/* ========================================
   iLink Layout v7 — Campus Blueprint
   Global page shell, rhythm, atmosphere
   Depends: design-tokens.css, effects.css, components.css
   ======================================== */

/* --- App shell --- */
html.ilink-app,
.ilink-app {
  scroll-behavior: smooth;
}

.ilink-app body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.ilink-app body.ilink-page-bg {
  background-color: var(--bg-body);
  background-image:
    var(--bg-mesh),
    var(--bg-grid);
  background-size: 100% 480px, 48px 48px;
  background-position: top center, 0 0;
  background-attachment: fixed, fixed;
}

.ilink-app ::selection {
  background: var(--primary-light);
  color: var(--primary);
}

/* --- Page containers --- */
.ilink-app .il-page-wrapper {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-12);
  position: relative;
  z-index: 1;
}

.ilink-app .il-page-wrapper--narrow {
  max-width: var(--container-narrow);
}

/* --- Unified page hero --- */
.ilink-app .il-hero {
  margin-bottom: 48px;
}

.ilink-app .il-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 16px;
  margin-bottom: var(--space-4);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  background: var(--bg-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
}

.ilink-app .il-hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.03em;
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}

.ilink-app .il-hero-desc {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 42rem;
  margin: 0;
}

/* --- Section rhythm --- */
.ilink-app .il-section {
  margin-bottom: var(--space-10);
}

.ilink-app .il-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-light);
}

.ilink-app .il-section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--text-primary);
}

.ilink-app .il-section-sub {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin: var(--space-1) 0 0;
}

/* --- Cards & surfaces (page-level) --- */
.ilink-app .il-surface {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--transition-slow) cubic-bezier(0.32, 0.72, 0, 1),
    transform var(--transition-slow) cubic-bezier(0.32, 0.72, 0, 1),
    border-color var(--transition-fast);
}

.ilink-app .il-surface:hover {
  border-color: var(--border-default);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.ilink-app .il-surface--lift:hover {
  transform: translateY(-2px);
}

/* --- Empty & loading states --- */
.ilink-app .il-empty {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--text-secondary);
}

.ilink-app .il-empty__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.5rem;
}

.ilink-app .il-empty__title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--space-2);
}

.ilink-app .il-empty__desc {
  font-size: var(--font-size-sm);
  margin: 0 auto var(--space-5);
  max-width: 24rem;
}

/* --- Form polish (Bootstrap + native) --- */
.ilink-app input:not([type="checkbox"]):not([type="radio"]):not([type="submit"]):not([type="button"]):not([type="range"]),
.ilink-app textarea,
.ilink-app select,
.ilink-app .form-control {
  border-radius: var(--radius-md) !important;
  border-color: var(--border-default) !important;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast) !important;
  min-height: 42px !important;
}

.ilink-app input:focus,
.ilink-app textarea:focus,
.ilink-app select:focus,
.ilink-app .form-control:focus {
  border-color: var(--primary) !important;
  box-shadow: 0 0 0 3px var(--brand-ring) !important;
  outline: none !important;
}

/* --- Tables --- */
.ilink-app .table {
  --bs-table-bg: transparent;
}

.ilink-app .table thead th {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  border-bottom-width: 1px;
}

/* --- Unified page transition ---
   Keep navigation native and never hide an already painted document.  The
   previous cross-document transition could be aborted by the browser, while
   adding a class after DOMContentLoaded replayed opacity from zero and caused
   a visible flash.  A tiny paint-time entrance gives continuity without
   delaying links, history navigation, downloads or forms. */
@keyframes ilink-page-in {
  from {
    opacity: 0.985;
    transform: translate3d(0, 2px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .ilink-app body > main,
  .ilink-app body > .il-page-wrapper,
  .ilink-app body > .main-content {
    animation: ilink-page-in 160ms cubic-bezier(0.22, 1, 0.36, 1) both;
  }
}

/* --- Error page (404) --- */
.ilink-app .il-error-page {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-10) var(--space-6);
}

.ilink-app .il-error-brand {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  background: var(--primary);
  color: var(--text-white);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  font-size: 15px;
  letter-spacing: -0.04em;
  box-shadow: var(--shadow-sm);
}

.ilink-app .il-error-card {
  width: 100%;
  max-width: 440px;
  text-align: center;
  padding: var(--space-10) var(--space-8);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.ilink-app .il-error-code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 6rem);
  font-weight: var(--font-weight-bold);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--primary);
  margin: 0 0 var(--space-2);
}

.ilink-app .il-error-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-2);
  color: var(--text-primary);
}

.ilink-app .il-error-desc {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin: 0 0 var(--space-6);
  line-height: var(--line-height-relaxed);
}

@media (max-width: 768px) {
  .ilink-app .il-page-wrapper {
    padding: var(--space-6) var(--space-4) var(--space-16);
  }

  .ilink-app .il-section-head {
    flex-direction: column;
    align-items: flex-start;
  }
}