Componenti UI Medio

Web3 — Transaction Confirm / Signing Sheet

A glassy, wallet-style signing request sheet that slides up to confirm a swap, send, or token approval. Shows from/to addresses, a network badge, an animated swap visual, a fee and estimated-total breakdown, and an expandable panel revealing raw calldata, nonce and gas. Risk warnings flag dangerous approvals. Confirm spins through signing into a success state with a mock tx hash and explorer link; reject, Esc, and overlay clicks dismiss it with a full focus trap.

Apri in Lab

html css vanilla-js

Target: JS HTML

Codice

:root {
  --bg: #0a0b0f;
  --surface: #13151c;
  --surface-2: #1b1e27;
  --elevated: #23262f;
  --text: #e9ecf2;
  --muted: #8a90a2;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.16);
  --accent: #7c5cff;
  --accent-2: #00e0c6;
  --accent-glow: rgba(124, 92, 255, 0.45);
  --pos: #26d07c;
  --neg: #ff4d6d;
  --warn: #ffb347;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-pill: 999px;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1100px 700px at 12% -10%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 100% 0%, rgba(0, 224, 198, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: "Space Grotesk", system-ui, sans-serif;
  line-height: 1.5;
}

.mono {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.muted {
  color: var(--muted);
}

button {
  font-family: inherit;
  cursor: pointer;
}

:where(button, a, [tabindex]):focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* ===== Page / launcher ===== */
.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px 64px;
}

.page__hero {
  width: 100%;
  max-width: 460px;
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.brand__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 12px var(--accent-2);
}

.page__hero h1 {
  margin: 14px 0 6px;
  font-size: clamp(1.7rem, 6vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #fff, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page__hero > p {
  margin: 0 auto 26px;
  max-width: 340px;
  color: var(--muted);
  font-size: 0.95rem;
}

.actions {
  display: grid;
  gap: 12px;
  text-align: left;
}

.launch {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  backdrop-filter: blur(8px);
  color: var(--text);
  text-align: left;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.launch:hover {
  transform: translateY(-2px);
  border-color: var(--line-2);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.4);
}

.launch:active {
  transform: translateY(0);
}

.launch__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: 14px;
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(140deg, var(--accent), #5a3df0);
  box-shadow: 0 8px 22px var(--accent-glow);
}

.launch--send .launch__icon {
  background: linear-gradient(140deg, var(--accent-2), #08a896);
  box-shadow: 0 8px 22px rgba(0, 224, 198, 0.4);
}

.launch--approve .launch__icon {
  background: linear-gradient(140deg, var(--warn), #e8893a);
  box-shadow: 0 8px 22px rgba(255, 179, 71, 0.4);
}

.launch__body {
  display: grid;
}

.launch__body strong {
  font-weight: 600;
}

.launch__body small {
  color: var(--muted);
  font-size: 0.82rem;
}

/* ===== Overlay & sheet ===== */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  background: rgba(4, 5, 8, 0.62);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.24s ease;
}

.overlay.is-open {
  opacity: 1;
}

.sheet {
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: min(92vh, 760px);
  overflow-y: auto;
  padding: 10px 20px 20px;
  border: 1px solid var(--line-2);
  border-bottom: none;
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  background:
    linear-gradient(180deg, rgba(124, 92, 255, 0.1), transparent 120px),
    var(--surface);
  box-shadow: 0 -24px 60px rgba(0, 0, 0, 0.5);
  transform: translateY(18px);
  opacity: 0;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.24s ease;
}

@media (min-width: 560px) {
  .overlay {
    align-items: center;
    padding: 24px;
  }
  .sheet {
    border: 1px solid var(--line-2);
    border-radius: var(--r-lg);
  }
}

.overlay.is-open .sheet {
  transform: translateY(0);
  opacity: 1;
}

.sheet__grab {
  width: 44px;
  height: 5px;
  margin: 0 auto 10px;
  border-radius: var(--r-pill);
  background: var(--line-2);
}

@media (min-width: 560px) {
  .sheet__grab {
    display: none;
  }
}

.sheet__head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding-bottom: 16px;
}

