:root {
      --page-bg: #f5f7fb;
      --card-bg: #ffffff;
      --card-border: rgba(148, 163, 184, 0.24);
      --text-primary: #141821;
      --text-secondary: #5f6777;
      --accent-start: #5b6cff;
      --accent-end: #4f78ff;
      --accent-contrast: #ffffff;
      --input-bg: #ffffff;
      --input-border: #d7dce5;
      --input-focus: #5b6cff;
      --divider: #d7dce5;
      --error-bg: #fff0f1;
      --error-border: #f2c7cc;
      --error-text: #c33d4a;
      --shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
    }

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

    html,
    body {
      min-height: 100dvh;
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
      background: var(--page-bg);
      color: var(--text-primary);
    }

    body {
      margin: 0;
    }

    .page-shell {
      min-height: 100dvh;
      width: 100%;
      display: flex;
      justify-content: center;
      align-items: stretch;
    }

    .login-container {
      width: 100%;
      min-height: 100dvh;
      min-height: 100svh;
      background: var(--card-bg);
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      /*overflow-y: auto;*/
      padding: 20px 30px 0;
    }

    .login-content {
      width: 100%;
      max-width: 400px;
      margin: 0 auto;
    }

    .login-content--fill {
      flex: 1 1 auto;
      min-height: 0;
    }

    .login-footer {
      flex: 0 0 auto;
      width: 100%;
      max-width: 400px;
      margin: 0 auto;
      padding-top: 14px;
      padding-bottom: max(48px, calc(env(safe-area-inset-bottom, 0px) + 24px));
    }

    .login-footer .login-button {
      margin-top: 0;
    }

    .login-footer .register-link {
      margin-top: 14px;
      margin-bottom: 0;
      text-align: center;
    }

    .brand-header {
      display: flex;
      align-items: center;
      justify-content: flex-start;
      gap: 14px;
      margin-bottom: 22px;
    }

    .logo {
      margin-bottom: 0;
      flex-shrink: 0;
    }

    .logo img {
      width: 96px;
      height: auto;
      border-radius: 18px;
      display: inline-block;
    }

    .brand-copy {
      min-width: 0;
      flex: 1;
    }

    .brand-top {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 4px;
      margin-bottom: 8px;
    }

    h1 {
      color: var(--text-primary);
      margin-bottom: 0;
      font-size: 1.62rem;
      line-height: 1.15;
      text-align: left;
    }

    .subtitle {
      color: var(--text-secondary);
      margin-bottom: 0;
      font-size: 0.95rem;
      text-align: left;
      white-space: nowrap;
    }

    .service-target {
      margin: 0 0 2px 0;
      line-height: 1.4;
    }

    .eyebrow-label {
      display: block;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.02em;
      text-transform: none;
      color: var(--text-secondary);
      margin-bottom: 4px;
    }

    .account-eyebrow {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-primary);
      margin: 4px 0 0 0;
    }

    .service-badge {
      display: inline-block;
      background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
      color: var(--accent-contrast);
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      flex-shrink: 0;
    }

    .form-group {
      margin-bottom: 18px;
    }

    label {
      display: block;
      margin-bottom: 8px;
      color: var(--text-primary);
      font-weight: 600;
      font-size: 0.9rem;
    }

    input {
      width: 100%;
      padding: 14px 15px;
      border: 1px solid var(--input-border);
      border-radius: 12px;
      font-size: 1rem;
      background: var(--input-bg);
      color: var(--text-primary);
      transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
    }

    input::placeholder {
      color: #8a93a5;
    }

    input:focus {
      outline: none;
      border-color: var(--input-focus);
      box-shadow: 0 0 0 4px rgba(91, 108, 255, 0.14);
    }

    .error-message {
      background-color: var(--error-bg);
      border: 1px solid var(--error-border);
      color: var(--error-text);
      font-size: 0.85rem;
      line-height: 1.5;
      padding: 13px 14px;
      border-radius: 12px;
      margin-bottom: 18px;
      display: none;
    }

    .error-message.show {
      display: block;
    }

    .login-button {
      width: 100%;
      min-height: 52px;
      padding: 14px 16px;
      background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
      color: var(--accent-contrast);
      border: none;
      border-radius: 14px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
      margin-top: 10px;
      box-shadow: 0 12px 24px rgba(91, 108, 255, 0.18);
    }

    .login-button:hover {
      transform: translateY(-2px);
      box-shadow: 0 16px 28px rgba(91, 108, 255, 0.22);
    }

    .login-button:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
      box-shadow: none;
    }

    a.login-button {
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-sizing: border-box;
    }

    .divider[hidden],
    .provider-login-email-form[hidden],
    .account-confirm-email-form[hidden],
    .account-confirm-email-divider[hidden] {
      display: none !important;
    }

