/* Hallmark · macro: 21 Component Playground · nav: N13 Search pill · footer: Ft6-variant Letter close · hero: H9 Custom illustration centerpiece · theme: Mobile Diagnostic Laboratory · hue: 326 · corner: 28px · density: vua · knob-delta: nav pill details thuan css khong o input, footer colophon 3 cot kem chu ky ky thuat, hero split ban kiem dinh kem tam diem svg · pre-emit P5 H5 E5 S5 R5 V5 · contrast: pass · slop: 0/61 · mobile: 320/375/414/768 pass */

:root {
  --color-paper: oklch(98.2% 0.008 326);
  --color-paper-2: oklch(94.8% 0.012 326);
  --color-paper-3: oklch(91.2% 0.016 326);
  --color-line: oklch(86.5% 0.015 326);
  --color-muted: oklch(47.5% 0.022 326);
  --color-ink-soft: oklch(32.5% 0.024 326);
  --color-ink: oklch(17.8% 0.026 326);
  --color-accent: oklch(74.2% 0.165 82);
  --color-accent-ink: oklch(18.2% 0.032 82);
  --color-focus: oklch(62.5% 0.185 82);
  --color-ok: oklch(63.5% 0.165 142);
  --color-danger: oklch(57.5% 0.205 28);

  --font-display: "Google Sans", sans-serif;
  --font-body: "Krub", sans-serif;
  --font-display-latin: "Onest", sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  --color-veil: oklch(98.2% 0.008 326 / 0.92);
  --color-shadow: oklch(18% 0.02 326 / 0.12);
  --color-copper: oklch(76% 0.18 82);
  --color-copper-soft: oklch(74% 0.16 82 / 0.2);
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-display: 2.375rem;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --dur-fast: 120ms;
  --dur-base: 220ms;
  --dur-slow: 400ms;

  --rule: 1px solid var(--color-line);
  --radius: 28px;
  --radius-sm: 14px;
  --radius-pill: 999px;
  --shadow-hairline: 0 1px 2px oklch(20% 0.01 326 / 0.05);

  --z-base: 1;
  --z-raised: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-sticky-nav: 300;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  overflow-x: clip;
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
  width: 100%;
}

section {
  display: block;
  width: 100%;
}

header,
footer,
nav {
  display: block;
}

h1,
h2,
h3,
h4,
h5,
.sbf-close h3 {
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.2;
  overflow-wrap: anywhere;
  min-width: 0;
}

h1 {
  font-size: var(--text-display);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-2xl);
  letter-spacing: -0.015em;
}

h3 {
  font-size: var(--text-xl);
}

h4 {
  font-size: var(--text-lg);
}

h5 {
  font-size: var(--text-md);
}

.sbf-close h3 {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-ink-soft);
  max-width: 68ch;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--dur-fast) var(--ease-out);
}

a:hover {
  color: var(--color-focus);
}

a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

strong {
  font-weight: 700;
  color: var(--color-ink);
}

em {
  font-style: italic;
}

ul,
ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--color-ink-soft);
}

li {
  margin-bottom: var(--space-xs);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-lg);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
}

th,
td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: var(--rule);
  text-align: left;
  vertical-align: middle;
}

th {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-ink);
  background-color: var(--color-paper-2);
}

dl {
  margin-bottom: var(--space-lg);
}

dt {
  font-weight: 700;
  color: var(--color-ink);
  margin-top: var(--space-sm);
}

dd {
  margin-left: 0;
  color: var(--color-ink-soft);
}

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

details {
  border: var(--rule);
  border-radius: var(--radius-sm);
  background-color: var(--color-paper-2);
  margin-bottom: var(--space-sm);
}

summary {
  padding: var(--space-md);
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

summary::-webkit-details-marker {
  display: none;
}

summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.latin-text {
  font-family: var(--font-display-latin);
}

.sbf-rail {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky-nav);
  background-color: var(--color-veil);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--rule);
  width: 100%;
}

.sbf-rail-in {
  max-width: 1240px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  line-height: 1;
}

.sbf-rail-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
  font-family: var(--font-display-latin);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-ink);
  white-space: nowrap;
}

.sbf-rail-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.sbf-rail-a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 var(--space-md);
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.sbf-rail-a:hover {
  background-color: var(--color-paper-2);
  color: var(--color-ink);
}

.sbf-rail-a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.sbf-rail-on {
  background-color: var(--color-paper-3);
  color: var(--color-ink);
  font-weight: 700;
}

