/* ========== Transcolar AI — Tema verde/laranja moderno ========== */
:root {
  --tc-green-50:  #ecfdf5;
  --tc-green-100: #d1fae5;
  --tc-green-500: #10b981;
  --tc-green-600: #059669;
  --tc-green-700: #047857;
  --tc-green-900: #064e3b;
  --tc-orange-400:#fb923c;
  --tc-orange-500:#f97316;
  --tc-orange-600:#ea580c;
  --tc-bg: #f6f8f7;
  --tc-surface: #ffffff;
  --tc-border: #e7eae8;
  --tc-text: #0f1f1a;
  --tc-text-muted: #5b6b65;
  --tc-shadow: 0 12px 32px rgba(6, 78, 59, 0.10);
  --tc-radius: 14px;
  --bs-primary: var(--tc-green-600);
  --bs-primary-rgb: 5,150,105;
}

html, body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--tc-bg);
  color: var(--tc-text);
  -webkit-font-smoothing: antialiased;
  height: 100%;
}
body { margin: 0; }

.btn-primary {
  background: linear-gradient(135deg, var(--tc-green-600), var(--tc-green-500));
  border: none;
  color: #fff;
  font-weight: 600;
  letter-spacing: .2px;
  box-shadow: 0 6px 18px rgba(5,150,105,.25);
}
.btn-primary:hover, .btn-primary:focus {
  background: linear-gradient(135deg, var(--tc-green-700), var(--tc-green-600));
  color: #fff;
}
.form-control:focus, .form-select:focus {
  border-color: var(--tc-green-500);
  box-shadow: 0 0 0 .2rem rgba(16,185,129,.18);
}

/* ===== Login ===== */
.login-body {
  min-height: 100vh;
  background:
    radial-gradient(1100px 600px at 90% -10%, rgba(249,115,22,.18), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(16,185,129,.22), transparent 60%),
    linear-gradient(180deg, #fafaf7, #eef6f1);
  display: grid;
  place-items: center;
  padding: 24px 16px;
}
.login-shell {
  width: 100%;
  max-width: 460px;
}
.login-card {
  background: var(--tc-surface);
  border-radius: 22px;
  padding: 32px 28px;
  border: 1px solid var(--tc-border);
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 54px; height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--tc-green-600), var(--tc-green-500));
  display: grid; place-items: center;
  position: relative;
  box-shadow: 0 10px 24px rgba(5,150,105,.35);
}
.brand-mark .dot { width: 14px; height: 14px; border-radius: 50%; display: inline-block; }
.brand-mark .dot-green { background: #fff; opacity: .95; }
.brand-mark .dot-orange { background: var(--tc-orange-500); margin-left: -6px; box-shadow: 0 0 0 3px rgba(255,255,255,.3); }
.brand-name { font-weight: 800; margin: 0; font-size: 1.55rem; letter-spacing: -.02em; color: var(--tc-green-900); }
.brand-ai { color: var(--tc-orange-500); }
.brand-sub { color: var(--tc-text-muted); margin: 0; font-size: .92rem; }
.login-foot { color: var(--tc-text-muted); font-size: .85rem; text-align: center; margin: 18px 0 0; }
.login-credit { text-align: center; color: var(--tc-text-muted); font-size: .8rem; margin-top: 16px; }

/* ===== App shell ===== */
.app-body { background: var(--tc-bg); height: 100vh; overflow: hidden; }
.app-shell { display: grid; grid-template-columns: 280px 1fr; height: 100vh; }
@media (max-width: 991px) {
  .app-shell { grid-template-columns: 1fr; }
}

/* Sidebar */
.sidebar {
  background: linear-gradient(180deg, #0c2620 0%, #0a1f1a 100%);
  color: #d3e7df;
  display: flex; flex-direction: column;
  border-right: 1px solid #163a31;
  height: 100vh;
  overflow: hidden;
}
@media (max-width: 991px) {
  .sidebar {
    position: fixed; inset: 0 auto 0 0; width: 86vw; max-width: 320px;
    z-index: 1040;
    transform: translateX(-100%);
    transition: transform .25s ease;
  }
  .sidebar.open { transform: translateX(0); }
}
.sidebar-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 16px 8px;
}
.brand-mini { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.brand-mini-name { font-size: 1rem; color: #fff; letter-spacing: -.01em; }
.brand-mini-name b { color: var(--tc-orange-400); }
.brand-mini .dot { width: 10px; height: 10px; border-radius: 50%; }
.brand-mini .dot-green { background: var(--tc-green-500); }
.brand-mini .dot-orange { background: var(--tc-orange-500); margin-left: -4px; }

