html {
  font-size: 62.5%;
}

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

/* ===== CSS VARIABLES FOR THEMING ===== */
:root {
  /* Light Mode (default) */
  --bg-primary: #f0f4f5;
  --bg-secondary: #ffffff;
  --text-primary: #212b32;
  --text-secondary: #4c6272;
  --accent-primary: #005eb8;
  --accent-secondary: #003d78;
  --accent-tertiary: #005eb8;
  --border-color: #d8dde0;
  --panel-bg: #ffffff;
  --panel-hover-bg: #e6eff8;
  --input-bg: #ffffff;
  --input-border: #4c6272;
  --header-toggle-bg: transparent;
  --header-toggle-color: #ffffff;
  --header-toggle-hover: rgba(255, 255, 255, 0.15);
  --button-secondary-bg: #ffffff;
  --button-secondary-color: #005eb8;
  --button-secondary-hover: #e6eff8;
  --focus-outline: #ffeb3b;
  --sidebar-bg: #ffffff;
  --sidebar-text: #212b32;
  --sidebar-active: #005eb8;
  --error-color: #d5281b;
  --success-color: #007f3b;
  --warning-color: #ffb81c;
  --info-color: #005eb8;

  /* Healthcare Status Colors */
  --status-online: #007f3b;
  --status-offline: #d5281b;
  --status-error: #ffb81c;
  --status-pending: #ffb81c;
  --status-offered: #005eb8;
  --status-booked: #007f3b;
  --status-rejected: #d5281b;
  --status-urgent: #d5281b;
  --status-priority: #ffb81c;
  --status-standard: #4c6272;

  /* Appointment specific colors */
  --appointment-urgent-bg: #f9e5e4;
  --appointment-priority-bg: #fff4cc;
  --appointment-standard-bg: #f5f7fa;

  /* Flow status colors */
  --flow-waiting: #ffb81c;
  --flow-consultation: #005eb8;
  --flow-finished: #007f3b;
  --flow-overdue: #d5281b;
  --flow-dna: #d5281b;
}

/* Dark Mode */
.dark-mode {
  --bg-primary: #1e293b;
  --bg-secondary: rgba(0, 0, 0, 0.5);
  --text-primary: #ffffff;
  --text-secondary: #e6e6e6;
  --accent-primary: #3b82f6;
  --accent-secondary: #60a5fa;
  --accent-tertiary: #7c93ff;
  --border-color: transparent;
  --panel-bg: rgba(255,255,255,0.1);
  --panel-hover-bg: rgba(255,255,255,0.15);
  --input-bg: rgba(255,255,255,0.1);
  --input-border: rgba(255,255,255,0.2);
  --header-toggle-bg: #3b82f6;
  --header-toggle-color: #ffffff;
  --header-toggle-hover: #005eb8;
  --button-secondary-bg: rgba(255,255,255,0.1);
  --button-secondary-color: #ffffff;
  --button-secondary-hover: rgba(255,255,255,0.2);
  --focus-outline: #60a5fa;
  --sidebar-bg: rgba(0, 0, 0, 0.4);
  --sidebar-text: #e6e6e6;
  --sidebar-active: #ffffff;
  --error-color: #fca5a5;
  --success-color: #4ade80;
  --warning-color: #fcd34d;
  --info-color: #38bdf8;

  /* Healthcare Status Colors - Dark Mode */
  --status-online: #4ade80;
  --status-offline: #fca5a5;
  --status-error: #fcd34d;
  --status-pending: #fcd34d;
  --status-offered: #38bdf8;
  --status-booked: #4ade80;
  --status-rejected: #fca5a5;
  --appointment-urgent-bg: rgba(252, 165, 165, 0.1);
  --appointment-priority-bg: rgba(252, 211, 77, 0.1);
  --appointment-standard-bg: rgba(255,255,255,0.05);
}

/* High Contrast Mode */
.high-contrast-mode {
  --bg-primary: #000000;
  --bg-secondary: #121212;
  --text-primary: #ffffff;
  --text-secondary: #ffffff;
  --accent-primary: #ffff00;
  --accent-secondary: #ffff99;
  --accent-tertiary: #ffff00;
  --border-color: #ffffff;
  --panel-bg: #121212;
  --panel-hover-bg: #333333;
  --input-bg: #000000;
  --input-border: #ffffff;
  --focus-outline: #ffff00;
  --sidebar-bg: #121212;
  --sidebar-text: #ffffff;
  --sidebar-active: #ffff00;
  --error-color: #ff6666;
  --success-color: #33ff33;
  --warning-color: #ffff00;
  --info-color: #33ffff;
  --status-online: #33ff33;
  --status-offline: #ff6666;
  --status-error: #ffff00;
  --status-pending: #ffff00;
  --status-offered: #33ffff;
  --status-booked: #33ff33;
  --status-rejected: #ff6666;
}

