:root {
    --bg: #030507;
    --bg-elevated: #0c0f14;
    --card-bg: #10141a;
    --card-bg-hover: #141920;
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.14);
    --blue: #2f8fe8;
    --blue-bright: #4aa3ff;
    --blue-deep: #145bb0;
    --silver: #b7bac0;
    --silver-dim: #7d8189;
    --text: #eef1f5;
    --text-dim: #a4a9b1;
    --text-faint: #6b7078;
    --amber: #e0a84e;
  }

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

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
  }

  a { color: var(--blue-bright); text-decoration: none; }

  /* ---------- Nav ---------- */
  nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(3,5,7,0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 14px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .logo-img {
    height: 34px;
    display: block;
  }

  .nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
  }

  .nav-links a {
    color: var(--text-dim);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.15s ease;
  }

  .nav-links a:hover { color: #fff; }

  .nav-dropdown {
    position: relative;
  }

  .nav-dropdown summary {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    list-style: none;
    color: var(--text-dim);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.15s ease;
  }

  .nav-dropdown summary::-webkit-details-marker { display: none; }

  .nav-dropdown summary:hover,
  .nav-dropdown[open] summary { color: #fff; }

  .nav-dropdown summary::after {
    content: "";
    width: 6px;
    height: 6px;
    margin-top: -3px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.15s ease;
  }

  .nav-dropdown[open] summary::after {
    transform: rotate(-135deg);
    margin-top: 3px;
  }

  .nav-dropdown-menu {
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    display: flex;
    flex-direction: column;
    min-width: 220px;
    padding: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    z-index: 20;
  }

  .nav-dropdown-menu a {
    padding: 9px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-dim);
    white-space: nowrap;
  }

  .nav-dropdown-menu a:hover {
    background: var(--card-bg-hover);
    color: #fff;
  }

  .nav-social {
    display: flex;
    align-items: center;
    gap: 14px;
  }

  .nav-social a {
    display: inline-flex;
  }

  .nav-social svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    display: block;
  }

  /* ---------- Hero ---------- */
  .hero {
    background:
      radial-gradient(circle at 15% 20%, rgba(47,143,232,0.16) 0%, transparent 45%),
      radial-gradient(circle at 85% 0%, rgba(183,186,192,0.08) 0%, transparent 40%),
      var(--bg);
    padding: 100px 32px 90px;
    text-align: center;
    border-bottom: 1px solid var(--border);
  }

  .hero-eyebrow {
    color: var(--blue-bright);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 18px;
    text-align: center;
  }

  .hero-about {
    color: var(--text-dim);
    font-size: 0.98rem;
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto 40px;
    text-align: left;
  }

  .hero-about p {
    margin: 0 0 14px;
  }

  .hero-about p:last-child {
    margin-bottom: 0;
  }

  .hero h1 {
    font-size: 2.7rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    max-width: 740px;
    margin: 0 auto 18px;
    background: linear-gradient(135deg, #ffffff 0%, var(--silver) 55%, var(--blue-bright) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero p {
    color: var(--text-dim);
    font-size: 1.1rem;
    max-width: 560px;
    margin: 0 auto 34px;
  }

  .btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--blue-bright) 0%, var(--blue-deep) 100%);
    color: #fff;
    font-weight: 700;
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 0.95rem;
    box-shadow: 0 4px 20px rgba(47,143,232,0.25);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
  }

  .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 26px rgba(47,143,232,0.4);
  }

  .btn-outline {
    display: inline-block;
    border: 1.5px solid var(--border-strong);
    color: var(--text);
    font-weight: 600;
    padding: 12px 26px;
    border-radius: 8px;
    font-size: 0.95rem;
    margin-left: 12px;
  }

  .btn-outline:hover { border-color: var(--silver); }

  /* ---------- Sections ---------- */
  section.content {
    max-width: 1040px;
    margin: 0 auto;
    padding: 80px 32px;
  }

