@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-0: #071827;
  --bg-1: #0B2336;
  --card: rgba(255,255,255,0.06);
  --stroke: rgba(255,255,255,0.10);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.65);
  --brand: #16C7C1;
  --brand-2: #2EE6DA;
  --danger: #FF4D4D;
  --ok: #20D07A;
  --warn: #FFB020;
  
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-0);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(var(--stroke) 1px, transparent 1px),
    linear-gradient(90deg, var(--stroke) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.15;
  z-index: -1;
  pointer-events: none;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--brand-2);
}

/* Typography */
h1, h2, h3, h4, h5 {
  font-weight: 600;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; margin-bottom: var(--space-4); }
h2 { font-size: 2rem; margin-bottom: var(--space-4); }
h3 { font-size: 1.5rem; margin-bottom: var(--space-3); }
h4 { font-size: 1.25rem; margin-bottom: var(--space-2); }
p { margin-bottom: var(--space-4); color: var(--muted); }

.text-muted { color: var(--muted); }
.text-brand { color: var(--brand); }
.text-small { font-size: 0.875rem; }

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.w-full { width: 100%; }
.text-center { text-align: center; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--brand);
  color: var(--bg-0);
  font-weight: 600;
}

.btn-primary:hover {
  background-color: var(--brand-2);
  box-shadow: 0 0 15px rgba(22, 199, 193, 0.4);
}

.btn-secondary {
  background-color: var(--card);
  color: var(--text);
  border-color: var(--stroke);
}

.btn-secondary:hover {
  background-color: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
}

.btn-ghost:hover {
  background-color: var(--card);
}

.btn-icon {
  padding: var(--space-2);
}

/* Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.input, .textarea, .select {
  width: 100%;
  background-color: var(--bg-1);
  border: 1px solid var(--stroke);
  color: var(--text);
  padding: var(--space-3);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: border-color 0.2s;
}

.input:focus, .textarea:focus, .select:focus {
  outline: none;
  border-color: var(--brand);
}

.textarea {
  resize: vertical;
  min-height: 100px;
}

/* Cards & Glassmorphism */
.card {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: var(--space-5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.5;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-ok { background: rgba(32, 208, 122, 0.15); color: var(--ok); border: 1px solid rgba(32, 208, 122, 0.3); }
.badge-warn { background: rgba(255, 176, 32, 0.15); color: var(--warn); border: 1px solid rgba(255, 176, 32, 0.3); }
.badge-danger { background: rgba(255, 77, 77, 0.15); color: var(--danger); border: 1px solid rgba(255, 77, 77, 0.3); }
.badge-neutral { background: var(--stroke); color: var(--text); border: 1px solid var(--stroke); }
.badge-brand { background: rgba(22, 199, 193, 0.15); color: var(--brand); border: 1px solid rgba(22, 199, 193, 0.3); }

/* Layout: Doctor App */
.app-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: 100vh;
}

.sidebar {
  background-color: var(--bg-1);
  border-right: 1px solid var(--stroke);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 100;
}

.sidebar-header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--stroke);
}

.sidebar-nav {
  padding: var(--space-4) 0;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-5);
  color: var(--muted);
  font-weight: 500;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background-color: var(--card);
  color: var(--text);
}

.nav-item.active {
  color: var(--brand);
  border-left-color: var(--brand);
  background-color: rgba(22, 199, 193, 0.05);
}

.sidebar-footer {
  padding: var(--space-5);
  border-top: 1px solid var(--stroke);
}

.main-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 72px;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--stroke);
  background: rgba(11, 35, 54, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 90;
}

.content-area {
  padding: var(--space-6);
  flex: 1;
}

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.kpi-card .kpi-title {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: var(--space-2);
}

.kpi-card .kpi-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
}

/* Tables */
.table-wrapper {
  background: var(--bg-1);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  overflow: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table th {
  background-color: var(--bg-1);
  padding: var(--space-3) var(--space-4);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--stroke);
  position: sticky;
  top: 0;
  z-index: 10;
}

.table td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--stroke);
  font-size: 0.875rem;
  color: var(--text);
}

.table tbody tr {
  transition: background-color 0.2s;
}

.table tbody tr:hover {
  background-color: var(--card);
}

.table tbody tr.clickable {
  cursor: pointer;
}

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

/* Tabs */
.tabs-header {
  display: flex;
  gap: var(--space-4);
  border-bottom: 1px solid var(--stroke);
  margin-bottom: var(--space-5);
}

.tab-btn {
  background: none;
  border: none;
  color: var(--muted);
  padding: var(--space-3) 0;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

.tab-content {
  display: none;
}

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

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(7, 24, 39, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-1);
  border: 1px solid var(--stroke);
  border-radius: 12px;
  padding: var(--space-6);
  width: 100%;
  max-width: 500px;
  position: relative;
  transform: translateY(20px);
  transition: all 0.3s;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
}

.modal-close:hover {
  color: var(--text);
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: var(--space-7) var(--space-5);
  background: var(--card);
  border: 1px dashed var(--stroke);
  border-radius: 8px;
}

/* Navigation (Landing) */
.landing-nav {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--stroke);
  background: rgba(7, 24, 39, 0.9);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.landing-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 1px;
  color: var(--text);
}

/* Landing Specific */
.hero {
  padding: 100px 0;
  text-align: center;
}

.hero h1 {
  max-width: 800px;
  margin: 0 auto var(--space-4);
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto var(--space-6);
}

.steps-section {
  padding: 80px 0;
  background: var(--bg-1);
  border-top: 1px solid var(--stroke);
  border-bottom: 1px solid var(--stroke);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.step-card {
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--card);
  border: 1px solid var(--brand);
  color: var(--brand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 auto var(--space-4);
}

.benefits-section {
  padding: 80px 0;
}

.benefits-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

.benefits-list li {
  background: var(--card);
  padding: var(--space-5);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.benefits-list li::before {
  content: '✓';
  color: var(--brand);
  font-weight: bold;
}

.network-section {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 100%);
  border-top: 1px solid var(--stroke);
}

.footer {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--stroke);
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Auth Cards */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-5);
}

/* Charts Placeholder */
.chart-container {
  width: 100%;
  height: 200px;
  background: var(--bg-1);
  border: 1px solid var(--stroke);
  border-radius: 8px;
  display: flex;
  align-items: flex-end;
  padding: var(--space-4);
  gap: var(--space-2);
}

.chart-bar {
  flex: 1;
  background: var(--brand);
  border-radius: 4px 4px 0 0;
  opacity: 0.8;
  transition: opacity 0.2s;
}

.chart-bar:hover {
  opacity: 1;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .app-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    display: none;
  }
  .topbar {
    padding: 0 var(--space-4);
  }
  .content-area {
    padding: var(--space-4);
  }
  .h1 { font-size: 2rem; }
  .h2 { font-size: 1.5rem; }
}