:root {
  color-scheme: light;
  --navy: #062f63;
  --navy-2: #0b4fa5;
  --blue: #0a56c9;
  --blue-soft: #eaf3ff;
  --page: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #f8fbff;
  --text: #10233f;
  --muted: #56657a;
  --border: #cddcf0;
  --input-border: #9fb5d1;
  --shadow: 0 8px 24px rgba(19, 52, 89, 0.09);
  --good: #188038;
  --good-soft: #e8f5e9;
  --caution: #b76a00;
  --caution-soft: #fff4d6;
  --critical: #c5221f;
  --critical-soft: #fde8e7;
  --neutral: #60758e;
  --neutral-soft: #edf2f7;
  --focus: #4f8ef7;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --page: #081522;
  --surface: #102235;
  --surface-2: #142a40;
  --text: #edf5ff;
  --muted: #b8c7d9;
  --border: #31506f;
  --input-border: #56738f;
  --shadow: none;
  --blue-soft: #132f50;
  --good-soft: #123a25;
  --caution-soft: #3b2b08;
  --critical-soft: #401b1d;
  --neutral-soft: #1b3044;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-width: 320px;
  background: var(--page);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.45;
}

button, input, select { font: inherit; }

.app-header {
  background: linear-gradient(135deg, #052b5d 0%, #073c7d 100%);
  color: white;
  padding: max(18px, env(safe-area-inset-top)) clamp(18px, 4vw, 44px) 24px;
  text-align: left;
}

.brand-wrap {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  width: 100%;
}

.brand-logo {
  display: block;
  width: clamp(290px, 48vw, 560px);
  max-width: calc(100% - 120px);
  height: auto;
  object-fit: contain;
  flex: 0 1 auto;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(4, 10px);
  grid-template-rows: repeat(3, 10px);
  gap: 3px;
  flex: 0 0 auto;
}
.brand-mark span { clip-path: polygon(0 0, 100% 0, 100% 100%); }
.brand-mark span:nth-child(4n+1) { background:#73c044; }
.brand-mark span:nth-child(4n+2) { background:#61c5d7; }
.brand-mark span:nth-child(4n+3) { background:#8c6bb1; }
.brand-mark span:nth-child(4n+4) { background:#f59b32; }

.brand-text { flex: 1; }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; flex: 0 0 auto; }
.home-button {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid rgba(255,255,255,.5);
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  color: white;
  text-decoration: none;
  transition: background-color .18s ease, transform .18s ease, border-color .18s ease;
}
.home-button svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.home-button:hover { background: rgba(255,255,255,.2); border-color: rgba(255,255,255,.8); transform: scale(1.05); }
.home-button:focus-visible { outline: 3px solid rgba(255,216,77,.95); outline-offset: 3px; }
.brand-main { font-size: clamp(1.55rem, 4vw, 2.35rem); font-weight: 750; line-height: 1; }
.brand-sub { margin-top: 5px; font-size: clamp(1rem, 2.4vw, 1.45rem); line-height: 1.15; }

.icon-button {
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255,255,255,.5);
  border-radius: 12px;
  background: rgba(255,255,255,.1);
  color: white;
  cursor: pointer;
}
.icon-button:hover { background: rgba(255,255,255,.18); }
.theme-icon { font-size: 1.5rem; }

.title-rule {
  max-width: 1120px;
  margin: 18px auto;
  height: 1px;
  background: rgba(255,255,255,.35);
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.55rem, 4vw, 2.6rem);
  line-height: 1.15;
  text-transform: uppercase;
  letter-spacing: .02em;
}

.patient-type {
  margin: 8px 0 0;
  color: #ffd84d;
  font-size: clamp(1rem, 2.6vw, 1.45rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.subtitle {
  margin: 5px 0 0;
  font-size: clamp(.95rem, 2.3vw, 1.18rem);
}

.app-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 24px auto 32px;
}

.panel, .results-panel, .range-guide, .disclaimer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.panel { padding: clamp(18px, 3vw, 30px); margin-bottom: 20px; }

