:root {
      color-scheme: dark;

      --bg: #101418;
      --surface: #171d24;
      --surface-2: #202833;
      --text: #95a4b6;
      --text2: #dce3e9;
      --text3: #bec9da;
      --blue: #73a7ff;
      --line: #4e6177;

      --shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
    }

    * {
      box-sizing: border-box;
    }

    html {
      min-height: 100%;
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      min-height: 100dvh;
      color: var(--text2);
      font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

      background:
        radial-gradient(
          ellipse at 50% 0%,
          rgba(77, 141, 255, 0.12),
          transparent 55%
        ),
        linear-gradient(180deg, #101418 0%, #121820 100%);

      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    a:focus-visible {
      outline: 3px solid var(--blue);
      outline-offset: 4px;
    }

    /* Main content */

    main {
      width: min(1000px, calc(100% - 40px));
      margin: 0 auto;
      padding: 36px 0 64px;
    }

    /* Go back */

    .back-button {
      display: inline-flex;
      align-items: center;
      gap: 9px;

      width: fit-content;
      margin: 0 0 36px 2px;

      color: var(--text);
      font-size: 14px;
      font-weight: 600;

      transition:
        color 160ms ease,
        transform 160ms ease;
    }

    .back-button:hover {
      color: var(--blue);
      transform: translateX(-3px);
    }

    .back-button svg {
      width: 18px;
      height: 18px;
      flex: 0 0 auto;

      fill: none;
      stroke: currentColor;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
    }

    /* Intro */

    .intro {
      max-width: 680px;
      margin: 0 auto 42px;
      text-align: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;

      margin-bottom: 18px;
      padding: 7px 12px;

      color: var(--blue);
      background: rgba(115, 167, 255, 0.09);
      border: 1px solid rgba(115, 167, 255, 0.2);
      border-radius: 999px;

      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.09em;
      text-transform: uppercase;
    }

    .eyebrow span {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--blue);
      box-shadow: 0 0 10px rgba(115, 167, 255, 0.7);
    }

    h1 {
      margin: 0;
      color: var(--text2);
      font-size: clamp(32px, 5vw, 48px);
      font-weight: 750;
      letter-spacing: -0.045em;
      line-height: 1.12;
    }

    .intro p {
      max-width: 550px;
      margin: 18px auto 0;

      color: var(--text);
      font-size: 16px;
      line-height: 1.75;
    }

    /* GitHub notice */

    .github-notice {
      max-width: 680px;
      margin: 0 auto 32px;
      padding: 16px 18px;

      color: #d1d9e0;
      background: var(--surface);
      border: 1px solid #303b49;
      border-radius: 12px;
    }

    .github-notice h2 {
      margin: 0 0 8px;
      color: #fff;
      font-size: 1.05rem;
    }

    .github-notice p {
      margin: 8px 0 0;
      line-height: 1.6;
    }

    .github-notice a {
      color: var(--blue);
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .github-notice a:hover {
      color: #a4c7ff;
    }

    /* Feedback cards */

    .feedback-options {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 22px;
    }

    .feedback-card {
      position: relative;
      min-width: 0;
      min-height: 290px;
      padding: 30px;

      display: flex;
      flex-direction: column;
      align-items: flex-start;

      overflow: hidden;

      background:
        linear-gradient(
          145deg,
          rgba(32, 40, 51, 0.96),
          rgba(23, 29, 36, 0.98)
        );

      border: 1px solid rgba(78, 97, 119, 0.55);
      border-radius: 20px;
      box-shadow: var(--shadow);

      transition:
        transform 200ms ease,
        border-color 200ms ease,
        background 200ms ease,
        box-shadow 200ms ease;
    }

    .feedback-card::before {
      content: "";
      position: absolute;
      top: -85px;
      right: -75px;

      width: 190px;
      height: 190px;

      background: rgba(115, 167, 255, 0.06);
      border-radius: 50%;
      filter: blur(5px);
      pointer-events: none;

      transition:
        transform 250ms ease,
        background 250ms ease;
    }

    .feedback-card:hover {
      transform: translateY(-5px);
      border-color: rgba(115, 167, 255, 0.65);
      box-shadow:
        0 18px 42px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(115, 167, 255, 0.06);
    }

    .feedback-card:hover::before {
      transform: scale(1.25);
      background: rgba(115, 167, 255, 0.11);
    }

    .card-icon {
      position: relative;
      width: 58px;
      height: 58px;
      margin-bottom: 25px;

      display: grid;
      place-items: center;

      color: var(--blue);
      background: rgba(115, 167, 255, 0.1);
      border: 1px solid rgba(115, 167, 255, 0.23);
      border-radius: 16px;
    }

    .card-icon svg {
      width: 29px;
      height: 29px;
      stroke: currentColor;
      stroke-width: 1.8;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
    }

    .feedback-card h2 {
      position: relative;
      margin: 0 0 12px;

      color: var(--text2);
      font-size: clamp(21px, 2.5vw, 25px);
      font-weight: 700;
      letter-spacing: -0.025em;
    }

    .feedback-card p {
      position: relative;
      margin: 0 0 26px;

      color: var(--text);
      font-size: 14px;
      line-height: 1.8;
    }

    .card-action {
      position: relative;
      width: 100%;
      margin-top: auto;
      padding: 13px 16px;

      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;

      color: #101418;
      background: var(--blue);
      border: 1px solid transparent;
      border-radius: 11px;

      font-size: 14px;
      font-weight: 750;
      text-align: center;

      transition:
        background 160ms ease,
        transform 160ms ease;
    }

    .card-action svg {
      width: 17px;
      height: 17px;
      flex: 0 0 auto;

      stroke: currentColor;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;

      transition: transform 160ms ease;
    }

    .feedback-card:hover .card-action {
      background: #91baff;
    }

    .feedback-card:hover .card-action svg {
      transform: translateX(3px);
    }

    /* Footer */

    footer {
      width: min(1000px, calc(100% - 40px));
      margin: 0 auto;
      padding: 22px 0 28px;

      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;

      border-top: 1px solid rgba(78, 97, 119, 0.3);

      color: var(--text);
      font-size: 12px;
    }

    footer a {
      color: var(--text3);
      transition: color 160ms ease;
    }

    footer a:hover {
      color: var(--blue);
    }

    /* Responsive layout */

    @media (max-width: 700px) {
      main {
        width: calc(100% - 32px);
        padding-top: 24px;
      }

      .back-button {
        margin-bottom: 32px;
      }

      .intro {
        margin-bottom: 32px;
      }

      .intro p {
        font-size: 15px;
      }

      .feedback-options {
        grid-template-columns: minmax(0, 1fr);
        gap: 16px;
      }

      .feedback-card {
        min-height: 0;
        padding: 25px;
      }

      .card-icon {
        margin-bottom: 20px;
      }

      footer {
        width: calc(100% - 32px);
      }
    }

    @media (max-width: 360px) {
      main {
        width: calc(100% - 24px);
      }

      .feedback-card {
        padding: 20px;
      }

      h1 {
        font-size: 31px;
      }

      footer {
        width: calc(100% - 24px);
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
      }
    }
.before-submit {
    border: 1px solid rgba(255, 204, 92, 0.55);
    box-shadow: 0 0 12px rgba(255, 204, 92, 0.08);
}