.origin {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  flex: 1;
}

.origin__avatar {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 11px;
  background: var(--elevated);
  border: 1px solid var(--line);
  color: var(--accent-2);
  font-size: 1.1rem;
}

.origin__meta {
  display: grid;
  line-height: 1.25;
}

.origin__meta strong {
  font-size: 0.95rem;
  font-weight: 600;
}

.origin__url {
  font-size: 0.78rem;
  color: var(--accent-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.badge--net {
  color: var(--text);
}

.badge__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
}

.iconbtn {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.8rem;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.iconbtn:hover {
  color: var(--text);
  border-color: var(--line-2);
  background: var(--elevated);
}

/* ===== Hero card ===== */
.hero-card {
  position: relative;
  padding: 20px;
  border-radius: var(--r-md);
  background: var(--surface-2);
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: 0;
  padding: 1px;
  border-radius: inherit;
  background: linear-gradient(130deg, var(--accent), var(--accent-2));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.6;
  pointer-events: none;
}

.hero-card__label {
  margin: 0 0 14px;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.swap-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.tokleg {
  display: grid;
  justify-items: flex-start;
  gap: 3px;
  min-width: 0;
}

.tokleg--to {
  justify-items: flex-end;
  text-align: right;
}

.tok {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 700;
  color: #0a0b0f;
  margin-bottom: 4px;
}

.tok--eth {
  background: linear-gradient(150deg, #b9b2ff, #7c5cff);
  color: #fff;
}
.tok--usdc {
  background: linear-gradient(150deg, #4fd6ff, #2a7de1);
  color: #fff;
}
.tok--nova {
  background: linear-gradient(150deg, var(--accent-2), #08a896);
}

.tokleg__amt {
  font-size: 1.05rem;
  font-weight: 700;
}

.tokleg__sub {
  font-size: 0.78rem;
  color: var(--muted);
}

.swap-visual__arrow {
  font-size: 1.3rem;
  color: var(--accent);
  flex: none;
}

/* ===== Risk banner ===== */
.risk {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  padding: 12px 14px;
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 77, 109, 0.35);
  background: rgba(255, 77, 109, 0.1);
}

.risk__icon {
  flex: none;
  color: var(--neg);
  font-size: 1rem;
}

.risk__body {
  display: grid;
  gap: 2px;
  font-size: 0.84rem;
}

.risk__body strong {
  color: var(--neg);
  font-weight: 600;
}

.risk__body span {
  color: var(--muted);
}

/* ===== Rows ===== */
.rows {
  list-style: none;
  margin: 16px 0 0;
  padding: 6px 14px;
  border-radius: var(--r-md);
  background: var(--surface-2);
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}

.row:last-child {
  border-bottom: none;
}

.row__k {
  color: var(--muted);
  flex: none;
}

.row__v {
  text-align: right;
  word-break: break-all;
}

.row--total .row__k {
  color: var(--text);
  font-weight: 600;
}

.row--total .row__v {
  color: var(--accent-2);
  font-weight: 700;
}

/* ===== Details expander ===== */
.details {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.details__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 14px;
  border: none;
  background: var(--surface-2);
  color: var(--text);
  font-size: 0.86rem;
  font-weight: 500;
  transition: background 0.15s;
}

.details__toggle:hover {
  background: var(--elevated);
}

.details__chev {
  transition: transform 0.2s ease;
  color: var(--muted);
}

.details__toggle[aria-expanded="true"] .details__chev {
  transform: rotate(180deg);
}

.details__panel {
  padding: 14px;
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.18);
}

.data-grid {
  margin: 0 0 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.data-grid > div {
  display: grid;
  gap: 2px;
}

.data-grid dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.data-grid dd {
  margin: 0;
  font-size: 0.88rem;
}

.data-grid__label {
  margin: 0 0 6px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.calldata {
  margin: 0;
  padding: 12px;
  border-radius: var(--r-sm);
  background: #0c0d12;
  border: 1px solid var(--line);
  font-size: 0.74rem;
  line-height: 1.6;
  color: var(--accent-2);
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}

.copybtn {
  margin-top: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--text);
  font-size: 0.8rem;
  transition: background 0.15s, border-color 0.15s;
}

