/* =========== AUTH SCREEN =========== */
    .auth-title {
      font-size: 28px; font-weight: 900; letter-spacing: 5px; text-transform: uppercase;
      text-align: center;
      margin-bottom: 4px;
      animation: authFadeUp 0.6s 0.15s cubic-bezier(0.34,1.56,0.64,1) both;
    }
    .auth-sub {
      font-size: 10px; color: var(--text3); margin-bottom: 36px;
      letter-spacing: 3px; text-transform: uppercase;
      animation: authFadeUp 0.6s 0.25s cubic-bezier(0.34,1.56,0.64,1) both;
    }
    @keyframes authFadeUp {
      0% { transform: translateY(12px); opacity: 0; }
      100% { transform: translateY(0); opacity: 1; }
    }
    .auth-form {
      width: 100%; max-width: 340px;
      background: var(--glass-bg);
      backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
      -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
      border-radius: var(--glass-radius);
      box-shadow: var(--glass-shadow);
      padding: 24px;
      animation: authFadeUp 0.6s 0.35s cubic-bezier(0.34,1.56,0.64,1) both;
    }
    .auth-form--static { animation: none; }
    .auth-field {
      position: relative; margin-bottom: 12px;
    }
    .auth-field-icon {
      position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
      width: 16px; height: 16px; stroke: var(--text3); stroke-width: 2; fill: none;
      stroke-linecap: round; stroke-linejoin: round;
      pointer-events: none; transition: stroke 0.2s;
    }
    .auth-field:focus-within .auth-field-icon { stroke: #7189a8; }
    .auth-input {
      width: 100%; background: var(--card); border: 1px solid var(--border);
      color: var(--text); font-family: inherit; font-size: 16px;
      padding: 14px 16px 14px 40px; border-radius: 10px;
      outline: none; transition: border-color 0.2s, box-shadow 0.2s;
    }
    .auth-input:focus {
      border-color: #7189a8;
      box-shadow: 0 0 0 3px rgba(113,137,168,0.15);
    }
    .auth-input::placeholder { color: var(--text3); }
    .auth-pass-toggle {
      position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
      background: none; border: none; cursor: pointer; padding: 4px;
      -webkit-tap-highlight-color: transparent;
    }
    .auth-pass-toggle svg {
      width: 18px; height: 18px; stroke: var(--text3); stroke-width: 2; fill: none;
      stroke-linecap: round; stroke-linejoin: round; transition: stroke 0.2s;
    }
    @media (hover: hover) { .auth-pass-toggle:hover svg { stroke: var(--text2); } }
    .auth-input[type="password"] ~ .auth-pass-toggle .eye-off { display: none; }
    .auth-input[type="text"] ~ .auth-pass-toggle .eye-on { display: none; }
    .auth-btn {
      width: 100%; padding: 15px; border: none; border-radius: 12px;
      background: linear-gradient(135deg, #34d399, #8b5cf6, #3b82f6, #34d399);
      background-size: 400% 400%;
      color: #fff; font-family: inherit;
      font-size: 14px; font-weight: 800; cursor: pointer;
      letter-spacing: 1.5px; text-transform: uppercase; margin-top: 4px;
      transition: transform 0.15s, box-shadow 0.2s;
      box-shadow: 0 4px 20px rgba(139,92,246,0.3); position: relative; overflow: hidden;
      animation: aurora 8s ease infinite;
    }
    @media (hover: hover) { .auth-btn:hover { box-shadow: 0 6px 24px rgba(139,92,246,0.4); } }
    .auth-btn:active { transform: scale(0.97); }
    .auth-divider {
      display: flex; align-items: center; gap: 12px; margin: 20px 0 16px;
    }
    .auth-divider::before, .auth-divider::after {
      content: ''; flex: 1; height: 1px; background: var(--border);
    }
    .auth-divider span { font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; }
    .auth-toggle {
      text-align: center; font-size: 13px; color: var(--text3);
    }
    .auth-toggle a {
      color: #7189a8; text-decoration: none; cursor: pointer;
      font-weight: 600; transition: opacity 0.2s;
    }
    @media (hover: hover) { .auth-toggle a:hover { opacity: 0.8; } }
    .auth-error {
      background: rgba(255,68,68,0.08); border: 1px solid rgba(255,68,68,0.25);
      color: var(--red); font-size: 14px; padding: 10px 14px; border-radius: 10px;
      margin-bottom: 12px; display: none;
    }
    .auth-screen {
      display: flex; flex-direction: column; align-items: center;
