:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --text: #111827;
  --muted: #6b7280;
  --border: #dbe3ee;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --success: #059669;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
  color: var(--text);
}

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

button,
input,
textarea {
  font: inherit;
}

button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--primary);
  color: white;
  cursor: pointer;
  text-decoration: none;
  transition: 0.15s ease;
}

button:hover,
.button-link:hover {
  background: var(--primary-dark);
}

.button-secondary,
.button-link-secondary {
  background: white;
  color: var(--text);
  border-color: var(--border);
}

.button-danger {
  background: #fff1f2;
  color: var(--danger);
  border-color: #fecdd3;
}

.button-secondary:hover,
.button-link-secondary:hover,
.button-danger:hover {
  background: #f8fafc;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.8rem 0.9rem;
  background: white;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

label {
  display: grid;
  gap: 0.45rem;
  font-weight: 600;
}

p {
  margin: 0;
}

.shell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.shell-center {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 0;
}

.card {
  background: var(--surface);
  border: 1px solid rgba(219, 227, 238, 0.9);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.auth-card,
.hero-card {
  width: min(100%, 560px);
  padding: 2rem;
}

.hero-card {
  text-align: left;
}

.badge {
  display: inline-flex;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: #dbeafe;
  color: #1d4ed8;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.hero-card h1,
.auth-card h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 3vw, 2.7rem);
  line-height: 1.1;
}

.hero-copy,
.auth-copy,
.muted {
  color: var(--muted);
}

.hero-actions,
.auth-actions,
.toolbar-actions,
.section-actions,
.report-actions,
.import-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.auth-form,
.stack {
  display: grid;
  gap: 1rem;
}

.auth-footer {
  margin-top: 1rem;
  color: var(--muted);
}

.status-box {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 12px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  white-space: pre-wrap;
  min-height: 54px;
}

.app-shell {
  padding: 1.25rem 0 2rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.topbar h1 {
  margin: 0;
  font-size: 1.1rem;
}

.topbar p {
  color: var(--muted);
}

.dashboard-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1.1fr 2fr;
}

.sidebar,
.content {
  display: grid;
  gap: 1.25rem;
}

.panel {
  padding: 1.25rem;
}

.panel h2,
.panel h3,
.client-card h3,
.client-card h4,
.client-card h5 {
  margin: 0 0 0.75rem;
}

.analytics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
}

.analytics-item {
  padding: 1rem;
  border-radius: 16px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
}

.analytics-item strong {
  display: block;
  font-size: 1.7rem;
  margin-top: 0.35rem;
}

.client-list {
  display: grid;
  gap: 1rem;
}

.client-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
}

.client-meta,
.list-empty {
  color: var(--muted);
}

.list-block {
  margin-top: 1rem;
}

.list-block ul {
  margin: 0;
  padding-left: 1.2rem;
}

.list-block li + li {
  margin-top: 0.8rem;
}

.report-section {
  margin-top: 0.9rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-alt);
}

.report-viewer {
  margin-top: 1rem;
}

.error-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 0;
}

.error-card {
  width: min(100%, 560px);
  padding: 2rem;
  text-align: center;
}

.error-code {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
  font-weight: 700;
}

@media (max-width: 900px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 1rem, 1180px);
  }

  .topbar,
  .panel,
  .client-card,
  .auth-card,
  .hero-card {
    padding: 1rem;
  }

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