.section-heading, .results-heading-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.section-heading h2, .results-heading-row h2, .range-guide h2 {
  margin: 0;
  color: var(--navy-2);
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: .015em;
}
html[data-theme="dark"] .section-heading h2,
html[data-theme="dark"] .results-heading-row h2,
html[data-theme="dark"] .range-guide h2 { color: #7fb4ff; }

.step-number {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: white;
  font-weight: 800;
  font-size: 1.15rem;
}

.two-column, .three-column {
  display: grid;
  gap: 18px;
}
.two-column { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.three-column { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.field { display: block; min-width: 0; }
.field-label { display: block; margin-bottom: 8px; font-weight: 700; font-size: 1rem; }

select, input {
  width: 100%;
  min-height: 58px;
  border: 2px solid var(--input-border);
  border-radius: 12px;
  background: var(--surface-2);
  color: var(--text);
  padding: 12px 14px;
  font-size: 1.18rem;
  outline: none;
}
select:focus, input:focus { border-color: var(--focus); box-shadow: 0 0 0 4px rgba(79,142,247,.18); }

.input-with-unit {
  display: flex;
  align-items: stretch;
  border: 2px solid var(--input-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-2);
}
.input-with-unit:focus-within { border-color: var(--focus); box-shadow: 0 0 0 4px rgba(79,142,247,.18); }
.input-with-unit input {
  min-width: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none !important;
}
.unit {
  display: flex;
  align-items: center;
  padding: 0 14px;
  color: var(--muted);
  font-weight: 650;
  white-space: nowrap;
  background: rgba(114,143,176,.08);
}

.field-hint, .field-error { display: block; margin-top: 6px; min-height: 1.1em; font-size: .82rem; }
.field-hint { color: var(--muted); }
.field-error { color: var(--critical); font-weight: 650; }
.is-invalid { border-color: var(--critical) !important; }

.action-row { display: flex; justify-content: center; margin-top: 24px; }

.reset-button {
  width: min(100%, 420px);
  min-height: 54px;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(135deg, #0b58ca, #063b8d);
  color: white;
  padding: 12px 20px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .02em;
  cursor: pointer;
}
.reset-button:hover { filter: brightness(1.08); }
.reset-button:active { transform: translateY(1px); }

.results-panel { padding: clamp(18px, 3vw, 30px); margin-bottom: 20px; }
.results-heading-row { justify-content: space-between; }
.status-chip {
  border-radius: 999px;
  padding: 7px 11px;
  background: var(--neutral-soft);
  color: var(--neutral);
  font-size: .85rem;
  font-weight: 750;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.result-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-2);
  padding: 22px;
  text-align: center;
}
.result-label {
  min-height: 2.7em;
  color: var(--navy-2);
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: .01em;
}
html[data-theme="dark"] .result-label { color: #8ebeff; }

.result-value {
  margin: 14px 0 12px;
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 850;
  line-height: 1;
  color: var(--navy);
}
html[data-theme="dark"] .result-value { color: #e7f1ff; }
.result-value small { font-size: .4em; white-space: nowrap; }
.result-detail { color: var(--muted); font-size: .94rem; }

.duration-card { transition: background-color .2s, border-color .2s; }
.duration-value { margin-top: 8px; font-size: clamp(2.25rem, 5vw, 3.4rem); line-height: 1; font-weight: 900; white-space: nowrap; }
.duration-unit { margin-top: 8px; font-weight: 800; text-transform: uppercase; }
.range-badge { margin-top: 16px; border-radius: 12px; padding: 11px; font-weight: 850; text-transform: uppercase; }

.duration-card.good { border-color: var(--good); background: var(--good-soft); color: var(--good); }
.duration-card.caution { border-color: #e4a20a; background: var(--caution-soft); color: var(--caution); }
.duration-card.critical { border-color: var(--critical); background: var(--critical-soft); color: var(--critical); }
.duration-card.neutral { color: var(--neutral); }