.copybtn:hover {
  background: var(--elevated);
  border-color: var(--accent);
}

/* ===== Center states (signing / success) ===== */
.state--center {
  display: grid;
  justify-items: center;
  gap: 8px;
  padding: 38px 10px 26px;
  text-align: center;
}

.state--center strong {
  font-size: 1.1rem;
  font-weight: 600;
}

.spinner {
  width: 54px;
  height: 54px;
  margin-bottom: 8px;
  border-radius: 50%;
  border: 3px solid var(--line-2);
  border-top-color: var(--accent);
  border-right-color: var(--accent-2);
  animation: spin 0.9s linear infinite;
}

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

.check {
  width: 60px;
  height: 60px;
  margin-bottom: 8px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(38, 208, 124, 0.14);
  border: 1px solid rgba(38, 208, 124, 0.4);
}

.check svg {
  width: 34px;
  height: 34px;
  fill: none;
  stroke: var(--pos);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.check svg path {
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: draw 0.5s 0.1s ease forwards;
}

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

.hash {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--accent-2);
  text-decoration: none;
  font-size: 0.85rem;
  transition: border-color 0.15s, background 0.15s;
}

.hash:hover {
  border-color: var(--accent-2);
  background: var(--elevated);
}

.hash__ext {
  color: var(--muted);
}

/* ===== Footer ===== */
.sheet__foot {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 10px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.btn {
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 0.14s ease, box-shadow 0.16s ease, background 0.16s ease, opacity 0.16s;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--ghost {
  background: var(--surface-2);
  border-color: var(--line-2);
  color: var(--text);
}

.btn--ghost:hover:not(:disabled) {
  background: var(--elevated);
  border-color: var(--neg);
  color: var(--neg);
}

.btn--primary {
  background: linear-gradient(120deg, var(--accent), #5a3df0);
  color: #fff;
  box-shadow: 0 10px 26px var(--accent-glow);
}

.btn--primary:hover:not(:disabled) {
  box-shadow: 0 14px 34px var(--accent-glow);
}

.btn--primary.is-danger {
  background: linear-gradient(120deg, var(--neg), #d6344f);
  box-shadow: 0 10px 26px rgba(255, 77, 109, 0.4);
}

.btn--full {
  grid-column: 1 / -1;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  z-index: 80;
  transform: translate(-50%, 18px);
  padding: 11px 18px;
  border-radius: var(--r-pill);
  background: var(--elevated);
  border: 1px solid var(--line-2);
  color: var(--text);
  font-size: 0.85rem;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.is-show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ===== Small screens ===== */
@media (max-width: 520px) {
  .sheet {
    padding: 10px 16px 18px;
  }
  .swap-visual {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .tokleg,
  .tokleg--to {
    justify-items: center;
    text-align: center;
  }
  .swap-visual__arrow {
    transform: rotate(90deg);
  }
  .data-grid {
    grid-template-columns: 1fr;
  }
  .sheet__foot {
    grid-template-columns: 1fr 1fr;
  }
}

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

(function () {
  "use strict";

  /* ---- Mock signing requests (fictional, UI only) ---- */
  var REQUESTS = {
    swap: {
      title: "Swap request",
      label: "You are about to swap",
      net: "Lumen Chain",
      from: { icon: "Ξ", cls: "tok--eth", amt: "1.5 ETH", fiat: "$4,218.00" },
      to: { icon: "$", cls: "tok--usdc", amt: "4,210 USDC", fiat: "$4,210.00" },
      arrow: "→",
      fromAddr: "0x4e9a…1b07",
      toAddr: "0x7a3f…c41d",
      fee: "0.00214 ETH · $6.02",
      total: "$4,224.02",
      confirmLabel: "Confirm",
      danger: false,
    },
    send: {
      title: "Send request",
      label: "You are about to send",
      net: "Nova Network",
      from: { icon: "◆", cls: "tok--nova", amt: "250 NOVA", fiat: "$1,062.50" },
      to: { icon: "↑", cls: "tok--usdc", amt: "0x7a3f…c41d", fiat: "Recipient" },
      arrow: "→",
      fromAddr: "0x4e9a…1b07",
      toAddr: "0x7a3f…c41d",
      fee: "0.0008 NOVA · $0.34",
      total: "250.0008 NOVA · $1,062.84",
      confirmLabel: "Confirm send",
      danger: false,
    },
    approve: {
      title: "Token approval",
      label: "You are granting spend access",
      net: "Lumen Chain",
      from: { icon: "$", cls: "tok--usdc", amt: "USDC", fiat: "Unlimited" },
      to: { icon: "◎", cls: "tok--nova", amt: "NovaSwap", fiat: "Spender" },
      arrow: "→",
      fromAddr: "0x4e9a…1b07",
      toAddr: "0x9d12…ab44",
      fee: "0.00061 ETH · $1.71",
      total: "$1.71",
      confirmLabel: "Approve anyway",
      danger: true,
      risk: {
        title: "Unlimited approval",
        text: "This contract can spend any amount of USDC until you revoke it.",
      },
    },
  };

