:root {
  --knh-charcoal: #4A4A4A;
  --knh-orange: #F07D00;
  --knh-orange-light: #FF9A2E;
  --knh-dark: #2C2C2C;
  --knh-light-bg: #F5F5F5;
  --knh-white: #FFFFFF;
  --knh-text: #333333;
  --knh-text-light: #888888;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif; background: var(--knh-light-bg); color: var(--knh-text); }
.screen { min-height: 100vh; }
.orange { color: var(--knh-orange); font-weight: 700; }
.error-msg { color: #d32f2f; text-align: center; margin-top: 12px; font-size: 14px; }

/* === Buttons === */
.btn-primary { background: var(--knh-orange); color: white; border: none; padding: 12px 24px; border-radius: 6px; font-size: 15px; font-weight: 600; cursor: pointer; width: 100%; transition: all .2s; }
.btn-primary:hover { background: var(--knh-orange-light); box-shadow: 0 4px 12px rgba(240,125,0,.3); }
.btn-small { background: transparent; border: 1px solid var(--knh-orange); color: var(--knh-orange); padding: 6px 14px; border-radius: 6px; font-size: 13px; cursor: pointer; transition: all .2s; }
.btn-small:hover { background: var(--knh-orange); color: white; }

/* === Login === */
#login-screen { display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #f8f8f8, #e8e8e8, #f0f0f0); }
.login-container { max-width: 420px; width: 90%; padding: 48px 40px; background: white; border-radius: 16px; box-shadow: 0 8px 32px rgba(0,0,0,.08); border-top: 4px solid var(--knh-orange); text-align: center; animation: float 3s ease-in-out infinite; }
@keyframes float {
  0% { transform: translateY(0px); box-shadow: 0 8px 32px rgba(0,0,0,.08); }
  50% { transform: translateY(-12px); box-shadow: 0 20px 48px rgba(0,0,0,.12); }
  100% { transform: translateY(0px); box-shadow: 0 8px 32px rgba(0,0,0,.08); }
}
.login-logo { margin-bottom: 8px; }
.login-subtitle { font-size: 13px; letter-spacing: 3px; color: var(--knh-charcoal); text-transform: uppercase; font-weight: 500; }
.login-title { font-size: 20px; font-weight: 600; color: var(--knh-dark); }
.login-divider { width: 60px; height: 3px; background: var(--knh-orange); margin: 14px auto; border-radius: 2px; }
.login-footer { margin-top: 24px; font-size: 12px; color: #999; }
#login-form input { width: 100%; padding: 12px 16px; margin-bottom: 12px; border: 2px solid #ddd; border-radius: 6px; font-size: 14px; outline: none; transition: border .2s; }
#login-form input:focus { border-color: var(--knh-orange); }
#login-form button { margin-top: 8px; }

/* === Top Bar === */
.top-bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; background: var(--knh-dark); border-bottom: 3px solid var(--knh-orange); }
.top-bar-logo { color: white; font-size: 24px; font-weight: 800; letter-spacing: 2px; }
.orange-bar { display: inline-block; width: 4px; height: 24px; background: var(--knh-orange); margin-left: 6px; border-radius: 2px; vertical-align: middle; }
.top-bar-nav { display: flex; gap: 8px; }
.top-bar-nav .btn-small { color: white; border-color: rgba(255,255,255,.3); }
.top-bar-nav .btn-small:hover, .top-bar-nav .btn-small.active { background: var(--knh-orange); border-color: var(--knh-orange); color: white; }
.top-bar-user { display: flex; align-items: center; gap: 12px; color: #aaa; font-size: 13px; }
.top-bar-user .btn-small { color: #aaa; border-color: rgba(255,255,255,.2); }

/* === Dashboard === */
.dashboard { max-width: 1000px; margin: 0 auto; padding: 40px 24px; text-align: center; }
.dashboard h1 { font-size: 28px; color: var(--knh-charcoal); margin-bottom: 4px; }
.dashboard .subtitle { color: var(--knh-text-light); margin-bottom: 32px; }
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.app-card { background: white; border-radius: 20px; padding: 32px 20px 24px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,.06); border: 2px solid transparent; transition: all .3s; cursor: pointer; }
.app-card:hover:not(.disabled) { border-color: var(--knh-orange); box-shadow: 0 8px 28px rgba(240,125,0,.18); transform: translateY(-4px); }
.app-card.disabled { opacity: .45; cursor: default; }
.app-card .icon { font-size: 52px; margin-bottom: 14px; }
.app-card .title { font-size: 17px; font-weight: 700; color: var(--knh-charcoal); margin-bottom: 6px; }
.app-card .desc { font-size: 13px; color: var(--knh-text-light); line-height: 1.5; }
.app-badge { display: inline-block; margin-top: 12px; padding: 3px 12px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.badge-active { background: var(--knh-orange); color: white; }
.badge-soon { background: #e0e0e0; color: #888; }