      min-height: 100dvh; padding: 24px 20px 48px;
    }
    /* ─── Auth: sistema de pasos multi-step ─── */
    .auth-step { display: none; width: 100%; flex-direction: column; align-items: center; }
    .auth-step.active { display: flex; animation: authFadeUp 0.32s cubic-bezier(0.34,1.56,0.64,1) both; }
    #authStepLogin { margin: auto 0; }
    .auth-step--welcome { padding-top: max(20px, 8vh); }
    .auth-back-btn {
      align-self: flex-start; display: flex; align-items: center; gap: 6px;
      color: var(--text3); font-size: 14px; cursor: pointer; margin-bottom: 18px;
      background: none; border: none; padding: 4px 0; font-family: inherit;
      -webkit-tap-highlight-color: transparent; transition: color 0.15s;
    }
    .auth-back-btn svg { width: 18px; height: 18px; stroke: currentColor; stroke-width: 2.5; fill: none; stroke-linecap: round; stroke-linejoin: round; }
    .auth-step-progress {
      align-self: flex-start; font-size: 11px; color: var(--text3);
      letter-spacing: 1px; text-transform: uppercase; margin-bottom: 16px; max-width: 340px; width: 100%;
    }
    .auth-step-title { font-size: 21px; font-weight: 900; margin: 0 0 6px; width: 100%; max-width: 340px; }
    .auth-step-sub { font-size: 13px; color: var(--text3); margin-bottom: 24px; width: 100%; max-width: 340px; line-height: 1.5; }
    /* Tipo de cuenta — cards */
    .reg-type-grid { width: 100%; max-width: 340px; display: flex; flex-direction: column; gap: 10px; }
    .reg-type-card {
      background: var(--glass-bg);
      backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
      -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
      border: 1.5px solid var(--border); border-radius: 16px; padding: 18px 20px;
      cursor: pointer; display: flex; align-items: center; gap: 16px;
      transition: border-color 0.2s, transform 0.12s; box-shadow: var(--glass-shadow);
      -webkit-tap-highlight-color: transparent;
    }
    .reg-type-card:active { transform: scale(0.97); }
    .reg-type-icon { font-size: 26px; flex-shrink: 0; }
    .reg-type-info h3 { font-size: 15px; font-weight: 700; margin: 0 0 3px; color: var(--text); }
    .reg-type-info p { font-size: 14px; color: var(--text3); margin: 0; line-height: 1.4; }
    /* Campos con label arriba */
    .reg-field { margin-bottom: 12px; }
    .reg-field--pass { position: relative; }
    .reg-field--pass .auth-pass-toggle { top: calc(50% + 11px); }
    .reg-label { display: block; font-size: 11px; font-weight: 700; color: var(--text3); letter-spacing: 0.8px; text-transform: uppercase; margin-bottom: 5px; padding-left: 2px; }
    .reg-input { padding-left: 16px !important; }
    .auth-fields-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; width: 100%; max-width: 340px; margin-bottom: 12px; }
    .auth-fields-row .reg-field { margin-bottom: 0; }
    /* Badge conectada */
    .reg-connected {
      display: flex; align-items: center; gap: 8px; width: 100%; max-width: 340px;
      background: rgba(52,211,153,0.1); border: 1px solid rgba(52,211,153,0.3);
      border-radius: 12px; padding: 12px 16px; margin-bottom: 20px;
      font-size: 13px; color: #34d399; font-weight: 600;
    }
    .reg-connected svg { width: 16px; height: 16px; stroke: #34d399; stroke-width: 2.5; fill: none; flex-shrink: 0; }
    /* Selector género videos */
    .reg-gender-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .reg-gender-opt {
      padding: 12px 8px; border: 1.5px solid var(--border); border-radius: 12px;
      cursor: pointer; text-align: center; font-size: 13px; font-family: inherit;
      background: var(--card); color: var(--text2); transition: all 0.15s;
      -webkit-tap-highlight-color: transparent;
    }
    .reg-gender-opt.sel { border-color: #8b5cf6; background: rgba(139,92,246,0.1); color: #8b5cf6; font-weight: 700; }
    /* Nota de pago futuro */
    .auth-note {
      font-size: 14px; color: var(--text3); text-align: center; margin-top: 14px;
      padding: 11px 14px; background: var(--card); border-radius: 10px;
      width: 100%; border: 1px solid var(--border); line-height: 1.5;
    }
    /* Botón secundario */
    .auth-btn-secondary {
      width: 100%; padding: 13px; border: 1.5px solid var(--border); border-radius: 12px;