  /* ---- Elements ---- */
  var overlay = document.getElementById("overlay");
  var sheet = document.getElementById("sheet");
  var toastEl = document.getElementById("toast");

  var stateReview = document.getElementById("stateReview");
  var stateSigning = document.getElementById("stateSigning");
  var stateSuccess = document.getElementById("stateSuccess");
  var sheetFoot = document.getElementById("sheetFoot");

  var confirmBtn = document.getElementById("confirmBtn");
  var rejectBtn = document.getElementById("rejectBtn");
  var closeBtn = document.getElementById("closeBtn");

  var detailsToggle = document.getElementById("detailsToggle");
  var detailsPanel = document.getElementById("detailsPanel");

  var lastFocus = null;
  var signTimer = null;

  /* ---- Toast helper ---- */
  var toastTimer = null;
  function toast(msg) {
    toastEl.textContent = msg;
    toastEl.classList.add("is-show");
    clearTimeout(toastTimer);
    toastTimer = setTimeout(function () {
      toastEl.classList.remove("is-show");
    }, 2200);
  }

  function setText(sel, value) {
    var el = sheet.querySelector(sel);
    if (el) el.textContent = value;
  }

  function randHash() {
    var hex = "0123456789abcdef";
    var s = "";
    for (var i = 0; i < 4; i++) s += hex[Math.floor(Math.random() * 16)];
    var e = "";
    for (var j = 0; j < 4; j++) e += hex[Math.floor(Math.random() * 16)];
    return "0x" + s + "…" + e;
  }

  /* ---- Populate sheet from a request ---- */
  function populate(req) {
    setText("[data-net]", req.net);
    setText("[data-net2]", req.net);
    setText("#sheetTitle", req.title);
    setText("#sheetSummary", req.label);

    var fromIcon = sheet.querySelector("[data-from-icon]");
    var toIcon = sheet.querySelector("[data-to-icon]");
    fromIcon.textContent = req.from.icon;
    fromIcon.className = "tok " + req.from.cls;
    toIcon.textContent = req.to.icon;
    toIcon.className = "tok " + req.to.cls;

    setText("[data-from-amt]", req.from.amt);
    setText("[data-from-fiat]", req.from.fiat);
    setText("[data-to-amt]", req.to.amt);
    setText("[data-to-fiat]", req.to.fiat);
    sheet.querySelector(".swap-visual__arrow").textContent = req.arrow;

    setText("[data-from-addr]", req.fromAddr);
    setText("[data-to-addr]", req.toAddr);
    setText("[data-fee]", req.fee);
    setText("[data-total]", req.total);

    var risk = document.getElementById("riskBanner");
    if (req.risk) {
      setText("[data-risk-title]", req.risk.title);
      setText("[data-risk-text]", req.risk.text);
      risk.hidden = false;
    } else {
      risk.hidden = true;
    }

    confirmBtn.textContent = req.confirmLabel;
    confirmBtn.classList.toggle("is-danger", !!req.danger);
  }

  /* ---- State machine ---- */
  function showState(name) {
    stateReview.hidden = name !== "review";
    stateSigning.hidden = name !== "signing";
    stateSuccess.hidden = name !== "success";

    if (name === "review") {
      sheetFoot.hidden = false;
      rejectBtn.textContent = "Reject";
      rejectBtn.classList.remove("btn--full");
      confirmBtn.style.display = "";
    } else if (name === "signing") {
      sheetFoot.hidden = true;
    } else if (name === "success") {
      sheetFoot.hidden = false;
      confirmBtn.style.display = "none";
      rejectBtn.textContent = "Done";
      rejectBtn.classList.add("btn--full");
    }
  }

