-weight: 700; }
.nai-student select { font: inherit; font-size: 14px; color: var(--nai-text); background: var(--nai-bg-2); border: 1px solid var(--nai-line-2); border-radius: 10px; padding: 8px 10px; }

/* messages */
.nai-chat__messages { flex: 1; overflow-y: auto; padding: 18px 16px 10px; display: flex; flex-direction: column; gap: 14px; scroll-behavior: smooth; }
.nai-welcome { margin: auto; text-align: center; max-width: 560px; padding: 20px 10px; }
.nai-welcome__orb { width: 92px; height: 92px; margin: 0 auto 14px; background: url("../img/face-icon.png") center / contain no-repeat; position: relative; filter: drop-shadow(0 14px 26px rgba(255, 70, 40, .38)); animation: nai-float 4s ease-in-out infinite; }
.nai-welcome__orb::after { content: none; }
@keyframes nai-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-6px); } }
.nai-welcome h2 { font-size: clamp(20px, 3vw, 26px); font-weight: 800; letter-spacing: -.4px; margin: 0 0 8px; color: var(--nai-text); }
.nai-welcome p { color: var(--nai-muted); margin: 0 0 18px; font-size: 14.5px; }
.nai-suggestions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.nai-suggestion { font: inherit; font-size: 13px; font-weight: 600; color: var(--nai-text); background: rgba(255,255,255,.05); border: 1px solid var(--nai-line-2); border-radius: 999px; padding: 9px 14px; cursor: pointer; transition: all .15s; }
html[data-theme="light"] .nai-suggestion { background: #fff; }
.nai-suggestion:hover { border-color: var(--nai-green); background: rgba(16,185,129,.1); transform: translateY(-1px); }
.nai-suggestion--student { display: inline-flex; align-items: center; gap: 6px; border-color: rgba(234,200,94,.55); background: rgba(234,200,94,.1); }
.nai-suggestion--student:hover { border-color: #EAC85E; background: rgba(234,200,94,.18); }
/* Student Mode welcome */
.nai-welcome--student .nai-welcome__orb { filter: drop-shadow(0 14px 26px rgba(234, 200, 94, .32)); }
.nai-welcome__badge { position: absolute; left: 50%; bottom: -12px; transform: translateX(-50%); display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; background: #EAC85E; color: #1a1403; font-size: 11px; font-weight: 800; letter-spacing: .3px; text-transform: uppercase; padding: 4px 10px; border-radius: 999px; box-shadow: 0 6px 16px rgba(0,0,0,.25); }
.nai-welcome--student .nai-welcome__orb { margin-bottom: 26px; }
.nai-levels { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px; margin: 0 0 14px; }
.nai-levels__label { font-size: 11px; font-weight: 800; letter-spacing: .6px; text-transform: uppercase; color: var(--nai-muted); margin-right: 4px; }
.nai-level { font: inherit; font-size: 12.5px; font-weight: 700; color: var(--nai-text); background: transparent; border: 1px solid var(--nai-line-2); border-radius: 999px; padding: 7px 12px; cursor: pointer; transition: all .15s; }
.nai-level:hover { border-color: #EAC85E; }
.nai-level.is-active { background: #EAC85E; border-color: #EAC85E; color: #1a1403; box-shadow: 0 6px 16px rgba(234,200,94,.3); }
.nai-welcome__hint { margin-top: 16px; font-size: 12.5px; color: var(--nai-muted); }