    .divider {
      display: flex;
      align-items: center;
      margin: 24px 0 20px;
      color: var(--text-secondary);
      font-size: 0.85rem;
    }

    .divider::before,
    .divider::after {
      content: '';
      flex: 1;
      height: 1px;
      background: var(--divider);
    }

    .divider span {
      padding: 0 15px;
    }

    .social-buttons {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .social-button {
      width: 100%;
      min-height: 52px;
      padding: 12px 14px;
      border: 1px solid var(--input-border);
      border-radius: 14px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      transition: background-color 0.2s, transform 0.2s, border-color 0.2s, filter 0.2s;
    }

    .social-button.hihing {
      background: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
      border-color: transparent;
      color: var(--accent-contrast);
    }

    .social-button.hihing:hover {
      filter: brightness(1.03);
    }

    .social-button:hover {
      transform: translateY(-1px);
    }

    .social-button.kakao {
      background-color: #fee500;
      border-color: #fee500;
      color: #000;
    }

    .social-button.kakao:hover {
      background-color: #f7df00;
    }

    .social-button.naver {
      background-color: #03c75a;
      border-color: #03c75a;
      color: white;
    }

    .social-button.naver:hover {
      background-color: #02b350;
    }

    .social-button.google {
      background-color: white;
      border-color: var(--input-border);
      color: #333;
    }

    .social-button.google:hover {
      background-color: #f8f8f8;
    }

    .social-button.apple {
      background-color: #000;
      border-color: #000;
      color: white;
    }

    .social-button.apple:hover {
      background-color: #333;
    }

    .social-button svg {
      width: 20px;
      height: 20px;
    }

    .register-link {
      text-align: center;
      margin-top: 24px;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    .register-link a {
      color: var(--accent-start);
      text-decoration: none;
      font-weight: 600;
    }

    .register-link a:hover {
      text-decoration: underline;
    }

    .account-value-prop {
      font-size: 0.9rem;
      line-height: 1.58;
      color: var(--text-primary);
      font-weight: 500;
      margin: 0 0 20px 0;
      padding: 12px 14px;
      background: rgba(91, 108, 255, 0.06);
      border: 1px solid rgba(91, 108, 255, 0.16);
      border-radius: 14px;
    }
    .account-value-prop .highlight-services {
      color: var(--accent-start);
      font-weight: 700;
    }

    .trusted-browser-card {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      padding: 10px 12px;
      border-radius: 12px;
      border: 1px solid var(--input-border);
      background: var(--input-bg);
      box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
    }
    .trust-section {
      margin: 0 0 12px;
    }

    .trusted-browser-card input[type="checkbox"] {
      width: 20px;
      height: 20px;
      min-width: 20px;
      min-height: 20px;
      margin-top: 2px;
      flex-shrink: 0;
      accent-color: var(--accent-start);
      cursor: pointer;
    }

    .trusted-browser-card .copy {
      flex: 1;
      min-width: 0;
    }

    .trusted-browser-card .copy strong {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 2px;
    }

    .trusted-browser-card .copy .hint {
      font-size: 0.75rem;
      line-height: 1.35;
      color: var(--text-secondary);
      margin: 0;
    }

    .loading {
      display: inline-block;
      width: 16px;
      height: 16px;
      border: 2px solid #ffffff;
      border-radius: 50%;
      border-top-color: transparent;
      animation: spin 0.8s linear infinite;
      margin-right: 8px;
      vertical-align: middle;
    }

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

    .hidden {
      display: none !important;
    }

    @media (min-width: 769px) {
      .login-container {
        min-height: auto;
        max-width: 440px;
        /*max-height: calc(100dvh - 56px);
        border-radius: 28px;*/
        border: 1px solid var(--card-border);
        box-shadow: var(--shadow);
        padding: 32px 30px 34px;
      }

      .login-content {
        max-width: 100%;
      }
    }

    @media (max-width: 768px) {
      .login-container {
        padding: 18px 30px 0;
      }

      .brand-header {
        gap: 12px;
        margin-bottom: 20px;
      }

      h1 {
        font-size: 1.5rem;
      }

      .brand-top {
        gap: 10px;
      }
    }

    @media (max-width: 420px) {
      .login-container {
        padding: 16px 30px 24px;
      }

      .logo img {
        width: 82px;
      }

      h1 {
        font-size: 1.36rem;
      }

      .brand-top {
        align-items: flex-start;
      }

      .subtitle {
        font-size: 0.88rem;
      }

      .service-badge {
        padding: 4px 10px;
        font-size: 0.78rem;
      }

      .social-button,
      .login-button {
        min-height: 48px;
        font-size: 0.93rem;
      }

      input {
        padding: 13px 14px;
      }
    }