  /* ---- Open / close ---- */
  function openSheet(key) {
    var req = REQUESTS[key];
    if (!req) return;
    lastFocus = document.activeElement;
    populate(req);
    collapseDetails();
    showState("review");

    overlay.hidden = false;
    /* force reflow so transition runs */
    void overlay.offsetWidth;
    overlay.classList.add("is-open");
    document.body.style.overflow = "hidden";
    document.addEventListener("keydown", onKeydown, true);
    setTimeout(function () {
      confirmBtn.focus();
    }, 60);
  }

  function closeSheet() {
    clearTimeout(signTimer);
    overlay.classList.remove("is-open");
    document.body.style.overflow = "";
    document.removeEventListener("keydown", onKeydown, true);
    setTimeout(function () {
      overlay.hidden = true;
    }, 260);
    if (lastFocus && lastFocus.focus) lastFocus.focus();
  }

  /* ---- Sign flow ---- */
  function confirmTx() {
    showState("signing");
    clearTimeout(signTimer);
    signTimer = setTimeout(function () {
      var h = randHash();
      setText("#txHash", h);
      showState("success");
      toast("Transaction submitted");
      setTimeout(function () {
        var done = document.getElementById("explorerLink");
        if (done) done.focus();
      }, 60);
    }, 1900);
  }

  function rejectTx() {
    if (!stateSuccess.hidden) {
      closeSheet();
      return;
    }
    toast("Request rejected");
    closeSheet();
  }

  /* ---- Details expander ---- */
  function collapseDetails() {
    detailsToggle.setAttribute("aria-expanded", "false");
    detailsPanel.hidden = true;
  }
  function toggleDetails() {
    var open = detailsToggle.getAttribute("aria-expanded") === "true";
    detailsToggle.setAttribute("aria-expanded", String(!open));
    detailsPanel.hidden = open;
  }

  /* ---- Focus trap + Esc ---- */
  function focusables() {
    return Array.prototype.filter.call(
      sheet.querySelectorAll(
        'button:not([disabled]):not([style*="display: none"]), a[href], [tabindex]:not([tabindex="-1"])'
      ),
      function (el) {
        return el.offsetParent !== null;
      }
    );
  }

  function onKeydown(e) {
    if (e.key === "Escape") {
      e.preventDefault();
      rejectTx();
      return;
    }
    if (e.key === "Tab") {
      var items = focusables();
      if (!items.length) return;
      var first = items[0];
      var last = items[items.length - 1];
      if (e.shiftKey && document.activeElement === first) {
        e.preventDefault();
        last.focus();
      } else if (!e.shiftKey && document.activeElement === last) {
        e.preventDefault();
        first.focus();
      }
    }
  }

  /* ---- Copy calldata ---- */
  function copyCalldata() {
    var pre = document.getElementById("calldata");
    var text = pre ? pre.textContent.replace(/\s+/g, "") : "";
    var done = function () {
      toast("Calldata copied");
    };
    if (navigator.clipboard && navigator.clipboard.writeText) {
      navigator.clipboard.writeText(text).then(done, done);
    } else {
      done();
    }
  }

  /* ---- Wire events ---- */
  Array.prototype.forEach.call(document.querySelectorAll("[data-open]"), function (btn) {
    btn.addEventListener("click", function () {
      openSheet(btn.getAttribute("data-open"));
    });
  });

  confirmBtn.addEventListener("click", confirmTx);
  rejectBtn.addEventListener("click", rejectTx);
  closeBtn.addEventListener("click", function () {
    rejectTx();
  });
  detailsToggle.addEventListener("click", toggleDetails);
  document.getElementById("copyData").addEventListener("click", copyCalldata);

  overlay.addEventListener("click", function (e) {
    if (e.target === overlay) rejectTx();
  });

  var explorer = document.getElementById("explorerLink");
  explorer.addEventListener("click", function (e) {
    e.preventDefault();
    toast("Opening block explorer (demo)");
  });
})();

