/* Matheria visual foundation — shared by public, student, messages, and admin surfaces. */
:root {
  --m-font-sans: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --m-font-mono: "DM Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --m-font-display: "Fraunces", Georgia, serif;
  --m-accent: #b5ef69;
  --m-accent-strong: #9bdd50;
  --m-accent-ink: #14200f;
  --m-danger: #ff9f8e;
  --m-warning: #fff0b5;
  --m-info: #bfe6ff;
  --m-success: #dfffc6;
  --m-space-1: 4px;
  --m-space-2: 8px;
  --m-space-3: 12px;
  --m-space-4: 16px;
  --m-space-5: 20px;
  --m-space-6: 24px;
  --m-space-8: 32px;
  --m-space-10: 40px;
  --m-space-12: 48px;
  --m-radius-sm: 10px;
  --m-radius-md: 14px;
  --m-radius-lg: 20px;
  --m-radius-xl: 26px;
  --m-radius-pill: 999px;
  --m-control-sm: 36px;
  --m-control-md: 44px;
  --m-control-lg: 48px;
  --m-content-public: 1180px;
  --m-content-product: 1240px;
  --m-content-reading: 760px;
  --m-layer-header: 40;
  --m-layer-popover: 80;
  --m-layer-dialog: 120;
  --m-layer-toast: 160;
  --m-ease: cubic-bezier(.2, .8, .2, 1);
  --m-duration-fast: 140ms;
  --m-duration-base: 220ms;
  --m-focus: 0 0 0 3px color-mix(in srgb, var(--m-accent) 48%, transparent);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body,
button,
input,
select,
textarea { font-family: var(--m-font-sans); }

button,
a,
input,
select,
textarea { -webkit-tap-highlight-color: transparent; }

button:not(:disabled),
[role="button"]:not([aria-disabled="true"]) { cursor: pointer; }

button:disabled,
[aria-disabled="true"] { cursor: not-allowed; opacity: .58; }

:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 0;
  box-shadow: var(--m-focus);
}

::selection {
  background: color-mix(in srgb, var(--m-accent) 42%, transparent);
  color: inherit;
}

.m-icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  flex: 0 0 auto;
  line-height: 1;
  background: currentColor;
  -webkit-mask-image: var(--m-icon-source);
  mask-image: var(--m-icon-source);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
  vertical-align: middle;
}

.m-icon[data-icon-size="sm"] { font-size: 14px; }
.m-icon[data-icon-size="md"] { font-size: 18px; }
.m-icon[data-icon-size="lg"] { font-size: 22px; }

.m-icon-button {
  display: inline-grid;
  width: var(--m-control-md);
  height: var(--m-control-md);
  place-items: center;
  padding: 0;
  border-radius: var(--m-radius-md);
}

.m-icon-button .m-icon { font-size: 18px; }

/* Icons placed inside a dedicated surface must never inherit text-baseline offsets. */
.m-icon-surface {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  line-height: 1;
}

.m-icon-surface > .m-icon {
  display: block;
  margin: 0;
  transform: none;
  vertical-align: 0;
}

.m-control {
  min-height: var(--m-control-md);
  border-radius: var(--m-radius-md);
}

.m-kicker {
  font: 600 10px/1.35 var(--m-font-mono);
  letter-spacing: 1.25px;
  text-transform: uppercase;
}

.m-badge {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  gap: var(--m-space-2);
  padding: 0 var(--m-space-3);
  border-radius: var(--m-radius-pill);
  font: 500 10px/1 var(--m-font-mono);
  text-transform: uppercase;
}

.m-empty,
.m-loading,
.m-error {
  display: grid;
  min-height: 240px;
  place-content: center;
  justify-items: center;
  gap: var(--m-space-3);
  padding: var(--m-space-8);
  text-align: center;
}

.m-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: matheria-spin .8s linear infinite;
}

/* Shared public trust and support primitives. */
.legal-shell,
.legal-hero > * { min-width: 0; }

.legal-header {
  position: relative;
  z-index: var(--m-layer-header);
}

.legal-nav-cta,
.legal-button {
  min-height: var(--m-control-md);
  border-radius: var(--m-radius-md);
}

.legal-card,
.support-dialog { border-radius: var(--m-radius-xl); }

.legal-prose { max-width: 100%; }
.legal-prose > section,
.legal-prose .legal-actions,
.legal-prose .legal-callout { max-width: var(--m-content-reading); }

.legal-callout,
.legal-meta,
.contact-option { border-radius: var(--m-radius-lg); }

.legal-footer a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
}

.support-dialog { z-index: var(--m-layer-dialog); }
.support-close {
  width: var(--m-control-md);
  height: var(--m-control-md);
  border-radius: var(--m-radius-md);
  font-size: 18px;
}
.support-close .m-icon { font-size: 18px; }
.support-dialog input,
.support-dialog select,
.support-dialog textarea {
  display: block;
  width: 100%;
  min-width: 0;
  border-radius: var(--m-radius-md);
}
.support-dialog .support-form-grid { grid-template-columns: minmax(0, 1fr); }
.support-dialog .support-field { min-width: 0; }
.support-dialog .legal-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--m-space-2);
}
.support-toast {
  z-index: var(--m-layer-toast);
  border-radius: var(--m-radius-md);
}

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

@media (max-width: 560px) {
  :root {
    --m-space-8: 28px;
    --m-space-10: 32px;
    --m-space-12: 38px;
    --m-radius-xl: 22px;
  }

  .m-icon-button { width: 42px; height: 42px; }

  .legal-shell { width: calc(100% - 24px); }
  .legal-main { padding-top: 40px; }
  .legal-hero h1 {
    font-size: clamp(38px, 12.5vw, 52px);
    letter-spacing: -1.9px;
  }
  .legal-hero p:not(.legal-kicker) { font-size: 16px; }
  .legal-card,
  .support-dialog { border-radius: var(--m-radius-lg); }
  .legal-prose { padding: 24px 20px; }
  .legal-prose p,
  .legal-prose li { font-size: 15px; }
  .legal-actions { display: grid; }
  .legal-button { width: 100%; }
  .contact-option { padding: 22px 20px; }

  .support-dialog {
    width: calc(100% - 20px);
    max-height: calc(100dvh - 20px);
  }
  .support-dialog form { padding: 20px 18px; }
  .support-dialog-head { gap: 14px; }
  .support-dialog h2 { font-size: clamp(30px, 10vw, 38px); }
  .support-dialog-actions { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}