.nai-msg { display: flex; gap: 10px; max-width: 92%; animation: nai-in .22s ease; }
@keyframes nai-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.nai-msg--user { align-self: flex-end; flex-direction: row-reverse; max-width: 80%; }
.nai-msg__avatar { width: 30px; height: 30px; border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
.nai-msg__body { padding: 12px 15px; border-radius: 18px; background: rgba(255,255,255,.06); border: 1px solid var(--nai-line); font-size: 15px; line-height: 1.6; word-wrap: break-word; overflow-wrap: anywhere; min-width: 0; }
html[data-theme="light"] .nai-msg__body { background: #fff; }
.nai-msg--ai .nai-msg__body { border-top-left-radius: 6px; }
.nai-msg--user .nai-msg__body { background: var(--nai-user); color: #fff; border: 0; border-top-right-radius: 6px; box-shadow: 0 8px 20px rgba(16,185,129,.25); }
.nai-msg--error .nai-msg__body { border-color: rgba(234,200,94,.4); background: rgba(234,200,94,.07); }
.nai-msg__body p { margin: 0 0 10px; }
.nai-msg__body p:last-child { margin-bottom: 0; }
.nai-msg__body h4 { margin: 12px 0 6px; font-size: 15px; font-weight: 800; }
.nai-msg__body ul, .nai-msg__body ol { margin: 6px 0 10px; padding-left: 20px; }
.nai-msg__body li { margin: 4px 0; }
.nai-msg__body a { color: var(--nai-cyan); text-decoration: underline; text-underline-offset: 2px; font-weight: 600; }
.nai-msg__body code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; background: rgba(0,0,0,.25); padding: 2px 6px; border-radius: 6px; }
html[data-theme="light"] .nai-msg__body code { background: rgba(15,36,25,.08); }
.nai-msg__body pre { background: rgba(0,0,0,.35); padding: 12px; border-radius: 12px; overflow-x: auto; margin: 8px 0; }
.nai-msg__body pre code { background: none; padding: 0; }
.nai-msg__body blockquote { margin: 8px 0; padding: 6px 12px; border-left: 3px solid var(--nai-green); color: var(--nai-muted); }
.nai-msg__body hr { border: 0; border-top: 1px solid var(--nai-line-2); margin: 10px 0; }
.nai-msg__body strong { font-weight: 700; }
.nai-msg__tools { display: none; align-self: flex-end; }
.nai-msg--ai:hover .nai-msg__tools { display: block; }
.nai-copy { font: inherit; font-size: 11px; font-weight: 700; color: var(--nai-muted); background: none; border: 1px solid var(--nai-line); border-radius: 8px; padding: 4px 8px; cursor: pointer; }
.nai-copy:hover { color: var(--nai-text); border-color: var(--nai-line-2); }
.nai-dots { display: inline-flex; gap: 5px; padding: 4px 2px; }
.nai-dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--nai-green); animation: nai-dot 1.1s infinite ease-in-out; }
.nai-dots i:nth-child(2) { animation-delay: .15s; } .nai-dots i:nth-child(3) { animation-delay: .3s; }
@keyframes nai-dot { 0%, 80%, 100% { opacity: .3; transform: scale(.8); } 40% { opacity: 1; transform: scale(1); } }
.nai-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

/* notice */
.nai-chat__notice { margin: 0 16px 8px; padding: 10px 14px; border-radius: 12px; font-size: 13px; background: rgba(234,200,94,.1); border: 1px solid rgba(234,200,94,.35); color: var(--nai-text); }
.nai-chat__notice[hidden] { display: none; }

/* composer */
.nai-composer { display: flex; align-items: flex-end; gap: 10px; margin: 6px 14px 0; padding: 8px 8px 8px 16px; background: var(--nai-bg-2); border: 1px solid var(--nai-line-2); border-radius: 20px; transition: border-color .15s, box-shadow .15s; }
.nai-composer:focus-within { border-color: rgba(16,185,129,.6); box-shadow: 0 0 0 4px rgba(16,185,129,.12); }
.nai-composer textarea { flex: 1; resize: none; border: 0; background: transparent; color: var(--nai-text); font: inherit; font-size: 16px; line-height: 1.5; padding: 8px 0; max-height: 160px; outline: none; }
.nai-composer textarea::placeholder { color: var(--nai-muted); }
.nai-send { width: 42px; height: 42px; border-radius: 14px; border: 0; background: var(--nai-user); color: #fff; display: inline-flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0; box-shadow: 0 8px 18px rgba(16,185,129,.35); transition: transform .12s, opacity .15s; }
.nai-send:hover { transform: translateY(-1px); }
.nai-send:disabled { opacity: .5; cursor: default; transform: none; }
.nai-chat__hint { margin: 8px 16px 12px; font-size: 11.5px; color: var(--nai-muted); text-align: center; }
.nai-chat__hint a { color: var(--nai-green); font-weight: 600; text-decoration: none; }

