/* ==========================================================================
   Claude KYC — Design System
   Single stylesheet, no build step, no external dependency.
   Authored for a payments/verification product: quiet, dense, legible.
   ========================================================================== */

/* --- 1. Tokens ----------------------------------------------------------- */
:root {
  /* Neutral ramp — warm-neutral, not blue-tinted. */
  --bg:            #0b0b0d;
  --bg-sunk:       #08080a;
  --surface:       #121215;
  --surface-2:     #17171b;
  --surface-3:     #1e1e23;
  --border:        #26262c;
  --border-strong: #34343c;

  /* Text — three steps only. */
  --text:          #ededf0;
  --text-2:        #a3a3ac;
  --text-3:        #6d6d78;

  /* Single accent. Warm clay, tied to the product context. */
  --accent:        #d97757;   /* 文字 / 边框 / 强调 */
  --accent-solid:  #cf6d4b;   /* 大面积填充（按钮） */
  --accent-hi:     #e69375;
  --accent-lo:     #b45c3e;
  --accent-wash:   rgba(217, 119, 87, 0.10);
  --accent-line:   rgba(217, 119, 87, 0.34);

  /* Semantic — used only to mean something. */
  --ok:            #4ac26b;
  --ok-wash:       rgba(74, 194, 107, 0.10);
  --ok-line:       rgba(74, 194, 107, 0.28);
  --warn:          #d8a03a;
  --warn-wash:     rgba(216, 160, 58, 0.10);
  --warn-line:     rgba(216, 160, 58, 0.28);
  --danger:        #ec6a5e;
  --danger-wash:   rgba(236, 106, 94, 0.10);
  --danger-line:   rgba(236, 106, 94, 0.28);

  /* Type */
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;

  /* Radius — three steps. */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  /* Motion */
  --t: 140ms cubic-bezier(0.2, 0, 0.2, 1);

  /* Layout */
  --gutter: 24px;
  --measure: 68ch;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- 2. Reset ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

img, svg { display: block; max-width: 100%; }

/* [hidden] 是 UA 样式，会被组件类上的 display 覆盖（如 .btn 的 inline-flex）。
   这里提权，保证 hidden 属性在任何元素上都真正生效。 */
[hidden] { display: none !important; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
h1, h2, h3, h4 { font-weight: 600; line-height: 1.25; letter-spacing: -0.011em; }

/* One shared focus ring. Keyboard only — never punishes mouse users. */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

::selection { background: var(--accent-line); color: #fff; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--surface-3);
  border: 3px solid var(--bg);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }

/* --- 3. Layout primitives ------------------------------------------------ */
.wrap {
  width: 100%;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 820px; }

.page {
  flex: 1 0 auto;
  padding-block: 72px 96px;
}

.stack     { display: grid; gap: 16px; }
.stack--lg { display: grid; gap: 32px; }
.stack--xl { display: grid; gap: 48px; }

/* minmax(0, 1fr) 而非 1fr：grid 轨道的默认最小值是 auto（内容宽度），
   长 URL、等宽数字等会把轨道撑破视口。下同。 */
.grid-3 { display: grid; gap: 16px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { display: grid; gap: 12px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-3 > *, .grid-4 > * { min-width: 0; }

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .page { padding-block: 44px 64px; }
}

/* --- 4. Header ----------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 11, 13, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.site-header__bar {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 58px;
}
.site-header__bar > * { min-width: 0; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand img {
  width: 26px;
  height: 26px;
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
}
.brand span { color: var(--text-2); font-weight: 450; }

.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; margin-right: 10px; }
.nav a {
  padding: 6px 10px;
  border-radius: var(--r-sm);
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--t), background var(--t);
}
.nav a:hover { color: var(--text); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }

.lang {
  display: inline-flex;
  align-items: center;
  flex: none;
  padding: 2px;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.lang a, .lang span {
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-3);
  transition: color var(--t), background var(--t);
}
.lang a:hover { color: var(--text-2); }
.lang [aria-current="true"] { background: var(--surface-3); color: var(--text); }

@media (max-width: 720px) {
  .nav a { padding: 6px 8px; font-size: 13px; }
  .brand span { display: none; }
}

