/* platform.css — Shell layout: variables, sidebar, top-bar, responsive. */
/* Page-level styles (cards, empty states, placeholders) live in pages.css. */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  --navy-900: #070d18;
  --navy-800: #0c1829;
  --navy-700: #132240;
  --navy-600: #1a2d52;
  --navy-500: #243b6a;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --white: #ffffff;
  --accent-blue: #3b82f6;
  --accent-blue-dim: rgba(59, 130, 246, 0.12);
  --accent-amber: #f59e0b;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --sidebar-w: 240px;
  --header-h: 56px;
  --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-en: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  font-size: 14px;
  line-height: 1.6;
  color: var(--slate-600);
  background: var(--slate-100);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  height: 100vh;
}

/* ── LAYOUT SHELL ─────────────────────────────── */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── SIDEBAR ──────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--navy-800);
  color: var(--white);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s var(--ease);
  z-index: 40;
}
.sidebar-brand {
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  gap: 10px;
}
.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent-blue), #6366f1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  flex-shrink: 0;
}
.brand-text {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand-sub {
  font-size: 10px;
  color: var(--slate-400);
  letter-spacing: 0.04em;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
}
.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-400);
  padding: 16px 20px 8px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--slate-300);
  cursor: pointer;
  transition: all 0.15s var(--ease);
  font-size: 13.5px;
  font-weight: 400;
  border-left: 3px solid transparent;
  text-decoration: none;
}
.nav-item:hover {
  background: rgba(255,255,255,0.05);
  color: var(--white);
}
.nav-item.active {
  background: rgba(59, 130, 246, 0.1);
  color: var(--white);
  border-left-color: var(--accent-blue);
  font-weight: 500;
}
.nav-item .nav-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}
.nav-item .nav-badge {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  color: var(--slate-400);
  font-weight: 500;
}
.nav-item .nav-badge.soon {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
}

/* Sub-navigation (procurement sub-modules) */
.nav-sub {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s var(--ease);
}
.nav-sub.expanded { max-height: 300px; }
.nav-sub .nav-item {
  padding-left: 54px;
  font-size: 13px;
}

/* ── MAIN CONTENT AREA ────────────────────────── */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Top header bar */
.top-bar {
  height: var(--header-h);
  background: var(--white);
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  flex-shrink: 0;
}
.top-bar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--slate-500);
  cursor: pointer;
  padding: 4px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--slate-400);
}
.breadcrumb .bc-current { color: var(--slate-600); font-weight: 500; }
.breadcrumb .bc-link {
  color: var(--slate-400);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s var(--ease);
}
.breadcrumb .bc-link:hover { color: var(--accent-blue); }
.breadcrumb .bc-sep { color: var(--slate-300); margin: 0 2px; }

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.agent-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid rgba(59,130,246,0.2);
  cursor: pointer;
  transition: all 0.15s var(--ease);
}
.agent-btn:hover {
  background: rgba(59,130,246,0.18);
  border-color: rgba(59,130,246,0.35);
}
.agent-btn .pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--navy-700);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

/* ── PAGE CONTENT ─────────────────────────────── */
.page-content {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

/* ── RESPONSIVE ───────────────────────────────── */
@media (max-width: 1024px) {
  .sidebar { position: fixed; top: 0; left: 0; bottom: 0; transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: block; }
  .direction-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}
@media (max-width: 640px) {
  .page-content { padding: 16px; }
  .direction-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .top-bar { padding: 0 16px; }
}

/* ── SIDEBAR OVERLAY (mobile) ─────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 35;
}
@media (max-width: 1024px) {
  .sidebar-overlay.open { display: block; }
}