:root {
            --primary: #7c3aed;
            --primary-dark: #6d28d9;
            --ios-bg: #f5f5f7;
            --ios-input-bg: #e8e8ed;
            --dark: #1d1d1f;
            --gray: #86868b;
            --white: #ffffff;
            --green: #34c759;
            --red: #ff3b30;

            --radius-app: 36px;
            --radius-btn: 20px;
            --radius-input: 18px;
            --spring: cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

        html, body { height: 100%; }

        body {
            font-family: 'Vazirmatn', -apple-system, sans-serif;
            background: var(--ios-bg);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .ios-container {
            background: var(--white);
            width: 100%;
            max-width: 440px;
            border-radius: var(--radius-app);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.04);
            padding: 45px 40px 50px;
            position: relative;
            text-align: center;
            transition: opacity 0.5s var(--spring), transform 0.5s var(--spring);
        }

        /* ---------- تب‌ها ---------- */
        .tabs {
            display: flex;
            background: var(--ios-input-bg);
            border-radius: 16px;
            padding: 5px;
            margin-bottom: 30px;
            position: relative;
        }

        .tab-btn {
            flex: 1;
            border: none;
            background: transparent;
            font-family: 'Vazirmatn', sans-serif;
            font-size: 1rem;
            font-weight: 700;
            color: var(--gray);
            padding: 13px 10px;
            border-radius: 12px;
            cursor: pointer;
            position: relative;
            z-index: 2;
            transition: color 0.35s var(--spring);
        }

        .tab-btn.active { color: var(--white); }

        .tab-indicator {
            position: absolute;
            top: 5px;
            bottom: 5px;
            width: calc(50% - 5px);
            right: 5px;
            background: var(--primary);
            border-radius: 12px;
            z-index: 1;
            transition: transform 0.4s var(--spring);
            box-shadow: 0 6px 15px rgba(124, 58, 237, 0.3);
        }

        .tab-indicator.to-register { transform: translateX(calc(-100% - 0px)); }

        /* ---------- مراحل / پنل‌ها ---------- */
        .panel { display: none; }
        .panel.active { display: block; animation: iosSlideUp 0.5s var(--spring) forwards; }

        .step-box { display: none; animation: iosSlideUp 0.5s var(--spring) forwards; }
        .step-box.active { display: block; }

        @keyframes iosSlideUp { from { opacity: 0; transform: translateY(20px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }

        .nav-bar { display: flex; align-items: center; justify-content: flex-start; margin-bottom: 25px; margin-top: -5px; }
        .back-btn { font-size: 1.05rem; color: var(--primary); cursor: pointer; padding: 8px; margin-right: -8px; display: flex; align-items: center; gap: 6px; font-weight: 700; border: none; background: none; font-family: inherit; }

        h2 { color: var(--dark); font-size: 1.55rem; font-weight: 800; margin-bottom: 10px; letter-spacing: -0.5px; }
        .subtitle { color: var(--gray); font-size: 0.92rem; margin-bottom: 28px; line-height: 1.7; }

        .input-group { position: relative; margin-bottom: 16px; text-align: right; }
        .input-group i.field-icon { position: absolute; right: 20px; top: 50%; transform: translateY(-50%); color: #a1a1a6; font-size: 1.15rem; transition: all 0.3s var(--spring); z-index: 2; pointer-events: none; }
        .ios-input { width: 100%; padding: 17px 20px; background: var(--ios-input-bg); border: 2px solid transparent; border-radius: var(--radius-input); font-family: 'Vazirmatn', sans-serif; font-size: 1.02rem; font-weight: 600; color: var(--dark); transition: all 0.3s var(--spring); outline: none; text-align: right; }
        .ios-input.center-ltr { text-align: center; direction: ltr; letter-spacing: 1px; padding-right: 20px; }
        .ios-input.has-icon { padding-right: 52px; }
        .ios-input::placeholder { color: #a1a1a6; font-weight: 500; letter-spacing: normal; }
        .input-group:focus-within .ios-input { background: var(--white); border-color: var(--primary); box-shadow: 0 8px 25px rgba(124, 58, 237, 0.12); }
        .input-group:focus-within i.field-icon { color: var(--primary); }
        .input-group.error .ios-input { border-color: var(--red); background: #fff5f5; }

