:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #f8faff;
  --text: #101828;
  --muted: #667085;
  --border: #d7e0ee;
  --primary: #0066ff;
  --danger-bg: #fff1f1;
  --danger-border: #ffc9c9;
  --danger-text: #b42318;
  --success-bg: #effcf3;
  --success-border: #b7ebc6;
  --success-text: #067647;
  --shadow: 0 24px 64px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #fbfdff 0%, #f3f6fb 100%);
  color: var(--text);
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  padding: 24px 0 12px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid rgba(215, 224, 238, 0.9);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  border-radius: 24px;
  box-shadow: 0 18px 48px rgba(16, 24, 40, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(180deg, #1672ff 0%, #0059e6 100%);
  color: #fff;
  display: grid;
  place-items: center;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-copy small {
  color: var(--muted);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-link,
.nav-button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 15px;
  transition: 0.2s ease;
}

.nav-link {
  color: var(--text);
  background: transparent;
}

.nav-link:hover {
  text-decoration: none;
  background: var(--surface-soft);
}

.nav-link.is-primary,
.button.is-primary {
  background: linear-gradient(180deg, #1672ff 0%, #0059e6 100%);
  color: #fff;
  border-color: #0059e6;
}

.nav-button,
.button {
  cursor: pointer;
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}

.button.is-secondary {
  background: var(--surface-soft);
}

.button.is-danger {
  color: var(--danger-text);
}

.hero {
  padding: 28px 0 56px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(290px, 360px);
  gap: 22px;
  align-items: start;
}

.card {
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(215, 224, 238, 0.92);
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.main-card {
  padding: 32px;
}

.aside-card,
.content-card,
.center-card {
  padding: 26px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: #e9f1ff;
  color: #004ac2;
  font-size: 14px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: -0.04em;
}

h1 {
  margin-top: 18px;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 0.98;
}

.lead {
  margin: 18px 0 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.notice {
  margin: 26px 0 22px;
  display: flex;
  gap: 12px;
  padding: 18px 20px;
  border-radius: 20px;
  background: #fff8ea;
  border: 1px solid #ffe1a8;
  color: #774f00;
}

.form-grid {
  display: grid;
  gap: 18px;
}

.field label {
  display: block;
  margin-bottom: 10px;
  font-size: 15px;
  font-weight: 600;
}

.field input {
  width: 100%;
  min-height: 58px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 16px;
  color: var(--text);
}

.field input:focus {
  outline: none;
  border-color: rgba(0, 102, 255, 0.5);
  box-shadow: 0 0 0 4px rgba(0, 102, 255, 0.1);
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  cursor: pointer;
}

.checkbox-input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--primary);
  flex: 0 0 auto;
}

.checkbox-note {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.actions,
.list,
.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.stack {
  flex-direction: column;
}

.stack-item,
.list-item,
.empty-state,
.footer-card {
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
}

.stack-item,
.list-item,
.empty-state {
  padding: 18px;
}

.message {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  font-size: 15px;
  line-height: 1.5;
}

.message.error {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}

.message.success {
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.list {
  display: grid;
  margin-top: 20px;
}

.list-item {
  display: grid;
  gap: 8px;
}

.list-item-meta,
.content-card p,
.content-card li,
.footer-card,
.empty-state {
  color: var(--muted);
  line-height: 1.65;
}

.dialog {
  width: min(640px, calc(100% - 32px));
  border: 0;
  padding: 0;
  border-radius: 28px;
  box-shadow: 0 32px 72px rgba(16, 24, 40, 0.28);
}

.dialog::backdrop {
  background: rgba(8, 15, 30, 0.45);
  backdrop-filter: blur(6px);
}

.dialog-card {
  padding: 28px;
  background: #fff;
}

.center-card {
  width: min(560px, calc(100% - 32px));
  margin: 32px auto 56px;
}

.footer {
  padding: 0 0 32px;
}

.footer-card {
  padding: 20px 24px;
  background: rgba(255, 255, 255, 0.76);
}

.result-link {
  display: inline-flex;
  margin-top: 10px;
  font-weight: 700;
}

.copy-row {
  margin-top: 10px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.copy-button {
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(0, 102, 255, 0.2);
  border-radius: 12px;
  background: #fff;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: 0.2s ease;
}

.copy-button:hover {
  background: #eef4ff;
}

.copy-button.is-copied {
  background: #dff7e8;
  border-color: #8fd3a9;
  color: #067647;
}

.copy-button svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100%, calc(100% - 20px));
  }

  .main-card,
  .aside-card,
  .content-card,
  .center-card {
    padding: 22px;
    border-radius: 24px;
  }

  .actions {
    flex-direction: column;
  }

  .button,
  .nav-button,
  .nav-link {
    width: 100%;
  }

  .nav-links {
    width: 100%;
  }
}