* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  background: linear-gradient(180deg, #f4f7fb 0%, #eef2f6 100%);
  color: #17324d;
}

a {
  color: #1057c2;
  text-decoration: none;
}

.page-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.sidebar {
  padding: 28px 20px;
  background: linear-gradient(180deg, #14375a 0%, #0f2a45 100%);
  color: #ffffff;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
}

.nav-link {
  display: block;
  padding: 12px 14px;
  margin-bottom: 8px;
  border-radius: 12px;
  color: rgba(255, 255, 255, 0.85);
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
}

.nav-form {
  margin: 0;
}

.nav-button {
  width: 100%;
  border: 0;
  text-align: left;
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.content {
  padding: 28px;
}

.page-title {
  margin: 0 0 8px;
  font-size: 30px;
}

.page-subtitle {
  margin: 0 0 24px;
  color: #65758a;
}

.flash {
  margin-bottom: 18px;
  padding: 12px 16px;
  border-radius: 12px;
  background: #dcfbe8;
  color: #11623e;
}

.flash.error {
  background: #fee2e2;
  color: #991b1b;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.card,
.form-card,
.table-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(20, 55, 90, 0.08);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 12px 40px rgba(16, 42, 69, 0.08);
}

.metric-value {
  font-size: 32px;
  font-weight: 700;
  margin: 8px 0 4px;
}

.muted {
  color: #6f7f90;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 20px;
}

.form-card h2,
.table-card h2 {
  margin-top: 0;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  color: #44617f;
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #d7dfeb;
  font-size: 14px;
  background: #ffffff;
}

.field textarea {
  min-height: 110px;
  resize: vertical;
}

.hint {
  margin-top: 6px;
  font-size: 12px;
  color: #72859b;
}

.button-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.button {
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  background: linear-gradient(135deg, #1065d7 0%, #0e86d2 100%);
  color: #ffffff;
  font-weight: 600;
  cursor: pointer;
}

.button.secondary {
  background: #e8eef7;
  color: #234768;
}

.tab-row {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.tab {
  padding: 10px 14px;
  border-radius: 999px;
  background: #dce7f5;
  color: #28507d;
}

.tab.active {
  background: linear-gradient(135deg, #ffb347 0%, #ff7a59 100%);
  color: #ffffff;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid #edf1f6;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

th {
  color: #58718d;
  font-weight: 600;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: #e7f1ff;
  color: #1e5ab0;
  font-size: 12px;
}

video {
  width: 100%;
  border-radius: 14px;
  margin-top: 12px;
  background: #000000;
}

.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: min(460px, 100%);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(20, 55, 90, 0.12);
  border-radius: 20px;
  box-shadow: 0 18px 48px rgba(16, 42, 69, 0.12);
  padding: 24px;
}

@media (max-width: 980px) {
  .page-shell {
    grid-template-columns: 1fr;
  }

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

  .content {
    padding: 20px;
  }
}