/* Root variables */
:root {
  --bg: #000;
  --fg: #fafafa;
  --muted: rgba(230, 227, 227, 0.219);
  --accent: #00bfff;
  --surface: rgba(0, 0, 0, 0.7);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  --radius: 10px;
  --container: min(1100px, 100% - 2rem);
}

/* Reset & base */
.reset-all *,
.reset-all *::before,
.reset-all *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.reset-all {
  margin: 0;
  padding: 0;
}

.app {
  font-family: "Inter", sans-serif;
  background-color: var(--bg);
  color: var(--fg);
}
.smooth-scroll {
  scroll-behavior: smooth;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Typography utility classes */
.heading-1 {
  color: var(--fg);
  font-size: clamp(1.8rem, 1.2rem + 2vw, 3rem);
}
.heading-2 {
  color: var(--fg);
  font-size: clamp(1.4rem, 1rem + 1.2vw, 2rem);
}
.heading-3 {
  color: var(--fg);
  font-size: clamp(1.1rem, 0.95rem + 0.8vw, 1.4rem);
}
.text {
  color: var(--fg);
  line-height: 1.6;
}

/* Header & Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  transition: background-color 0.3s ease;

  &.scrolled {
    background-color: rgba(0, 0, 0, 1);
  }

  .site-nav {
    margin-inline: auto;
    width: var(--container);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .nav-logo {
      height: 40px;
    }

    .nav-menu {
      display: flex;
      list-style: none;
      gap: clamp(12px, 2vw, 25px);

      li {
        .nav-link {
          color: var(--fg);
          text-decoration: none;
          padding-bottom: 5px;
          transition: border-color 0.2s ease;
          border-bottom: 2px solid transparent;

          &:hover {
            border-bottom-color: var(--fg);
          }
        }
      }
    }
  }
}

/* Hamburger menu */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 35px;
  height: 35px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1100;
  margin-right: 10px;

  span {
    height: 4px;
    width: 100%;
    background: var(--fg);
    margin: 5px 0;
    border-radius: 2px;
    transition: 0.3s;
    display: block;
  }

  &.open {
    span:nth-child(1) {
      transform: translateY(9px) rotate(45deg);
    }
    span:nth-child(2) {
      opacity: 0;
    }
    span:nth-child(3) {
      transform: translateY(-9px) rotate(-45deg);
    }
  }
}

@media (max-width: 800px) {
  .hamburger {
    display: flex;
  }

  .site-header .site-nav {
    .nav-menu {
      position: absolute;
      top: 60px;
      right: 10px;
      background: rgba(0, 0, 0, 0.98);
      flex-direction: column;
      gap: 0;
      width: 200px;
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      display: none;
      z-index: 1001;
      padding: 20px 0;
      align-items: flex-start;

      &.open {
        display: flex;
      }

      li {
        width: 100%;
        margin: 0;

        .nav-link {
          display: block;
          width: 100%;
          padding: 15px 25px;
          border-bottom: 1px solid rgba(255, 255, 255, 0.08);

          &:hover {
            border-bottom-color: rgba(255, 255, 255, 0.18);
          }
        }

        &:last-child .nav-link {
          border-bottom: none;
        }
      }
    }
  }
}

/* Background visual */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.8;

  img {
    object-fit: cover;
    width: 100%;
    height: 100%;
  }
}

/* Main container */
.main-content {
  margin-inline: auto;
  width: var(--container);
  padding-top: 80px;
  padding-inline: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;

  /* Home */
  .section-home {
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;

    .text {
      max-width: 70ch;
      opacity: 0.95;
    }

    .btn {
      padding: 10px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--fg);
      width: fit-content;
      transition: background-color 0.3s ease, transform 0.1s ease-in-out;
      cursor: pointer;
      background-color: transparent;
      color: var(--fg);

      &:hover {
        background-color: var(--muted);
      }
      &:active {
        transform: scale(0.98);
      }
    }
  }

  /* Exoplanets */
  .section-exoplanets {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    margin-block: 2rem;
    text-align: left;

    .heading-1,
    .heading-3 {
      width: 100%;
      margin: 10px 0;
    }

    ul {
      width: 100%;
      padding-left: 1rem;

      li {
        margin: 0 0 16px 1rem;
      }
    }

    .btn {
      padding: 12px 18px;
      border-radius: var(--radius);
      border: 1px solid var(--fg);
      width: min(350px, 100%);
      transition: background-color 0.3s ease, transform 0.1s ease-in-out;
      cursor: pointer;
      background-color: transparent;
      margin: 20px 0;
      color: var(--fg);

      &:hover {
        background-color: var(--muted);
      }
      &:active {
        transform: scale(0.98);
      }
    }

    /* Search form */
    #search-form {
      width: 100%;
      background: rgba(0, 0, 0, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow);
    }

    .search-form .form-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 12px;
    }

    @media (max-width: 900px) {
      .search-form .form-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }
    @media (max-width: 600px) {
      .search-form .form-grid {
        grid-template-columns: 1fr;
      }
    }