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Web3 — Transaction Confirm / Signing Sheet</title>
  <link rel="preconnect" href="https://fonts.googleapis.com" />
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
  <link
    href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Space+Grotesk:wght@400;500;600;700&display=swap"
    rel="stylesheet"
  />
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <main class="page">
    <div class="page__hero">
      <span class="brand">
        <span class="brand__dot" aria-hidden="true"></span>
        Lumen Wallet
      </span>
      <h1>Transaction Confirm</h1>
      <p>A wallet-style signing request sheet. Tap a request below to review and sign.</p>

      <div class="actions">
        <button class="launch launch--swap" type="button" data-open="swap">
          <span class="launch__icon" aria-hidden="true">⇄</span>
          <span class="launch__body">
            <strong>Swap request</strong>
            <small>1.5 ETH → 4,210 USDC</small>
          </span>
        </button>
        <button class="launch launch--send" type="button" data-open="send">
          <span class="launch__icon" aria-hidden="true">↑</span>
          <span class="launch__body">
            <strong>Send request</strong>
            <small>250 NOVA → 0x7a3f…c41d</small>
          </span>
        </button>
        <button class="launch launch--approve" type="button" data-open="approve">
          <span class="launch__icon" aria-hidden="true">!</span>
          <span class="launch__body">
            <strong>Token approval</strong>
            <small>Unlimited USDC spend · flagged</small>
          </span>
        </button>
      </div>
    </div>
  </main>

  <!-- ====== Signing sheet ====== -->
  <div class="overlay" id="overlay" hidden>
    <div
      class="sheet"
      id="sheet"
      role="dialog"
      aria-modal="true"
      aria-labelledby="sheetTitle"
      aria-describedby="sheetSummary"
    >
      <div class="sheet__grab" aria-hidden="true"></div>

      <header class="sheet__head">
        <div class="origin">
          <span class="origin__avatar" aria-hidden="true">◎</span>
          <div class="origin__meta">
            <strong id="sheetTitle">Signature request</strong>
            <span class="origin__url">app.novaswap.fi</span>
          </div>
          <span class="badge badge--net" id="netBadge">
            <span class="badge__dot" aria-hidden="true"></span>
            <span data-net>Lumen Chain</span>
          </span>
        </div>
        <button class="iconbtn" id="closeBtn" type="button" aria-label="Close request">✕</button>
      </header>

      <!-- DEFAULT (review) state -->
      <section class="state" id="stateReview" data-state="review">
        <div class="hero-card" id="heroCard">
          <p class="hero-card__label" id="sheetSummary">You are about to</p>
          <div class="swap-visual" data-action-visual>
            <div class="tokleg tokleg--from">
              <span class="tok tok--eth" data-from-icon aria-hidden="true">Ξ</span>
              <span class="tokleg__amt mono" data-from-amt>1.5 ETH</span>
              <span class="tokleg__sub mono" data-from-fiat>$4,218.00</span>
            </div>
            <span class="swap-visual__arrow" aria-hidden="true">→</span>
            <div class="tokleg tokleg--to">
              <span class="tok tok--usdc" data-to-icon aria-hidden="true">$</span>
              <span class="tokleg__amt mono" data-to-amt>4,210 USDC</span>
              <span class="tokleg__sub mono" data-to-fiat>$4,210.00</span>
            </div>
          </div>
        </div>

        <!-- risk banner (toggled per request) -->
        <div class="risk" id="riskBanner" hidden>
          <span class="risk__icon" aria-hidden="true">⚠</span>
          <div class="risk__body">
            <strong data-risk-title>Unlimited approval</strong>
            <span data-risk-text>This contract can spend any amount of USDC until revoked.</span>
          </div>
        </div>

        <ul class="rows" role="list">
          <li class="row">
            <span class="row__k">From</span>
            <span class="row__v mono" data-from-addr>0x4e9a…1b07</span>
          </li>
          <li class="row">
            <span class="row__k">Interacting with</span>
            <span class="row__v mono" data-to-addr>0x7a3f…c41d</span>
          </li>
          <li class="row">
            <span class="row__k">Network fee</span>
            <span class="row__v mono" data-fee>0.00214 ETH · $6.02</span>
          </li>
          <li class="row row--total">
            <span class="row__k">Estimated total</span>
            <span class="row__v mono" data-total>$4,224.02</span>
          </li>
        </ul>