  .section-header {
    text-align: center;
    margin-bottom: 48px;
  }

  .section-header .eyebrow {
    color: var(--blue-bright);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 10px;
  }

  .section-header h2 {
    font-size: 2.7rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    max-width: 740px;
    margin: 0 auto 12px;
    background: linear-gradient(135deg, #ffffff 0%, var(--silver) 55%, var(--blue-bright) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .section-header p {
    color: var(--text-dim);
    max-width: 560px;
    margin: 0 auto;
    font-size: 1rem;
  }

  /* ---------- Position Cards ---------- */
  .positions-grid {
    display: grid;
    gap: 40px;
  }

  .role-group {
    scroll-margin-top: 90px;
  }

  .role-group-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--blue-bright);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0 0 14px;
  }

  .role-group-items {
    display: grid;
    gap: 16px;
  }

  .role-group-empty {
    color: var(--text-dim);
    font-size: 0.95rem;
    padding: 22px 26px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
  }

  details.role {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
  }

  details.role[open] {
    border-color: var(--border-strong);
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  }

  details.role summary {
    list-style: none;
    cursor: pointer;
    padding: 22px 26px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  details.role summary:hover { background: var(--card-bg-hover); }

  details.role summary::-webkit-details-marker { display: none; }

  .role-title-block { display: flex; flex-direction: column; gap: 7px; }

  .role-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
  }

  .role-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
  }

  .tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 100px;
  }

  .tag.eng { background: rgba(47,143,232,0.15); color: var(--blue-bright); }
  .tag.product { background: rgba(183,186,192,0.15); color: var(--silver); }
  .tag.sales { background: rgba(224,168,78,0.15); color: var(--amber); }

  .role-location {
    color: var(--text-faint);
    font-size: 0.85rem;
  }

  .role-salary {
    color: var(--text-faint);
    font-size: 0.85rem;
  }

  .role-benefits {
    color: var(--text-faint);
    font-size: 0.85rem;
    margin-top: 6px;
  }

  .chevron {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    color: var(--text-faint);
    transition: transform 0.2s ease;
  }

  details.role[open] .chevron { transform: rotate(180deg); }

  .role-body {
    padding: 0 26px 26px;
    border-top: 1px solid var(--border);
    padding-top: 20px;
  }

  .role-body p.summary-text {
    color: var(--text-dim);
    margin-bottom: 18px;
  }

  .role-body h4 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--silver-dim);
    margin-bottom: 10px;
    margin-top: 18px;
  }

  .role-body ul {
    padding-left: 20px;
    color: var(--text-dim);
  }

  .role-body ul ul {
    margin-top: 8px;
    padding-left: 18px;
    list-style-type: circle;
  }

  .role-body ul ul li {
    color: var(--text-faint);
    font-size: 0.94em;
  }

  .role-body li { margin-bottom: 6px; }

  .apply-link {
    display: inline-block;
    margin-top: 20px;
    font-weight: 700;
    color: var(--blue-bright);
  }

  /* ---------- Internship banner ---------- */
  .intern-section {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  @media (max-width: 720px) {
    .hero h1, .section-header h2 { font-size: 2rem; }

    nav {
      flex-wrap: wrap;
      row-gap: 10px;
      padding: 14px 16px;
    }

    .nav-links {
      width: 100%;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px 14px;
    }

    .nav-links a, .nav-dropdown summary { font-size: 0.85rem; }

    .nav-social { gap: 10px; }
  }

  /* ---------- Footer ---------- */
  footer {
    background: #020304;
    color: var(--text-faint);
    text-align: center;
    padding: 40px 32px;
    font-size: 0.88rem;
  }

  footer a { color: var(--blue-bright); font-weight: 600; }

  .placeholder-note {
    max-width: 1040px;
    margin: 0 auto;
    padding: 14px 32px 0;
    text-align: center;
    color: var(--text-faint);
    font-size: 0.78rem;
  }