      background: none; color: var(--text2); font-family: inherit;
      font-size: 13px; font-weight: 600; cursor: pointer;
      transition: border-color 0.2s, color 0.2s; -webkit-tap-highlight-color: transparent;
    }
    .auth-btn-secondary:active { border-color: var(--text2); }
    .auth-btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; }
    /* Pantalla de bienvenida */
    .auth-welcome-icon { margin-bottom: 16px; color: var(--green); }
    .auth-welcome-icon svg { width: 52px; height: 52px; display: block; }
    .auth-welcome-title { font-size: 24px; font-weight: 900; margin: 0 0 10px; text-align: center; }
    .auth-welcome-sub { font-size: 14px; color: var(--text3); text-align: center; line-height: 1.6; margin-bottom: 28px; max-width: 300px; }
    .auth-invite-code-box {
      width: 100%; max-width: 340px; margin-bottom: 24px;
      background: var(--glass-bg); border: 2px dashed var(--border);
      backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur));
      border-radius: 16px; padding: 20px; text-align: center;
    }
    .auth-invite-code-box .code-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
    .auth-invite-code-box .code-value { font-size: 28px; font-weight: 900; letter-spacing: 6px; }
    .auth-welcome-actions { display: flex; flex-direction: column; gap: 10px; width: 100%; max-width: 340px; }
    /* Input de código de invitación */
    .reg-invite-input {
      width: 100%; max-width: 340px; background: var(--card); border: 2px solid var(--border);
      color: var(--text); font-family: inherit; font-size: 22px; font-weight: 800;
      padding: 18px 20px; border-radius: 14px; text-align: center; letter-spacing: 4px;
      text-transform: uppercase; outline: none; transition: border-color 0.2s, box-shadow 0.2s; margin-bottom: 10px;
    }
    .reg-invite-input:focus { border-color: #7189a8; box-shadow: 0 0 0 3px rgba(113,137,168,0.15); }
    .reg-invite-input::placeholder { letter-spacing: 2px; font-size: 16px; font-weight: 400; color: var(--text3); }
    .reg-invite-hint { font-size: 14px; color: var(--text3); text-align: center; max-width: 300px; line-height: 1.5; margin-bottom: 20px; }
    .reg-invite-error { color: var(--red); font-size: 13px; text-align: center; display: none; margin-bottom: 12px; max-width: 340px; }
    /* Empty state alumno sin plan */
    .student-empty-card {
      background: var(--glass-bg); border: 1px solid var(--border);
      backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur));
      border-radius: 20px; padding: 28px 24px; text-align: center; margin: 12px 4px;
    }
    .student-empty-icon { font-size: 36px; margin-bottom: 12px; }
    .student-empty-title { font-size: 17px; font-weight: 800; margin-bottom: 8px; }
    .student-empty-body { font-size: 13px; color: var(--text3); line-height: 1.6; margin-bottom: 20px; }
    .student-empty-actions { display: flex; flex-direction: column; gap: 10px; }
    .student-empty-btn {
      padding: 14px 20px; border-radius: 12px; border: none;
      font-family: inherit; font-size: 13px; font-weight: 700; cursor: pointer;
      transition: opacity 0.2s, transform 0.12s; -webkit-tap-highlight-color: transparent;
    }
    .student-empty-btn.primary { background: linear-gradient(135deg, #34d399, #8b5cf6); color: #fff; }
    .student-empty-btn.secondary { background: var(--card); border: 1.5px solid var(--border); color: var(--text2); }
    .student-empty-btn:active { transform: scale(0.97); }

    /* Student request plan — selección de presets */
    .req-plan-wrap { padding: 4px 0 8px; }
    .req-plan-hero { text-align: center; padding: 20px 8px 18px; }
    .req-plan-badge { display: inline-block; font-size: 10px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--green); background: rgba(52,211,153,0.12); border-radius: 20px; padding: 3px 12px; margin-bottom: 14px; }
    .req-plan-title { font-size: 22px; font-weight: 800; color: var(--text); line-height: 1.2; margin-bottom: 10px; }
    .req-plan-body { font-size: 13px; color: var(--text3); line-height: 1.6; max-width: 290px; margin: 0 auto; }
    .req-plan-section-label { font-size: 11px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--text3); padding: 4px 2px 10px; }