        <!-- details expander -->
        <div class="details">
          <button
            class="details__toggle"
            id="detailsToggle"
            type="button"
            aria-expanded="false"
            aria-controls="detailsPanel"
          >
            <span>Advanced details &amp; raw data</span>
            <span class="details__chev" aria-hidden="true">⌄</span>
          </button>
          <div class="details__panel" id="detailsPanel" hidden>
            <dl class="data-grid">
              <div><dt>Nonce</dt><dd class="mono">142</dd></div>
              <div><dt>Gas limit</dt><dd class="mono">210,000</dd></div>
              <div><dt>Max fee</dt><dd class="mono">18.4 gwei</dd></div>
              <div><dt>Priority</dt><dd class="mono">1.5 gwei</dd></div>
            </dl>
            <p class="data-grid__label">Calldata</p>
            <pre class="calldata mono" id="calldata">0x38ed1739000000000000000000000000000000000000000000000000014d1120d7b16000
0000000000000000000000000000000000000000000000000000000fa3e5a6a0
0000000000000000000000000000000000000000000000000000000000000080
0000000000000000000000004e9a3c0f8d2b71a5e6c9f10d3a82b41c7e0f51b07</pre>
            <button class="copybtn" type="button" id="copyData" data-copy="calldata">Copy calldata</button>
          </div>
        </div>
      </section>

      <!-- SIGNING state -->
      <section class="state state--center" id="stateSigning" data-state="signing" hidden>
        <div class="spinner" aria-hidden="true"></div>
        <strong>Awaiting signature…</strong>
        <span class="muted">Broadcasting to <span data-net2>Lumen Chain</span></span>
      </section>

      <!-- SUCCESS state -->
      <section class="state state--center" id="stateSuccess" data-state="success" hidden>
        <div class="check" aria-hidden="true">
          <svg viewBox="0 0 52 52"><path d="M14 27 l8 8 l16 -18" /></svg>
        </div>
        <strong>Transaction submitted</strong>
        <span class="muted">It may take a moment to confirm on-chain.</span>
        <a class="hash" id="explorerLink" href="#" data-noop>
          <span class="mono" id="txHash">0x9c41…7e02</span>
          <span class="hash__ext" aria-hidden="true">↗</span>
        </a>
      </section>

      <!-- footer / actions -->
      <footer class="sheet__foot" id="sheetFoot">
        <button class="btn btn--ghost" id="rejectBtn" type="button">Reject</button>
        <button class="btn btn--primary" id="confirmBtn" type="button">Confirm</button>
      </footer>
    </div>
  </div>

  <div class="toast" id="toast" role="status" aria-live="polite"></div>

  <script src="script.js"></script>
</body>
</html>

Transaction Confirm / Signing Sheet

A wallet-popup style confirmation sheet for signing on-chain transactions. It mimics the moment a dApp asks your wallet to sign: the request slides up from the bottom (centering as a modal on wider screens) with the requesting origin, a network badge, and a gradient-bordered hero card that states exactly what you are about to do — for example Swap 1.5 ETH → 4,210 USDC. All addresses, amounts, hashes and gas values use a monospace font and truncated 0x1234…ab9f formatting for trust and legibility.

Three sample requests are wired up: a swap, a send, and a flagged token approval that surfaces a red risk banner (“unlimited approval”). Each populates the same sheet with its own tokens, fee line, and estimated total. An Advanced details expander reveals the nonce, gas limit, max/priority fee, and the raw calldata in a scrollable code block with a copy button.

Pressing Confirm moves through a signing spinner into an animated success state showing a freshly generated mock tx hash and a block-explorer link; Reject, the close button, the Esc key, and clicking the dimmed overlay all dismiss the request. The dialog uses role="dialog" with aria-modal, a focus trap, restored focus on close, focus-visible rings, and a prefers-reduced-motion fallback.

UI-only simulation — no real wallet, RPC, or on-chain calls. Mock data, fictional tokens.