/* ==========================================
   CSS STYLES - KINGSTONVN DEMAND CENTER v2
   Theme: Pencil / Slate Light UI (Sáng màu thanh lịch)
   ========================================== */

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;

  /* Color Palette - Sáng màu thanh lịch v2 */
  --paper-bg: #f8fafc;
  --paper-white: #ffffff;
  --pencil-color: #0f172a;
  --pencil-muted: #64748b;
  --pencil-light: #94a3b8;
  --border-color: #e2e8f0;
  
  --ink-blue: #2563eb;
  --ink-blue-bg: #eff6ff;
  --ink-green: #16a34a;
  --ink-green-bg: #f0fdf4;
  --ink-orange: #ea580c;
  --ink-orange-bg: #fff7ed;
  --ink-red: #dc2626;
  --ink-red-bg: #fef2f2;
  --ink-purple: #9333ea;
  --ink-purple-bg: #faf5ff;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-card: 3px 3px 0px var(--pencil-color);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--paper-bg);
  color: var(--pencil-color);
  line-height: 1.5;
  padding: 24px;
  -webkit-font-smoothing: antialiased;
}

/* HEADER */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-card);
}

.title-area h1 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--pencil-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-area p {
  font-size: 0.85rem;
  color: var(--pencil-muted);
  margin-top: 4px;
}

.btn-nav-group {
  display: flex;
  gap: 10px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--paper-white);
  color: var(--pencil-color);
  border: 2px solid var(--pencil-color);
  border-radius: 8px;
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 2px 2px 0px var(--pencil-color);
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--pencil-color);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--pencil-color);
}

.btn-blue {
  background: var(--ink-blue-bg);
  color: var(--ink-blue);
  border-color: var(--ink-blue);
  box-shadow: 2px 2px 0px var(--ink-blue);
}

.btn-green {
  background: var(--ink-green-bg);
  color: var(--ink-green);
  border-color: var(--ink-green);
  box-shadow: 2px 2px 0px var(--ink-green);
}

.btn-orange {
  background: var(--ink-orange-bg);
  color: var(--ink-orange);
  border-color: var(--ink-orange);
  box-shadow: 2px 2px 0px var(--ink-orange);
}

.btn-danger {
  background: var(--ink-red-bg);
  color: var(--ink-red);
  border-color: var(--ink-red);
  box-shadow: 2px 2px 0px var(--ink-red);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

/* TAB NAVIGATION */
.tabs-nav {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.tab-btn {
  background: var(--paper-white);
  color: var(--pencil-muted);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  padding: 10px 18px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn.active {
  color: var(--pencil-color);
  border-color: var(--pencil-color);
  box-shadow: var(--shadow-card);
  background: var(--paper-white);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* GRID LAYOUT */
.sa-ban-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.1fr;
  gap: 20px;
}

@media (max-width: 1200px) {
  .sa-ban-grid {
    grid-template-columns: 1fr;
  }
}

.col {
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.col-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
}

.col-header h3 {
  font-size: 1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  border: 1.5px solid var(--pencil-color);
}

.badge-blue { background: var(--ink-blue-bg); color: var(--ink-blue); border-color: var(--ink-blue); }
.badge-green { background: var(--ink-green-bg); color: var(--ink-green); border-color: var(--ink-green); }
.badge-orange { background: var(--ink-orange-bg); color: var(--ink-orange); border-color: var(--ink-orange); }
.badge-red { background: var(--ink-red-bg); color: var(--ink-red); border-color: var(--ink-red); }
.badge-purple { background: var(--ink-purple-bg); color: var(--ink-purple); border-color: var(--ink-purple); }
.badge-gray { background: #f1f5f9; color: var(--pencil-muted); border-color: var(--pencil-light); }

/* TABLES */
.inv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  margin-top: 8px;
}

.inv-table th {
  background: #f1f5f9;
  color: var(--pencil-color);
  font-weight: 800;
  text-align: left;
  padding: 8px 10px;
  border-bottom: 2px solid var(--pencil-color);
}

.inv-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.inv-table tr:last-child td {
  border-bottom: none;
}

/* CARDS & BOXES */
.box-card {
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 12px;
  box-shadow: 2px 2px 0px var(--pencil-color);
}

.box-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 800;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

/* PROGRESS BAR */
.progress-bar-container {
  background: #e2e8f0;
  border: 1.5px solid var(--pencil-color);
  border-radius: 8px;
  height: 18px;
  position: relative;
  overflow: hidden;
  margin: 6px 0;
}

.progress-bar-fill {
  background: var(--ink-green);
  height: 100%;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-bar-text {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--pencil-color);
  font-family: var(--font-mono);
}

/* ALERT BOXES */
.alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 10px;
  border: 2px solid var(--pencil-color);
}

.alert-success { background: var(--ink-green-bg); color: var(--ink-green); border-color: var(--ink-green); }
.alert-warning { background: var(--ink-orange-bg); color: var(--ink-orange); border-color: var(--ink-orange); }
.alert-info { background: var(--ink-blue-bg); color: var(--ink-blue); border-color: var(--ink-blue); }

/* SYSTEM LAYOUT WITH SIDEBAR */
#app-layout {
  display: flex;
  gap: 24px;
  max-width: 1600px;
  margin: 0 auto;
}

.system-sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--paper-white);
  border: 2px solid var(--pencil-color);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 24px;
  height: fit-content;
}

.sidebar-logo {
  font-size: 1rem;
  font-weight: 800;
  color: var(--pencil-color);
  border-bottom: 2px dashed var(--pencil-color);
  padding-bottom: 12px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-menu a {
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--pencil-muted);
  padding: 10px 14px;
  border-radius: 8px;
  border: 1.5px solid transparent;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-menu a:hover {
  color: var(--pencil-color);
  border-color: var(--pencil-color);
  background: var(--paper-bg);
}

.sidebar-menu a.active {
  color: var(--ink-blue);
  background: var(--ink-blue-bg);
  border-color: var(--ink-blue);
}

.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}