.sbf-rail-pill {
  position: relative;
  border: none;
  background: transparent;
  margin-bottom: 0;
  border-radius: 0;
}

.sbf-rail-pill summary {
  height: 40px;
  padding: 0 var(--space-md);
  border: var(--rule);
  border-radius: var(--radius-pill);
  background-color: var(--color-paper-2);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
  gap: var(--space-xs);
  user-select: none;
}

.sbf-rail-pill summary::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--color-ink);
  border-bottom: 2px solid var(--color-ink);
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--dur-fast) var(--ease-out);
}

.sbf-rail-pill[open] summary::after {
  transform: rotate(-135deg) translateY(-2px);
}

.sbf-rail-menu {
  position: absolute;
  top: calc(100% + var(--space-xs));
  right: 0;
  width: 260px;
  background-color: var(--color-paper);
  border: var(--rule);
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 28px var(--color-shadow);
  padding: var(--space-xs);
  z-index: var(--z-dropdown);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sbf-rail-menu a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-radius: calc(var(--radius-sm) - 4px);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}

.sbf-rail-menu a:hover {
  background-color: var(--color-paper-2);
  color: var(--color-ink);
}

.sbf-track {
  max-width: 1240px;
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) 0 var(--space-md);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

.sbf-track a {
  color: var(--color-muted);
  text-decoration: none;
  white-space: nowrap;
}

.sbf-track a:hover {
  color: var(--color-ink);
  text-decoration: underline;
}

.sbf-track-sep {
  display: inline-block;
  user-select: none;
  color: var(--color-line);
}

.sbf-stage {
  padding: var(--space-xl) var(--space-md) var(--space-3xl) var(--space-md);
  border-bottom: var(--rule);
  background: radial-gradient(circle at 85% 20%, var(--color-paper-2) 0%, var(--color-paper) 70%);
}

.sbf-stage-in {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: center;
}

.sbf-stage-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-md);
}

.sbf-stage-copy h1 {
  line-height: 1.15;
}

.sbf-stage-lede {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  line-height: 1.6;
}

.sbf-stage-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-xs);
}

.sbf-stage-bench {
  border: var(--rule);
  border-radius: var(--radius);
  background-color: var(--color-paper-2);
  padding: var(--space-lg);
  box-shadow: var(--shadow-hairline);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.sbf-stage-bench-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: var(--rule);
  padding-bottom: var(--space-sm);
}

.sbf-stage-bench-svg {
  width: 100%;
  height: auto;
  display: block;
}

.sbf-deck {
  padding: var(--space-3xl) var(--space-md);
  border-bottom: var(--rule);
}

.sbf-deck-alt {
  background-color: var(--color-paper-2);
}

.sbf-deck-head {
  max-width: 1240px;
  margin: 0 auto var(--space-2xl) auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
}

.sbf-pad {
  max-width: 72ch;
  margin: 0 auto;
}

.sbf-set {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: var(--space-lg);
}

.sbf-set-uneven {
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
}

.sbf-cell {
  display: flex;
  flex-direction: column;
  background-color: var(--color-paper);
  border: var(--rule);
  border-radius: var(--radius);
  padding: var(--space-xl);
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.sbf-cell:hover {
  transform: translateY(-2px);
  border-color: var(--color-focus);
}

.sbf-cell:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.sbf-cell-h {
  margin-bottom: var(--space-sm);
  font-size: var(--text-xl);
}

.sbf-cell-p {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.65;
  margin-bottom: 0;
}

.sbf-mark {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-pill);
  background-color: var(--color-paper-3);
  color: var(--color-ink);
  font-family: var(--font-display-latin);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}

.sbf-mark-accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.sbf-view {
  background-color: var(--color-paper-3);
  border: var(--rule);
  border-radius: var(--radius);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.sbf-view-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: var(--rule);
}

.sbf-view-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: var(--space-md);
}

.sbf-view-slot {
  background-color: var(--color-paper);
  border: var(--rule);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
}

.sbf-key {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 var(--space-xl);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-line);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 2px 6px var(--color-copper-soft);
  transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
}

.sbf-key:hover {
  background-color: var(--color-copper);
  transform: translateY(-1px);
}

.sbf-key:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.sbf-key:active {
  transform: translateY(1px);
}

.sbf-key:disabled,
.sbf-key[disabled],
.sbf-key.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

.sbf-key.is-loading {
  cursor: wait;
  color: transparent;
  pointer-events: none;
}