    .search-form .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .search-form label {
      font-size: 0.95rem;
    }
    .search-form input,
    .search-form select {
      padding: 10px 12px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.25);
      background: rgba(0, 0, 0, 0.4);
      color: var(--fg);
      outline: none;
    }
    .search-form input:focus,
    .search-form select:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(0, 191, 255, 0.15);
    }
    .search-form .form-actions {
      display: flex;
      gap: 10px;
      justify-content: flex-end;
      margin-top: 12px;
    }
    .btn.btn-secondary {
      opacity: 0.85;
    }
  }

  /* Databases */
  .section-databases {
    display: grid;
    gap: 2.5rem;
    margin-block: 3rem;

    /* common layout for each dataset block (kepler, K2, Tess) */
    > .dataset-grid {
      display: grid;
      grid-template-columns: 180px 1fr 360px;
      align-items: center;
      gap: 1.25rem;

      /* icon + title column */
      > div:first-of-type {
        width: 150px;
        text-align: center;
        .heading-2 {
          line-height: 1.2;
        }
      }

      /* stats card column */
      .dados {
        display: grid;
        gap: 12px;

        > div {
          text-align: start;
          display: block;
          width: 100%;
          margin: 0;
          padding: 15px;
          border: 1px solid var(--fg);
          border-radius: var(--radius);

          .stat-value {
            font-size: clamp(1.25rem, 1rem + 1vw, 1.875rem);
            margin: 10px 0 0 0;
          }

          .progress-bar {
            width: 100%;
            height: 8px;
            background-color: var(--muted);
            border-radius: 4px;
            overflow: hidden;
            margin-top: 10px;

            span {
              display: block;
              height: 100%;
              width: 0%;
              background-color: var(--fg);
              transition: width 0.4s ease-in-out;
            }
          }
        }
      }
    }

    @media (max-width: 1024px) {
      > .dataset-grid {
        grid-template-columns: 160px 1fr;
      }
      > .dataset-grid .dados {
        grid-column: 1 / -1;
        grid-template-columns: repeat(3, minmax(0, 1fr));
      }
    }

    @media (max-width: 700px) {
      > .dataset-grid {
        grid-template-columns: 1fr;
      }
      > .dataset-grid .text {
        text-align: justify;
      }
      > .dataset-grid .dados {
        grid-template-columns: 1fr;
      }
    }
  }

  /* Results */
  .section-results {
    margin-block: 3rem;

    .search-results-container {
      margin: 1rem 0 2rem 0;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius);
      background: rgba(0, 0, 0, 0.3);
      box-shadow: var(--shadow);
      padding: 1rem;
    }

    .table-wrap {
      width: 100%;
      overflow-x: auto;
    }
    .results-table {
      width: 100%;
      border-collapse: collapse;
    }
    .results-table thead th {
      text-align: left;
      padding: 10px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.2);
      white-space: nowrap;
    }
    .results-table tbody td {
      padding: 10px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      vertical-align: top;
    }

    .pager {
      margin-top: 12px;
      display: flex;
      gap: 10px;
      align-items: center;
      justify-content: flex-end;
    }
    .pager .pager-info {
      opacity: 0.85;
      font-size: 0.95rem;
    }

    .resultsGrafico {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 1rem;

      @media (max-width: 800px) {
        grid-template-columns: 1fr;
      }
    }
  }
}

/* Quiz */
.section-quiz {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  text-align: center;

  .heading-1 {
    font-size: 2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 30px;
  }

  #quiz-container {
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: clamp(20px, 4vw, 30px);
    width: min(600px, 90%);
    box-shadow: 0 0 25px rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(3px);
    background: rgba(0, 0, 0, 0.3);
  }

  .question-box {
    .heading-2,
    h2 {
      font-size: 1.2rem;
      margin-bottom: 10px;
      color: var(--accent);
    }
    p,
    .text {
      font-size: 1rem;
      margin-bottom: 20px;
      line-height: 1.5;
    }
  }

  button,
  .btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    font-size: 1rem;
    border-radius: 10px;
    padding: 10px 15px;
    margin: 10px 0;
    width: 100%;
    cursor: pointer;
    transition: all 0.3s ease;

    &:hover {
      background: var(--accent);
      border-color: var(--accent);
      color: #000;
    }
  }

  ul {
    list-style: none;
    padding: 0;
    margin-top: 20px;
    text-align: left;
  }

  li {
    margin: 8px 0;
    line-height: 1.4;
  }
  strong {
    font-weight: 600;
  }

  /* Finish button */
  .finish-btn {
    background: var(--accent);
    color: #000;
    border: none;
    margin-top: 20px;
    width: auto;
    padding: 10px 30px;
    font-weight: bold;

    &:hover {
      background: #0099cc;
    }
  }
}

/* Small utility tweaks */
@media (max-width: 600px) {
  .site-header .site-nav {
    padding-block: 1rem;
  }
}

.container {
  text-align: center;
  position: relative;
}

.heading-1 {
  margin-bottom: 2rem;
}

.flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.step {
  background: #1e1e1e;
  padding: 10px 20px;
  border-radius: 6px;
  max-width: 300px;
  position: relative;
}

.line {
  background: white;
}

.line.vertical {
  width: 3px;
  height: 60px;
}

.line.horizontal {
  height: 3px;
  width: 120px;
  position: relative;
}

.step.right {
  align-self: flex-start;
  margin-left: 40px;
}

.step.down {
  align-self: center;
}

.step.up {
  align-self: center;
  margin-top: -40px;
}