/* ===== BASE BODY STYLES ===== */
body {
  font-family: "Frutiger", Arial, sans-serif;
  font-size: 1.9rem;
  color: var(--text-secondary);
  background: var(--bg-primary);
  line-height: 1.5;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

@media screen and (max-width: 768px) {
  body {
    font-size: 1.6rem;
  }
}

.dark-mode {
  background: #0b0c0c;
}

.high-contrast-mode {
  background: #000000;
}

/* ===== MAIN CONTAINER ===== */
.dash {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: none;
  transition: background 0.3s;
}

.dark-mode .dash {
  background: rgba(0, 0, 0, 0.5);
}

/* ===== HEADER ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 6rem;
  background: var(--accent-primary);
  border-bottom: none;
  padding: 0 1.6rem;
  transition: background 0.3s;
  position: relative;
  z-index: 100;
}

.header__heading {
  display: flex;
  align-items: center;
  margin-right: 2rem;
}

.header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nhs-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ffffff;
  border: 2px solid #ffffff;
  padding: 0.2rem 0.6rem;
  font-size: 1.3rem;
  text-transform: uppercase;
}

.header__logo img {
  filter: brightness(0) invert(1);
}

.header__logo-icon {
  width: 2.4rem;
  height: 2.4rem;
  margin-right: 0.8rem;
  color: #ffffff;
  transition: color 0.3s;
}

.header__logo-text {
  font-weight: bold;
  font-size: 1.8rem;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.header__logo:hover .header__logo-icon {
  color: #ffffff;
}

/* Digital Clock */
.digital-clock {
  font-size: 1.7rem;
  font-weight: 600;
  color: #ffffff;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
  background: rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  transition: background 0.3s, color 0.3s;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.header__options {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Theme Toggle */
.theme-toggle {
  background: var(--header-toggle-bg);
  color: var(--header-toggle-color);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 4px;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  transition: background 0.3s, color 0.3s;
  font-size: 1.3rem;
  font-weight: 500;
}

.theme-toggle:hover {
  background: var(--header-toggle-hover);
}

.theme-toggle:focus {
  outline: 4px solid var(--focus-outline);
  outline-offset: 2px;
}

/* API Status */
.status-indicator {
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  position: relative;
  margin-right: 0.5rem;
}

.status-indicator::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.status-online { background: var(--status-online); }
.status-offline { background: var(--status-offline); }
.status-error { background: var(--status-error); }

.status-online::after { background: var(--status-online); }
.status-offline::after { background: var(--status-offline); }
.status-error::after { background: var(--status-error); }

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  70% { transform: scale(1.5); opacity: 0; }
  100% { transform: scale(1.5); opacity: 0; }
}

.api-status {
  display: flex;
  align-items: center;
  font-size: 1.2rem;
  color: #ffffff;
}

/* ===== BODY ===== */
.body {
  flex: 1;
  display: flex;
  width: 100%;
  min-height: calc(100vh - 6rem);
  transition: backdrop-filter 0.3s;
}

.dark-mode .body {
  backdrop-filter: blur(8px);
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 6rem;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  transition: width 0.3s ease, background 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
  z-index: 10;
}

.sidebar.expanded {
  width: 20rem;
}

.dark-mode .sidebar {
  box-shadow: 2px 0 12px rgba(0,0,0,0.5);
}

.sidebar__toggle {
  position: absolute;
  top: 1.2rem;
  right: 0.5rem;
  width: 2rem;
  height: 2rem;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sidebar-text);
  z-index: 20;
  opacity: 0;
  transition: opacity 0.3s, color 0.2s;
}

.sidebar:hover .sidebar__toggle,
.sidebar.expanded .sidebar__toggle {
  opacity: 1;
}

.sidebar__nav {
  list-style: none;
  padding: 2rem 0;
  width: 100%;
}

.sidebar__item {
  margin-bottom: 0.5rem;
  width: 100%;
}

.sidebar__link {
  display: flex;
  align-items: center;
  padding: 1rem;
  color: var(--sidebar-text);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
  width: 20rem;
}

.sidebar__link:hover {
  background-color: var(--panel-hover-bg);
  border-left-color: var(--accent-primary);
  color: var(--sidebar-active);
}

.sidebar__link--active {
  border-left-color: var(--accent-primary);
  color: var(--sidebar-active);
  font-weight: 500;
  background-color: var(--panel-hover-bg);
}

.sidebar__icon {
  width: 2rem;
  height: 2rem;
  margin-right: 2rem;
  flex-shrink: 0;
  margin-left: 0.8rem;
  color: currentColor;
}

.sidebar__text {
  font-size: 1.4rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar:hover:not(.expanded) {
  width: 20rem;
}

/* ===== MAIN CONTENT ===== */
.main {
  flex: 1;
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.main__heading {
  font-size: 3rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.main__desc {
  margin-bottom: 2rem;
  font-size: 1.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== SHARED LAYOUTS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.6rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  background-color: var(--panel-hover-bg);
}

.dark-mode .stat-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.7);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1.3rem;
  color: var(--text-secondary);
}

