@charset "UTF-8";
:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Malgun Gothic", sans-serif;
  font-synthesis: none;
  --bg: #e8ecef; --ink: #1e2c3d; --muted: #475566; --line: #c5cdd5;
  --accent: #43647f; --button: #28496f; --button-hover: #305780;
  --select: #dce4eb; --ambient: #91b0bd24; --shadow: #1326410d;
  background: var(--bg); color: var(--ink);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101823; --ink: #e7edf5; --muted: #a1aec0; --line: #2c3a4c;
  --accent: #8cabbf; --button: #2e517e; --button-hover: #375f90;
  --select: #27364a; --ambient: #304c6426; --shadow: #00000033;
}
/* Keep scrolling available without a width-changing scrollbar. Older browsers
   that cannot hide it retain a permanent gutter instead of shifting the page. */
html { overflow-y: scroll; scrollbar-width: none; -ms-overflow-style: none; }
html::-webkit-scrollbar { display: none; width: 0; height: 0; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { position: relative; isolation: isolate; margin: 0; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding-block: 24px 38px; background: radial-gradient(ellipse at 50% 35%, var(--ambient), transparent 58%); -webkit-user-select: none; user-select: none; }
button, a, summary { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
a, img { -webkit-user-drag: none; }
h1, h2, h3, p { margin: 0; word-break: keep-all; overflow-wrap: anywhere; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.shell { width: min(1120px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: fixed; top: -100px; left: 16px; padding: 14px 20px; background: var(--button); color: #fff; z-index: 5; }
.skip-link:focus { top: 12px; }
.header { position: relative; min-height: 100px; display: grid; grid-template-columns: 76px minmax(0, 1fr) 96px; align-items: center; column-gap: 28px; }
.header-center { min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 16px; }
.header-status { display: grid; place-items: center; height: 33px; }
.header-rail { position: relative; height: 1px; overflow: hidden; background: var(--line); }
.header-rail-left { transform: scaleX(-1); }
.header-rail::after { content: ""; position: absolute; top: 0; bottom: 0; left: -28%; width: 28%; opacity: 0; background: linear-gradient(90deg, transparent, var(--header-glint) 70%, transparent); pointer-events: none; }
.brand { display: grid; place-items: center; width: 76px; height: 72px; border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 4px 14px var(--shadow); transition: transform .25s, box-shadow .25s; }
.brand:hover { transform: translateY(-1px); box-shadow: 0 6px 18px var(--shadow); }
.brand img { display: block; width: 64px; height: 60px; object-fit: contain; }
:root:not([data-theme="dark"]) .brand { background: #f3f5f6; }
[data-theme="dark"] .brand { background: #eef2f6; }
.theme-switch { display: flex; gap: 8px; }
.theme-switch button { padding: 0; display: grid; place-items: center; width: 44px; height: 44px; border: 0; border-radius: 50%; color: var(--muted); background: transparent; cursor: pointer; transition: color .2s, background .2s; }
.theme-switch svg { width: 17px; height: 17px; }
.theme-switch [data-theme-choice="dark"] svg { transform: translate(.3px, -.3px); }
.theme-switch button[aria-pressed="true"] { color: var(--ink); background: var(--select); }
main { display: flex; flex-direction: column; }
.utility, .support-area { --column-gap: 56px; }
.utility { position: relative; overflow: hidden; isolation: isolate; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: center; gap: var(--column-gap); text-align: left; padding: 26px 32px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: inset 0 1px 0 var(--edge), 0 18px 44px var(--shadow); }
.utility-copy { min-width: 0; text-align: center; }
.utility .download-action, .utility .download-button, .utility .guidance { margin-inline: auto; }
.utility .download-information { justify-content: center; }
:root { --focus-halo: #ffffff66; --focus-vignette: #425d7420; --header-glint: #2f6682; --surface: #f1f3f5; --edge: #ffffff66; --spot: #2f799f2b; --border-light: #346f9b88; --teal: #287866; --ambient-left: #4f789420; --ambient-right: #566f9520; --ambient-band: #5c86a51a; --guide-control: #e7ecf0; }
:root[data-theme="dark"] { --focus-halo: #46788730; --focus-vignette: #03091266; --header-glint: #d2ecf7; --surface: #172536; --ambient: #40668524; --edge: #accee918; --spot: #9cc5f01c; --border-light: #a3c5e590; --teal: #70aaa3; --ambient-left: #287d8130; --ambient-right: #3c5f9d2b; --ambient-band: #82a9d00c; --guide-control: #1b2d40; }