/* buttons (shared) */
.nai-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: inherit; font-size: 14px; font-weight: 700; padding: 11px 18px; border-radius: 12px; border: 1px solid transparent; cursor: pointer; text-decoration: none !important; transition: transform .12s, background .15s, border-color .15s, box-shadow .15s; line-height: 1.2; }
.nai-btn--primary { background: var(--nai-user); color: #fff !important; box-shadow: 0 8px 20px rgba(16,185,129,.3); }
.nai-btn--primary:hover { transform: translateY(-1px); filter: brightness(1.05); }
.nai-btn--ghost { background: transparent; border-color: var(--nai-line-2); color: var(--nai-text) !important; }
.nai-btn--ghost:hover { border-color: var(--nai-green); background: rgba(16,185,129,.08); }
.nai-btn--soft { background: rgba(16,185,129,.12); color: var(--nai-green) !important; border-color: rgba(16,185,129,.3); }
.nai-btn--block { width: 100%; }
.nai-btn--sm { padding: 8px 13px; font-size: 13px; border-radius: 10px; }

/* app gate / banner */
.nai-gate { position: absolute; inset: 0; z-index: 30; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 28px 22px; background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%); gap: 10px; }
.nai-gate__icon { width: 64px; height: 64px; border-radius: 18px; display: flex; align-items: center; justify-content: center; font-size: 30px; background: linear-gradient(135deg, #10B981, #0d9488); box-shadow: 0 10px 30px rgba(16,185,129,.35); margin-bottom: 6px; }
.nai-gate h3 { margin: 0; font-size: 22px; font-weight: 800; color: #fff; }
.nai-gate p { margin: 0 0 10px; max-width: 320px; color: rgba(242,246,244,.7); font-size: 14px; }
.nai-gate .nai-btn { max-width: 300px; }
.nai-appbanner { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: rgba(16,185,129,.1); border-bottom: 1px solid rgba(16,185,129,.3); font-size: 13px; }
.nai-appbanner div { flex: 1; display: flex; flex-direction: column; line-height: 1.25; }
.nai-appbanner small { color: var(--nai-muted); font-size: 11.5px; }
.nai-appbanner__close { background: none; border: 0; color: var(--nai-muted); font-size: 20px; width: 28px; height: 28px; cursor: pointer; }

/* responsive */
@media (max-width: 900px) {
  .nai-chat--full .nai-chat__sidebar { position: absolute; left: 0; top: 0; bottom: 0; z-index: 6; transform: translateX(-100%); transition: transform .2s ease; width: min(300px, 85vw); }
  .nai-chat--full.is-sidebar-open .nai-chat__sidebar { transform: none; }
  .nai-chat--full.is-sidebar-open .nai-chat__overlay { display: block; }
  .nai-sidebar-close { display: inline-flex; }
}
@media (max-width: 640px) {
  .nai-chat--embed { height: 78vh; min-height: 480px; border-radius: 18px; }
  .nai-chat__bar { padding: 10px 10px; gap: 6px; flex-wrap: wrap; }
  .nai-chat__brand span:last-child:not(.nai-live) { display: none; }
  .nai-modes { order: 3; width: 100%; justify-content: center; margin-top: 2px; }
  .nai-mode { flex: 1; text-align: center; }
  .nai-usage { display: none; }
  .nai-chat__messages { padding: 14px 10px 8px; }
  .nai-msg { max-width: 100%; }
  .nai-msg--user { max-width: 88%; }
  .nai-composer { margin: 6px 10px 0; }
  .nai-chat__hint { margin: 6px 12px 10px; }
  .nai-welcome h2 { font-size: 20px; }
}
@media (prefers-reduced-motion: reduce) { .nai-chat * { animation: none !important; transition: none !important; } }