:root {
      --bg: #1e1e1e;
      --surface: #121212;
      --border: rgba(255,255,255,0.12);
      --primary: rgb(59,141,255);
      --success: rgb(76,175,80);
      --info: rgb(33,150,243);
      --text: rgb(208,208,208);
      --text-weak: rgb(80,80,90);
      --appbar-h: 56px;
      --footer-h: 116px;
    }

    * { box-sizing: border-box; }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
      font-size: 14px;
      min-height: 100vh;
      margin: 0;
    }

    /* ── APPBAR ── */
    .appbar {
      position: fixed;
      top: 0; left: 0; right: 0;
      height: var(--appbar-h);
      background: transparent;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding: 0 16px;
      z-index: 100;
    }

    .btn-lang {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: transparent;
      border: none;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      transition: background 0.15s;
    }
    .btn-lang:hover { background: rgba(255,255,255,0.06); }

    /* ── MAIN ── */
    .main-wrap {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: calc(var(--appbar-h) + 16px) 16px calc(var(--footer-h) + 16px);
    }

    .login-container {
      width: 100%;
      max-width: 600px;
    }

    .login-title {
      font-size: 1.25rem;
      font-weight: 900;
      color: #fff;
      margin-bottom: 12px;
    }

    /* ── CARD ── */
    .login-card {
      background: var(--surface);
      border-radius: 12px;
      padding: 40px 24px;
    }

    /* ── FIELD LABEL ── */
    .field-label {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 6px;
    }

    /* ── INPUT ── */
    .input-wrap {
      position: relative;
      display: flex;
      align-items: center;
      background: rgba(255,255,255,0.06);
      border-radius: 8px;
      border: 1px solid var(--border);
      transition: border-color 0.15s;
    }

    .input-wrap:focus-within {
      border-color: rgba(59,141,255,0.5);
    }

    .input-wrap.is-invalid {
      border-color: rgba(255,82,82,0.6);
    }

    .input-icon {
      padding: 0 12px;
      color: var(--text-weak);
      font-size: 1.1rem;
      flex-shrink: 0;
      display: flex;
      align-items: center;
    }

    .form-input {
      flex: 1;
      background: transparent;
      border: none;
      outline: none;
      color: #fff;
      font-size: 0.95rem;
      padding: 14px 0;
      width: 100%;
    }

    .form-input::placeholder { color: var(--text-weak); }

    .input-action {
      padding: 0 12px;
      color: var(--text-weak);
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      background: none;
      border: none;
      transition: color 0.15s;
    }
    .input-action:hover { color: #fff; }

    .invalid-msg {
      font-size: 0.75rem;
      color: rgb(255,82,82);
      margin-top: 4px;
      display: none;
    }

    .input-wrap.is-invalid + .invalid-msg { display: block; }

    /* ── LOGIN BUTTON ── */
    .btn-login {
      width: 100%;
      height: 58px;
      border-radius: 8px;
      background: rgba(76,175,80,0.15);
      border: 1px solid rgba(76,175,80,0.35);
      color: rgb(76,175,80);
      font-size: 1rem;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
      transition: background 0.15s, filter 0.15s;
      text-decoration: none;
    }

    .btn-login:hover {
      background: rgba(76,175,80,0.25);
      color: rgb(76,175,80);
    }

    /* ── DIVIDER ── */
    .divider {
      border: none;
      border-top: 1px solid var(--border);
      margin: 24px 0;
    }

    /* ── REGISTER BUTTON ── */
    .btn-register {
      width: 100%;
      height: 58px;
      border-radius: 8px;
      background: rgba(33,150,243,0.15);
      border: 1px solid rgba(33,150,243,0.35);
      color: rgb(33,150,243);
      font-size: 1rem;
      font-weight: 900;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      transition: background 0.15s;
    }

    .btn-register:hover {
      background: rgba(33,150,243,0.25);
      color: rgb(33,150,243);
    }

    /* ── FOOTER ── */
    .site-footer {
      position: fixed;
      bottom: 0; left: 0; right: 0;
      background: var(--surface);
      border-top: 1px solid var(--border);
      padding: 14px 20px;
      z-index: 90;
    }

    .footer-text {
      font-size: 0.72rem;
      color: var(--text-weak);
      line-height: 1.6;
    }