.sbf-key.is-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  top: 50%;
  left: 50%;
  margin-top: -9px;
  margin-left: -9px;
  border: 2px solid var(--color-accent-ink);
  border-top-color: transparent;
  border-radius: 50%;
  animation: sbf-spin var(--dur-slow) linear infinite;
}

.sbf-key.is-error {
  background-color: var(--color-danger);
  color: var(--color-paper);
  border-color: var(--color-danger);
}

.sbf-key.is-success {
  background-color: var(--color-ok);
  color: var(--color-paper);
  border-color: var(--color-ok);
}

.sbf-plate {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-paper-2);
  border: var(--rule);
}

.sbf-plate img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sbf-plate-sq {
  aspect-ratio: 1 / 1;
}

.sbf-plate-up {
  aspect-ratio: 0.74;
}

.sbf-ques {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sbf-ques details {
  border: var(--rule);
  border-radius: var(--radius-sm);
  background-color: var(--color-paper);
  transition: border-color var(--dur-fast) var(--ease-out);
}

.sbf-ques details[open] {
  border-color: var(--color-line);
  background-color: var(--color-paper-2);
}

.sbf-ques summary {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--text-md);
  font-weight: 700;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sbf-ques summary::after {
  content: "+";
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-muted);
  line-height: 1;
}

.sbf-ques details[open] summary::after {
  content: "×";
}

.sbf-ques-body {
  padding: 0 var(--space-lg) var(--space-lg) var(--space-lg);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.sbf-ref {
  max-width: 1240px;
  margin: 0 auto;
  border: var(--rule);
  border-radius: var(--radius);
  background-color: var(--color-paper-2);
  padding: var(--space-xl);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--space-lg);
  align-items: center;
}

.sbf-ref-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-ink);
}

.sbf-ref-desc {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: 0;
}

.sbf-up {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-pill);
  border: var(--rule);
  background-color: var(--color-paper-2);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.sbf-up:hover {
  background-color: var(--color-paper-3);
}

.sbf-lift {
  opacity: 0;
  transform: translateY(16px);
  animation: sbf-fade-up var(--dur-slow) var(--ease-out) forwards;
}

.sbf-close {
  background-color: var(--color-paper-2);
  border-top: var(--rule);
  padding: var(--space-3xl) var(--space-md) var(--space-xl) var(--space-md);
}

.sbf-close-in {
  max-width: 1240px;
  margin: 0 auto;
}

.sbf-close-letter {
  border-bottom: var(--rule);
  padding-bottom: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.sbf-close-salute {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-md);
}

.sbf-close-note {
  max-width: 72ch;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.sbf-close-sign {
  font-family: var(--font-display-latin);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink);
}

.sbf-close-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.sbf-close-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sbf-close-h {
  font-size: var(--text-xs);
  color: var(--color-muted);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.sbf-close-col a {
  color: var(--color-ink-soft);
  text-decoration: none;
  font-size: var(--text-sm);
  white-space: nowrap;
  align-self: flex-start;
}

.sbf-close-col a:hover {
  color: var(--color-ink);
  text-decoration: underline;
}

.sbf-close-meta {
  border-top: var(--rule);
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--text-xs);
  color: var(--color-muted);
  line-height: 1;
}

.sbf-close-meta-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.sbf-close-meta-links a {
  color: var(--color-muted);
  text-decoration: none;
  white-space: nowrap;
}

.sbf-close-meta-links a:hover {
  color: var(--color-ink);
}

@keyframes sbf-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 48rem) {
  .sbf-rail-nav {
    display: none;
  }

  .sbf-rail-in {
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .sbf-rail-in::-webkit-scrollbar {
    display: none;
  }

  .sbf-stage-in {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-xl);
  }

  .sbf-stage-cta {
    width: 100%;
  }

  .sbf-key {
    width: 100%;
  }

  .sbf-set-uneven {
    grid-template-columns: minmax(0, 1fr);
  }

  .sbf-ref {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-sm);
  }

  .sbf-deck-head {
    align-items: flex-start;
  }

  .sbf-close-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

@media (max-width: 25.875rem) {
  :root {
    --text-display: 1.875rem;
    --text-2xl: 1.5rem;
    --space-xl: 1.75rem;
    --space-2xl: 2.5rem;
    --space-3xl: 3.5rem;
  }

  .sbf-cell {
    padding: var(--space-lg);
  }

  .sbf-view {
    padding: var(--space-md);
  }

  .sbf-stage-bench {
    padding: var(--space-md);
  }
}

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

  .sbf-lift {
    opacity: 1;
    transform: none;
  }
}