/* =============================================
   Smart Room Allocation System — Stylesheet
   Clean, minimal, institutional design
   ============================================= */

:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-light: #eff6ff;
  --blue-mid: #dbeafe;
  --grey-100: #f8fafc;
  --grey-200: #f1f5f9;
  --grey-300: #e2e8f0;
  --grey-400: #cbd5e1;
  --grey-500: #94a3b8;
  --grey-600: #64748b;
  --grey-700: #475569;
  --grey-800: #1e293b;
  --grey-900: #0f172a;
  --white: #ffffff;
  --green: #16a34a;
  --green-light: #dcfce7;
  --red: #dc2626;
  --red-light: #fee2e2;
  --amber: #d97706;
  --amber-light: #fef3c7;
  --sidebar-w: 220px;
  --font-sans: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

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

body {
  font-family: var(--font-sans);
  background: var(--grey-100);
  color: var(--grey-800);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.6;
}

.content-wrapper {
  display: flex;
  flex: 1;
}

/* ─── SIDEBAR ─────────────────────────────────── */

.sidebar {
  width: var(--sidebar-w);
  background: var(--grey-900);
  color: var(--white);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: 24px 20px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: var(--blue);
  color: white;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  line-height: 1.2;
}

.logo-sub {
  font-size: 10px;
  color: var(--grey-500);
  line-height: 1.2;
}

.nav-links {
  padding: 16px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 6px;
  color: var(--grey-400);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 400;
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
}

.nav-item:hover {
  background: rgba(255,255,255,0.06);
  color: var(--white);
}

.nav-item.active {
  background: var(--blue);
  color: var(--white);
}

.nav-icon {
  font-size: 14px;
  width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.version-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--grey-600);
}

/* ─── MAIN CONTENT ───────────────────────────── */

.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 32px 36px;
  min-height: 100vh;
}

/* ─── PAGES ──────────────────────────────────── */

.page {
  display: none;
}

.page.active {
  display: block;
}

.page-header {
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--grey-300);
}

.page-header h1 {
  font-size: 22px;
  font-weight: 600;
  color: var(--grey-900);
  letter-spacing: -0.3px;
}

.page-sub {
  font-size: 13px;
  color: var(--grey-500);
  margin-top: 4px;
}

/* ─── HOME PAGE ──────────────────────────────── */

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.overview-card {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  padding: 20px;
}

.overview-card.wide {
  grid-column: 1 / -1;
}

.overview-card h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--grey-900);
}

.overview-card h3 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--grey-700);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.overview-card p {
  font-size: 13.5px;
  color: var(--grey-600);
  line-height: 1.65;
}

.info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-list li {
  font-size: 13px;
  color: var(--grey-700);
  display: flex;
  align-items: center;
  gap: 8px;
}

.tag {
  display: inline-block;
  background: var(--blue-mid);
  color: var(--blue-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  white-space: nowrap;
}

.quickstart-bar {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.quickstart-bar span {
  color: var(--grey-600);
  font-size: 13px;
  margin-right: 4px;
}

/* ─── BUTTONS ────────────────────────────────── */

.btn {
  padding: 8px 16px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
}

.btn-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.btn-outline {
  background: transparent;
  color: var(--blue);
  border-color: var(--blue);
}

.btn-outline:hover {
  background: var(--blue-light);
}

.btn-ghost {
  background: transparent;
  color: var(--grey-600);
  border-color: var(--grey-300);
}

.btn-ghost:hover {
  background: var(--grey-200);
}

.btn-danger {
  background: var(--red-light);
  color: var(--red);
  border-color: transparent;
}

.btn-danger:hover {
  background: #fca5a5;
}

.btn-small {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-large {
  padding: 11px 28px;
  font-size: 14px;
}

/* ─── TWO COLUMN LAYOUT ──────────────────────── */

.two-col {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  align-items: start;
}

/* ─── FORM CARD ──────────────────────────────── */

.form-card {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  padding: 22px;
}

.form-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
  color: var(--grey-800);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grey-200);
}