    .req-plan-presets { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
    .req-preset-card { background: var(--card); border: 2px solid var(--border); border-radius: 14px; padding: 16px 18px; cursor: pointer; display: flex; align-items: center; gap: 14px; transition: border-color 0.18s, background 0.18s; -webkit-tap-highlight-color: transparent; }
    .req-preset-card.selected { border-color: var(--green); background: rgba(52,211,153,0.07); }
    .req-preset-radio { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--border); flex-shrink: 0; display: flex; align-items: center; justify-content: center; transition: border-color 0.18s, background 0.18s; }
    .req-preset-card.selected .req-preset-radio { border-color: var(--green); background: var(--green); }
    .req-preset-radio-dot { width: 8px; height: 8px; border-radius: 50%; background: #fff; opacity: 0; transition: opacity 0.18s; }
    .req-preset-card.selected .req-preset-radio-dot { opacity: 1; }
    .req-preset-info { flex: 1; }
    .req-preset-name { font-size: 14px; font-weight: 700; color: var(--text); }
    .req-preset-price { font-size: 22px; font-weight: 800; color: var(--text); margin-top: 2px; }
    .req-plan-submit { width: 100%; padding: 16px; border: none; border-radius: 14px; background: linear-gradient(135deg, #34d399, #8b5cf6); color: #fff; font-family: inherit; font-size: 15px; font-weight: 700; cursor: pointer; transition: opacity 0.2s, transform 0.12s; -webkit-tap-highlight-color: transparent; }
    .req-plan-submit:disabled { opacity: 0.45; cursor: default; }
    .req-plan-submit:active:not(:disabled) { transform: scale(0.98); }
    .req-plan-note { font-size: 11px; color: var(--text3); text-align: center; margin-top: 12px; line-height: 1.6; }
    .req-plan-back { display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600; color: var(--text3); cursor: pointer; padding: 8px 0 16px; -webkit-tap-highlight-color: transparent; }
    .req-plan-back-link { background: none; border: none; color: var(--text3); font-family: inherit; font-size: 14px; cursor: pointer; padding: 10px 0; display: block; margin: 0 auto; }
    .req-plan-back svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2.5; stroke-linecap: round; }
    .req-plan-notes { width: 100%; box-sizing: border-box; padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 12px; background: var(--card); color: var(--text); font-family: inherit; font-size: 13px; line-height: 1.6; resize: none; outline: none; transition: border-color 0.18s; margin-bottom: 20px; }
    .req-plan-notes:focus { border-color: var(--green); }
    .req-plan-notes::placeholder { color: var(--text3); }
    /* Pantalla de éxito post-pago */
    .payment-success-card { background: var(--glass-bg); border: 1px solid var(--border); backdrop-filter: blur(var(--glass-blur)); -webkit-backdrop-filter: blur(var(--glass-blur)); border-radius: 20px; padding: 32px 24px; text-align: center; margin: 16px 4px; }
    .payment-success-icon { width: 68px; height: 68px; border-radius: 50%; background: rgba(52,211,153,0.12); display: flex; align-items: center; justify-content: center; margin: 0 auto 18px; }
    .payment-success-icon svg { width: 34px; height: 34px; stroke: var(--green); fill: none; stroke-width: 1.5; stroke-linecap: round; }
    .payment-success-title { font-size: 22px; font-weight: 800; color: var(--text); margin-bottom: 10px; }
    .payment-success-body { font-size: 13px; color: var(--text2); line-height: 1.75; margin-bottom: 26px; }
    .payment-success-steps { text-align: left; display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
    .payment-success-step { display: flex; align-items: center; gap: 12px; }
    .pss-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--green); flex-shrink: 0; }
    .pss-dot.pending { background: transparent; border: 2px solid var(--border); }
    .pss-text { font-size: 13px; color: var(--text2); }
    .payment-success-step.done .pss-text { font-weight: 600; color: var(--green); }
    .payment-success-note { font-size: 14px; color: var(--text3); margin-bottom: 20px; line-height: 1.5; }
    .payment-success-actions { display: flex; flex-direction: column; gap: 10px; }