/* =====================================================
   SECURECHAT — style.css
   Databázové systémy 2026 — Zadanie č. 31
===================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Syne:wght@400;600;700;800&display=swap');

/* =====================================================
   RESET & CSS premenne
===================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:          #0a0b0e;
  --surface:     #111318;
  --surface2:    #181c24;
  --border:      #1f2535;
  --border2:     #2a3145;
  --text:        #e8ecf4;
  --text-muted:  #6b7a99;
  --accent:      #4f8ef7;
  --accent-dim:  #1e3a6e;
  --danger:      #ef4444;
  --success:     #22c55e;
  --warn:        #f59e0b;
  --mono:        'DM Mono', monospace;
  --sans:        'Syne', sans-serif;
  --radius:      10px;
  --shadow:      0 4px 24px rgba(0,0,0,0.4);
}

html { font-size: 15px; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* =====================================================
   AUTH SCREEN
===================================================== */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, #0f1a3a 0%, var(--bg) 70%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px;
  box-shadow: 0 0 80px rgba(79,142,247,0.08), var(--shadow);
  animation: slideUp .4s ease;
}

.auth-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 28px;
}

.logo-badge {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 6px 12px;
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-muted);
  letter-spacing: .05em;
}

.logo-sep {
  color: var(--border2);
  font-size: 1.2rem;
}

.auth-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -.03em;
  margin-bottom: 4px;
}
.auth-title span { color: var(--accent); }

.auth-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: .82rem;
  font-family: var(--mono);
  margin-bottom: 32px;
}

/* Tabs */
.tabs {
  display: flex;
  background: var(--bg);
  border-radius: 8px;
  padding: 4px;
  margin-bottom: 24px;
  gap: 4px;
}

.tab-btn {
  flex: 1;
  padding: 8px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--sans);
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.tab-btn.active {
  background: var(--surface2);
  color: var(--text);
  box-shadow: 0 1px 6px rgba(0,0,0,0.3);
}

/* Form */
.form-group { margin-bottom: 14px; }

.form-group label {
  display: block;
  font-size: .75rem;
  font-family: var(--mono);
  color: var(--text-muted);
  margin-bottom: 6px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.form-group input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text);
  font-family: var(--mono);
  font-size: .9rem;
  outline: none;
  transition: border-color .2s;
}
.form-group input:focus { border-color: var(--accent); }

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: var(--sans);
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .2s, transform .15s;
  margin-top: 8px;
}
.btn-primary:hover  { opacity: .9; transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.msg-feedback {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: .83rem;
  font-family: var(--mono);
  display: none;
}
.msg-feedback.error   { background: #2a1515; color: var(--danger); border: 1px solid #5a2020; }
.msg-feedback.success { background: #0f2a1a; color: var(--success); border: 1px solid #1a5a30; }

.demo-hint {
  text-align: center;
  margin-top: 14px;
  font-size: .75rem;
  color: var(--text-muted);
  font-family: var(--mono);
}
.demo-hint strong { color: var(--text); }

/* =====================================================
   APP LAYOUT
===================================================== */
#app-screen {
  display: none;
  height: 100vh;
  overflow: hidden;
}

.app-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: 52px 1fr;
  height: 100vh;
}

/* ---- TOPBAR ---- */
.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 16px;
  z-index: 10;
}

.topbar-brand {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -.02em;
}
.topbar-brand span { color: var(--accent); }

.topbar-logos {
  display: flex;
  gap: 8px;
  margin-left: auto;
  align-items: center;
}

.topbar-badge {
  font-family: var(--mono);
  font-size: .65rem;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 3px 8px;
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 20px;
  padding: 4px 12px 4px 6px;
  cursor: default;
  transition: border-color .2s;
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .75rem;
  color: #fff;
  flex-shrink: 0;
}

.user-pill-name {
  font-size: .8rem;
  font-weight: 600;
}

.btn-logout {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color .2s;
}
.btn-logout:hover { color: var(--danger); }

/* ---- SIDEBAR ---- */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.sidebar-tab {
  flex: 1;
  padding: 10px 6px;
  text-align: center;
  font-size: .72rem;
  font-family: var(--mono);
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color .2s, border-bottom-color .2s;
}
.sidebar-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.sidebar-search {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
}

.sidebar-search input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 6px 10px;
  color: var(--text);
  font-family: var(--mono);
  font-size: .8rem;
  outline: none;
  transition: border-color .2s;
}
.sidebar-search input:focus { border-color: var(--accent); }

.sort-btn {
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 6px;
  color: var(--text-muted);
  font-size: .72rem;
  padding: 6px 8px;
  cursor: pointer;
  font-family: var(--mono);
  white-space: nowrap;
  transition: color .2s, border-color .2s;
}
.sort-btn:hover { color: var(--accent); border-color: var(--accent); }

.user-list {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}

.user-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background .15s;
}
.user-list-item:hover  { background: var(--surface2); }
.user-list-item.active { background: var(--accent-dim); }

.user-info      { flex: 1; min-width: 0; }
.user-display   { font-size: .83rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-meta      { font-size: .7rem; font-family: var(--mono); color: var(--text-muted); }