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

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--grey-700);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.hint {
  font-size: 11px;
  color: var(--grey-400);
  text-transform: none;
  font-weight: 400;
  letter-spacing: 0;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 8px 11px;
  border: 1px solid var(--grey-300);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--grey-800);
  background: var(--white);
  transition: border-color 0.15s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-actions {
  margin-top: 18px;
  display: flex;
  gap: 8px;
}

/* ─── LIST CARD ──────────────────────────────── */

.list-card {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  overflow: hidden;
}

.list-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--grey-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.list-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--grey-800);
  display: flex;
  align-items: center;
  gap: 8px;
}

.count-badge {
  background: var(--blue-mid);
  color: var(--blue-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 10px;
}

.search-input {
  padding: 6px 10px;
  border: 1px solid var(--grey-300);
  border-radius: 5px;
  font-family: var(--font-sans);
  font-size: 12px;
  width: 140px;
  outline: none;
}

.search-input:focus {
  border-color: var(--blue);
}

.record-list {
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 520px;
  overflow-y: auto;
}

.record-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border: 1px solid var(--grey-200);
  border-radius: 6px;
  background: var(--grey-100);
  gap: 10px;
}

.record-item:hover {
  border-color: var(--grey-300);
  background: var(--grey-200);
}

.record-info {
  flex: 1;
}

.record-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--grey-800);
}

.record-meta {
  font-size: 11.5px;
  color: var(--grey-500);
  margin-top: 2px;
}

.record-actions {
  display: flex;
  gap: 5px;
  flex-shrink: 0;
}

.empty-state {
  text-align: center;
  color: var(--grey-400);
  font-size: 13px;
  padding: 32px 16px;
}

/* ─── ALLOCATE PAGE ──────────────────────────── */

.allocate-center {
  max-width: 640px;
}

.algo-info-card {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  padding: 22px;
  margin-bottom: 20px;
}

.algo-info-card h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
  color: var(--grey-800);
}

.algo-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.algo-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.step-num {
  width: 26px;
  height: 26px;
  background: var(--blue);
  color: white;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.step-text {
  font-size: 13px;
  color: var(--grey-600);
  padding-top: 3px;
  line-height: 1.55;
}

.stats-row {
  display: flex;
  gap: 14px;
  margin-bottom: 20px;
}

.stat-box {
  flex: 1;
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  padding: 16px;
  text-align: center;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--blue);
}

.stat-label {
  font-size: 11px;
  color: var(--grey-500);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.alloc-message {
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 13px;
  margin-bottom: 20px;
  border: 1px solid transparent;
}

.alloc-message.success {
  background: var(--green-light);
  color: var(--green);
  border-color: #86efac;
}

.alloc-message.error {
  background: var(--red-light);
  color: var(--red);
  border-color: #fca5a5;
}

.alloc-message.warning {
  background: var(--amber-light);
  color: var(--amber);
  border-color: #fcd34d;
}

.alloc-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ─── RESULTS PAGE ───────────────────────────── */

.empty-state-full {
  text-align: center;
  padding: 60px 20px;
  color: var(--grey-500);
}

.empty-state-full p {
  margin-bottom: 16px;
}

.result-stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.result-stat-pill {
  padding: 6px 14px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--font-mono);
}

.result-stat-pill.blue {
  background: var(--blue-mid);
  color: var(--blue-dark);
}

.result-stat-pill.green {
  background: var(--green-light);
  color: var(--green);
}

.result-stat-pill.red {
  background: var(--red-light);
  color: var(--red);
}

.table-wrapper {
  background: var(--white);
  border: 1px solid var(--grey-300);
  border-radius: 8px;
  overflow: auto;
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.result-table thead th {
  background: var(--grey-100);
  color: var(--grey-600);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--grey-300);
  text-align: left;
  white-space: nowrap;
}

.result-table tbody tr {
  border-bottom: 1px solid var(--grey-200);
  transition: background 0.1s;
}

.result-table tbody tr:last-child {
  border-bottom: none;
}

.result-table tbody tr:hover {
  background: var(--blue-light);
}

.result-table td {
  padding: 10px 14px;
  color: var(--grey-700);
}

.result-table td:first-child {
  color: var(--grey-400);
  font-family: var(--font-mono);
  font-size: 11px;
}