body::before { content: ""; position: fixed; inset: -15%; z-index: -1; pointer-events: none; background: radial-gradient(ellipse at 12% 18%, var(--ambient-left), transparent 52%), radial-gradient(ellipse at 88% 70%, var(--ambient-right), transparent 58%); }
body::after { content: ""; position: fixed; inset: -20%; z-index: -1; pointer-events: none; background: radial-gradient(ellipse at 50% 42%, var(--focus-halo), transparent 52%), radial-gradient(ellipse at 50% 42%, transparent 38%, var(--focus-vignette) 84%), linear-gradient(118deg, transparent 36%, var(--ambient-band) 49%, transparent 63%); }
:root:not([data-theme="dark"]) .utility { box-shadow: inset 0 1px 0 var(--edge), 0 12px 34px var(--shadow); }
.utility::before { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: 0; background: radial-gradient(350px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--spot), transparent 100%); transition: opacity .3s; }
@media (hover: hover) and (pointer: fine) and (min-width: 761px) and (prefers-reduced-motion: no-preference) {
  .utility[data-pointer="active"]::before, .utility[data-pointer="active"]::after { opacity: 1; }
}
@supports (mask-composite: exclude) {
  .utility::after { content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px; pointer-events: none; opacity: 0; background: radial-gradient(300px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--border-light), transparent 100%); mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); mask-composite: exclude; transition: opacity .3s; }
}
body, .utility, .theme-switch button { transition: background-color .3s, color .3s, border-color .3s; }
h1 { font-size: clamp(2.1rem, 4.4vw, 2.65rem); font-weight: 600; letter-spacing: -.045em; line-height: 1.35; }
.intro { font-size: 1rem; line-height: 1.8; color: var(--muted); margin-top: 11px; }
.download-action { margin: 21px auto 0; width: min(100%, 760px); }
.download-button { position: relative; isolation: isolate; overflow: hidden; width: min(100%, 400px); margin-inline: auto; min-height: 60px; display: flex; align-items: center; justify-content: center; gap: 12px; padding: 17px 20px; border: 1px solid #b8d8f54d; border-radius: 8px; color: #fff; background: var(--button); font-size: .9375rem; line-height: 1.4; font-weight: 600; cursor: pointer; box-shadow: inset 0 1px 0 #ffffff14, 0 6px 16px var(--shadow); transition: background .25s, transform .25s, box-shadow .25s, border-color .25s; }
.download-button:hover:not([aria-disabled="true"]) { background: var(--button-hover); transform: translateY(-2px); border-color: #ffffff44; box-shadow: 0 9px 24px var(--shadow); }
.download-button:active:not([aria-disabled="true"]) { transform: translateY(0); box-shadow: 0 2px 8px var(--shadow); }
.download-button[aria-disabled="true"] { cursor: not-allowed; opacity: .65; }
.download-button::after { content: ""; position: absolute; z-index: -1; inset: -50% auto -50% -60%; width: 32%; transform: skewX(-22deg); pointer-events: none; background: linear-gradient(90deg, transparent, #ffffff12, transparent); }
.download-information { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px 20px; margin-top: 12px; min-height: 24px; }
.download-meta { min-height: 22px; margin-top: 0; font-size: .8125rem; line-height: 1.7; color: var(--muted); }
.session { display: flex; align-items: center; justify-content: center; gap: 6px; margin: 0; padding: 0 12px; height: 33px; border: 1px solid var(--line); border-radius: 99px; background: var(--bg); white-space: nowrap; font-size: .8125rem; line-height: 1; color: var(--muted); }
.session-text { display: inline-flex; align-items: baseline; gap: 6px; }
.status-dot { position: relative; flex-shrink: 0; width: 5px; height: 5px; border-radius: 50%; background: var(--teal); margin-right: 2px; }
.status-dot::after { content: ""; position: absolute; inset: 0; border-radius: inherit; background: var(--teal); box-shadow: 0 0 4px 1px var(--teal), 0 0 7px 2px var(--teal); opacity: 0; pointer-events: none; }
/* Optical adjustment within the shared baseline; independent of viewport width. */
#session-count { position: relative; top: -1px; display: inline-block; min-width: 1ch; color: var(--ink); font-family: inherit; font-size: 12px; font-weight: 500; line-height: 1; font-variant-numeric: tabular-nums; }
.guidance { width: fit-content; max-width: 100%; margin: 15px auto 0; padding-top: 13px; border-top: 1px solid var(--line); font-size: .875rem; line-height: 1.8; color: var(--muted); }
.support-area { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--column-gap); margin-top: 28px; }