.recommendation {
  margin-top: 18px;
  display: flex;
  align-items: flex-start;
  gap: 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}
.recommendation.good { background: var(--good-soft); border-color: var(--good); color: var(--good); }
.recommendation.caution { background: var(--caution-soft); border-color: #e4a20a; color: var(--caution); }
.recommendation.critical { background: var(--critical-soft); border-color: var(--critical); color: var(--critical); }
.recommendation.neutral { background: var(--neutral-soft); color: var(--neutral); }
.recommendation-icon {
  width: 28px; height: 28px; flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; border: 2px solid currentColor; font-weight: 900;
  line-height: 1; padding: 0;
}
.recommendation-icon svg {
  width: 18px; height: 18px; display: block;
  fill: none; stroke: currentColor; stroke-width: 3;
  stroke-linecap: round; stroke-linejoin: round;
}
.recommendation-title { font-weight: 850; }
.recommendation-text { margin-top: 3px; color: var(--text); }

.range-guide { padding: 20px 24px; margin-bottom: 20px; }
.range-guide h2 { font-size: 1rem; margin-bottom: 14px; }
.range-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.range-item { display: flex; align-items: center; gap: 11px; padding: 8px; }
.range-item + .range-item { border-left: 1px solid var(--border); }
.range-symbol {
  width: 38px; height: 38px; flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center; border-radius: 50%;
  color: white; font-size: 1.25rem; font-weight: 900;
  line-height: 1; padding: 0;
}
.range-symbol svg {
  width: 24px; height: 24px; display: block;
  fill: none; stroke: currentColor; stroke-width: 3;
  stroke-linecap: round; stroke-linejoin: round;
}
.range-item.good .range-symbol { background: var(--good); }
.range-item.caution .range-symbol { background: #e49b00; }
.range-item.critical .range-symbol { background: var(--critical); }
.range-item strong, .range-item span { display: block; }
.range-item.good strong { color: var(--good); }
.range-item.caution strong { color: var(--caution); }
.range-item.critical strong { color: var(--critical); }

.disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  padding: 18px 22px;
  color: var(--navy-2);
  background: var(--blue-soft);
}
html[data-theme="dark"] .disclaimer { color: #bcd9ff; }
.disclaimer p { margin: 0; }
.info-symbol {
  width: 28px; height: 28px; flex: 0 0 auto;
  display: grid; place-items: center; border-radius: 50%;
  color: white; background: var(--blue); font-weight: 900;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 4px 0;
  color: var(--muted);
  font-size: .86rem;
}

.noscript { margin: 20px; padding: 16px; background: var(--critical-soft); color: var(--critical); }

@media (max-width: 820px) {
  .three-column { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .result-label { min-height: 0; }
}

@media (max-width: 660px) {
  .app-shell { width: min(100% - 18px, 1180px); margin-top: 12px; }
  .two-column { grid-template-columns: 1fr; }
  .range-grid { grid-template-columns: 1fr; }
  .range-item + .range-item { border-left: 0; border-top: 1px solid var(--border); }
  .brand-mark { grid-template-columns: repeat(4, 8px); grid-template-rows: repeat(3, 8px); }
  .icon-button, .home-button { width: 42px; height: 42px; }
  footer { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