/* 窄屏：导航换到第二行并允许横向滚动。
   否则 flex 子项无法收缩到内容宽度以下，会把整个页面撑出视口。 */
@media (max-width: 620px) {
  .site-header__bar {
    height: auto;
    flex-wrap: wrap;
    padding-block: 10px;
    row-gap: 8px;
  }
  .nav {
    order: 3;
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    margin: 0 calc(var(--gutter) * -1);
    padding-inline: var(--gutter);
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { flex: none; }
  .lang { margin-left: auto; order: 2; }
}

/* --- 5. Typography blocks ------------------------------------------------ */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
}
.eyebrow::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 99px;
  background: var(--accent);
  flex: none;
}

.hero { max-width: 40rem; }
.hero h1 {
  font-size: clamp(30px, 4.6vw, 44px);
  letter-spacing: -0.024em;
  line-height: 1.12;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p {
  margin-top: 16px;
  max-width: var(--measure);
  color: var(--text-2);
  font-size: 16px;
  line-height: 1.65;
}

.page-title { font-size: clamp(26px, 3.4vw, 34px); letter-spacing: -0.02em; }
.page-title + p { margin-top: 12px; color: var(--text-2); max-width: var(--measure); }

.section-title { font-size: 20px; letter-spacing: -0.015em; }
.prose { color: var(--text-2); max-width: var(--measure); }
.prose strong { color: var(--text); font-weight: 550; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.prose a:hover { color: var(--accent-hi); }

.rule { border: 0; border-top: 1px solid var(--border); }

/* --- 6. Surfaces --------------------------------------------------------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
}
.panel__head > div { min-width: 0; }
.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.panel__head h2 { font-size: 15px; font-weight: 600; }
.panel__head p  { font-size: 13px; color: var(--text-3); margin-top: 2px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 20px;
}
.card h3 { font-size: 15px; margin-bottom: 6px; }
.card p  { font-size: 14px; color: var(--text-2); line-height: 1.6; }

@media (max-width: 640px) { .panel { padding: 18px; } }

/* --- 7. Stats ------------------------------------------------------------ */
.stat {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  padding: 16px 18px;
}
.stat__value {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat__label { font-size: 13px; color: var(--text-3); margin-top: 2px; }

/* --- 8. Steps ------------------------------------------------------------ */
.step { display: flex; gap: 14px; align-items: flex-start; }
.step > div { min-width: 0; }
.step__n {
  flex: none;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 99px;
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-2);
}
.step h3 { font-size: 14px; margin-bottom: 4px; }
.step p  { font-size: 14px; color: var(--text-2); }

/* --- 9. Plan selector ---------------------------------------------------- */
.plans { display: grid; gap: 12px; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.plans > * { min-width: 0; }
@media (max-width: 860px) { .plans { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.plan {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  text-align: left;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  cursor: pointer;
  transition: border-color var(--t), background var(--t), transform var(--t);
}
.plan:hover { border-color: var(--border-strong); background: var(--surface-3); }
.plan:active { transform: translateY(1px); }
.plan[aria-checked="true"] {
  border-color: var(--accent-line);
  background: var(--accent-wash);
}
.plan[aria-checked="true"] .plan__unit { color: var(--accent); }

.plan__count { font-size: 15px; font-weight: 600; }
.plan__total {
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.plan__unit { font-size: 13px; color: var(--text-3); }
.plan__total .u { font-family: var(--sans); font-size: 14px; color: var(--text-2); margin-left: 4px; }
.plan__tag {
  position: absolute;
  top: -1px; right: 12px;
  transform: translateY(-50%);
  padding: 1px 7px;
  border-radius: 99px;
  background: var(--accent-solid);
  color: #1b0f0a;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* --- 10. Forms ----------------------------------------------------------- */
.field { display: grid; gap: 7px; }
.field > label { font-size: 13px; font-weight: 550; color: var(--text-2); }
.field .hint { font-size: 12px; color: var(--text-3); }

.input, .select {
  width: 100%;
  padding: 11px 13px;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-size: 14px;
  color: var(--text);
  transition: border-color var(--t), box-shadow var(--t);
}
.input::placeholder { color: var(--text-3); }
.input:hover, .select:hover { border-color: var(--border-strong); }
.input:focus, .select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-wash);
}
.input[type="url"], .input--mono { font-family: var(--mono); font-size: 13px; }