.score-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
}

.score-high { background: var(--green-light); color: var(--green); }
.score-mid  { background: var(--amber-light); color: var(--amber); }
.score-low  { background: var(--grey-200); color: var(--grey-600); }

.type-badge {
  display: inline-block;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 3px;
  font-weight: 500;
}

.type-ac     { background: var(--blue-mid); color: var(--blue-dark); }
.type-nonac  { background: var(--grey-200); color: var(--grey-700); }

/* ─── TOAST ──────────────────────────────────── */

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--grey-900);
  color: white;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 13px;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  max-width: 320px;
}

.toast.show {
  opacity: 1;
}

/* ─── SCROLLBAR ──────────────────────────────── */

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--grey-200); }
::-webkit-scrollbar-thumb { background: var(--grey-400); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--grey-500); }

/* ─── RESPONSIVE ─────────────────────────────── */

@media (max-width: 900px) {
  .two-col {
    grid-template-columns: 1fr;
  }
  .main-content {
    padding: 24px 20px;
  }
  .overview-grid {
    grid-template-columns: 1fr;
  }
  .stats-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

@media (max-width: 768px) {
  .content-wrapper {
    flex-direction: column;
  }
  
  .sidebar {
    display: none;
  }
  
  .mobile-nav {
    display: block;
  }
  
  .main-content {
    margin-left: 0;
    padding: 16px;
    padding-top: 80px;
  }
  
  .page-header h1 {
    font-size: 24px;
  }
  
  .form-card, .list-card {
    padding: 20px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .quickstart-bar {
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
  }
  
  .btn-large {
    width: 100%;
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 12px;
    padding-top: 80px;
  }
  
  .page-header {
    margin-bottom: 20px;
  }
  
  .page-header h1 {
    font-size: 20px;
  }
  
  .page-sub {
    font-size: 13px;
  }
  
  .form-card, .list-card {
    padding: 16px;
    margin-bottom: 16px;
  }
  
  .form-group {
    margin-bottom: 16px;
  }
  
  .btn {
    padding: 10px 16px;
    font-size: 13px;
  }
  
  .record-item {
    padding: 12px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .record-actions {
    width: 100%;
    display: flex;
    gap: 8px;
  }
  
  .record-actions .btn {
    flex: 1;
  }
  
  .alloc-actions {
    flex-direction: column;
    gap: 12px;
  }
  
  .alloc-actions .btn {
    width: 100%;
  }
  
  .result-table {
    font-size: 12px;
  }
  
  .result-table th,
  .result-table td {
    padding: 8px 4px;
  }
  
  .overview-card {
    padding: 16px;
  }
  
  .overview-card h2 {
    font-size: 18px;
  }
  
  .overview-card h3 {
    font-size: 16px;
  }
  
  .algo-info-card {
    padding: 16px;
  }
  
  .algo-step {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }
}

/* ─── MOBILE NAVIGATION ─────────────────────────── */

.mobile-nav {
  display: none;
  background: var(--grey-900);
  color: var(--white);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* For testing - show mobile nav on desktop when screen is small */
@media (max-width: 768px) {
  .mobile-nav {
    display: block;
  }
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--grey-700);
}

.mobile-logo {
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--white);
}

.mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background: var(--white);
  transition: all 0.3s ease;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.mobile-nav-menu {
  display: none;
  background: var(--grey-800);
}

.mobile-nav-menu.active {
  display: block;
}

.mobile-nav-item {
  display: block;
  padding: 16px 20px;
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--grey-700);
  transition: background-color 0.2s ease;
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
  background: var(--grey-700);
}

.mobile-nav-item.active {
  border-left: 3px solid var(--blue);
  padding-left: 17px;
}

/* ─── FOOTER ─────────────────────────────────── */

.main-footer {
  background: var(--grey-200);
  border-top: 1px solid var(--grey-300);
  padding: 16px 0;
  text-align: center;
  margin-top: auto;
}

.footer-content {
  color: var(--grey-600);
  font-size: 13px;
  font-family: var(--font-mono);
}

.footer-content p {
  margin: 4px 0;
}

.powered-by {
  font-size: 12px;
  margin-top: 8px;
}

.footer-content a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-content a:hover {
  color: var(--blue-dark);
  text-decoration: underline;
}