/* BiPAP test calculator additions */
.tank-selector {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.tank-option {
  min-height: 88px;
  border: 2px solid var(--input-border);
  border-radius: 14px;
  background: var(--surface-2);
  color: var(--text);
  padding: 15px 12px;
  cursor: pointer;
  text-align: center;
  transition: border-color .18s, background-color .18s, transform .18s, box-shadow .18s;
}
.tank-option strong, .tank-option span { display: block; }
.tank-option strong { color: var(--navy-2); font-size: 1.18rem; }
.tank-option span { margin-top: 5px; color: var(--muted); font-size: .9rem; }
.tank-option:hover { transform: translateY(-1px); border-color: var(--focus); }
.tank-option.selected {
  border-color: var(--blue);
  background: var(--blue-soft);
  box-shadow: 0 0 0 3px rgba(79,142,247,.15);
}
.tank-option.selected strong { color: var(--blue); }
html[data-theme="dark"] .tank-option strong { color: #8ebeff; }
.pressure-field { margin-top: 20px; max-width: 560px; }
.height-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.assumptions-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
  padding: 15px 16px;
}
.assumptions-card ul { margin: 8px 0 0 1.1rem; padding: 0; color: var(--muted); }
.assumptions-card li + li { margin-top: 5px; }
.range-duration-card { min-width: 0; }
.range-duration-card .duration-value { white-space: normal; font-size: clamp(2rem, 4.5vw, 3.2rem); }
.bipap-results { align-items: stretch; }
@media (max-width: 760px) {
  .tank-selector { grid-template-columns: 1fr; }
  .tank-option { min-height: 72px; }
}

/* Version 0.2 refinements */
.title-with-icon {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 3vw, 26px);
}

.title-with-icon > div { min-width: 0; }

.bipap-image {
  width: clamp(92px, 13vw, 150px);
  height: clamp(78px, 11vw, 126px);
  flex: 0 0 auto;
  object-fit: contain;
  filter: drop-shadow(0 5px 8px rgba(0,0,0,.28));
}

.optional-label {
  display: inline-block;
  margin-left: 8px;
  border-radius: 999px;
  padding: 3px 8px;
  background: var(--neutral-soft);
  color: var(--neutral);
  font-size: .66em;
  vertical-align: middle;
}

.transport-time-field {
  width: min(100%, 560px);
  margin: 0 auto;
}

.transport-time-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.transport-time-input {
  display: grid;
  gap: 8px;
}

.subfield-label {
  color: var(--muted);
  font-size: .86rem;
  font-weight: 700;
}

@media (max-width: 520px) {
  .transport-time-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
}

.range-duration-card {
  width: 100%;
  padding: clamp(26px, 5vw, 46px);
}

.range-duration-card .result-label { min-height: 0; }

.range-duration-card .duration-value {
  margin: 20px 0 12px;
  font-size: clamp(2.5rem, 8vw, 5.3rem);
  letter-spacing: -.025em;
  white-space: normal;
}

.mask-seal-note {
  max-width: 760px;
  margin: 18px auto 0;
  color: var(--text);
  font-size: .98rem;
}

.transport-assessment[hidden] { display: none; }

@media (max-width: 660px) {
  .title-with-icon {
    align-items: flex-start;
    text-align: left;
  }
  .bipap-image {
    width: 76px;
    height: 68px;
    margin-top: 2px;
  }
  .title-with-icon .patient-type,
  .title-with-icon .subtitle { text-align: left; }
  .range-duration-card .duration-value { font-size: clamp(2.15rem, 12vw, 3.5rem); }
}
.results-panel > .range-duration-card { margin-top: 2px; }


/* Version 0.3 transport decision presentation */
.transport-decision { padding: 20px; }
.recommendation-content { flex: 1; min-width: 0; }
.assessment-kicker {
  margin-bottom: 5px;
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: currentColor;
}
.transport-decision .recommendation-title {
  font-size: 1.12rem;
  line-height: 1.25;
}
.assessment-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 13px;
}
.assessment-metrics > div {
  border: 1px solid color-mix(in srgb, currentColor 28%, transparent);
  border-radius: 12px;
  padding: 12px 14px;
  background: color-mix(in srgb, var(--panel) 74%, transparent);
}
.assessment-metrics span {
  display: block;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 750;
}
.assessment-metrics strong {
  display: block;
  margin-top: 4px;
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1.1;
}
.assessment-action {
  margin: 13px 0 0;
  color: var(--text);
  font-weight: 750;
}
@media (max-width: 600px) {
  .assessment-metrics { grid-template-columns: 1fr; }
}

