:root {
  --clr-bg: #f6f8fc;
  --clr-surface: #ffffff;
  --clr-surface-alt: #f8fafc;
  --clr-border: #e5e7eb;
  --clr-text: #1f2937;
  --clr-muted: #6b7280;
  --clr-primary: #1a73e8;
  --clr-primary-hover: #1558b0;
  --clr-success: #1e8e3e;
  --clr-danger: #d93025;
  --clr-warning: #b45309;
  --clr-light: #ffffff;
  --clr-accent: #1a73e8;
  --font-family: 'Roboto', 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-family);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

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

.page-section {
  width: 100%;
  padding: 2.5rem 1rem 3rem;
}

.page-panel {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
}

.section-title {
  font-size: clamp(1.75rem, 2.3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--clr-text);
  margin: 0 0 1rem;
}

.section-subtitle {
  color: var(--clr-muted);
  font-size: 1rem;
  line-height: 1.7;
}

.muted-text {
  color: var(--clr-muted);
}

.surface-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
}

.btn-primary,
.btn.btn-primary {
  background-color: var(--clr-primary);
  border-color: var(--clr-primary);
}

.btn-primary:hover,
.btn.btn-primary:hover,
.btn-primary:focus,
.btn.btn-primary:focus {
  background-color: var(--clr-primary-hover);
  border-color: var(--clr-primary-hover);
}

.btn-outline-info {
  color: var(--clr-primary);
  border-color: rgba(26, 115, 232, 0.25);
}

.btn-outline-info:hover {
  background-color: rgba(26, 115, 232, 0.08);
  color: var(--clr-primary-hover);
}

.alert {
  border-radius: 14px;
}

.form-control,
input,
select,
textarea {
  border-radius: 12px;
  border: 1px solid var(--clr-border);
}

.form-control:focus,
input:focus,
select:focus,
textarea:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 0.2rem rgba(26, 115, 232, 0.15);
}

.text-accent {
  color: var(--clr-primary) !important;
}

.page-back-nav {
  margin-bottom: 1rem;
}

.page-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.85rem 0.5rem 0.55rem;
  border: 1px solid var(--clr-border);
  border-radius: 999px;
  background: var(--clr-surface);
  color: var(--clr-text);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), color var(--transition), background-color var(--transition);
}

.page-back-link i {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--clr-primary);
  background: rgba(26, 115, 232, 0.1);
}

.page-back-link:hover,
.page-back-link:focus {
  color: var(--clr-primary-hover);
  background: #ffffff;
  border-color: rgba(26, 115, 232, 0.26);
  box-shadow: 0 8px 20px rgba(26, 115, 232, 0.1);
  transform: translateY(-1px);
  text-decoration: none;
}

@media (max-width: 768px) {
  .page-section {
    padding: 1.5rem 0.75rem 2.5rem;
  }
}