.btn-newchat {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  margin: 8px 12px 12px;
  padding: 11px 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--tc-orange-500), var(--tc-orange-400));
  color: #fff; font-weight: 600;
  border: none;
  box-shadow: 0 8px 18px rgba(249,115,22,.28);
}
.btn-newchat:hover { filter: brightness(1.08); color: #fff; }

.sidebar-section-title {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .12em;
  color: #7fa092; padding: 6px 18px;
}
.chats-list { flex: 1 1 auto; overflow-y: auto; padding: 4px 8px; }
.chat-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: #d3e7df;
  transition: background .15s;
  position: relative;
}
.chat-item:hover { background: #14342c; }
.chat-item.active { background: linear-gradient(90deg, #1a4a3e, #14342c); color: #fff; }
.chat-item .chat-title { flex: 1; min-width: 0; font-size: .93rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item .chat-del {
  border: none; background: transparent; color: #7fa092; opacity: 0;
  transition: opacity .15s, color .15s;
  padding: 4px 6px; border-radius: 6px;
}
.chat-item:hover .chat-del, .chat-item.active .chat-del { opacity: 1; }
.chat-item .chat-del:hover { color: #fda4af; background: rgba(255,255,255,.06); }

.quota-card {
  margin: 10px 12px;
  background: rgba(255,255,255,.04);
  border: 1px solid #163a31;
  border-radius: 12px;
  padding: 10px 12px;
}
.quota-label { font-size: .78rem; color: #a8c1b6; }
.quota-pill { font-size: .78rem; color: #fff; background: var(--tc-orange-500); padding: 2px 8px; border-radius: 999px; font-weight: 600; }
.quota-bar { height: 6px; background: #14342c; }
.quota-bar .progress-bar { background: linear-gradient(90deg, var(--tc-green-500), var(--tc-orange-500)); }

.sidebar-footer { padding: 10px 12px 14px; border-top: 1px solid #163a31; }
.user-block { display: flex; align-items: center; gap: 10px; }
.user-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--tc-green-500), var(--tc-orange-500));
  color: #fff; display: grid; place-items: center; font-weight: 700; flex-shrink: 0;
}
.user-name { font-size: .9rem; color: #fff; font-weight: 600; }
.user-role { font-size: .75rem; color: #a8c1b6; }

.btn-icon {
  background: transparent; border: none; color: #a8c1b6;
  width: 36px; height: 36px; border-radius: 8px;
  display: grid; place-items: center;
}
.btn-icon:hover { background: rgba(255,255,255,.06); color: #fff; }

.sidebar-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 1030;
}
.sidebar-backdrop.show { display: block; }

/* Main */
.main { display: flex; flex-direction: column; height: 100vh; min-width: 0; background: var(--tc-bg); }
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--tc-border);
  background: var(--tc-surface);
}
.topbar .btn-icon { color: var(--tc-text-muted); }
.topbar .btn-icon:hover { background: var(--tc-green-50); color: var(--tc-green-700); }
.topbar-title { font-size: 1.05rem; font-weight: 700; margin: 0; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--tc-green-900); }
.topbar-meta { font-size: .8rem; color: var(--tc-text-muted); }

.messages {
  flex: 1 1 auto; overflow-y: auto; padding: 24px 18px 12px;
  scroll-behavior: smooth;
}
.msg-wrap { max-width: 820px; margin: 0 auto 18px; }
.msg { display: flex; gap: 12px; }
.msg .avatar {
  width: 32px; height: 32px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; color: #fff; flex-shrink: 0;
  font-size: .85rem;
}
.msg-user .avatar { background: linear-gradient(135deg, #475569, #64748b); }
.msg-assistant .avatar { background: linear-gradient(135deg, var(--tc-green-600), var(--tc-orange-500)); }
.msg .body { flex: 1; min-width: 0; }
.msg .role { font-size: .78rem; color: var(--tc-text-muted); margin-bottom: 4px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.msg-content {
  background: var(--tc-surface);
  border: 1px solid var(--tc-border);
  border-radius: var(--tc-radius);
  padding: 14px 16px;
  line-height: 1.6;
  font-size: .98rem;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.msg-user .msg-content { background: linear-gradient(135deg, #ecfdf5, #fff7ed); border-color: #e7f1ec; }
.msg-content > *:first-child { margin-top: 0; }
.msg-content > *:last-child { margin-bottom: 0; }
.msg-content pre { background: #0c1f1a; color: #e6ede9; padding: 12px 14px; border-radius: 10px; overflow-x: auto; font-size: .85rem; }
.msg-content code { background: #f1f5f3; padding: 1px 6px; border-radius: 5px; font-size: .88em; color: var(--tc-green-700); }
.msg-content pre code { background: transparent; padding: 0; color: inherit; }
.msg-content table { border-collapse: collapse; width: 100%; font-size: .88rem; margin: 8px 0; }
.msg-content table th, .msg-content table td { border: 1px solid var(--tc-border); padding: 6px 10px; text-align: left; }
.msg-content table th { background: var(--tc-green-50); color: var(--tc-green-900); }