.select {
  appearance: none;
  padding-right: 38px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%236d6d78' stroke-width='1.6' stroke-linecap='round'%3E%3Cpath d='M4 6.5 8 10.5 12 6.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
}
.select option { background: var(--surface); color: var(--text); }

/* --- 11. Buttons --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-size: 14px;
  font-weight: 550;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--t), border-color var(--t), color var(--t), opacity var(--t);
}
.btn--primary { background: var(--accent-solid); color: #1b0f0a; }
.btn--primary:hover { background: var(--accent); }
.btn--primary:active { background: var(--accent-lo); color: #fff; }
.btn--quiet {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text);
}
.btn--quiet:hover { background: var(--surface-3); border-color: var(--border-strong); }
.btn--link {
  padding: 0;
  background: none;
  color: var(--accent);
  font-size: 13px;
}
.btn--link:hover { color: var(--accent-hi); text-decoration: underline; text-underline-offset: 2px; }
.btn--block { width: 100%; padding-block: 13px; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

/* --- 12. Console --------------------------------------------------------- */
.console {
  height: 144px;
  overflow-y: auto;
  padding: 14px;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--text-2);
  overscroll-behavior: contain;
}
.console__line { display: flex; gap: 8px; }
.console__ts   { color: var(--text-3); flex: none; }
.console__line--ok    { color: var(--ok); }
.console__line--warn  { color: var(--warn); }
.console__line--error { color: var(--danger); }

/* --- 13. Badges & callouts ----------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 12px;
  font-weight: 550;
  color: var(--text-2);
}
.badge--ok     { color: var(--ok);     background: var(--ok-wash);     border-color: var(--ok-line); }
.badge--warn   { color: var(--warn);   background: var(--warn-wash);   border-color: var(--warn-line); }
.badge--danger { color: var(--danger); background: var(--danger-wash); border-color: var(--danger-line); }

.method {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 7px;
  border-radius: var(--r-sm);
}
.method--post { color: var(--ok);   background: var(--ok-wash);   border: 1px solid var(--ok-line); }
.method--get  { color: var(--accent); background: var(--accent-wash); border: 1px solid var(--accent-line); }

.callout {
  display: flex;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  font-size: 14px;
  color: var(--text-2);
}
.callout svg { flex: none; width: 18px; height: 18px; margin-top: 2px; }
.callout strong { display: block; color: var(--text); font-weight: 600; margin-bottom: 3px; }
.callout--warn { border-color: var(--warn-line); background: var(--warn-wash); }
.callout--warn svg { color: var(--warn); }
.callout--info svg { color: var(--accent); }

/* --- 14. Code ------------------------------------------------------------ */
code {
  font-family: var(--mono);
  font-size: 0.9em;
  padding: 1.5px 5px;
  border-radius: 4px;
  background: var(--surface-3);
  color: var(--text);
}
.endpoint {
  display: block;
  padding: 10px 13px;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  word-break: break-all;
  user-select: all;
}
.pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-2);
}
.pre code { background: none; padding: 0; color: inherit; }

/* --- 15. Tables ---------------------------------------------------------- */
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-md); }
.table { font-size: 14px; min-width: 520px; }
.table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-3);
  white-space: nowrap;
}
.table td { padding: 12px 14px; border-top: 1px solid var(--border); color: var(--text-2); vertical-align: top; }
.table tbody tr:first-child td { border-top: 0; }
.table .mono { font-family: var(--mono); font-size: 13px; color: var(--text); }
.table .num  { font-family: var(--mono); color: var(--text); }
.table .right { text-align: right; }

/* --- 16. Definition list (API params) ------------------------------------ */
.req  { color: var(--danger); font-size: 12px; font-weight: 600; }
.opt  { color: var(--text-3); font-size: 12px; font-weight: 600; }

