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

    :root {
      --c-primary: #00C587;
      --c-primary-light: #d6ffec9f;
      --c-primary-dark: #191544;
      --c-accent: #1a7d60;
      --c-text: #1a1a2e;
      --c-text-muted: #5F5E5A;
      --c-border: rgba(83, 74, 183, 0.15);
      --shadow: 0 18px 60px rgba(25, 21, 68, 0.12);
      --danger: #d54848;
      --success: #0b8f63;
    }

    html { scroll-behavior: smooth; }

    body {
      min-height: 100vh;
      font-family: 'Segoe UI', system-ui, sans-serif;
      color: var(--c-text);
      background:
        radial-gradient(circle at top right, rgba(83, 74, 183, 0.14) 0%, transparent 28%),
        linear-gradient(135deg, #EEEDFE 0%, #E1F5EE 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 24px;
      overflow-x: hidden;
    }

    button, input {
      font: inherit;
    }

    .auth-shell {
      width: 100%;
      max-width: 620px;
    }

    .back-home-link {
      position: fixed;
      top: 20px;
      left: 20px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--c-text-muted);
      text-decoration: none;
      font-size: .85rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: 12px;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(8px);
      border: 1px solid transparent;
      transition: color .2s ease, border-color .2s ease, background .2s ease;
      z-index: 10;
    }

    .back-home-link:hover {
      color: var(--c-primary-dark);
      border-color: var(--c-border);
      background: rgba(255,255,255,0.94);
    }

    .back-home-link svg { flex-shrink: 0; }

    .auth-card {
      position: relative;
      background: rgba(255,255,255,0.94);
      backdrop-filter: blur(14px);
      border: 1px solid var(--c-border);
      border-radius: 28px;
      box-shadow: var(--shadow);
      padding: 2rem;
      overflow: hidden;
    }

    .auth-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
    }

    .auth-tabs {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: .5rem;
      padding: .4rem;
      background: rgba(25, 21, 68, 0.05);
      border-radius: 18px;
      margin-bottom: 1.5rem;
    }

    .auth-tab {
      border: none;
      background: transparent;
      color: var(--c-text-muted);
      border-radius: 14px;
      min-height: 46px;
      padding: 0 1rem;
      font-size: .92rem;
      font-weight: 700;
      cursor: pointer;
      transition: background .2s ease, color .2s ease, transform .2s ease;
    }

    .auth-tab.active {
      background: #fff;
      color: var(--c-primary-dark);
      box-shadow: 0 8px 20px rgba(25, 21, 68, 0.08);
    }

    .auth-tab:hover {
      transform: translateY(-1px);
    }

    .auth-heading {
      margin-bottom: 1.25rem;
      text-align: center;
    }

    .auth-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--c-primary);
      background: var(--c-primary-light);
      border: 1px solid rgba(0,197,135,0.26);
      padding: 5px 12px;
      border-radius: 999px;
      font-size: .76rem;
      font-weight: 700;
      margin-bottom: .9rem;
      text-transform: uppercase;
      letter-spacing: .4px;
    }

    .auth-title {
      font-size: clamp(1.8rem, 3vw, 2.5rem);
      line-height: 1.1;
      color: var(--c-primary-dark);
      letter-spacing: -.7px;
      margin-bottom: .55rem;
    }

    .auth-subtitle {
      color: var(--c-text-muted);
      font-size: .97rem;
      max-width: 480px;
      margin: 0 auto;
    }

    .auth-panel {
      display: none;
    }

    .auth-panel.active {
      display: block;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 1rem;
    }

    .field {
      display: flex;
      flex-direction: column;
      gap: .45rem;
      margin-bottom: 1rem;
    }

    .field.full {
      grid-column: 1 / -1;
    }

    .field label {
      font-size: .84rem;
      font-weight: 700;
      color: var(--c-primary-dark);
    }

    .input-wrap {
      position: relative;
    }

    .field input {
      width: 100%;
      min-height: 56px;
      border-radius: 16px;
      border: 1px solid var(--c-border);
      background: #fff;
      color: var(--c-text);
      padding: 0 1rem;
      font-size: .95rem;
      outline: none;
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    .field input:focus {
      border-color: rgba(0,197,135,0.48);
      box-shadow: 0 0 0 4px rgba(0,197,135,0.10);
    }

    .field input.error {
      border-color: rgba(213,72,72,.55);
      box-shadow: 0 0 0 4px rgba(213,72,72,.08);
    }

    .field select {
      width: 100%;
      min-height: 56px;
      border-radius: 16px;
      border: 1px solid var(--c-border);
      background-color: #fff;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='13' height='13' viewBox='0 0 24 24' fill='none' stroke='%235F5E5A' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 1rem center;
      color: var(--c-text);
      padding: 0 2.8rem 0 1rem;
      font: inherit;
      font-size: .95rem;
      outline: none;
      appearance: none;
      -webkit-appearance: none;
      cursor: pointer;
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    .field select.empty { color: var(--c-text-muted); }

