:root {
  color-scheme: light;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-muted: rgba(79, 70, 229, 0.12);
  --accent: #f97316;
  --accent-contrast: #0b1120;
  --text: #1f2933;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #52606d;
  --border: #e2e8f0;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --surface: #ffffff;
  --surface-muted: rgba(255, 255, 255, 0.85);
  --surface-elevated: rgba(255, 255, 255, 0.92);
  --shadow-soft: 0 20px 35px rgba(15, 23, 42, 0.08);
  --shadow-base: 0 14px 30px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 22px 45px rgba(15, 23, 42, 0.18);
  --radius: 18px;
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #eef2ff 0%, #f8fafc 45%, #fff7ed 100%);
  color: var(--text);
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

a:hover,
a:focus-visible {
  color: var(--primary-dark);
}

.container {
  width: min(1040px, 94vw);
  margin: 0 auto;
  padding: 0 1rem;
}

.topbar {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.25);
}

.nav-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
}

.brand {
  font-weight: 700;
  font-size: 1.4rem;
  color: #f8fafc;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-links a {
  color: #e2e8f0;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  background-color: rgba(255, 255, 255, 0.1);
  color: #f8fafc;
}

.nav-links .btn {
  color: #0f172a;
}

.nav-links .btn-nav,
.nav-links .btn-logout {
  color: #f8fafc;
}

.nav-links .btn-nav {
  margin-left: 0.35rem;
}

.nav-links .btn-logout {
  margin-left: 0.15rem;
}

.page-body {
  flex: 1;
  padding: 3rem 0 4rem;
}

.content-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.75rem, 2.5vw, 2.75rem);
  margin-top: 2rem;
  margin-bottom: 2rem;
  position: relative;
}

.content-card::before {
  content: "";
  position: absolute;
  inset: -1.5px;
  border-radius: calc(var(--radius) + 1.5px);
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.25), rgba(249, 115, 22, 0.25));
  z-index: -1;
  opacity: 0.6;
}

.content-card > *:first-child {
  margin-top: 0;
}

.page-footer {
  padding: 1.5rem 0 2.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.flash-messages {
  background: var(--primary-muted);
  border: 1px solid rgba(79, 70, 229, 0.25);
  border-radius: 14px;
  padding: 0.85rem 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--primary-dark);
  font-weight: 500;
}

.flash-messages p {
  margin: 0;
}

h1,
h2,
h3 {
  color: #0f172a;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.05rem, 2.6vw, 2.6rem);
  margin-bottom: 0.65rem;
}

.page-title {
  font-size: clamp(1.9rem, 2.3vw, 2.3rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.page-intro {
  margin-bottom: 2rem;
  color: var(--text-secondary);
  max-width: 60ch;
}

h2 {
  font-size: clamp(1.6rem, 2.1vw, 2rem);
  margin-bottom: 0.75rem;
}

p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

form {
  display: grid;
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.form-field {
  display: grid;
  gap: 0.45rem;
}

label {
  font-weight: 600;
  color: #1f2937;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="file"],
select,
textarea {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  font: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  background-color: #f8fafc;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  outline: none;
}

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.35rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  background-color: var(--primary);
  color: #fff;
  box-shadow: 0 12px 25px rgba(79, 70, 229, 0.25);
}

button:hover,
.btn:hover,
button:focus-visible,
.btn:focus-visible {
  background-color: var(--primary-dark);
  color: #fff;
}

button:disabled,
.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

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

.btn-nav {
  background: rgba(248, 250, 252, 0.16);
  color: #f8fafc;
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.25);
}

.btn-nav:hover,
.btn-nav:focus-visible {
  background: rgba(248, 250, 252, 0.28);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #e2e8f0;
  box-shadow: none;
  border: 1px solid rgba(226, 232, 240, 0.28);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: rgba(226, 232, 240, 0.15);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.08);
  color: var(--text);
  box-shadow: none;
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(15, 23, 42, 0.14);
}

.btn-logout {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
  box-shadow: 0 12px 26px rgba(239, 68, 68, 0.25);
}

.btn-logout:hover,
.btn-logout:focus-visible {
  background: #b91c1c;
  color: #fff;
}

.btn-text {
  background: transparent;
  color: var(--primary);
  box-shadow: none;
  padding: 0.6rem 0.8rem;
}

.btn-text:hover,
.btn-text:focus-visible {
  background: rgba(79, 70, 229, 0.12);
}

.btn-icon {
  padding: 0.45rem 0.75rem;
  border-radius: 12px;
  font-size: 0.9rem;
  box-shadow: none;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.page-section {
  display: grid;
  gap: 1.25rem;
}

.page-section.narrow {
  max-width: 540px;
  margin: 0 auto;
}

.section-header p {
  margin-bottom: 0;
}

.table-wrapper {
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

thead {
  background: linear-gradient(120deg, rgba(79, 70, 229, 0.16), rgba(249, 115, 22, 0.08));
}

th,
td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

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

tbody tr:hover {
  background: rgba(79, 70, 229, 0.05);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: rgba(15, 23, 42, 0.08);
  color: #0f172a;
}

.badge.success {
  background: rgba(34, 197, 94, 0.15);
  color: #15803d;
}

.badge.warning {
  background: rgba(249, 115, 22, 0.18);
  color: #c2410c;
}

.badge.info {
  background: rgba(14, 165, 233, 0.15);
  color: #0369a1;
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  border: 1px dashed rgba(79, 70, 229, 0.3);
  border-radius: 16px;
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 720px) {
  .nav-layout {
    flex-direction: column;
    gap: 0.9rem;
    align-items: flex-start;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .content-card {
    padding: 1.75rem;
  }

  table {
    min-width: unset;
  }
}