:root {
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --text: #24312c;
  --text-muted: #66756f;
  --brand: #2f7a63;
  --brand-dark: #23604d;
  --border: #dde4e1;
  --danger: #b8483b;
  --danger-bg: #fbeceb;
  --hint-bg: #f0f6f3;
  --radius: 16px;
  --shadow: 0 8px 24px rgba(36, 49, 44, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px 48px;
}

.topbar {
  width: 100%;
  max-width: 480px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--brand-dark);
}

.tagline {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

.lang-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
}

.lang-toggle:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.hero {
  width: 100%;
  max-width: 480px;
  text-align: center;
  margin-bottom: 32px;
}

.hero-headline {
  font-size: 26px;
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--brand-dark);
}

.hero-sub {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0 0 18px;
}

.hero-features {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.hero-features li {
  background: var(--hint-bg);
  color: var(--brand-dark);
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
}

.hero-cta {
  max-width: 320px;
  margin-left: auto;
  margin-right: auto;
}

.hero-steps {
  margin-top: 28px;
  text-align: left;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
}

.hero-steps-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}

.hero-steps ol {
  margin: 0;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-steps li {
  font-size: 14.5px;
  line-height: 1.5;
}

.card {
  width: 100%;
  max-width: 480px;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
}

.card h1 {
  font-size: 20px;
  margin: 0 0 20px;
}

label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  margin-top: 18px;
}

label:first-of-type {
  margin-top: 0;
}

input[type="text"],
input[type="password"],
input[type="url"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 15px;
  background: #fbfcfb;
  color: var(--text);
}

input:focus {
  outline: none;
  border-color: var(--brand);
  background: #fff;
}

.disclaimer {
  margin-top: 20px;
  font-size: 12.5px;
  color: var(--text-muted);
  background: var(--hint-bg);
  border-radius: 10px;
  padding: 12px 14px;
  line-height: 1.5;
}

.primary {
  display: block;
  width: 100%;
  margin-top: 22px;
  padding: 13px;
  border: none;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  box-sizing: border-box;
}

.primary:hover {
  background: var(--brand-dark);
}

button.primary:disabled {
  opacity: 0.6;
  cursor: default;
}

button.secondary {
  width: 100%;
  margin-top: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
}

.error-text {
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13.5px;
  margin-top: 14px;
  display: none;
}

.error-text.visible {
  display: block;
}

.hint-box {
  background: var(--hint-bg);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13.5px;
  color: var(--text);
  margin-bottom: 18px;
}

.result-box {
  margin-top: 4px;
}

.short-link-display {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--hint-bg);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  word-break: break-all;
}

.status-text {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 8px;
}

.hidden {
  display: none !important;
}