.attachment {
  margin-top: 10px;
  border: 1px solid var(--tc-border);
  border-radius: 12px;
  overflow: hidden;
  background: #fafdfc;
}
.attachment-head {
  padding: 8px 12px;
  display: flex; align-items: center; justify-content: space-between;
  background: linear-gradient(90deg, var(--tc-green-50), #fff7ed);
  border-bottom: 1px solid var(--tc-border);
  font-size: .85rem; font-weight: 600; color: var(--tc-green-900);
}
.attachment-head .btn-dl {
  border: none; background: var(--tc-green-600); color: #fff; padding: 4px 10px; border-radius: 6px; font-size: .8rem; font-weight: 600;
}
.attachment-head .btn-dl:hover { background: var(--tc-green-700); }
.attachment-body { max-height: 360px; overflow: auto; padding: 8px 12px; }
.attachment iframe { width: 100%; min-height: 480px; border: none; display: block; background: #fff; }

.empty-state {
  max-width: 720px; margin: 60px auto; text-align: center; color: var(--tc-text-muted);
}
.empty-state h2 { color: var(--tc-green-900); font-weight: 800; letter-spacing: -.02em; }
.suggest-grid { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; margin-top: 20px; }
@media (max-width: 600px) { .suggest-grid { grid-template-columns: 1fr; } }
.suggest-card {
  background: var(--tc-surface); border: 1px solid var(--tc-border);
  border-radius: 12px; padding: 14px; text-align: left;
  cursor: pointer; transition: all .15s;
}
.suggest-card:hover { border-color: var(--tc-green-500); box-shadow: var(--tc-shadow); transform: translateY(-1px); }
.suggest-card b { color: var(--tc-green-900); }
.suggest-card span { color: var(--tc-text-muted); font-size: .85rem; }

.composer-wrap { padding: 12px 18px 18px; border-top: 1px solid var(--tc-border); background: var(--tc-surface); }
.composer {
  max-width: 820px; margin: 0 auto;
  background: #fff; border: 1px solid var(--tc-border); border-radius: 16px;
  display: flex; align-items: flex-end; gap: 8px; padding: 8px 8px 8px 14px;
  box-shadow: 0 6px 18px rgba(6,78,59,.06);
  transition: border-color .15s, box-shadow .15s;
}
.composer:focus-within { border-color: var(--tc-green-500); box-shadow: 0 0 0 .2rem rgba(16,185,129,.15); }
.composer-input {
  flex: 1; border: none; outline: none; resize: none;
  font-size: 1rem; padding: 10px 4px; max-height: 200px; font-family: inherit;
  background: transparent;
}
.btn-send {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--tc-green-600), var(--tc-orange-500));
  color: #fff; border: none; flex-shrink: 0;
  display: grid; place-items: center; font-size: 1.1rem;
}
.btn-send:disabled { opacity: .4; cursor: not-allowed; }
.btn-send:hover:not(:disabled) { filter: brightness(1.08); }
.composer-foot { max-width: 820px; margin: 6px auto 0; display: flex; justify-content: space-between; }

.typing { display: inline-flex; gap: 4px; align-items: center; }
.typing span {
  width: 6px; height: 6px; border-radius: 50%; background: var(--tc-green-600);
  animation: typing 1.2s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: .15s; background: var(--tc-orange-500); }
.typing span:nth-child(3) { animation-delay: .3s; background: var(--tc-green-600); }
@keyframes typing { 0%,80%,100% { opacity: .3; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-3px); } }

.toast-error {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: #dc2626; color: #fff; padding: 10px 18px; border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.2); z-index: 2000; font-size: .9rem;
}