/* === Chat === */
.chat-layout { display: flex; height: calc(100vh - 56px); }
.chat-sidebar { width: 260px; background: var(--knh-dark); padding: 20px 16px; overflow-y: auto; color: white; }
.chat-sidebar h3 { font-size: 14px; margin-bottom: 12px; color: #aaa; }
.chat-sidebar .chat-item { padding: 8px 12px; border-radius: 6px; cursor: pointer; font-size: 13px; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: background .2s; }
.chat-sidebar .chat-item:hover { background: rgba(240,125,0,.2); }
.chat-main { flex: 1; display: flex; flex-direction: column; }
.chat-messages { flex: 1; overflow-y: auto; padding: 24px; }
.msg { margin-bottom: 16px; max-width: 80%; }
.msg.user { margin-left: auto; }
.msg.assistant { margin-right: auto; }
.msg-bubble { padding: 14px 18px; border-radius: 14px; font-size: 14px; line-height: 1.6; }
.msg.user .msg-bubble { background: var(--knh-orange); color: white; border-bottom-right-radius: 4px; }
.msg.assistant .msg-bubble { background: white; border: 1px solid #e0e0e0; border-bottom-left-radius: 4px; }
.msg.assistant .msg-bubble img { max-width: 350px; border-radius: 8px; margin: 8px 0; }
.msg-sources { margin-top: 8px; display: flex; gap: 8px; flex-wrap: wrap; }
.msg-sources a { font-size: 11px; color: var(--knh-orange); text-decoration: none; }
.msg-feedback { margin-top: 6px; }
.msg-feedback button { background: none; border: 1px solid #ddd; border-radius: 4px; padding: 2px 8px; cursor: pointer; font-size: 14px; margin-right: 4px; }
.msg-feedback button:hover { border-color: var(--knh-orange); }
.chat-input-bar { display: flex; gap: 8px; padding: 16px 24px; border-top: 1px solid #e0e0e0; background: white; }
.chat-input-bar input { flex: 1; padding: 12px 16px; border: 2px solid #ddd; border-radius: 8px; font-size: 14px; outline: none; }
.chat-input-bar input:focus { border-color: var(--knh-orange); }
.btn-send { width: auto; padding: 12px 28px; }
.typing { color: var(--knh-text-light); font-style: italic; padding: 14px 18px; }

/* === Billing === */
.billing-main { max-width: 1100px; margin: 0 auto; padding: 24px; }
.billing-tab h2 { font-size: 22px; color: var(--knh-charcoal); margin-bottom: 16px; }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.metric-card { background: white; border-radius: 8px; padding: 16px; box-shadow: 0 1px 4px rgba(0,0,0,.08); border-left: 4px solid var(--knh-orange); }
.metric-card .label { font-size: 12px; color: var(--knh-text-light); text-transform: uppercase; }
.metric-card .value { font-size: 24px; font-weight: 700; color: var(--knh-charcoal); }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--knh-charcoal); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; border: 2px solid #ddd; border-radius: 6px; font-size: 14px; outline: none; }
.form-group input:focus, .form-group select:focus { border-color: var(--knh-orange); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card { background: white; border-radius: 12px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,.06); margin-bottom: 16px; }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.card-header h3 { font-size: 15px; color: var(--knh-charcoal); }
.status-badge { padding: 3px 10px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.status-draft { background: #eee; color: #666; }
.status-sent { background: #fff3cd; color: #856404; }
.status-paid { background: #d4edda; color: #155724; }
.status-overdue { background: #f8d7da; color: #721c24; }
.rvg-result { background: white; border-radius: 12px; padding: 24px; border: 2px solid var(--knh-orange); margin-top: 16px; }
.rvg-total { font-size: 28px; font-weight: 700; color: var(--knh-orange); text-align: right; }
table { width: 100%; border-collapse: collapse; }
th { background: var(--knh-charcoal); color: white; padding: 8px 12px; font-size: 12px; text-align: left; }
td { padding: 8px 12px; border-bottom: 1px solid #eee; font-size: 13px; }
tr:hover { background: #fafafa; }

@media (max-width: 768px) {
  .app-grid { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: 1fr; }
  .chat-sidebar { display: none; }
  .msg { max-width: 95%; }
}