/* big fonts, big tap targets, high contrast for elderly users.
   risk colours: neutral blue-grey (low), amber (caution), red (danger) */

:root {
  --bg: #eef2f6;
  --surface: #ffffff;
  --ink: #1f2933;
  --ink-soft: #52606d;
  --primary: #1f6feb;
  --primary-dark: #1a5fd0;
  --line: #dfe6ee;
  --radius: 16px;
  --shadow: 0 2px 4px rgba(20, 40, 70, 0.04), 0 8px 24px rgba(20, 40, 70, 0.08);
  --shadow-sm: 0 1px 2px rgba(20, 40, 70, 0.06);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    system-ui, sans-serif;
  font-size: 20px;
  line-height: 1.7;
  color: var(--ink);
  background: linear-gradient(180deg, #f3f7fb 0%, var(--bg) 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* header */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 22px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 25px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand::before {
  content: "🛡️";
  font-size: 24px;
}

nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

nav a {
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

nav a:hover {
  background: #eaf1fb;
  color: var(--primary);
}

nav a.lang {
  border: 1px solid var(--line);
  color: var(--primary);
}

/* main */
main {
  max-width: 660px;
  margin: 0 auto;
  padding: 32px 20px 56px;
  animation: rise 0.3s ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 6px 0 14px;
}

h2 {
  font-size: 23px;
  font-weight: 600;
  margin: 30px 0 12px;
}

.lead {
  font-size: 21px;
  color: var(--ink-soft);
  margin-top: 0;
}

/* group content into soft cards */
section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px 22px;
  margin: 18px 0;
}

section h2 {
  margin-top: 0;
}

/* safety box */
.safety {
  margin: 20px 0;
  padding: 16px 18px;
  font-size: 19px;
  background: #fff5f4;
  border: 1px solid #f3c9c4;
  border-left: 6px solid #d64a3b;
  border-radius: var(--radius);
  color: #8a2a1f;
  box-shadow: var(--shadow-sm);
}

.trust {
  margin: 18px 0 6px;
  font-size: 18px;
  color: var(--ink-soft);
}

/* form */
form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-top: 8px;
}

label {
  display: block;
  font-weight: 600;
  margin: 16px 0 8px;
}

form label:first-child {
  margin-top: 0;
}

textarea,
select {
  width: 100%;
  font-size: 20px;
  font-family: inherit;
  color: var(--ink);
  padding: 14px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: #fbfdff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(31, 111, 235, 0.15);
}

textarea[readonly] {
  background: #f1f5f9;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2352606d' stroke-width='2.5'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

.big-button {
  display: block;
  width: 100%;
  margin-top: 22px;
  padding: 17px;
  font-size: 22px;
  font-weight: 700;
  font-family: inherit;
  color: #fff;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: 14px;
  box-shadow: 0 6px 16px rgba(31, 111, 235, 0.28);
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.12s, filter 0.12s;
}

.big-button:hover {
  filter: brightness(1.05);
  box-shadow: 0 8px 22px rgba(31, 111, 235, 0.34);
}

.big-button:active {
  transform: translateY(1px);
  box-shadow: 0 4px 12px rgba(31, 111, 235, 0.28);
}

/* examples */
.examples {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}

.example-chip {
  display: inline-block;
  margin: 6px 8px 6px 0;
  padding: 10px 18px;
  font-size: 18px;
  font-family: inherit;
  font-weight: 500;
  color: var(--primary);
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s, transform 0.12s, background 0.15s;
}

.example-chip:hover {
  border-color: var(--primary);
  background: #f4f8ff;
  transform: translateY(-1px);
}

/* risk card */
.risk-card {
  position: relative;
  border-radius: var(--radius);
  padding: 26px 24px 24px;
  margin-bottom: 4px;
  color: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.risk-card::before {
  font-size: 30px;
  line-height: 1;
  display: block;
  margin-bottom: 8px;
}

.risk-card.ok {
  background: linear-gradient(135deg, #6b8194 0%, #54697b 100%);
}
.risk-card.ok::before {
  content: "ℹ️";
}

.risk-card.caution {
  background: linear-gradient(135deg, #e8a13a 0%, #d4880f 100%);
}
.risk-card.caution::before {
  content: "⚠️";
}

.risk-card.danger {
  background: linear-gradient(135deg, #d9513f 0%, #b5301f 100%);
}
.risk-card.danger::before {
  content: "⛔";
}