        .toggle-pass {
            position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
            background: none; border: none; color: #a1a1a6; cursor: pointer; font-size: 1.05rem;
            padding: 4px; z-index: 2; transition: color 0.25s ease;
        }
        .toggle-pass:hover { color: var(--primary); }

        .field-hint { text-align: right; font-size: 0.78rem; color: var(--gray); margin: -8px 4px 16px; line-height: 1.6; }
        .field-hint.hint-error { color: var(--red); font-weight: 600; }

        .otp-inputs { display: flex; justify-content: space-between; gap: 10px; direction: ltr; margin: 40px 0 25px; }
        .otp-inputs input { flex: 1; min-width: 0; aspect-ratio: 1 / 1.1; text-align: center; font-size: 1.5rem; font-weight: 800; color: var(--dark); background: var(--ios-input-bg); border: 2px solid transparent; border-radius: 16px; outline: none; font-family: 'Vazirmatn', sans-serif; transition: all 0.3s var(--spring); }
        .otp-inputs input:focus { background: var(--white); border-color: var(--primary); box-shadow: 0 6px 20px rgba(124, 58, 237, 0.15); transform: scale(1.06) translateY(-2px); }
        .otp-inputs input.error { border-color: var(--red) !important; background: #fff5f5; color: var(--red); }

        .resend-row { text-align: center; margin-bottom: 10px; font-size: 0.88rem; color: var(--gray); }
        .resend-link { color: var(--primary); font-weight: 700; cursor: pointer; background: none; border: none; font-family: inherit; font-size: inherit; padding: 0; }
        .resend-link:disabled { color: var(--gray); cursor: not-allowed; font-weight: 600; }

        .btn-submit { width: 100%; background: var(--primary); color: var(--white); border: none; padding: 19px; border-radius: var(--radius-btn); font-size: 1.1rem; font-weight: 700; font-family: inherit; cursor: pointer; transition: all 0.3s var(--spring); margin-top: 10px; }
        .btn-submit:active { transform: scale(0.96); background: var(--primary-dark); }
        .btn-submit:disabled { opacity: 0.65; cursor: not-allowed; transform: none; }

        .switch-hint { margin-top: 22px; font-size: 0.9rem; color: var(--gray); }
        .switch-hint a { color: var(--primary); font-weight: 700; cursor: pointer; text-decoration: none; }
        
        .forgot-link {
            display: block;
            text-align: left;
            font-size: 0.85rem;
            color: var(--primary);
            font-weight: 600;
            margin-top: -8px;
            margin-bottom: 20px;
            cursor: pointer;
            text-decoration: none;
            padding-left: 4px;
            transition: opacity 0.2s;
        }
        .forgot-link:hover { opacity: 0.8; }

        /* نوتیفیکیشن کپسولی */
        .notification-toast { position: fixed; bottom: -100px; left: 50%; transform: translateX(-50%); background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); padding: 14px 26px; border-radius: 50px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); border: 1px solid rgba(0, 0, 0, 0.04); display: flex; align-items: center; justify-content: center; gap: 10px; transition: bottom 0.6s var(--spring); z-index: 1000; max-width: 90vw; }
        .notification-toast.show { bottom: 30px; }
        .notification-toast i { font-size: 1.35rem; flex-shrink: 0; }
        .notification-toast span { font-size: 1rem; font-weight: 700; color: var(--dark); font-family: 'Vazirmatn', -apple-system, sans-serif; }

        .toast-success i { color: var(--green); }
        .toast-error i { color: var(--red); }

        @media (max-width: 480px) {
            body { padding: 0; }
            .ios-container { border-radius: 0; min-height: 100vh; padding: 40px 22px 50px; box-shadow: none; display: flex; flex-direction: column; justify-content: center; }
            .otp-inputs { gap: 7px; margin: 34px 0 20px; }
            .otp-inputs input { border-radius: 13px; font-size: 1.3rem; }
            .notification-toast.show { bottom: 24px; }
            h2 { font-size: 1.4rem; }
        }

        @media (max-width: 340px) {
            .ios-input { padding: 15px 16px; font-size: 0.95rem; }
            .ios-input.has-icon { padding-right: 46px; }
        }