/* ---- MAIN AREA ---- */
.main-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

/* ---- DASHBOARD ---- */
#pane-dashboard {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: none;
}
#pane-dashboard.visible { display: block; }

.dash-title {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -.03em;
  margin-bottom: 20px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  transition: border-color .2s;
}
.stat-card:hover { border-color: var(--accent); }

.stat-label {
  font-size: .7rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 8px;
}

.stat-value         { font-size: 2rem; font-weight: 800; letter-spacing: -.04em; }
.stat-value.blue    { color: var(--accent); }
.stat-value.green   { color: var(--success); }
.stat-value.red     { color: var(--danger); }
.stat-value.yellow  { color: var(--warn); }

.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 24px;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.chart-title {
  font-size: .75rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: 16px;
}

.logs-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.logs-title {
  font-size: .75rem;
  font-family: var(--mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: 14px;
}

.log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .78rem;
  font-family: var(--mono);
}
.log-table th {
  text-align: left;
  padding: 8px 12px;
  color: var(--text-muted);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.log-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.log-table tr:last-child td { border-bottom: none; }

.log-type {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
}
.lt-login_fail          { background: #3a1e1e; color: #ff7070; }
.lt-brute_force         { background: #3a2a10; color: #ffa040; }
.lt-intercept_attempt   { background: #2a1a3a; color: #c070ff; }
.lt-unauthorized_access { background: #1e2a3a; color: #70aaff; }

/* ---- CHAT PANE ---- */
#pane-chat {
  flex: 1;
  display: none;
  flex-direction: column;
  overflow: hidden;
}
#pane-chat.visible { display: flex; }

.chat-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.chat-header-name { font-weight: 700; font-size: .95rem; }
.chat-header-meta { font-size: .75rem; font-family: var(--mono); color: var(--text-muted); }

.btn-block {
  margin-left: auto;
  background: none;
  border: 1px solid var(--border2);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: .75rem;
  font-family: var(--mono);
  cursor: pointer;
  transition: all .2s;
}
.btn-block:hover { border-color: var(--danger); color: var(--danger); }

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}

.msg-bubble          { max-width: 70%; animation: fadeIn .2s ease; }
.msg-bubble.mine     { align-self: flex-end; }
.msg-bubble.theirs   { align-self: flex-start; }

.msg-inner {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: .87rem;
  line-height: 1.5;
  word-break: break-word;
}
.mine   .msg-inner { background: var(--accent); color: #fff; border-bottom-right-radius: 3px; }
.theirs .msg-inner { background: var(--surface2); border: 1px solid var(--border2); border-bottom-left-radius: 3px; }

.msg-time {
  font-size: .65rem;
  font-family: var(--mono);
  color: var(--text-muted);
  margin-top: 4px;
  text-align: right;
}
.theirs .msg-time { text-align: left; }

.chat-input-area {
  padding: 14px 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--text);
  font-family: var(--sans);
  font-size: .87rem;
  outline: none;
  resize: none;
  max-height: 120px;
  transition: border-color .2s;
}
.chat-input:focus { border-color: var(--accent); }

.btn-send {
  background: var(--accent);
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  color: #fff;
  font-weight: 700;
  font-size: .87rem;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .2s;
}
.btn-send:hover { opacity: .85; }

/* ---- EMPTY STATE ---- */
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 12px;
  font-family: var(--mono);
}
.empty-icon { font-size: 3rem; opacity: .3; }
.empty-text { font-size: .85rem; }

/* ---- MODAL ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 14px;
  padding: 28px;
  width: 340px;
  animation: slideUp .2s ease;
  box-shadow: var(--shadow);
}
.modal h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }

.modal input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--text);
  font-family: var(--mono);
  font-size: .85rem;
  outline: none;
  margin-bottom: 12px;
  transition: border-color .2s;
}
.modal input:focus { border-color: var(--accent); }

.modal-btns { display: flex; gap: 10px; margin-top: 4px; }

.btn-cancel {
  flex: 1;
  padding: 10px;
  background: var(--bg);
  border: 1px solid var(--border2);
  border-radius: 8px;
  color: var(--text-muted);
  font-family: var(--sans);
  font-size: .87rem;
  cursor: pointer;
  transition: border-color .2s;
}
.btn-cancel:hover { border-color: var(--text-muted); }

.btn-danger {
  flex: 1;
  padding: 10px;
  background: var(--danger);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-family: var(--sans);
  font-size: .87rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .2s;
}
.btn-danger:hover { opacity: .85; }

/* =====================================================
   ANIMATIONS
===================================================== */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* =====================================================
   SCROLLBAR
===================================================== */
::-webkit-scrollbar       { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

/* =====================================================
   RESPONSIVE
===================================================== */
@media (max-width: 768px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 52px 200px 1fr;
  }
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    height: 200px;
  }
  .stats-grid  { grid-template-columns: 1fr 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  .topbar-logos { display: none; }
}

@media (max-width: 480px) {
  .auth-card { padding: 28px 20px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-value { font-size: 1.5rem; }
}