.quick-guide { min-width: 0; padding-left: calc(var(--column-gap) / 2); }
.support-area h2, .screen-guide figcaption { font-size: 1.0625rem; font-weight: 600; letter-spacing: -.025em; line-height: 1.5; }
.support-area h2 { margin: 0 0 16px; }
.steps { position: relative; list-style: none; padding: 0; margin: 0; }
.steps::before { content: ""; position: absolute; z-index: 0; left: 17px; top: 17.5px; bottom: 28.5px; width: 1px; background: var(--line); pointer-events: none; }
.steps li { display: flex; align-items: center; gap: 12px; position: relative; z-index: 1; min-height: 46px; padding: 0 0 10px; }
.step-number { display: block; flex-shrink: 0; width: 35px; height: 35px; overflow: visible; color: var(--accent); shape-rendering: geometricPrecision; }
.step-number .guide-index-ring { fill: var(--select); }
.step-number .guide-index-number { stroke-width: 1.1; }
.steps p { color: var(--muted); font-size: .9375rem; line-height: 1.7; }
.screen-guide { position: relative; min-width: 0; margin: 0; padding: 4px 0; }
/* Equal columns share a divider centered in the gap, independent of outer padding. */
.screen-guide::before, .help::before { content: ""; position: absolute; top: 0; bottom: 0; left: calc(var(--column-gap) / -2 - .5px); width: 1px; background: var(--line); pointer-events: none; }
.screen-guide figcaption { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: baseline; margin-bottom: 18px; }
.screen-guide figcaption span { color: var(--muted); font-size: .75rem; font-weight: 400; }
.screen-guide-body { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); align-items: center; gap: 12px; }
.screen-preview { position: relative; min-width: 0; width: 100%; max-width: 245px; border-radius: 8px; overflow: hidden; box-shadow: 0 8px 22px var(--shadow); transition: box-shadow .25s, transform .25s; }
.screen-preview img { display: block; width: 100%; height: auto; }
.screen-mark { position: absolute; left: 6.5%; width: 90%; border: 1px solid #9bbdd257; border-radius: 4px; pointer-events: none; transition: border-color .22s, background-color .22s; }
.screen-mark-id { top: 19%; height: 25%; }
.screen-mark-otp { top: 49%; height: 25%; }
.guide-index { display: block; flex-shrink: 0; width: 20px; height: 20px; overflow: visible; color: var(--accent); shape-rendering: geometricPrecision; }
.guide-index-ring { fill: transparent; stroke: var(--line); stroke-width: 1; vector-effect: non-scaling-stroke; }
.guide-index-number { fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
.screen-mark > .guide-index { position: absolute; right: 5px; top: 4px; color: #e4eef7; }
.screen-mark > .guide-index .guide-index-ring { fill: #243b4e; stroke: #66849a; }
.screen-guide[data-highlight="id"] .screen-mark-id, .screen-guide[data-highlight="otp"] .screen-mark-otp { border-color: #a0c1db; background: #779dbe16; }
.screen-legend { display: flex; min-width: 0; flex-direction: column; gap: 8px; }
.screen-legend button > span:last-child { min-width: 0; overflow-wrap: anywhere; }
.screen-legend button { display: flex; align-items: flex-start; gap: 9px; min-height: 60px; padding: 10px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--guide-control); color: var(--muted); text-align: left; cursor: pointer; transition: background-color .22s, border-color .22s; }
.screen-legend button:hover { border-color: var(--accent); }
.screen-legend button[aria-pressed="true"] { background: var(--select); border-color: var(--accent); box-shadow: inset 0 1px 0 var(--edge); }
.screen-legend .guide-index { margin-top: 1px; }
.screen-legend button[aria-pressed="true"] .guide-index { color: var(--ink); }
.screen-legend button[aria-pressed="true"] .guide-index-ring { stroke: var(--accent); }
.screen-legend strong { display: block; color: var(--ink); font-size: .875rem; font-weight: 500; line-height: 1.6; }
.screen-legend strong + span { display: block; margin-top: 4px; font-size: .8125rem; line-height: 1.7; word-break: keep-all; }
@media (hover: hover) and (prefers-reduced-motion: no-preference) { .screen-guide:hover .screen-preview { transform: translateY(-1px); box-shadow: 0 11px 26px var(--shadow); } }
.help { position: relative; min-width: 0; }
.help details { border-bottom: 1px solid var(--line); }
.help summary { display: flex; justify-content: space-between; align-items: center; gap: 18px; min-height: 48px; padding: 11px 0; font-size: .9375rem; line-height: 1.7; list-style: none; cursor: pointer; transition: color .2s; }
.help summary::-webkit-details-marker { display: none; }
