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

:root {
  --bg-canvas:     #0d0f11;
  --bg-surface:    #16181c;
  --bg-elevated:   #1e2026;
  --bg-overlay:    #24262d;
  --border:        #31343d;
  --border-subtle: #252830;
  --text-primary:  #e3e4e6;
  --text-secondary:#8b8e96;
  --text-muted:    #52555c;
  --accent:        #8b9dc3;
  --accent-hover:  #a8b9e0;
  --accent-bg:     rgba(139, 157, 195, 0.12);
  --accent-glow:   rgba(139, 157, 195, 0.25);
  --danger:        #b87c7c;
  --radius:        12px;
  --radius-sm:     8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Navigation ─── */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 15, 17, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.btn-signin {
  padding: 8px 20px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-signin:hover {
  background: var(--accent);
  color: var(--bg-canvas);
}

/* ─── Hero ─── */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 24px 80px;
  position: relative;
  overflow: hidden;
}

#bgCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  max-width: 720px;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  background: var(--accent);
  color: var(--bg-canvas);
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-hero:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}



/* ─── Sections ─── */

.section {
  padding: 100px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 48px;
}

/* ─── Features ─── */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-bg);
  border-radius: 12px;
  margin-bottom: 20px;
  font-size: 24px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ─── About ─── */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.7;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.stat-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
}

.stat-number {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── Footer ─── */

footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 24px;
  text-align: center;
}

footer p {
  color: var(--text-muted);
  font-size: 13px;
}

/* ─── Login Modal ─── */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

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

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: 100%;
  max-width: 420px;
  padding: 40px 36px 36px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.3s;
}

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

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.2s;
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.modal-header {
  margin-bottom: 28px;
}

.modal-header h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-header p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 6px;
}

/* ─── Auth Steps ─── */

.auth-step.hidden {
  display: none;
}

.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.input-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  transition: border-color 0.2s;
  outline: none;
}

.input-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input::placeholder {
  color: var(--text-muted);
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--bg-canvas);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-back {
  width: 100%;
  padding: 10px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  margin-top: 8px;
  transition: color 0.2s;
}

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

.auth-error {
  font-size: 13px;
  color: var(--danger);
  margin-top: 10px;
  min-height: 0;
  opacity: 0;
  transition: opacity 0.3s;
}

.auth-error.visible {
  opacity: 1;
}

/* ─── User Info in Modal ─── */

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--accent-bg);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-radius: 50%;
  font-size: 16px;
  font-weight: 700;
  color: var(--bg-canvas);
  flex-shrink: 0;
}

.user-details {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.user-email {
  font-size: 13px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-tenant {
  font-size: 12px;
  color: var(--accent-primary, #8b9dc3);
  font-weight: 500;
  margin-top: 2px;
}

.user-role-badge {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--accent-bg);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ─── Spinner ─── */

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(139, 157, 195, 0.3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ─── Responsive ─── */

@media (max-width: 768px) {
  .nav-links a { display: none; }
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .hero { padding: 80px 20px 60px; }
  .modal { margin: 0 16px; padding: 32px 24px; }
}