/* Version 0.4 transport assessment refinement */
.assessment-metrics-single {
  display:flex;
  justify-content:center;
  margin:22px 0;
}
.assessment-metrics-single > div{
  width:360px;
  max-width:90%;
  border:1px solid var(--border);
  border-radius:16px;
  padding:18px;
  background:var(--surface);
  text-align:center;
}
.assessment-metrics-single span{
  display:block;
  font-size:.95rem;
  font-weight:700;
  color:var(--muted);
  margin-bottom:10px;
}
.assessment-metrics-single strong{
  display:block;
  font-size:2.4rem;
  line-height:1;
  font-weight:800;
  color:var(--text);
}

/* v0.4.1: exact centering for status SVGs */
.range-symbol,
.recommendation-icon {
  position: relative;
}
.range-symbol > svg,
.recommendation-icon > svg {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: 0;
  transform: translate(-50%, -50%);
  transform-origin: center;
}

/* v0.4.2: centered anticipated transport time card */
.transport-decision .recommendation-content {
  min-width: 0;
}

.transport-decision .assessment-metrics-single {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 18px 0;
}

.transport-decision .assessment-metrics-single > div {
  flex: 0 1 360px;
  width: 360px;
  max-width: 100%;
  margin: 0 auto;
  border: 1px solid color-mix(in srgb, currentColor 28%, transparent);
  border-radius: 14px;
  padding: 16px 20px;
  background: var(--surface);
  text-align: center;
}

.transport-decision .assessment-metrics-single span {
  display: block;
  margin: 0 0 8px;
  color: var(--muted);
  font-size: .95rem;
  font-weight: 700;
}

.transport-decision .assessment-metrics-single strong {
  display: block;
  margin: 0;
  color: var(--text);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
}

.transport-decision .assessment-action {
  text-align: center;
}

@media (max-width: 520px) {
  .transport-decision .assessment-metrics-single > div {
    flex-basis: 100%;
  }
}


/* v0.4.3: centimeter height input with imperial reference */
.height-conversion {
  display: block;
  min-height: 1.25em;
  margin-top: 7px;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 600;
  text-align: left;
}


/* Version 1.3: Clinical setup resources */
.clinical-resources {
  margin-bottom: 20px;
  padding: clamp(20px, 3vw, 30px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.resource-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 22px;
  margin-bottom: 22px;
}
.resource-kicker {
  margin: 0 0 4px;
  color: var(--blue);
  font-size: .76rem;
  font-weight: 900;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.resource-heading h2 {
  margin: 0;
  color: var(--navy-2);
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: .015em;
}
html[data-theme="dark"] .resource-heading h2 { color: #7fb4ff; }
.resource-intro {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  text-align: right;
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.resource-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-2);
}
.resource-card-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 13px;
  background: var(--blue-soft);
  color: var(--blue);
}
.resource-card-icon svg,
.resource-button svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.resource-card-icon svg { width: 26px; height: 26px; }
.resource-card-content { min-width: 0; flex: 1; }
.resource-card h3 {
  margin: 0;
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.3;
}
.resource-card p {
  margin: 7px 0 16px;
  color: var(--muted);
  font-size: .92rem;
}
.resource-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.resource-button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--blue);
  border-radius: 11px;
  font-size: .9rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform .16s ease, background-color .16s ease, color .16s ease;
}
.resource-button svg { width: 19px; height: 19px; flex: 0 0 auto; }
.guide-link { background: var(--surface); color: var(--blue); }
.video-link { background: var(--blue); color: white; }
.resource-button:hover { transform: translateY(-1px); }
.guide-link:hover { background: var(--blue-soft); }
.video-link:hover { background: var(--navy-2); }
.resource-button:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

@media (max-width: 840px) {
  .resource-grid { grid-template-columns: 1fr; }
}
@media (max-width: 660px) {
  .resource-heading { align-items: flex-start; flex-direction: column; gap: 8px; }
  .resource-intro { text-align: left; }
}
@media (max-width: 480px) {
  .resource-card { padding: 17px; }
  .resource-card-icon { width: 42px; height: 42px; }
  .resource-actions { display: grid; grid-template-columns: 1fr; }
  .resource-button { width: 100%; }
}