:root {
  --color-bg: #ffffff;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-border-soft: #f0f1f3;
  --color-accent: #16a34a;
  --color-accent-soft: #ecfdf3;
  --color-black: #111111;
  --color-black-hover: #262626;
  --color-danger: #dc2626;
  --radius: 10px;
  --radius-sm: 8px;
  --shadow-card: 0 1px 2px rgba(16, 24, 40, 0.04);
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--color-black);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-black-hover);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover {
  background: #128a3e;
}

.btn-outline {
  background: #fff;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover {
  border-color: #c7cbd1;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

/* ---------- Top nav ---------- */

.topnav {
  border-bottom: 1px solid var(--color-border);
  background: #fff;
}

.topnav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 4px;
  overflow-x: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-item svg {
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item:hover {
  background: #fafafa;
}

.nav-item.active {
  border-color: var(--color-accent);
  color: var(--color-text);
  font-weight: 600;
}

.nav-item.active svg {
  opacity: 1;
}

/* ---------- Page shell ---------- */

.page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 28px 60px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-subtitle {
  color: var(--color-muted);
  font-size: 14px;
  margin: 0;
  max-width: 640px;
  line-height: 1.5;
}

/* ---------- Cards ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

@media (max-width: 900px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-card {
  padding: 20px;
}

.stat-label {
  font-size: 13px;
  color: var(--color-muted);
  font-weight: 500;
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.stat-trend {
  font-size: 12.5px;
  color: var(--color-accent);
  margin-top: 6px;
}

.panel {
  padding: 24px;
}

.panel-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-subtitle {
  color: var(--color-muted);
  font-size: 13px;
  margin: 0 0 20px;
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-muted);
  font-size: 14px;
}

/* ---------- Login page ---------- */

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fafafa;
  padding: 20px;
}

.login-card {
  width: 100%;
  max-width: 380px;
  padding: 36px 32px 32px;
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}

.login-brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.login-brand-name {
  font-size: 17px;
  font-weight: 700;
}

.login-title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 4px;
}

.login-subtitle {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0 0 24px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--color-text);
  background: #fff;
}

.field input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.form-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--color-danger);
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
}

.login-footnote {
  text-align: center;
  font-size: 12.5px;
  color: var(--color-muted);
  margin-top: 20px;
}

/* ---------- Global overlay modal (replaces browser confirm()/alert()) ---------- */

.app-modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(17, 17, 17, 0.45);
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.app-modal-overlay.open {
  display: flex;
}
.app-modal-box {
  background: #fff;
  border-radius: var(--radius);
  width: 100%;
  max-width: 420px;
  padding: 24px;
  box-shadow: 0 10px 40px rgba(16, 24, 40, 0.18);
}
.app-modal-box h2 {
  margin: 0 0 8px;
  font-size: 17px;
}
.app-modal-box p {
  margin: 0 0 20px;
  font-size: 13.5px;
  color: var(--color-muted);
  line-height: 1.5;
  white-space: pre-line;
}
.app-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.mode-badge {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f3f4f6;
  color: #374151;
  margin-left: 6px;
}