*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #ff5e3b;
  --primary-hover: #ff815e;
  --primary-light: #fff5f0;
  --text-primary: #222222;
  --text-secondary: #666666;
  --text-muted: #888888;
  --border: #d9d9d9;
  --bg-page: #f5f5f5;
  --bg-white: #ffffff;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --radius: 8px;
  --transition: 0.2s ease;
  --font-xs: 12px;
  --font-sm: 13px;
  --font-md: 14px;
  --font-base: 16px;
  --font-lg: 18px;
  --font-xl: 20px;
}

html {
  font-size: 16px;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: var(--font-base);
  background: var(--bg-page);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  color: var(--primary-hover);
}

.header-nav-tip {
  color: var(--text-muted);
  font-size: var(--font-md);
  font-weight: 400;
}

.header .header-nav {
  gap: 8px;
  align-items: center;
}

.header-nav a.header-nav-link {
  color: var(--primary);
  font-size: var(--font-md);
  font-weight: 500;
}

.header-nav a.header-nav-link:hover {
  color: var(--primary-hover);
}

/* Main */
.account-main {
  flex: 1;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 24px 48px;
}

.signup-card {
  width: 100%;
  max-width: 520px;
  background: var(--bg-white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 36px 40px 32px;
}

.signup-step {
  display: none;
}

.signup-step--active,
.signup-step.active {
  display: block;
}

.signup-head {
  text-align: center;
  margin-bottom: 28px;
}

.signup-title {
  font-size: var(--font-xl);
  font-weight: 600;
  margin-bottom: 10px;
}

.signup-desc {
  font-size: var(--font-md);
  color: var(--text-secondary);
  line-height: 1.6;
}

.signup-desc strong {
  color: var(--text-primary);
  font-weight: 500;
}

/* Progress（仅展示，不可点击跳步） */
.signup-progress {
  display: flex;
  justify-content: center;
  gap: 8px;
  list-style: none;
  margin-bottom: 32px;
  padding: 0;
  user-select: none;
  pointer-events: none;
}

.signup-progress-item {
  padding: 0 12px;
  position: relative;
}

.signup-progress-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -8px;
  top: 50%;
  width: 16px;
  height: 1px;
  background: var(--border);
}

.signup-progress-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-sm);
  color: var(--text-muted);
}

.signup-progress-label em {
  font-style: normal;
}

.signup-progress-num {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  font-size: var(--font-xs);
  flex-shrink: 0;
}

.signup-progress-item.active .signup-progress-label {
  color: var(--primary);
  font-weight: 500;
}

.signup-progress-item.active .signup-progress-num {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.signup-progress-item.done .signup-progress-label {
  color: var(--text-secondary);
}

.signup-progress-item.done .signup-progress-num {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.signup-progress-item.is-hidden {
  display: none;
}

.signup-sms-tip {
  margin-top: 8px;
}

.signup-sms-tip strong {
  color: var(--primary);
  font-weight: 600;
}

.signup-username-tip {
  margin: 4px 0 12px;
  font-size: var(--font-md);
  color: var(--text-secondary);
}

.signup-username-tip strong {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.signup-redirect-tip {
  margin: 8px 0 20px;
  font-size: var(--font-md);
  color: var(--text-muted);
}

.signup-redirect-tip #redirect-countdown {
  color: var(--primary);
  font-weight: 600;
}

/* Form */
.signup-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: var(--font-md);
  font-weight: 500;
  color: var(--text-primary);
}

.form-label em {
  color: var(--primary);
  font-style: normal;
}

.form-input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--font-base);
  font-family: inherit;
  color: var(--text-primary);
  background: var(--bg-white);
  outline: none;
  transition: border-color var(--transition);
}

.form-input:focus {
  border-color: var(--primary);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input-group {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.form-input-group:focus-within {
  border-color: var(--primary);
}

.form-prefix {
  flex-shrink: 0;
  padding: 0 14px;
  height: 44px;
  display: flex;
  align-items: center;
  background: var(--bg-page);
  border-right: 1px solid var(--border);
  font-size: var(--font-base);
  color: var(--text-secondary);
}

.form-input--group {
  border: none;
  border-radius: 0;
}

.form-input-pwd {
  position: relative;
}

.form-input-pwd .form-input {
  padding-right: 44px;
}

.btn-toggle-pwd {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
}

.btn-toggle-pwd .icon-eye-off {
  display: none;
}

.btn-toggle-pwd.is-revealed .icon-eye {
  display: none;
}

.btn-toggle-pwd.is-revealed .icon-eye-off {
  display: block;
}

.btn-toggle-pwd:hover {
  color: var(--text-secondary);
  background: var(--bg-page);
}

.form-hint {
  font-size: var(--font-xs);
  color: var(--text-muted);
  line-height: 1.4;
}

.form-captcha {
  display: flex;
  gap: 12px;
}

.form-captcha .form-input {
  flex: 1;
}

.captcha-box {
  flex-shrink: 0;
  width: 108px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, #eef2ff 0%, #e8f5e9 100%);
  cursor: pointer;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 4px;
  color: #3949ab;
  font-family: 'Courier New', monospace;
  transition: border-color var(--transition);
}

.captcha-box:hover {
  border-color: var(--primary);
}

.form-code-row {
  display: flex;
  gap: 12px;
}

.form-code-row .form-input {
  flex: 1;
}

.btn-code {
  flex-shrink: 0;
  padding: 0 16px;
  height: 44px;
  background: none;
  border: 1px solid var(--primary);
  color: var(--primary);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: var(--font-md);
  font-family: inherit;
  white-space: nowrap;
  transition: all var(--transition);
}

.btn-code:hover:not(:disabled) {
  background: var(--primary-light);
}

.btn-code:disabled {
  border-color: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
}

.form-agree {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: var(--font-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  cursor: pointer;
}

.form-agree input {
  flex-shrink: 0;
  margin-top: 3px;
  accent-color: var(--primary);
}

.form-resend-tip {
  text-align: center;
  font-size: var(--font-sm);
  color: var(--text-muted);
  margin-top: -4px;
}

.btn-submit {
  width: 100%;
  height: 44px;
  margin-top: 4px;
  border: none;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-size: var(--font-base);
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-submit:hover {
  background: var(--primary-hover);
}

.btn-submit:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.btn-submit--link {
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: #fff;
}

/* Success */
.signup-success {
  text-align: center;
  padding: 20px 0 8px;
}

.signup-success-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #e8f5e9;
  color: #2e7d32;
  font-size: 32px;
  font-weight: 700;
}

.signup-back-home {
  display: inline-block;
  margin-top: 16px;
  font-size: var(--font-md);
  color: var(--text-muted);
}

.signup-back-home:hover {
  color: var(--primary);
}

/* Footer */
.account-footer {
  flex-shrink: 0;
  padding: 20px 24px;
  text-align: center;
  font-size: var(--font-xs);
  color: var(--text-muted);
}

.account-footer a {
  color: var(--text-muted);
}

.account-footer a:hover {
  color: var(--primary);
}

@media (max-width: 768px) {
  .header-nav {
    display: flex;
    gap: 12px;
  }
}

@media (max-width: 576px) {
  .header-nav-tip {
    font-size: var(--font-sm);
  }

  .signup-card {
    padding: 28px 20px 24px;
  }

  .signup-progress {
    flex-wrap: wrap;
    gap: 12px;
  }

  .signup-progress-item:not(:last-child)::after {
    display: none;
  }

  .form-captcha {
    flex-direction: column;
  }

  .captcha-box {
    width: 100%;
  }
}