.risk-label {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  opacity: 0.92;
}

.risk-text {
  margin: 4px 0 12px;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.summary {
  margin: 0;
  font-size: 21px;
}

/* lists */
.reasons {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.reasons li {
  font-size: 18px;
  font-weight: 500;
  padding: 7px 14px;
  background: #fdeceb;
  color: #9a2c1f;
  border-radius: 999px;
}

.advice {
  margin: 0;
  padding-left: 24px;
}

.advice li {
  font-size: 21px;
  font-weight: 600;
  margin: 8px 0;
}

.quote {
  background: #f5f8fc;
  border-left: 4px solid var(--primary);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 20px;
  margin: 0;
  white-space: pre-line;
}

/* actions */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.link-button {
  flex: 1;
  min-width: 140px;
  text-align: center;
  padding: 14px;
  font-size: 18px;
  font-weight: 600;
  font-family: inherit;
  color: var(--primary);
  background: var(--surface);
  border: 2px solid var(--primary);
  border-radius: 12px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, transform 0.12s;
}

.link-button:hover {
  background: #eef4ff;
  transform: translateY(-1px);
}

.feedback {
  display: flex;
  gap: 12px;
}

/* call / share */
.family-set {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.weixin-shown {
  font-size: 19px;
  color: var(--ink);
}

.weixin-shown .wxid {
  color: var(--primary);
}

.family-save label {
  margin-top: 4px;
}

.family-save input {
  width: 100%;
  font-size: 20px;
  font-family: inherit;
  padding: 14px;
  border: 2px solid var(--line);
  border-radius: 12px;
  background: #fbfdff;
  margin-bottom: 12px;
}

.family-save input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(31, 111, 235, 0.15);
}

/* the bank/emergency call buttons read as actions, not danger — green tint */
.call-bank {
  color: #1f7a3d;
  border-color: #1f7a3d;
}

.call-bank:hover {
  background: #eaf7ee;
}

.call-note {
  margin: 14px 0 0;
  font-size: 17px;
  color: var(--ink-soft);
}

/* history */
.history {
  list-style: none;
  padding: 0;
}

.history li a {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 18px 20px;
  margin-bottom: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.12s, box-shadow 0.15s;
}

.history li a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.history .when {
  color: var(--ink-soft);
  font-size: 17px;
}

.history .src {
  flex: 1;
  font-weight: 600;
}

.badge {
  padding: 6px 14px;
  border-radius: 999px;
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}

.badge.ok {
  background: #607d8b;
}
.badge.caution {
  background: #d4880f;
}
.badge.danger {
  background: #b5301f;
}

/* footer */
footer {
  max-width: 660px;
  margin: 0 auto;
  padding: 24px 20px 36px;
  color: #8595a4;
  font-size: 15px;
  text-align: center;
}

/* AI analysis block */
.ai-block {
  background: #f0f4ff;
  border: 1px solid #c7d7f5;
  border-radius: var(--radius);
  padding: 20px 24px;
}

.ai-block h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 0;
}

.ai-disclaimer {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 10px 0 0;
  font-style: italic;
}

.ai-badge {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 6px;
  vertical-align: middle;
}

/* emergency action block */
.emergency-block {
  background: #fff3f3;
  border: 2px solid #e53e3e;
  border-radius: var(--radius);
  padding: 20px 24px;
}

.emergency-block h2 {
  color: #c53030;
  margin-top: 0;
}

.emergency-btn {
  display: block;
  width: 100%;
  padding: 18px 24px;
  background: #e53e3e;
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  border-radius: 12px;
  margin-bottom: 14px;
  transition: background 0.15s;
}

.emergency-btn:hover {
  background: #c53030;
}

/* URL fetch */
.url-error {
  background: #fff3cd;
  border: 1px solid #f0c36d;
  border-radius: 10px;
  padding: 12px 18px;
  color: #7a4f00;
  font-size: 17px;
}

.fetched-label {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.fetched-label em {
  font-style: normal;
  font-weight: 600;
  color: var(--ink);
}

/* small screens */
@media (max-width: 480px) {
  body {
    font-size: 19px;
  }
  h1 {
    font-size: 29px;
  }
  main {
    padding: 22px 16px 44px;
  }
  .risk-text {
    font-size: 28px;
  }
}