.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.6rem;
  margin-bottom: 2rem;
}

.action-card {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  transition: background-color 0.3s, border-color 0.3s;
}

.action-header {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.list-header {
  padding: 1.5rem;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border-color);
}

/* ===== SHARED FORM ELEMENTS ===== */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1.7rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 1.2rem;
  border: 2px solid var(--input-border);
  border-radius: 4px;
  font-size: 1.9rem;
  background: var(--input-bg);
  color: var(--text-primary);
  transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
}

.form-textarea {
  min-height: 8rem;
  resize: vertical;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: #000000;
  background: var(--panel-bg);
  box-shadow: 0 0 0 4px var(--focus-outline);
}

.high-contrast-mode .form-input:focus,
.high-contrast-mode .form-select:focus,
.high-contrast-mode .form-textarea:focus {
  box-shadow: 0 0 0 2px var(--accent-primary);
}

/* ===== SHARED BUTTONS ===== */
.btn {
  padding: 1.2rem 2.4rem;
  border: none;
  border-radius: 4px;
  font-size: 1.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  width: 100%;
}

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

.btn-primary:hover {
  background: #006b32;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-color);
  border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
  background: var(--button-secondary-hover);
}

.btn-small {
  padding: 0.6rem 1.2rem;
  font-size: 1.2rem;
  width: auto;
  margin-left: 0.5rem;
}

.btn-success {
  background: var(--success-color);
  color: white;
}

.btn-success:hover {
  background: #006b32;
}

.btn-error {
  background: var(--error-color);
  color: white;
}

.btn-error:hover {
  background: #b91c1c;
}

.btn:focus {
  outline: 4px solid var(--focus-outline);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ===== SHARED STATUS BADGES ===== */
.status-badge {
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-queued {
  background: var(--appointment-priority-bg);
  color: var(--status-pending);
}

.status-offered {
  background: rgba(14, 165, 233, 0.1);
  color: var(--status-offered);
}

.status-booked {
  background: rgba(34, 197, 94, 0.1);
  color: var(--status-booked);
}

.status-cancelled {
  background: rgba(239, 68, 68, 0.1);
  color: var(--status-rejected);
}

.status-closed {
  background: rgba(107, 114, 128, 0.1);
  color: var(--status-standard);
}

/* ===== NOTIFICATION SYSTEM ===== */
.notification {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--panel-bg);
  border-left: 4px solid var(--accent-primary);
  padding: 1.2rem 1.6rem;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 1000;
  max-width: 32rem;
  transform: translateX(110%);
  transition: transform 0.3s ease-out;
  color: var(--text-primary);
}

.notification.show {
  transform: translateX(0);
}

.notification.success {
  border-left-color: var(--success-color);
}

.notification.error {
  border-left-color: var(--error-color);
}

.notification.warning {
  border-left-color: var(--warning-color);
}

.notification.info {
  border-left-color: var(--info-color);
}

/* ===== LOADING ANIMATION ===== */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(59, 130, 246, 0.3);
  border-top: 3px solid var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== UTILITY CLASSES ===== */
.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.2rem;
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.help-text {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  line-height: 1.4;
}

.help-text strong {
  color: var(--text-primary);
}

/* ===== ACCESSIBILITY ===== */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-primary);
  color: white;
  padding: 8px;
  z-index: 1000;
  transition: top 0.3s;
  border-radius: 0 0 4px 0;
}

.skip-link:focus {
  top: 0;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 4px solid var(--focus-outline);
  outline-offset: 2px;
  box-shadow: 0 0 0 2px #000000;
}

a {
  color: var(--accent-primary);
}

/* ===== RESPONSIVE DESIGN ===== */
@media screen and (max-width: 1200px) {
  .actions-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media screen and (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 6rem;
    left: -100%;
    height: calc(100% - 6rem);
    transition: left 0.3s ease;
    z-index: 100;
  }

  .sidebar.mobile-visible {
    left: 0;
  }

  .main {
    padding: 1rem;
  }

  .btn-row {
    grid-template-columns: 1fr;
  }

  .row {
    grid-template-columns: 1fr;
  }

  .digital-clock {
    position: static;
    transform: none;
    margin: 0 1rem;
  }

  .header {
    flex-wrap: wrap;
    height: auto;
    min-height: 6rem;
    padding: 1rem;
  }

  .header__heading {
    margin-right: 0;
  }
}


/* Sidebar footer for accessibility link */
.sidebar__footer {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  border-top: 1px solid var(--border-color);
  background: var(--sidebar-bg);
}

.sidebar__footer-link {
  display: flex;
  align-items: center;
  padding: 1.2rem 1rem;
  color: var(--sidebar-text);
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
  width: 100%;
  font-size: 1.2rem;
  opacity: 0.8;
}

.sidebar__footer-link:hover {
  background-color: var(--panel-hover-bg);
  color: var(--sidebar-active);
  opacity: 1;
}

.sidebar__footer-link .sidebar__text {
  margin-left: 0.8rem;
}