:root {
  color-scheme: light dark;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #0f172a;
  --color-surface: #ffffff;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-background: #f8fafc;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;
  --color-text: #0f172a;
  --shadow-sm: 0px 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0px 8px 30px rgba(15, 23, 42, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--color-background);
  color: var(--color-text);
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

main {
  flex: 1;
}

.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-content {
  flex: 1;
  padding: 2.5rem 1rem;
}

@media (min-width: 768px) {
  .app-content {
    padding: 3rem 0;
  }
}

.page-container {
  width: min(960px, 92vw);
  margin: 0 auto;
}

.section-heading {
  margin: 0 0 1.5rem;
  font-size: clamp(1.5rem, 2vw + 1rem, 2.25rem);
  font-weight: 700;
  color: var(--color-secondary);
}

.section-subheading {
  margin: -0.75rem 0 2.5rem;
  font-size: 1rem;
  color: var(--color-muted);
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.16);
  box-shadow: var(--shadow-sm);
  padding: clamp(1.25rem, 2vw, 2rem);
}

.card + .card {
  margin-top: 1.5rem;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

@media (min-width: 1024px) {
  .grid--two-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 2px;
}

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

.button--primary {
  background: linear-gradient(135deg, var(--color-primary), #3b82f6);
  color: white;
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
}

.button--primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-hover), #2563eb);
  transform: translateY(-1px);
}

.button--ghost {
  background: transparent;
  border-color: rgba(148, 163, 184, 0.3);
  color: var(--color-secondary);
}

.button--ghost:hover:not(:disabled) {
  background: rgba(148, 163, 184, 0.12);
}

.button.is-active {
  background: rgba(37, 99, 235, 0.18);
  color: var(--color-primary);
  border-color: rgba(37, 99, 235, 0.45);
}

.button--danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
}

.form {
  display: grid;
  gap: 1rem;
}

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

.form-label {
  font-weight: 600;
  color: var(--color-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(255, 255, 255, 0.92);
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
  outline: none;
}

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

.form-helper {
  color: var(--color-muted);
  font-size: 0.875rem;
}

.alert {
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.95rem;
}

.alert--error {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #b91c1c;
}

.alert--success {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #15803d;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.015em;
}

.status-badge--success {
  background: rgba(22, 163, 74, 0.16);
  color: #15803d;
}

.status-badge--warning {
  background: rgba(245, 158, 11, 0.16);
  color: #b45309;
}

.status-badge--muted {
  background: rgba(148, 163, 184, 0.2);
  color: var(--color-muted);
}

.navbar {
  backdrop-filter: blur(12px);
  background: rgba(15, 23, 42, 0.92);
  color: white;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.9rem 1.5rem;
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 auto;
  width: min(1100px, 95vw);
}

.navbar__brand {
  margin: 0;
  font-size: clamp(1.25rem, 1.5vw + 1rem, 1.6rem);
  letter-spacing: -0.02em;
}

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

.navbar__user {
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

@media (max-width: 640px) {
  .navbar__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .navbar__actions {
    width: 100%;
    justify-content: space-between;
  }
}

.auth-layout {
  min-height: calc(100vh - 120px);
  display: grid;
  align-items: center;
  justify-items: center;
  padding: clamp(2rem, 5vw, 4rem) 1.5rem;
  background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.12), transparent 55%),
    radial-gradient(circle at bottom left, rgba(14, 165, 233, 0.18), transparent 45%);
}

.auth-card {
  width: min(440px, 100%);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 2.5vw, 2.5rem);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.auth-card__header {
  display: grid;
  gap: 0.65rem;
  text-align: center;
  margin-bottom: 1.75rem;
}

.auth-card__title {
  margin: 0;
  font-size: clamp(1.75rem, 2vw + 1rem, 2.15rem);
  font-weight: 700;
}

.auth-card__subtitle {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.auth-footer {
  margin-top: 1.75rem;
  text-align: center;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.task-grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

@media (min-width: 768px) {
  .task-grid {
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  }
}

.task-card {
  position: relative;
  padding-bottom: 1.25rem;
}

.task-card__title {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.task-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1.5rem;
  border-radius: var(--radius-lg);
  background: rgba(248, 250, 252, 0.85);
  border: 1px dashed rgba(148, 163, 184, 0.45);
  color: var(--color-muted);
}

.spinner {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 4px solid rgba(37, 99, 235, 0.18);
  border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

.spinner--sm {
  width: 1.5rem;
  height: 1.5rem;
  border-width: 3px;
}

.loading-state {
  display: grid;
  justify-items: center;
  gap: 0.75rem;
  padding: 2.5rem 0;
  color: var(--color-muted);
}

.table-list {
  display: grid;
  gap: 1.25rem;
}

.submission-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.85rem;
}

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