.font-sans {
      font-family: 'Roboto', Arial, sans-serif;
    }

:root {
      --red: #df0008;
      --ink: #101722;
      --muted: #7b8493;
      --line: #d9e0ea;
    }

    * { box-sizing: border-box; }
    html, body { min-height: 100%; }

    body {
      font-family: 'Roboto', Arial, sans-serif;
      margin: 0;
      color: var(--ink);
      background: #b70000;
    }

    .auth-page {
      position: relative;
      min-height: 100vh;
      overflow-x: hidden;
      background:
        linear-gradient(180deg, rgba(203, 0, 0, 0.84) 0%, rgba(171, 0, 0, 0.92) 100%),
        url("../public/background-trongdong.jpg") center center / cover no-repeat;
    }

    .auth-page::before {
      content: "";
      position: fixed;
      inset: -12vh -10vw;
      pointer-events: none;
      background:
        radial-gradient(circle at 50% 50%, rgba(255, 225, 130, 0.18) 0 21%, transparent 22%),
        radial-gradient(circle at 50% 51%, transparent 0 30%, rgba(255, 198, 80, 0.16) 31%, transparent 52%),
        radial-gradient(circle at 49% 50%, transparent 0 48%, rgba(255, 219, 142, 0.16) 49%, transparent 64%);
      mix-blend-mode: screen;
      opacity: 0.5;
    }

    .auth-page::after {
      content: "";
      position: fixed;
      inset: 0;
      pointer-events: none;
      background:
        radial-gradient(circle at 50% 32%, rgba(255, 215, 125, 0.14), transparent 23rem),
        linear-gradient(90deg, rgba(121, 0, 0, 0.24), transparent 18%, transparent 82%, rgba(121, 0, 0, 0.24));
    }

    .auth-shell {
      position: relative;
      z-index: 1;
      width: min(100%, 1160px);
      min-height: 100vh;
      margin: 0 auto;
      padding: 34px 24px 32px;
    }

    .brand-logo {
      width: 116px;
      height: 80px;
      object-fit: contain;
      filter: drop-shadow(0 10px 14px rgba(88, 0, 0, 0.35));
    }

    .brand-title {
      margin-top: 14px;
      color: #fff;
      text-align: center;
      font-size: clamp(27px, 3vw, 36px);
      font-weight: 600;
      line-height: 1.15;
      text-shadow: 0 3px 9px rgba(94, 0, 0, 0.18);
    }

    .brand-subtitle {
      margin-top: 10px;
      color: rgba(255, 255, 255, 0.98);
      text-align: center;
      font-size: clamp(16px, 1.75vw, 21px);
      font-weight: 600;
      line-height: 1.42;
      text-shadow: 0 2px 8px rgba(94, 0, 0, 0.16);
    }

    .auth-card {
      width: min(100%, 640px);
      margin: 28px auto 0;
      border-radius: 24px;
      background: rgba(255, 255, 255, 0.98);
      padding: 34px 48px 32px;
      box-shadow:
        0 26px 60px rgba(79, 0, 0, 0.28),
        inset 0 1px 0 rgba(255, 255, 255, 0.95);
    }

    .card-heading {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 14px;
      color: var(--red);
      font-size: 22px;
      font-weight: 600;
      line-height: 1.2;
      text-transform: uppercase;
    }

    .heading-icon {
      display: grid;
      width: 46px;
      height: 46px;
      place-items: center;
      border: 2px solid var(--red);
      border-radius: 999px;
      color: var(--red);
      flex: 0 0 auto;
    }

    .help-text {
      margin: 20px auto 0;
      max-width: 500px;
      color: #667085;
      text-align: center;
      font-size: 15px;
      font-weight: 600;
      line-height: 1.55;
    }

    .field-group {
      margin-top: 28px;
    }

    .field-label {
      display: block;
      margin-bottom: 11px;
      color: #111827;
      font-size: 17px;
      font-weight: 600;
      line-height: 1.2;
    }

    .required {
      color: var(--red);
      font-weight: 600;
    }

    .input-wrap {
      position: relative;
      display: block;
    }

    .auth-input {
      width: 100%;
      height: 54px;
      border: 1px solid var(--line);
      border-radius: 7px;
      background: #fff;
      padding: 0 54px;
      color: #1f2937;
      font-size: 16px;
      font-weight: 500;
      outline: none;
      transition: border-color 160ms ease, box-shadow 160ms ease;
    }

    .auth-input::placeholder {
      color: #8b95a5;
      font-weight: 500;
    }

    .auth-input:focus {
      border-color: #e60000;
      box-shadow: 0 0 0 4px rgba(230, 0, 0, 0.1);
    }

    .input-icon {
      position: absolute;
      left: 20px;
      top: 50%;
      width: 22px;
      height: 22px;
      color: #9aa4b3;
      transform: translateY(-50%);
      stroke-width: 2;
    }

    .hint-box {
      display: flex;
      gap: 12px;
      margin-top: 18px;
      border: 1px solid #f5c7c7;
      border-radius: 8px;
      background: #fff7f7;
      padding: 14px 15px;
      color: #b42318;
      font-size: 14px;
      font-weight: 600;
      line-height: 1.45;
    }

    .primary-btn,
    .secondary-btn {
      display: inline-flex;
      width: 100%;
      height: 58px;
      align-items: center;
      justify-content: center;
      gap: 14px;
      border-radius: 8px;
      font-size: 19px;
      font-weight: 600;
      line-height: 1;
      text-decoration: none;
      transition: transform 160ms ease, box-shadow 160ms ease, filter 160ms ease;
    }

    .primary-btn {
      margin-top: 30px;
      border: 0;
      background: linear-gradient(180deg, #ed000b 0%, #d80008 100%);
      color: #fff;
      box-shadow: 0 13px 22px rgba(184, 0, 0, 0.21);
    }

    .primary-btn:hover {
      filter: brightness(1.04);
      box-shadow: 0 16px 25px rgba(184, 0, 0, 0.25);
    }

    .secondary-btn {
      margin-top: 14px;
      border: 1.5px solid var(--red);
      background: #fff;
      color: var(--red);
    }

    .secondary-btn:hover {
      background: #fff8f8;
      box-shadow: 0 10px 18px rgba(204, 0, 0, 0.09);
    }

    .primary-btn:active,
    .secondary-btn:active {
      transform: translateY(1px);
    }

    @media (max-width: 720px) {
      .auth-shell {
        padding: 24px 16px 28px;
      }

      .brand-logo {
        width: 104px;
        height: 72px;
      }

      .auth-card {
        margin-top: 22px;
        border-radius: 20px;
        padding: 26px 20px 24px;
      }

      .card-heading {
        font-size: 18px;
      }

      .field-label,
      .help-text,
      .hint-box {
        font-size: 14px;
      }

      .auth-input,
      .primary-btn,
      .secondary-btn {
        height: 54px;
      }
    }