    .field select:focus {
      border-color: rgba(0,197,135,0.48);
      box-shadow: 0 0 0 4px rgba(0,197,135,0.10);
    }

    .field select.error {
      border-color: rgba(213,72,72,.55);
      box-shadow: 0 0 0 4px rgba(213,72,72,.08);
    }

    .field select:disabled {
      opacity: .45;
      cursor: not-allowed;
    }

    .toggle-password {
      position: absolute;
      top: 50%;
      right: .8rem;
      transform: translateY(-50%);
      border: none;
      background: transparent;
      color: var(--c-text-muted);
      cursor: pointer;
      font-size: .85rem;
      font-weight: 700;
      padding: .25rem;
    }

    .row-between {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      margin-bottom: 1rem;
      flex-wrap: wrap;
    }

    .check {
      display: inline-flex;
      align-items: center;
      gap: .6rem;
      font-size: .88rem;
      color: var(--c-text-muted);
    }

    .check input {
      width: 16px;
      height: 16px;
      accent-color: var(--c-primary);
    }

    .mini-link {
      color: var(--c-primary);
      text-decoration: none;
      font-size: .88rem;
      font-weight: 700;
    }

    .mini-link:hover {
      text-decoration: underline;
    }

    .submit-btn {
      width: 100%;
      min-height: 58px;
      border: none;
      border-radius: 18px;
      background: var(--c-primary);
      color: #fff;
      font-size: .98rem;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
      box-shadow: 0 10px 26px rgba(0,197,135,0.25);
    }

    .submit-btn:hover {
      background: var(--c-primary-dark);
      transform: translateY(-2px);
    }

    .form-note {
      margin-top: .95rem;
      color: var(--c-text-muted);
      font-size: .82rem;
      text-align: center;
    }

    .auth-switch {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: .4rem;
      flex-wrap: wrap;
      margin-top: 1rem;
      font-size: .9rem;
      color: var(--c-text-muted);
    }

    .auth-switch button {
      border: none;
      background: transparent;
      color: var(--c-primary);
      font-weight: 700;
      cursor: pointer;
    }

    .auth-switch button:hover {
      text-decoration: underline;
    }

    .status-box {
      margin-top: 1rem;
      border-radius: 16px;
      padding: .95rem 1rem;
      font-size: .88rem;
      display: none;
      border: 1px solid transparent;
    }

    .status-box.show {
      display: block;
    }

    .status-box.success {
      background: rgba(11,143,99,.08);
      color: var(--success);
      border-color: rgba(11,143,99,.18);
    }

    .status-box.error {
      background: rgba(213,72,72,.08);
      color: var(--danger);
      border-color: rgba(213,72,72,.18);
    }

    .hidden {
      display: none !important;
    }

    /* ============================================================
       RESPONSIVE SYSTEM
       Breakpoints: 1024px | 920px | 640px | 400px
    ============================================================ */

    @media (max-width: 1024px) {
      body { padding: 20px; }
      .auth-shell { max-width: 580px; }
      .auth-card { padding: 1.8rem; }
      .auth-title { font-size: clamp(1.7rem, 2.8vw, 2.3rem); }
    }

    @media (max-width: 920px) {
      body { padding: 18px; align-items: flex-start; padding-top: 32px; }
      .auth-shell { max-width: 540px; width: 100%; }
      .auth-card { padding: 1.6rem; border-radius: 26px; }
      .field input { min-height: 52px; }
      .submit-btn { min-height: 54px; }
    }

    @media (max-width: 640px) {
      body { padding: 16px; align-items: flex-start; padding-top: 24px; }
      .auth-shell { max-width: 100%; }
      .auth-card { padding: 1.2rem; border-radius: 24px; }
      .auth-tabs { grid-template-columns: 1fr; gap: .35rem; }
      .auth-tab { min-height: 42px; font-size: .88rem; }
      .form-grid { grid-template-columns: 1fr; }
      .row-between { flex-direction: column; align-items: flex-start; gap: .65rem; }
      .submit-btn { width: 100%; }
      .auth-title { font-size: clamp(1.5rem, 5vw, 2rem); }
      .auth-subtitle { font-size: .9rem; }
    }

    @media (max-width: 400px) {
      body { padding: 12px; padding-top: 16px; }
      .back-home-link { top: 12px; left: 12px; font-size: .78rem; padding: 6px 10px; }
      .auth-card { padding: 1rem; border-radius: 20px; }
      .auth-tabs { padding: .3rem; border-radius: 14px; }
      .auth-tab { border-radius: 10px; min-height: 40px; font-size: .84rem; }
      .auth-eyebrow { font-size: .7rem; padding: 4px 10px; }
      .auth-title { font-size: 1.4rem; letter-spacing: -.5px; }
      .field input { min-height: 48px; border-radius: 12px; font-size: .9rem; }
      .submit-btn { min-height: 50px; border-radius: 14px; font-size: .92rem; }
      .auth-switch { font-size: .84rem; }
      .form-note { font-size: .78rem; }
      .status-box { font-size: .82rem; padding: .8rem .9rem; border-radius: 12px; }
    }