.help summary:hover { color: var(--accent); }
.expand-icon { position: relative; width: 13px; height: 13px; flex-shrink: 0; color: var(--muted); transform-origin: center; transition: transform .25s; }
.expand-icon::before, .expand-icon::after { content: ""; position: absolute; background: currentColor; border-radius: 1px; }
.expand-icon::before { width: 11px; height: 1px; left: 1px; top: 6px; }
.expand-icon::after { width: 1px; height: 11px; left: 6px; top: 1px; transition: transform .25s; }
/* Use the requested state during height animation; retain native no-JS fallback. */
summary[aria-expanded="true"] .expand-icon, details[open] summary:not([aria-expanded]) .expand-icon { transform: rotate(180deg); }
summary[aria-expanded="true"] .expand-icon::after, details[open] summary:not([aria-expanded]) .expand-icon::after { transform: scaleY(0); }
.answer { color: var(--muted); font-size: .9375rem; line-height: 1.8; padding: 0 24px 16px 0; }
.help-contact { color: var(--muted); font-size: .8125rem; line-height: 1.7; margin-top: 16px; }
@media (prefers-reduced-motion: no-preference) {
  .status-dot::after { animation: status-glow 3.6s ease-in-out infinite; }
  @keyframes status-glow { 0%, 100% { opacity: 0; } 50% { opacity: .45; } }
  .header-rail::after { animation: header-reflection 7s cubic-bezier(.2,.55,.35,1) infinite; }
  @keyframes header-reflection {
    0%, 6% { left: -28%; opacity: 0; }
    11% { opacity: .9; }
    48%, 100% { left: 100%; opacity: 0; }
  }
  .utility { animation: arrive .45s ease-out both; }
  body::before { animation: ambient-drift 30s ease-in-out infinite alternate; }
  body::after { animation: ambient-band 36s ease-in-out infinite alternate; }
  .download-button:hover:not([aria-disabled="true"])::after { animation: sheen .65s ease-out; }
  .support-area { animation: arrive .45s .1s ease-out both; }
  details[open] .answer { animation: answer-in .26s ease-out both; }
  ::view-transition-old(root), ::view-transition-new(root) { animation-duration: 220ms; animation-timing-function: ease-out; }
  @keyframes sheen { to { left: 135%; } }
  @keyframes ambient-drift { to { transform: translate(5%, 3%); } }
  @keyframes ambient-band { to { transform: translate(-5%, 3%); } }
  @keyframes answer-in { from { opacity: 0; transform: translateY(0); } to { opacity: 1; transform: translateY(0); } }
  @keyframes arrive { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
}
@media (max-width: 900px) {
  .utility { --column-gap: 40px; padding-inline: 24px; }
  .screen-guide-body { grid-template-columns: 1fr; gap: 12px; }
  .screen-preview { width: min(100%, 245px); margin-inline: auto; }
  .screen-legend { flex-direction: row; gap: 6px; }
  .screen-legend button { flex: 1; min-width: 0; padding: 8px 5px; gap: 5px; }
  .support-area { grid-template-columns: 1fr; gap: 28px; }
  .quick-guide { padding-left: 0; }
  .help::before { display: none; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .header { min-height: 100px; }
  .utility { grid-template-columns: 1fr; gap: 26px; padding: 26px 18px 24px; border-radius: 12px; text-align: center; }
  .utility .download-action, .utility .download-button, .utility .guidance { margin-inline: auto; }
  .utility .download-information { justify-content: center; }
  .screen-guide::before { display: none; }
  .screen-guide { text-align: left; border-top: 1px solid var(--line); padding: 20px 0 0; }
  .support-area { grid-template-columns: 1fr; gap: 18px; margin-top: 24px; }
  .steps p { font-size: .875rem; }
  .screen-guide-body { grid-template-columns: 1fr; gap: 16px; }
  .screen-preview { width: min(100%, 277px); max-width: 277px; margin-inline: auto; }
  .screen-legend { flex-direction: row; gap: 6px; }
  .screen-legend button { padding: 9px 5px; gap: 4px; }
  .screen-legend .guide-index { width: 20px; height: 20px; }
  .screen-legend strong { font-size: .8125rem; }
  .screen-legend strong + span { font-size: .75rem; }
  .intro { max-width: 270px; margin-inline: auto; margin-top: 18px; }
  .download-action { margin-top: 22px; }
  .download-button { padding-inline: 12px; }
  .guidance { max-width: 260px; margin-inline: auto; }
  body::before, body::after { animation: none; }
  .help::before { display: none; }
}
@media (max-width: 600px) {
  .header { grid-template-columns: 76px minmax(0, 1fr) 96px; column-gap: 12px; row-gap: 12px; padding-bottom: 18px; }
  .header .theme-switch { grid-column: 3; grid-row: 1; }
  .header-center { grid-column: 1 / -1; grid-row: 2; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}