/* --- 17. FAQ ------------------------------------------------------------- */
.faq { border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface); }
.faq + .faq { margin-top: 10px; }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 550;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  flex: none;
  width: 9px; height: 9px;
  border-right: 1.5px solid var(--text-3);
  border-bottom: 1.5px solid var(--text-3);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform var(--t);
}
.faq[open] summary::after { transform: rotate(-135deg) translate(-2px, -2px); }
.faq[open] summary { color: var(--text); }
.faq__body {
  padding: 0 18px 18px;
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: var(--measure);
}
.faq__body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }

/* --- 18. Modal ----------------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(6, 6, 8, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity var(--t);
}
.modal[hidden] { display: none; }
.modal.is-open { opacity: 1; }
.modal__panel {
  width: 100%;
  max-width: 420px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  box-shadow: 0 24px 60px -12px rgba(0, 0, 0, 0.7);
  transform: translateY(6px) scale(0.99);
  transition: transform var(--t);
}
.modal.is-open .modal__panel { transform: none; }
.modal__head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.modal__head h2 { font-size: 16px; }
.modal__head p  { font-size: 13px; color: var(--text-2); margin-top: 4px; }
.modal__close {
  flex: none;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 0; border-radius: var(--r-sm);
  background: none;
  color: var(--text-3);
  cursor: pointer;
  transition: background var(--t), color var(--t);
}
.modal__close:hover { background: var(--surface-3); color: var(--text); }

.qr {
  width: 156px; height: 156px;
  margin: 0 auto 18px;
  padding: 8px;
  background: #fff;
  border-radius: var(--r-md);
}
.qr img { width: 100%; height: 100%; border-radius: 4px; }

.copyrow {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.copyrow + .copyrow { margin-top: 10px; }
.copyrow__label { font-size: 12px; color: var(--text-3); }
.copyrow__body { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.copyrow__body > :first-child { min-width: 0; }
.copyrow__value {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
  user-select: all;
}
.copyrow__value--lead { font-size: 17px; color: var(--accent); }

.status-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
  font-size: 13px;
  color: var(--text-2);
}
.status-strip__timer { font-family: var(--mono); color: var(--text); }

.spinner {
  width: 13px; height: 13px;
  flex: none;
  border: 1.5px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 99px;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-mark {
  width: 44px; height: 44px;
  margin: 0 auto 16px;
  display: grid; place-items: center;
  border-radius: 99px;
  background: var(--ok-wash);
  border: 1px solid var(--ok-line);
  color: var(--ok);
}

/* --- 19. Toast ----------------------------------------------------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 70;
  transform: translate(-50%, 12px);
  padding: 10px 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  background: var(--surface-2);
  box-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.6);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t), transform var(--t);
}
.toast.is-open { opacity: 1; transform: translate(-50%, 0); }

/* --- 20. CTA & footer ---------------------------------------------------- */
.cta > div { min-width: 0; }
.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
}
.cta h2 { font-size: 18px; }
.cta p  { font-size: 14px; color: var(--text-2); margin-top: 4px; }
@media (max-width: 640px) { .cta { flex-direction: column; align-items: flex-start; } }

.site-footer {
  flex: none;
  border-top: 1px solid var(--border);
  padding-block: 24px;
  font-size: 13px;
  color: var(--text-3);
}
.site-footer__bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a:hover { color: var(--text-2); }

/* --- 21. Auth ------------------------------------------------------------ */
.auth { flex: 1 0 auto; display: grid; place-items: center; padding: 48px 20px; }
.auth__card { width: 100%; max-width: 380px; }
.auth__brand { text-align: center; margin-bottom: 28px; }
.auth__brand img { width: 44px; height: 44px; margin: 0 auto 14px; border-radius: var(--r-md); border: 1px solid var(--border); }
.auth__brand h1 { font-size: 19px; }
.auth__brand p  { font-size: 14px; color: var(--text-2); margin-top: 4px; }

.checkbox { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text-2); cursor: pointer; }
.checkbox input { width: 15px; height: 15px; accent-color: var(--accent); cursor: pointer; }

/* --- 22. Utilities (deliberately few) ------------------------------------ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.muted     { color: var(--text-3); }
.mono      { font-family: var(--mono); }
.text-sm   { font-size: 13px; }
.accent    { color: var(--accent); }
.ok        { color: var(--ok); }